Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore.
Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore; Instituto de Energías Renovables, Universidad Nacional Autónoma de México (IER-UNAM), Priv. Xochicalco S/N, Col. Centro, Temixco, Morelos, 62580, Mexico.
Chemosphere. 2021 Aug;276:130138. doi: 10.1016/j.chemosphere.2021.130138. Epub 2021 Mar 1.
Three different visible-light photocatalysts (hematite (α-FeO), bismuth vanadate (BiVO) and Mo-doped bismuth vanadate (BiMoVO)) deposited on transparent fluorine-doped SnO (FTO) were evaluated for the solar-driven photoelectrocatalytic treatment of emerging pollutants. BiMoVO was found to be the most effective photoanode, yielding the fastest degradation rate constant and highest mineralization efficiency using phenol as the oxidation probe. The BiMoVO photoanode was then used to degrade the herbicide simazine in a photoelectrolytic cell combining photoelectrocatalysis (PEC) with photoelectron-Fenton (PEF) under solar light (SPEC-SPEC). Total simazine removal was achieved within 1 min of treatment (k = 4.21 min) at the optimum electrode potential of 2.5 V vs Ag/AgCl, with complete TOC removal in 2 h. The analysis of anionic species in solution during treatment showed that most of the nitrogen heteroatoms in the simazine structure were converted into NO following OH addition to organic N. This innovative process combining BiMoVO-PEC with PEF using solar light as a sustainable source of energy (SPEC-SPEF) achieved the highest degradation/mineralization efficiency ever reported for simazine treatment. Besides, this is the first work reporting the photo(electrochemical) degradation of this toxic herbicide.
三种不同的可见光光催化剂（赤铁矿（α-FeO）、钒酸铋（BiVO）和 Mo 掺杂钒酸铋（BiMoVO））沉积在透明掺氟氧化锡（FTO）上，用于评估新兴污染物的太阳能驱动光电催化处理。发现 BiMoVO 是最有效的光阳极，以苯酚作为氧化探针，表现出最快的降解速率常数和最高的矿化效率。然后，在太阳能（SPEC-SPEC）下，将 BiMoVO 光电阳极用于结合光电催化（PEC）和光电芬顿（PEF）的光电解池降解除草剂西玛津。在最佳电极电位 2.5 V vs Ag/AgCl 下，处理 1 分钟内即可实现西玛津的完全去除（k = 4.21 min），2 小时内即可完全去除 TOC。在处理过程中对溶液中阴离子物种的分析表明，西玛津结构中的大多数氮杂原子在与有机 N 的 OH 加成后转化为 NO。这种结合 BiMoVO-PEC 和使用太阳能作为可持续能源的 PEF 的创新工艺（SPEC-SPEF）实现了西玛津处理的最高降解/矿化效率。此外，这是首次报道该有毒除草剂的光（电化学）降解。
