Method for degrading dyeing wastewater by using metal-free catalytic system

A technology for metal-free catalysis and printing and dyeing wastewater, applied in chemical instruments and methods, textile industry wastewater treatment, special compound water treatment, etc., can solve the problems of limiting the practical application of catalytic systems, narrow pH value range, and difficult removal of iron ions , to achieve obvious removal effect, little environmental damage and low cost

Inactive Publication Date: 2016-12-07
ZHEJIANG SCI-TECH UNIV
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  • Application Information

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Problems solved by technology

Although the Fenton method has the advantages of easy operation, no need to consume external energy, and complete oxidation, there are still some inherent defects in the traditional Fenton reaction: (1) The pH value of the Fenton reaction is narrow, and it can only be carried out in a strongly acidic medium of 2-4 (2) A large amount of iron ions that exist in the r

Method used

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  • Method for degrading dyeing wastewater by using metal-free catalytic system
  • Method for degrading dyeing wastewater by using metal-free catalytic system

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The selected metal-free catalyst is octadecyltrimethylammonium bromide (OTAB), and the oxidant is permonomonosulfate (PMS). The reaction was carried out in a 40ml reaction vessel, and 0.92mM octadecyltrimethylammonium bromide (OTAB) and 0.25mM permonomonosulfate (PMS) were successively added to acid orange with pH=7 and a concentration of 100μM. (AO7), after reacting at room temperature for 2 minutes, the removal rate of the dye AO7 reached over 98%, the effect diagram is as follows figure 1 shown.

Embodiment 2

[0023] The metal-free catalyst is cetyltrimethylammonium bromide (CTAB), and the oxidant is permonomonosulfate (PMS). The reaction was carried out in a 40ml reaction vessel, and 0.92mM cetyltrimethylammonium bromide (CTAB) and 0.25mM permonomonosulfate (PMS) were successively added to acid orange with pH=7 and a concentration of 100μM. In (AO7), the removal rate of dye AO7 reached 81.2% after reacting at room temperature for 2 minutes; after reacting at room temperature for 5 minutes, the removal rate of dye AO7 was as high as 99%. The effect diagram is as follows figure 2 shown.

Embodiment 3

[0025] The selected metal-free catalyst is tetradecyltrimethylammonium bromide (TTAB), and the oxidant is permonomonosulfate (PMS). The reaction was carried out in a 40ml reaction vessel, and 0.92mM tetradecyltrimethylammonium bromide (TTAB) and 0.25mM permonomonosulfate (PMS) were successively added to acid orange with pH=7 and a concentration of 100μM. (AO7), after reacting at room temperature for 40 minutes, the removal rate of dye AO7 reached 95%.

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Abstract

The invention discloses a method for degrading dyeing wastewater by using a metal-free catalytic system. According to the method, a metal-free catalyst activation oxidizer is utilized to generate reactive species (hydroxy free radicals -OH which have higher oxidation-reduction potential 1.8-2.7V) at normal temperature, thereby degrading dyeing wastewater efficiently. The method disclosed by the invention overcomes the defects of secondary pollution, low oxydol utilization ratio, narrow pH application range and the like in the traditional Fenton process, has the advantages of mild reaction conditions, obvious removal effect, no metal pollution, small environmental hazard, low catalyst consumption and low cost, and is simple to operate.

Description

technical field [0001] The invention belongs to the field of printing and dyeing wastewater treatment methods, in particular to a method for degrading printing and dyeing wastewater with a metal-free catalytic system. Background technique [0002] my country is a big textile country. According to the "National Environmental Statistical Bulletin", the discharge of textile wastewater in my country has reached more than two billion tons, of which printing and dyeing wastewater accounts for about 80%, which has caused serious pollution to the environment. Therefore, how to efficiently treat printing and dyeing wastewater has always been an urgent problem to be solved. [0003] At present, the more commonly used and effective method for treating printing and dyeing wastewater is the Fenton method. The Fenton method is a kind of advanced oxidation technology, and its reaction reagent is composed of ferrous ion and hydrogen peroxide (H 2 o 2 ) composition, the hydroxyl radical (...

Claims

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Application Information

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IPC IPC(8): C02F1/72B01J31/02C02F103/30C02F101/30
CPCC02F1/722C02F1/725B01J31/0239C02F2103/30C02F2101/308C02F2305/023
Inventor 姚玉元岳庆杨志远张利
Owner ZHEJIANG SCI-TECH UNIV
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