Strong enhancement on dye photocatalytic degradation by ball-milled TiO2: A study of cationic and anionic dyes

Z. Jia, L. B T La, W. C. Zhang, S. X. Liang, B. Jiang, S. K. Xie, D. Habibi, L. C. Zhang

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    27 Citations (Scopus)

    Abstract

    TiO2 particles with desirable properties were produced by undergoing specific durations of ball milling. Characterizations of the TiO2 particles before and after ball milling were investigated via X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), particle size analysis, zeta potential, and scanning electron microscope (SEM). The equilibrium adsorption data were well fitted to Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherms. Compared to the as-received TiO2 (mean particle size d 50 = 0.78μm, specific surface area=88.17m2 g-1, pore volume=0.41cm3 g-1), the 60min ball-milled TiO2 (d 50 = 0.55μm, specific surface area=99.48m2 g-1, pore volume=0.48cm3 g-1) enhanced the adsorption quantity of congo red and methylene blue from 10.4mgg-1 to 13.6mgg-1, and from 17.0mgg-1 to 22.2mgg-1, respectively; and also improved the kinetic rates from k =0.1325 to 0.2193, and k =0.0944 to 0.1553, respectively. Dye adsorption and degradation efficiency of congo red was enhanced in acidic pH range (2-5.14), and methylene blue was enhanced in alkaline pH range (7.58-12).

    Original languageEnglish
    Pages (from-to)856-863
    Number of pages8
    JournalJournal of Materials Science and Technology
    Volume33
    Issue number8
    DOIs
    Publication statusPublished - Aug 2017

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