Classifications

• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/28—Treatment of water, waste water, or sewage by sorption
  • C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
  • B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
  • B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
  • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
  • B01J20/28004—Sorbent size or size distribution, e.g. particle size
  • B01J20/28007—Sorbent size or size distribution, e.g. particle size with size in the range 1-100 nanometers, e.g. nanosized particles, nanofibers, nanotubes, nanowires or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
  • B01J21/02—Boron or aluminium; Oxides or hydroxides thereof
  • B01J21/04—Alumina
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
  • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
  • B01J23/74—Iron group metals
  • B01J23/745—Iron
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
  • B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
  • B01J31/06—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
  • B01J37/02—Impregnation, coating or precipitation
  • B01J37/03—Precipitation; Co-precipitation
  • B01J37/031—Precipitation
  • B01J37/035—Precipitation on carriers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
  • B01J37/36—Biochemical methods
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B82—NANOTECHNOLOGY
  • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
  • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
  • C01B13/14—Methods for preparing oxides or hydroxides in general
  • C01B13/36—Methods for preparing oxides or hydroxides in general by precipitation reactions in aqueous solutions
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
  • C01F7/00—Compounds of aluminium
  • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
  • C01F7/34—Preparation of aluminium hydroxide by precipitation from solutions containing aluminium salts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2220/00—Aspects relating to sorbent materials
  • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
  • B01J2220/46—Materials comprising a mixture of inorganic and organic materials
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2002/00—Crystal-structural characteristics
  • C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
  • C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2002/00—Crystal-structural characteristics
  • C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
  • C01P2002/82—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by IR- or Raman-data
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2002/00—Crystal-structural characteristics
  • C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
  • C01P2002/85—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by XPS, EDX or EDAX data
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2004/00—Particle morphology
  • C01P2004/01—Particle morphology depicted by an image
  • C01P2004/04—Particle morphology depicted by an image obtained by TEM, STEM, STM or AFM
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2004/00—Particle morphology
  • C01P2004/60—Particles characterised by their size
  • C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/28—Treatment of water, waste water, or sewage by sorption
  • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/28—Treatment of water, waste water, or sewage by sorption
  • C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2101/00—Nature of the contaminant
  • C02F2101/10—Inorganic compounds
  • C02F2101/103—Arsenic compounds
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2101/00—Nature of the contaminant
  • C02F2101/10—Inorganic compounds
  • C02F2101/12—Halogens or halogen-containing compounds
  • C02F2101/14—Fluorine or fluorine-containing compounds
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2303/00—Specific treatment goals
  • C02F2303/04—Disinfection
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2305/00—Use of specific compounds during water treatment
  • C02F2305/08—Nanoparticles or nanotubes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P20/00—Technologies relating to chemical industry
  • Y02P20/10—Process efficiency
  • Y02P20/133—Renewable energy sources, e.g. sunlight
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]

