CN111715179A - Water purification composition, preparation method and application thereof - Google Patents
Water purification composition, preparation method and application thereof Download PDFInfo
- Publication number
- CN111715179A CN111715179A CN201910216855.0A CN201910216855A CN111715179A CN 111715179 A CN111715179 A CN 111715179A CN 201910216855 A CN201910216855 A CN 201910216855A CN 111715179 A CN111715179 A CN 111715179A
- Authority
- CN
- China
- Prior art keywords
- water purification
- purification composition
- adsorbent
- oxyhydroxide
- combinations
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Images
Classifications
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- 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
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
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- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
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- 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
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- 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
- C02F2101/20—Heavy metals or heavy metal compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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Abstract
The invention provides a water purification composition, a preparation method and application thereof. The water purification composition comprises a heavy metal ion adsorbent and a binder, wherein the binder is selected from thermoplastic elastomers. The water purification adsorbent has the advantages of simple preparation process, high mechanical strength, high adsorption efficiency, large adsorption capacity and the like. The water purification composition according to the present invention can be effectively used for removing heavy metal ions from drinking water.
Description
Technical Field
The present invention relates to the field of water purification. Specifically, the invention relates to a water purification composition, a preparation method and an application thereof.
Background
Water pollution is a ubiquitous problem worldwide. Human activity emissions, industrial emissions and natural factors cause water to be contaminated with heavy metal ions, with arsenic (As), cadmium (Cd), lead (Pb), mercury (Hg) contamination being particularly harmful. Heavy metal contamination of drinking water can cause serious health problems and even threaten life safety. For example, arsenic contamination of drinking water can lead to normal body dysfunction and various pathologies. In order to ensure the safety of drinking water, the concentration limit values of heavy metal ions in different water environments are strictly regulated in a standard form in China. For example, the sanitary Standard for Drinking Water (GB5479-2006) of China stipulates that arsenic is less than or equal to 0.01mg/L, cadmium is less than or equal to 0.005mg/L, lead is less than or equal to 0.01mg/L and mercury is less than or equal to 0.001mg/L in drinking water.
The removal of heavy metal ions in water is always a hotspot and a difficult point of domestic and foreign research. Numerous methods have been developed to remove heavy metal ions from water, including adsorption, flocculation-precipitation, ion exchange, reverse osmosis, and the like. Among them, the adsorption method is widely used in a water purification process, particularly a drinking water purification process, because of its simple process flow, good treatment effect, and low operation cost.
The adsorption method generally involves using a solid material with a high specific surface area as an adsorbent, and adsorbing heavy metal ions in water on the surface of the adsorbent through chemical adsorption, physical adsorption and the like, so as to remove heavy metals. Commonly used adsorbents include carbonaceous adsorbents such as activated carbon; mineral adsorbents such as metal oxides/hydroxides and zeolites; and other types of adsorbents such as high molecular weight polymers. In the preparation of the adsorbent, a binder is usually added to bind the active adsorbent material to obtain adsorbent particles of a suitable size. Common binders such as clay, sodium silicate, silica/alumina sol, thermoplastic polymers such as polyethylene, polypropylene, and the like.
CN101898058B discloses a preparation method of a low-temperature sintered attapulgite-based direct drinking water filter material, which comprises the steps of compounding attapulgite with a non-metal material, adding a binder, namely water glass, stirring, granulating, then sintering at a low temperature, and finally performing surface alkaline modification to obtain a finished product. The addition of the binder, namely the water glass, can effectively reduce the sintering temperature on the basis of keeping the strength of the particles.
CN107159100A discloses a ferro-manganese modified natural mineral composite material for removing arsenic, which is prepared by taking natural minerals as a matrix, ball-milling and mixing the natural minerals with ferric salt, manganese salt, a dispersing agent and a binder, adding water and kneading, carrying out vacuum pugging, carrying out extrusion molding, drying and roasting. Wherein the binder is selected from one or more of citric acid gypsum, sodium carboxymethylcellulose and alginic acid.
