【摘要】 用粉末溶胶法,以γ-Al2O3为中间载体在不锈钢薄板上制备掺杂银的新型负载型TiO2光催化剂,对水中的氯苯进行光催化降解。研究表明:在实验的浓度范围内,反应服从一级反应动力学规律,为表观一级反应,反应速率常数k1与初始浓度C0的关系为:lnk1=-0.30lnC0-2.29;二氧化钛中适当掺杂银,可以提高其催化活性;溶液在碱性条件下,有利于反应的进行;随着光辐射强度的增加,反应速率常数呈增大的趋势;氯苯可脱去氯代基,转化为无毒害的无机氯离子。更多还原

【Abstract】 Photocatalytic degradation （PCD） of chlorobenzene was performed using immobilized Ag supplemented TiO₂ catalyst. The procedure for preparing the innovative catalyst is documented. Within the inital concentration of 34¹57 mg/L, the experimental results were best described by the apparent first order reaction, and the effect of initial concentration on the rate constant was: ln k₁=-0.30 ln C₀-2.29. The catalyst prepared from the mixturte with an n（Ag）∶n（TiO₂）of 1∶8 had the best enhancement effect, 24.2% increase in the first order rate constant. The PCD rate constant also increased with increasing feed pH and/or radiation intensity. That dechlorination was accomplished by PCD of chlorobenzene was demonstrated by the quantitative increases in the chloride ions as predicted.更多还原