Definitions

• the present disclosure relates to nanomaterials, and particularly to nanometal oxyhydroxide materials, such as, for example, organic templated nanometal oxyhydroxide materials, together with methods of preparing such materials.
• activated alumina is the most popular composition. Activated alumina is typically prepared by complete thermal dehydration of aluminum hydroxide whereas boehmite is typically prepared by partial thermal dehydration of aluminum hydroxide. Activated alumina is an effective industrial desiccant, catalyst support and an effective adsorbent of arsenic and fluoride in water. The United Nations
• UDP Environmental Program agency
• Aluminum based compounds in general, and alumina in particular, are widely used and are the basis of demonstrated technology for removing arsenic and fluoride from drinking water.
• the fluoride adsorption capacity of aluminum based compounds is typically very low, for example, on the order of 1 to 10 mg/g.
• Arsenic adsorption capacity is similarly low.
• adsorption technologies and devices which utilize conventional alumina materials are limited by the low arsenic and fluoride uptake capacity and can require frequent regeneration, producing large amounts of solid and liquid waste.
• granular beads of alumina are used in the applications discussed above. Powder based compositions cannot be directly used due to the inherent poor hydraulic conductivity and the danger of particle leaching.
• the conventional granular beads are prepared by adding binders along with fine particles of alumina/aluminum hydroxide, and heating the mixture at elevated temperatures in the range of 300 °C to 600 °C.
• Yet another method for obtaining alumina beads is via an oil-drop method wherein a gel obtained by precipitation of an aluminum precursor is allowed to drop into a hot oil bath, forming spherical particles and ageing the particles at higher pressure and temperature. The resulting crystalline spherical alumina particles are obtained after washing, drying and calcining at high temperature. Due to the use of external physical and/or chemical agents, such approaches are lesser environment friendly and uneconomical.
• Metal oxide-chitosan composite materials are one example of organic bio-based materials known for their adsorption capacity to remove, for example, various aquatic pollutants.
• Ti-Al supported chitosan beads have recently been examined for the removal of fluoride, wherei it was found that chitosan beads dried at 80 °C swell in water and clog the filter unit. Calcining the beads at elevated temperature (e.g., 450 °C) can improve the stability of the beads; however, the calcination process reduces the fluoride uptake capacity and can decompose chitosan. These constraints restrict the use of such media for water purification applications.
• this disclosure in one aspect, relates to a granular composite material, and specifically to a granular composite of organic templated nanometal oxyhydroxide/hydroxide/oxide, and methods for preparing such materials.
• the present disclosure provides a method for preparing a granular composite of organic templated nanometal-oxyhydroxide/hydroxide/oxide.
• the present disclosure provides a method for preparing a granular composite through an aqueous route comprising a biopolymer and one or more nanometal- oxyhydroxide/hydroxide/oxide particles .
• the methods of the present disclosure can obviate the need for elevated temperatures, pressure or external chemical agents in the preparation of granular composite materials.
• the present disclosure provides a filtration device comprising the inventive nanometal oxyhydroxide/hydroxide/oxide material.
• FIG. 1 is a schematic representation of chemical reactions involved in the method for preparation of a granular hybrid composite, in accordance with various aspects of the present invention.
• FIG. 2 is a schematic representation of chitosan bound AIOOH particles, in accordance with an embodiment of the present invention, together with micrographs illustrating the pepper corn like shape of the particles.
• FIG. 3a illustrates X-ray diffraction (XRD) patterns of an organic template boehmite nanoarchitecture (OTBN), fluoride adsorbed OTBN and chitosan.
• FIG. 3b illustrates the XRD patterns of OTBN prepared by various starting materials and OTBN dried by various methods.
• XRD X-ray diffraction
• FIG. 4 illustrates FT-IR spectra of organic template boehmite nanoarchitecture (OTBN) and fluoride adsorbed OTBN.
• FIG. 5a illustrates the x-ray photoelectron spectroscopy (XPS) spectra of organic template boehmite nanostructure (OTBN) before and after the adsorption of the fluoride, with FIGS 5b, 5c, and 5d detailing the aluminum, oxygen, and fluorine regions, repsectively.
• FIG. 6a illustrates the extent of fluoride adsorption by OTBN as a function of adsorbent dose
• FIG. 6b illustrates the fluoride uptake capacity as a function initial fluoride concentration at an initial fluoride concentration of 10 mg/L and feed water pH of 7 + 0.2.