CN104039711B discloses a magnesium oxide containing water purification composition comprising a magnesium oxide component and a binder, wherein the binder is selected from polymeric binders such as polymethylmethacrylate and polyethylene, calcium aluminium silicate and combinations thereof. It is believed that the addition of the binder enables the selection of parameters that optimize arsenic and fluoride adsorption while preventing the formation of a paste or slurry when the magnesium oxide is contacted with water.
The addition of binders meets the size requirements of the adsorbent, but binders such as clays and silicates generally require high temperature processing or long processing times to achieve strength. Furthermore, thermoplastic polymer binders, such as polyethylene, will result in relatively brittle sorbent particles due to their limited toughness.
Therefore, there is a need for a water purification adsorbent for removing heavy metal ions from water, especially drinking water, more effectively, which has the combined advantages of simple preparation process, high mechanical strength, good adsorption efficiency, and less tendency for the active components of the adsorbent to fall off and block the water filtration container.
Disclosure of Invention
In view of the above, the present invention provides a water purification composition that effectively solves or at least alleviates one or more of the above problems and other problems of the prior art.
According to one aspect of the present invention, there is provided a water purification composition comprising a heavy metal ion adsorbent and a binder, wherein the binder is selected from thermoplastic elastomers.
In some embodiments, the adhesive is selected from the group consisting of polypropylene elastomers, poly-1, 2-butadiene, ethylene-propylene-diene monomer, ethylene-octene copolymers, styrene-butadiene-styrene block copolymers, ethylene-vinyl acetate copolymers, ethylene-methyl acrylate-glycidyl methacrylate copolymers, and combinations thereof.
In some embodiments, the adsorbent is selected from the group consisting of metal oxide materials, oxyhydroxide materials, zeolite materials, and combinations thereof.
In some embodiments, the adsorbent is present in an amount of 80 to 95 wt.%, based on the total weight of the water purification composition.
According to another aspect of the present invention, there is provided a method for preparing the above water purification composition, comprising performing the steps of:
step 1: uniformly mixing an adsorbent, a binder and an optional porogen;
step 2: extruding the mixture obtained in the step 1 through an extruder to obtain an extrudate; and optionally (c) a second set of instructions,
and step 3: treating the extrudate obtained in step 2 to obtain a particulate water purification composition of reduced size.
In some embodiments, the method further comprises the step of sieving the extrudate or particles after step 2, or, if step 3 is present, after step 3.
In some embodiments, step 1 consists in uniformly mixing the adsorbent and binder with a porogen selected from the group consisting of low molecular weight polyethylene glycol, glycerol, propylene glycol, butylene glycol, dimethylformamide, and combinations thereof. The content of the pore-foaming agent is 5-40 wt% based on the total weight of the adsorbent.
In the case of using a porogen, the method may further comprise the step of removing the porogen.
According to a further aspect of the present invention, there is provided the use of the water purification composition described above for removing heavy metal ions from water.
In some embodiments, the heavy metal ions are selected from the group consisting of arsenic ions, lead ions, mercury ions, cadmium ions, and combinations thereof.
The compositions obtained using the thermoplastic elastomer binder of the present invention have a stronger binding force of the sorbent active component to the binder and are less likely to separate under water flow or friction than compositions using non-elastomeric thermoplastic polymers such as polyethylene, polypropylene, and the like as the binder. Meanwhile, the adsorbent particles can be obtained by extrusion at a lower temperature, the preparation process is simple, and the problems of active component failure, adsorption efficiency reduction and the like possibly caused by high-temperature treatment are avoided. The adsorbent composition prepared according to the invention has small bulk density, high adsorption capacity, low manufacturing cost and great commercial potential in the water purifying agent market.
Drawings
The present invention is described with reference to the accompanying drawings so that those skilled in the art can better understand the various features and advantages of the invention.
