Synergy between surface adsorption and photocatalysis during degradation of humic acid on TiO2/activated carbon composites
Xue, Gang, Liu, Huanhuan, Chen, Quanyuan, Hills, Colin, Tyrer, Mark and Innocent, Francis (2011) Synergy between surface adsorption and photocatalysis during degradation of humic acid on TiO2/activated carbon composites. Journal of Hazardous Materials, 186 (1). pp. 765-772. ISSN 0304-3894 (doi:10.1016/j.jhazmat.2010.11.063)Full text not available from this repository.
Aphotocatalyst comprising nano-sized TiO2 particles on granular activated carbon (GAC) was prepared by a sol-dipping–gel process. The TiO2/GAC composite was characterized by scanning electron microscopy (SEM), X-ray diffractiometry (XRD) and nitrogen sorptometry, and its photocatalytic activity was studied through the degradation of humic acid (HA) in a quartz glass reactor. The factors influencing photocatalysis were investigated and the GAC was found to be an ideal substrate for nano-sized TiO2 immobilization.
A 99.5% removal efficiency for HA from solution was achieved at an initial concentration of 15 mg/L in a period of 3 h. It was found that degradation of HA on the TiO2/GAC composite was facilitated by the synergistic relationship between surface adsorption characteristics and photocatalytic potential. The fitting of experimental results with the Langmuir–Hinshelwood (L–H) model showed that the reaction rate constant and the adsorption constant values were 0.1124 mg/(L min) and 0.3402 L/mg. The latter is 1.7 times of the calculated value by fitting the adsorption equilibrium data into the Langmuir equation.
© 2010 Elsevier B.V. All rights reserved.
|Uncontrolled Keywords:||photocatalyst, TiO2, granular activated carbon, humic acid, adsorption, synergy|
|Subjects:||Q Science > QD Chemistry|
|School / Department / Research Groups:||School of Science|
School of Science > Centre for Contaminated Land Remediation Research Group
|Last Modified:||14 Aug 2013 12:20|
Actions (login required)