Synergy between surface adsorption and photocatalysis during degradation of humic acid on TiO2/activated carbon composites

Gang Xue, Huanhuan Liu, Quanyuan Chen, Colin Hills, Mark Tyrer, Francis Innocent

    Research output: Contribution to journalArticle

    126 Citations (Scopus)

    Abstract

    A photocatalyst 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 15mg/L in a period of 3h. 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 0.1124mg/(Lmin) and 0.3402L/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.

    Original languageEnglish
    Pages (from-to)765-772
    Number of pages8
    JournalJournal of Hazardous Materials
    Volume186
    Issue number1
    Early online date23 Nov 2010
    DOIs
    Publication statusPublished - 15 Feb 2011

    Keywords

    • Adsorption
    • Granular activated carbon
    • Humic acid
    • Photocatalyst
    • Synergy
    • TiO

    ASJC Scopus subject areas

    • Health, Toxicology and Mutagenesis
    • Pollution
    • Waste Management and Disposal
    • Environmental Chemistry
    • Environmental Engineering

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