吸附
化学
刚果红
水溶液
Zeta电位
木质素
硅烷化
三乙氧基硅烷
胺化
环氧氯丙烷
朗缪尔
朗缪尔吸附模型
无机化学
有机化学
化学工程
纳米颗粒
催化作用
工程类
作者
Liangliang An,Chuanling Si,Jin Ho Bae,Hanseob Jeong,Yong Sik Kim
标识
DOI:10.1016/j.ijbiomac.2020.05.072
摘要
In this work, silanized and aminated lignin (SAL) was synthesized in one step and its adsorption of Congo red and Cu(II) ions in aqueous solution was explored. Lignin was subjected to amine-silanization with (3-aminopropyl) triethoxysilane (APTES). Structural characterization substantiated successful amine-silanzation of lignin and formation of multi-layer APTES intermolecular crosslinked structure. The prepared SAL (nitrogen content = 6.1%) exhibited enhanced molecular weight, thermal stability, and water- and organic solvent-resistance properties. Additionally, the present of the porous structure of particle surface and an increase in the specific surface area and zeta potential promoted the accessibility of contaminants to the effective adsorption sites of SAL. Adsorption experiments showed that both Congo red and Cu(II) ion could be completely removed at original pH value, and their adsorption involved electrostatic attraction and complexation, respectively. The adsorption isotherms and kinetics were well described by the Langmuir and pseudo-second-order equations, respectively. The results showed that SAL is a promising adsorbent for the treatment of effluents.
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