FIG. 1 is a process flow diagram showing one embodiment of a method for preparing a water purification composition according to the present invention;
FIG. 2 is a graph of a test column for testing arsenic adsorption efficiency and adsorption capacity showing the direction of water flow;
FIG. 3 is a graph of arsenic adsorption efficiency and adsorption capacity of a water purification composition according to the present invention, wherein the binder is a thermoplastic ethylene propylene diene monomer rubber;
FIG. 4 is a graph of arsenic adsorption efficiency and adsorption capacity of a water purification composition according to the present invention, in which the binder is an ethylene-methyl acrylate-glycidyl methacrylate copolymer;
fig. 5 is a graph of arsenic adsorption efficiency and adsorption capacity of a water purification composition according to the present invention, in which a binder is an ethylene-octene copolymer.
Detailed Description
In order that those skilled in the art will further understand the present invention, specific embodiments thereof will be described in detail below with reference to the accompanying drawings. It should be understood, however, that the embodiments of the present invention shown in the drawings and described with reference to the drawings are exemplary only and the present invention is not limited to these embodiments.
According to one aspect of the present invention, there is provided a water purification composition comprising a heavy metal ion adsorbent and a binder, wherein the binder is selected from thermoplastic elastomers.
As is well known to those skilled in the art, the term "thermoplastic elastomer" represents a class of elastomers that have the elasticity of rubber at ordinary temperatures and are moldable at high temperatures.
Preferably, the binder is selected from thermoplastic elastomers having a polyolefin structure.
In the context of the present invention, the term "thermoplastic elastomer having a polyolefin structure" is defined as a thermoplastic elastomer whose main chain is formed by polymerization of carbon-carbon double bonds of an olefin and whose side chains may contain saturated or unsaturated hydrocarbon groups, ester groups or other functional groups.
Preferably, the thermoplastic elastomer is selected from the group consisting of polymers of monomers of monoolefins, diolefins and fatty acid esters having olefinic bonds having from 2 to 20 carbon atoms, preferably from 2 to 10 carbon atoms, and combinations thereof.
In the context of the present invention, the term "polymer" includes both homopolymers and copolymers.
Preferably, the thermoplastic elastomer is selected from the group consisting of copolymers of olefin monomers having 2 to 20 carbon atoms, preferably 2 to 10 carbon atoms, and fatty acid ester monomers having an ethylenic bond having 2 to 20 carbon atoms, preferably 2 to 10 carbon atoms, and combinations thereof.
As examples of the monoolefin, there may be mentioned ethylene, propylene, butene, pentene, hexene, heptene, octene, nonene, decene, styrene, ethylidene norbornene and the like.
As examples of the diolefin, there may be mentioned butadiene, dicyclopentadiene, 1, 4-hexadiene and the like.
As examples of the fatty acid ester having an ethylenic bond, vinyl acetate, methyl acrylate, glycidyl methacrylate, and the like can be mentioned.
As examples of the thermoplastic elastomer, mention may be made of polypropylene elastomers, poly-1, 2-butadiene, ethylene-propylene-diene rubber, ethylene-octene copolymers, styrene-butadiene-styrene block copolymers, ethylene-vinyl acetate copolymers, ethylene-methyl acrylate-glycidyl methacrylate copolymers, or combinations thereof.
Preferably, the thermoplastic elastomer is selected from the group consisting of ethylene propylene diene monomer, ethylene octene copolymer, ethylene methyl acrylate glycidyl methacrylate copolymer, and combinations thereof.
The adsorbent may be an adsorbent known to those skilled in the art to be useful for removing heavy metal ions from water.
Preferably, the adsorbent is selected from the group consisting of metal oxide materials, oxyhydroxide materials, zeolite materials, and combinations thereof.
The metal oxide material includes, but is not limited to, titanium dioxide, manganese dioxide, iron oxide, magnesium oxide, aluminum oxide, cerium oxide, calcium oxide, zinc oxide, iron oxide, and combinations thereof. Preferably, the metal oxide material is selected from the group consisting of titanium dioxide, manganese dioxide, and combinations thereof. Most preferably, the metal oxide material is a combination of titanium dioxide and manganese sand.
