引用本文:王志凯,张胜利,陈豪宇,姜曼,周祚万,等.磁性PEI功能化秸秆的制备及对Pb(Ⅱ)的吸附[J].环境科学研究,2017,30(8):1316-1324.
WANG Zhikai,ZHANG Shengli,CHEN Haoyu,JIANG Man,ZHOU Zuowan,et al.Preparation of Magnetic Polyethyleneimine Functionalized Rice Straw and Its Adsorption Properties for Pb(II) Ions[J].Reserrch of Environmental Science,2017,30(8):1316-1324.]
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 204次   下载 332 本文二维码信息
码上扫一扫!
分享到: 微信 更多
磁性PEI功能化秸秆的制备及对Pb(Ⅱ)的吸附
王志凯1, 张胜利1, 陈豪宇1, 姜 曼2, 周祚万2
1.西南交通大学地球科学与环境工程学院, 四川 成都 610031 ;2.西南交通大学材料科学与工程学院, 四川 成都 610031
摘要:
为获得同时具有优良的吸附性能和磁分离特性的生物吸附材料,以汽爆秸秆为基质,采用戊二醛交联剂法制备了磁性聚乙烯亚胺功能化秸秆吸附剂(Fe3O4-PEI-RS),通过SEM、XRD、FTIR、XPS和VSM等手段表征了材料的结构和性质,测定了Pb(Ⅱ)在Fe3O4-PEI-RS上的吸附性能,考察了pH、吸附时间、吸附剂投加量、Pb(Ⅱ)初始浓度、温度等因素对吸附的影响. 结果表明,Fe3O4-PEI-RS对Pb(Ⅱ)的吸附具有强烈的pH依赖性;吸附时间对Pb(Ⅱ)的吸附效率有明显的影响,在180 min时吸附达到平衡,吸附过程符合准二级动力学模型;Langmuir和Freundlich模型都能很好地描述Pb(Ⅱ)在Fe3O4-PEI-RS上的吸附行为,20、30和40 ℃时最大吸附量分别为192.31、200.00和212.77 mg/g;热力学参数ΔG<0,而焓变ΔH>0、ΔS>0,说明该吸附属于熵增加的自发吸热反应过程,升温有利于吸附. 重复试验表明,EDTA作解吸剂,经5次吸附/解吸附循环后吸附剂仍能保持较高的吸附容量. 研究显示,所制Fe3O4-PEI-RS对Pb(Ⅱ)具有较高的吸附容量,稳定性好、可循环利用,能在磁场下实现快速分离.
关键词:  聚乙烯亚胺  秸秆  磁性吸附剂  吸附  Pb(Ⅱ)
DOI:
分类号:
基金项目:四川省科技支撑项目(2015GZ0230,2016GZ0222)
Preparation of Magnetic Polyethyleneimine Functionalized Rice Straw and Its Adsorption Properties for Pb(II) Ions
WANG Zhikai1, ZHANG Shengli1, CHEN Haoyu1, JIANG Man2, ZHOU Zuowan2
1.School of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China ;2.School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Abstract:
Abstract: For combining magnetic separation with adsorption of polyethyleneimine (PEI) functionalized biosorbent, magnetic PEI modified rice straw (Fe3O4-PEI-RS) was successfully obtained. It was prepared by crosslinking PEI and rice straw with glutaraldehyde, while coating magnetic Fe3O4. The synthesized Fe3O4-PEI-RS was characterized by SEM, XRD, FT-IR, XPS and VSM. It′s adsorption potential for Pb(II) was evaluated. The influences of several operating parameters, such as pH, contact time, adsorbent dose, initial Pb(II) ion concentration and temperature of solution were investigated in batch mode. Results showed that the adsorption of Pb(II) on Fe3O4-PEI-RS was highly pH-dependent. Contact time had an obvious effect on the adsorption efficiency of Pb(II), and the adsorption equilibrium was reached after approximately 180 mins. The adsorption process followed pseudo-second-order reaction kinetics model. The equilibrium data fitted well with the Langmuir isotherm and Freundlich isotherm. The Langmuir maximum adsorption amounts were detected to be 192.3,0.00 and 212.77 mg/g at 20,0 and 40 ℃, respectively. The adsorption was a spontaneous and endothermic process according to the positive ΔH and ΔS, while negative ΔG, which can be promoted by increasing treating temperature. In addition, it was proven that the adsorbent retained good adsorption capacity after five adsorption/desorption cycles. In conclusion, the prepared Fe3O4-PEI-RS has a high adsorption capacity for Pb(II) pollutant, good stability and reusability. Furthermore, it is easily recovered from aqueous media by applying an external magnetic field.
Key words:  polyethyleneimine (PEI)  rice straw  magnetic adsorbent  adsorption  Pb(II)