煅烧的ZnWO4催化超声降解藏红T
Sonocatalytic degradation of C.I. Basic Red 2 in the presence of calcined ZnWO4
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摘要: 本文使用水热合成法制备了ZnWO4并进行了高温煅烧，以藏红T（BR2）为降解对象考察了煅烧后ZnWO4催化超声降解有机污染物的活性.结果表明，当煅烧温度为673 K时，ZnWO4具有更好的催化超声降解活性.ZnWO4催化超声降解BR2的主要作用机制是产生的活性氧（ROS）如·OH和·O2-以及空穴（h+）的氧化作用.当煅烧后ZnWO4的加入量为1.5 g·L-1、BR2初始浓度为10 mg·L-1、溶液起始pH值为7、超声功率为200 W、超声时间为120 min、温度为25±0.1℃时，BR2的降解率为90.23%±0.93%.研究结果表明，煅烧可显著提升ZnWO4催化超声降解有机污染物的活性，将为其进一步应用提供研究基础.Abstract: ZnWO4 was prepared by a hydrothermal method and further calcined at different temperatures in this paper. The sonocatalytic degradation activity of calcined ZnWO4 to organic pollutants was studied with C.I. Basic Red 2 (BR2) as the degradation object. The results showed that ZnWO4 had better sonocatalytic degradation activity when calcining temperature was 673 K. The main mechanism was the production of the reactive oxygen species (ROS), such as ·OH and ·O2-, and holes (h+), which were identified and played major roles during the oxidation process. When the addition amount of ZnWO4 was 1.5 g·L-1, the initial concentration of BR2 was 10 mg·L-1, the initial pH was 7, the ultrasonic power was 200 W, the ultrasonic time was 120 min, and the temperature was 25±0.1 ℃, the degradation ratio of BR2 was 90.23%±0.93%. The results showed that calcination could significantly improve the sonocatalytic degradation activity of ZnWO4 to organic pollutants, which would provide research basis for its further application.
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Key words:
- ZnWO4 /
- C.I.Basic Red 2(BR2) /
- calcination /
- sonocatalytic degradation
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