Belcaid A, Beakou B H, El Hassani K, Bouhsina S, Anouar A
Faculty of Science and Technology, Laboratory of Applied Chemistry and Environment, Hassan First University of Settat, Settat, 26000 Morocco E-mail:
Unit of Environmental Chemistry and Interactions with Life, University Littoral Côte d'Opale, Dunkirk, 59140 France.
Water Sci Technol. 2021 Feb;83(3):556-566. doi: 10.2166/wst.2020.585.
Heavy metals are one of the most dangerous and critical threats to human and environment. In this study, the adsorption efficiency of activated carbon from cassava peels considered as agricultural waste (CPR) was evaluated for removal of heavy metals Cr (VI) and Co (II) from aqueous media. Cassava peel carbon (CPC) was obtained by acid treatment. Structural and morphological properties were investigated using Fourier Transform Infra-Red (FTIR), Scanning Electron Microscopy (SEM), Brunauer-Emmet-Teller surface area (BET) and X-Ray Diffraction (XRD). The adsorption experiments were conducted in batch mode under natural solution pH and complexation of the heavy metals, which allows the use of UV-Visible spectroscopy technique. CPC adsorbent exhibited a high adsorption capacity, according to Langmuir model, for Cr (VI) (166.35 mg/g) and Co (II) (301.63 mg/g) at 25 °C. Kinetic and adsorption isotherms followed the pseudo second-order and Langmuir isotherm models for both metals, respectively. Thermodynamic study confirmed the spontaneity and endothermic nature of both metals adsorption onto CPC surface.
重金属是对人类和环境最危险、最关键的威胁之一。在本研究中，对被视为农业废弃物的木薯皮活性炭（CPR）从水介质中去除重金属Cr（VI）和Co（II）的吸附效率进行了评估。木薯皮炭（CPC）通过酸处理获得。使用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、布鲁诺尔-埃米特-泰勒表面积（BET）和X射线衍射（XRD）对其结构和形态特性进行了研究。吸附实验在自然溶液pH值和重金属络合条件下以分批模式进行，这使得可以使用紫外可见光谱技术。根据朗缪尔模型，CPC吸附剂在25°C时对Cr（VI）（166.35 mg/g）和Co（II）（301.63 mg/g）表现出高吸附容量。两种金属的动力学和吸附等温线分别遵循准二级和朗缪尔等温线模型。热力学研究证实了两种金属吸附到CPC表面的自发性和吸热性质。
