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作 者:崔云霞 韩剑宏[1] 王维大[1] 张连科[1] 李玉梅[1,2] 孙鹏[1,2] CUI Yun-xia;HAN Jian-hong;WANG Wei-da;ZHANG Lian-ke;LI Yu-mei;SUN Peng(School of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,China;School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
机构地区:[1]内蒙古科技大学能源与环境学院,包头014010 [2]华中科技大学环境科学与工程学院,武汉430074
出 处:《中国有色金属学报》2022年第1期236-250,共15页The Chinese Journal of Nonferrous Metals
基 金:内蒙古自治区自然科学基金资助项目(2016BS0511,2020MS02015,2019LH02006)。
摘 要:本文采用KHCO_(3)活化制备多孔活性炭(Porous activated carbon,PAC),然后用水热法制备磁性多孔活性炭/铁酸钙复合材料(PAC/CF),考察其对水溶液中钍(Ⅳ)的吸附特性,并通过扫描电镜、比表面积分析仪、X射线衍射、傅里叶变换红外光谱、振动样品磁强计和Zeta电位等手段对复合材料进行表征,验证其合成的可靠性及磁分离性能,揭示其吸附机制。结果表明:PAC与磁性铁酸钙(Calcium ferrite,CF)成功复合并能有效吸附废水中的钍(Ⅳ)。在pH=4.0、投加量为0.4 g/L、吸附时间为50 min的最佳条件下,PAC/CF对钍(Ⅳ)的吸附量可达129.8 mg/g。PAC/CF对钍(Ⅳ)的吸附动力学符合准二级模型,吸附等温线符合Langmuir模型,热力学参数表明吸附反应是自发吸热的。PAC/CF对钍(Ⅳ)的吸附机理为静电吸附、离子交换和配位反应,pH和离子强度对PAC/CF吸附钍(Ⅳ)的影响较为显著,PAC/CF可再生得以循环利用。In this study,KHCO_(3) was used as the activator to prepare porous activated carbon(PAC),then the magnetic porous activated carbon/calcium ferrite composite(PAC/CF)was prepared by hydrothermal method.The adsorption characteristics of PAC/CF on thorium(Ⅳ)in aqueous solution were investigated by scanning electron microscopy,specific surface area analyzer,X-ray diffraction,Fourier transform infrared spectroscopy,vibrating sample magnetometer and Zeta potential.And that verified the reliability and magnetic separation performance of the synthesized PAC/CF and revealed its adsorption mechanism.The results show that PAC and calcium ferrite(CF)are successfully combined and can effectively adsorb thorium(Ⅳ)in wastewater.The adsorption capacity of PAC/CF for thorium(Ⅳ)can reach 129.8 mg/g under the optimal conditions of pH=4.0,dosage of 0.4 g/L and adsorption time of 50 min.The adsorption kinetics of thorium(Ⅳ)by PAC/CF conforms to the quasi-second-order model,the adsorption isotherm conforms to the Langmuir model and the thermodynamic parameters indicate that the adsorption reaction is spontaneous endothermic.The adsorption mechanism of PAC/CF to thorium(Ⅳ)is electrostatic adsorption,ion exchange and coordination reaction.The effects of pH and ionic strength on the adsorption of thorium(Ⅳ)by PAC/CF are more significant,and PAC/CF can be regenerated and recycled.
关 键 词:多孔活性炭 铁酸钙 磁性复合材料 钍(IV) 吸附
分 类 号:TB33[一般工业技术—材料科学与工程]
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