Division of Computational Mathematics and Engineering, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam; Faculty of Environment & Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
Department of Materials Science and Engineering, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam, 13120, South Korea.
Chemosphere. 2021 Dec;284:131312. doi: 10.1016/j.chemosphere.2021.131312. Epub 2021 Jun 23.
In this study, we investigated the feasibility on the utilization of coffee husk as biosorbents for the removal of heavy metal ions such as Pb and Cd from wastewater. Biochar was produced from coffee wastes and modified with sodium hydroxide to create functional groups on the surface and increase the specificic surface area. The resultant products were characterized by using various analytical methods such as scanning electron microscopy, specific area, surface functional group and zeta potential analysis. The as-prepared materials were employed as adsorbent to remove Pb and Cd ions from wastewater. The maximum sorption capacities of biosorbents were measured to be 116.3 and 139.5 mg g for Cd and Pb, respectively, which is comparable to the conventional adsorbents. Kinetic studies showed that the sorption of Pb and Cd on biosorbents can be described by the Freundlich isotherm and second-order kinetic model. The coffee husk-derived biosorbent was capable of removing 89.6% of Pb and 81.5% Cd ions from wastewater, and therefore can be considered as low-cost and efficient adsorbent to remove heavy metal ions from wastewater.
在这项研究中，我们研究了利用咖啡渣作为生物吸附剂从废水中去除重金属离子（如 Pb 和 Cd）的可行性。咖啡废料制成生物炭，并经过氢氧化钠改性，在表面形成官能团，增加比表面积。通过扫描电子显微镜、比表面积、表面官能团和动电电位分析等多种分析方法对所得产物进行了表征。所制备的材料被用作吸附剂，从废水中去除 Pb 和 Cd 离子。测量得到的生物吸附剂对 Cd 和 Pb 的最大吸附容量分别为 116.3 和 139.5mg/g，与传统吸附剂相当。动力学研究表明，Pb 和 Cd 在生物吸附剂上的吸附可以用 Freundlich 等温线和二级动力学模型来描述。从咖啡壳中提取的生物吸附剂能够去除废水中 89.6%的 Pb 和 81.5%的 Cd 离子，因此可以考虑将其作为一种从废水中去除重金属离子的低成本、高效吸附剂。
