摘要
采用共沉淀法和包裹法分别制备了新型Fe-Mn磁改性硅藻土基吸附剂FMDⅠ和FMDⅡ,利用X射线衍射仪(XRD)和氮气吸附脱附对其结构和表面形貌进行了表征,并采用振动样品磁强计(VSM)测得FMDⅠ和FMDⅡ的饱和磁化强度分别达14.15 emu/g和35.20 emu/g。以硝酸铅溶液为目标污染物,考察了pH、吸附剂投加量对Pb^(2+)的吸附效果的影响,并对其吸附动力学和吸附等温线进行了探讨。结果表明,当吸附剂投加量为1 g/L,pH为6时,FMDⅠ对Pb^(2+)的吸附饱和量达29.837 mg/g,Pb^(2+)的去除率为43.50%;FMDⅡ对Pb^(2+)的吸附饱和量达60.475 mg/g,为硅藻土原土的4.42倍,对Pb^(2+)的去除率为91.86%。吸附动力学拟合结果表明该过程符合拟二级动力学模型,属于多位点的非单分子层吸附过程。
Fe-Mn Magnetically modified diatomite based adsorbents FMDⅠand FMDⅡwere prepared by co-precipitation method and wrapping method,respectively.The structure and surface morphology of Fe-Mn magnetically modified diatomite based adsorbents FMDⅠand FMDⅡwere characterized by X-ray diffraction(XRD)and nitrogen adsorption desorption.The saturation magnetization of FMDⅠand FMDⅡwas 14.15 emu/g and 35.20 emu/g,respectively,measured by VSM.Taking lead nitrate solution as the target pollutant,the influence of pH and the amount of adsorbent on the adsorption of Pb^(2+) was investigated,and its adsorption kinetics and adsorption isotherm were discussed.The results show that:when the dosage of adsorbent is 1 g/L and pH is 6,the adsorption saturation of Pb^(2+) on FMDⅠand FMDⅡreaches 29.837 mg/g and 60.475 mg/g,4.42 times of that on diatomite.The removal rate of Pb^(2+) on FMDⅠis 43.50%,the removal rate of Pb^(2+) by FMDⅡis 91.86%.The results of adsorption kinetics fit the pseudo-second-order adsorption kinetics model,and the adsorption process belongs to multi-site non-monomolecular layer.
作者
王诗雯
李溪
张潇
许宝康
于鹏
韩锋
WANG Shi-wen;LI Xi;ZHANG Xiao;XU Bao-kang;YU Peng;HAN Feng(School of Environmental Science and Engineering,Nanjing Tech University,Nanjing 211816,China;Chongqing Changan New Energy Technology Co.,Chongqing 404100,China)
出处
《应用化工》
CAS
CSCD
北大核心
2022年第9期2537-2542,共6页
Applied Chemical Industry
基金
国家重点研发计划项目(2017YFB0602500)
国家自然科学基金青年基金项目(21607074)
江苏省自然科学基金资助项目(BK20201362)
江苏省六大人才高峰项目(JNHB-038)。
