College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China.
General Surgery Department, Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, PR China.
Chemosphere. 2022 May;294:133736. doi: 10.1016/j.chemosphere.2022.133736. Epub 2022 Jan 24.
Recently, photo-Fenton technology has been widely used to degrade tetracycline (TC) because of its great efficiency and wide application range. Herein, Fe-Ni layered double hydroxides (FeNi-LDH)/TiC photo-Fenton system was constructed in this study. The results showed the introduction of TiC solved some problems of FeNi-LDH such as poor conductivity, easy aggregation, and high recombination rate of photoelectron. Benefiting from these advantages, FeNi-LDH/TiC exhibited excellent TC removal rate of 94.7% while pure FeNi-LDH was only 54%. Besides, FeNi-LDH/TiC possessed strong pH tolerance (2-11) and the removal efficiency was still up to 82% after the four-cycle experiment. Furthermore, the quenching experiments revealed the reaction mechanism, where ∙OH and ·O were the primary active radicals for degrading TC. Last, the results of the simulated wastewater treatment and the inorganic ion interference tests showed that FeNi-LDH/TiC possessed practical application potential. In brief, this study shows that FeNi-LDH/TiC can offer a certain theoretical basis for the actual development of hydrotalcite in heterogeneous photo-Fenton systems.
近年来，由于光芬顿技术具有效率高、应用范围广等优点，已被广泛应用于降解四环素（TC）。本研究构建了 Fe-Ni 层状双氢氧化物（FeNi-LDH）/TiC 光芬顿体系。结果表明，TiC 的引入解决了 FeNi-LDH 导电性差、易团聚、光生电子复合率高等问题。得益于这些优势，FeNi-LDH/TiC 对 TC 的去除率达到了 94.7%，而纯 FeNi-LDH 仅为 54%。此外，FeNi-LDH/TiC 具有较强的 pH 耐受能力（2-11），经过四轮实验后，去除效率仍高达 82%。进一步的猝灭实验揭示了反应机制，其中 ∙OH 和 ·O 是降解 TC 的主要活性自由基。最后，模拟废水处理和无机离子干扰试验的结果表明，FeNi-LDH/TiC 具有实际应用潜力。总之，本研究表明，FeNi-LDH/TiC 可为水滑石在非均相光芬顿体系中的实际发展提供一定的理论依据。
