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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-$ F_{ads} $) and coagulation (Al(OH)3-$ F_{coag} $) for the adsorption of cadmium ion (Cd(II)). The adsorption capacity of Al(OH)3-$ F_{ads} $ and Al(OH)3-$ F_{coag} $ for Cd(II) was similar as that of pristine aluminum hydroxide (Al(OH)3), being of 24.39 and 19.90 mg·$ g^{–1} $, respectively. The adsorption of Cd(II) onto Al(OH)3-$ F_{ads} $ and Al(OH)3-$ F_{coag} $ was identified to be dominated by ion-exchange with sodium ion ($ Na^{+} $) or hydrogen ion ($ H^{+} $), surface microprecitation, and electrostatic attraction. The maximum concentration of the leached fluoride from Al(OH)3-$ F_{ads} $ and Al(OH)3-$ F_{coag} $ is below the Chinese Class-I IndustrialWastewater Discharge Standard for fluoride (<10 mg·$ L^{–1} $). This study demonstrates that the Al(OH)3 solid wastes generated in fluoride removal process could be potentially utilized as a adsorbent for Cd(II) removal.
Utilization of aluminum hydroxide waste generated in fluoride adsorption and coagulation processes for adsorptive removal of cadmium ion
Abstract Although Al-based coagulation and adsorption processes have been proved highly efficient for fluoride (F) removal, the two processes both generate large amount of Al(OH)3 solid waste containing F (Al(OH)3-F). This study aimed to investigate the feasibility of utilizing Al(OH)3-F generated in Al(OH)3 adsorption (Al(OH)3-$ F_{ads} $) and coagulation (Al(OH)3-$ F_{coag} $) for the adsorption of cadmium ion (Cd(II)). The adsorption capacity of Al(OH)3-$ F_{ads} $ and Al(OH)3-$ F_{coag} $ for Cd(II) was similar as that of pristine aluminum hydroxide (Al(OH)3), being of 24.39 and 19.90 mg·$ g^{–1} $, respectively. The adsorption of Cd(II) onto Al(OH)3-$ F_{ads} $ and Al(OH)3-$ F_{coag} $ was identified to be dominated by ion-exchange with sodium ion ($ Na^{+} $) or hydrogen ion ($ H^{+} $), surface microprecitation, and electrostatic attraction. The maximum concentration of the leached fluoride from Al(OH)3-$ F_{ads} $ and Al(OH)3-$ F_{coag} $ 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)
2015
Article (Journal)
English
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