• FIG. 7a illustrates fluoride uptake capacity of OTBN as a function of time
• FIG. 7b depicts pseudo-second order kinetic plots for the adsorption of fluoride onto OTBN.
• FIG. 8a illustrates adsorption capacity of OTBN as a function of adsorbent dose
• FIG. 8b illustrates adsorption capacity of OTBN as function of arsenate concentration at an initial arsenate concentration of 1.1 mg/L and feed water pH of 7 + 0.2.
• Ranges can be expressed herein as from “about” one particular value, and/or to "about” another particular value. When such a range is expressed, another aspect includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent "about,” it will be understood that the particular value forms another aspect. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint. It is also understood that there are a number of values disclosed herein, and that each value is also herein disclosed as "about” that particular value in addition to the value itself. For example, if the value “10” is disclosed, then “about 10" is also disclosed. It is also understood that each unit between two particular units are also disclosed. For example, if 10 and 15 are disclosed, then 11, 12, 13, and 14 are also disclosed.
• oxyhydroxide/hydroxide/oxide can refer to an
• oxyhydroxide a hydroxide, an oxide, or any combination thereof. It is not necessary that each of an oxyhydroxide, a hydroxide, and an oxide be present.
• compositions of the invention Disclosed are the components to be used to prepare the compositions of the invention as well as the compositions themselves to be used within the methods disclosed herein.
• compositions disclosed herein have certain functions.
• the present disclosure relates generally to a granular composite material.
• the invention comprises a granular composite of an organic templated nanometal oxyhydroxide/hydroxide/oxide material.
• such a granular composite can be prepared using a process conducted at least partially in an aqueous medium.
• the present disclosure provides methods for the preparation of a granular composite, such as, for example, an organic templated nanometal
• the present disclosure provides methods for preparing a granular composition using an aqueous medium, the method comprising a biopolymer and one or more nanometal oxyhydroxide/hydroxide/oxide particles.
• the methods of the present invention comprise contacting a metal or metal precursor with a biopolymer and/or biopolymer solution, and then contacting the resulting mixture with a base.
• a metal and/or metal precursor can comprise a salt of a metal or a solution thereof.
• the metal from which a metal and/or metal precursor can comprise aluminum, zinc, manganese, iron, titanium, zirconium, lanthanum, cerium, or a combination thereof.
• a metal precursor comprises a solution of an aluminum salt comprising aluminum nitrate, aluminum chloride, aluminum sulfate, aluminum isopropoxide, or a combination thereof.
• the metal precursor can comprise other metal salts or solutions not specifically recited herein, and the present invention is not intended to be limited to any particular metal precursor.
• the metal precursor can comprise a mixture of two or more individual metal precursors in any desired ratio, such as, for example, from about 20: 1 to about 1:20, for example, about 20: 1, 10: 1, 5: 1, 3: 1, 2: 1, 1: 1, 1:2, 1:3, 1:5, 1: 10, or 1:20.
• the metal precursor comprises aluminum nitrate.
• the metal precursor comprises a mixture of aluminum and iron salts in a ratio of, for example, about 3: 1 (Al:Fe).
• the biopolymer can comprise any suitable biopolymer or mixture of biopolymers.
• the biopolymer can comprise chitosan, banana silk, cellulose fibers, or a combination thereof.
• the biopolymer or a portion thereof is a flake biopolymer.
• functionalized forms of the biopolymer can also be used as biopolymer flakes.
• chitosan flakes can be used as biopolymer flakes.
• a biopolymer such as, for example, a biopolymer flake
• a solution of water and/or a solution of water and a mineral acid such as, for example, HCl, HNO 3 and the like.
• the H + ions of the mineral acid can at least partially ionize the biopolymer and dissolve it in the water to obtain biopolymer solution.
• the biopolymer comprises chitosan.
• the biopolymer comprises a mixture of cellulose and chitosan.
• the metal ions of a metal precursor can interact with a biopolymer through a number of functional groups.
• the amounts of metal precursor and biopolymer can vary, and any suitable amount for a desired composite can be utilized.
• the base of the present invention can comprise any suitable base for use in preparing the inventive granular composites.
• a base can comprise sodium hydroxide, ammonia, potassium hydroxide, or a combination thereof.
• other bases or combination of bases and/or solutions thereof can be used, and the present invention is not intended to be limited to any particular base.
