Citation: Ting Yang, Yi-Kun Li, Ming-Li Chen, Jian-Hua Wang. Supported carbon dots decorated with metallothionein for selective cadmium adsorption and removal[J]. Chinese Chemical Letters, ;2015, 26(12): 1496-1501. doi: 10.1016/j.cclet.2015.10.018 shu

Supported carbon dots decorated with metallothionein for selective cadmium adsorption and removal

1.
Research Center for Analytical Sciences, College of Sciences, Northeastern University, Box 332, Shenyang 110819, China

Corresponding author: Ming-Li Chen, Jian-Hua Wang,
Received Date: 29 July 2015
Available Online: 27 October 2015

Carbon dots are prepared and immobilized onto spherical SiO₂ through a one-step thermal oxidation and then decorated with metallothionein (MT), a protein with high affinity towards thiophilic metals. The MT-carbon dots composites are characterized by means of FT-IR, SEM and TGA, giving rise to a MT loading amount of 823 μg g^-1. The adsorption of cadmium by the composites is a fast process and follows Langmuir model. In comparison with native SiO₂, a 2- and 2.4-folds improvement on the static and dynamic adsorption capacity of the composites for cadmium are obtained, respectively. Moreover, the adsorption efficiency is not affected by the presence of other metals. Finally, the composites are successfully applied for the removal of cadmium in a series of environmental water samples.
- Carbon dots
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沈阳化工大学材料科学与工程学院沈阳 110142