As is well known to those skilled in the art, the term "manganese sand" represents a type of mixture commonly used as a filter for groundwater, comprising mainly manganese dioxide, silicon dioxide, iron oxide and mud. Manganese sand is commercially available, such as a manganese sand filter material from Longxin Water purification materials, Inc., of Oncui, which comprises about 40 weight percent manganese dioxide, 17-20 weight percent silica, and about 20 weight percent iron oxide.
The oxyhydroxide materials include, but are not limited to, iron oxyhydroxide, titanium oxyhydroxide, aluminum oxyhydroxide, ferromanganese oxyhydroxide, iron aluminum oxyhydroxide, and combinations thereof. Preferably, the oxyhydroxide material is selected from iron oxyhydroxides. Iron oxyhydroxide is commercially available, e.g., GFH from Leyi Hua Water treatment Co®DRY Media。
In case the adsorbent comprises an oxyhydroxide compound, in particular iron oxyhydroxide, the melting point of the thermoplastic elastomer is preferably not more than 150 degrees celsius, more preferably not more than 120 degrees celsius, to avoid that the high temperature treatment adversely affects the activity of the oxyhydroxide compound.
The zeolite material includes, but is not limited to, type X zeolite, type a zeolite, and combinations thereof. Preferably, the zeolitic material is selected from the group consisting of 13X-type zeolites. Type 13X zeolites are commercially available, such as MOLSIV 13X-APG zeolite from shanghai circumsphere molecular sieve, inc.
In a preferred embodiment, the adsorbent comprises iron oxyhydroxide, manganese sand, and titanium dioxide.
In another preferred embodiment, the adsorbent comprises iron oxyhydroxide, manganese sand, titanium dioxide, and 13X zeolite.
In another preferred embodiment, the adsorbent comprises 5 to 40 wt% of titanium dioxide, 10 to 40 wt% of manganese sand, 30 to 70 wt% of iron oxyhydroxide, and 0.1 to 1 wt% of 13X-type zeolite, based on the total weight of the adsorbent.
In some embodiments, wherein the adsorbent is present in an amount of 80 to 95 wt.%, preferably 85 to 93 wt.%, most preferably 89 to 92 wt.%, based on the total weight of the water purification composition.
In some embodiments, wherein the binder is present in an amount of 5 to 20 wt%, preferably 7 to 15 wt%, most preferably 8 to 11 wt%, based on the total weight of the water purification composition.
Optionally, the water purification composition may further comprise one or more functional additives, including but not limited to bactericides, algicides, scale inhibitors, pH adjusters, and the like, as desired, provided that the additives do not adversely affect the active components of the composition.
In some embodiments, the water purification composition is in the form of a granule having a porosity of > 40%. Porosity measurements are made using methods known to those skilled in the art, for example, by calculating the water displacement volume ratio before and after waxing an equal weight of the particles.
According to another aspect of the present invention, there is provided a method for preparing the above water purification composition, comprising performing the steps of:
step 1: uniformly mixing an adsorbent, a binder and an optional porogen;
step 2: extruding the mixture obtained in the step 1 through an extruder to obtain an extrudate; and optionally (c) a second set of instructions,
and step 3: treating the extrudate obtained in step 2 to obtain a particulate water purification composition of reduced size.
The adsorbent and binder are as previously described. In some embodiments, prior to performing the mixing of step 1, the sorbent is preferably milled such that the particle size of each sorbent component is reduced to below 50 microns.
In some embodiments, step 1 consists in uniformly mixing the adsorbent and binder and porogen.
The porogen used in the present invention may be any suitable porogen known to those skilled in the art, which is preferably liquid at room temperature and water soluble so that it can be subsequently easily dissolved away with water. The use of a porogen results in particles having sufficient porosity to further increase the surface area of the particles that are in contact with the water to be treated.
