Accelerated the continuous production of ROS at the concentrated alkaline solution driven by O2 microbubbles

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-03-15 DOI:10.1016/j.cej.2025.161600

Wenbin Hu, Huiquan Li, Chenye Wang, Xinjuan Hou, Chanjuan Zhang, Hao Du, Jun Li

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引用次数: 0

Abstract

Reactive oxygen species (ROS) play a central role in degrading many environmental pollutants and oxidizing low-valence metal ions due to their high oxidation potential and environmental sustainability. However, due to the influence of the solution coordination environment, it is always difficult to regulate the species and concentration of short-lived ROS. In this work, we first qualitative and quantified the ROS species including O₂^•−, HO₂⁻, and •OH, with the concentrations as high as 147 μM. DFT calculation suggested that inducing O₂ molecule can intensify charge depletion around NaOH and then accelerate the single electron reduction of O₂, where the concentration of ROS elevated from 0.12 mM to 5.34 mM after employing a fine-bubble diffuser to form O₂ microbubbles. Additionally, it was found the addition of Fe²⁺/Fe³⁺ can regulate the formation of •OH and O₂^•− by Fenton-like reactions and stabilize the concentration of O₂^•− at 25.67 to 37.07 μM. Based on this, a micro-bubbles reactor was manufactured to increase the oxidation and leaching efficiency of low-valence V(III) and Cr(III) by 17.5 ∼ 41 times, realize the efficient recovery of V(V) and Cr(VI) from vanadium slag. This study provides a comprehensive ROS profile in concentrated alkaline solutions, establishing a foundation for innovative approaches to enhance, control, and apply ROS production

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.