摘要
研究了十二烷基苯磺酸钠(DBS)的光催化降解效率.结果表明,在实验浓度范围内,DBS的光催化降解能用准一级反应式进行拟合,且DBS的一级反应速率常数随其初始浓度的增大而降低.当体系中存在磷酸二氢钠时,DBS的光催化降解速率降低;当体系中存在三聚磷酸钠时,在其低浓度时DBS的降解速率降低,在高浓度时降解速率则增加.磷酸盐与DBS在TiO2表面会产生竞争吸附,同时也会影响体系的pH值,从而影响到DBS的光催化降解速率.
The photocatalytic degradation of sodium dodecylbenzenesulfonate(DBS) over illuminated titanium dioxide was studied. Results show that the degradation of DBS can be fitted with first-order kinetics. The first-order dioxide rate constant of DBS decreased with the increase of initial DBS concentration. When there exists NaH2PO4 in the system the DBS photocatalytic degradation rate decreases. When there exists Na3P5O10 at low concentration the degradation rate decreases; while at its high concentration the degradation rate increases. The influence of phosphates on DBS degradation rate caused by the competitive adsorption of phosphates and DBS on the surface of TiO2, and the effect of phosphate on pH value in the system at the same time.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2002年第3期263-267,共5页
China Environmental Science
基金
国家自然科学基金资助项目(49571062)
