A preparation method of a hybrid membrane adsorbent for removing trivalent chromium ions in water

A trivalent chromium, hybrid membrane technology, applied in chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc. The flocculant has no shape report and other problems, and achieves the effects of increasing removal effect, uniform and stable surface, and simple preparation method.

Active Publication Date: 2019-07-05
太湖县市场监督检验所(太湖县功能膜检测研究院)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since trivalent chromium ions are easily converted into more toxic hexavalent chromium ions (Cr 6+ ), causing water pollution, endangering human health and polluting the environment, so the development of new chromium ion treatment technology is an effective way to solve this kind of heavy metal ion wastewater pollution
[0003] Chinese patent 201510641284.7 proposes a preparation method for removing trivalent chromium ion adsorbent in wastewater, using TiO(OH) 2 Graphene oxide is added to the powder to prepare an adsorbent with graphene oxide as a carrier. However, the adsorbent prepared by this method is a powder adsorbent, and there is no specific report on the removal efficiency of trivalent chromium ions. It is difficult to regenerate and the adsorption efficiency is low. And other shortcomings, can not be applied to large-scale industrial water treatment, so its application value is limited
[0004] Chinese patent 201510605684.2 proposes a grafted modified starch flocculation adsorbent for tannery sewage and its preparation method. The flocculant is prepared by grafting graphene oxide and acrylamide starch, but the flocculant prepared by this method has no Key experimental data such as specific shape reports and reports of low Cr3+ adsorption and removal efficiency, so it cannot be applied to large-scale industrial water treatment, and its application value is limited
[0005] So far, there is no report on the preparation of hybrid membrane adsorbent by sol-gel method for the removal of trivalent chromium ions in water

Method used

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  • A preparation method of a hybrid membrane adsorbent for removing trivalent chromium ions in water
  • A preparation method of a hybrid membrane adsorbent for removing trivalent chromium ions in water
  • A preparation method of a hybrid membrane adsorbent for removing trivalent chromium ions in water

Examples

Experimental program
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Embodiment 1

[0029] The preparation steps of the hybrid membrane adsorbent and the adsorption and removal experiments of trivalent chromium ions are as follows:

[0030] (1) The preparation of the PVA aqueous solution that the mass percentage concentration is 3%: take by weighing 30g average polymerization degree and be the polyvinyl alcohol (PVA) of 1750 ± 50, add 970g distilled water, 92 ℃ of constant temperature heating in water bath (usually reaction temperature It can be at 0-100° C. (in this embodiment, the temperature is 92° C.), stirring continuously at a speed of 35 r / min until the PVA is completely dissolved. After it is completely dissolved, it is taken out, placed at room temperature and naturally cooled to obtain a PVA aqueous solution with a concentration of 3% by mass.

[0031] (2) Preparation of coating solution: in air or nitrogen atmosphere, under the temperature condition of 25°C (usually the reaction temperature can be 0-100°C, in this embodiment, it is selected under t...

Embodiment 2

[0039] Using the same experimental device, operation steps and the same proportioning ratio as in Example 1, the above-mentioned coating solution after static defoaming was impregnated into a coating film on a silica ceramic support until a diaphragm was obtained, and the diaphragm was placed Convective drying in an environment of 100° C. and relative humidity of 90% (usually, the relative humidity of membrane drying is 50-90%, and the upper limit of 90% is selected here) for 24 hours to obtain a hybrid membrane containing a support. The hybrid membrane is a hybrid membrane adsorbent that can be used to remove trivalent chromium ions in water.

[0040] The hybrid membrane prepared in this example was subjected to adsorption of 100 mg / L of Cr(NO 3 ) 3 The experiment of trivalent chromium ion in the solution, the adsorption and removal experiment results show that: under the conditions of 50 ° C and pH = 3, the hybrid film has no effect on Cr 3+ The adsorption capacity is 3.34...

Embodiment 3

[0043] Using the same experimental device, operating steps and the same proportioning ratio as in Example 1, the coating solution was first dissolved with 20 mL of N,N-dimethylformamide (abbreviated as DMF) solvent, and then the obtained substance was directly Flow the coating film on the glass plate of the support until the film is obtained, then dry it in nitrogen at 100 ° C and a relative humidity of 90% for 48 hours, and then peel off the film from the glass plate after cooling at room temperature in the air to obtain a film that does not contain The membrane-like support is a hybrid membrane that can be used to remove trivalent chromium ions from water.

[0044] The hybrid membrane prepared in this example was subjected to adsorption of 100 mg / L of Cr(NO 3 ) 3 The experiment of trivalent chromium ion in the solution, the adsorption and removal experiment results show that: under the conditions of 40 ° C and pH = 3, its effect on Cr 3+ The adsorption capacity is 3.37 mg / ...

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Abstract

The invention discloses a preparation method of a hybrid membrane adsorbent for removing trivalent chromic ions in water. The method comprises the steps that pyromellitic dianhydride is added into a polyvinyl alcohol aqueous solution, a silane coupling agent is added for a sol-gel reaction, a cross-linking agent is added into a sol-gel reaction product, the product is subjected to standing and defoaming, a film coating solution is obtained, and the film coating solution is used for coating film to obtain a diaphragm; or tetraethoxysilane is added into the sol-gel reaction product, the cross-linking agent is added, and the obtained substance is used for coating the film to obtain the diaphragm; or the sol-gel reaction product is used for coating the film to obtain the diaphragm, the diaphragm is soaked in the cross-linking agent for cross linking, drying is conducted, and the diaphragm is obtained directly; or the film coating solution is dissolved with a solvent and then used for coating the film to obtain the diaphragm; the diaphragm is dried to obtain the hybrid membrane adsorbent capable of being used for removing the trivalent chromic ions in the water, and the hybrid membrane adsorbent can contain a supporting body and do not contain the supporting body. The trivalent chromic ions contained in the water can be removed through an adsorption method, and a high absorption removal capacity is achieved for trivalent chromic ions in tannery waste water.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment containing heavy metal ions, and in particular relates to a method for preparing a hybrid membrane adsorbent for removing trivalent chromium ions in water by using a sol-gel method. Background technique [0002] At present, chromium compounds are widely used in industrial technology fields such as leather tanning, electroplating, and IT, and the wastewater generated in the production and processing process contains a large amount of trivalent chromium ions (Cr 3+ ). Since trivalent chromium ions are easily converted into more toxic hexavalent chromium ions (Cr 6+ ), causing water pollution, endangering human health and polluting the environment, so the development of new chromium ion treatment technology is an effective way to solve the pollution of such heavy metal ion wastewater. [0003] Chinese patent 201510641284.7 proposes a preparation method for removing trivalent chromium i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28C02F1/28C02F1/62
CPCB01J20/267B01J20/28033B01J2220/4812C02F1/285C02F2101/22C02F2103/24
Inventor 刘俊生姜慧燕窦卫军
Owner 太湖县市场监督检验所(太湖县功能膜检测研究院)
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