• metal ions present in the resulting metal- biopolymer complex solution can hydrolyze and precipitate as nanometal
• oxyhydroxide/hydroxide/oxide particles oxyhydroxide/hydroxide/oxide particles.
• functional groups associated with a biopolymer such as chitosan, can enable the formation of metal- oxyhydroxide/hydroxide/oxide, for example, a combination of oxyhydroxide, hydroxide, and oxide, rather than metal hydroxide.
• a semi-solid precipitate comprising nanometal- oxyhydroxide/hydroxide/oxide particles aligned on the chitosan biopolymer can be obtained.
• the size of the resulting nanometal oxyhydroxide/hydroxide/oxide particles can be in the range of from about 1 nm to about 100 nm.
• the size of the nanometal oxyhydroxide/hydroxide/oxide particles can be in the range of from about 3 nm to about 10 nm.
• the method for preparing the inventive granular composite can be conducted at least partially in an aqueous medium. In another aspect, the method can be conducted in an aqueous medium.
• the phrase 'an aqueous medium' can refer to a medium comprising water, and optionally other aqueous and/or nonaqueous components. In another aspect, the phrase 'an aqueous medium' can refer to a medium wherein all components are aqueous or at least partially soluble in water.
• other items, such as particulate materials, that can form, for example, a suspension can be present.
• the method can be conducted wherein the temperature of the medium is below about 60 °C for at least a portion of the process. In another aspect, the method can be conducted wherein the temperature of the medium is below about 60 °C during the process.
• a metal precursor can be contacted with a biopolymer.
• the metal precursor or a portion thereof can be in the form of a solution.
• the metal precursor and biopolymer can form a metal-biopolymer complex solution.
• such a complex solution can be subjected to a hydrolysis step wherein the metal precursor or a portion thereof is hydrolyzed by contacted with a base.
• the base can comprise a solution.
• the order of contacting can vary.
• the biopolymer can metal precursor are first contacted, and then the resulting mixture can be contacted with a base or base solution.
• the degree of mixing can vary, and it is not necessary that the components be thoroughly mixed or that a completely homogeneous mixture be obtained.
• the components are mixed such that the resulting composition is uniform or substantially uniform.
• the components can be vigorously mixed, for example, by stirring, to obtain the desired product.
• the resulting product can comprise one or more nanometal oxyhydroxiee/hydroxide/oxide particles.
• any of the one or more particles can comprise the same or a different chemical composition and/or structure than any other particles.
• a precipitate such as, for example, a semi-solid precipitate of the one or more nanometal oxyhydroxide/hydroxide/oxide particle-biopolymer composite
• the semi-solid precipitate can be subjected to optional filtration and/or drying steps to remove impurities, concentrate the precipitate, and isolate the desired solid nanometal oxyhydroxide/hydroxide/oxide particle-biopolymer composite.
• a solid composite produced from the methods described herein can be ground to obtain a granular composite having a particle size and/or particle size
• the methods of the present invention do not require at least one of elevated temperature, elevated pressure, and/or external chemical agents to prepare a granular composite.
• the methods of the present invention do not require elevated temperature, pressure, or external chemical agents to prepare a granular composite.
• the inventive methods provide substantial improvements over conventional methods known in the art.
• the inventive granular composite includes a biopolymer as a component, the method for preparing the composite can be easy, economical, and environment friendly, especially as compared to conventional methods.
• the present invention provides methods for preparing granular composites of one or more organic templated nanometal-oxyhydroxide/hydroxide/oxide via an aqueous process.
• the inventive granular composites can have useful adsorption properties and can be used to remove, for example, fluoride and/or arsenic contaminants from water.
• FIG. 1 illustrates an exemplary reaction 100 through which a granular composite of organic templated nanometal-oxyhydroxide/hydroxide/oxide can be obtained.
• Reaction 100 can be initiated by preparing a biopolymer solution 102 of, for example, a biopolymer flake 101, and then a metal precursor solution 103 can be added to the biopolymer solution 102 to obtain a metal-biopolymer complex solution 105.
• a base 104 can then be added to the metal- biopolymer complex solution 105 to obtain the composite 106 of biopolymer and nanometal- oxyhydroxide/hydroxide/oxide particles .
• the resulting semi-solid precipitate can be filtered and/or dried to remove impurities, to concentrate the precipitate and to obtain a solid metal
