Biopolymer Gellan-Gum-Based TiO2: A Green Alternative Photocatalyst Approach for Removal of Pollutants

Author:

Xisto Marcelo Ribeiro1ORCID,Damacena Dihêgo Henrique L.1ORCID,de Araújo Francisca Pereira1,Alves Durcilene1,Honorio Luzia Maria Castro2,Peña-Garcia Ramon3,Almeida Luciano4ORCID,de Oliveira Joziel Alves1,Furtini Marcelo Barbosa1,Osajima Josy Anteveli1ORCID,Silva-Filho Edson Cavalcanti da1ORCID

Affiliation:

1. Interdisciplinary Laboratory for Advanced Materials (LIMAV), Teresina 64049-550, PI, Brazil

2. Center for Agrarian Sciences, Department of Chemistry and Physics, Federal University of Paraiba, Areia 58397-000, PB, Brazil

3. Academic Unit of Cabo de Santo Agostinho, Federal University of Pernambuco, Cabo de Santo Agostinho 54518-430, PE, Brazil

4. Chemical Engineering Department, Federal University of Pernambuco, Recife 50670-901, PE, Brazil

Abstract

Titanium dioxide TiO2/gellan gum (GG) in different compositions (1, 3, and 5% GG) was investigated to degrade methylene blue (MB) under UV light. XRD, SEM, and EDS confirmed the anatase phase. The textural properties demonstrated the formation of mesopores. The band gaps were 3.2 eV, 3.0 eV, and 2.9 eV. A photodegradation of MB of 95% was observed using the lowest gum concentration. It was attributed to the photogenerated radicals and the specific surface area. The FTIR spectra showed the photostability of the catalyst after successive cycles. The toxicity tests demonstrated no toxicity after dye degradation. Therefore, TiO2/GG is promising for the treatment of water.

Funder

CNPq

Publisher

MDPI AG

Subject

Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry

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