Department of Agricultural Chemistry, Geology and Pedology, Faculty of Chemistry, University of Murcia, Campus Universitario de Espinardo, 30100, Murcia, Spain.
Applied Technology Group to Environmental Health. Faculty of Health Science, Catholic University of Murcia, Campus de Los Jerónimos, s/n. Guadalupe, 30107, Murcia, Spain.
J Environ Manage. 2022 Nov 1;321:115936. doi: 10.1016/j.jenvman.2022.115936. Epub 2022 Aug 15.
Solar heterogeneous photocatalysis was used to remove trihalomethanes (THMs) from drinking water. THMs, mainly trichloromethane (TCM), tribromomethane (TBM), bromodichloromethane (BDCM) and dibromochloromethane (DBCM) are one of the main class of disinfection by-products (DBPs). THMs were determined by HSGC-MS with detection limits (LODs) ranging from 0.5 μg L to 0.9 μg L for TCM and BDCM, respectively. Results show that a great proportion of THMs present in water are finally transferred to air as a result of their high volatility in the order TCM > BDCM > DBCM > TBM. The use of band-gap semiconductor materials (TiO and mainly ZnO) used as photocatalysts in combination with NaSO as electron acceptor and sulfate radical anion (SO) generator enhanced the photooxidation of all THMs as compared to photolytic test. The time required for 50% of THMs to disappear (DT) from water calculated for the most effective treatment (ZnO/NaSO) were 12, 42, 57 and 61 min for TCM, TBM, BDCM, and DBCM, respectively. Therefore, solar heterogeneous photocatalysis can be considered as an interesting strategy for THMs removal, especially in sunny areas like Mediterranean basin.
利用太阳能异质光催化技术去除饮用水中的三卤甲烷（THMs）。THMs 主要包括三氯甲烷（TCM）、三溴甲烷（TBM）、一溴二氯甲烷（BDCM）和二溴一氯甲烷（DBCM），是消毒副产物（DBPs）的主要类别之一。THMs 采用 HSGC-MS 进行测定，TCM 和 BDCM 的检测限（LOD）分别为 0.5μg/L 和 0.9μg/L。结果表明，由于其高挥发性，水中存在的很大一部分 THMs 最终会转移到空气中，其挥发性顺序为 TCM>TBM>BDCM>DBCM。与光解试验相比，使用带隙半导体材料（TiO 和主要的 ZnO）作为光催化剂，结合 NaSO 作为电子受体和硫酸盐自由基阴离子（SO）生成剂，增强了所有 THMs 的光氧化作用。对于最有效的处理方法（ZnO/NaSO），计算出水中 50%的 THMs 消失所需的时间（DT）分别为 TCM、TBM、BDCM 和 DBCM 的 12、42、57 和 61 分钟。因此，太阳能异质光催化技术可以被视为去除 THMs 的一种有趣策略，特别是在像地中海盆地这样阳光充足的地区。
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