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Heavy metal ion adsorption film and preparation method thereof

A technology for heavy metal ions and adsorption membranes, applied in alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of poor uniformity, instability, and damage to the membrane structure of membrane adsorbents, and expand the adsorption surface area , Promote adhesion tendency, enhance the effect of adsorption capacity

Inactive Publication Date: 2016-08-03
NINGBO XIAYUAN TECH
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Problems solved by technology

[0003] In the invention patent with the application number CN201010533375.6, a membrane adsorbent for effectively removing heavy metal ions in drinking water and its preparation method are introduced, mainly by blending polymers and resins in solvents such as dimethyl sulfoxide and tetrahydrofuran To prepare membrane adsorbent, but the membrane adsorbent prepared by this method has poor uniformity and instability
In the invention patent with the application number CN201310528926.3, a preparation method of a hybrid membrane adsorbent for removing heavy metal ions in water is introduced. Under the action of dilute acid, polyvinyl alcohol and crosslinking agent, silane The coupling agent is prepared by the sol-gel method to prepare the hybrid membrane adsorbent, but the membrane adsorbent prepared by this method not only has a small adsorption capacity, but also usually takes a long time for the entire sol-gel process, and the gel is inevitably There are a large number of micropores, which will escape a lot of gas and organic matter during the drying process, and shrink, destroying the membrane structure

Method used

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  • Heavy metal ion adsorption film and preparation method thereof

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preparation example Construction

[0035] A preparation method for a heavy metal ion adsorption membrane, comprising the steps of:

[0036] S100 Disperse the metal organic framework material in the corresponding weight part in the solvent A, add the modifying agent under stirring, raise the temperature to 60°C, continue stirring for 1-5 hours, and add the stabilizer to form a dispersion liquid;

[0037] S200 dissolving 2-mercaptobenzimidazole in solvent B, adding the obtained solution into the dispersion liquid, and continuing to stir at 60°C for 1 to 6 hours to obtain a casting solution;

[0038]S300 filtering the casting solution and standing for defoaming for 1 to 2 hours, casting it on a glass plate, and drying it in an oven; and

[0039] S400 is heat-treated at 110-120°C for 1-5 hours, then placed in 2mol / L sulfuric acid for 10-24 hours, then rinsed with water until the washing liquid is neutral, and then put the wet film under vacuum at 50-60°C The metal-organic framework material composite film immobili...

Embodiment 1

[0052] (1) Preparation of metal organic framework materials

[0053] The preparation of metal-organic framework material MIL-100 includes the steps of: dissolving 2.7g of ferric chloride hexahydrate in 50mL of deionized water, stirring to fully dissolve, then adding 1.39g of trimesic acid, and continuing to stir for 0.5h. Finally, the above solution was put into an autoclave to react at 130°C for 72h. After the reaction was completed, it was cooled to room temperature, washed three times with hot water and methanol, boiled in boiling methanol for 12 hours, and vacuum-dried at 150° C. for 12 hours to obtain a metal-organic framework material.

[0054] (2) Preparation of Heavy Metal Ion Adsorption Membrane

[0055] Weigh 30 parts of metal organic framework materials and disperse them in 60 parts of dimethylformamide, add 3 parts of sodium lauryl sulfate under stirring, raise the temperature to 60°C, continue stirring for 1 hour, add 2 parts of phosphate buffer to form a dispers...

Embodiment 2

[0060] The composition in parts by weight of each component is as follows. The preparation method and performance test of the adsorption film are the same as in Example 1, and the main performance indicators are shown in Table 1. MIL-100 is 20 parts, 2-mercaptobenzimidazole is 5 parts, modifier sodium lauryl sulfate is 3 parts, stabilizer phosphate buffer is 2 parts, solvent A dimethylamide is 60 parts, Solvent B ethanol is 5 parts. The conditions are that the mass ratio of metal organic framework material to 2-mercaptobenzimidazole is 4:1, and the mass ratio of solvent A to solvent B is 12:1.

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Abstract

The invention relates to a heavy metal ion adsorption film and a preparation method thereof. The adsorption film is composed of a metal organic frame material, 2-mercapto benzimidazole, a modifier, a stabilizer, a solvent A and a solvent B. The 2-mercapto benzimidazole is fixedly carried on the metal organic frame material and is used for enhancing the adsorption capacity of the adsorption film for the heavy metal ion.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to an adsorption membrane suitable for efficiently adsorbing heavy metal ions in wastewater and a preparation method thereof. Background technique [0002] With the rapid development of industrial society, the heavy metal ions in the environment are increasing day by day, mainly Cr 6+ , U 6+ 、 Te 3+ 、Co 3+ 、Se 6+ 、Pu 3+ , Hg 2+ , Mn 4+ Wait. Heavy metal pollutants enter the environment in the form of wastewater, waste gas, and waste residue, and enter the surface and groundwater environment through atmospheric deposition, surface runoff, and soil leaching, thereby polluting drinking water sources. According to research and investigation, industrial "three wastes" and agricultural fertilizers and pesticides are the main sources of heavy metals in the environment. Heavy metal pollutants have the characteristics of high toxicity, refractory degradation, and bioaccumulation. They...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/226B01J20/28033C02F1/285C02F2101/20
Inventor 魏亮
Owner NINGBO XIAYUAN TECH
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