Abstract

A bench-scale tubular photo-reactor was built to evaluate the solar-driven TiO₂–based photocatalytic degradation of synthetic polluted water samples. The reactor was designed as a compound-parabolic-collector and operated in batch mode using TiO₂ P25 immobilized on a bed of pumice. The immobilization of TiO₂ on pumice was carried out using a facile dip impregnation method followed by heat treatment. The obtained material was characterized by SEM, EDS, XRD, and nitrogen adsorption. It was possible to impregnate up to 68.5 mg of TiO₂ per gram of pumice stones of 8–14 mm. Conversions of up to 35–40 and 62–69%, after 4 h of treatment and UV doses of 20.8 ± 3.5 kJ L⁻¹, were achieved when the catalyst was used immobilized on pumice stone and in the form of a suspension, respectively. The stability and reusability of the catalyst–coated support was tested through a series of consecutive photocatalytic experiments. After four consecutive runs, the immobilized catalyst showed a decrease in its photoactivity leading to removal levels of 23%.

摘要

建立了一个小型管状光反应器，以评估太阳能驱动的基于 TiO ₂的合成污染水样品的光催化降解。反应器设计为复合抛物线收集器，并使用固定在浮石床上的TiO _{2 P25 以间歇模式运行。}TiO ₂在浮石上的固定是使用一种简单的浸渍法然后热处理来进行的。所获得的材料通过SEM、EDS、XRD和氮气吸附进行了表征。每克 8-14 毫米的浮石可以浸渍高达 68.5 毫克的 TiO _{2 。}^{处理 4 小时和 20.8 ± 3.5 kJ L -1}的紫外线剂量后，转化率高达 35-40 和 62-69%，当催化剂分别以固定在浮石上和以悬浮液的形式使用时，实现了。通过一系列连续的光催化实验测试了催化剂涂层载体的稳定性和可重复使用性。连续四次运行后，固定化催化剂的光活性降低，去除率达到 23%。