文章摘要
UV辅助CNT-TiO2活化过硫酸氢盐降解苯酚的研究
Activation of peroxymonosulfate by CNT-TiO2 under UV-light assistance for the degradation of phenol
投稿时间:2019-04-18  修订日期:2019-05-16
DOI:
中文关键词: 过硫酸盐活化  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(QAK201812)
作者单位E-mail
郝学敏 大连理工大学 hxm_mx@163.com 
陈硕 大连理工大学 shuochen@dlut.edu.cn 
王冠龙   
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中文摘要:
      本研究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(UV<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分钟时降解率可达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 wt.%时,对应UV/PMS/CNT-TiO2反应体系降解苯酚效果最优。在反应中,光催化TiO2产生光生电子,电子通过碳纳米管(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 CNT-TiO2 has obvious absorption in the UV region (UV<380 nm). The TiO2 in the composite is anatase, which has a better photocatalytic activity. 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 wt.% 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.
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