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Open AccessArticle

Adsorption Behavior of Selective Recognition Functionalized Biochar to Cd(II) in Wastewater

by Shiqiu Zhang 1, Xue Yang 1, Le Liu 1,*, Meiting Ju 1,* and Kui Zheng 2
College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
Analytical and Testing Center, Southwest University of Science and Technology, Mianyang 621010, China
Authors to whom correspondence should be addressed.
Materials 2018, 11(2), 299;
Received: 9 January 2018 / Revised: 12 February 2018 / Accepted: 12 February 2018 / Published: 14 February 2018
(This article belongs to the Special Issue Element-Doped Functional Carbon-based Materials)
Biochar is an excellent absorbent for most heavy metal ions and organic pollutants with high specific surface area, strong aperture structure, high stability, higher cation exchange capacity and rich surface functional groups. To improve the selective adsorption capacity of biochar to designated heavy metal ions, biochar prepared by agricultural waste is modified via Ionic-Imprinted Technique. Fourier transform infrared (FT-IR) spectra analysis and X-ray photoelectron spectroscopy (XPS) analysis of imprinted biochar (IB) indicate that 3-Mercaptopropyltrimethoxysilane is grafted on biochar surface through Si–O–Si bonds. The results of adsorption experiments indicate that the suitable pH range is about 3.0–8.0, the dosage is 2.0 g·L−1, and the adsorption equilibrium is reached within 960 min. In addition, the data match pseudo-second-order kinetic model and Langmuir model well. The computation results of adsorption thermodynamics and stoichiometric displacement theory of adsorption (SDT-A) prove that the adsorption process is spontaneous and endothermic. Finally, IB possesses a higher selectivity adsorption to Cd(II) and a better reuse capacity. The functionalized biochar could solidify designated ions stably. View Full-Text
Keywords: biochar; targeted adsorption; Cd(II); adsorption biochar; targeted adsorption; Cd(II); adsorption
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MDPI and ACS Style

Zhang, S.; Yang, X.; Liu, L.; Ju, M.; Zheng, K. Adsorption Behavior of Selective Recognition Functionalized Biochar to Cd(II) in Wastewater. Materials 2018, 11, 299.

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