Removal of Fe (II) from aqueous solution by Calotropis Procera: Kinetics, isotherm s tudies, and measurement of competitive adsorption with UV-Visible spectrophotometer

Yashu Verma, P. Pandey, Shweta Choubey
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Abstract

Iron is essential heavy metal in trace quantities, but its excessive concentration as Fe2+ is present in effluents from steel mills, iron ore mines, and metal processing industries, which pollute the groundwater. Among other conventional methods, sorption by natural biomass is a low-cost alternative for iron sequestration from an aqueous solution. The root of a native weed plant Calotropis Procera was used to optimize the adsorption parameters like pH, contact time, sorbent dose, and initial adsorbate concentration. Competitive adsorption of Fe2+ in the presence of cations (Ni2+, Cd2+, Cr3+, Zn2+, Ca2+, Mg2+, As3+) and anions (Cl-, SO42- , F-) was also studied. Batch adsorption studies were carried out to evaluate adsorption isotherm by Langmuir and Freundlich isotherm models. Leaching of biomass significantly improved iron uptake capacity from 15 mg g-1 to 80 mg g-1. The kinetics of the reaction was fast, with equilibrium conditions attaining in 30 minutes. FTIR study of the biomass revealed the presence of -COOH, -NH groups responsible for the metal binding mechanism. The biomass could be regenerated with 0.1 M HNO3 for further use. Iron removal from simulated acidic water was done under optimum conditions and absorbance was measured by a UV-Visible spectrophotometer.
Procera法去除水中铁(II):动力学、等温线研究和紫外可见分光光度计测定竞争吸附
铁是必需的微量重金属,但其浓度过高的Fe2+存在于钢铁厂、铁矿和金属加工工业的废水中,污染了地下水。在其他传统方法中,天然生物质吸附是从水溶液中隔离铁的一种低成本替代方法。以本地杂草植物卡罗普斯(Calotropis Procera)的根为材料,对pH、接触时间、吸附剂剂量和初始吸附质浓度等吸附参数进行了优化。研究了Fe2+在阳离子(Ni2+、Cd2+、Cr3+、Zn2+、Ca2+、Mg2+、As3+)和阴离子(Cl-、SO42-、F-)存在下的竞争吸附。采用Langmuir和Freundlich等温线模型对吸附等温线进行了批量吸附研究。生物质浸出显著提高铁吸收能力,从15 mg g-1提高到80 mg g-1。反应动力学快,30分钟内达到平衡条件。对生物质的FTIR研究揭示了-COOH, -NH基团的存在,负责金属结合机制。0.1 M HNO3可使生物质再生,供进一步利用。在最佳条件下对模拟酸性水中的铁进行了脱除,并用紫外可见分光光度计测定了其吸光度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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