UV辅助CNT-TiO2活化过硫酸氢盐降解苯酚

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郝学敏,陈硕,王冠龙.UV辅助CNT-TiO2活化过硫酸氢盐降解苯酚[J].,2019,59(6):575-579

UV辅助CNT-TiO2活化过硫酸氢盐降解苯酚

Activation of peroxymonosulfate by CNT-TiO2 under UV-light assistance for degradation of phenol

DOI：10.7511/dllgxb201906004

中文关键词:过硫酸氢盐活化 UV 碳纳米管 TiO2 水处理

英文关键词:peroxymonosulfate activation UV carbon nanotubes TiO2 water treatment

基金项目:城市水资源与水环境国家重点实验室开放基金资助项目(QAK201812).

作者	单位
郝学敏,陈硕,王冠龙

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中文摘要:

通过湿浸渍法制备得到非均相催化剂碳纳米管-二氧化钛(CNT-TiO2)，构建了紫外光(UV)辅助下的CNT-TiO2催化活化过硫酸氢盐(PMS)体系．利用X射线衍射(XRD)和紫外-可见漫反射光谱(DRS)对催化剂进行表征，结果表明复合催化剂中TiO2属于光催化活性较优的锐钛矿晶型，对紫外光(λ<380 nm)有明显吸收．以苯酚作为目标污染物考察该体系的降解性能，结果表明，浓度为10 mg/L的苯酚60 min时降解率可达90%，对应一级动力学常数为0.034 min-1．对复合催化剂中的CNT掺杂量进行优化，结果表明，当CNT质量分数为1.0%时，对应UV/PMS/CNT-TiO2体系降解苯酚效果最优．在反应中，光催化TiO2产生光生电子，电子通过CNT的传递，可增强PMS的活化，进而提高该体系对苯酚的降解能力．

英文摘要:

A UV-light assistance system for activation of peroxymonosulfate (PMS) is constructed with heterogeneous catalyst CNT-TiO2 prepared by a wet impregnation method. The CNT-TiO2 composite is characterized by X-ray diffraction (XRD) and UV-vis diffuse reflectance spectrum (DRS). The results show that TiO2 in the composite is anatase, which has a better photocatalytic activity. The CNT-TiO2 has obvious absorption in the UV region (λ<380 nm). Phenol is selected as the target pollutant to investigate the catalytic degradation performance of the UV/PMS/CNT-TiO2 system. The results show that the removal of phenol (10 mg/L) could be 90% in 60 min, with the first-order kinetic constant being 0.034 min-1. Moreover, the 1.0% doping amount of CNT is optimal for the degradation of phenol in the UV/PMS/CNT-TiO2 system. In the reaction system, electrons could be produced by the photocatalysis process, and photoinduced electrons are transferred through CNT to enhance the activation efficiency of PMS, and then facilitate the degradation of phenol.

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UV辅助CNT-TiO2活化过硫酸氢盐降解苯酚

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