• oxyhydroxide/hydroxide/oxide particle-biopolymer composite The particular method of drying, if dried, can vary, and the present invention is note intended to be limited to any particular drying method.
• exemplary drying methods can comprise freeze drying, surface drying, hot air drying, spray drying, vacuum drying, or a combination thereof.
• other drying technologies known in the art can be used in addition to or in lieu of any other specifically recited methods.
• the dried solid precipitate can optionally be ground to a desirable size for an intended application, for example, in the range of from about 0.1 mm to about 3 mm.
• the resulting granular composite can comprise the metal oxyhydroxide/hydroxide/oxide particles and the biopolymer.
• the resulting granular composite can consist of the metal oxyhydroxide/hydroxide/oxide particles and the biopolymer.
• a metal oxyhydroxide such as, for example, aluminum oxyhydroxide, commonly known as boehmite, can be prepared, wherein the granular composite obtained has an organic template boehmite nanoarchitecture (OTBN).
• the reaction 100 can take place at a temperature below about 60 °C, for example, about 55, 50, 45, 40, 35, 30, or 25 °C. In another aspect, the reaction 100 can take place at a temperature of about 30 °C.
• the inventive methods described herein can provide easy, economical, and environment friendly methods to prepare composites of organic templated nanometal- oxyhydroxide/hydroxide/oxide .
• FIG. 2 illustrates an exemplary schematic representation of OTBN comprising chitosan bound aluminum oxyhydroxide particles prepared by the methods of the present invention.
• one or more nanoscale aluminum oxyhydroxide particles 202 can be aligned on the surface of chitosan 201.
• Transmission electron micrographs 203 illustrate the OTBN at various magnifications.
• the OTBN samples can exhibit nano-whisker morpholigies.
• small particles can be attached to the fibrils, where the attached small particles resemble peppercorns.
• the fibrils can be organic templates and the particles can comprise AIOOH nanoparticles.
• the particles can have nanosize dimensions with diameters of, for example, less than about 5 nm.
• OTDBN organic templated boehmite nanoarchitecture
• XRD x-ray powder diffraction
• FTIR Fourier transform infrared
• XPS x-ray photoelectron spectroscopy
• FIG. 3 illustrates the XRD patterns of (A) an exemplary as-synthesized material reacted with 1000 mg/L fluoride; (B) as-synthesized material reacted with 100 mg/L fluoride (C) as- synthesized AIOOH; and (D) chitosan. Dotted lines correspond to the standard reflections of AIOOH. The traces are shifted vertically for clarity. (Label: '+' - chitosan; '*'- AIOOH). The as-synthesized samples showed peaks corresponding to (020), (120), (013), (200) and (231) and (251) planes (FIG. 3A).
• the current synthesis method can yield crystalline nanoscale- AIOOH having good green strength at much lower temperature in comparison to conventional methods.
• AIOOH formation is possible only above 373 K, and the prior art syntheses of nanoscale- AIOOH have been done in hydrothermal conditions at temperatures above 373 K.
• XRD patterns of the OTBNs prepared at various physical and chemical conditions were recorded in order to understand their effects on crystal structure of OTBN. Some of the XRD patterns recorded are shown in FIG. 3b. FIG.
• 3b illustrates the XRD patterns of as- synthesized materials through various starting materials: (Al) OTBN prepared using aluminum nitrate and ammonia as the starting materials, (A2) OTBN prepared using aluminum sulfate and ammonia as the starting materials, (A3) OTBN prepared using aluminum nitrate and sodium hydroxide as the starting materials, (A4 to A6) OTBN prepared using aluminum chloride and NaOH as the starting materials. All the materials except A5 and A6 were dried at 60 degree centigrade in oven. A5 was dried at room temperature and A6 was dried at 120 degree centigrade in oven. The data shows the formation of AIOOH with all the aluminum precursors and temperature range (25 to 130 degree centigrade) studied. The crystallographic structures obtained were seemingly identical.
• FIG. 4 illustrates FT-IR spectra of (A) the as- synthesized OTBN and (B) fluoride adsorbed OTBN. All the absorption bands are consistent with literature values and give additional evidence for the formation of ⁇ - AIOOH.
• the bands at 1072 and 1154 cm -1 are assigned to the symmetric and asymmetric stretching frequencies of Al-O-H of boehmite, respectively.
• the bands at 3096 and 3312 cm -1 are assigned to Al-OOH stretching vibrations.
• the band at 1636 cm -1 is assigned to the bending modes of adsorbed water and the broad band at 3429 cm -1 is due to the O-H stretching mode of adsorbed water.
• FIG. 5 illustrates the X-ray photoelectron spectroscopy (XPS) survey spectra of OTBN before and after the adsorption of the fluoride.
• Trace (A) and (B) in the FIG. 5(a-d) represent as-prepared OTBN and fluoride adsorbed OTBN respectively.
