WO2011162836A1 - Méthode d'extraction de particules de métal d'une solution aqueuse à l'aide d'un sorbant dérivé d'un sol-gel - Google Patents

Méthode d'extraction de particules de métal d'une solution aqueuse à l'aide d'un sorbant dérivé d'un sol-gel Download PDF

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Publication number
WO2011162836A1
WO2011162836A1 PCT/US2011/025276 US2011025276W WO2011162836A1 WO 2011162836 A1 WO2011162836 A1 WO 2011162836A1 US 2011025276 W US2011025276 W US 2011025276W WO 2011162836 A1 WO2011162836 A1 WO 2011162836A1
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Prior art keywords
sorbate
sol
gel derived
metal particulate
sorbent
Prior art date
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PCT/US2011/025276
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English (en)
Inventor
Paul L. Edmiston
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Abs Materials, Inc
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Publication of WO2011162836A1 publication Critical patent/WO2011162836A1/fr

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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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
    • 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
    • B01J20/10—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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/48—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
    • C08G77/50—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms by carbon linkages
    • C08G77/52—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms by carbon linkages containing aromatic rings
    • 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
    • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
    • C02F1/683—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water by addition of complex-forming 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
    • C02F2101/103—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
    • C02F2101/20—Heavy metals or heavy metal 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
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/203—Iron or iron compound
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate
    • 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

Definitions

  • the present invention relates generally to the chemical arts. More particularly, the invention relates to method for extracting a metal particulate from an aqueous solution using a sol-gel derived sorbent.
  • the method includes the steps of contacting a sorbate ligand with the aqueous solution containing the metal particulate to Form a metal particulate-sorbate ligand complex and contacting a sol-gel derived sorbent with the aqueous solution containing the metal particulate- sorbate ligand complex under conditions effective to cause the sol-gel derived sorbent to sorb the metal particulate-sorbate ligand complex.
  • the sorbate ligand has a log K mv of at least about -0.3.
  • Representative sorbate ligands include 4-acyI-pyrazol-5-olate, ⁇ -dikelones. 8- sulfonamidoquinoline, I -8-bis(octanesuJfonamido)-naphthalene, 2-hydroxy- Snonylbenzophenone, thenoyltrifluoroacetone, cupferron, ketoxime, dieyciohexano-l 8-crown ⁇ 6, l,4 : 8J l-tetrathiacyc3otetradecane, and 5-nonylsalicylaldoxime), bat (2014)anthroline and dithizone.
  • the sol-gel derived sorbent is swellable to at least 1.5 times its volume. And in some embodiments, sol-gel derived sorbent is an aromatically-bridged, organosiloxane sol-gel derived composition, containing a plurality of alkylsiloxy substituents.
  • the trialkoxysilatie is a bis(trialkoxysUylalkyl)benzene. Representative bis(trialkoxysilylalkyl)benzen.es include l,4-bis(trimethoxysilylmethyI)benzene and
  • alkylsiloxy substituents correspond to the formula:
  • R is independently a hydrocarbon containing up to about 30 carbons, x is 1 or 2, y is 2 or 3 and the total of x and y is 4.
  • the alklysiloxy substituents include at least one heteroatom selected from sulfur, oxygen, nitrogen, phosphorous or halogen atom or combinations thereof.
  • the metal particulate is arsenic, cadmium, chromium, cobalt, copper, nickel, lead, manganese, tin, thallium, mercury or iron.
  • Some embodiments include adding a supplemental sorbate to the so!-gel derived sorbent either prior to or during the contacting of sol-gel derived sorbent with the metal particulate- sorbate ligand complex.
  • Representative supplemental sorbates include tetrachloroethylene, ethanol, methanol, acetone, methyl acetate, ethyl acetate, and hexane.
  • sorb means to take up whether by adsorption, absorption, or a combination thereof.
  • sorbate refers to a composition taken up by the sol-gel derived sorbent of the present invention, whether by adsorption, absorption, or a combination thereof.
  • inventive method is of particular use with ligand sorbates bound to metal particulates, where the sorbates have a log K DW > -0.3
  • a ligand is a molecule that makes one or more ionic or coordinate covalent bonds with a metal particulate.
  • the method is of use in extracting metal particulates in the form of metal particles, powders, flakes, and the like. It is of particular use in extracting meta! particulates that exists in a relatively small form (e.g., less than about 1 mm in diameter).
