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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/044/0005

    • Keywords

       

      Photocorrosion; pH; zinc oxide; photodegradation; Rhodamine B.

    • Abstract

       

      This research aims to study the synergistic effect of pH solution and photocorrosion of ZnO particles on the photodegradation of Rhodamine B (RhB) dye. The stability of ZnO particles was investigated by zeta potential measurement. The structure, morphology and photocatalytic activity of ZnO were analysed by X-ray diffraction, scanning electron microscope and ultraviolet–visible spectrophotometer, respectively. The ZnO particles were highly crystallinewith a bandgap energy of 3.23 eV. The surface charges of particles were found to be pH-sensitive, where they were more negative under alkaline condition, i.e., $-$11.1, $-$5.3 and $-$38.2 mV at pH 3, 7 and 11, respectively. ZnO particles that dissolved in pH 3 solution produce Zn$^{2+}$ ions, while precipitation of Zn(OH)$_4^{2-}$ was observed in pH 11 solution, resulting in morphology change of ZnO from rod shape to lamellar shape. The synergistic effect of photocorrosion and dissolution of ZnO particles in acidic solution reduced RhB dye removal efficiency from $\sim$90% at pH 7 to $\sim$70% at pH 3. In alkalinesolution, ZnO particles displayed remarkable reusability as it still recorded a 94.8% degradation efficiency after five successive cycles.

    • Author Affiliations

       

      ANH THI LE1 NURUL SYUHADA BINTI SAMSUDDIN1 SIN-LING CHIAM1 SWEE-YONG PUNG1

      1. School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Malaysia

    • Dates

       
      Published
      3 February 2021
      Manuscript received
      21 March 2020
      Accepted
      8 July 2020
      Final version published online
      3 February 2021

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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