光催化降解活性染料K-GL的动力学及其盐效应  

Investigation into salt effect and kinetics of photocatalytic degradation of reactive dye K-GL

作　　者：汤善康[1,2] 耿启金[1] 刘刚[1] 王笑[1] 杨认武 

机构地区：[1]潍坊学院化学化工与环境工程学院,山东潍坊261061 [2]北京金隅红树林环保技术有限责任公司,北京100013

出　　处：《化工进展》2014年第7期1908-1912,共5页Chemical Industry and Engineering Progress

基　　金：潍坊学院博士基金(2012BS07);山东省自然科学基金(ZR2011BM019);教育厅山东省高等学校科技计划(J11LB55);潍坊市科技局科研项目(201201284)

摘　　要：以分散态纳米TiO2为光催化剂,在鼓泡流化床光催化反应器中对活性翠兰K-GL染料溶液进行光催化降解实验研究。通过改变光催化剂投入量、染料溶液的初始浓度和Na2SO4与NaCl的掺加,探讨了影响光催化降解K-GL的因素,运用Langrmuir-Hinshelwood动力学方程对染料降解动力学规律进行了研究。结果表明,TiO2光催化降解活性翠兰K-GL的反应遵循准一级反应动力学方程,且表观反应速率表常数随活性翠兰溶液初始浓度的升高而降低;反应的催化剂最佳投入量为0.122g/L;光催化体系中的Na2SO4对于染料K-GL的降解表现出明显的促进作用,在较低浓度下,Na2SO4的最佳添加量为0.104mol/g,且随着其浓度的升高,表观反应速率常数随之增大;而掺加不同浓度的NaCl对光催化降解K-GL有抑止作用。Nanometer TiO2 dispersed in water was used as photocatalyst in a self-designed bubbling fluidized bed photocatalytic reactor（BFBPR）. Photocatalytic degradation kinetics of reactive turquoise blue K-GL in BFBPR was investigated by considering the dosage of photocatalyst,initial dye concentration,ionic strength of NaCl and Na2SO4. Furthermore,the Langrmuir-Hinshelwood kinetics equation was used to describe the photocatalytic degradation kinetics of dye K-GL. The photocatalytic degradation of reactive turquoise blue K-GL reaction followed a pseudo-first order kinetics equation,and the apparent reaction rate coefficient decreased with increasing initial dye concentration. The optimal catalyst amount was 0.122g/L. Addition of Na2SO4 promoted photocatalysis of K-GL at lower dye concentrations with the optimal addition of 0.104mol/g. In addition,the apparent reaction rate coefficient increased with increasing addition of Na2SO4,while the photocatalysis was inhibited with increasing addition of NaCl.

关 键 词：光催化 降解 废水 动力学 盐效应 

分 类 号：X703.1[环境科学与工程—环境工程]