Examples of the porogen include, but are not limited to, low molecular weight polyethylene glycol, glycerol, propylene glycol, butylene glycol, dimethylformamide, and combinations thereof. Preferably, the porogen is a low molecular weight polyethylene glycol. More preferably, the porogen is polyethylene glycol-600.
In some embodiments, the porogen is present in an amount of 5 to 40 wt%, preferably 10 to 30 wt%, and most preferably 10 to 25 wt%, based on the total weight of the adsorbent.
After the components are uniformly mixed, the obtained mixture is extruded through an extruder to obtain an extrudate.
In some embodiments, the extrusion operation is performed using a twin screw extruder. A suitable twin-screw extruder is for example a co-rotating twin-screw extruder of the SHJ type from south kyo jiya extrusion equipment ltd.
The set of extrusion parameters depends on the type and nature of the adsorbent, binder, and porogen (if present).
In some embodiments, the extrusion is conducted at a temperature in the range of 70 to 120 degrees Celsius. In some embodiments, the screw power is in the range of 15 to 30 Hz. In some embodiments, the feed power is in the range of 10 to 20 Hz. Depending on the degree of mixing, one or more extrusion operations may be performed.
Optionally, the method further comprises step 3 of treating the extrudate to reduce the extrudate size after extrusion molding in step 2. For example, the extrudate may be comminuted. The comminuting operation can be performed by any method and apparatus known in the art, including, but not limited to, mechanical milling. Suitable mills are, for example, DFZ-10 flow mills from Shanghai Dingguang machinery Equipment Inc.
Optionally, the method comprises a step of sieving the extrudate or particles after step 2, or, if step 3 is present, after step 3.
In the case of using a porogen, the method may further comprise the step of removing the porogen. For example, when the porogen used is soluble in water, the porogen can be removed by washing with a large amount of water. Preferably, the amount of water is not less than 20 times the volume of the solid subjected to washing.
After washing, drying may be performed. Drying may be carried out using any suitable drying method known to those skilled in the art, for example, drying may be carried out by air drying at room temperature for more than 48 hours, or baking in a vacuum oven at 50 degrees celsius for 24 hours.
One embodiment of a method for preparing a water purification composition according to the present invention is shown in fig. 1.
According to some embodiments, the water purification composition obtained according to the preparation method of the present invention has a size of 0.2 to 3 mm, preferably 0.4 to 2 mm, more preferably 0.6 to 1.7 mm.
According to some embodiments, the water purification composition obtained according to the preparation method of the present invention has a porosity of > 40%, preferably a porosity of > 45%, most preferably a porosity of > 50%.
According to a further aspect of the present invention, there is provided the use of the water purification composition described above for removing heavy metal ions from water.
In some embodiments, the obtained particulate water purification composition may be packed in a filter for removing heavy metal ions from water. An example of a suitable filter is a large T33 cartridge from yukang water purification equipment, guangzhou, which is a cylindrical cartridge having a length of 250 mm and an internal diameter of 53 mm, and can hold up to 500 ml of particulate material.
In some embodiments, the water purification composition of the present invention can be used to remove heavy metal ions from tap water, drinking water, or industrial wastewater.
Preferably, the water purification composition of the present invention can be used for removing arsenic ions, cadmium ions, lead ions, mercury ions, and combinations thereof from water. More preferably, the water purification composition of the present invention is used for removing arsenic ions from water. Further preferably, the water purification composition of the present invention can reduce the arsenic content in water having an arsenic ion content of about 100 ppb to 10ppb or less.
The adsorbent composition prepared according to the invention can be suitable for complex water flow environment, the active components of the adsorbent are tightly combined with the adhesive, the adsorbent is not easy to fall off, the adsorption efficiency for various heavy metal ions is high, and the adsorption capacity is large. In addition, the preparation method provided by the invention is low in operation temperature, simple and feasible, and avoids adverse effects of high-temperature treatment on active components of the adsorbent.
The present invention will be further described with reference to examples so that those skilled in the art can fully understand the objects, features and effects of the present invention. However, the scope of the present invention is not limited by the following examples.
