摘要
以溶胶凝胶法制备出具有较高光催化活性和易于分离回收的TiO2/磁性海泡石复合催化剂,研究了不同因素对该复合催化剂光催化处理Cr(Ⅵ)/2,4-二氯酚复合废水效果的影响。结果表明,在催化剂投加量为2 g/L,初始p H为2,光照75 min时,该复合光催化剂对复合废水中Cr(Ⅵ)和2,4-二氯酚的去除率均可达90%以上,同时发现对复合废水中Cr(Ⅵ)的去除率比单一Cr(Ⅵ)废水提高了69.4%,而对复合废水中2,4-二氯酚的去除率比单一2,4-二氯酚废水仅提高6%,表明复合光催化剂处理复合废水以催化氧化反应为主,在2,4-DCP催化氧化过程中可大大促进Cr(Ⅵ)的还原。
The TiO2/magnetic-sepiolite （TiO2/MMS） composite photocatalyst with high photoeatalytie activity and easy separation was prepared by sol-gel method. Factors affecting the composite photocatalyst were studied in photocatalytic treamaent ofCr （VI）/2,4-dichlorophenol （2,4-DCP） composite waste water. The results indicated that the removal efficiency of Cr（VI） and 2,4-DCP in composite wastewater by the composite photocatalyst reached more than 90% after lighting for 75 minutes, under the condition that the initial pH being 2 and the dosage of TiOJMMS was 2 g/L. The removal efficiency of Cr （VI） in composite wastewater by the composite photocatalyst was 69.4% higher than that in single Cr （VI） wastewater while the removal efficiency of 2,4-DCP was only 6% higher than that in single 2,4-DCP wastewater. It was indicated that the composite photocatalyst on the removal of composite wastewater was the result of oxidation from 2, 4-DCP. The catalytic oxidation process of 2, 4-DCP could greatly promote the reduction ofCr （VI）.
出处
《水处理技术》
CAS
CSCD
北大核心
2015年第6期43-45,51,共4页
Technology of Water Treatment
基金
国家水体污染控制与治理科技重大专项(2010ZX07212-008)
湖南省高校创新平台开放基金项目(11k070)
湖南省科技厅项目(2013FJ3071)
