以固体废弃生物质木薯渣为原料,首先采用乙二胺和二硫化碳对其进行化学改性,然后反相乳液-交联聚合制备化学改性木薯渣磁性微球吸附剂。考察了Pb(Ⅱ)的初始浓度、吸附剂含量、吸附时间、pH和吸附温度对Pb(Ⅱ)的吸附规律及动力学行为;并通过扫描电镜和红外光谱对其进行表征。结果表明,木薯渣被乙二胺和二硫化碳成功改性;黄原酸酯木薯渣磁性微球(SCRM)的分散性和球形度好。在本实验考察范围内,SCRM对Pb(Ⅱ)吸附量可达304mg/g;动力学研究显示吸附过程符合Langmuir等温吸附模型和拟二级动力学模型,吸附过程是一个受化学吸附机理控制的过程。
The magnetic microspheres of cassava residue were prepared by inverse emulsion method used cassava residue modified by ethylenediamine and carbon disulfide as raw materials.The effect of Pb(Ⅱ) initial concentration,adsorbent dosage,adsorption time,pH and adsorption reaction temperature on the Pb(Ⅱ) adsorption property of microspheres was studied.And the magnetic microspheres of cassava residue and cassava residue were characterized by SEM and FT-IR,respectively.The results shown that xanthate cassava residue was synthesized successfully,and the magnetic microspheres of xanthate cassava residue had good dispersity and sphericity,the adsorption effect of Pb(Ⅱ) was obviously improved.and the adsorption capacity can reach 304mg/g.The adsorption process fitted to a pseudo-second-order kinetics and Langmuir isothermal adsorption model and the adsorption process was a process controlled by the chemical adsorption mechanism.
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基金资助
国家自然科学基金(21766001);广西自然科学基金项目(2018GXNSFAA281342);广西石化资源加工及过程强化技术重点实验室主任课题基金资助(2018Z009);广西教育厅科研基金重点项目(KY2015ZD005)
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