Adsorpting Pb2+ and Zn2+ from Acid Mine Drainage by Coffee Grounds

doi:10.3969/j.issn.0253-374x.2014.09.010

Home > Archive>Volume 42, Issue 9, 2014 >1365-1371. DOI:10.3969/j.issn.0253-374x.2014.09.010

Adsorpting Pb2+ and Zn2+ from Acid Mine Drainage by Coffee Grounds
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                        10.3969/j.issn.0253-374x.2014.09.010
                    
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Affiliation:School of Civil and Environment Engineering, University of Science and Technology Beijing,School of Civil and Environment Engineering, University of Science and Technology Beijing,School of Civil and Environment Engineering, University of Science and Technology Beijing,chool of Civil and Environment Engineering, University of Science and Technology Beijing,School of Civil and Environment Engineering, University of Science and Technology Beijing,School of Civil and Environment Engineering, University of Science and Technology Beijing
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Scanning electron microscope, infrared spectrum analyzer and Zeta potentiometer are used to explore the mechanism about the adsorption and the parameters effecton the adsorption rate of Pb2+ and Zn2+ by coffee grouds. Test results show that the maximum adsorption quantity appears when pH value is 4 and also 20 g·L-1 adsorbent is added into the aqueous solution. The maximum adsorption quantity of Pb2+ and Zn2+ by coffee grouds is 5.49 and 12.38 mg·g-1. The adsorption process reaches equilibrium after 4 hours. And the adsorption process accords with the second order kinetics model and Freundlich equation. The electronegativity of coffee grouds increase while pH value raises and it reduces after adsorpting Pb2+ and Zn2+. White particles appear on the surface of coffee grouds after the adsorption process. FT IR spectrum indicates that the main functional groups includes amide, ester and keto in the adsorption process.

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LIN Hai, ZHANG Xiaopei, DONG Yingbo, ZHENG Qianqian. Adsorpting Pb2+ and Zn2+ from Acid Mine Drainage by Coffee Grounds[J].同济大学学报(自然科学版),2014,42(9):1365~1371

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Received:November 13,2013
Revised:May 14,2014
Adopted:March 19,2014
Online: August 20,2014
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