一步法制备富氧木质素活性炭及其亚甲基蓝吸附性能

doi:10.11949/0438-1157.20201285

化工学报 ›› 2021, Vol. 72 ›› Issue (5): 2826-2836.DOI: 10.11949/0438-1157.20201285

一步法制备富氧木质素活性炭及其亚甲基蓝吸附性能

王晶^1,²(),韩巧宁^1,²,雷以廷^1,²,唐曼^1,²,陈丽红^1,²,车俊达^1,²,刘祖广^1,²()

^1.广西民族大学化学化工学院，广西南宁 530006
^2.广西林产化学与工程重点实验室，广西林产化学与工程协同创新中心，广西南宁 530006

收稿日期:2020-09-08 修回日期:2020-11-04 出版日期:2021-05-05 发布日期:2021-05-05
通讯作者: 刘祖广
作者简介:王晶（1993—），女，硕士研究生，2783167561@qq.com
基金资助:
国家自然科学基金项目(31660180);广西大学生创新创业训练计划项目(201910608)

One-step preparation of oxygen-enriched lignin activated carbon and its methylene blue adsorption performance

WANG Jing^1,²(),HAN Qiaoning^1,²,LEI Yiting^1,²,TANG Man^1,²,CHEN Lihong^1,²,CHE Junda^1,²,LIU Zuguang^1,²()

^1.School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, Guangxi, China
^2.Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Collaborative Innovation Center of Forest Chemistry and Engineering, Nanning 530006, Guangxi, China

Received:2020-09-08 Revised:2020-11-04 Online:2021-05-05 Published:2021-05-05
Contact: LIU Zuguang

摘要/Abstract

摘要：

以硫酸盐造纸黑液木质素为原料，分别采用磷酸活化和磷酸、硫酸混合酸活化制备了两类不同结构的木质素活性炭，对其进行了扫描电镜（SEM）、红外光谱（FTIR）、氮气吸附脱附、元素分析和Boehm酸值滴定等表征分析，并将制备的活性炭应用于模拟亚甲基蓝（MB）染料废水的吸附。结果表明，混合酸活化制备的木质素活性炭比单独磷酸活化的木质素活性炭的比表面积、总孔体积、介孔体积、氧含量分别增加了27.9%、26.4%、29.3%和29.2%，并且孔径分布更趋集中。混合酸活化活性炭在pH为2~9的范围内对亚甲基蓝均有优异的吸附性能，最大饱和吸附量达到1118.90 mg·g^-1，比磷酸活化木质素活性炭的吸附量增加了20.3%，表现出良好的吸附性能。吸附速率快，吸附过程遵循Langmuir等温线和伪二级动力学方程，颗粒内扩散不是唯一的决速步骤。

关键词: 木质素, 活性炭, 磷酸, 硫酸, 亚甲基蓝, 吸附

Abstract:

Two types of lignin activated carbon with different structures were prepared from kraft lignin using phosphoric acid activation or mixed acid consisting of phosphoric acid and sulfuric acid as activating agents, respectively. The activated carbon was characterized by scanning electron microscope (SEM), infrared spectrum (FTIR), nitrogen adsorption and desorption, elemental analysis and Boehm acid value titration. The prepared activated carbon was applied to the adsorption of methylene blue (MB) dye wastewater. The results showed that the specific surface area, total pore volume, mesoporous volume and oxygen content of the carbon activated by mixed acid were 27.9%, 26.4%, 29.3% and 29.2% higher than those of the carbon activated by phosphoric acid alone, respectively, and distribution becomes more concentrated. Thus, the carbon activated by mixed acid has excellent adsorption performance for methylene blue in the range of pH 2—9, and the maximum saturated adsorption capacity reaches 1118.90 mg·g^-1, which is 20.3% higher than that of the carbon activated by phosphoric acid, showing good adsorption performance. The adsorption rate is fast, the adsorption process follows Langmuir adsorption isotherm and the pseudo-second-order kinetic equation, and the intra-particle diffusion is not the only decisive step.

Key words: lignin, activated carbon, phosphoric acid, sulfuric acid, methylene blue, adsorption

中图分类号:

TQ 424

王晶, 韩巧宁, 雷以廷, 唐曼, 陈丽红, 车俊达, 刘祖广. 一步法制备富氧木质素活性炭及其亚甲基蓝吸附性能[J]. 化工学报, 2021, 72(5): 2826-2836.

WANG Jing, HAN Qiaoning, LEI Yiting, TANG Man, CHEN Lihong, CHE Junda, LIU Zuguang. One-step preparation of oxygen-enriched lignin activated carbon and its methylene blue adsorption performance[J]. CIESC Journal, 2021, 72(5): 2826-2836.

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一步法制备富氧木质素活性炭及其亚甲基蓝吸附性能

One-step preparation of oxygen-enriched lignin activated carbon and its methylene blue adsorption performance

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