摘要
通过固体扩散法将纳米TiO2负载在疏水沸石上制成复合光催化剂.研究了不同配比的复合光催化剂在32 W紫外灯照射下对水中土霉素的去除效果,探讨了复合光催化剂投加量、土霉素初始质量浓度、初始pH值对降解效果的影响.结果表明,质量分数为40%的纳米TiO2和质量分数为60%的疏水沸石制成的复合光催化剂在UV(紫外线)照射下对土霉素具有最佳的去除效果,对于初始质量浓度为50mg.L-1的土霉素水溶液,复合光催化剂投加500mg.L-1,UV照射150min即可将土霉素去除99%以上,UV照射6h,溶液的总有机碳(TOC)可去除86%.土霉素初始质量浓度越低,降解速度越快,随着pH值的提高,其降解速率常数逐渐增大.
The composite photocatalysts were made by solid dispersion method with hydrophobic Zeolite and nanometer titanium dioxide.The removal of oxytetracycline（OTC） in water by UV/ Hydrophobic Zeolite loaded with different ratio of TiO2 was investigated respectively under the irradiation of 32 W low-pressure mercury lamps.The effects of composite photocatalyst quantity,initial OTC concentration and pH were studied.Results show that UV/composite photocatalyst with 40% TiO2 and 60% hydrophobic Zeolite is the best way to remove OTC in water compared to the others. 99% of OTC （50 mg ·L^-1 ） in ultrapure water mixed with 500 mg ·L^-1 composite photocatalyst degrades within 150 min under UV irradiation. And after 6 hours, 86% TOC of the OTC solution is removed. It is found that the degradation rate is quicker when the OTC initial concentration is lower and initial pH is higher.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第10期1360-1365,共6页
Journal of Tongji University:Natural Science
基金
建设部水体污染控制与治理科技重大专项资助项目(2008ZX07425-007)
关键词
水环境
土霉素
光催化氧化
纳米二氧化钛
疏水沸石
water environment
oxytetracycline
photocatalysis
nanometer titanium dioxide
hydrophobic zeolite
作者简介
赵纯（1982-），男，博士生，主要研究方向为光催化水处理理论与技术．E-mail：pureson@163．com
邓慧萍（1964-），女，教授，博士生导师，工学博士，主要研究方向为给水处理理论与技术．E-mail：denghuiping@sina.com
