College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China.
College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China; Key Laboratory of Treatment for Special Wastewater of Sichuan Province Higher Education System, Chengdu 610066, China.
Chemosphere. 2018 Oct;208:665-673. doi: 10.1016/j.chemosphere.2018.06.016. Epub 2018 Jun 4.
A novel Zn-CNTs-FeO composite was synthesized by the chemical co-precipitation combined with high sintering process at nitrogen atmosphere. The as-prepared composite was characterized by SEM, EDS, XRD, XPS, VSM and N adsorption/desorption experiments. A novel heterogeneous Fenton-like system, composed of Zn-CNTs-FeO composite and dissolved oxygen (O) in solution, which can in situ generate HO and OH, was used for the degradation of 4-chlorophenol (4-CP). The influences of various operational parameters, including the initial pH, dosage of Zn-CNTs-FeO and initial concentration of 4-CP on the removal of 4-CP were investigated. The removal efficiencies of 4-CP and total organic carbon (TOC) were 99% and 57%, respectively, at the initial pH of 1.5, Zn-CNTs-FeO dosage of 2 g/L, 4-CP initial concentration of 50 mg/L and oxygen flow rate of 400 mL/min. Based on the results of the radical scavenger effect study, the hydroxyl radical was considered as the main reactive oxidants in Zn-CNTs-FeO/O system and a possible degradation pathway of 4-CP was proposed.
采用化学共沉淀法结合氮气高温烧结工艺合成了一种新型的 Zn-CNTs-FeO 复合材料。通过 SEM、EDS、XRD、XPS、VSM 和 N 吸附/解吸实验对所制备的复合材料进行了表征。构建了一种新型的非均相类 Fenton 体系，由 Zn-CNTs-FeO 复合材料和溶液中的溶解氧（O）组成，可原位生成 HO 和 OH，用于降解 4-氯苯酚（4-CP）。考察了初始 pH 值、Zn-CNTs-FeO 用量和 4-CP 初始浓度等各种操作参数对 4-CP 去除的影响。在初始 pH 值为 1.5、Zn-CNTs-FeO 用量为 2 g/L、4-CP 初始浓度为 50 mg/L、氧气流速为 400 mL/min 的条件下，4-CP 的去除率和总有机碳（TOC）去除率分别达到 99%和 57%。根据自由基清除剂效应研究的结果，羟基自由基被认为是 Zn-CNTs-FeO/O 体系中的主要反应性氧化剂，并提出了 4-CP 的可能降解途径。