  • Representative metal particulates include, without limitation, heavy metal particulates, such as arsenic, cadmium, chromium, cobalt, copper, nickel, lead, manganese, tin, thallium and mercury.
  • the method is also of use with iron (e.g., ferrous iron).
  • any material that is effective in chelating the metal particulate to be extracted and is a sorbate can be used as a sorbate ligand in the inventive method.
  • the affinity between the sorbate ligand and the metal is such that the equilibrium constant (affinity constant at a certain H, beta) is greater than 100 and the sorbate ligands have a log K DW > -0.3.
  • Representative ligands include, but are not limited to: 4-acyl-pyrazo]-5-olate, ⁇ - diketones, 8-sulfonamidoquinoline, 1 -8-bis ⁇ octanesulfonamido)-naphthalene > 2-hydroxy- Snonylbenzophenone, Ihenoyltrifluoroacetone, cupferron. ketoxime, dicyclohexario-18-crown-6, I. 4, 8, l l-tetrathiacyclotetradecane, and 5-nony 1 salicylal d oxime).
  • Other examples of ligands are disclosed in John H. Montgomery, Grouttdwater Chemicals (CRC Press, 4 Ed., Boca Raton, FL), which is herein incorporated by reference.
  • Sorbate ligands with large non-polar groups such as bat85%anthroline are preferred.
  • a suitable sorbate ftgand is bat85%anthroline and in those embodiments where the metal particulate is the mercuous ion, a suitable ligand is dithizone.
  • a supplemental sorbate is mixed with the sorbate ligand, either before or while the sorbate ligand contacts the sol-gel derived sorbent, in order to enhance the swelling of the sol-gel derived sorbent.
  • Suitable supplemental sorbates typically have a log JK 0W > -03.
  • Representative supplemental sorbates include tetrachloroerhylene, ethanol, methanol, acetone, methyl acetate, ethyl acetate, and hexane.
  • the sol-gel derived sorbent is swellable to at least 1.5 times its volume, when dry, in acetone.
  • Preferred sol-gel derived sorbents are sweiiable to at least two times their original volume, more preferably at least five times their original volume, and in some embodiments up to about eight to ten times their original volume in a sorbate.
  • the swelling of the sol-gel derived sorbent and the sorption of the sorbate is driven by the release of stored tensile force rather than by chemical reaction.
  • the sol-gel derived sorbent is formed of an aromatically-bridged, organosiloxane, sol-gel derived sorbent containing a plurality of alkylsiloxy substituents.
  • the sol-gel derived sorbent contains a pluraiity of flexibly tethered and interconnected organosiloxane particles having diameters on the nanometer scale.
  • the organosiloxane nanoparticles form a disorganized porous matrix defined by a plurality of aromaticaily cross-linked organosiloxanes that create a porous structure.
  • the porous, aromatically-bridged, organosiloxane sol-gel derived sorbents contain a plurality of poiysiloxanes that include an aromatic bridging group flexibly linking the silicon atoms of the poiysiloxanes.
  • Such organosiloxane nanoparticles have a multilayer configuration comprising a hydrophilic inner layer and a hydrophobic, aromatic-rich outer layer, [0028]
  • the sol-gel derived sorbents are formed of a sol-gel derived sorbent obtained using a sol-gel reaction beginning with trialkoxysi lanes containing an aromatic bridging group, Suitable trialkoxysi lanes include,, without limitation, trialkoxysi lanes corresponding to the formula:
  • n and m are individually an integer from 1 to 8
  • Ar is a single-, fused-, or poly- aromatic ring, and each alkoxy is independently a C
  • Bis(trialkoxysiIylalky])benzenes are preferred and include 1,4- bis(trimethoxysilylmethyl)benzene (BTB) » bis(triethoxysilylethyl)benzene (BTEB). and mixtures thereof, with bis ⁇ triethoxysilyiethyi)benzene being most preferred.
  • the tria!koxysilanes are preferably present in the reaction medium at between about 0.25 and about 1M, more preferably between about 0.4M and about 0.8M, most preferably between about 0.4M and about 0.6M.
  • a catalytic solution comprising a stoichiometric amount of water and a catalyst can be rapidly added to the reaction medium to catalyze the hydrolysis and condensation of the trialkoxysilanes.
