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Rare earth supported catalyst for treating sewage and preparation method and application thereof as well as method for treating sewage through catalytic ozonation

A technology of supporting catalysts and rare earths, which is applied in the direction of physical/chemical process catalysts, water treatment parameter control, chemical instruments and methods, etc., can solve the problems of separation and recovery of difficult metal oxides, achieve convenient preparation methods, low raw material prices, high The effect of catalytic efficiency

Active Publication Date: 2017-07-21
TIANJIN WINFUTURE ENVIRONEMNTAL PROTECTION TECH CO LTD
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Problems solved by technology

[0003] However, this favored non-secondary pollution technology also has certain application limitations, for example: (1) At present, the research on ozone catalysts at home and abroad is mainly single-component catalysts, while the research on supported composite catalysts is relatively limited. (2) After using metal oxides as catalysts for heterogeneous catalytic oxidation to degrade organic wastewater, it is difficult to separate and recover metal oxides

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  • Rare earth supported catalyst for treating sewage and preparation method and application thereof as well as method for treating sewage through catalytic ozonation

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preparation example Construction

[0036] The preparation method of the rare earth supported catalyst of the present invention comprises the following steps:

[0037] (a) impregnating activated carbon in the mixed solution of sulfuric acid and zinc chloride, and then drying the impregnated activated carbon to obtain modified activated carbon;

[0038] Among the present invention, adopt chemical method to carry out modification to gac, specifically:

[0039] Sulfuric acid and zinc chloride are mixed to prepare compound solution, preferably, the concentration of raw material sulfuric acid is 3.0mol / L, and the concentration of raw material zinc chloride solution is 3.0mol / L; The volume ratio of sulfuric acid and zinc chloride solution is 1: 1;

[0040] Then, impregnate the activated carbon in the compound solution, and oscillate ultrasonically at room temperature for 6-18 hours; preferably, oscillate in an ultrasonic oscillator;

[0041] Next, filter the impregnated activated carbon and wash it with deionized wa...

Embodiment 1

[0060] The preparation method of the rare earth supported catalyst provided by the present invention can be specifically referred to as follows:

[0061] (a) take appropriate amount of 3.0mol / L sulfuric acid and 3.0mol / L zinc chloride solution respectively according to the volume ratio of 1:1, then mix to obtain compound solution;

[0062] Then, impregnate the activated carbon in the compound solution, and vibrate in an ultrasonic oscillator for 12 hours at room temperature;

[0063] Next, filter the impregnated activated carbon and repeatedly wash it with deionized water until the surface of the activated carbon is neutral, then put it in a vacuum drying oven, and dry it at 110°C for 6 hours; grind it after drying, and sieve it to obtain Modified activated carbon, and put it in a desiccator for later use.

[0064] (b) Weigh an appropriate amount of lanthanum oxide and gadolinium oxide powder respectively according to a molar ratio of 1:1, then mix the lanthanum oxide and gad...

experiment example 1

[0073] (1) Modified activated carbon test:

[0074] Get according to the activated carbon after embodiment 1 step (a) modification, and the same raw material activated carbon as in embodiment 1, and compare surface area, average pore diameter and pore volume respectively and test, test result is shown in the following table:

[0075] sample Specific surface area / m 2 g -1

Average pore size nm Pore ​​volume / cm 3 g -1

Unmodified Activated Carbon 322 3.20 0.18 Modified activated carbon 579 2.80 0.26

[0076] From the comparison data of the above tests, it can be seen that compared with unmodified activated carbon, the specific surface area and pore volume of modified activated carbon are greatly improved, which is also conducive to increasing the loading capacity of activated carbon, thereby improving ozone catalytic performance. Catalytic Reaction Efficiency for Advanced Oxidation Reactions.

[0077] (2) Sewage treatment experiment...

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Abstract

The invention discloses a rare earth supported catalyst for treating sewage and a preparation method and application thereof as well as a method for treating the sewage through catalytic ozonation. The rare earth catalyst disclosed by the invention comprises a modified activated carbon carrier and rare earth composite activity components loaded on modified activated carbon; and the rare earth composite activity components consist of lanthanum oxide and gadolinium oxide. The rare earth catalyst prepared by the method disclosed by the invention is characterized by high reaction activity, stable performance, good recycling property and the like; meanwhile, the preparation method disclosed by the invention is simple in process, and can easily achieve large-scale industrialized production. By adopting the rare earth catalyst, high-efficiency removal of organic wastewater which is difficult to degrade can be realized through ozone-catalytic advanced oxidation technology, the operation is simple, the maintenance is convenient, and the rare earth supported catalyst has excellent economic benefit and social benefit.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a rare earth-loaded catalyst for treating sewage, a preparation method and application thereof, and a method for treating sewage by ozone catalytic oxidation. Background technique [0002] Catalytic ozonation technology produces highly oxidizing free radicals under alkaline conditions, especially hydroxyl radicals, which undergo substitution, bond breaking, and addition with organic pollutants to decompose refractory organic macromolecules into non-toxic Or slightly toxic inorganic substances, so that the wastewater can be discharged into the environment up to the standard. [0003] However, this favored non-secondary pollution technology also has certain application limitations, for example: (1) At present, the research on ozone catalysts at home and abroad is mainly single-component catalysts, while the research on supported composite catalysts is relatively limited. (2) After ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10C02F1/78
CPCB01J23/002B01J23/10C02F1/725C02F1/78C02F2209/08
Inventor 战树岩刘佩春
Owner TIANJIN WINFUTURE ENVIRONEMNTAL PROTECTION TECH CO LTD
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