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Utilization of aluminum hydroxide waste generated in fluoride adsorption and coagulation processes for adsorptive removal of cadmium ion
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 IndustrialWastewater 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.
Utilization of aluminum hydroxide waste generated in fluoride adsorption and coagulation processes for adsorptive removal of cadmium ion
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 IndustrialWastewater 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.
Utilization of aluminum hydroxide waste generated in fluoride adsorption and coagulation processes for adsorptive removal of cadmium ion
Ju, Jiawei (author) / Liu, Ruiping (author) / He, Zan (author) / Liu, Huijuan (author) / Zhang, Xiwang (author) / Qu, Jiuhui (author)
Frontiers of Environmental Science & Engineering ; 10 ; 467-476
2015-07-27
10 pages
Article (Journal)
Electronic Resource
English
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