School of Environmental & Resource Science, Shanxi University, Taiyuan 030006, China; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; Zhejiang Kan New Material Co., Ltd., Suichang 323300, China.
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
Int J Biol Macromol. 2024 Oct;277(Pt 2):134209. doi: 10.1016/j.ijbiomac.2024.134209. Epub 2024 Jul 26.
Herein, a series of lignin-based porous carbons (LC) were prepared from sulfonated lignin through a simple and environmentally-friendly one-pot activated carbonization together with various potassium compounds as activators, and used for malachite green (MG) adsorption. The results showed that the prepared biochar, especially after KCO activation, exhibited a honeycomb profile with large surface area (2107.6 m/g) and high total pore volume (1.1591 cm/g), having excellent efficiency for MG adsorption, and the biggest adsorption capacity was 2970.0 mg/g. The kinetic study together with thermodynamic analysis indicated that the adsorption of MG by LC-KCO conformed to pseudo-second-order model and the adsorption process was spontaneous, feasible, and endothermic. Moreover, LC-KCO also displayed good stability and selectivity, and can selective separate the cationic dye from binary-dye system. Furthermore, the adsorption mechanism proposed in this work manifested that the high-efficient MG adsorption by LC-KCO was a result of multiple actions including hydrogen bonding, electrostatic attraction, π-π interaction and n-π interaction as well as physical absorption. The work not only provide a fundamental theory for dye removal from wastewater, but offered a new insight for lignin valorization.
本文通过磺化木质素与各种钾化合物的简单环保一锅法协同活化碳化，制备了一系列基于木质素的多孔碳（LC），并将其用于孔雀石绿（MG）吸附。结果表明，所制备的生物炭，尤其是经过 KCO 活化后，呈现出具有大表面积（2107.6 m/g）和高总孔体积（1.1591 cm/g）的蜂窝状形貌，对 MG 吸附具有优异的效率，最大吸附容量为 2970.0 mg/g。动力学研究和热力学分析表明，LC-KCO 对 MG 的吸附符合准二级动力学模型，吸附过程是自发、可行和吸热的。此外，LC-KCO 还表现出良好的稳定性和选择性，能够从二元染料体系中选择性地分离阳离子染料。此外，本文提出的吸附机制表明，LC-KCO 对 MG 的高效吸附是多种作用的结果，包括氢键、静电吸引、π-π相互作用和 n-π相互作用以及物理吸附。这项工作不仅为废水除染料提供了基础理论，也为木质素增值利用提供了新的思路。
