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《Acta Materiae Compositae Sinica》 2018-06
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Preparation and characterization of calcium alginate@Fe_3O_4/biochar magnetic microsphere and its adsorption characteristics and mechanism for Co(Ⅱ)

YU Changjiang;WANG Miao;DONG Xinyu;LIN Qiang;Faculty of Environmental Science and Engineering,Kunming University of Science and Technology;Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province,College of Chemistry and Chemical Engineering,Hainan Normal University;  
A magnetic microspheres(Calcium Alginate@Fe_3O_4/Biochar)was prepared using calcium alginate(CA)encapsulated biochar(BC)and Fe_3O_4 as the green adsorbent for Co(Ⅱ)removal from aqueous solution.The effects of the initial Co(NO3)2 concentration,initial pH value of Co(Ⅱ)solution and equilibrium contact time were investigated on CA@Fe_3O_4/BC.The isothermal thermodynamic datas of the CA@Fe_3O_4/BC conformed to the Langmuir model.The maximum adsorption capacity of the CA@Fe_3O_4/BC from the Langmuir equation is 16.23 mg·g-1 at pH=6.It appears a synergistic effect between biochar and Fe_3O_4 in CA,which enhances the maximum adsorption capacity of Co(Ⅱ)ion.The presence of the magnetic particles in magnetic microsphere allows easy isolation of the material from aqueous solutions by using a magnet.The adsorptions of Co(Ⅱ)by the CA@Fe_3O_4/BC are in good agreement with pseudo-second-order kinetic.The mechanism studies for Co(Ⅱ)removal by the CA@Fe_3O_4/BC show that the nature of Co(Ⅱ)abstraction takes place through the ion exchange between Ca(Ⅱ)and Co(Ⅱ)as well as the formation of coordination complex.
【Fund】: 海南省重点研发计划项目(ZDYF2017102);; 海南省自然科学基金(20162032);; 海南省精细化工工程技术研究中心开放课题;; 海南师范大学2017年度“大学生创新创业训练计划”项目
【CateGory Index】: TB33;TQ424
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