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 d50=0.78μm, specific surface area=88.17m2g−1, pore volume=0.41cm3g−1), the 60min ball-milled TiO2 (d50=0.55μm, specific surface area=99.48m2g−1, pore volume=0.48cm3g−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).
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