Tianjin Engineering Research Center of Biomass Solid Waste Resources Technology, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; National & Local Joint Engineering Research Center of Biomass Resource Utilization, Tianjin 300350, China.
Tianjin Engineering Research Center of Biomass Solid Waste Resources Technology, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; National & Local Joint Engineering Research Center of Biomass Resource Utilization, Tianjin 300350, China.
J Hazard Mater. 2020 Jun 5;391:122246. doi: 10.1016/j.jhazmat.2020.122246. Epub 2020 Feb 5.
The mineralization of organic pollutants under visible light is challenging, limiting the practical application of photocatalytic technology in wastewater treatment. To achieve the efficient mineralization of Acid red 3R (AR3R), a series of honeycombed catalysts (TiO, C-TiO, Au@TiO and Au@C-TiO) were prepared via a facile in situ synthetic method and characterized by XRD, TEM, BET, XPS and DRS, respectively. The introduction of C and Au species promote the simultaneous generation of •O and •OH over Au@C-TiO under visible light radiation. The Au@C-TiO catalyst showed superior performance for the deep mineralization of AR3R, affording a TOC removal rate larger than 90 % within 240 min under visible light (> 420 nm). The photocatalytic degradation mechanism of AR3R is proposed according to UV-vis and in situ DRIFTS analysis. The superior photocatalytic activity of Au@C-TiO is attributed to the synergistic effect of •O and •OH owing to C doping and Au deposition.
可见光下有机污染物的矿化具有挑战性，限制了光催化技术在废水处理中的实际应用。为了实现酸性红 3R（AR3R）的高效矿化，通过简便的原位合成方法制备了一系列蜂窝状催化剂（TiO、C-TiO、Au@TiO 和 Au@C-TiO），并分别通过 XRD、TEM、BET、XPS 和 DRS 进行了表征。C 和 Au 物种的引入促进了 Au@C-TiO 在可见光辐射下同时产生•O 和•OH。Au@C-TiO 催化剂对 AR3R 的深度矿化表现出优异的性能，在可见光（>420nm）下 240min 内 TOC 的去除率大于 90%。根据 UV-vis 和原位 DRIFTS 分析提出了 AR3R 的光催化降解机理。Au@C-TiO 的优越光催化活性归因于 C 掺杂和 Au 沉积引起的•O 和•OH 的协同作用。
