Environmental Science & Engineering Research Center, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China; School of Environment, Tsinghua University, Beijing 100084, China.
Key Laboratory of Groundwater Resources & Environment, Ministry of Education, Jilin University, Changchun 130021, Jilin, China.
J Colloid Interface Sci. 2018 Oct 1;527:78-86. doi: 10.1016/j.jcis.2018.05.038. Epub 2018 May 15.
Non-metallic graphene oxide (GO) and carbon nanodots (CDots) co-doped BiOBr ternary system (GO/CDots/BiOBr) were successfully synthesized via a simple one-step solvothermal process. The compositional characterization, optical and electrical properties of photocatalysts were investigated in detail. The prepared ternary photocatalysts possessed the excellent visible-light driven photocatalytic 4-chlorophenol (4-CP) degradation. Additionally, the 4-CP removal efficiencies decreased in the order of GO/CDots/BiOBr (88.9%) > CDots/BiOBr (62.9%) > GO/BiOBr (60.5%) > pristine BiOBr (46.9%) in 6 h under visible light irradiation. The dissolved organic carbon (DOC) removal and the dechlorination efficiency by the GO/CDots/BiOBr were 58.4% and 78.2%, respectively, much higher than pristine BiOBr. The co-existence of GO and CDots on the BiOBr greatly promoted visible light harvesting and utilizing ability and inhibited the recombination of photogenerated electron/hole pairs. The synergistic effect between GO, CDots and BiOBr was expounded, and the photocatalytic reaction mechanism was proposed in detail via the band structure analysis and free radical trapping experiments.
通过简单的一步溶剂热法成功合成了非金属氧化石墨烯（GO）和碳点（CDots）共掺杂 BiOBr 三元体系（GO/CDots/BiOBr）。详细研究了催化剂的组成特性、光学和电学性质。所制备的三元光催化剂具有优异的可见光驱动 4-氯苯酚（4-CP）降解性能。此外，在可见光照射下 6 h 内，4-CP 的去除效率按以下顺序降低：GO/CDots/BiOBr（88.9%）>CDots/BiOBr（62.9%）>GO/BiOBr（60.5%）>原始 BiOBr（46.9%）。GO/CDots/BiOBr 的溶解有机碳（DOC）去除率和脱氯效率分别为 58.4%和 78.2%，明显高于原始 BiOBr。GO 和 CDots 在 BiOBr 上的共存极大地促进了可见光的捕获和利用能力，并抑制了光生电子/空穴对的复合。通过能带结构分析和自由基捕获实验详细阐述了 GO、CDots 和 BiOBr 之间的协同效应，并提出了详细的光催化反应机制。
