PMS activation using reduced graphene oxide under sonication: Efficient metal-free catalytic system for the degradation of rhodamine B, bisphenol A, and tetracycline

被引:103
作者
Cherifi, Yacine [1 ,2 ]
Addad, Ahmed [3 ]
Vezin, Herve [4 ]
Barras, Alexandre [1 ]
Ouddane, Baghdad [4 ]
Chaouchi, Ahcene [2 ]
Szunerits, Sabine [1 ]
Boukherroub, Rabah [1 ]
机构
[1] Univ Valenciennes, Univ Lille, Cent Lille, CNRS,ISEN,UMR 8520,IEMN, F-59000 Lille, France
[2] Univ Mouloud Mammeri Tizi Ouzou, Lab Chim Appl & Genie Chim, Tizi Ouzou, Algeria
[3] Univ Lille, CNRS, UMR 8207, UMET, F-59000 Lille, France
[4] Univ Lille, UMR CNRS 8516, LASIR Lab Spectrochim Infrarouge & Raman, F-59655 Villeneuve Dascq, France
关键词
Reduced graphene oxide; PMS; Ultrasonication; Rhodamine B; Bisphenol A; Tetracycline; Degradation mechanism; HETEROGENEOUS ACTIVATION; PHOTOCATALYTIC DEGRADATION; PERSULFATE OXIDATION; ORGANIC POLLUTANTS; ORANGE II; KINETICS; PEROXYMONOSULFATE; TOXICITY; SONOCHEMISTRY; IONIZATION;
D O I
10.1016/j.ultsonch.2018.11.012
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
This study addresses the influence of ultrasound irradiation on the activation of peroxymonosulfate (PMS) using reduced graphene oxide (rGO) under metal-free conditions for the catalytic degradation of rhodamine B (RhB), bisphenol A (BPA) and tetracycline (TC). Our results revealed that the combination of PMS/rGO and ultra-sonication enhanced significantly the degradation rate, reaching full degradation in relatively short times with total organic carbon (TOC) removal exceeding 85% of the investigated pollutants. In contrast, under these experimental conditions, rGO/ultrasound and PMS/ultrasound achieved less than 20% degradation of the same pollutants. Electron paramagnetic resonance (EPR) studies along with quenching experiments suggested that hydroxyl radicals ((OH)-O-center dot) are the dominant reactive species in the degradation process. Furthermore, inductively coupled plasma atomic emission spectroscopy (ICP-AES) and EPR data revealed the presence of trace manganese (Mn) in rGO. To elucidate the role of Mn on the degradation process, rGO was subjected to hot acid treatment for 48 h to remove trace Mn. While the chemical composition of rGO was not significantly altered by this chemical treatment, the degradation efficiency decreased upon Mn dissolution. The result suggests that trace metal in rGO might account for the efficiency of PMS activation. Finally, plausible degradation pathways were proposed based on LC-MS analysis of the reaction intermediates.
引用
收藏
页码:164 / 175
页数:12
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