Luo Lisha, Zou Donglei, Lu Dongwei, Yu Fengli, Xin Bingjing, Ma Jun
Key Laboratory of Ministry of Education for Groundwater Resources and Environment, College of New Energy and Environment, Jilin University Changchun 130000 P. R. China.
College of Resources and Environmental Engineering, Jilin Institute of Chemical Technology Jilin 132022 China.
RSC Adv. 2018 Dec 7;8(72):41109-41116. doi: 10.1039/c8ra08402e.
Tetracycline hydrochloride (TCH) degradation by cobalt modified silicate ore (CoSO) catalytic ozonation in aqueous solution was investigated. CoSO catalyst was synthesized by an impregnation method using Co(NO) as the precursor and natural silicon ore (SO) as the support. The key catalyst preparation conditions (, impregnation concentration, calcination temperature and time) were optimized. The activity and stability of CoSO catalyst and its catalytic ozonation mechanism for TCH degradation were studied. The results showed that CoO was successfully coated on the silicon ore and the CoSO catalyst was highly efficient in catalytic ozonation for TCH degradation. The TCH removal by CoSO/O could reach 93.2%, while only 69.3% by SO/O and only 46.0% by O alone at 25 min. The reaction of TCH degradation followed pseudo-first order kinetics. TOC removal rate by CoSO/O was 2.0 times higher than that by SO/O, and 3.5 times higher than that by O alone. The reaction conditions (TCH initial concentration, catalyst concentration, pH and temperature) for catalytic ozonation were systematically investigated. The possible mechanism for the CoSO catalytic ozonation process was proposed, where hydroxyl radical oxidation mainly accounted for the substantial TCH degradation. Furthermore, CoSO showed great durability and stability after seven reaction cycles.
研究了水溶液中钴改性硅矿石（CoSO）催化臭氧化降解盐酸四环素（TCH）的过程。以Co(NO)为前驱体、天然硅矿石（SO）为载体，采用浸渍法合成了CoSO催化剂。优化了关键的催化剂制备条件（如浸渍浓度、煅烧温度和时间）。研究了CoSO催化剂的活性和稳定性及其对TCH降解的催化臭氧化机理。结果表明，CoO成功负载在硅矿石上，CoSO催化剂对TCH降解的催化臭氧化效率很高。在25分钟时，CoSO/O对TCH的去除率可达93.2%，而SO/O仅为69.3%，单独O3仅为46.0%。TCH降解反应遵循准一级动力学。CoSO/O对TOC的去除率比SO/O高2.0倍，比单独O3高3.5倍。系统研究了催化臭氧化的反应条件（TCH初始浓度、催化剂浓度、pH值和温度）。提出了CoSO催化臭氧化过程的可能机理，其中羟基自由基氧化是TCH大量降解的主要原因。此外，CoSO在七个反应循环后表现出良好的耐久性和稳定性。
