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Catalyst for organic wastewater treatment and preparation method thereof

A technology for organic wastewater treatment and catalyst, which is applied in the fields of energy wastewater treatment, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of fine particle size of titanium dioxide powder, difficult recovery of titanium dioxide, unfavorable light transmission, etc., and achieves bonding strength High, improve sewage treatment effect, easy to combine effect

Active Publication Date: 2016-03-23
HUNAN YONKER ENVIRONMENTAL PROTECTION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Shen Xunwei and others in "The Effect of Persulfate on Photocatalytic Degradation of Phenol in Titanium Dioxide Suspension System" (Journal of Environmental Science Vol. It makes the system turbid, which is not conducive to the transmission of light. Secondly, after the reaction is completed, there is separation of titanium dioxide and wastewater. The particle size of titanium dioxide powder is very fine, which makes separation difficult. In addition, it is difficult to recover titanium dioxide, resulting in increased costs.

Method used

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  • Catalyst for organic wastewater treatment and preparation method thereof

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Embodiment 1

[0029] This embodiment provides a catalyst for organic wastewater treatment and a preparation method of the catalyst. The catalyst uses zeolite with an average particle size of 3 mm as a carrier, and a cobalt-doped composite material layer of about 150 nm is coated on the surface of the zeolite. In the cobalt-doped composite material layer, cobalt is a reinforcement, and the matrix is ​​silica-titania Composite layer, the molar ratio of cobalt to (titanium dioxide + silicon dioxide) is about 1:70; the density of the catalyst is 1.13g / cm 3 .

[0030] The preparation method of this catalyst is as follows:

[0031] a. Put 1000g of zeolite in a calciner at 900°C for 1.5 hours and calcine for 1.5 hours. After cooling, rinse with water to remove soluble salts, and dry at 200°C for later use.

[0032] b. Dissolve cobalt acetate in water to prepare cobalt-containing 0.1M cobalt salt solution, add glacial acetic acid to acidify to pH about 5.5, and prevent cobalt ion precipitation. ...

Embodiment 2

[0037] This embodiment provides a catalyst for organic wastewater treatment and a preparation method of the catalyst. The catalyst uses zeolite with an average particle size of 3 mm as a carrier. On the surface of the zeolite, a silicon dioxide-titania layer of about 100 nm is coated, and then a cobalt-doped composite material layer of about 150 nm is coated. The cobalt-doped Cobalt in the composite material layer is a reinforcement (discontinuous phase), the matrix (continuous phase) is a silica-titania composite layer, and the molar ratio of cobalt to (titanium dioxide + silica) is about 1:150; the density of the catalyst 1.2g / cm 3 .

[0038] The preparation method of this catalyst is as follows:

[0039] a. Put 1000g of zeolite in a calciner at 900°C for 2 hours, then rinse with water after cooling to remove soluble salts, and dry at 200°C for later use.

[0040] b. Add 200mL absolute ethanol to the reactor, add 3.5mL acetylacetone, 6mL glacial acetic acid, stir well, ad...

Embodiment 3

[0047] In order to verify the catalytic effect of the prepared catalyst of embodiment 1 and embodiment 2, carried out catalytic effect experiment and comparison, concrete experiment is as follows:

[0048] The refractory organic wastewater sample was taken from a petrochemical enterprise, COD (chemical oxygen demand) = 1050mg / L, BOD (biological oxygen demand) / COD = 0.12, and the fluorescence dyeing toxicity test was 72%.

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Abstract

The invention discloses a catalyst for organic wastewater treatment and a preparation method thereof. The catalyst is prepared by coating a cobalt-doped composite material layer on a granular silicon-containing carrier. The thickness of the cobalt-doped composite material layer is 100-240 nm. The cobalt-doped composite material layer takes a silicon oxide-titanium oxide composite layer as a base body and cobalt as an enhancer. The molar ratio of the enhancer to the base body in the cobalt-doped composite material layer is 1: (50-200). The molar ratio of silicon oxide to titanium oxide in the silicon oxide-titanium oxide composite layer is 1: (1-3). The catalyst is good in catalytic effect and long in service life.

Description

technical field [0001] The invention relates to a catalyst for organic waste water treatment and a preparation method thereof, belonging to the field of sewage treatment. Background technique [0002] Persulfate advanced oxidation is an effective method developed in recent years to treat refractory organic wastewater. The oxidation mechanism is that under the action of a catalyst, it produces SO with a higher oxidation potential than OH. 4 - , the main catalytic methods are thermal catalysis, photocatalysis and chemical catalysis. Chemical catalysis is mainly based on metal or transition metal ions such as Fe 0 , Fe 2+ 、Co 2+ 、Ce 2+ Wait for activation · SO 4 - . Zhang Shenghan et al. in "Ferrous Sulfate / Potassium Persulfate System Advanced Treatment of Printing and Dyeing Wastewater" (Journal of Donghua University Vol.39N6.P814), Wan Xiaojiao et al. Metal Design and Research Vol.35No.1P33) and the invention patent of Zhang Naidong et al.: 201110149719.8 introduced ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J35/10C02F1/32C02F1/72
CPCY02W10/37
Inventor 贺前锋宋乐山言海燕陈亚利赵迪蔡群欢姚咏歌阙雄杰
Owner HUNAN YONKER ENVIRONMENTAL PROTECTION RES INST
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