Solar photocatalytic application of NbO2OH as alternative photocatalyst for water treatment

Luana Márcia Bezerra Batista, Alexsandro Jhones dos Santos, Djalma Ribeiro da Silva, Ana Paula de Melo Alves, Sergi Garcia-Segura, Carlos Alberto Martínez-Huitle

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Water recycling and industrial effluents remediation are a hot topic of research to reduce the environmental impact of the human activity. Persistent organic pollutants are highly recalcitrant compounds with hazardous effects associated to their fate in water bodies. Several novel technologies have been developed during the last decades to deal with this novel contamination. However, the natural sources and idiosyncrasy of each country lead to the potential application of different technologies. In this context, we have focused on the development of phocotalytic treatment of solutions containing dyes using a novel photocatalytic material, the NbO2OH. The NbO2OH was synthesized and characterized with different techniques. Several assays demonstrated the solar photoactivity of this novel oxyhydroxide catalyst, achieving complete decolorizations after 10 min of treatment under optimal conditions of 1.0 g L− 1 NbO2OH photocatalyst loading, 0.1 M of H2O2 as electron scavenger, pH 4.0 and methyl orange concentrations up to 15 mg L− 1. Also, the catalyst recuperation demonstrated the potential reuse of this photocatalyst without losing catalytic response after five cycles. This work is of significant importance because niobium is a natural resource, mainly extracted in Brazil and the annual global sunlight irradiation in the near-equatorial region of northeast Brazil is over the average solar irradiation of the planet. Thus, the solar photocatalytic treatment using NbO2OH in northeast Brazil appears as a highly potential environmental-friendly nanotechnology to mitigate the water pollution.

Original languageEnglish (US)
Pages (from-to)79-86
Number of pages8
JournalScience of the Total Environment
Volume596-597
DOIs
StatePublished - Oct 15 2017

Keywords

  • Advanced oxidation process
  • Azo dye
  • Methyl orange
  • Nanotechnology
  • Niobium
  • Solar photocatalysis

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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