Novel polyethyleneimine functionalized chitosan–lignin composite sponge with nanowall-network structures for fast and efficient removal of Hg(II) ions from aqueous solution,Environmental Science: Nano

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Novel polyethyleneimine functionalized chitosan–lignin composite sponge with nanowall-network structures for fast and efficient removal of Hg(II) ions from aqueous solution
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020/01/08 , DOI: 10.1039/c9en01368g
Dan Zhang _{1,

2,

3,

4} , Lan Wang _{1,

2,

3,

4} , Hehua Zeng _{4,

5,

6,

7} , Baker Rhimi _{1,

2,

3,

4} , Chuanyi Wang _{1,

2,

3,

4,

8}

Affiliation

Adsorption of heavy metals by natural polymeric composites has attracted extensive attention due to their abundance, low cost, and eco-friendliness, but these composites tend to have low adsorption capacity, long response time and poor selectivity. Therefore, it is critically desired to develop an eco-friendly adsorbent that can remove heavy metal ions efficiently and quickly from aqueous solution. Here, a novel polyethyleneimine functionalized chitosan–lignin (PEI-CS-L) composite sponge adsorbent with nanowall-network structures is synthesized by cross-linking and lyophilization. Notably, the as-prepared adsorbent could remove Hg(II) ions selectively from an aqueous solution with high efficiency at a very quick response time, reaching >83.5% of the ultimate adsorption within just 1 min. This is attributed to the evenly interconnected porous structure of the composite sponge with nanoscale-wall structures which increase the distribution of functional groups, leading to the fast complexation of heavy metal ions with surface functional groups. It is worth noting that the PEI-CS-L sponge has excellent reusability, and its adsorption capacity only decreased by 4.09% after 5 cycles of adsorption and desorption. Considering its eco-friendliness, high efficiency and low cost, the developed PEI-CS-L sponge hold great promise in removing Hg(II) ions from wastewater.

中文翻译：

具有纳米壁网络结构的新型聚乙烯亚胺官能化壳聚糖-木质素复合海绵，可快速有效地去除水溶液中的Hg（II）离子

天然聚合物复合材料对重金属的吸附由于其含量丰富，成本低廉和生态友好性而引起了广泛的关注，但这些复合材料的吸附容量低，响应时间长且选择性差。因此，迫切需要开发一种可以从水溶液中快速有效地去除重金属离子的环保型吸附剂。在这里，通过交联和冻干合成了具有纳米壁网络结构的新型聚乙烯亚胺官能化壳聚糖-木质素（PEI-CS-L）复合海绵吸附剂。值得注意的是，所制备的吸附剂可以去除Hg（II）在非常短的响应时间内高效地从水溶液中选择性地分离出离子，在短短1分钟内达到最终吸附量的> 83.5％。这归因于复合海绵与纳米尺度壁结构的均匀互连的多孔结构，其增加了官能团的分布，从而导致重金属离子与表面官能团的快速络合。值得注意的是，PEI-CS-L海绵具有出色的可重复使用性，经过5次吸附和解吸循环后，其吸附能力仅下降了4.09％。考虑到其生态友好性，高效率和低成本，开发的PEI-CS-L海绵在去除废水中的Hg（II）离子方面具有广阔的前景。

更新日期：2020-03-21

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