吸附
木质素
吸附剂
纤维素
材料科学
解吸
化学工程
聚合物
共聚物
水溶液中的金属离子
有机化学
化学
金属
复合材料
工程类
冶金
作者
Yuanyuan Ge,Qin Li,Zhili Li
标识
DOI:10.1016/j.matdes.2016.01.102
摘要
An increased interest in development of natural polymer-based sorbent for cleanup of heavy metals in water has been seen due to their abundance, low-in cost, and eco-friendliness. Lignin, the second most abundant natural polymer next to cellulose, however, is much limited by low response rate and low adsorption capability to heavy metals. Here, we show a new type of lignin microspheres (LMS) prepared by an inverse suspension copolymerization method for effective removal of Pb(II) in water. The prepared LMS was in diameter of 348 μm with a large surface area of 9.6 m2/g, 5.3 times of lignin, and contained abundant amine functional groups (total N: 7.5 mmol/g). LMS showed a fast response rate and a high adsorption capacity to Pb(II) (33.9 mg/g), 137% and 280% larger than alkaline lignin and poplar lignin, respectively. The adsorption process was endothermic and spontaneous in nature. Moreover, the lead-loading LMS could be easily regenerated with a high adsorption stability, after five adsorption–desorption cycles, the adsorption capacity only decreased by 12.5%. The proposed LMS is eco-friendly, cost-effective and therefore a promising candidate for Pb(II) retention with effective adsorption and reusable abilities.
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