CoFe2O4/nitrogen-doped sludge-based activated carbon catalyst for activating persulfate to perform advanced treatment on coking wastewater and preparation method thereof

A technology for activating persulfate and advanced treatment, which is applied in physical/chemical process catalysts, chemical instruments and methods, oxidized water/sewage treatment, etc., and can solve the problem of uneven distribution of active component nanoparticles, high equipment requirements, and catalytic Low activity and other problems, to achieve high catalytic stability and service life, enhance catalytic activity, and strengthen the effect of catalytic action

Inactive Publication Date: 2019-03-19
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The traditional supported catalyst preparation method has the disadvantages of uneven distribution of active component nanoparticles on the carrier, easy agglomeration, large particle size, and high equipment requirements.
[0008] Patent CN 106540672 A discloses a magnetic porous sludge carbon-supported metal oxide catalyst and its application in the degradation of azo dyes by persulfate oxidation reaction, which uses a single metal oxide as the active component of the catalyst, or Cobalt oxide, or iron oxide, or copper oxide, low catalytic activity

Method used

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  • CoFe2O4/nitrogen-doped sludge-based activated carbon catalyst for activating persulfate to perform advanced treatment on coking wastewater and preparation method thereof
  • CoFe2O4/nitrogen-doped sludge-based activated carbon catalyst for activating persulfate to perform advanced treatment on coking wastewater and preparation method thereof
  • CoFe2O4/nitrogen-doped sludge-based activated carbon catalyst for activating persulfate to perform advanced treatment on coking wastewater and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The main raw material for preparing sludge-based activated carbon—sludge is taken from the sludge thickening tank of Anshan Iron and Steel Coking Plant. The specific properties are shown in Table 1, Table 2 and Table 3:

[0049] Table 1: Basic properties of coking plant thickener sludge

[0050]

[0051] Table 2: Heavy metal content of dry sludge in thickening tank of coking plant

[0052]

[0053] Table 3: Organic content of dry sludge in thickening tank of coking plant

[0054]

[0055] A kind of CoFe activated persulfate for advanced treatment of coking wastewater 2 o 4 / Nitrogen-doped sludge-based activated carbon catalyst preparation method, comprising:

[0056] (1) Preparation of sludge-based activated carbon: Mix 10g of sludge powder and straw at a mass ratio of 3:1, add 30mL of 20% zinc chloride solution and impregnate for 16h, then activate in a tube furnace at 500°C for 2h, wash with hydrochloric acid 1. After washing with water, dry at 80°C in a ...

Embodiment 2

[0090] The same as the implementation of Example 1, when preparing sludge-based activated carbon, the mass ratio of sludge to straw was replaced by 1:1, the concentration of zinc chloride was replaced by 50%, the volume was replaced by 20mL, the soaking time was replaced by 12h, and the activation temperature was Replaced with 500°C, carbonization time replaced with 1h; preparation of CoFe 2 o 4 / N-doped sludge-based activated carbon Co(NO 3 ) 2 ·6H 2 The quality of O is replaced by 5.85g, Fe(NO 3 ) 3 9H 2 The quality of O was replaced by 16.20g, the dosage of citric acid was replaced by 12.65g, the pH was adjusted to 5 with ammonia water, the temperature of the water bath was replaced by 80°C, the dosage of sludge-based activated carbon was replaced by 18.81g, and the amount of acrylamide was replaced by Replace the amount of 10g and initiator ammonium persulfate with 0.15g, replace the firing temperature with 600°C, and replace the firing time with 1h, as follows:

[...

Embodiment 2

[0094] Implementation Example 2, CoFe 2 o 4 / Nitrogen-doped sludge-based activated carbon (CoFe 2 o 4 / N-SAC) and the N, O, C content of sludge-based activated carbon SAC and the XPS results of different forms of structured nitrogen content are shown in Table 6 below;

[0095] Table 6: XPS results of N, O, C content and different forms of structured nitrogen content in the catalyst

[0096]

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Abstract

The invention relates to a CoFe2O4/nitrogen-doped sludge-based activated carbon catalyst for activating persulfate to perform advanced treatment on coking wastewater, which takes nitrogen-doped sludge-based activated carbon as a carrier, and a composite metal oxide cobalt ferrite CoFe2O4 of a spinel structure as an active component. The preparation method comprises the following steps: firstly converting concentrated sludge of a coking plant into sludge-based activated carbon, and then preparing the catalyst by calcining the sludge-based activated carbon by adopting a polymer-network gel method by taking nitrate of cobalt and iron as a precursor and taking acrylamide as a nitrogen source. The preparation method disclosed by the invention is simple and efficient, polyacrylamide formed by virtue of acrylamide polymerization synchronously realizes nitrogen doping of the sludge-based activated carbon and uniform loading of CoFe2O4, and therefore, not only is the catalytic synergistic effect of the carrier enhanced by sufficiently utilizing structuralized nitrogen, but also the catalytic effect of CoFe2O4 can be enhanced, so that the catalytic performance of the catalyst is remarkably improved. In addition, the catalyst prepared according to the invention remains that CoFe2O4 has magnetism, rapid recycling can be realized under the effect of a magnetic field, and sludge treatment ofthe coking plant is solved.

Description

technical field [0001] The invention relates to the technical field of water treatment and the field of materials, in particular to a supported catalyst for activating persulfate for advanced treatment of coking wastewater, in particular to CoFe 2 o 4 / Nitrogen-doped sludge-based activated carbon catalyst and preparation method. Background technique [0002] The coking industry has always been an industry that pollutes the environment more seriously. The coking wastewater produced by it is toxic, harmful, and refractory to high-concentration organic wastewater. It is difficult to treat and has become an urgent problem in the field of environmental protection at this stage. Due to the complex water quality of coking wastewater, the wastewater that cannot be treated by secondary biochemical treatment has poor biodegradability. With the improvement of national discharge standards and the regulation of zero discharge, advanced treatment of coking wastewater is imperative. Amon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/72C02F101/30
CPCB01J27/24B01J35/0033C02F1/725C02F2101/30
Inventor 李丽华陶永康任立兄梁玉王鑫
Owner UNIV OF SCI & TECH LIAONING
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