State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing, 210023, PR China.
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing, 210023, PR China.
Chemosphere. 2020 Oct;257:127256. doi: 10.1016/j.chemosphere.2020.127256. Epub 2020 Jun 3.
Five kinds of AlO were characterized by SEM, TEM, FT-IR and BET surface area, and then used as carriers to investigate the photochemical removal of hexachlorobenzene (HCB) in aqueous system. The results showed that HCB coated on the surfaces of all AlO could be photodegraded rapidly, and Neutral-AlO presented the best performance. Meanwhile, the efficient removal of HCB in real water matrices, including tap water, river water and secondary clarifier effluent showed the potential practical application of AlO. EPR and theoretical calculation revealed the generation of hydroxyl radicals on AlO surface under 500 W Xe lamp irradiation. Nine intermediates and a small amount of Cl were identified by GC/MS, LC/MS and IC analysis, which was further verified by transition state calculations. These results can provide a new technique for HCB removal in water and wastewaters, and give more insights into the environmental ecological risk assessment of this pollutant.
五种 AlO 通过 SEM、TEM、FT-IR 和 BET 表面积进行了表征，然后用作载体来研究在水体系中光化学去除六氯苯（HCB）。结果表明，所有 AlO 表面上的 HCB 都能迅速被光降解，而中性 AlO 表现出最好的性能。同时，在实际水基质（包括自来水、河水和二级澄清器出水）中高效去除 HCB，显示了 AlO 的潜在实际应用。EPR 和理论计算表明，在 500 W Xe 灯照射下，AlO 表面上生成了羟基自由基。通过 GC/MS、LC/MS 和 IC 分析鉴定了 9 种中间产物和少量的 Cl，通过过渡态计算进一步验证了这一点。这些结果可为水中和废水中的 HCB 去除提供一种新技术，并为评估这种污染物的环境生态风险提供更多的见解。
