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Synergistic effect for the degradation of tetracycline by rGO-Co3O4 assisted persulfate activation
Journal of Physics and Chemistry of Solids ( IF 4.3 ) Pub Date : 2021-02-24 , DOI: 10.1016/j.jpcs.2021.110005
Viet Cuong Dang , Dinh Trinh Tran , Anh Tuan Phan , Ngoc Khanh Pham , Van Noi Nguyen

In this work, reduced graphene oxide (rGO), Co3O4, and rGO–Co3O4 composites were successfully synthesized while their catalytic activity was evaluated regarding the degradation of tetracycline (TC) by persulfate (S2O82−) activation process in aqueous solutions. Surface morphologies, composition, and structure of the as produced materials were investigated with the aid of different techniques such as XRD, SEM, EDX, FT-IR, and BET analysis. The catalytic activity of rGO–Co3O4 composite was evaluated regarding TC degradation by K2S2O8 (PS). The results revealed that pure Co3O4, rGO, and rGO–Co3O4 were successfully synthesized. Co3O4 sample presented spinel structure, with an average diameter of 26.7 nm while C/O ratio in rGO sample was about 3.2. rGO–Co3O4 composite significantly enhanced the removal of TC with a typical efficiency of over twofold compared to sole Co3O4.

About 96% of TC (5 mg/L) were decomposed by rGO–Co3O4/PS catalytic system after 60 min at room temperature. The catalytic performance of rGO–Co3O4/PS system was affected by pH of solutions, TC initial concentration, catalyst dosage, and PS concentration. The rGO–Co3O4/PS system degraded the most TC in aqueous solutions at the following condition: rGO = 200 mg/L, pH6, TC = 5 mg/L, and PS = 0.3 mM; it was shown to be a perspective recyclable potential with a TC removal efficiency of more than 84% after three reuse cycles.

TC degradation process fitted the pseudo-first order kinetics the most (r2 = 0.98 for optimal condition), corresponding to a 0.023 min−1 rate constant. Both HO and SO4•- radicals generated from the rGO–Co3O4/PS system were primarily species that degraded TC in solutions.



中文翻译:

rGO-Co 3 O 4辅助过硫酸盐活化对四环素降解的协同作用

在这项工作中,成功地合成了还原氧化石墨烯(rGO),Co 3 O 4和rGO–Co 3 O 4复合材料,同时评估了它们对过硫酸盐(S 2 O 8 2-)降解四环素(TC)的催化活性。)在水溶液中的活化过程。借助不同的技术(例如XRD,SEM,EDX,FT-IR和BET分析)研究了所生产材料的表面形态,组成和结构。评估了K 2 S 2 O 8对TC降解rGO–Co 3 O 4复合材料的催化活性。(PS)。结果表明,成功地合成了纯Co 3 O 4,rGO和rGO–Co 3 O 4。Co 3 O 4样品呈现尖晶石结构,平均直径为26.7 nm,而rGO样品中的C / O比约为3.2。与单独的Co 3 O 4相比,rGO–Co 3 O 4复合材料显着提高了TC的去除效率,典型效率是其两倍。

室温下60分钟后,rGO–Co 3 O 4 / PS催化系统分解了约96%的TC(5 mg / L)。rGO–Co 3 O 4 / PS系统的催化性能受溶液的pH值,TC初始浓度,催化剂用量和PS浓度的影响。在以下条件下,rGO–Co 3 O 4 / PS系统降解水溶液中的TC最多:rGO = 200 mg / L,pH 6,TC = 5 mg / L,PS = 0.3 mM;在三个重复使用周期后,它显示出可回收利用的远景潜力,TC去除效率超过84%。

TC降解过程最适合拟一级动力学( 对于最佳条件,r 2 = 0.98),对应于0.023 min -1的速率常数。rGO–Co 3 O 4 / PS系统产生的HO 和SO 4 自由基都是降解溶液中TC的物质。

更新日期:2021-03-01
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