紫外光光强对TiO_2-膨润土降解十二烷基苯磺酸钠的影响  

Effect of intensity of ultraviolet light on degradation of sodium dodecyl benzene sulfonate by TiO_2-bentonite

作　　者：温淑瑶[1] 马敏立[2] 陈素云[3] 马占青[4] 

机构地区：[1]北京师范大学地理学与遥感科学学院,北京100875 [2]北京市十一学校,北京100039 [3]北京市勘察设计研究院有限公司,北京100038 [4]杭州职业技术学院化学工程系,浙江杭州310018

出　　处：《实验技术与管理》2011年第9期35-38,共4页Experimental Technology and Management

基　　金：国家基础科学人才培养基金项目资助(J0630532)

摘　　要：在室温、电磁搅拌和6W紫外灯（距静止液面距离分别为6.5 cm、18.5 cm、30.5 cm和42.5 cm）的不同光强（在静止液面处的光强分别为700-750μW/cm2、300-310μW/cm2、200-210μW/cm2和110-120μW/cm2）,及太阳光的不同紫外光强度照射条件下,质量分数为0.5‰的纳米TiO2-膨润土复合光催化剂对初始质量浓度为20 mg/L的十二烷基苯磺酸钠（SDBS）溶液中SDBS的降解反应表明：光强对SDBS降解的影响较大,光强越强SDBS的降解率越高、溶液的COD值降低率越大;不同光强下,TiO2-膨润土对SDBS降解反应为一级反应,符合Langmuir-Hinshelwood方程;随着光强的增大,TiO2-膨润土对SDBS降解的光催化反应速率常数增大。Different intensities of ultroviolet light（700～750 μW/cm2,300～310 μW/cm2,200～210 μW/cm2 and 110～120 μW/cm2）resulted from different distances（6.5 cm,18.5 cm,30.5 cm and 42.5 cm） between 6 W ultroviolet light and still solution surface respectively.Original concentration of sodium dodecyl benzene sulfonate（SDBS） was 20mg/L.Under the same condition（temperature,ultraviolet light shining period,electromagnetic mixing,Ph 6） and different intensities of light,the results of degradation reaction of SDBS by 0.5 TiO2-bentonite show that the effect of intensity of light on degradation is obvious.The higher the intensity of ultroviolet light,the more the SDBS was degradated.The higher the intensity of ultroviolet light,the more the chemical oxide demand of solution decreased.The degradation reaction was first-order reaction.Its law of dynamics accorded with Langmuir-Hinshelwood equation.The higher the intensity of ultroviolet light,the bigger the speed coefficient of photocatalytic reaction between SDBS and TiO2-bentonite.

关 键 词：十二烷基苯磺酸钠 紫外光 降解 二氧化钛-膨润土 光强 

分 类 号：TQ426.1[化学工程] X131.2[环境科学与工程—环境科学]