粒状交联聚丙烯酸钠的制备及其对Pb2+的吸附性能  被引量:4

Preparation of Granular Crosslinked Sodium Polyacrylate and its Pb^(2+) Adsorption Performance

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作  者:毛淑华[1] 贺盛福 张帆[1] 彭清静[1] MAO Shu-hua;HE Sheng-fu;ZHANG Fan;PENG Qing-jing(College of Chemistry and Chemical Engineering, Hunan Provincial Engineering Laboratory of Integrated Control and Remediation of Heavy Metal Pollution from Mn-Zn Mining, Key Laboratory of Mineral Cleaner Production and Exploit of Green Functional Materials in Hunan Province, Jishou University, Jis)

机构地区:[1]吉首大学化学化工学院,锰锌矿业重金属污染综合防治技术湖南省工程实验室,矿物清洁生产与绿色功能材料开发湖南省重点实验室,湖南吉首416000

出  处:《高校化学工程学报》2017年第1期243-251,共9页Journal of Chemical Engineering of Chinese Universities

基  金:湖南省教育厅重点项目(15A150);矿物清洁生产与绿色功能材料开发湖南省重点实验室开放基金;湖南省高校科技创新团队支持计划;吉首大学2016年大学生研究性学习和创新性实验计划

摘  要:采用反相悬浮聚合法制备了粒状交联聚丙烯酸钠(gc-PAANa)凝胶,对gc-PAANa凝胶样品进行了SEM、FT-IR和TGA表征及溶胀率测试。将gc-PAANa凝胶用于吸附水溶液中Pb^(2+)的研究,结果表明,在p H=3.0~5.0 gc-PAANa凝胶对Pb^(2+)的吸附具有非常好的效果。0.02~0.1 mol×L-1 Ca2+/Mg2+的存在对Pb^(2+)的吸附几乎无影响,Pb^(2+)初始浓度对吸附结果影响较大,gc-PAANa凝胶对初始浓度低于350 mg×L-1的Pb^(2+)废水,Pb^(2+)的去除率可达到95%以上。gc-PAANa凝胶对Pb^(2+)的吸附动力学符合准二级模型,吸附等温线符合Langmuir模型,293 K下的最大吸附量为446.98 mg×g-1;吸附热力学分析表明,gc-PAANa凝胶对Pb^(2+)的吸附属于自发的放热反应。XPS分析表明,gc-PAANa凝胶吸附Pb^(2+)的机理属于-COO-与Pb^(2+)的螯合作用。吸附-解吸附循环实验显示,gc-PAANa凝胶处理含Pb^(2+)废水具有很好的重复利用性能。Granular crosslinked sodium polyacrylate (gc-PAANa) gel was prepared by reverse suspension polymerization and characterized by SEM, FT-IR and TGA, and its swelling ratio was also measured. Moreover,this gc-PAANa gel was used for Pb2+adsorption from aqueous solutions. The experimental results indicate that the gc-PAANa gel has excellent Pb2+ adsorption performance in the pH range of 3.0~5.0, and the presence of Ca2+ or Mg2+ (0.02~0.1 mol?L?1) has no obvious effect on the Pb2+ adsorption. More than 95% Pb2+ can beremoved from wastewater when the initial Pb2+ concentration is below 350 mg?L?1. The adsorption kinetics and isotherms of Pb2+ on gc-PAANa gel follow pseudo-second order model and Langmuir model, respectively. Themaximum Pb2+ adsorption capacity is 446.98 mg?g?1 at 293 K. The adsorption the rmodynamic analysis revealsthat Pb2+ adsorption on gc-PAANa gel is a spontaneous and exothermic process. Furthermore, adsorption mechanism analysis by XPS indicates that Pb2+ adsorption is mainly attributed to the chelation of -COO? with Pb2+. 5 cycles of adsorption-desorption results suggest that the gc-PAANa gel possesses good reusability for the treatment of Pb2+ wastewater.

关 键 词:反相悬浮聚合法 聚丙烯酸钠 凝胶 铅离子 吸附 

分 类 号:TQ[化学工程]

 

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