改性二氧化钛紫外光催化降解孔雀石绿的动力学  

Photo-catalysis Degradation Kinetics of Modified Titanium Dioxide to Malachite Green under UV-light

作　　者：张一兵[1] 涂吕英 李兵妹 

机构地区：[1]上饶师范学院化学化工学院,上饶334001

出　　处：《硅酸盐通报》2015年第2期364-369,共6页Bulletin of the Chinese Ceramic Society

基　　金：教育部第四批高等学校特色专业建设点资助项目(TS11524);江西省省级精品课程资助项目(2011-74);江西省高校教学团队资助项目([2008]100)

摘　　要：用水热法制得了掺杂改性的二氧化钛粉末,通过XRD测定了产物的晶型,研究了以自制产物对孔雀石绿紫外光催化的降解过程。通过考察降解物的初始浓度、p H值、二氧化钛的用量和掺铁量对光催化降解速率的影响,研究改性二氧化钛光催化孔雀石绿的动力学行为;结果显示:孔雀石绿溶液初始浓度为2 mg/L(p H=9)、二氧化钛用量为1.6 g/L和其掺铁量为8%(摩尔分数)、室温下紫外光照(λ=365 nm)反应4 h,孔雀石绿的降解率D%(80.11%)和表观反应速率常数k达到最大值0.3196 h-1。降解反应相符于L-H动力学方程,光催化过程为拟一级反应。Modified titanium dioxide powders are prepared via hydrothermal method and were characterized by means of XRD,kinetics of as-prepared photo-catalyzer photo-catalyzing malachite green are researched by analysis of the influence of the malachite green initial concentration,the p H value,the catalyst dosage and the amount of iron-doping in titanium dioxide on photo-catalytic degradation speed. The results show that the decolorization rate D%（ 80. 11%） and degradation observed rate constant k（ 0. 3196 h- 1） of malachite green achieve maximum under follow conditions： a malachite green＇s initial concentration 2 mg /L（ p H = 9）,a catalyst dosage 1. 6 g / L,an amount of iron-doping 8%（ mole fraction）,and an irradiating with ultraviolet light（ λ = 365 nm） time 4 h at room temperature. The photo-catalytic degradation of malachite green conforms to the rule of Langmuir-Hinshelwood（ L-H） kinetics and follows the first-order reaction.

关 键 词：改性二氧化钛 光催化 降解 孔雀石绿 动力学 

分 类 号：X703[环境科学与工程—环境工程]