  • Conditions for sol-gel reactions are well-known in the art and include the use of acid or base catalysts in appropriate solvents. Preferred conditions are those that contain a base catalyst in any suitable solvent
  • Exemplary base catalysts include, without limitation, tetrabutyl ammonium fluoride ("TBAF”), l ; 5-diazabicyclo[4.3.0]non-5-ene (“DBK”), and alkylamines (e.g., propyl amine), of which TBAF is preferred.
  • Suitable solvents for use with the base catalysts include, without limitation, tetrahydrofuran ("TFIF”), acetone,
  • acid catalysts can be used to form swellabfe sol-geis, although acid catalysts are less preferred.
  • Exemplary acid catalysts include, without limitation, any strong acid such as hydrochloric acid, phosphoric acid, sulfuric acid and the like.
  • Suitable solvents for use with the acid catalysts include those identified above for use with base catalysts.
  • the material is preferably aged for an amount of time suitable to induce syneresis, which is the shrinkage of the gel that accompanies solvent evaporation.
  • the aging drives off much, but not necessarily all, of the solvent. While aging times vary depending upon the catalyst and solvent used to form the gel, aging is typically carried out for about 15 minutes up to about 7 days, preferably from about J. hour up to about 4 days. Aging is carried out at room temperature or elevated temperature (i.e., from about 18 C up to about 60 C), either in open atmosphere, under reduced pressure, or in a container or oven.
  • Solvent and catalyst extraction Le., rinsing is carried out during or after the aging process.
  • Preferred materials for extraction include, without limitation, any organic solvent of medium polarity, including, without limitation, THR acetone, ethanol. and acetonttrile, either alone or in combination.
  • the sol-gel is characterized by the presence of residual silanols.
  • the siianol groups allow for denvatization of the gel using any reagent that includes both one or more silanol-reactive groups and one or more non-reactive alkyl groups.
  • the derealization process results in the end-capping of the silanol-terminated polymers present within the sol-gei with alkyisiloxy groups having the formula:
  • each R is independently an aliphatic or non-aliphatic hydrocarbon containing up to about 30 carbons, with or without one or more hereto atoms ⁇ e.g., sulfur, oxygen, nitrogen, phosphorous, and halogen atoms), including straight-chain hydrocarbons, branched-chain hydrocarbons, cyclic hydrocarbons, and aromatic hydrocarbons, x is 1 or 2, y is 2 or 3 and the total of x and y is 4.
  • One suitable class of derivatization reagents includes halosilane reagents that contain at least one halogen group and at least one alk l group R, as defined above.
  • the halogen group can be any halogen, preferably Cl, Fl, I, or Br.
  • Preferred halosilanes or dihalosilanes include, without limitation, chlorosilanes, dichlorosilanes, fiuorosiianes, difluorosilanes, bromosilanes, dibromosilanes, iodosslanes, and di-iodosiianes.
  • halosilanes suitable for use as derivatization reagents include, without limitation, cynanopropyldimethyl- chlorosilane, phenyldimethylchlorosilane, chloromethyldimetliylchlorosilane, (trideca-fluoro- l,l,2,2-tertahydro-octyi)dimethylchlorosilane s n-octyldimethylehlorosilane, and n- octadecyldimethylch lorosi lane.
  • Another suitable class of derivatization reagents includes silazanes or disilazartes. Any silazane with at least one reactive group X and at least one alkyl group R, as defined above can be used.
  • a preferred disilazane is hexamethyldisilazane,
  • the reaction mixture is preferably rinsed in any of the rinsing agents described above, and then dried. Drying can be carried out under any suitable conditions, but preferably in an oven, e.g., for about 2 hr at about 60 C to produce the porous, svvellable, sol- gel derived sorbent.
  • the resulting sol-ge! derived sorbent is hydrophobic, resistant to absorbing water, and s ellable to at least 1.5 times its volume, when dry, in acetone.
  • Preferred sol-gel derived sorbents are swellable to at least two times their original volume, more preferably at least five times their original volume, most preferably up to about eight to ten times their original volume in acetone.
  • a suitable swellable sol-gel derived sorbent is Osorb® swellable sol-gel derived sorbent available from ABS Materials, Wooster, Ohio.
  • the sol-gel derived sorbents can be used in any suitable form, including in powder or pellet forms.
  • Powdered forms of the sol-gel derived sorbents are characterized by a high surface area, for example, in the range of about 800 m 2 /g, which allows for rapid and effective uptake of the sorbate.
