Strong enhancement on dye photocatalytic degradation by ball-milled TiO2: A study of cationic and anionic dyes
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 = 0.78 μm, specific surface area = 88.17 m2 g−1, pore volume = 0.41 cm3 g−1), the 60 min ball-milled TiO2 (d50 = 0.55 μm, specific surface area = 99.48 m2 g−1, pore volume = 0.48 cm3 g−1) enhanced the adsorption quantity of congo red and methylene blue from 10.4 mg g−1 to 13.6 mg g−1, and from 17.0 mg g−1 to 22.2 mg g−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).
Keywords
[RstdPub], Ball-milled TiO2, congo red, equilibrium adsorption, methylene blue, photocatalysis, adsorption, alkalinity, aromatic compounds, azo dyes, ball milling, degradation, dyes, milling (machining), particle size, pH, photocatalysis, scanning electron microscopy, specific surface area, titanium dioxide, x ray diffraction, brunauer emmett tellers, cationic and anionic dyes, congo red, degradation efficiency, Dubinin-Radushkevich, equilibrium adsorption, methylene blue, photo catalytic degradation, particle size analysis
Document Type
Journal Article
Date of Publication
2017
Publication Title
Journal of Materials Science & Technology
Publisher
Elsevier
School
School of Engineering
RAS ID
24471
Copyright
subscription content
Comments
Jia, Z., La, L. B. T., Zhang, W. C., Liang, S. X., Jiang, B., Xie, S. K., ... Zhang, L. C. (2017). Strong enhancement on dye photocatalytic degradation by ball-milled TiO 2: A study of cationic and anionic dyes. Journal of Materials Science & Technology. 33(8), 856-863. https://doi.org/10.1016/j.jmst.2017.02.006