Degradation of Bisphenol A by Peroxymonosulfate Catalytically Activated with Mn_1.8Fe_1.2O₄ Nanospheres: Synergism between Mn and Fe

Abstract

A high-efficient, low-cost, and eco-friendly catalyst is highly desired to activate peroxides for environmental remediation. Due to the potential synergistic effect between bimetallic oxides' two different metal cations, these oxides exhibit superior performance in the catalytic activation of peroxymonosulfate (PMS). In this work, novel MnFeO nanospheres were synthesized and used to activate PMS for the degradation of bisphenol A (BPA), a typical refractory pollutant. The catalytic performance of the MnFeO nanospheres was substantially greater than that of the Mn/Fe monometallic oxides and remained efficient in a wide pH range from 4 to 10. More importantly, a synergistic effect between solid-state Mn and Fe was identified in control experiments with MnO and FeO. Mn was inferred to be the primary active site in the surface of the MnFeO nanospheres, while Fe(III) was found to play a key role in the synergism with Mn by acting as the main adsorption site for the reaction substrates. Both sulfate and hydroxyl radicals were generated in the PMS activation process. The intermediates of BPA degradation were identified and the degradation pathways were proposed. This work is expected to help to elucidate the rational design and efficient synthesis of bimetallic materials for PMS activation.

Facile Fabrication of Z-Scheme Bi2WO6/WO3 Composites for Efficient Photodegradation of Bisphenol A with Peroxymonosulfate Activation

“…Bisphenol A (BPA), as one of a well-known endocrine disrupting compounds (EDCs), has become an environmental concern [1][2][3]. BPA can be lethal to humans or cause reproductive impairment, diabetes, neurological disorders, cardiovascular disease, and carcinogenic sensitivity [1,3].…”

“…BPA is usually used as the raw material for the preparation of epoxy resins, plastics, food containers, water pipes, toys, coatings, medical equipment, and electronics [4,5]. The United States (US) Environmental Protection Agency (EPA) reports that a lot of BPA has entered to the aquatic environment, resulting the ubiquitous presence of BPA in underwater and surface water [2,3]. Thus, it is notably urgent to seek effective techniques to remove BPA from water bodies [1].…”

Efficient degradation of organic pollutants by peroxymonosulfate activated with MgCuFe-layered double hydroxide

“…In the process, $OH is generated through the reaction between SO 4 c À and OH À /H 2 O (eqn (6) and (7)). 46 In addition, Cu(I) could reduce Fe(III) to Fe(II) (eqn (8)). 8 The generated SO 4 c À radicals (E 0 ¼ 2.5-3.1 V) and $OH radicals (E 0 ¼ 1.8-2.7 V) can react with organic pollutants rapidly due to their high redox potentials (eqn (9)).…”

Metallic Active Sites on MoO2(110) Surface to Catalyze Advanced Oxidation Processes for Efficient Pollutant Removal

“…Recently, sulfate radical (SO 4 ,À )-based AOPs have drawn much interests Yun et al, 2018;Chen et al, 2018) due to their higher oxidation potentials (SO 4 ,À , 2.5-3.1 eV) compared with hydroxyl radical ( , OH, 2.8 eV), longer half-life, higher selectivity (Li et al, 2018;Huang et al, 2017;Hu et al, 2017), and tolerance to wider pH range (2-8) (Ghanbari and Moradi, 2017). Peroxymonosulfate (PMS) molecules are widely used as a source for sulfate radicals in AOPs, which can be activated during the treatment process through various methods such as heating (Chen et al, 2016), UV light (Guan et al, 2011), transition metal ions, and ultrasound (Liu et al, 2017;Du et al, 2018a).…”