Photocatalytic Degradation of Diethyl Phthalate with Surfactant Addition

This paper studies the adsorption of diethyl phthalate (DEP,an environmental hormone) on the surface of nanoscale TiO_2, effects of pH value of solutions, initial concentrations of DEP and additive surfactant on photocatalytic degradation and dynamics of DEP. Under ultra violet illumination, the interaction between DEP and surfactants including DBS (sodium dodecylbenzenesulfon-ate), CTAB (cetyltrimethylammonium bromide), and OP-10 (nonylphenol polyoxyethylene ether) was exploited from the perspective of degradation speed calculated by the data of high pressure liquid chromatography (HPLC) and UV-Vis spectra, respectively. Photocatalytic degradation of DEP followed pseudo first-order reaction kinetics. DEP as substrate degraded fast when its initial concentration was 130 mg/L. TiO_2 had certain adsorption ability of DEP. TiO_2 could adsorb the most DEP at the approximately neutral pH of 6.91. Degradation of DEP was not affected obviously by additives OP-10 and DBS. Degradation rate of DEP was not enhanced greatly in the presence of surfactants, but degradation of DBS was sped up. Degradation rate of DEP was depressed in the presence of additive CTAB. The more CTAB was added, the less DEP was degraded. Degradation rate of CTAB became slow with the increase of initial CTAB concentration. The possible adsorption models among TiO_2, DEP and surfactants were given.     

AHP在高校咨询业影响因素研究中的应用

利用层次分析法对影响因素进行排序,计算结果表明:市场需求、政策支持、行业规范与管理三项是影响我国高校咨询业健康发展的主要因素,应在今后的发展研究中给予关注。     

高中物理解题的几种常用的解题技巧探讨

高中物理是一门逻辑性非常强的学科,学生只有具备清晰的解题思路,才能掌握更多的解题技巧。本文针对当前高中物理知识的特征进行了分析,并探讨了几种解题技巧以供学生参考,旨在帮助更多的学生了解高中物理的解题关键要素,提高学生的物理学习效率和学习成绩,同时为高中物理教师提出更多的教学建议。