阅读说明：本技术 一种有机化合物废水处理的复合光催化 (Composite photocatalysis for organic compound wastewater treatment ) 是由 那平 李萌 骆艳芳 韩晴玉 于 2020-07-07 设计创作，主要内容包括：本发明公开了一种有机化合物废水处理的复合光催化剂,本发明通过水热法一步合成复合光催化剂基体物质CdLa2S4,并通过煅烧的方法制备外貌规整的复合光催化剂,该复合光催化剂可以在紫外光照射下催化降解有机化合物废水,特别是含氮类有机化合物废水的效率高。(The invention discloses a composite photocatalyst for organic compound wastewater treatment, which is prepared by synthesizing a composite photocatalyst matrix substance CdLa2S4 in one step by a hydrothermal method and preparing the composite photocatalyst with regular appearance by a calcination method.)

1. Calcining SiC powder at the high temperature of 300-900 ℃, and then soaking in HF solution to prepare SiC suspension;

and (2) separating the SiC suspension prepared in the step (1), and washing and drying the solid obtained by separation to prepare a SiC sample.

2. The method according to claim 1, wherein the temperature in step (1-1) is 120 to 165 ℃.

Technical Field

The invention relates to the field of wastewater treatment, in particular to a composite photocatalyst for organic compound wastewater treatment.

Background

1. In recent years, with the rapid development of industrial production, the problem of environmental pollution has been receiving general attention. With the continuous improvement of the technology for treating industrial pollution, the research of the photocatalytic technology, namely the photocatalytic degradation technology for pollutants by utilizing solar energy, on the aspect of environmental treatment is more and more intensive.

2. Another way to study photocatalysts is to find new photocatalysts. At present, the development of semiconductor compounds for photocatalysis is no longer to search for semiconductor compounds existing in nature, but tends to artificially synthesize semiconductor compounds such as CdLa2S4, etc., however, the photocatalytic efficiency of the compound used as photocatalyst is not high.

3. Therefore, there is a need to develop a composite photocatalyst which has good photocatalytic effect for reducing organic compound wastewater treatment.

Disclosure of Invention

The invention discloses a composite photocatalyst for organic compound wastewater treatment, which is prepared by synthesizing a composite photocatalyst matrix substance CdLa2S4 in one step by a hydrothermal method and preparing the composite photocatalyst with regular appearance by a calcination method.

To achieve the purpose, the invention provides a composite photocatalyst for preparing organic compound wastewater treatment, which comprises the following components in percentage by weight: the composite photocatalyst comprises SiC and CdLa2S4, wherein the weight fraction of the SiC is 0.1-20% based on the weight of CdLa2S4, and the method is characterized by comprising the following steps:

1. the preparation of CdLa2S4 comprises the following substeps:

(1-1) placing Cd (NO3) 2.4H 2O, La (NO3) 3.6H 2O and thiourea into water, wherein the molar amount of Cd (NO3) 2.4H 2O is the molar amount of Cd elements, the molar amount of La (NO3) 3.6H 2O is the molar amount of La elements, and the molar amount of thiourea is the molar amount of S elements, and the ratio of the molar amount of Cd (NO3) 2.4H 2O to the molar amount of La (NO3) 3.6H 2O to the molar amount of thiourea is Cd (NO3)24H2O: La (NO3) 3.6H 2O: thiourea ═ 1-2-3) (4: 8), and carrying out a constant temperature reaction at a high temperature of 100-170 ℃ to prepare a precipitate;

(1-2) separating the precipitate prepared in the step (1-1) from a reaction system, washing and drying to obtain a CdLa2S4 sample;

2. the preparation method of the composite photocatalyst SiC/CdLa2S4 comprises the following substeps:

(2-1) respectively weighing the CdLa2S4 prepared in the step (1) and SiC, mixing and grinding, and placing the ground mixed powder into a container containing a solvent;

(2-2) removing the solvent, drying, calcining at the temperature of 300-900 ℃, and cooling to obtain the composite photocatalyst SiC/CdLa2S 4.

Preferably, the method further comprises the following steps after the step (1) and before the step (2).

Pretreatment of SiC, the step comprising the substeps of:

(1) calcining SiC powder at the high temperature of 300-900 ℃, and then soaking in HF solution to prepare SiC suspension;

(2) and (2) separating the SiC suspension prepared in the step (1), and washing and drying the solid obtained by separation to prepare a SiC sample.

Preferably, in the step (1-1), the temperature is 120-165 ℃.

Detailed Description

The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.

A preparation method of a composite photocatalyst SiC/CdLa2S4 for organic compound wastewater treatment comprises SiC and CdLa2S4, wherein the weight percentage of SiC is 0.1-20% based on the weight of CdLa2S4,

the method is characterized by comprising the following steps:

1. the preparation of CdLa2S4 comprises the following substeps:

(1-1) placing Cd (NO3) 2.4H 2O, La (NO3) 3.6H 2O and thiourea into water, placing Cd (NO3) 2.4H 2O into water, placing Cd (NO3) 3.6H 2O into water, placing Cd (NO3) 2.4H 2O into water, placing La (NO3) 3.6H 2O into water, placing the molar quantity of thiourea into a constant temperature reaction at a high temperature of 100-170 ℃, wherein the molar quantity of Cd (NO3) 2.4H 2 is larger than the molar quantity of Cd, the molar quantity of La (NO3) 3.6H 2O is larger than the molar quantity of La (NO3) 3.6H 2O, and the molar quantity of thiourea is larger than the molar quantity of S, and placing the constant temperature reaction is carried out at a constant temperature of 100-170 ℃;

(1-2) separating the precipitate prepared in the step (1-1) from a reaction system, washing and drying to obtain a CdLa2S4 sample;

2. the preparation method of the composite photocatalyst SiC/CdLa2S4 comprises the following substeps:

(2-1) respectively weighing the CdLa2S4 prepared in the step (1) and SiC, mixing and grinding, and placing the ground mixed powder into a container containing a solvent;

(2-2) removing the solvent, drying, calcining at the temperature of 300-900 ℃, and cooling to obtain the composite photocatalyst SiC/CdLa2S 4.

After the step (1) and before the step (2), the method further comprises the following steps:

pretreatment of SiC, the step comprising the substeps of:

(1) calcining SiC powder at the high temperature of 300-900 ℃, and then soaking in HF solution to prepare SiC suspension;

(2) and (2) separating the SiC suspension prepared in the step (1), and washing and drying the solid obtained by separation to prepare a SiC sample.

In the step (1-1), the temperature is 120-165 ℃.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, the techniques of the art

Additional embodiments of the invention will occur to those skilled in the art without the need for inventive faculty, and such embodiments will fall within the scope of the invention.