Highly efficient Ni(II) adsorption by industrial lignin-based biochar: a pivotal role of dissolved substances within biochar

文献类型： 外文期刊

第一作者： He, Yanying

作者： He, Yanying;Deng, Qianyi;Cao, Liwen;Luo, Cheng;Zhao, Wenjie;Tao, Honglin;Chen, Long;Zhu, Yule;Zhang, Jing;Mo, Xueying;Mi, Baobin;Wu, Fangfang;Mi, Baobin

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关键词： Industrial alkali lignin; Biochar; Adsorption; Ni(II); Adsorption mechanism

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：5.8； 五年影响因子：5.4 ）

ISSN： 0944-1344

年卷期： 2024 年 31 卷 7 期

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收录情况： SCI

摘要： In the context of carbon neutrality, promoting resource utilization of industrial alkali lignin addressing heavy metal pollution is crucial for China's pollution alleviation and carbon reduction. Microwave pyrolysis produced functionalized biochar from industrial alkali lignin for Ni(II) adsorption. LB400 achieved 343.15 mg g(-1) saturated adsorption capacity in 30 min. Pseudo-second-order kinetic and Temkin isotherm models accurately described the adsorption, which was endothermic and spontaneous (Delta G(theta) < 0, Delta H-theta > 0). Quantitative analysis revealed that both dissolved substances and carbon skeleton from biochar contributed to adsorption, with the former predominates (93.76%), including mineral precipitation NiCO3 (Q(p)) and adsorption of dissolved organic matter (Q(DOM)). Surface complexation (Qc) and ion exchange (Qi) on the carbon skeleton accounted for 6.3%. Higher biochar preparation temperature reduced Ni(II) adsorption by dissolved substances. Overall, biochar which comes from the advantageous disposal of industrial lignin effectively removes Ni(II) contamination, encouraging ecologically sound treatment of heavy metal pollution and sustainable resource utilization.

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