Fe Immobilized within Accordion-Like Tubular Carbon Nitride As a Catalyst for the Fenton-Like Degradation of Ranitidine: Synergetic Roles of •OH and 1O2

Yu Yin, Bing Hu, Abdul Hannan Asif, Chengzhang Zhu, Wenning Li, Linheng He, Sheng Cui, Shaobin Wang, Hongqi Sun

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Abstract

Advanced oxidation processes (AOPs) based on H2O2 are considered effective strategies to remove emerging organic pollutants from water bodies. In this work, Fenton-like Fe-based catalysts were fabricated through a simple hydrothermal calcination method. Fe was immobilized within carbon nitride with a structure of accordion-like hollow nanotubes enriched with open chinks (atCN). The Fe-atCN catalysts were employed for Fenton-like reactions to degrade ranitidine (RAN). Due to the unique structure of the atCN substrate and the Fe-N interactions established between highly dispersed Fe sites and the atCN matrix, the 3.4Fe-atCN/H2O2 system was able to completely eliminate RAN within 30 min at an initial pH of 3 (k = 0.143 min-1). It also remained highly active after four cycles of regeneration. Moreover, the 3.4Fe-atCN/H2O2 system showed good adaptability in a pH range of 3-6, with coexisting inorganic anions, and in diverse water bodies. Good oxidative activities on various pollutants were also demonstrated, including sulfamethoxazole, tetracycline, 4-chlorophenol, and methyl orange. Afterward, mechanism exploration suggested that the dominant reactive oxygen species driving the degradation of RAN in the 3.4Fe-atCN/H2O2 system were not only the generally reported •OH but also the unexpected nonradical of 1O2. The activation mechanism of 3.4Fe-atCN to H2O2, intermediates, and degradation pathways of RAN were then unveiled for providing further guidance to the development of Fenton-like technology.

Original languageEnglish
Pages (from-to)15165-15175
Number of pages11
JournalIndustrial and Engineering Chemistry Research
Volume63
Issue number34
DOIs
Publication statusPublished - 28 Aug 2024

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