Jia Yi, Nian Shuai, Zhao Wenxia, Fu Lin, Zhang Xiaokai, Beadham Ian, Zhao Shuchang, Zhang Changbo, Deng Yun
School of Environment and Ecology, Jiangnan University, Wuxi, 214122, China; Institute of Future Food Technology, JITRI, Yixing, 214200, China.
School of Environment and Ecology, Jiangnan University, Wuxi, 214122, China; Tongling Nonferrous Metals Holding Company Nonferrous Metals Technology Center, Tongling, 244000, China.
J Environ Manage. 2024 Jun;360:121195. doi: 10.1016/j.jenvman.2024.121195. Epub 2024 May 18.
The carbonization of lignocellulosic biomass with ionic liquids (ILs) are considered as an advantageous approach for the preparation of carbonaceous materials. The commonly used imidazolium and pyridinium based ILs have drawbacks such as toxicity, resistance to biodegradation, high cost and viscosity. These issues can be mitigated by diluting ILs with water, although excessive water content above 1 wt% can reduce the solubility of biomass. This research aims to investigate the potential of pretreating wastepaper with a "fully green" ILs, amino acid-based IL with high water content, followed by pyrolysis without IL, in enhancing the properties of biochar. For this purpose, the paper was treated with an aqueous solution of IL cysteine nitrate ([Cys][NO]), and the IL was not involved in the pyrolysis process to prevent the formation of secondary gaseous pollutants. The findings revealed that the hemicellulose and mineral filler in the paper were eliminated during pretreatment, leading to higher carbon content but lower oxygen content. As a result, the biochar exhibited micropores of 0.42 cmg and a specific surface area of 1011.21 m g. The biochar demonstrated high adsorption capacities for Cd, enrofloxacin, bisphenol A, ciprofloxacin, and tetracycline, with values of 45.20 mg g, 49.82 mg g, 49.90 mg g, 49.88 mg g, and 49.65 mg g, respectively. The proposed mechanism for the adsorption of enrofloxacin by the biochar primarily involves physical adsorption such as pore filling and electrostatic interactions, along with chemical adsorption facilitated by graphitic nitrogen.
用离子液体（ILs）使木质纤维素生物质碳化被认为是制备含碳材料的一种有利方法。常用的基于咪唑鎓和吡啶鎓的离子液体存在毒性、抗生物降解性、成本高和粘度大等缺点。尽管水含量超过1 wt%会降低生物质的溶解度，但用水稀释离子液体可以缓解这些问题。本研究旨在探讨用“全绿色”离子液体（高含水量的氨基酸基离子液体）预处理废纸，然后在不使用离子液体的情况下进行热解，以提高生物炭性能的潜力。为此，用离子液体硝酸半胱氨酸（[Cys][NO]）水溶液处理纸张，且离子液体不参与热解过程以防止形成二次气态污染物。研究结果表明，纸张中的半纤维素和矿物填料在预处理过程中被去除，导致碳含量升高但氧含量降低。结果，生物炭呈现出0.42 cmg的微孔和1011.21 m²/g的比表面积。该生物炭对镉、恩诺沙星、双酚A、环丙沙星和四环素表现出高吸附容量，吸附值分别为45.20 mg/g、49.82 mg/g、49.90 mg/g、49.88 mg/g和49.65 mg/g。生物炭吸附恩诺沙星的 proposed 机制主要涉及物理吸附，如孔隙填充和静电相互作用，以及由石墨氮促进的化学吸附。 （注：“proposed”此处可能有误，推测可能是“proposed”，应译为“提出的”）
