阅读说明：本技术 一种降解有机污染物的复合型可见光催化剂 (Composite visible-light-driven photocatalyst for degrading organic pollutants ) 是由 占明军 王爱军 王凤蕊 詹晓芳 刘金库 于 2018-08-09 设计创作，主要内容包括：本发明属于环境化学技术领域,具体涉及一种降解有机污染物的复合型可见光催化剂及其制备方法。本发明利用原位包覆技术和原位光还原方法,获得一种降解有机污染物的复合型可见光催化剂。该纳米复合催化剂催化活性高,化学稳定性好,可广泛应用于水体中多种有机污染物的光降解处理。(The invention belongs to the technical field of environmental chemistry, and particularly relates to a composite visible-light-driven photocatalyst for degrading organic pollutants and a preparation method thereof. The invention obtains a composite visible light catalyst for degrading organic pollutants by utilizing an in-situ coating technology and an in-situ photoreduction method. The nano composite catalyst has high catalytic activity and good chemical stability, and can be widely applied to photodegradation treatment of various organic pollutants in water.)

1. A composite visible light catalyst for degrading organic pollutants comprises a core layer made of aluminum-doped zinc oxide solid solution, a silver molybdate shell layer coated on the surface of the core layer, and silver quantum dots loaded on the surface of the core layer in a photoreduction mode, namely, the silver/silver molybdate @ aluminum-doped zinc oxide solid solution composite visible light catalyst, and the preparation method specifically comprises the following steps: a: mixing aluminum nitrate and glycine according to a certain mass ratio, fully grinding, drying for several hours at a certain temperature, and finally calcining to obtain an aluminum-doped zinc oxide solid solution; b: adding a certain amount of aluminum-doped zinc oxide solid solution into a sodium molybdate and polyvinyl pyrrolidone water dispersion system, placing the system in an ultrasonic disperser, dropwise adding a silver nitrate solution into the system under the ultrasonic dispersing condition, naturally cooling the system to room temperature after reacting for a period of time, washing the system with deionized water, and drying the system in an oven to obtain a silver molybdate @ aluminum-doped zinc oxide solid solution composite material; c: and irradiating the prepared silver molybdate/aluminum doped zinc oxide solid solution composite material under the condition of stirring for a period of time under the ultraviolet light with the power of 8W to obtain the silver/silver molybdate @ aluminum doped zinc oxide solid solution composite visible-light-driven photocatalyst.

Technical Field

The invention belongs to the technical field of environmental chemistry, and particularly relates to a composite visible-light-driven photocatalyst for degrading organic pollutants, a preparation method and application thereof in the environmental field.

Background

The water body pollution, air pollution and the like in life threaten the health of people all the time, how to reduce the pollution and protect the environment become increasingly concerned problems, and the preparation of the photocatalyst for degrading harmful organic matters becomes one of scientific research hotspots in the field of material chemistry. The zinc oxide-based composite catalyst and the nano silver deposited silver molybdate catalyst are paid much attention to due to their safety, non-toxicity and outstanding photocatalytic performance.

According to the invention, the silver/silver molybdate @ aluminum-doped zinc oxide solid solution composite visible-light-driven photocatalyst is prepared by coating the silver molybdate deposited nano silver molybdate catalyst on the aluminum-doped zinc oxide solid solution. Silver, silver molybdate and aluminum-doped zinc oxide have the advantages of safety, no toxicity, stable physical and chemical properties, excellent mechanical properties and the like, and are paid more and more attention by scientific researchers. The invention creatively designs a novel composite visible-light-driven photocatalyst in order to fully exert the performance advantages of the three substances. The composite visible-light-driven photocatalyst aims at improving the catalytic efficiency and the visible-light utilization rate and greatly improves the recovery rate of the composite catalyst.

Disclosure of Invention

The invention aims to provide a composite visible-light-driven photocatalyst for degrading organic pollutants, which is a novel composite visible-light-driven photocatalyst with excellent catalytic performance and convenient recycling, remarkably improves the catalytic effect and the utilization rate of visible light of the catalyst, and also solves the problem that the existing catalyst is difficult to recycle.

The invention provides a composite visible light catalyst for degrading organic pollutants, which comprises the following components of taking an aluminum-doped zinc oxide solid solution as a nuclear layer, coating a silver molybdate shell layer on the surface of the nuclear layer, and loading silver quantum dots on the surface of the nuclear layer in a photoreduction mode, namely the silver/silver molybdate @ aluminum-doped zinc oxide solid solution composite visible light catalyst, wherein the specific preparation steps are as follows: a: mixing aluminum nitrate and glycine according to a certain mass ratio, fully grinding, drying for several hours at a certain temperature, and finally calcining to obtain an aluminum-doped zinc oxide solid solution; b: adding a certain amount of aluminum-doped zinc oxide solid solution into a sodium molybdate and polyvinyl pyrrolidone water dispersion system, placing the system in an ultrasonic disperser, dropwise adding a silver nitrate solution into the system under the ultrasonic dispersing condition, naturally cooling the system to room temperature after reacting for a period of time, washing the system with deionized water, and drying the system in an oven to obtain a silver molybdate/aluminum-doped zinc oxide solid solution composite material; c: and irradiating the prepared silver molybdate @ aluminum doped zinc oxide solid solution composite material under the condition of stirring for a period of time under the ultraviolet light with the power of 8W to obtain the silver/silver molybdate @ aluminum doped zinc oxide solid solution composite visible-light-driven photocatalyst.

According to the invention, the silver molybdate @ aluminum doped zinc oxide solid solution composite material is irradiated under the condition of stirring for 10 to 60 seconds under the ultraviolet light with the power of 8W, and the content of silver at the outermost layer of the visible light composite catalyst is controlled through the photoreduction time.

The invention has the following advantages:

1. the silver/silver molybdate @ aluminum-doped zinc oxide solid solution composite visible light catalyst is designed and synthesized for the first time, the visible light utilization rate is remarkably improved, and the photodegradation efficiency is greatly improved.

2. The composite visible-light-driven photocatalyst prepared by the invention can degrade a plurality of pollutants in water such as methyl orange, methyl blue, bromophenol blue, antibiotics and the like under the condition of visible light.

3. The invention uses polyvinylpyrrolidone in the process of preparing the catalyst, and has the effect of enabling the combination of different components of the composite catalyst to be more compact.

4. The composite visible-light-driven photocatalyst prepared by the invention has the advantages of safety, no toxicity, good physical and chemical properties, excellent photocatalytic performance and the like, and does not cause secondary pollution to the environment.

Detailed Description

The present invention will be further illustrated by the following specific examples.