Zhang Nan, Qiao Yang, Zhang Jinrong, Cui Pengfei, Liu Xufei
College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an, China.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2025;60(3):112-120. doi: 10.1080/10934529.2025.2520168. Epub 2025 Jun 25.
Mining-induced heavy metal pollution poses an urgent ecological challenge. Recently, biochar, especially corn stover biochar (CSB) modified with ionic liquids (ILs) for weak interactions, has shown promise in mine water remediation. In this study, we used charred corn stover as biochar and synthesized 1-methyl-3-[3-(trimethoxysilyl) propyl] imidazolium IL as modifier to create imidazolium-based IL-modified biochar. The chemical structure of the IL and the chemical composition of the biochar were analyzed with the help of NMR and FT-IR. Characterization techniques such as XPS, SEM, and nitrogen adsorption-desorption measurements were employed to investigate the elemental composition, surface morphology, pore size, porosity, and other physicochemical properties of the corn straw biochar. Cd was chosen as the representative of heavy metal ions in mine water, and the adsorption kinetics and isotherm experiments were conducted to study the adsorption performance of CSB on heavy metal ions. The results exhibited that the adsorption performance of IL-modified CSB material ( = 48.1000 mg/g) for heavy metals was enhanced to a certain extent compared with that of unmodified CSB material ( = 44.0000 mg/g). This provided a foundation for using corn straw biochar to remove heavy metals in mine water.
采矿引起的重金属污染构成了紧迫的生态挑战。最近，生物炭，特别是用离子液体（ILs）进行弱相互作用改性的玉米秸秆生物炭（CSB），在矿井水修复方面显示出了潜力。在本研究中，我们使用炭化的玉米秸秆作为生物炭，并合成了1-甲基-3-[3-(三甲氧基甲硅烷基)丙基]咪唑鎓离子液体作为改性剂，以制备咪唑基离子液体改性生物炭。借助核磁共振（NMR）和傅里叶变换红外光谱（FT-IR）分析了离子液体的化学结构和生物炭的化学成分。采用X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和氮吸附-脱附测量等表征技术，研究了玉米秸秆生物炭的元素组成、表面形态、孔径、孔隙率和其他物理化学性质。选择镉作为矿井水中重金属离子的代表，进行吸附动力学和等温线实验，以研究CSB对重金属离子的吸附性能。结果表明，与未改性的CSB材料（吸附量=44.0000mg/g）相比，离子液体改性CSB材料（吸附量=48.1000mg/g）对重金属的吸附性能有一定程度的提高。这为利用玉米秸秆生物炭去除矿井水中的重金属奠定了基础。
