Study on Degradation of Textile Dyes by Photocatalytic Ozonation Assisted with Tin Doped Zinc Oxide Nanorods

Document Type : Research Paper

Authors

1 Department of Chemistry, Quaid-E-Millath Govt. College for Women, Chennai, India

2 Department of Physics, Quaid-E-Millath Govt. College for Women, Chennai, India

Abstract

   The current research work focuses on the synergistic effect of tin doped Zinc oxide(Sn- ZnO) nanorods in combination with ozonation for the degradation of dyes in the water released from textile industries. Well crystalline mono dispersed Sn doped ZnO (Sn-ZnO) nanorods have been synthesized by simple hydrothermal method.  The XRD results show the hexagonal wurtzite structure of the prepared catalyst. The result of EDAX and XPS revealed that Sn was doped in to ZnO lattices. FESEM image show that the sample possesses hexagonal rod morphology with an average of 1µm in length and 50 to 100nm in diameter.  Optical transmittance of the sample was recorded in the wavelength range of 300–800 nm, and the band gap was determined. The prepared nanocatalyst in combination with ozone is used for the photocatalytic ozonation (nano PCO) of the azo dyes taken for the present study. Nano PCO is carried out in a laboratory scale photocatalytic ozonation reactor.  The experiments were conducted under different ozone dosages (0.12-0.57 g/h), pH (3-9), catalyst dosage (0-2 g/L) and dye concentration (5-50 mg/L) to arrive at optimized reaction conditions for degradation of dyes by Sn-ZnO assisted PCO.  Three experimental sets (Sn-ZnO/UV, UV/O3 and Sn-ZnO/UV/O3) were carried out under optimized reaction conditions to prove the synergistic effect of ozone on Sn-ZnO.  Use of ozone with Sn-ZnO leads to 95% decolourisation of the dyes in 30 min and 79.4% mineralization in 180 min.   The reusability of the photocatalyst was checked six times and the results revealed that the efficiency of the sample slightly decreased at the end of sixth cycle.  Based on the above results, the current route is promising for the application of Sn-ZnO based nanocatalyst in combination with ozonation for wastewater treatment.

Keywords

Main Subjects

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International Journal of Nanoscience and Nanotechnology
Volume 20, Issue 1
March 2024
Pages 63-76

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