Insights into the synergistic role of photocatalytic activation of peroxymonosulfate by UVA-LED irradiation over CoFe2O4-rGO nanocomposite towards effective Bisphenol A degradation: Performance, mineralization, and activation mechanism

双酚A 化学 纳米复合材料 降级(电信) 激进的 核化学 光催化 腐植酸 氧化物 化学工程 硫酸盐 羟基自由基 催化作用 有机化学 环氧树脂 工程类 电信 肥料 计算机科学
作者
Aydin Hassani,Paria Eghbali,Fayyaz Mahdipour,Stanisław Wacławek,Kun‐Yi Andrew Lin,Farshid Ghanbari
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:453: 139556-139556 被引量:224
标识
DOI:10.1016/j.cej.2022.139556
摘要

In this work, CoFe2O4-reduced graphene oxide (CFO-rGO) nanocomposite was synthesized to activate peroxymonosulfate (PMS) under UVA-LED irradiation. Bisphenol A (BPA) was selected as an emerging pollutant to evaluate the performance of the UVA-LED/CFO-rGO/PMS system. CFO-rGO was characterized by several advanced methods including XRD, FTIR, FESEM, EDX-mapping, TEM, XPS, BET-BJH, Raman spectrometry, VSM, PL, and EIS analyses. The operating factors, the determination of reactive species, and the mechanism were studied and discussed. During 30 min reaction time, more than 99% of BPA was removed by 150 mg/L PMS and 400 mg/L CFO-rGO under mild conditions (pH = 3–9). Bicarbonate ions could inhibit the BPA degradation by scavenging the free radicals. The trapping experiments exhibited that sulfate (SO4•-) and hydroxyl (•OH) radicals were prevailing agents for BPA degradation. Humic acid (HA) and sodium dodecyl sulfate (SDS) had a hindering effect on BPA degradation. CFO-rGO showed a high potential for recyclability up to six cycles. Moreover, the leaching of metals was approximately null for CFO-rGO, indicating that the current nanocomposite is highly stable. We also examined UVA-LED/CFO-rGO/PMS system on other pollutants, as well as real conditions. The results showed high efficiency for all conditions. The UVA-LED/CFO-rGO/PMS process could mineralize 67% of BPA during 80 min reaction time. Intermediates of BPA degradation were identified and their toxicity was also estimated. This work enlightened the ferrite catalysts' importance in activating PMS under UVA-LED irradiation for emerging pollutants wastewater remediation.
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