Journal
RSC ADVANCES
Volume 5, Issue 122, Pages 100898-100904Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra18601c
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Funding
- National Natural Science Foundation of China [51402218]
- Guangdong Natural Science foundation [2014A030313622, 2015A030306031]
- Science Foundation for Young Teachers of Wuyi University [2013zk05, 2014td01]
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In this study, the surface interactions between different dyes and amorphous WO3 nanosheets in water were investigated. The amorphous WO3 nanosheets had a strong adsorption for cationic dyes and could be self-precipitated from water after enough dye molecules were absorbed into their micro-structures. The absorbed cationic dyes eventually formed H-aggregates or J-aggregates on the surface of WO3. In contrast, the amorphous WO3 nanosheets had a weak or no adsorption capacity for anionic dyes. This selective adsorption property of WO3 nanosheets could be applied to separate cationic dyes from a mixed solution. The possibilities of pH-induced desorption for cationic dyes on the WO3 nanosheet surfaces have also been demonstrated in this study, and its mechanism has been discussed in detail. The findings leaded to a better understanding of the dye adsorption behavior on amorphous tungsten oxide surfaces.
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