Carbon dots modified mesoporous organosilica as an adsorbent for the removal of 2,4-dichlorophenol and heavy metal ions
Journal of Materials Chemistry A, cilt.3, sa.25, ss.13357-13364, 2015 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 3 Sayı: 25
- Basım Tarihi: 2015
- Doi Numarası: 10.1039/c5ta01652e
- Dergi Adı: Journal of Materials Chemistry A
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.13357-13364
- Atatürk Üniversitesi Adresli: Hayır
Özet
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 (∼468.46 m2 g-1), and uniform pore size (∼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 ∼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 ∼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. This journal is