Adsorption of lead ions using a modified lignin hydrogel
Adsorption of lead ions using a modified lignin hydrogel
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使用改性木质素水凝胶吸附铅离子
DOI：
10.1007/s10965-014-0465-9
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发表时间：
2014-05
影响因子：
2.8
通讯作者：
Ding Chu
中科院分区：
文献类型：
--
作者：
Yao Qingxin;Xie Jianjun;Liu Junxia;Ding Chu
合成了膨润土/木质素磺酸钠(BLPAMA)/丙烯酰胺/马来酸酐(BLPAMA)接枝共聚物(BLPAMA)复合吸附材料，对其进行了表征，并将其用于去除水中的Pb2+。研究了吸附剂用量、初始pH、接触时间、温度、Pb2+浓度和添加剂电解液对BLPAMA的基本吸附行为。结果表明，BLPAMA对Pb2+的吸附不受温度的影响，但对pH有很强的依赖性。Pb2+的吸附动力学符合准二级模型，吸附等温线符合Langmuir模型，为单分子层化学吸附。热力学参数，如吉布斯自由能、热焓和熵变也被计算出来。结果表明，BLPAMA对Pb2+的吸附是自发的、吸热的。研究了Pb2+、Cu2+、Cd2+和Zn2+在其四元金属溶液中的竞争吸附，结果表明BLPAMA对Pb2+有较好的吸附作用。热重分析和扫描电子显微镜表征证实了Pb2+在BLPAMA上的吸附。FTIR和XPS分析进一步表明，BLPAMA对Pb2+的吸附机理主要是络合和离子交换机理。
Adsorbent composites comprising of bentonite/sodium lignosulfonate graft-polymerized with acrylamide and maleic anhydride (BLPAMA) were synthesized, characterized, and used to remove Pb2+from aqueous solution with a large adsorption capacity. The fundamental adsorption behavior of the as-prepared BLPAMA was studied as a function of adsorbent dosage, initial pH, contact time, temperature, concentration of Pb2+, and additive electrolyte. Results showed that the adsorption of Pb2+on BLPAMA was temperature-independent but strongly pH dependent. The Pb2+adsorption kinetics was well described by a pseudo-second order model and the adsorption isotherms closely adhered to the Langmuir model, indicating a monolayer chemical adsorption. Thermodynamic parameters such as Gibbs free energy, enthalpy, and entropy changes were also evaluated. Their values demonstrated that the adsorption of Pb2+on BLPAMA was spontaneous and endothermic in nature. The competitive adsorption of Pb2+, Cu2+, Cd2+and Zn2+in their quaternary metal solution was investigated and the results showed that Pb2+was preferably adsorbed on BLPAMA. TGA and SEM characterization proved that Pb2+was adsorbed onto BLPAMA. FTIR and XPS analyses further revealed that the adsorption mechanism of Pb2+on BLPAMA were mainly through chelation and ion exchange mechanism.
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影响因子：
11.4
作者：
K. A. Matis;A. Zouboulis;I. Hancock
通讯作者：
K. A. Matis;A. Zouboulis;I. Hancock
影响因子：
4.7
作者：
Kravchenko, Tamara A.;Polyanskiy, Leo L.;Hoell, Wolfgang H.
通讯作者：
Hoell, Wolfgang H.
影响因子：
2.8
作者：
Wenbo Wang;Yuru Kang;Aiqin Wang
通讯作者：
Wenbo Wang;Yuru Kang;Aiqin Wang
影响因子：
0.7
作者：
N. N. Chopabaeva-N.;E. Ergozhin;A. T. Tasmagambet;A. I. Nikitina
通讯作者：
N. N. Chopabaeva-N.;E. Ergozhin;A. T. Tasmagambet;A. I. Nikitina
DOI：
--
发表时间：
2012
期刊：
Journal of Shandong University
影响因子：
--
作者：
Wang Yan
通讯作者：
Wang Yan