Wang, Lingzhi, Cheng, Chen, Sen, Tapas, Lei, Juying, Matsuoka, Masaya, Zhang, Jinlong and Zhang, Fan (2015) Carbon dots modified mesoporous organosilica as an adsorbent for the removal of 2,4-dichlorophenol and heavy metal ions. Journal of Materials Chemistry A, 3 (25). pp. 13357-13364. ISSN 2050-7488
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Official URL: http://dx.doi.org/10.1039/C5TA01652E
Periodic mesoporous organosilica embedded with carbon dots are adopted as the adsorbent for removal of the toxic organic pollutant 2,4-dichlorophenol and inorganic metal ions Hg(II), Cu(II), and Pb(II). The composite possesses an ordered 2D hexagonal mesostructure with a space group of p6mm, high specific surface area ([similar]468.46 m2 g−1), and uniform pore size ([similar]5.50 nm). The surface is covered by about 1–2 layers of carbon dot nanoparticles. The maximum adsorption capacity for 2,4-dichlorophenol is 99.70 mg g−1, and the distribution coefficient of metal ions between adsorbent and solution phases is in the range of 2.60–7.41, following the order of Hg(II) > Cu(II) > Pb(II). The Cu(II) and Pb(II) adsorption stays nearly fixed while Hg(II) adsorption is depressed by [similar]45% in a mixed solution of metal ions. The Cu(II) and Hg(II) adsorption shows unapparent variation but Pb(II) adsorption is improved by [similar]55% in a mixed solution of metal ion and 2,4-dichlorophenol. In contrast, all metal ions lead to the depression of 2,4-dichlorophenol adsorption by 37% (Pb(II)), 45% (Cu(II)), and 48% (Hg(II)). Finally, the n–π electron donor–acceptor interaction between O- and N-containing groups in mesoporous organosilica and the benzene ring in 2,4-dichlorophenol is revealed to be responsible for the enhanced adsorption of 2,4-dichlorophenol, while the electrostatic force and complex formation between metal ions and amide groups co-contribute to the improvement of metal ions adsorption.
|Additional Information:||This work has been supported by the National Nature Science Foundation of China (U1407102, 21322508, 21210004, 21173077 and 21377038), the National Basic Research Program of China (973 Program, 2013CB632403, 2013CB934100, 2012CB224805), the Science and Technology Commission of Shanghai Municipality (14ZR1410700 and 14230710500), the Research Fund for the Doctoral Program of Higher Education (20120074130001), the Program for New Century Excellent Talents in University (NCET) and the Fundamental Research Funds for the Central Universities.|
|Subjects:||Physical sciences > Chemistry|
|Schools:||Faculty of Science and Technology > School of Physical Sciences and Computing|
|Deposited By:||Paul Harrison|
|Deposited On:||08 Sep 2015 10:00|
|Last Modified:||20 Oct 2016 15:49|
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