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Removal of naphthalene from aqueous solutions by phosphorus doped-titanium dioxide coated on silica phosphoric acid under visible light

Banaei, B ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.5004/dwt.2021.27129
  3. Publisher: Desalination Publications , 2021
  4. Abstract:
  5. In this research, titanium dioxide-phosphorus (TiO2-P) immobilized on silica phosphoric acid (SPA) was prepared by a simple modified sol–gel method with SPA as a precursor instead of phosphoric acid. TiO2-P thin film photocatalyst immobilized on SPA as a novel high-efficiency photocatalyst was investigated to remove naphthalene as a toxic compound from wastewater. The novel resulting photocatalyst were characterized by energy-dispersive X-ray (EDX) and X-ray diffraction pattern revealed nano-photocatalyst TiO2-P with the average size of 15–20 nm. EDX analysis showed the presence of phosphorus elements in the crystalline structure of TiO2 and diffuse reflectance spectroscopy showed the energy bandgap narrowing and transfer of photocatalytic activity of TiO2-P to the visible region. The excellent photocatalytic activity of TiO2-P/SPA compared with TiO2-N,S as thin films coated on glass microspheres. The results showed that the optimal pH, time, concentration, and efficiency removal of naphthalene for TiO2-P were 5, 50 min, 25 mg/L, and 92.12% and TiO2-N,S catalyst were 5, 60 min, 25 mg/L, and 88.47%, respectively (P < 0.05). The removal of chemical oxygen demand in pH 5 for TiO2-N,S was obtained 79.26% and for TiO2-P was obtained 81.64%. In this research, the ability to use immobilized TiO2-P in SPA can be used as a new, effective and practical method in the treatment of water and industrial wastewater containing naphthalene in the presence of visible light. © 2021 Desalination Publications. All rights reserved
  6. Keywords:
  7. Aqueous solution ; Chemical oxygen demand ; Crystal structure ; Immobilization ; Light effect ; Naphthalene ; Phosphorus ; Photolysis ; Reflectance ; Silica ; Titanium ; Wastewater treatment
  8. Source: Desalination and Water Treatment ; Volume 224 , 2021 , Pages 187-196 ; 19443994 (ISSN)
  9. URL: https://www.deswater.com/DWT_abstracts/vol_224/224_2021_187.pdf