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Self-gravity-driven, high-throughput coal-ldh and coal-ldo catalytic membranes and preparation methods thereof

A coal-ldh and coal-ldo technology, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low utilization of catalytic active sites, poor catalytic efficiency, and easy loss of catalysts Problems such as reusability, to achieve the effect of facilitating large-scale promotion, solving the loss of catalysts, and overcoming the narrow suitable range

Active Publication Date: 2021-12-17
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defects of low utilization rate of catalytic active sites, easy loss of catalyst, poor reusability and poor catalytic efficiency in the application of heterogeneous catalysis in water treatment process, the present invention proposes a self-gravity-driven, high-pass A large amount of CoAl-LDH catalytic membrane and its preparation method and a self-gravity-driven, high-flux CoAl-LDO catalytic membrane and its preparation method, by loading the catalysts CoAl-LDH and CoAl-LDO on the membrane, the preparation can A gravity-driven catalytic membrane that efficiently degrades emerging pollutants such as PPCPs, and realizes the application of degradation of PPCPs under the self-gravity drive of faucet water

Method used

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  • Self-gravity-driven, high-throughput coal-ldh and coal-ldo catalytic membranes and preparation methods thereof
  • Self-gravity-driven, high-throughput coal-ldh and coal-ldo catalytic membranes and preparation methods thereof
  • Self-gravity-driven, high-throughput coal-ldh and coal-ldo catalytic membranes and preparation methods thereof

Examples

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preparation example Construction

[0053] A preferred embodiment of the present invention proposes a self-gravity-driven, high-throughput cobalt-aluminum layered double hydroxide (CoAl-LDH) and cobalt-aluminum layered oxide (CoAl-LDO) catalytic membrane preparation method, Include the following steps:

[0054] S1: take a certain quality of cobalt nitrate and aluminum chloride and dissolve it in ultrapure water to make solution A, take a certain quality of sodium hydroxide and sodium carbonate and dissolve it in ultrapure water to make solution B;

[0055] Wherein, the ratio of the amount of the metal substance of the Co salt and the Al salt is (1-3):1.

[0056] S2: Mix solution A and solution B under strong stirring conditions, and continue to stir for a period of time, transfer the mixed solution to a 100ml hydrothermal reaction kettle, place it in a constant temperature environment heated to a certain temperature, and continue to react for several hours;

[0057] Among them, magnetic stirring is preferably u...

Embodiment 1

[0074] (1) Prepare 30ml of mixed solution of 0.6mol / L cobalt nitrate hexahydrate and 0.3mol / L aluminum chloride, and stir for 10min.

[0075] (2) Prepare 30ml of a mixed solution of 1.92mol / L sodium hydroxide and 0.8mol / L sodium carbonate, stir for 10min, and return to room temperature.

[0076] (3) The two solutions were mixed under vigorous stirring, and after stirring for 20 minutes, they were transferred to a 100ml hydrothermal reaction kettle, placed in an oven preheated to 130°C, and continued to react for 18 hours.

[0077] (4) The obtained product was centrifuged and washed 3 times at high speed with deionized water and ethanol to remove excess impurities or organic matter on the surface.

[0078] (5) Dry the product in an oven at 60°C for 12 hours, then grind it in an agate mortar, transfer it to a dispersion of ethanol:water = 1:1, and ultrasonicate for 90 minutes to obtain 1g / L CoAl - LDH stock solution.

[0079] (6) Take 1ml of CoAl-LDH stock solution and dispers...

Embodiment 2

[0081] The difference from LDH-Example 1 is that the amount of CoAl-LDH stock solution in step (6) is 5ml, that is, the CoAl-LDH loading capacity of the prepared catalytic membrane is 0.4mg / cm 2 , compared with LDH-Example 1, has a different catalyst loading, and a different film thickness.

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Abstract

The invention discloses a self-gravity-driven, high-flux CoAl-LDH and CoAl-LDO catalytic membrane and a preparation method thereof, wherein the preparation method of the CoAl-LDH catalytic membrane comprises: weighing a predetermined amount of cobalt salt and aluminum salt to dissolve The first solution is prepared in pure water, and a predetermined amount of sodium hydroxide and sodium carbonate are weighed and dissolved in pure water to prepare a second solution; the first solution and the second solution are mixed under stirring conditions, and then heated by hydrothermal The powder is heated to a predetermined temperature for several hours; then centrifugal washing, drying, and grinding are performed to obtain powder; the powder is placed in an ethanol solution, and ultrasonically dispersed for at least 1 h to obtain a stock solution; an ultrafiltration membrane is prepared, and the ultrafiltration membrane Soak in pure water, take the stock solution and disperse it in pure water, filter it on an ultrafiltration membrane with vacuum suction, and dry it to obtain a CoAl-LDH catalytic membrane. The CoAl-LDH and CoAl-LDO catalytic films prepared by the invention can realize the efficient degradation of pollutants under the driving of self-gravity.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a self-gravity-driven, high-flux CoAl-LDH catalytic membrane and a preparation method thereof, and a self-gravity-driven, high-flux CoAl-LDO catalytic membrane and a preparation method thereof. Background technique [0002] Since the 21st century, with the maturity of traditional water treatment technology, people's main focus has gradually shifted from the control of nutrients such as nitrogen and phosphorus to water quality security. With the development and progress of environmental analysis technology, the types of pollutants that humans can detect are increasing. For example, emerging pollutants such as pharmaceuticals and personal care products (PPCPs) are harmful due to their low content and are difficult to effectively remove through conventional treatment technologies. Serious threat to water quality safety, and has been widely concerned. [0003] In order to en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J37/10B01J37/12B01J35/06C02F1/72C02F1/44
CPCB01J23/75B01J37/10B01J37/12C02F1/725C02F1/44B01J35/59
Inventor 张正华康鸿宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV