Research Article

Environmental Science and Pollution Research

, Volume 20, Issue 6, pp 3751-3759

Titania-supported silver-based bimetallic nanoparticles as photocatalysts

  • M. A. BarakatAffiliated withDepartment of Environmental Sciences, King Abdulaziz UniversityCentral Metallurgical R & D Institute Email author 
  • , R. I. Al-HutailahAffiliated withDepartment of Environmental Sciences, King Abdulaziz University
  • , M. H. HashimAffiliated withDepartment of Environmental Sciences, King Abdulaziz University
  • , E. QayyumAffiliated withChemical & Biomedical Engineering Department, University of South Florida
  • , J. N. KuhnAffiliated withChemical & Biomedical Engineering Department, University of South Florida

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

Abstract

Photocatalytic process has shown recently a great potential as an environmental friendly and clean remediation technology for organic pollutants in wastewater. This work described the synthesis of silver-based bimetallic nanoparticles using colloid chemistry and the subsequent immobilization onto titania to form composite photocatalytic materials (titania-supported Ag–Pt nanoparticles). The photocatalysts were characterized by X-ray diffraction, electron microscopy, and nitrogen physisorption. The catalytic activity of the photocatalysts was evaluated by photocatalytic degradation of phenol and 2-chlorophenol (2-CP) in synthetic wastewater solutions. The photocatalytic processes were conducted in a batch photoreactor containing appropriate solutions of phenol and 2-CP with UV irradiation of 450 W. UV-visible spectrophotometer was used for analyzing the concentration of phenol and 2-CP in solutions. Parameters affecting the photocatalytic process such as the solution pH, phenol and 2-CP concentrations, and catalyst concentration were investigated. The results obtained revealed that TiO2-supported Ag/Pt nanoparticles showed a higher activity for UV-photocatalytic degradation of both phenol and 2-CP pollutants in the solution (as compared to the plain rutile TiO2). The photodegradation processes were optimized by the 0.5-g/L catalyst with a pollutant concentration of 50 mg/L for all the samples. Complete degradation for both phenol and 2-CP was achieved after 120 min.

Keywords

Nanoparticle synthesis Plasmonics TiO2-supported Ag/Pt Photocatalysis Phenolic pollutants Wastewater