Promoting Effect of Silver Oxide Nanoparticles on the Oxidation of Bisphenol B by Ferrate(VI)

Abstract

Bisphenol B (BPB, 2,2-bis(4-hydroxyphenyl) butane), as a substitute for bisphenol A, has been widely detected in the environment and become a potential threat to environmental health. This work found that silver oxide nanoparticles (Ag 2 O) could greatly promote the removal of BPB by ferrate (Fe(VI)). With the presence of 463 mg/L Ag 2 O, the amount of Fe(VI) required for the complete removal of 10 μM BPB will be reduced by 70%. Meanwhile, the recyclability and stability of Ag 2 O have been verified by recycling experiments. The characterization results and in situ electrochemical analyses showed that Ag(II) was produced from Ag(I) in the Fe(VI)−Ag 2 O system, which has a higher electrode potential to oxidize BPB to enhance its removal. A total of 13 intermediates were identified by high-resolution mass spectrometry, and three main reaction pathways were proposed, including oxygen transfer, bond breaking, and polymerization. Based on the toxicity assessment through the ECOSAR program, it is considered that the presence of Ag 2 O reduced the toxicity of BPB oxidation intermediates to aquatic organisms. These results would deepen our understanding of the interaction between Fe(VI) and Ag 2 O, which may provide an efficient and environmentally friendly method for water and wastewater treatment.

Revisiting the Electron Transfer Mechanisms in Ru(III)-Mediated Advanced Oxidation Processes with Peroxyacids and Ferrate(VI)

“…Thus, far, it has been well documented that most metals, including Fe­(II), Co­(II) (SET may also occur, still in debate), , and Fe­(III)-complexes, ,, react with PAA through DET reactions. On the other hand, ferrate­(VI) oxidizes various metal species via SET, including Fe­(II), , Fe­(III), Ag­(I), and Cu­(II) . The underlying mechanisms could be delineated by computational chemistry methods and advanced high-valent metal chemistry.…”