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Utilization of aluminum hydroxide waste generated in fluoride adsorption and coagulation processes for adsorptive removal of cadmium ion |
Jiawei JU1,2,Ruiping LIU1,*(),Zan HE1,2,Huijuan LIU1,Xiwang ZHANG3,Jiuhui QU1 |
1. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 2. University of Chinese Academy of Sciences, Beijing 100039, China 3. Department of Chemical Engineering, Monash University, Clayton VIC 3800, Australia |
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Abstract Although Al-based coagulation and adsorption processes have been proved highly efficient for fluoride (F) removal, the two processes both generate large amount of Al(OH)3 solid waste containing F (Al(OH)3-F). This study aimed to investigate the feasibility of utilizing Al(OH)3-F generated in Al(OH)3 adsorption (Al(OH)3-Fads) and coagulation (Al(OH)3-Fcoag) for the adsorption of cadmium ion (Cd(II)). The adsorption capacity of Al(OH)3-Fads and Al(OH)3-Fcoag for Cd(II) was similar as that of pristine aluminum hydroxide (Al(OH)3), being of 24.39 and 19.90 mg·g-1, respectively. The adsorption of Cd(II) onto Al(OH)3-Fads and Al(OH)3-Fcoag was identified to be dominated by ion-exchange with sodium ion (Na+) or hydrogen ion (H+), surface microprecitation, and electrostatic attraction. The maximum concentration of the leached fluoride from Al(OH)3-Fads and Al(OH)3-Fcoag is below the Chinese Class-I Industrial Wastewater Discharge Standard for fluoride (<10 mg·L-1). This study demonstrates that the Al(OH)3 solid wastes generated in fluoride removal process could be potentially utilized as a adsorbent for Cd(II) removal.
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Keywords
Al(OH)3
fluoride
cadmium
adsorption
reclamation
sequential extraction
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Corresponding Author(s):
Ruiping LIU
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Online First Date: 28 July 2015
Issue Date: 05 April 2016
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