利用活化生物炭从水中快速吸附药物的新机理见解。
New mechanistic insight into rapid adsorption of pharmaceuticals from water utilizing activated biochar.
机构信息
Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, FI-70211, Kuopio, Finland; Geology Department, Faculty of Science, Suez University, El Salam City, P.O. Box 43518, Suez Governorate, Egypt.
Korea Biochar Research Center, APRU Sustainable Waste Management Program & Division of Environmental Science and Ecological Engineering, Korea University, Seoul, 02841, Republic of Korea; Soils and Plant Nutrition Division, Coconut Research Institute, Lunuwila, 61150, Sri Lanka.
出版信息
Environ Res. 2021 Nov;202:111693. doi: 10.1016/j.envres.2021.111693. Epub 2021 Jul 13.
The presence of emerging pollutants especially hazardous chemicals and pharmaceuticals in aquatic environments is a matter of grave concern to human health and the environment. In this study, coffee bean waste (CBW) was utilized to synthesize pristine (CBW) and activated (CBW) biochars for the elimination of diclofenac (DF) and levofloxacin (LEV) from water. A facile two-step approach was used to synthesize CBW using chemical pretreatment and pyrolysis under N purging. BET results of CBW revealed that chemical pretreatment increased surface area by approximately 160 times compared to CBW. The calculated I/I ratio from Raman spectra confirmed that CBW had a high functionalized surface. Different operational parameters such as contact time, pH, adsorbent dose, ionic strength, and adsorbate concentration were studied and optimized. Maximum Langmuir adsorption capacity of CBW was found to be 61.17 and 110.70 mg/g for DF and LVX, respectively. Experimental results demonstrated that presence of NaCl in solution enhanced DF removal efficiency due to the salting-out effect. Electrostatic attraction, π-π bonding, and hydrophobic interaction were prominently responsible mechanisms for the adsorption of DF and LVX. Furthermore, continuous-flow mode studies confirmed that CBW can be successfully utilized in large-scale treatment applications.
新兴污染物，尤其是有害化学物质和药品在水生环境中的存在，对人类健康和环境构成严重关切。在这项研究中，我们利用咖啡豆废料（CBW）合成了原始（CBW）和活化（CBW）生物炭，以去除水中的双氯芬酸（DF）和左氧氟沙星（LEV）。采用简便的两步法，通过化学预处理和 N 吹扫下的热解合成 CBW。CBW 的 BET 结果表明，与 CBW 相比，化学预处理使表面积增加了约 160 倍。拉曼光谱的计算 I/I 比证实 CBW 具有高功能化表面。研究并优化了不同的操作参数，如接触时间、pH 值、吸附剂剂量、离子强度和吸附物浓度。CBW 对 DF 和 LVX 的最大 Langmuir 吸附容量分别为 61.17 和 110.70 mg/g。实验结果表明，溶液中 NaCl 的存在由于盐析效应增强了 DF 的去除效率。静电吸引、π-π 键合和疏水相互作用是吸附 DF 和 LVX 的主要机制。此外，连续流动模式研究证实，CBW 可成功用于大规模处理应用。
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