Department of Chemistry, The Gandhigram Rural Institute, Deemed to Be University, Gandhigram, 624 302, Dindigul, Tamil Nadu, India.
Department of Chemistry, The Gandhigram Rural Institute, Deemed to Be University, Gandhigram, 624 302, Dindigul, Tamil Nadu, India.
Chemosphere. 2021 Jan;262:128317. doi: 10.1016/j.chemosphere.2020.128317. Epub 2020 Sep 11.
The development of industrialization and agricultural activities have carried various negative impacts to living organisms in recent decades and also, the frequent problem of inorganic pollution have been environmental anxiety to the community. Among these, Cr and F are priority poisonous pollutants from many industries. In this work, we present a low-cost synthesis procedure to obtain biocompatible zirconium incorporated chitosan-gelatin composite (CS-Zr-GEL) were fabricated and explored for the adsorptive removal of toxic Cr and F from water. The adsorption mechanism of toxic Cr and F was done by batch mode as a function of contact time, solution pH and co-existing ions. The obtained materials were extensively studied by several physico-chemical techniques to access their properties by X-ray diffraction (XRD), scanning electron microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC) analysis. Additionally, the fabricated adsorbent is highly dependent on solution pH. The kinetic and isotherm data were fitted using pseudo-second-order kinetic and Langmuir isotherm models. The maximum adsorption capacity for CS-Zr-GEL is 138.89 and 12.13 mg/g at 323K for Cr and F respectively. These findings demonstrate that the CS-Zr-GEL adsorbent represents a promising candidate that would have a practical influence on water/wastewater treatments.
在最近几十年，工业化和农业活动的发展给生物带来了各种负面影响，同时，无机污染问题也频繁地给社区带来环境焦虑。在这些污染物中，Cr 和 F 是许多工业的优先有毒污染物。在这项工作中，我们提出了一种低成本的合成方法，以获得生物相容性的锆掺杂壳聚糖-明胶复合材料（CS-Zr-GEL），并探索其对水中有毒 Cr 和 F 的吸附去除。通过分批模式研究了有毒 Cr 和 F 的吸附机制，作为接触时间、溶液 pH 和共存离子的函数。通过 X 射线衍射（XRD）、带有能量色散 X 射线光谱（SEM-EDX）的扫描电子显微镜、傅里叶变换红外光谱（FTIR）、BET、热重分析（TGA）和差示扫描量热法（DSC）分析等多种物理化学技术对获得的材料进行了广泛研究，以了解其性质。此外，所制备的吸附剂高度依赖于溶液 pH 值。动力学和等温线数据分别采用伪二阶动力学和 Langmuir 等温线模型进行拟合。CS-Zr-GEL 对 Cr 和 F 的最大吸附容量分别为 138.89 和 12.13mg/g，在 323K 下。这些发现表明，CS-Zr-GEL 吸附剂是一种很有前途的候选材料，将对水/废水处理产生实际影响。
