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Method used for catalytic degradation of arylamine waste water using photocatalysis material

A photocatalytic and aromatic amine technology, applied in chemical instruments and methods, special compound water treatment, light water/sewage treatment, etc., can solve the problems of poor biodegradability, difficult high-concentration aniline wastewater, treatment, etc., and achieve the cost of wastewater treatment Reduced, widely used, cost-reduced effects

Active Publication Date: 2019-01-11
赵兴海
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many ways to deal with aniline pollutants. 1. Adsorption method: the method of treating aniline wastewater with adsorption materials has the characteristics of recyclable aniline and reusable adsorbent, but there is an adsorption balance, and it is difficult to carry out high-concentration aniline wastewater. Treatment; 2. Biological methods: Due to the strong toxicity of aniline wastewater and poor biodegradability, it is difficult for existing biochemical treatment systems to effectively remove pollution, but with the screening and separation of highly efficient aniline-degrading bacteria, biological treatment methods have great potential; 3. , Supercritical water oxidation method: use supercritical water as the reaction medium, air, oxygen or hydrogen peroxide as the oxidant, and oxidize organic substances such as aniline into carbon dioxide, water, nitrogen and salts through free radical reactions under high temperature and pressure It is a non-toxic small molecular compound, but it needs a special supercritical water oxidation experimental device for supporting use; in 2004, Zhejiang University Chen Yingxu et al. System photocatalytic degradation of aniline) developed a UV / H 2 o 2 A method for degrading aniline wastewater, using butyl titanate as a raw material, using bentonite as a carrier, and synthesizing TiO with an acidic sol method 2 Nanocomposite, and using the composite as a catalyst, in H 2 o 2 Photocatalytic degradation of aniline solution in the presence of UV light and H 2 o 2 The catalytic degradation can only be performed under the presence of the same time, and the maximum degradation rate of aniline is only 41% after 2 hours; TiO 2 As a catalyst, it has the characteristics of non-toxicity, corrosion resistance, high stability and low cost, but TiO 2 The forbidden band of TiO is wide, and it can only absorb the part of ultraviolet light that accounts for only 4% of sunlight, which severely limits the performance of TiO2. 2 Effective application of photocatalytic materials to sunlight
[0006] Although there are a variety of treatment methods for aniline wastewater, each treatment method has its own limitations, and there is no practical method for degrading p-trifluoromethoxyaniline in indoxacarb wastewater

Method used

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  • Method used for catalytic degradation of arylamine waste water using photocatalysis material
  • Method used for catalytic degradation of arylamine waste water using photocatalysis material
  • Method used for catalytic degradation of arylamine waste water using photocatalysis material

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Preparation of composite photocatalyst of nickel-doped zinc tungstate:

[0036] 1) Carrier preparation: put 4.0g of diammonium hydrogen phosphate and 6.0g of calcium nitrate in water, stir and mix, add hydrochloric acid dropwise to adjust the solution until it is clear, stir for 3-5min, then add 2-3g of urea, react at 90°C for 2-3h , ultrasonically aged for 24 hours, filtered, washed with water, and vacuum-dried at 60°C to form a porous apatite carrier;

[0037]2) Put 10.0g of porous apatite in ultrapure water, then add nickel nitrate hexahydrate (0.18g, 0.6mmol), zinc nitrate hexahydrate (0.30g, 1mmol) and sodium tungstate dihydrate (0.46g , 1.4mmol) in a hydrothermal kettle at 180-200°C for 6-8h; after the reaction, wash with water until the filtrate becomes neutral, and then roast at 260-300°C for 1-2h to obtain nano-scale nickel salt modified tungsten Zinc acid photocatalytic material, its scanning electron microscope picture is as follows figure 1 As shown, it ca...

Embodiment 2

[0039] Preparation of composite photocatalyst of nickel-doped zinc tungstate:

[0040] Compared with Example 1, the difference is that the addition amount of nickel nitrate hexahydrate is 60 mg, 0.2 mmol, and the rest of the operations are exactly the same as in Example 1.

Embodiment 3

[0074] Although the present invention has higher catalytic activity and versatility, it cannot be recycled; the test results show that after the catalyst recovered by photocatalytic degradation is filtered, washed with water, then dried and reused, the indene of trifluoromethoxyaniline The degradation rate of p-trifluoromethoxyaniline in chorcarb wastewater was reduced from 95.0% (pH=8.0, catalyst dosage 15g / L wastewater) to 58.3%.

[0075] The present invention has attempted following several catalyst activation methods:

[0076] 1) Roasting: the catalyst is filtered and separated, washed with water, and then calcined at 260-300°C for 1-2 hours;

[0077] 2) Pickling / roasting: After the catalyst is filtered and separated, it is soaked in 1mol / L hydrochloric acid aqueous solution and ultrasonicated for 2 hours, and then filtered and roasted at 260-300°C for 1-2 hours;

[0078] 3) Alkaline washing / roasting: After the catalyst is filtered and separated, it is soaked in a 1mol / L ...

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Abstract

The invention belongs to the technical field of chemical waste water processing, and more specially relates to a method used for catalytic degradation of arylamine waste water using a photocatalysis material. According to the method, apatite is taken as a carrier, a nitrate hexahydrate, zinc nitrate hexahydrate, and sodium tungstate dehydrate are taken as raw materials, hydro-thermal reaction is adopted to prepare the nickel salt modified zinc tungstate photocatalysis material. The preparation method is simple; the obtained photocatalysis material is capable of degrading arylamines such as phenylamine, parachloroaniline, or m-toluidine, and the degradation rate of phenylamine is as high as 98.6%.

Description

[0001] The original application number is 2018100450228, the name is a method for the catalytic degradation of chemical wastewater by a new type of catalytic material, and the application date is 2018.01.17. technical field [0002] The invention belongs to the technical field of chemical wastewater treatment, and in particular relates to a method for catalytically degrading aromatic amine wastewater by a photocatalytic material. Background technique [0003] The chemical name of indoxacarb is 7-chloro-2,3,4a,5-tetrahydro-2-[methoxycarbonyl(4-trifluoromethoxyphenyl)carbamoyl]indeno[1,2- e][1,3,4-]Methyl oxadiazine-4a-carboxylate, CAS number is 120068-37-3; indoxacarb is a sodium channel inhibitor developed by DuPont, mainly to block pests Sodium channels in nerve cells, causing poor coordination, paralysis, and eventual death in target pests. The pesticide enters the insect body through contact killing and ingestion, and the behavior of the pest changes rapidly, causing the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30C02F1/72B01J23/888C02F101/30C02F101/36C02F101/38C02F103/36
CPCC02F1/30C02F1/722C02F1/725B01J23/888B01J35/004C02F2305/10C02F2103/36C02F2101/306C02F2101/38C02F2101/36
Inventor 赵兴海
Owner 赵兴海
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