Lingamdinne Prasanna Lakshmi, Choi Jong-Soo, Yang Jae-Kyu, Chang Yoon-Young, Koduru Reddy Janardhan, Singh Jiwan
Acta Chim Slov. 2018;65(3):599-610.
Graphitic carbon-like material (GCM) derived from edible sugar under a nitrogen environment was applied as an adsorbent for the removal of anionic and cationic dyes (methyl orange, MO) and methylene blue (MB) from wastewater. The physico-chemical characterization of GCM was analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The plate-like morphology with an average size of 50-100 nm was measured from the SEM images. The measured BET 'surface area and pore volume were 574 m2/g and 0.248 cm3/g, respectively with pore diameter (d), 1.8 47 (< 2 nm) indicates that the GCM classified as a microporous. The effects of dosage, pH, contact time and concentration on the adsorption of MB and MO onto GCM were studied to unveil the adsorption process. The experimental isotherm data concurred with the Langmuir isotherm model (R2 = 0.990) for MB, while the MO isotherm data concurred with Freundlich model (R2 = 0.995). The maximum adsorption capacity achieved from the Langmuir isotherm equation at 25 °C was 38.75 and 43.48 mg/g for MB and MO, respectively, which indicates that GCM is a suitable adsorbent for the adsorption of both anionic and cationic dyes. The kinetic study demonstrated that the adsorption of both dyes onto GCM was the pseudo-second-order diffusion kinetics. The thermodynamic parameters reveal the adsorption of both dyes was endothermic spontaneous through chemical interactions. The GCM was found to be a potential adsorbent for the removal of MB and MO from an aqueous solution.
在氮气环境下由食用糖衍生而来的类石墨碳材料（GCM）被用作吸附剂，用于去除废水中的阴离子和阳离子染料（甲基橙，MO）以及亚甲基蓝（MB）。通过扫描电子显微镜（SEM）、X射线衍射（XRD）、傅里叶变换红外（FT-IR）光谱和X射线光电子能谱（XPS）对GCM进行了物理化学表征。从SEM图像中测得其呈板状形态，平均尺寸为50 - 100 nm。测得的BET比表面积和孔体积分别为574 m²/g和0.248 cm³/g，孔径（d）为1.8 47（< 2 nm），表明GCM属于微孔材料。研究了剂量、pH值、接触时间和浓度对MB和MO在GCM上吸附的影响，以揭示吸附过程。实验等温线数据对于MB符合朗缪尔等温线模型（R² = 0.990），而MO等温线数据符合弗伦德里希模型（R² = 0.995）。在25°C下由朗缪尔等温线方程得到的最大吸附容量，对于MB和MO分别为38.75和43.48 mg/g，这表明GCM是一种适用于吸附阴离子和阳离子染料的吸附剂。动力学研究表明，两种染料在GCM上的吸附均为拟二级扩散动力学。热力学参数表明，两种染料的吸附都是通过化学相互作用的吸热自发过程。发现GCM是从水溶液中去除MB和MO的潜在吸附剂。
