从红土镍矿中合成的 Cu 掺杂 (Mg,Ni)(Fe,Al)O 增强的类芬顿多相降解难处理有机污染物。
Enhanced heterogeneous Fenton-like degradation of refractory organic contaminants over Cu doped (Mg,Ni)(Fe,Al)O synthesized from laterite nickel ore.
机构信息
State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 10083, PR China.
State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 10083, PR China; MCC CISDI Electric Technology Co., Ltd, Beijing, 100176, PR China.
出版信息
J Environ Manage. 2021 Apr 1;283:111941. doi: 10.1016/j.jenvman.2021.111941. Epub 2021 Jan 24.
The heterogeneous Fenton-like catalyst (Mg,Cu,Ni)(Fe,Al)O was synthesized via a coprecipitation method using laterite nickel ore leaching solution as raw material. The effects of CuCl·2HO addition and calcination temperature on the microstructures and degradation properties of the obtained products were investigated. Results showed that higher calcination temperature could promote the migration of Cu ions from CuO to the spinel ferrite lattice and occupied octahedral sites. The degradation efficiencies (η) of various types of low-concentration dyes and tetracycline were higher than 95%, which was mainly due to the accelerated generation of OH radicals by the synergistic effect of Fe and Cu ions in octahedral sites of the formed (Mg,Cu,Ni)(Fe,Al)O. Moreover, after five consecutive degradation cycles, the η of RhB was still close to 100%, TOC removal efficiency was maintained around 40% and the concentrations of metallic ions in degraded solutions were all lower than the national effluent discharge standard (GB8978-1996), confirming the as-obtained (Mg,Cu,Ni)(Fe,Al)O was an eco-friendly heterogeneous Fenton-like catalyst with excellent stability and reusability. This study may provide an effective reference for large scale preparing efficient heterogeneous Fenton-like catalysts from natural minerals in treating the wastewater contaminated by refractory organics.
采用共沉淀法，以红土镍矿浸出液为原料，合成了非均相类 Fenton 催化剂（Mg、Cu、Ni）（Fe、Al）O。考察了 CuCl·2HO 添加量和煅烧温度对所得产物微观结构和降解性能的影响。结果表明，较高的煅烧温度有利于 Cu 离子从 CuO 向尖晶石铁氧体晶格迁移，并占据八面体位置。各种低浓度染料和四环素的降解效率（η）均高于 95%，这主要是由于形成的（Mg、Cu、Ni）（Fe、Al）O 中 Fe 和 Cu 离子在八面体位置的协同作用加速了 OH 自由基的生成。此外，在连续五次降解循环后，RhB 的 η 仍接近 100%，TOC 去除效率保持在 40%左右，降解溶液中金属离子的浓度均低于国家污水排放标准（GB8978-1996），证明所制备的（Mg、Cu、Ni）（Fe、Al）O 是一种环境友好的非均相类 Fenton 催化剂，具有优异的稳定性和可重复使用性。本研究可为利用天然矿物大规模制备高效非均相类 Fenton 催化剂处理难降解有机废水提供有效参考。
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