Enhanced photocatalytic performance and a mechanistic study of novel black phosphorus/graphene/TiO2 composite membrane for o-chlorophenol removal

IF 7.7 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Guanlan Wu , Chengzhi Wang , Ying Ma , Huizi Zheng , Linzhe Huang , Xiaolin Zhu , How Yong Ng
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引用次数: 0

Abstract

The heterogeneous catalysis of the composite membrane not only exerts the synergistic effect of different materials but also enable the recyclable use of catalysts, making it an ideal and sustainable strategy for removing pollutants in water. In this study, a novel black phosphorus/graphene/titanium dioxide (BP/GR/TiO2) membrane was successfully prepared through the sol-gel method. The composite membrane not only overcame the instability of black phosphorus and the rapid recombination of e-/h+ pairs in titanium dioxide but also synergized with GR to produce a new reactive oxygen species (ROS), singlet oxygen (1O2), with a longer lifetime and migration distance. This ROS was a highly selective reactive species responsible for the efficient degradation and, consequently, the removal of o-chlorophenol (o-CP). Specifically, BP simultaneously enhanced the specific surface area and visible light absorption of BP/GR/TiO2, resulting an o-CP degradation efficiency of up to 98.1% after 5 h of simulated solar irradiation with 0.3% BP doping. The photocatalytic mineralization efficiency of o-CP after 10 h of light was 60.1%, which was 1.41 times higher than that of the corresponding BP/TiO2 membrane. Following recycling, the degradation efficiency and rate of BP/GR/TiO2 were 1.71 and 1.79 times higher than those of BP/TiO2, respectively, demonstrating excellent stability and recyclability.

Abstract Image

新型黑磷/石墨烯/TiO2复合膜去除邻氯酚的光催化性能及机理研究。
复合膜的多相催化作用不仅发挥了不同材料的协同作用,而且使催化剂可循环利用,是去除水中污染物的一种理想的可持续策略。本研究通过溶胶-凝胶法制备了新型黑磷/石墨烯/二氧化钛(BP/GR/TiO2)膜。复合膜不仅克服了黑磷的不稳定性和e-/h+对在二氧化钛中的快速重组,而且与GR协同产生了一种新的活性氧(ROS),单线态氧(1O2),具有更长的寿命和更长的迁移距离。这种活性氧是一种高度选择性的活性物质,负责有效降解,从而去除邻氯酚(o-CP)。具体来说,BP同时增强了BP/GR/TiO2的比表面积和可见光吸收,在0.3% BP掺杂的模拟太阳照射5小时后,o-CP降解效率高达98.1%。光催化10小时后o-CP的光催化矿化效率为60.1%,比相应的BP/TiO2膜的矿化效率高1.41倍。回收后,BP/GR/TiO2的降解效率和降解速率分别是BP/TiO2的1.71倍和1.79倍,具有良好的稳定性和可回收性。
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来源期刊
Environmental Research
Environmental Research 环境科学-公共卫生、环境卫生与职业卫生
CiteScore
12.60
自引率
8.40%
发文量
2480
审稿时长
4.7 months
期刊介绍: The Environmental Research journal presents a broad range of interdisciplinary research, focused on addressing worldwide environmental concerns and featuring innovative findings. Our publication strives to explore relevant anthropogenic issues across various environmental sectors, showcasing practical applications in real-life settings.
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