B掺杂对负载型TiO2光催化剂脱硝性能的影响  

Effect of B doping on DeNO_x performance of supported TiO_2 photocatalyst

作　　者：陈雷 孙圣楠[1] 王亮[1] 冯丽娟[1] 王文泰[1] 胡保革 李春虎[1] Chen Lei;Sun Shengnan;Wang Liang;Feng Lijuan;Wang Wentai;Hu Baoge;Li Chunhu(The Ministry of Education Key Laboratory of Marine Chemistry Theory and Technology,College of Chemistry and Chemical Engineering,Ocean University of China,Qing Dao 266100,Shandong,China)

机构地区：[1]中国海洋大学化学化工学院,教育部海洋化学理论与技术重点实验室,山东青岛266100

出　　处：《工业催化》2018年第11期29-35,共7页Industrial Catalysis

基　　金：国家自然科学基金(51602297)资助项目;山东省重点研发计划(2016ZDJS11A04);燃煤锅炉烟气光催化与H2O2氧化脱硫脱硝中试技术研究与开发(17-3-3-71-nsh);燃煤锅炉烟气光催化与H2O2氧化脱硫脱硝中试技术研究与开发(20173702021476);高浓度有机废水吸附剂(活性焦)生产工艺开发(20170093)

摘　　要：采用超声辅助溶胶-凝胶法制备活化半焦负载B掺杂TiO_2光催化剂,即B-TiO_2/ASC。在相同实验条件下,分别在紫外和可见光下研究其对模拟烟气的光催化氧化脱硝性能。结果表明,在紫外和可见光下,B掺杂光催化剂的活性得到提高,在可见光下的活性增加更加显著,反应180 min后仍可保持80%以上的脱硝率。结合XRD和FT-IR分析,可以看出B以取代掺杂的方式存在于TiO_2中并且导致TiO_2表面缺陷。表面缺陷有助于光生载流子的分离,从而延长光生电子的寿命并增加参与光催化反应的光生电子数量,从而产生更多的羟基自由基氧化NO,最终提高光催化脱硝率。B-doped TiO2 photocatalyst supported on activated semi-coke,namely B-TiO2/ASC,was prepared by ultrasonic-assisted sol-gel method. Under the same experimental conditions,photocatalytic activities for NO removal was studied under UV and visible light irradiation,respectively. The results showed that under UV and visible light irradiation,activity of B-doped catalysts was improved,activity under visible light irradiation increased more significantly,and NO removal efficiency could still maintained over 80% after 180 min reaction. X-ray diffraction and FT-IR spectra results indicated that B got into TiO2 lattice by substitution doping and caused TiO2 surface defects. Surface defects contributed to the separation of photogenerated carriers,thereby prolonged the lifetime of photo-generated electrons and increased the number of photo-generated electrons involved in photocatalytic reactions,generated more hydroxyl radicals to oxidize NO,and ultimately increased photocatalytic denitration efficiency.

关 键 词：催化化学 光催化脱硝 B掺杂TiO2 活化半焦 溶胶-凝胶法 

分 类 号：O643.36[理学—物理化学] TQ034[理学—化学]