Microwave-assisted hydrothermal synthesis of CuWO4-palygorskite nanocomposite for enhanced visible photocatalytic response

Autor(es):Mostrar menos -

Lima, A. E. B. ^[1] ; Reis, R. Y. N. ^{[1, 2]} ; Ribeiro, L. S. ^[3] ; Ribeiro, L. K. ^[3] ; Assis, M. ^[3] ; Santos, R. S. ^{[1, 2]} ; Fernandes, C. H. M. ^[4] ; Cavalcante, L. S. ^[2] ; Longo, E. ^[3] ; Osajima, J. A. O. ^[5] ; Luz Jr, G. E.

Afiliação do(s) autor(es)

^[1] Fed Univ Piaui UFPI, Dept Chem DQ, BR-64049550 Teresina, Piaui - Brazil

^[2] State Univ Piaui UESPI, PPGQ GERATEC DQ, 2231 Joao Cabral St, POB 381, BR-64002150 Teresina, Piaui - Brazil

^[3] Univ Fed Sao Carlos, CDMF UFSCar, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[4] Fed Univ Sao Carlos UFSCar, Chem Dept, Electrochem Res Lab LAPE, Washington Luis Rd Km 235, BR-13566905 Sao Carlos, SP - Brazil

^[5] Univ Fed Piaui, Interdisciplinary Lab Adv Mat LIMAV, BR-64049550 Teresina, Piaui - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 863, MAY 15 2021.
• Citações Web of Science: 4

Resumo

CuWO4-Pal nanocomposite formed by copper (II) tungstate nanoparticles with palygorskite clay mineral (Pal) was synthesized via coprecipitation method followed by microwave-assisted hydrothermal technique and applied in the photodegradation of the antibiotic ciprofloxacin (CIP) using visible-light irradiation. The formation of CuWO4-Pal nanocomposite was confirmed by XRD, Raman spectroscopy and DRIFT studies. Xray photoelectron spectroscopy (XPS) and photoelectrochemical studies of the nanocomposite showed structural changes, which induced the formation of oxygen vacancies and better charge carrier mobility. Field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) images revealed the fibrous morphology of Pal as well as the control of CuWO4 crystal growth with the formation of the nanocomposite. The CIP photodegradation was influenced by the adsorption power and the pH solution. CuWO4-Pal exhibited 92% of CIP photodegradation and 50% of total organic carbon (TOC) removal using an initial concentration of 8 mg L-1 at pH 10 after 90 min. Together with the photoelectrochemical study, the scavengers used indicated that the hole (+h) is the main oxidative species in CIP photodegradation. (C) 2021 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs