Cited by 215TiO2 Photocatalysis and Solar CellsAdvanced oxidation water treatmentAdsorption and biosorption for pollutant removal

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·2011·Journal of Hazardous Materials

Abstract

A photocatalyst comprising nano-sized TiO(2) particles on granular activated carbon (GAC) was prepared by a sol-dipping-gel process. The TiO(2)/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 TiO(2) immobilization. A 99.5% removal efficiency for HA from solution was achieved at an initial concentration of 15 mg/L in a period of 3h. It was found that degradation of HA on the TiO(2)/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.

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Crossref · 10.1016/j.jhazmat.2010.11.063

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  • •OH may attack aromatic ring sites in compounds, resulting in ring-opened products yielding CO2/H2O and other degradation products; breakdown of the benzene ring and subsequent mineralization to CO2 and H2O could be envisaged by the decrease in TOC during the photocatalytic process.

    “Additionally, • OH may attack aromatic ring sites in compounds resulting in the formation of ring-opened (Fig. 13) products yielding CO 2 /H 2 O and other degradation products; 136,137 breakdown of the benzene ring and its subsequent mineralization leading to CO 2 and H 2 O could be envisaged by the decrease in TOC during the photocatalytic process.138”

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Authors
Xue, G., Liu, H., Chen, Q., Hills, C., Tyrer, M., & Innocent, F.
Affiliations
  • Donghua University (CN)
  • University of Greenwich (GB)
  • University College London (GB)
Corresponding author
Chen, Quanyuan
Venue
Journal of Hazardous Materials
Publisher
Elsevier BV
Published
2011-02
Volume
186
Issue
1
Pages
765-772
ISSN
0304-3894 (ISSN-L)
OpenAlex
W1978900623
Cited by
215
References
44
Citations by year
2026: 8 · 2025: 10 · 2024: 13 · 2023: 11 · 2022: 14 · 2021: 19 · 2020: 17 · 2019: 17 · 2018: 15 · 2017: 12 · 2016: 21 · 2015: 12 · 2014: 13 · 2013: 14 · 2012: 12
FWCI
4.94
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Hazardous Materials (publishedVersion)
  • PubMed (publishedVersion)
  • Greenwich Academic Literature Archive (University of Greenwich) (submittedVersion)
  • Pure (Coventry University) (submittedVersion)
Funders
  • Shanghai Leading Academic Discipline Project (B604)
  • Natural Science Foundation of China (50874031)
  • Program for New Century Excellent Talents in Universities (NECT-07-0175)
  • Shanghai Key Basic Research Project (08JC1400500)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
  • Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
Keywords
humic acid degradation, TiO2/activated carbon composite, photocatalysis, surface adsorption, adsorption-photocatalysis synergy, Langmuir-Hinshelwood mechanism, TiO2 immobilization, adsorption constants, water treatment
MeSH terms
Adsorption, Carbon, Catalysis, Humic Substances, Hydrogen-Ion Concentration, Microscopy, Electron, Scanning, Photochemistry, Surface Properties, Temperature, Titanium, Metal Nanoparticles

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