Examples
Description of the raw materials used in the examples:
FeOOH: iron oxyhydroxide GFH from Iyi Hua Water treatment Co®DRY Media；
TiO2: IITitanium oxide, a MetSorb ™ HMRP available from Grefovisco technologies;
manganese sand: purchased from Longxin Water purification materials, Inc., of Onyi;
13X type zeolite: MOLSIV 13X-APG zeolite available from shanghai circumsphere molecular sieve ltd;
adhesive 1: ethylene propylene diene monomer, EPDM NORDEL available from Dow chemicalTMIP 4820P with an ethylene content of 80 wt% and a third monomer content of 4.9 wt%;
adhesive 2: ethylene-methyl acrylate-glycidyl methacrylate copolymer, LOTADER available from Akoma®AX 8900, wherein the methyl acrylate content is 24 wt% and the glycidyl methacrylate content is 8 wt%;
adhesive 3: ethylene-octene copolymer, ENGAGE available from Dow chemicalTMPOE 8180, wherein octene content is greater than 20 wt%;
polyethylene glycol-600: purchased from national drug group chemical agents, ltd;
NaAsO2standard solution: purchased from the national pharmaceutical group chemical agents limited.
Description of the equipment used in the examples:
an extruder: an SHJ type co-rotating double screw extruder, wherein the diameter of a screw is 36 mm, the length-diameter ratio is 40, the power of a host is 15 kilowatts, and the SHJ type co-rotating double screw extruder is purchased from Nanjing Jie ya extrusion equipment Co., Ltd;
a pulverizer: purchased from Shanghai Dingguan mechanical Equipment, Inc., model DFZ-10;
screening: 30-12 meshes, purchased from chemical reagents of national drug group, ltd;
testing the column: a large T33 cartridge from yukang water purification equipment, guangzhou;
a peristaltic pump: purchased from Heizhouke John's peristaltic Pump, model BT600-2J, Pump head model YZ 35-13;
ICP-MS: inductively coupled plasma mass spectrometry, model iCAP q, was purchased from seimer feishel (china).
Examples 1-3 preparation of Water purification compositions comprising different Binders
The adsorbent, binder and porogen were mixed to homogeneity in the amounts shown in table 1 below. Extruder temperature, main screw power and feed power were set as shown in table 1 below. The mixed homogeneous mixture is fed to the main feed inlet of the extruder and subjected to one or two extrusions to achieve thorough mixing. Sieving the obtained extrudate by using a 30-12 mesh screen or sieving the extrudate by using a 30-12 mesh screen after crushing by using a crusher to obtain particles with the diameter of 0.6-1.7 mm. Thereafter, the particles were washed with water, and the porogen was dissolved and removed. Finally, the granules were left to dry in a ventilated place at room temperature to obtain the water purification composition of the present invention. The bulk densities of the water purification composition particles obtained in examples 1 to 3 were all measured to be 0.6 to 0.7 g/cc by weighing a certain volume of the water purification composition particles. The porosity is between 40% and 70%.
TABLE 1 raw materials, extrusion conditions and product Properties used in examples 1-3
Examples 4-6 arsenic adsorption efficiency and adsorption Capacity test of Water purification compositions
The water purification composition particles obtained in examples 1 to 3 were tested for arsenic adsorption efficiency and adsorption capacity, respectively. The obtained water purification composition particles were packed in a test column having a diameter of 53 mm and a height of 250 mm, the particle packing height was 140 mm, and the total packing volume was about 300 ml.
Using tap water from Shanghai and reagent grade NaAsO2The standard solution was used to prepare an arsenic-containing test water in a 400 liter bucket to obtain an arsenic content of about 100 ppb. No pH adjustment was performed. Thereafter, the above arsenic-containing water sample was caused to flow through the test column at a flow rate of 4 liters/hour in the bottom-to-top direction of the test column as shown in FIG. 2 by means of a peristaltic pump. Samples were taken at intervals at the inlet and outlet of the sample and analyzed for arsenic content by ICP-MS. The results are shown in FIGS. 3 to 5.
