Preparation of Diatomite-Based Composite Photocatalyst and Its Application in the Xanthate Degradation
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摘要:
为了实现对浮选废水中残留黄药的高效降解，首先采用油浴沉淀法制备了TiO2/硅藻土二元复合光催化剂，考察了TiO2负载量和H2O2添加量对所获产物在紫外光照射条件下对黄药降解性能的影响。在经优化得到的二元复合光催化剂的基础上，又采用水浴沉淀法制备得到BiOCl/TiO2/硅藻土三元复合光催化剂，考察了BiOCl负载量对三元复合光催化剂降解黄药性能的影响。研究结果表明，当TiO2与硅藻土的质量比为1 GA6FA 5、质量分数为30%的H2O2添加量为2 mL时，所获二元复合光催化剂的降解性能最佳，在60 min内对黄药的降解率可以达到近60%；当BiOCl与TiO2及硅藻土的质量比为1 GA6FA 2 GA6FA 10时，三元复合光催化剂表现出最佳的光降解黄药性能，在90 min内对黄药的降解率可以达到90%以上。与二元复合光催化剂相比，BiOCl/TiO2/硅藻土三元复合光催化剂不仅实现了对黄药的降解从较高能量的紫外光拓宽至可见光，而且表现出更加优异的降解黄药性能，具有潜在的实际应用前景。
Abstract:In order to achieve effective degradation of residual xanthate in flotation wastewater, TiO2/diatomite binary composite photocatalyst was firstly prepared by oil bath precipitation method, and the effects of TiO2 loading amount and H2O2 addition amount on the xanthate degradation performance of the product were investigated under the UV irradiation. Based on the optimized binary composite photocatalyst, BiOCl/TiO2/diatomite ternary photocatalyst was then prepared by water bath precipitation method, and the effect of BiOCl loading amount on the xanthate degradation performance of the ternary photocatalyst was explored. The results showed that the binary composite photocatalyst possessed the optimal degradation performance to xanthate when the mass ratio of TiO2 to diatomite was 1 GA6FA 5 and the amount of H2O2 with the concentration of 30% was 2 mL. The degradation efficiency of xanthate was about 60% within 60 min under the condition. Furthermore, the ternary photocatalyst showed the optimal photodegradation performance to xanthate when the mass ratio of BiOCl to TiO2 and diatomite was 1 GA6FA 2 GA6FA 10. The degradation efficiency of xanthate could reach more than 90% within 90 min under the circumstance. Compared with the binary composite photocatalysts, BiOCl/TiO2/diatomite ternary photocatalysts can not only achieve the degradation of xanthate from higher energy UV light to common visible light, but also show better degradation performance of xanthate, showing the potential practical application prospect.
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Key words:
- diatomite /
- TiO2 /
- BiOCl /
- composite photocatalyst /
- xanthate degradation
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