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
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
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DOI：
10.1016/j.cej.2022.139556
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发表时间：
2022-10-18
影响因子：
15.1
通讯作者：
Ghanbari, Farshid
中科院分区：
文献类型：
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作者：
Hassani, Aydin;Eghbali, Paria;Ghanbari, Farshid
在这项工作中，CoFe 2 O 4还原氧化石墨烯（CFO-rGO）纳米复合材料的合成，激活过一硫酸盐（PMS）在UVA-LED照射。双酚A（BPA）被选为新出现的污染物以评估UVA-LED/CFO-rGO/PMS系统的性能。采用XRD、FTIR、FESEM、EDX-mapping、TEM、XPS、BET-BJH、拉曼光谱、VSM、PL和EIS等先进的分析方法对CFO-rGO进行了表征。对操作条件、反应物种的测定和反应机理进行了研究和讨论。在温和条件下（pH = 3-9），150 mg/L的PMS和400 mg/L的CFO-rGO对BPA的去除率在99%以上。二价离子通过清除自由基抑制BPA的降解。捕集实验表明，SO 4中心点和（OH）-O中心点是BPA降解的主要自由基。腐殖酸（HA）和十二烷基硫酸钠（SDS）对BPA的降解有阻碍作用。CFO-rGO显示出高达六个循环的可回收性的高潜力。此外，CFO-rGO的金属浸出几乎为零，表明目前的纳米复合材料是高度稳定的。我们还研究了UVA-LED/CFO-rGO/PMS系统对其他污染物的影响，以及真实的条件。结果表明，在所有条件下都具有高效率。UVA-LED/CFO-rGO/PMS工艺在80 min的反应时间内可矿化67%的BPA。对BPA降解的中间产物进行了鉴定，并对它们的毒性进行了评价。这一工作揭示了铁氧体催化剂在UVA-LED照射下活化PMS用于新兴污染物废水修复的重要性。
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 center dot-) and hydroxyl ((OH)-O-center dot) 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.