• FIG. 5(a) shows the survey spectra and (b,c,d) show the spectra of various regions of interest.These spectra confirm the existence of adsorbed fluoride along with the key elements aluminum and oxygen.
• the granular composite of organic templated nanometal- oxyhydroxide prepared by the methods of the present invention can exhibit fluoride, arsenic and/or pathogen adsorption capability from water.
• a granular composite can have a fluoride adsorption capacity in excess of about 50 mg/g at an initial fluoride concentration of about 10 mg/1, and/or have an arsenic adsorption capacity in excess of about 19 mg/g at an initial arsenate concentration of about 1.0 mg/1.
• FIG. 6a illustrates the extent of fluoride adsorption by OTBN as a function of adsorbent dose.
• the working volume of the contaminated water was taken to be 100 ml and the quantity of adsorbent dose is varied between 2.5 mg to 100 mg.
• the OTBN prepared through various starting materials were also tested to assess their capability to remove fluoride.
• the amount of fluoride adsorbed increased with increase in material dose from about 2.5 mg to about 50.0 mg and became more or less constant for further increase in dose.
• the fluoride concentration reduced to a value as low as about 0.5 mg/L from an initial concentration of about 10 mg/L at optimum adsorbent dose.
• FIG. 6b illustrates the fluoride uptake capacity as a function of initial fluoride concentration.
• the working volume of the contaminated water was taken to be 100 ml and the initial fluoride concentration was varied between 5-60 mg/L.
• FIG. 7a illustrates fluoride uptake capacity of OTBN as a function of time. The working volume of the contaminated water was taken to be 100 ml and quantity of adsorbent used is 50 mg.
• results show that fluoride uptake with OTBN sample prepared using the method of present invention is very fast and most of the removal takes place in the first 10 minutes of contact and the equilibrium is reached in 60 min.
• the fluoride uptake kinetics observed in the case of OTBN is much superior to the commercially available alumina and many other adsorbents used for scavenging fluoride, which has large implications in practical applications.
• FIG. 8a illustrates the extent of arsenic adsorption by OTBN as a function of adsorbent dose.
• OTBN dose was varied over a range of 5 to 100 mg.
• the working volume of the contaminated water was taken to be 100 ml.
• Studies were conducted with an initial arsenic concentration of about 1.1 mg/L and at pH of 7 + 0.2.
• the OTBN 25 mg
• ICP-OES inductively coupled plasma
• an equilibrium adsorption study of arsenic by OTBN was carried out at 30 + 2 °C and neutral pH.
• the initial arsenic concentrations were varied over a wide range (5 - 100 mg/L).
• the working volume of the contaminated water was taken to be 100 ml.
• the results obtained from this study are shown in FIG. 8b.
• the uptake capacity increased with increase in arsenic concentrations.
• An adsorption capacity of 183 mg/g is observed at initial arsenic concentration of 100 mg/L. This shows that the OTBN prepared using the method of the present invention has high affinity to arsenic and is better than any other aluminum based material reported for arsenic removal at similar equilibrium concentrations studied.
• the present invention provides methods for using a granular composite, such as, for example, to remove at least a portion of fluoride and/or arsenic that can be present in a water source.
• a granular composite such as, for example, to remove at least a portion of fluoride and/or arsenic that can be present in a water source.
• the present invention can serve as an adsorption media in a water purification technology, such as, for example, a water filter.
• the inventive granular composite can reduce the concentration of fluoride, arsenic, pathogens, and/or other contaminants in a water source.
• This example describes low temperature synthesis of nanoscale- ⁇ through a simple soft chemistry route.
• the synthesis procedure comprises mixing an aluminum precursor solution with chitosan (dissolved in 1 - 5 % glacial acetic acid or HC1 or combination thereof) with vigorous stirring.
• a solution of aluminum precursor such as aluminum nitrate was added slowly into the chitosan solution with vigorous stirring for 60 minutes and was kept overnight without agitation.
• Aqueous ammonia or NaOH solution was slowly added into the metal-chitosan solution with vigorous stirring to facilitate the precipitation of the metal-chitosan composites (pH 7 - 8.0). All these steps were carried out at temperature below 30 °C. Stirring was continued for two hours. The precipitate was filtered, washed to remove any unwanted impurities, converted in the shape of beads and dried at various conditions.
• This example describes the use of other biopolymers for the preparation of OTBN through a simple soft chemistry route.
• the synthesis procedure comprises mixing the aluminum precursor solution with cellulose with vigorous stirring.
