Facile synthesis of pyrite FeS2 on carbon spheres for high-efficiency Fenton-like reaction

• Published in: Chemosphere (Oxford) Vol. 355; p. 141799
• Main Authors: Ma, Chengbo, Liu, Yuexu, Wang, Jun, Evrard Deric, Nkuissi Tchikou, Li, Yang, Fan, Xiaobin, Peng, Wenchao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2024
• Subjects: Carbon spheres; Fe(III)/Fe(II) cycle; Fixed-bed reactor; Long-term stability; Pyrite FeS2; Carbon spheres; Fe(III)/Fe(II) cycle; Fixed-bed reactor; Pyrite FeS2; Long-term stability
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2024.141799

Designing iron-based catalysts for Fenton-like reactions with peroxymonosulfate (PMS) as oxidants have attracted growing attentions. Herein, pyrite FeS2 supported on carbon spheres (FeS2@C) is synthesized by a facile low-temperature method. The FeS2@C/PMS system can degrade carbamazepine (CBZ) effectively in a wide pH range. Sulfate radicals (SO4·-), hydroxyl radicals (·OH), superoxide radical (O2·-), and singlet oxygen (1O2) are the responsible reactive oxygen species (ROSs) for CBZ degradation. Moreover, in the simulated fixed-bed reactor, the FeS2@C/PMS system can maintain a high CBZ removal ratio of >95% for than 8 h, exhibiting its excellent stability. The outstanding performance of FeS2@C/PMS system is attributed to the presence of carbon spheres and lattice S2−, which together promote the Fe(III)/Fe(II) redox cycle. The FeS2@C is a promising catalyst due to its facile synthesis, low cost, high efficiency, and excellent stability to activate PMS for organics degradation. [Display omitted] •FeS2@C is synthesized by a facile low-temperature method.•The carbon spheres and lattice S2− promote the Fe(III)/Fe(II) redox cycle in FeS2@C/PMS system.•OH, SO4·-, 1O2, and O2·- are revealed to be the dominated reactive oxygen species.•The FeS2@C/PMS system exhibits excellent stability in the simulated fixed-bed reactor..