Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong Engineering Technology Research Center of Efficient Green Energy and Environment Protection Materials, Guangdong Provincial Engineering Technology Research Center for Wastewater Management and Treatment, School of Environment, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China.
College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
J Hazard Mater. 2021 Aug 15;416:125729. doi: 10.1016/j.jhazmat.2021.125729. Epub 2021 Mar 24.
Metal sites (Ni, Bi or Ag) were introduced into carbon strengthened expanded graphite (CEG) based photocatalysts, and performed as a novel strategy to enhance the elimination of Microcystis aeruginosa and microcystin-LR from water. Results show that metal doping can efficiently improve the adsorption of harmful algae and enhance the photocatalytic activities in inactivation of harmful algae and degradation of MC-LR. Among the CEG catalysts, Ni-CEG can achieve the highest removal rate up to 90.6% for algal cells with 5 h visible light irradiation, while Bi-CEG catalyst provides the best performance for MC-LR degradation with the removal rate of 80.9% in 6 h visible light irradiation. In general, considering the coexistence of algal cells and microcystin-LR, Bi-CEG is proved to be an excellent candidate for the remediation of eutrophicated waters since it can achieve the efficient removal of both harmful algae and MC-LR. DFT calculations indicate that metal doping can transform the photocatalysts into n-type semiconductor, and provide the mid-gap state. In addition, the partial charge density distribution near Fermi level was mainly composed by the metal dopants, which can enhance the interaction with harmful algae and MC-LR.
金属（镍、铋或银）位被引入到基于碳强化膨胀石墨（CEG）的光催化剂中，这被证明是一种提高从水中消除铜绿微囊藻和微囊藻毒素-LR 的新策略。结果表明，金属掺杂可以有效地提高对有害藻类的吸附能力，并增强光催化活性，从而实现对有害藻类的灭活和 MC-LR 的降解。在 CEG 催化剂中，Ni-CEG 在可见光照射 5 小时后对藻细胞的去除率最高，达到 90.6%，而 Bi-CEG 催化剂在可见光照射 6 小时后对 MC-LR 的降解性能最好，去除率达到 80.9%。总的来说，考虑到藻细胞和微囊藻毒素-LR 的共存，Bi-CEG 被证明是富营养化水体修复的理想选择，因为它可以有效地去除有害藻类和 MC-LR。DFT 计算表明，金属掺杂可以将光催化剂转化为 n 型半导体，并提供中间带隙态。此外，费米能级附近的部分电荷密度分布主要由金属掺杂剂组成，这可以增强与有害藻类和 MC-LR 的相互作用。
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