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Microwave-assisted pyrolysis of waste lignin to prepare biochar for Cu2+ highly-efficient adsorption: Performance, kinetics and mechanism resolution

文献类型： 外文期刊

作者： Chen, Long 1 ; Hu, Jian 1 ; He, Yanying 1 ; Wang, Hong 3 ; Deng, Qianyi 1 ; Mi, Baobin 1 ; Wu, Fangfang 1 ;

作者机构： 1.Hunan Agr Univ, Coll Agron, Sch Chem & Mat Sci, Changsha 410128, Hunan, Peoples R China

2.Hunan Acad Agr Sci, Res Inst Vegetables, Changsha 410125, Peoples R China

3.Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, 1239 Siping Rd, Shanghai 200092, Peoples R China

关键词： Waste lignin; Microwave-assisted pyrolysis; Biochar; Cu(II); Adsorption mechanism

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：8.6； 五年影响因子：7.8 ）

ISSN： 1383-5866

年卷期： 2024 年 342 卷

页码：

收录情况： SCI

摘要： Alkali lignin is the major byproduct of the paper-making industry and biorefining processes. However, due to its complex structure and low reactivity, most alkali lignin is still discharged as "black liquor" or directly incinerated, resulting in significant waste of bioresources and severe environmental pollution. In this study, biochar was prepared from alkali lignin using microwave-assisted pyrolysis, and its adsorption performance and mechanism for Cu2+ were investigated. The experimental findings demonstrate that the adsorption of Cu2+ onto biochar follows the pseudo-second-order kinetic model and the Langmuir isotherm model, suggesting that the adsorption process is predominantly governed by the chemisorption mechanism. Furthermore, the qm ranged from 405.55 to 492.75 mg center dot g(-1), which is significantly higher than many other reported biochars. The adsorption mechanism includes mineral co-precipitation, DOM (mainly humic substances) adsorption, surface complexation, as well as ion exchange. The contribution of co-precipitation and surface complexation reaches 86.6 %, indicating that this biochar poses a low environmental risk. Thus, this study shows that alkali lignin could be a valuable bioresource for mitigating the environmental impact arising from Cu2+ pollution.

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