Adsorption of from Aqueous Solution by Functionalized Coal Particles with Dithiocarbamate
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 22, Issue 4
Abstract
Shenfu coal particles with a mean diameter of were modified to contain functional surface groups by chemically grafting dithiocarbamate (DTC) onto the coal particles using -aminopropyltriethoxysilane as a coupler. The properties of adsorption using the functionalized coal particles were studied using batch experiments and compared with adsorption using the original coal particles. The mechanisms of coal particle modification and adsorption are discussed. Results show that the process of adsorption onto the functionalized coal particles follows pseudo-second-order kinetics. The adsorption isotherm of on functionalized coal particles can be described by the Langmuir model. The amount of saturated monomolecular layer adsorption () onto the functionalized coal particles for was found to be , which is much higher than that found for the original coal particles. The related thermodynamic parameters, and of adsorption onto functionalized coal particles were negative, indicating that the process is exothermic and spontaneous. The Fourier transform infrared spectroscopy (FTIR) spectrum analysis illustrated that the DTC grafted onto the surface of the coal particles and successfully reacted with from the aqueous solution. The specific surface area analysis showed that the specific surface area of functionalized coal particles was , which was much higher than that of original coal particles (). The scanning electron microscopy (SEM) analysis showed that the surfaces of functionalized coal particles were rougher than original coal particles. The paper concludes that functionalized coal with chelating groups is an efficient way to improve the adsorption capacity of coal used for removing heavy metal ions from aqueous solutions.
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Acknowledgments
This work was supported by the National Natural Science Foundation (51278418) of PR China, the Industrial Research Project of Shaanxi Province and Science and Technology (2013K11-10), the Project of Yulin City and Shaanxi Province, and the Special Fund for Basic Scientific Research of Central Colleges, Chang’an University (310829151144). The authors thank Dr. Terry E. Baxter at Northern Arizona University in Flagstaff, Arizona, for his assistance with editing the manuscript.
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©2018 American Society of Civil Engineers.
History
Received: Dec 10, 2017
Accepted: Apr 10, 2018
Published online: Jul 25, 2018
Published in print: Oct 1, 2018
Discussion open until: Dec 25, 2018
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