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Porous Photo-Fenton Catalysts Rapidly Triggered by Levodopa-Based Mussel-Inspired Coatings for Enhanced Dye Degradation and Sterilization
Langmuir ( IF 3.7 ) Pub Date : 2022-07-26 , DOI: 10.1021/acs.langmuir.2c00999 Shang-Jin Yang 1, 2 , Zhi-Yuan Xu 1, 2 , Ling-Yun Zou 1, 2 , Jiong-Chi Yu 1, 2 , Jian Ji 1, 2 , Zhi-Kang Xu 1, 2
Langmuir ( IF 3.7 ) Pub Date : 2022-07-26 , DOI: 10.1021/acs.langmuir.2c00999 Shang-Jin Yang 1, 2 , Zhi-Yuan Xu 1, 2 , Ling-Yun Zou 1, 2 , Jiong-Chi Yu 1, 2 , Jian Ji 1, 2 , Zhi-Kang Xu 1, 2
Affiliation
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The advanced oxidation process of the photo-Fenton reaction can produce hydroxyl radicals with extremely strong oxidizing properties for the efficient and green degradation of various chemical and microbial pollutants. Herein, we report an approach to fabricating heterogeneous Fenton catalysts of β-FeOOH nanorods on porous substrates triggered by mussel-inspired coatings of levodopa (3,4-dihydroxy-phenyl-l-alanine, l-DOPA) and polyethylenimine (PEI) for efficient photocatalytic dyes’ degradation and sterilization. The l-DOPA-based coatings not only promote the formation and immobilization of β-FeOOH nanorods on the porous substrates by strong coordination between catechol/carboxyl groups and Fe3+ but also improve the energy band structure of the Fenton catalysts through a valence band blue shift and band gap narrowing. The photo-Fenton catalysts prepared by the l-DOPA-based coatings exhibit high electron transport efficiency and improved utilization of sunlight. Only 2 h of mineralization is needed to fabricate these catalysts with excellent photocatalytic efficiency, in which the degradation efficiency of methylene blue can reach 99% within 30 min, whereas the sterilization efficiency of E. coli/S. aureus can reach 93%/94% within 20 min of the photo-Fenton reaction. Additionally, the prepared catalysts reveal a high photodegradation performance for various dyes including methylene blue, methyl blue, methyl orange, direct yellow, and rhodamine B. Furthermore, the catalysts retain high dye degradation efficiencies of above 90% after five photodegradation cycles, indicating cycling performance and good stability.
中文翻译：
由基于左旋多巴的贻贝启发涂层快速触发的多孔光芬顿催化剂用于增强染料降解和灭菌
光-芬顿反应的高级氧化过程可以产生具有极强氧化性的羟基自由基，用于高效绿色降解各种化学和微生物污染物。在此，我们报告了一种在多孔基材上制备多相 Fenton 催化剂的方法，该催化剂由受贻贝启发的左旋多巴（3,4-二羟基-苯基-L-丙氨酸，L - DOPA）和聚乙烯亚胺（PEI）涂层引发高效的光催化染料降解和杀菌。l -DOPA 基涂层不仅通过邻苯二酚/羧基与 Fe 之间的强配位促进 β -FeOOH 纳米棒在多孔基材上的形成和固定化3+还可以通过价带蓝移和带隙变窄来改善 Fenton 催化剂的能带结构。由l -DOPA 基涂层制备的光芬顿催化剂表现出高电子传输效率和提高的阳光利用率。只需矿化2小时即可制备出具有优异光催化效率的催化剂，其中亚甲蓝的降解效率可在30分钟内达到99%，而大肠杆菌/金黄色葡萄球菌的杀菌效率在光-芬顿反应的 20 分钟内可以达到 93%/94%。此外，制备的催化剂对亚甲蓝、甲基蓝、甲基橙、直接黄和罗丹明 B 等多种染料均表现出较高的光降解性能。此外，该催化剂在 5 次光降解循环后仍保持 90% 以上的高染料降解效率，表明循环性能好，稳定性好。
更新日期：2022-07-26
中文翻译：
由基于左旋多巴的贻贝启发涂层快速触发的多孔光芬顿催化剂用于增强染料降解和灭菌
光-芬顿反应的高级氧化过程可以产生具有极强氧化性的羟基自由基，用于高效绿色降解各种化学和微生物污染物。在此，我们报告了一种在多孔基材上制备多相 Fenton 催化剂的方法，该催化剂由受贻贝启发的左旋多巴（3,4-二羟基-苯基-L-丙氨酸，L - DOPA）和聚乙烯亚胺（PEI）涂层引发高效的光催化染料降解和杀菌。l -DOPA 基涂层不仅通过邻苯二酚/羧基与 Fe 之间的强配位促进 β -FeOOH 纳米棒在多孔基材上的形成和固定化3+还可以通过价带蓝移和带隙变窄来改善 Fenton 催化剂的能带结构。由l -DOPA 基涂层制备的光芬顿催化剂表现出高电子传输效率和提高的阳光利用率。只需矿化2小时即可制备出具有优异光催化效率的催化剂，其中亚甲蓝的降解效率可在30分钟内达到99%，而大肠杆菌/金黄色葡萄球菌的杀菌效率在光-芬顿反应的 20 分钟内可以达到 93%/94%。此外，制备的催化剂对亚甲蓝、甲基蓝、甲基橙、直接黄和罗丹明 B 等多种染料均表现出较高的光降解性能。此外，该催化剂在 5 次光降解循环后仍保持 90% 以上的高染料降解效率，表明循环性能好，稳定性好。
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