A review on the use of chelating agents as an alternative to promote photo-Fenton at neutral pH: Current trends, knowledge gap and future studies

Autor(es)

Ahile, Ungwanen J. ^[1] ; Wuana, Raymond A. ^[2] ; Itodo, Adams U. ^[2] ; Sha'Ato, Rufus ^[2] ; Dantas, Renato F. ^[3]

Afiliação do(s) autor(es)

^[1] Benue State Univ, Dept Chem, PMB 102119, Makurdi - Nigeria

^[2] Univ Agr, Dept Chem, PMB 2373, Makurdi - Nigeria

^[3] Univ Estadual Campinas, UNICAMP, Sch Technol, Paschoal Marmo 1888, BR-13484332 Limeira, SP - Brazil

• Tipo de documento: Artigo de Revisão
• Fonte: Science of The Total Environment; v. 710, MAR 25 2020.
• Citações Web of Science: 0

Resumo

In this review, we have critically examined the alternatives to conventional photo-Fenton process such as the strategies to perform it in circumneutral pH in the so-called photo-Fenton like process. They include iron chelation, iron replacement with another metal and use of iron immobilized on surfaces of solid materials, use of iron oxides, among others. The use of such strategies can be employed to overcome the challenges identified in conventional photo-Fenton, moreover, advantages and drawback of each technique must be clarified and the recent achievements should be shared with the scientific community. The use of a chelating agent to make iron soluble at circumneutral pH presents many advantages when compared to other current techniques. However, the correct understanding of the chelating process, complex activity and the complex resistance along with the mechanism of radical production should be taken into account to prepare an effective photo-Fenton with complexed iron. The review also identifies the current trends in chelate assisted photo-Fenton process and the unexplored areas in this field of study. A discussion about the environmental and safety issues in the application of these methods, with emphasis to the Fe chelation strategy, was also considered with detailed review over the past ten years. (C) 2019 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 14/17774-1 - Influência da composição do efluente secundário na desinfecção por processos oxidativos avançados
• Beneficiário: Renato Falcão Dantas
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores