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Magnetic CoFe alloy–Co supported on mesoporous carbon as an efficient catalyst for the degradation of bensulfuron-methyl: insight into the effect of calcination temperature on carbon defects and singlet oxygen
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-09-10 , DOI: 10.1039/d4ta03834g Chao Yuan 1 , Jialing Sheng 1 , Shuke Guo 1 , Xiaoyu Wang 1 , Jiangyan Xu 1 , Hongmei Jiang 1
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-09-10 , DOI: 10.1039/d4ta03834g Chao Yuan 1 , Jialing Sheng 1 , Shuke Guo 1 , Xiaoyu Wang 1 , Jiangyan Xu 1 , Hongmei Jiang 1
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In this work, a magnetic CoFe alloy and Co supported on mesoporous carbon with abundant defects (CoFe–Co/MC) was prepared by a sol–gel method combined with calcination and applied to activate peroxymonosulfate (PMS) and efficiently remove bensulfuron methyl (BSM) from water. CoFe–Co/MC could degrade 95% of BSM, while Co or Fe without supported mesoporous carbon could only provide degradation efficiencies below 10%, indicating that the introduction of mesoporous carbon could effectively enhance catalytic activity. Moreover, the dissolution of Co2+ from CoFe–Co/MC is only 0.22 mg L−1, which is about 20% of Co/MC, indicating that the bimetallic composite effectively inhibits the dissolution. The results of radical scavenger and EPR experiments demonstrated that 1O2 played the leading role in degradation process, while SO4˙− and small amounts of ˙OH and O2˙− were also involved in the degradation. The results of p-BQ scavenger and N2 atmosphere experiments showed that 1O2 mainly originated from the interaction between carbon defects and dissolved oxygen. The degradation performance of the CoFe–Co/MC/PMS system, carbon defect content and 1O2 content all increased with the increase of pyrolysis temperature, which demonstrated that adjusting pyrolysis temperature can regulate carbon defect content and 1O2 content, further improving catalytic activity. Possible BSM degradation pathways of CoFe–Co/MC/PMS were investigated in detail. This research provides new insights into the design and construction of metal–carbon catalysts rich in carbon defects and reveals how to regulate carbon defect content, 1O2 content and catalytic performance.
中文翻译：
磁性CoFe合金-介孔碳负载的Co作为苄嘧磺隆降解的有效催化剂：深入了解煅烧温度对碳缺陷和单线态氧的影响
在这项工作中，通过溶胶-凝胶法结合煅烧制备了磁性CoFe合金和Co负载在具有丰富缺陷的介孔碳（CoFe-Co/MC）上，并用于活化过一硫酸盐（PMS）并有效去除苯嘧磺隆（BSM） ）从水中。 CoFe-Co/MC可以降解95%的BSM，而没有负载介孔碳的Co或Fe只能提供低于10%的降解效率，表明介孔碳的引入可以有效增强催化活性。此外，CoFe-Co/MC中Co 2+的溶解量仅为0.22 mg L -1 ，约为Co/MC的20%，表明该双金属复合材料有效地抑制了溶解。自由基清除剂和EPR实验结果表明， 1 O 2在降解过程中起主导作用，SO 4 ˙ -以及少量的˙OH和O 2 ˙ -也参与了降解。 p -BQ清除剂和N 2气氛实验结果表明， 1 O 2主要来源于碳缺陷和溶解氧之间的相互作用。 CoFe-Co/MC/PMS体系的降解性能、碳缺陷含量和1 O 2含量均随着热解温度的升高而增加，这表明调节热解温度可以调节碳缺陷含量和1 O 2含量，进一步改善催化活性。详细研究了 CoFe-Co/MC/PMS 可能的 BSM 降解途径。这项研究为富含碳缺陷的金属碳催化剂的设计和构建提供了新的见解，并揭示了如何调节碳缺陷含量、 1 O 2含量和催化性能。
更新日期：2024-09-10
中文翻译：
磁性CoFe合金-介孔碳负载的Co作为苄嘧磺隆降解的有效催化剂：深入了解煅烧温度对碳缺陷和单线态氧的影响
在这项工作中，通过溶胶-凝胶法结合煅烧制备了磁性CoFe合金和Co负载在具有丰富缺陷的介孔碳（CoFe-Co/MC）上，并用于活化过一硫酸盐（PMS）并有效去除苯嘧磺隆（BSM） ）从水中。 CoFe-Co/MC可以降解95%的BSM，而没有负载介孔碳的Co或Fe只能提供低于10%的降解效率，表明介孔碳的引入可以有效增强催化活性。此外，CoFe-Co/MC中Co 2+的溶解量仅为0.22 mg L -1 ，约为Co/MC的20%，表明该双金属复合材料有效地抑制了溶解。自由基清除剂和EPR实验结果表明， 1 O 2在降解过程中起主导作用，SO 4 ˙ -以及少量的˙OH和O 2 ˙ -也参与了降解。 p -BQ清除剂和N 2气氛实验结果表明， 1 O 2主要来源于碳缺陷和溶解氧之间的相互作用。 CoFe-Co/MC/PMS体系的降解性能、碳缺陷含量和1 O 2含量均随着热解温度的升高而增加，这表明调节热解温度可以调节碳缺陷含量和1 O 2含量，进一步改善催化活性。详细研究了 CoFe-Co/MC/PMS 可能的 BSM 降解途径。这项研究为富含碳缺陷的金属碳催化剂的设计和构建提供了新的见解，并揭示了如何调节碳缺陷含量、 1 O 2含量和催化性能。
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