Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 35, Pages 19726-19735Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b05263
Keywords
titanate nanotubes; Fe-deposited; photocatalytic activity; dual-enhanced; visible light; As
Funding
- National Natural Science Foundation of China [51379010]
- U.S. Department of the Interior Bureau of Ocean Energy Management [M12AC00013]
- Collaborative Innovation Center for Regional Environmental Quality of China
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Fe-deposited titanate nanotubes (Fe-TNTs) with high photocatalytic activity and adsorptive performance were synthesized through a one-step hydrothermal method. Initial As(III) oxidation followed by As(V) adsorption by Fe-TNTs could simultaneously remove these two toxic pollutants from aqueous solutions. The apparent rate constant value for photo-oxidation of As(III) under UV irradiation by Fe-TNTs was almost 250 times that of unmoidified TNTs. Under visible light, the Fe-TNTs also exhibited enhanced photocatalytic activity after Fe was deposited. Fe' located in the interlayers of TNTs acted as temporary electron- or hole-trapping sites, and attached alpha-Fe2O3 played the role of a charge carrier for electrons transferred from TNTs. These two effects inhibited electron hole pair recombination thus promoting photocatalysis. Moreover, the As(V) adsorptive performance of Fe-TNTs also improved, owing to the presence of additional adsorption sites, a-Fe2O3, as well as increased pHpzo Furthermore, Fe-TNTs exhibited good photocatalytic and adsorptive performace even after 5 reuse cycles. The present tests, concerning an initial As(III) photocatalysis and subsequent As(V) adsorption process, highlight the feasibility and importance of Fe used to modify TNTs. This study proposes a feasible method to simultaneously remove As(III) and As(V) from contaminated water using a novel Ti-based nanomaterial.
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