As can be seen from FIGS. 3 to 5, at a flow rate of 4 liters/hour, only 300 ml of water purification composition particles can purify about 3000 liters of water samples containing 100 ppb of arsenic to meet the sanitary standard (i.e. less than or equal to 10ppb) of domestic drinking water, and the adsorption efficiency is always kept to be more than or equal to 90%.
The terms "comprising" and "including" as used in the present invention include both the case where they consist of only the elements contained and the case where they contain other elements in addition to the elements contained.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The spirit and scope of the present invention are defined broadly and any other technical entity or method that can be embodied by one or more of the claims, should be considered as encompassed by the claims if it is identical to or equivalent to that defined by the claims.
Claims (15)
1. A water purification composition comprising a heavy metal ion adsorbent and a binder, characterized in that the binder is selected from thermoplastic elastomers.
2. The water purification composition of claim 1, wherein the thermoplastic elastomer is selected from the group consisting of polymers of monomers of monoolefins having 2 to 20 carbon atoms, diolefins and fatty acid esters having olefinic bonds and combinations thereof.
3. The water purification composition of claim 1 or 2, wherein the thermoplastic elastomer is selected from the group consisting of polypropylene elastomers, poly-1, 2-butadiene, ethylene propylene diene monomer, ethylene-octene copolymers, styrene-butadiene-styrene block copolymers, ethylene-vinyl acetate copolymers, ethylene-methyl acrylate-glycidyl methacrylate copolymers, and combinations thereof.
4. The water purification composition of any one of claims 1 to 3, wherein the adsorbent is selected from the group consisting of metal oxide materials, oxyhydroxide materials, zeolite materials, and combinations thereof.
5. The water purification composition of claim 4, wherein the metal oxide material is selected from the group consisting of titanium dioxide, manganese dioxide, magnesium oxide, aluminum oxide, cerium oxide, calcium oxide, zinc oxide, iron oxide, and combinations thereof.
6. The water purification composition of claim 4, wherein the oxyhydroxide material is selected from the group consisting of iron oxyhydroxide, titanium oxyhydroxide, aluminum oxyhydroxide, ferromanganese oxyhydroxide, iron aluminum oxyhydroxide, and combinations thereof.
7. The water purification composition of claim 4, wherein the zeolite material is selected from the group consisting of type X zeolite, type A zeolite, and combinations thereof.
8. The water purification composition of any one of claims 1 to 7, wherein the adsorbent is contained in an amount of 80 to 95 wt% based on the total weight of the water purification composition.
9. The water purification composition of any one of claims 1 to 8, wherein the adsorbent comprises 5 to 40 wt% of titanium dioxide, 10 to 40 wt% of manganese sand, 30 to 70 wt% of iron oxyhydroxide, and 0.1 to 1 wt% of 13X-type zeolite, based on the total weight of the adsorbent.
10. The water purification composition of any one of claims 1 to 9, wherein the composition is a particle with a porosity > 40%.
11. A method of preparing a water purification composition according to any one of claims 1-10, comprising performing the steps of:
step 1: uniformly mixing an adsorbent, a binder and an optional porogen;
step 2: extruding the mixture obtained in the step 1 through an extruder to obtain an extrudate; and optionally (c) a second set of instructions,
and step 3: treating the extrudate obtained in step 2 to obtain a particulate water purification composition of reduced size.
12. The method of claim 11, wherein step 1 consists in uniformly mixing the adsorbent and binder with a porogen selected from the group consisting of low molecular weight polyethylene glycol, glycerol, propylene glycol, butylene glycol, dimethylformamide, and combinations thereof.
13. The method according to claim 12, wherein the porogen is contained in an amount of 5-40 wt% based on the total weight of the adsorbent.
14. A method according to claim 12 or 13, further comprising the step of removing porogens.
15. Use of a water purification composition according to any one of claims 1-10 for removing heavy metal ions from water.
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