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

    110 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

    Fingerprint

    Humic Substances
    Photocatalysis
    Activated carbon
    humic acid
    Adsorption
    activated carbon
    Carbon
    adsorption
    Degradation
    degradation
    Composite materials
    Quartz
    Polymethyl Methacrylate
    Photocatalysts
    Immobilization
    Electron Scanning Microscopy
    reaction rate
    immobilization
    Sol-gel process
    Reaction rates

    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

    Cite this

    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; Innocent, Francis.

    In: Journal of Hazardous Materials, Vol. 186, No. 1, 15.02.2011, p. 765-772.

    Research output: Contribution to journalArticle

    Xue, Gang ; Liu, Huanhuan ; Chen, Quanyuan ; Hills, Colin ; Tyrer, Mark ; Innocent, Francis. / Synergy between surface adsorption and photocatalysis during degradation of humic acid on TiO2/activated carbon composites. In: Journal of Hazardous Materials. 2011 ; Vol. 186, No. 1. pp. 765-772.
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    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. {\circledC} 2010 Elsevier B.V.",
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