Purpose

Arsenic is a toxic metalloid that is present in the environment as arsenate and arsenite anions. Exposure to arsenic anions caused skin problems, degenerative diseases, kidney, liver, and lung cancer. The synthesized iron nanoparticles (NPs) were examined as a green low-cost adsorbent for the removal of arsenite anions from aqueous solution via batch adsorption procedure.

Methods

Iron NPs were prepared in a single step by the reaction of Fe⁺³ 0.01 M solution with a fresh aqueous solution of 2% w/v pomegranate peel extract (PPE) as both reducing and capping agents. The physicochemical properties of peel were investigated by some experiments and functional groups were determined by the FT-IR spectrum. The electrochemical behavior of PPE was studied using cyclic voltammetry on a glassy carbon electrode as produced a cathodic peak at range 120–400 mV. The progress of nZVI production was monitored by a decrease of 372 nm wavelength UV-Vis spectra of PPE. The 27 adsorption experiments were carried out as a function of solution pH, initial arsenite concentration, mass adsorbent, and contact time according to DOE.

Results

The rapid rate of adsorption was observed at 20–60 min, indicating that the principal mechanism dominating the sorption process was reduction and chemical adsorption. The arsenite removal efficiency was found to be dependent on the solution pH, adsorbent dose, and initial concentration, respectively.

Conclusion

The experimental data show the ability of the synthesized iron NPs to remove arsenate from solution in both synthetic and polluted natural water. The thermodynamic study suggested the spontaneous and endothermic nature of adsorption of arsenite by green synthesized iron NPs. The iron NPs synthesized with PPE increased the removal of arsenite with an increase in the active surface, indicating some chemical interactions between the adsorbent and oxoanions.

中文翻译：

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利用石榴皮提取物绿色合成纳米铁同时还原和吸附亚砷酸根阴离子

 目的

砷是一种有毒的准金属，以砷酸盐和亚砷酸盐阴离子的形式存在于环境中。接触砷阴离子会导致皮肤问题、退行性疾病、肾癌、肝癌和肺癌。合成的铁纳米颗粒（NP）被检查为一种绿色低成本吸附剂，用于通过批量吸附程序去除水溶液中的亚砷酸根阴离子。

 方法

通过 Fe ⁺³ 0.01 M 溶液与作为还原剂和封端剂的 2% w / v石榴皮提取物 (PPE) 的新鲜水溶液反应，一步制备铁纳米颗粒。通过实验研究了果皮的理化性质，并通过红外光谱测定了果皮的官能团。使用玻璃碳电极上的循环伏安法研究 PPE 的电化学行为，产生 120-400 mV 范围内的阴极峰。 nZVI 生产的进展通过 PPE 372 nm 波长 UV-Vis 光谱的减少来监测。根据 DOE，根据溶液 pH 值、初始亚砷酸盐浓度、吸附剂质量和接触时间进行了 27 次吸附实验。

 结果

在20-60分钟内观察到吸附速率较快，表明主导吸附过程的主要机制是还原和化学吸附。发现亚砷酸盐去除效率分别取决于溶液 pH 值、吸附剂剂量和初始浓度。

 结论

实验数据表明，合成的铁纳米颗粒能够去除合成水和污染的天然水中的砷酸盐。热力学研究表明绿色合成铁纳米粒子吸附亚砷酸盐具有自发和吸热性质。用 PPE 合成的铁纳米粒子随着活性表面的增加而增加了亚砷酸盐的去除，这表明吸附剂和含氧阴离子之间存在一些化学相互作用。