  • the particle sizes may vary widely- Preferred powdered forms will have a high surface area (e.g., about 800 m 2 /g) and an average particle size that is less than about 250 ⁇ , for example, between about 50 to about 250 ⁇ .
  • the porous swellable sol-gel derived sorbent and the interactive material are combined with a binder, such as a polymeric binder.
  • a binder such as a polymeric binder.
  • Useful polymeric binders include microcrystalline cellulose and e!astomeric polymers.
  • Preferred elastomeric polymers have a glass transition temperature below about 150 C, the temperature at which the sol-gel derived sorbent begins to decompose.
  • polystyrene is a currently most preferred elastomeric polymer binder.
  • Other suitable thermoplastic elastomers are described in U.S. Patent Nos.
  • the amount of binder will depend on the particular application and will be readi iy determinable by one skilled in the art. In some embodiments, the binder is present in an amount of at least 50% and in some embodiments at least 95% and in some embodiments at least 99.5% based on the weight of the sol-gel derived sorbent.
  • Pellets can be formed in any desired shape and size suitable for their desired application.
  • a sol-gel solution is poured into a silicone mold before gellation. The solution is then gelled in the moid to produce a pellet having the desired dimensions.
  • pellets are prepared by casting the sol-gel derived sorbent in a die having a desired internal configuration and dimension, which will result in a polymerized sol-gel conforming to the desired size and shape.
  • the components are combined using any suitable means, such as by combining in a ball mill.
  • the ingredients are then feed into a die using any suitable means such as by using a screw feeder or a gravity feeder. Screw feeders provide the advantage that they crush infeed particles to achieve a more favorable size consistency before compacting, in some cases, heat generated by the screw feeding process may be beneficial, for example, by softening a thermoplastic polymer binder prior to casting.
  • the die is preheated to a temperature less than the decomposition temperature of the sol-gel derived sorbent, typically- less than about 150 C.
  • the soi-gel derived sorbent is disposed on or within a support.
  • Useful supports include any type of solid or semi-solid object capable of directly or indirectly supporting the sol-gel derived sorbent.
  • the support can be any type of container, vessel, or material having at least one surface for supporting the sol-gel derived sorbent.
  • directly it is meant that the sol-gel derived sorbent is in intimate physical contact with at least one support surface.
  • She sol-gel derived sorbent can be attached, bonded, coupled to, or mated with all or only a portion of the at least one surface.
  • the sol-gel derived sorbent is housed by or within the support without being in direct contact with the support.
  • the sol-gel derived sorbent can be afloat in a fluid (e.g., water) that is contained by the support.
  • the support is a fixed bed reactor (e.g., a packed or fluidized bed reactor) for high flow interaction of the metal-ligand sorbate complex from an aqueous media.
  • the fixed bed reactor contains the soi-gel derived sorbent, in some embodiments encased between two or more layers of a metal or metal alloy (e.g., stainless steel), so that the soi-gel derived sorbent remains stationary or substantially stationary when an aqueous media containing the metal- igand sorbate complex is flowed through the reactor.
  • the fixed bed reactor can include at least one inlet through which the aqueous medium containing the metal-ligand sorbate complex is supplied, and at least one outlet through which aqueous medium discharged.
  • the fixed bed reactor can have any shape (e.g., cylindrical), dimensions, and orientation (e.g. , vertical or horizontal).
  • the fixed bed reactor may be stand-alone or placed directly in-line with the media containing the sorbate to be removed.
  • the fixed bed reactor additionally includes an inert, non-sweiiing filler or media (e.g., ground glass) to provide void spaces for swelling of the sol-gel derived sorbent.
  • the support is a filter having at least one porous membrane entirely or partially formed with, coupled to, bonded with, or otherwise in intimate contact with the sol-gel derived sorbent.
  • the filter has a sandwich-like configuration formed of the sol-gel derived sorbent disposed on or embedded between first and second porous membranes.
  • Suitable porous membranes include materials (e.g., metals, metal alloys, or polymers) having pores of sufficient size to permit passage of the sol -gel derived sorbent.
  • the porous membrane can be comprised of a nano- or micro-sized polymers or polymer-blended materials, such as a nano-sized nylon- polyester blends.
  • the support is a vessel for holding the aqueous medium containing the metal-ligand sorbate complex to be removed.
  • SuiiabJe vessels include stirred tanks or vats.
  • the sol-gel derived sorbent is disposed on or embedded within at least one surface of the vessel.
