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Catalyst for processing azo dyes in printing and dyeing waste water and preparation method

An azo dye, printing and dyeing wastewater technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of easy dissolution, short catalyst life, etc. The effect of increasing the degradation effect, improving the lifespan, and reducing the content of active metal components

Inactive Publication Date: 2012-05-23
CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to design and develop a honeycomb-shaped solid catalyst for the existing catalysts used to treat azo dyes in printing and dyeing wastewater, which are easy to dissolve under high temperature, high pressure, acid and alkali environments, resulting in short catalyst life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] By mass percentage:

[0035] Bentonite 70% Alkyl Sulfonate 10% Azodicarbonamide (AC) 6%

[0036] Cerium oxide 5% Lanthanum oxide 2% Niobium 5% Tantalum 2%

[0037] Its preparation method is as follows:

[0038] Weigh each raw material according to the mass ratio of the original formula, dry and grind the bentonite at 101°C, then add alkylsulfonate and azodicarbonamide (AC), mix well, and sinter at 600°C for 5 hours. To obtain a honeycomb solid, dissolve cerium oxide and lanthanum oxide in a nitric acid solution with a concentration of 30%, filter, add dimethylglyoxime, niobium, and tantalum to the filtrate, and obtain a metal dispersion system; Soak in the dispersion system for 35 minutes and dry to obtain a honeycomb solid catalyst.

example 2

[0040] By mass percentage:

[0041] Diatomaceous Earth 40% Dioctyl Sebacate (DOS) 20%

[0042] Tricresyl Phosphate (TCP) 5% Azobisisobutyronitrile (ALBN) 2%

[0043] Neodymium oxide 10% Erbium oxide 5% Nickel 11% Copper 7%

[0044] Its preparation method is as follows:

[0045] Weigh each raw material according to the mass ratio of the original formula, dry diatomaceous earth at 102°C, grind it, and then add dioctyl sebacate (DOS), tricresyl phosphate (TCP), and azobisisobutyronitrile (ALBN), mixed evenly, and sintered at 585°C for 4 hours to obtain a honeycomb solid. Dissolve neodymium oxide and erbium oxide in a nitric acid solution with a concentration of 38%, filter, and add dimethylglyoxime, nickel, and copper to obtain a metal dispersion system; soak the obtained honeycomb solid in the dispersion system for 28 minutes and dry to obtain a honeycomb solid catalyst.

example 3

[0047] By mass percentage:

[0048] Attapulgite 65% Chlorinated Paraffin 5%

[0049] Cresyl diphenyl phosphate (CDP) 7% p-toluenesulfonyl hydrazide (TSH) 3%

[0050] Rubidium Oxide 6% Praseodymium Oxide 3% Bismuth 6% Copper 5%

[0051] Its preparation method is as follows:

[0052]Weigh each raw material according to the mass ratio of the original formula, dry the attapulgite at 103°C, grind it, then add chlorinated paraffin, cresyl diphenyl phosphate (CDP), p-toluenesulfonyl hydrazide (TSH), and mix well , sintered at 700°C for 6 hours to obtain a honeycomb solid, dissolve rubidium oxide and praseodymium oxide in a nitric acid solution with a concentration of 35%, filter, add dimethylglyoxime, bismuth, and copper to the filtrate to obtain a metal dispersion system; soak the obtained honeycomb solid in the dispersion system for 40 minutes and dry to obtain the honeycomb solid catalyst.

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Abstract

The invention discloses a catalyst for processing azo dyes in printing and dyeing waste water and a preparation method. The catalyst disclosed by the invention contains an active metal component, a rare-earth metal oxide, a plasticizer, an organic foaming agent, a curing agent and the like. The specific preparation method of the catalyst comprises the following steps of: (1) weighing a proper amount of curing agent according to the mass percentage of a formula, drying, grinding and sieving the curing agent, adding the plasticizer and the organic foaming agent and mixing uniformly, and sintering at 500-800 DEG C for 4-6 h to obtain a honeycomb type solid; (2) weighing a certain amount of rare-earth oxide, dissolving the rare-earth oxide in a nitric acid solution with the concentration of 20-40%, filtering, and adding dimethylglyoxime and the active metal component into the filtrate to obtain a metal dispersion system; and (3), immersing the obtained honeycomb type solid in the dispersion system for 5-45 min, and drying to obtain a honeycomb type solid catalyst. The catalyst prepared by using the preparation method has the characteristics of long service life, higher activity, better catalytic property on the azo dyes in the printing and dyeing waste water and the like.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a catalyst and a preparation method for treating azo dyes in printing and dyeing wastewater, belonging to the field of printing and dyeing wastewater treatment. Background technique [0002] At present, the commonly used azo dye wastewater treatment methods include adsorption method, magnetic separation method, membrane separation method, coagulation method, biological method and so on. The adsorption method is to mix the porous inorganic adsorbent powder or particles with the wastewater, so that the pollutants of the wastewater are adsorbed on the adsorbent to achieve the purpose of removal, but this method is easy to be saturated; the magnetic separation method is to remove the particles in the water first. Magnetization re-separation has the characteristics of fast filtration and less land occupation, but the removal rate is not high; the membrane separation method is to a...

Claims

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Application Information

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IPC IPC(8): B01J23/20B01J23/83B01J23/843B01J23/847B01J35/10C02F1/30C02F1/58C02F1/72
Inventor 雷春生雷思宇范璐璐
Owner CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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