Yang Guoxiang, Wang Longyang, Gao Mengyang, Liu Aoxiang, Shen Bo, Xiang Zhuomin, Zheng Qi, Zhou Lei, Ding Yang, Hao Derek, Wang Qi, Tang Xiujuan
Zhejiang Key Laboratory of Solid Waste Pollution Control and Resource Utilization, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China.
State Key Laboratory for Managing Biotic and Chemical Treats to the Quality and Safety of Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China.
J Environ Manage. 2025 Sep;392:126880. doi: 10.1016/j.jenvman.2025.126880. Epub 2025 Aug 6.
Non-precious metals that demonstrate surface plasmon resonance (SPR) effects have attracted considerable attention due to their ability to enhance the photocatalytic degradation of unexpected pollutants in water. Here, the interfacial charge transfer and improvement of the Bi-metal center are accomplished through in-situ synthesis, along with a comprehensive analysis of the catalytic activity and mechanism of the Bi-metal center. On this basis, the response surface method (RSM) and statistical analysis are used to evaluate the performance of Cr(VI). The adequacy results of the models showed that all models could predict the photoreduction efficiency of Cr(VI) by Bi@NM-88. The results of process optimization showed that pH = 5, Cr(VI) concentration = 80 μmol L, photocatalyst dosage (100 mg L), and ammonium oxalate concentration (0.21 mmol L) are the optimal levels of the study parameters. Additionally, the Bi@NM-88 is capable of efficiently eliminating Cr(VI) from wastewater generated by industrial electroplating. The removal rate of Cr(VI) surpasses 80 % after 240 min of exposure to light, indicating its promising potential for real-world wastewater treatment applications. In addition, the toxic effects of the solution after photocatalytic reduction of Cr(VI) on plant growth are further studied through experiments on photosystem II (PSII) of wheat seedlings and ecotoxicity experiments on the roots and stems of rice seedlings. Moreover, the Fukui index and quantitative structure-activity relationship (QSAR) are used to determine the reaction sites and toxicity of reaction intermediates of TC-HCl molecules. It should be emphasized that the junction of Bi with the amino functional group of Bi@NM-88 is the most significant place for charge transfer under UV-Vis light, indicating that this is the center of its catalytic activity. This study inspires the design of high-performance core-shell structured photocatalysts and expands their practical applications in environmental remediation.
具有表面等离子体共振（SPR）效应的非贵金属因其能够增强水中意外污染物的光催化降解能力而备受关注。在此，通过原位合成实现了界面电荷转移和双金属中心的改进，并对双金属中心的催化活性和机理进行了全面分析。在此基础上，采用响应面法（RSM）和统计分析来评估Cr（VI）的性能。模型的充分性结果表明，所有模型都可以预测Bi@NM - 88对Cr（VI）的光还原效率。工艺优化结果表明，pH = 5、Cr（VI）浓度 = 80 μmol L、光催化剂用量（100 mg L）和草酸铵浓度（0.21 mmol L）是研究参数的最佳水平。此外，Bi@NM - 88能够有效去除工业电镀产生的废水中的Cr（VI）。光照240分钟后，Cr（VI）的去除率超过80%，表明其在实际废水处理应用中具有广阔的潜力。此外，通过对小麦幼苗光系统II（PSII）的实验以及对水稻幼苗根和茎的生态毒性实验，进一步研究了Cr（VI）光催化还原后溶液对植物生长的毒性作用。此外，利用福井指数和定量构效关系（QSAR）来确定TC - HCl分子反应中间体的反应位点和毒性。需要强调的是，Bi与Bi@NM - 88氨基官能团的结合处是紫外 - 可见光下电荷转移最显著的位置，表示这是其催化活性中心。本研究为高性能核壳结构光催化剂的设计提供了思路，并拓展了其在环境修复中的实际应用。
