Enhanced degradation of textile wastewater by plasma-irradiated titanium dioxide

Two techniques, contact glow discharge plasma and photocatalysis, have been combined by using plasma energy to activate TiO2 and enhance chemical oxygen demand (COD), colour and turbidity removal of a real textile wastewater. Optimization of the photocatalyst amount and the suspension pH has been ca...

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Bibliographic Details
Published in:	Desalination and water treatment Vol. 212; pp. 254 - 260
Main Authors:	dos Santos, Thiago Damião, Ueda, Ana Cláudia, Ferrari, Ana Maria, dos Santos Ribeiro, Valquíria Ap
Format:	Journal Article
Language:	English
Published:	Elsevier Inc 01-02-2021
Subjects:	Contact glow discharge plasma Plasma Textile wastewater Titanium dioxide Contact glow discharge plasma Textile wastewater Plasma Titanium dioxide
Online Access:	Get full text
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Summary:	Two techniques, contact glow discharge plasma and photocatalysis, have been combined by using plasma energy to activate TiO2 and enhance chemical oxygen demand (COD), colour and turbidity removal of a real textile wastewater. Optimization of the photocatalyst amount and the suspension pH has been carried out by means of central composite design statistical method. The phytotoxicity of the treated wastewater has been assessed through Lactuca sativa seeds bioassays. The obtained results confirmed that the discharge plasma can induce the photoactivation of TiO2. The most significant factor for COD and turbidity reductions was pH, and TiO2 concentration for colour reduction. It was possible to remove about 94% of colour and 59% of COD, and at least, 33% of turbidity with 0.4 g L–1 of TiO2 at acid medium. After applying toxicity tests to treated samples, radical growth of Lactuca sativa seeds was higher than that found for the control (i.e., 114%).
ISSN:	1944-3986
DOI:	10.5004/dwt.2021.26632