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

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2017,（8）
• 页码范围: 856-863
• 页数: 8页
• 语种: 英文

摘要

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 cm3g-1),the 60min ballmilled TiO2 (d50 =0.55 μm,specific surface area =99.48 m2 g-1,pore volume =0.48 cm3g1) enhanced the adsorption quantity of congo red and methylene blue from 10.4mgg-1 to 13.6mgg-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).