Salmani Mohammad Hossein, Abedi Mohammad, Mozaffari Sayed Ahmad, Mahvi Amir Hossien, Sheibani Ali, Jalili Mahrokh
Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Science, Yazd, Iran.
Institute of Chemical Technology, Iranian Research Organization for Science and Technology, Tehran, Iran.
J Environ Health Sci Eng. 2021 Mar 11;19(1):603-612. doi: 10.1007/s40201-021-00631-y. eCollection 2021 Jun.
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.
Iron NPs were prepared in a single step by the reaction of Fe 0.01 M solution with a fresh aqueous solution of 2% / 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.
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.
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.
砷是一种有毒类金属，在环境中以砷酸盐和亚砷酸盐阴离子的形式存在。接触砷阴离子会引发皮肤问题、退行性疾病以及肾癌、肝癌和肺癌。通过批量吸附程序，对合成的铁纳米颗粒（NPs）作为一种绿色低成本吸附剂从水溶液中去除亚砷酸盐阴离子进行了研究。
通过将0.01M的铁溶液与2%的新鲜石榴皮提取物（PPE）水溶液反应，一步制备铁纳米颗粒，PPE作为还原剂和封端剂。通过一些实验研究了果皮的物理化学性质，并通过傅里叶变换红外光谱确定了官能团。在玻碳电极上使用循环伏安法研究了PPE的电化学行为，在120 - 400mV范围内产生了一个阴极峰。通过PPE的372nm波长紫外可见光谱的降低来监测零价铁（nZVI）生成的进程。根据实验设计（DOE），作为溶液pH值、初始亚砷酸盐浓度、吸附剂质量和接触时间的函数进行了27次吸附实验。
在20 - 60分钟观察到快速的吸附速率，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。
实验数据表明合成的铁纳米颗粒能够在合成水和受污染的天然水中从溶液中去除砷酸盐。热力学研究表明绿色合成的铁纳米颗粒吸附亚砷酸盐具有自发和吸热的性质。用PPE合成的铁纳米颗粒随着活性表面的增加提高了亚砷酸盐的去除率，表明吸附剂与含氧阴离子之间存在一些化学相互作用。
