Formation of uniform colloidal spheres from lignin, a renewable resource recovered from pulping spent liquor
Formation of uniform colloidal spheres from lignin, a renewable resource recovered from pulping spent liquor
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由木质素形成均匀的胶体球，木质素是从制浆废液中回收的可再生资源
DOI：
10.1039/c3gc42131g
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发表时间：
2014-01-01
期刊：
影响因子：
9.8
通讯作者：
Yang, Dongjie
中科院分区：
文献类型：
--
作者：
Qian, Yong;Deng, Yonghong;Yang, Dongjie
以碱木质素为原料，采用乙酰化法对碱木质素进行化学改性，并将其作为生物质资源，通过自组装制备了均匀的胶体球。采用DLS、SLS、TEM、AFM、XPS、FTIR、元素分析和接触角等方法研究了乙酰化木质素（ACL）的自组装结构和胶体形成机理。结果表明，在ACL-THF溶液中不断加水，可诱导ACL分子逐渐疏水聚集，形成ACL胶体球。当ACL在THF中的初始浓度为1.0 mg mL-1时，ACL分子在临界水含量为44体积%时开始形成胶体球，并且在水含量为67体积%时完成胶凝过程。将过量的水加入到分散体中以“淬灭”所形成的结构，然后通过旋转蒸发处理ACL分散体以回收THF并获得胶体球。ACL胶体球具有110 nm的多分散性（μ2/μ 2）为0.022。每个胶体球中的平均聚集数（）和平均密度（）估计为1.0 × 105和0.187 g cm−3。水分散性纳米木质素的制备为制浆废液中木质素生物质的增值利用开辟了一条绿色有价值的途径，对可再生资源的利用和环境保护都具有重要意义。
Alkali lignin, recovered from the pulping black liquor, was chemically modified by acetylating, and then used as a biomass resource to prepare uniform colloidal spheres via self-assembly. The self-assembled structure and colloid formation mechanism of the acetylated lignin (ACL) were investigated by DLS, SLS, TEM, AFM, XPS, FTIR, elemental analysis and contact angle measurements. Results show that ACL colloidal spheres are obtained from gradual hydrophobic aggregation of ACL molecules, induced by continuously adding water into the ACL–THF solution. ACL molecules start to form colloidal spheres at a critical water content of 44 vol% when the initial concentration of ACL in THF is 1.0 mg mL−1, and the colloidization process is completed at a water content of 67 vol%. An excessive amount of water is added into the dispersions to “quench” the structures formed and then the ACL dispersion is treated by rotary evaporation for recycling THF and acquiring colloidal spheres. The ACL colloidal spheres have an of 110 nm with a polydispersity (μ2/Γ2) of 0.022. The average aggregated number ( ) in each colloidal sphere and the average density ( ) are estimated to be 1.0 × 105 and 0.187 g cm−3. Preparation of water-dispersive lignin nanoparticles opens up a green and valuable pathway for value-added utilization of lignin biomass recovered from pulping spent liquor, which is of great significance for both the utilization of renewable resources and environmental protection.