Adsorption-photocatalytic degradation of Acid Red 88 by supported TiO₂: Effect of activated carbon support and aqueous anions

TiO₂ nanoparticles supported on activated carbons (TiO₂/AC) were synthesized for the synergistic removal of Acid Red 88 (AR) via photocatalytic degradation and adsorption. Great enhancement of photocatalytic efficiency was achieved by supporting TiO₂ on two ACs, Darco-G60 and Norit SA UF. The surfac...

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Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2011-07, Vol.171 (3), p.1098-1107
Main Authors: Gao, Bifen, Yap, Pow Seng, Lim, Tuti Mariana, Lim, Teik-Thye
Format: Article
Language:English
Subjects:
activated carbon
Adsorption
anions
Applied sciences
bicarbonates
Catalysis
Catalytic reactions
Chemical engineering
Chemistry
durability
Exact sciences and technology
General and physical chemistry
nanoparticles
nitrates
photolysis
Reactors
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:TiO₂ nanoparticles supported on activated carbons (TiO₂/AC) were synthesized for the synergistic removal of Acid Red 88 (AR) via photocatalytic degradation and adsorption. Great enhancement of photocatalytic efficiency was achieved by supporting TiO₂ on two ACs, Darco-G60 and Norit SA UF. The surface hydrophilic properties and pore size distribution of ACs have significant influences on TiO₂ deposition on the supports, resulting in remarkable different performances of the two TiO₂/AC composites in the degradation of AR. TiO₂ loaded on Norit SA UF (TiO₂/AC-N) had a more dispersed coverage on the AC support but lower AR adsorption capacity due to larger degree of pores blockage by the TiO₂ nanoparticles which were also shielded from incident UV. In comparison, TiO₂ loaded on Darco-G60 (TiO₂/AC-D) showed higher photocatalytic activity and better durability in cyclic reuse. The synergistic adsorption-photocatalysis was observed, and the optimal TiO₂-to-AC mass ratio was 80–20 for the highest photocatalytic activity. Inorganic anions exhibited varying impacts on the performance of TiO₂/AC. In general, the AC support could greatly abate TiO₂ deactivation by inorganic anions. Sulfate promoted the AR degradation over both TiO₂/AC-D and TiO₂/AC-N while chloride and nitrate exhibited no influence on TiO₂/AC-D but positive effect on TiO₂/AC-N. Phosphate and bicarbonate could deactivate the TiO₂/AC composites but to a less extent compared to their effects on the TiO₂ without AC support.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2011.05.006