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Preparation method of ternary oxide ozone catalyst for advanced treatment of wastewater

A ternary oxide, advanced treatment technology, applied in the field of environmental catalysis and water treatment, can solve the problems of low utilization rate of substrate pores and easy agglomeration of active components, so as to improve the utilization rate of ozone, increase the depth of immersion, and reduce deactivation. effect of phenomenon

Inactive Publication Date: 2021-07-16
河北德龙环境工程股份有限公司
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Problems solved by technology

[0006] Aiming at the problems of existing supported ozone catalysts such as easy aggregation of active components and low utilization rate of substrate pores, the present invention provides a γ-Al 2 o 3 The preparation method of the ternary Fe, Cu, La oxide ozone oxidizer as the carrier, by introducing a promoter with metal coordination ability in the catalyst preparation process, can improve the efficiency of the ternary Fe, Cu, La metal ions immersing into the substrate , it can also reduce the agglomeration phenomenon between metal ions

Method used

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  • Preparation method of ternary oxide ozone catalyst for advanced treatment of wastewater
  • Preparation method of ternary oxide ozone catalyst for advanced treatment of wastewater
  • Preparation method of ternary oxide ozone catalyst for advanced treatment of wastewater

Examples

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Embodiment 1

[0029] A preparation method for a ternary oxide ozone catalyst for advanced treatment of wastewater, the steps of which are as follows:

[0030] Gamma-Al with a particle size of 2-5mm and a weight of 100g 2 o 3 The carrier is soaked with 10% dilute nitric acid solution by weight to ensure that the liquid fully infiltrates the carrier. The soaking time is 12 hours. After soaking, it is cleaned with deionized water until the pH is basically unchanged, then transferred to the oven for drying, and set aside;

[0031]Use ethylenediaminetetraacetic acid as a metal ion accelerator, add it to a certain volume of deionized water, and after it is fully dissolved, add ferric nitrate, copper nitrate and lanthanum nitrate to the above solution in sequence, and then prepare the impregnation reserve liquid. Wherein, the weight of each component of the impregnation stock solution: ethylenediaminetetraacetic acid, iron nitrate, manganese nitrate and deionized water are respectively 5g, 15g, ...

Embodiment 2

[0043] The ozone catalyst used for water treatment in Example 1 and Comparative Example 1 was collected, washed, dried and transferred to a muffle furnace at 300 ° C for 2 hours and calcined, then cooled and taken out and used for the treatment of simulated dye wastewater, and the degradation test was maintained. The conditions are the same as in Example 1. The above two catalysts were subjected to 10 repeated degradation tests, and the test results were as follows Figure 4 The results show that compared with the traditional impregnation process, which easily leads to the agglomeration of catalytic species on the surface of the carrier, the introduction of metal ion promoters in the catalyst preparation process helps to improve the uniform dispersion of active species, increase the number of catalytic ozone active sites, and accelerate ozone. Catalytic oxidation efficiency, even after 10 repeated tests, the ozone catalyst prepared by the invention still has the performance of...

Embodiment 3

[0045] Based on the cyclic test carried out in Example 2, the third cyclic degradation experiment was selected, after taking out 5 mL of the reaction solution at different time periods, respectively, transferred to a 10 mL colorimetric tube, and successively added 1 mL of hydroxylamine hydrochloride with a concentration of 1 g / L, 2 mL of acetic acid with a concentration of 1 mol / L and 2 mL of a solution of o-phenanthroline with a concentration of 1 g / L were allowed to stand for 15 min, and the total iron content dissolved in the reaction solution was measured by spectrophotometry at a wavelength of 510 nm. The experimental results are as image 3 As shown, after 60 min of degradation experiment, FeCuLaOx / Al 2 O 3 The total dissolved iron ion in the catalytic system reaches 0.19mg / L, which is much higher than Fe 2 O 3 -CuO-La 2 O 3 / Al 2 O 3 0.08mg / L in the catalytic system. FeCuLaOx / Al 2 O 3 The loss of excess active components in the catalytic system confirms a redu...

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Abstract

The invention discloses a preparation method of a ternary oxide ozone catalyst for advanced treatment of wastewater. The invention aims to solve the problems of easy aggregation of catalytic active components and low utilization rate of substrate pore channels in traditional preparation methods of alumina-based ozone catalysts. The preparation method of the catalyst comprises the following steps: a, soaking gamma-Al2O3 with the diameter of 2-5mm in dilute nitric acid for 12 hours, filtering, taking the gamma-Al2O3 out, cleaning with deionized water until the PH is not changed, and drying for later use; b, preparing an iron, copper and lanthanum ternary nitrate stock solution containing a certain concentration of a metal ion accelerant; c, adding the gamma-Al2O3 dried in the step a into the prepared stock solution, and dipping for 24 hours; and d, filtering out the impregnated gamma-Al2O3, cleaning, drying, and finally roasting at high temperature to obtain the alumina-based ozone catalyst with uniformly dispersed active substances. The ozone catalyst provided by the invention has the advantages of thick catalytic layer and good dispersibility of active components, and the method is simple in preparation process, low in cost and easy for engineering macro preparation.

Description

technical field [0001] The invention relates to the fields of environmental catalysis and water treatment, in particular to a preparation method of a ternary oxide ozone catalyst used for advanced treatment of wastewater. Background technique [0002] my country's water resources are scarce. After decades of rapid economic development, the tight supply and demand of water resources has become more prominent. Water resource problems such as overexploitation, water source depletion, water pollution, and water ecosystem damage are continuously restricting my country's economy and Social development. In this context, it is the current development trend to realize the advanced treatment and reuse of effective sewage and improve the efficiency of water resource utilization. At present, although the techniques including physical and chemical methods, biological methods, chemical methods, and membrane methods used in my country can basically meet the treatment needs of general light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C02F1/78
CPCB01J23/83C02F1/78
Inventor 柳玉肖毛旭辉朱子强赵建力王智成刘卫静
Owner 河北德龙环境工程股份有限公司
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