Preparation of lignin-based porous carbon as an efficient absorbent for the removal of methylene blue
Preparation of lignin-based porous carbon as an efficient absorbent for the removal of methylene blue
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木质素基多孔碳的制备作为去除亚甲基蓝的高效吸收剂
DOI：
10.1016/j.indcrop.2021.113980
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发表时间：
2021-11
影响因子：
5.9
通讯作者：
Wu Yiqiang
中科院分区：
文献类型：
--
作者：
Tan Yujiao;Wang Xin;Xiong Fuquan;Ding Jiarong;Qing Yan;Wu Yiqiang
木质素是世界上最丰富的可再生芳香族聚合物，但其复杂的结构使其难以得到有效利用。本研究采用水热法和KOH活化法制备木质素基多孔炭（LPC），并将其作为吸附亚甲基蓝（MB）的吸附剂。考察了接触时间、MB初始浓度、溶液pH和吸附选择性对吸附性能的影响。层次化LPC具有较高的比表面积（3382.32 m2 /g）和大量的活性位点。对MB的最大吸附量高达1119.18 mg/g。吸附动力学符合拟二级模型。Langmuir等温线模型与吸附实验数据拟合良好。Langmuir等温线模型计算的最大吸附量为1119.65 mg/g，与实验结果接近。此外，LPC对阳离子染料具有良好的选择性吸附性能，对孔雀石绿和罗丹明B的吸附量分别为2467.30 mg/g和1657.82 mg/g。除LPC表面负电荷引起的静电相互作用外，氢键和π-π堆积相互作用是LPC吸附的主要机理。由于低成本、优异的吸附性能和良好的可重复使用性，LPC作为木质素基吸附剂在废水处理中具有广阔的应用前景。
Lignin is the most abundant renewable aromatic polymer in the world, but its complex structure makes it difficult for efficient utilization. In this study, lignin-based porous carbon (LPC) was prepared through hydrothermal treatment and KOH activation and then used as an adsorbent for the adsorption of methylene blue (MB). The influence of contact time, initial MB concentration, solution pH and adsorption selectivity on adsorption performance was explored. Hierarchical LPC showed a high specific surface area up to 3382.32 m 2/g and a large number of active sites. The maximum adsorption capacity of MB was as high as 1119.18 mg/g. The adsorption kinetic was in well agreement with pseudo-second-order model. Langmuir isotherm model fitted well to the adsorption experimental data. The maximum adsorption capacity calculated from Langmuir isotherm model (1119.65 mg/g) approached the experimental result. Moreover, the LPC exhibited the outstanding selective adsorption property to cationic dyes, where the adsorption capacities of malachite green and rhodamine B were 2467.30 mg/g and 1657.82 mg/g, respectively. In addition to electrostatic interaction due to the negatively charged surface of LPC, hydrogen bonding and π-π stacking interactions were responsibility for the adsorption mechanism. On account of low-cost, excellent adsorption properties and favorable reusability, the LPC has the promising potential as a lignin-based absorbent for removing cationic dyes in wastewater treatment.
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