Development of metal tungstate-based composite films for organic compounds degradation

การพัฒนาฟิล์มวัสดุผสมที่มีโลหะทังสเตทเป็นฐานสำหรับการย่อยสลายสารประกอบอินทรีย์

Name: Sudarat Issarapanacheewin

Classification :.DDC: 669.734

LCSH: Tungsten

Abstract: This research was successfully synthesized the metal tungstate-based composite including ZnWO4/Bi2WO6, CeO2/Bi2WO6 and Ag-doped Bi2WO6/Bi14W2O27 composite. The pure ZnWO4, pure Bi2WO6, ZnWO4/Bi2WO6 and CeO2/Bi2WO6 composites in powder form were prepared by a hydrothermal method. The pure CeO2 powder was synthesized by a homogeneous precipitation method. After that, the films were fabricated via a doctor blading method for ZnWO4/Bi2WO6 and CeO2/Bi2WO6 composite films. The Ag-doped Bi2WO6/Bi14W2O27 composite film was fabricated by a chemical deposition method. The physicochemical of all samples was characterized using X-ray Diffraction (XRD), Raman spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray Spectroscopy (EDS), Brunauer-Emmett-Teller (BET) specific surface area, Barrett-Joyner-Halenda (BJH) pore size, Photoluminescence (PL), X-ray Photoelectron Spectroscopy (XPS), and UV-vis Spectroscopy. Rhodamine B (RhB), Methylene blue (MB) and the mixed dyes (RhB and MB) were employed for organic pollutants to evaluate the photocatalytic performance of all samples under simulated solar light and visible light irradiations. The photocatalytic performance was observed that the 0.2ZnWO4/0.8Bi2WO6 composite powder exhibits the efficiency of 69.45% for MB degradation (concentration at 3.126105 mol/L) under simulated solar light irradiation in 2 hours. The 0.5ZnWO4/0.5Bi2WO6 composite film shows the good photocatalytic performance of MB and RhB degradation under simulated light irradiation in 2 hours. It can degrade MB and RhB for 58.49% and 39.89%, respectively, at the concentration of 0.2105 mol/L. The photocatalytic activity of the 0.4CeO2/0.6Bi2WO6 composite film can degrade RhB for 44.40% at the concentration of 0.2105 mol/L under visible light irradiation in 2 hours. The photocatalytic efficiency of 5.0%Ag-doped Bi2WO6/Bi14W2O27 composite film was found to be 57.07% for RhB degradation at the concentration of 0.125105 mol/L under visible light irradiation for 7 hours.

Chiang Mai University Library

Address: CHIANG MAI

Email: cmulibref@cmu.ac.th

Name: Wiyong Kangwansupamonkon

Role: Chairman

Name: Natda Wechakun

Role: Member

Name: Sumet Sakulsermsuk

Role: Member

Name: Chanokporn Chaiwong

Role: Member

Name: Supab Choopun

Email : Menber

Created: 2018

Modified: 2563-01-13

Issued: 2019-12-23

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: Th 669.734 S943D

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Materials Science

Grantor: Chiang Mai University

©copyrights Chiang Mai University

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