期刊
MATERIALS RESEARCH EXPRESS
卷 7, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/ab9e47
关键词
reduced graphene oxide; persulfate; metal-free catalyst; tetracycline; kinetics
资金
- Ministry of Science and Technology of Vietnam [NDT.75. CHN/19]
Reduced graphite oxide (rGO) was synthesized from graphene oxide (GO) by reduction process with the aid of ascorbic acid. GO was synthesized from graphite precursor by modified Hummers method. The prepared materials were characterized in terms of surface morphology, structure, functional group, and elemental compositions by different methods such as SEM/EDS, XRD, FT-IR, Raman, and BET. rGO/K(2)S(2)O(8)system was used to study the impact of different reaction parameters on the degradation of tetracycline in water. The results showed that GO and rGO materials were successfully synthesized, with high purity. The prepared rGO promoted the degradation of tetracycline by sulphate radicals generated from K(2)S(2)O(8)with an efficiency of two-fold higher than sole K2S2O8. More than 95% of 5 mg l(-1)tetracycline were removed by rGO/K(2)S(2)O(8)system after 40 min of reaction. The catalytic performance of rGO/K2S2O system in the degradation of tetracycline was dependent on pH of the solution, catalyst loading, tetracycline initial concentration, and persulfate concentration. The optimal conditions for the degradation of tetracycline in water were at pH(10), with 5 mg l(-1)tetracycline initial concentration, 20 mg l(-1)of rGO, and 0.2 mM persulfate added. The catalytic performance of the system showed relatively stable, with about 75% tetracycline in solution were removed after 3 cycles. The degradation of tetracycline by rGO/K(2)S(2)O(8)system followed the pseudo-first order kinetics, with a typical coefficient of determination above 0.95 for all experimental conditions.
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