摘要
在一个循环式光反应系统中进行了苯的气相光催化实验.考察了催化剂与反应物的接触面积,催化剂用量和苯的初始浓度对苯光催化氧化反应的影响.结果表明,催化剂与反应物的接触面积和光强度的共同作用是影响苯光催化降解速度的主要因素.实验条件下,催化剂接触面积增加2倍,反应时间缩短260min.再将光强度提高1倍,反应时间缩短320min;催化剂用量对反应过程的影响主要是催化剂层吸附能力的影响,随着催化剂用量的增加这种影响逐渐减弱.当催化剂用量从0.1g增加到0.5g时,反应时间缩短100min,而从0.5g增加到1.5g时只缩短20min;当系统中苯的浓度较低时,随着初始浓度的增加反应中苯的浓度变化增大,但在高浓度系统中初始浓度的影响不明显.
Gas-phase photocatalytic reaction test of benzene was performed in a recirculation photocatalytic system. The influences of contact area of catalyst with reactant catalyst area, catalyst dosage and initial concentration of benzene on the benzene photocatalytic oxidation reaction were investigated. The joint action of catalyst contact area with reactant and light intensity was the main factors influencing the speed of benzene photocatalytic degradation. Under the experimental conditions, 260min of the reaction time was reduced with catalyst area increase of 2 times, if light intensity was in creased 1 time, 320min of the time was reduced. The influence of catalyst dosage on the reaction process was mainly the influence of adsorption capability of catalyst layer; and it was weakened gradually with the increase of the dosage of catalyst. The reaction time dropped by 100min when the dosage was increased from 0.1g to 0.5g; but from 0.5g to 1.5g, the time only dropped by 20min. The change of benzene concentration increased in the reaction with the increase of the initial concentration when the system was lower on the concentration of benzene, but the influence of the initial concentration was not obvious in the system of higher concentration.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2003年第6期661-664,共4页
China Environmental Science
基金
国家"十五"医学科技攻关项目(2001BA704B02)
关键词
气相光催化氧化
光催化剂
光反应器
室内空气
苯
gas-phase photocatalytic oxidation
photocatalyst
photoreactor
indoor air
benzene
