Photocatalytic degradation of cationic dye in aqueous solution by TiO 2 nanoparticle immobilized on termite hill soil
- PDF / 825,704 Bytes
- 17 Pages / 439.37 x 666.142 pts Page_size
- 40 Downloads / 203 Views
Photocatalytic degradation of cationic dye in aqueous solution by TiO2 nanoparticle immobilized on termite hill soil Adeyinka S. Yusuff1 Received: 20 June 2020 / Accepted: 8 October 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract This work presented the preparation and characterization of T iO2/termite hill soil (TiO2-THS) and its photocatalytic application for cationic dye (methylene blue, MB) degradation in an aqueous solution. The TiO2-THS was prepared using the impregnation method. The material properties were characterized using techniques such as gas sorption, SEM, FTIR, XRF and XRD. Optimization of photocatalytic degradation of MB under visible light irradiation was carried out using Taguchi design approach. The effects of parameters affecting the photocatalytic degradation process, pH, initial concentration, irradiation time and photocatalyst loading, were examined. It was identified that the optimum values of the concentration, pH, time and photocatalyst loading were 50 mg/L, 6.0, 90 min and 0.5 g/L, respectively. At these optimum conditions, the predicted and experimental decolorization efficiencies were 96.31% and 95.76%, respectively. MB dye was almost completely mineralized after 90 min of visible light irradiation in the presence of the T iO2-THS catalyst. The prepared photocatalyst exhibited better stability and maintained its initial activity after being reused for six successive runs with a decolorization efficiency of 86.62%. Keywords Photocatalysis · Methylene blue · Photodegradation · Taguchi design approach · Mineralization
Introduction Discharge of untreated wastewater from the textile industry poses a serious threat to humans and the ecosystem. Large volumes of wastewater are often generated in textile mills, which represent a recurring issue in countries where small and medium scale textile industries exist. Over the years, most researchers have adopted various * Adeyinka S. Yusuff [email protected] 1
Department of Chemical and Petroleum Engineering, College of Engineering, Afe Babalola University, Ado‑Ekiti, Nigeria
13
Vol.:(0123456789)
Reaction Kinetics, Mechanisms and Catalysis
kinds of treatment methods in order to decolorize or degrade the dye house effluent [1, 2]. However, most of these treatment techniques reported either pave way for secondary pollutants or require a longer duration to completely remove the pollutant in the colored wastewater [3]. For example, adsorption, membrane, coagulation-flocculation and reverse osmosis encourage the movement of a pollutant from one medium to another, which in turn create secondary pollutant [3, 4]. Besides, the adsorbent usually loses its stability due to the blockage of the sorption sites, which implies that it could not be reused [5]. The biological method of treatment is associated with some limitations such as toxicity, longer time to degrade pollutants and low biodegradability [6]. As physicochemical and biological treatment methods could not effectively remove the organic pollutants in industrial eff
Data Loading...
