Graft copolymerization of epichlorohydrin and ethylenediamine onto cellulose derived from agricultural by-products for adsorption of Pb(II) in aqueous solution
Graft copolymerization of epichlorohydrin and ethylenediamine onto cellulose derived from agricultural by-products for adsorption of Pb(II) in aqueous solution
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环氧氯丙烷和乙二胺接枝共聚于农副产品纤维素上吸附水溶液中的 Pb(II)
DOI：
10.1007/s10570-014-0246-y
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发表时间：
2014-06-01
期刊：
影响因子：
5.7
通讯作者：
Zhang, Yufeng
中科院分区：
文献类型：
--
作者：
Ding, Zhuhong;Yu, Rui;Zhang, Yufeng
为了开发低成本、高效吸收剂，利用17.5% NaOH从花生壳、大豆壳和柚子皮中提取纤维素，然后与环氧氯丙烷和乙二胺共聚。红外光谱和N含量表明纤维素与乙二胺成功共聚。研究了影响Pb(II)吸附行为的因素，如pH、温度、固液比、各种金属离子的竞争吸附、初始金属浓度和吸附时间。 120 min内即可达到吸附平衡，吸附动力学过程符合准二级动力学模型。等温吸附数据与Langmuir吸附模型吻合较好，改性花生壳、大豆壳和柚子皮的最大吸附量分别为47.8、101和232 mg·g(-1)。混合金属离子的竞争吸附表明，改性花生壳、大豆壳和柚子皮优先从溶液中去除 Pb(II)，然后是 Cu(II) 和 Cr(III)。在 1 mol·L-1 HCl 溶液中，改性花生壳、大豆壳和柚子皮中的 Pb(II) 得到有效解吸。乙二胺改性柚子皮比乙二胺改性大豆壳和花生壳表现出更高的吸收性能，可作为潜在的低成本高效吸收剂去除废水中的铅离子。
In order to develop a low-cost and high efficient absorbent, cellulose was extracted from peanut hulls, soybean shells and grapefruit peels using 17.5 % NaOH and then copolymerized with epichlorohydrin and ethylenediamine. Infrared spectra and N contents show that the cellulose was copolymerized successfully with the ethylenediamine. Factors affecting the adsorption behavior of Pb(II), such as pH, temperature, ratio of solid to liquid, competitive sorption of various metal ions, initial metal concentration and adsorption time, were then investigated. The adsorption equilibrium could be obtained within 120 min and the kinetic adsorption processes fitted well with the pseudo-second order kinetic model. The isotherm adsorption data fitted well with Langmuir adsorption model and the maximum absorption capacities of the modified peanut hulls, soybean shells and grapefruit peels were 47.8, 101 and 232 mg g(-1), respectively. The competitive adsorption of mixed metal ions demonstrated that Pb(II) was preferentially removed from solution by the modified peanuts shells, soybean shells and grapefruit peels, then Cu(II) and Cr(III). Desorption of Pb(II) from modified peanut hulls, soybean shells and grapefruit peels was effectively achieved in a 1 mol L-1 HCl solution. Ethylenediamine-modified grapefruit peels exhibited higher absorption performance than the ethylenediamine-modified soybean shells and peanut hulls and can be used as potential low-cost and high efficient absorbents for the removal of lead ions from wastewater.