• a solution of aluminum precursor such as aluminum nitrate was added slowly into the polymer solution with vigorous stirring for 60 minutes and was kept overnight without agitation.
• Aqueous ammonia or NaOH solution was slowly added into the metal-cellulose solution with vigorous stirring to facilitate the precipitation of the metal-cellulose composites (pH 7 - 8.0). All these steps were carried out at temperature below 30 °C. Stirring was continued for two hours. The precipitate was filtered, washed to remove any unwanted impurities, converted in the shape of beads and dried at various conditions.
• This example describes the use of a mixture of biopolymers for the preparation of OTBN through a simple soft chemistry route.
• the biopolymers used for the study are chitosan and cellulose.
• Cellulose powder was added to the chitosan solution (chitosan dissolved in 1% acetic acid). The weight ratio of chitosan to cellulose is 1: 1.
• aluminum nitrate solution was added slowly into the biopolymer solution with vigorous stirring for 60 minutes and was kept overnight without agitation.
• Aqueous ammonia or NaOH solution was slowly added into the metal-chitosan solution with vigorous stirring to facilitate the precipitation of the metal-cellulose-chitosan composites (pH 7 - 8.0). All these steps were carried out at temperature below 30 °C. Stirring was continued for two hours. The precipitate was filtered, washed to remove any unwanted impurities, converted in the shape of beads and dried at various conditions.
• This example describes the low temperature synthesis of metal ion doped nanoscale- AIOOH through a simple soft chemistry route.
• a mixture of aluminum nitrate and ferric nitrate is prepared in the molar ratio of 3: 1 (Al:Fe).
• the mixture is then slowly added into the chitosan solution (prepared in 1-5% nitric acid) with vigorous stirring for 60 minutes and was kept overnight without agitation.
• Aqueous ammonia or NaOH solution was slowly added into the metal-chitosan solution with vigorous stirring to facilitate the precipitation of the metal- chitosan composites (pH 7 - 8.0). All these steps were carried out at temperature below 30 °C. Stirring was continued for two hours.
• the precipitate was filtered, washed to remove any unwanted impurities, converted in the shape of beads and dried at various conditions.
• This example describes the variation in the size of nanoscale- ⁇ by varying the ratio of Akchitosan.
• the quantity of chitosan in the OTBN is increased to 40%.
• the presence of higher quantity of chitosan helps in further reducing the size of the nanoscale- ⁇ .
• a solution of aluminum precursor such as aluminum nitrate was added slowly into the chitosan solution with vigorous stirring for 60 minutes and was kept overnight without agitation.
• Aqueous ammonia or NaOH solution was slowly added into the metal-chitosan solution with vigorous stirring to facilitate the precipitation of the metal-chitosan composites (pH 7 - 8.0). All these steps were carried out at temperature below 30 °C. Stirring was continued for two hours. The precipitate was filtered, washed to remove any unwanted impurities, converted in the shape of beads and dried under various conditions.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Materials Engineering (AREA)
• Inorganic Chemistry (AREA)
• Analytical Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Nanotechnology (AREA)
• Crystallography & Structural Chemistry (AREA)
• Hydrology & Water Resources (AREA)
• Water Supply & Treatment (AREA)
• Environmental & Geological Engineering (AREA)
• General Physics & Mathematics (AREA)
• Condensed Matter Physics & Semiconductors (AREA)
• Composite Materials (AREA)
• Physics & Mathematics (AREA)
• Geology (AREA)
• Biochemistry (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)
• Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
• Catalysts (AREA)
• Compounds Of Iron (AREA)
• Inorganic Compounds Of Heavy Metals (AREA)
• Oxygen, Ozone, And Oxides In General (AREA)
• Silicon Compounds (AREA)
• Filtering Materials (AREA)
• Biological Treatment Of Waste Water (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (2)

Family

ID=45067144

Family Applications (1)

Country Status (7)

Cited By (4)

Families Citing this family (10)

Family Cites Families (14)

• 2011
  • 2011-06-02 US US13/701,561 patent/US20130168320A1/en not_active Abandoned
  • 2011-06-02 WO PCT/IB2011/001551 patent/WO2011151725A2/en not_active Ceased
  • 2011-06-02 SG SG10201504247YA patent/SG10201504247YA/en unknown
  • 2011-06-02 SG SG2012088472A patent/SG186126A1/en unknown
  • 2011-06-02 JP JP2013513004A patent/JP5908462B2/ja not_active Expired - Fee Related
  • 2011-06-02 IN IN1529CH2010 patent/IN2010CH01529A/en unknown
  • 2011-06-02 CN CN2011800375609A patent/CN103179861A/zh active Pending
• 2012
  • 2012-12-02 IL IL223388A patent/IL223388B/en not_active IP Right Cessation

Also Published As

Similar Documents

Legal Events