  • the sol-gel derived sorbent floats or is suspended in aqueous medium containing the sorbate contained within the vessel.
  • the method can find use in a variety of remediation applications, such as remediation of aqueous streams containing metal particulates produced by petroleum production or other industrial processes.
  • remediation can refer to the substantially complete removal of aqueous pollutants (i.e., metal particulates) to achieve the standard(s) set by the responsible regulatory agency for the particular contaminated aqueous media (e.g.. National Primary Drinking Water Regulations for subsurface ground water).
  • remediation applications can include remediation of sludge containing metal particulates produced by mining operations, remediation of toxic metal particulate products due to the occurrence of a natural disaster, remediation of metal particulates as a result of chemical reactions, and/or remediation of soil contaminated with metal particulates.
  • the sorbate ligand is contacted with the aqueous solution containing the metal particulate, so that intimate contact is made between the sorbate ligand and the metal particuiate to form a metal partlculate-sorbate ligand complex. If desired, the mixture can be agitated to facilitate intimate contact between the metal particulate and the sorbate ligand.
  • the sol-gel derived sorbent is contacted with the aqueous solution containing the metal particulate-sorbate ligand complex so that intimate contact is made between the sol-gel derived sorbent and the metal-ligand sorbate complex.
  • the mixture can be agitated to facilitate intimate contact between the sol-gel derived sorbent and the sorbate.
  • stored energy in the sol-gel derived sorbent is released as the porous structure relaxes to an expanded state as the sorbate disrupts the inter-particle interactions holding the sol-gel derived sorbent in the unswoilen state.
  • a supplemental sorbate is added to increase the swelling of the sol-gel derived sorbent and enhance the sorption of the metal- ligand sorbate complex.
  • the sol-gel derived sorbent is contacted with the metal-ligand sorbate complex until substantially all of the metal-ligand sorbate complex has been sorbed or until the sol-gel derived sorbent has become saturated with the metal-ligand sorbate complex.
  • the metai-ligand sorbate complex can be removed from the aqueous component along with the sol-gel derived sorbent
  • the sorbent material can be directly removed or collected (e.g., using tactile means) from a support structure or, alternatively, be removed from the aqueous component via centrifugation, filtration or floatation. Removal of the sorbent material leaves behind an aqueous component that is substantially free of the metal particulate. The remaining aqueous component can then be cleanly collected by pouring, aspiration, evaporation, distil !ation, or other means known in the art.
  • the sol-gel derived sorbent can sorb essentially all of the metal-!igand sorbate complex in the mixture. If complete removal is desired, the mixture can be contacted with enough of the sol-gel derived sorbent to avoid complete saturation of the sorbent.
  • the mixture can be repeatedly contacted with fresh sol-gel derived sorbent until substantially complete interaction with all the sorbate has been accomplished.
  • the soi-gel derived sorbent is regenerated or recovered via evaporation, rinse/drying, and/or chemical treatment.
  • the sol-gel derived sorbent can be heated for a period of time and at a temperature sufficient to separate the metal-iigand sorbate complex from the porous structure of the sol-gel derived sorbent.
  • the resulting regenerated sol-gel derived sorbent is then available for additional metal particulate extraction.

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  • Chemical & Material Sciences (AREA)
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  • Polymers & Plastics (AREA)
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Abstract

L'invention concerne une méthode d'extraction de particules de métal d'une solution aqueuse, la méthode comprenant les étapes suivantes : - Introduire un ligand sorbant dans la solution aqueuse contenant les particules de métal pour former un complexe ligand sorbant/particules de métal; et - Introduire un sorbant dérivé d'un sol-gel pouvant gonfler jusqu'à au moins 1,5 fois son volume comprenant une composition dérivée d'un sol-gel d'organosiloxane aromatique ponté contenant une pluralité de substituants alkylsiloxy, dans la solution aqueuse contenant le complexe ligand sorbant/particules de métal dans des conditions favorables à la sorption du complexe ligand sorbant/particules de métal sur le sorbant dérivé d'un sol-gel.
PCT/US2011/025276 2010-02-17 2011-02-17 Méthode d'extraction de particules de métal d'une solution aqueuse à l'aide d'un sorbant dérivé d'un sol-gel WO2011162836A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017078913A1 (fr) * 2015-11-05 2017-05-11 Chevron U.S.A. Inc. Procédés d'élimination de particules métalliques de l'eau

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