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Nanoporous biochar with high specific surface area based on rice straw digestion residue for efficient adsorption of mercury ion from water
Bioresource Technology ( IF 9.7 ) Pub Date : 2022-06-13 , DOI: 10.1016/j.biortech.2022.127471 Zhiyuan Liu 1 , Feng Zhen 2 , Quanguo Zhang 3 , Xin Qian 4 , Wenzhe Li 5 , Yong Sun 1 , Lingling Zhang 6 , Bin Qu 6
Bioresource Technology ( IF 9.7 ) Pub Date : 2022-06-13 , DOI: 10.1016/j.biortech.2022.127471 Zhiyuan Liu 1 , Feng Zhen 2 , Quanguo Zhang 3 , Xin Qian 4 , Wenzhe Li 5 , Yong Sun 1 , Lingling Zhang 6 , Bin Qu 6
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The unreasonable disposal of residue after anaerobic digestion seriously affects the stability of the ecosystem, and the preparation of adsorbent is an effective way to value-added utilization of the residue. In this study, a high adsorption capacity (209.65 mg/g) biochar-based adsorbent was prepared by hydrothermal carbonization and alkali modification using rice straw biogas residue. The lignocellulosic structure was destroyed after anaerobic digestion, forming porous biochar with larger specific surface area (2372.51 m/g) and richer pore structure. Besides, the mercury ion complexed on the adsorbent surface in monovalent and divalent forms and possessed favorable selectivity in the presence of other examples of interference. The adsorption process is consistent with pseudo second-order kinetics and the Langmuir isotherm, indicating a predominance of chemisorption. This study provides a methodology for use of rice straw biogas residue and treatment of mercury containing wastewater, which offers a fresh direction for resource utilization of biogas residue.
中文翻译：
基于稻草消化残渣的高比表面积纳米多孔生物炭高效吸附水中汞离子
厌氧消化后残渣的不合理处置严重影响生态系统的稳定性，制备吸附剂是残渣增值利用的有效途径。本研究以稻草沼渣为原料，通过水热炭化和碱改性制备了高吸附容量（209.65 mg/g）的生物炭基吸附剂。厌氧消化后木质纤维素结构被破坏，形成比表面积更大(2372.51 m/g)、孔隙结构更丰富的多孔生物炭。此外，汞离子以一价和二价形式络合在吸附剂表面，并且在其他干扰存在下具有良好的选择性。吸附过程符合伪二级动力学和朗缪尔等温线，表明化学吸附占主导地位。本研究提供了稻草沼渣利用及含汞废水处理的方法，为沼渣资源化利用提供了新的方向。
更新日期：2022-06-13
中文翻译：
基于稻草消化残渣的高比表面积纳米多孔生物炭高效吸附水中汞离子
厌氧消化后残渣的不合理处置严重影响生态系统的稳定性，制备吸附剂是残渣增值利用的有效途径。本研究以稻草沼渣为原料，通过水热炭化和碱改性制备了高吸附容量（209.65 mg/g）的生物炭基吸附剂。厌氧消化后木质纤维素结构被破坏，形成比表面积更大(2372.51 m/g)、孔隙结构更丰富的多孔生物炭。此外，汞离子以一价和二价形式络合在吸附剂表面，并且在其他干扰存在下具有良好的选择性。吸附过程符合伪二级动力学和朗缪尔等温线，表明化学吸附占主导地位。本研究提供了稻草沼渣利用及含汞废水处理的方法，为沼渣资源化利用提供了新的方向。
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