合成氧化铁纳米粒子(Fe2O3-NPs)和氧化铝纳米粒子(Al2O3-NPs)对砷(v)的吸附

Muhammad Tahir Turi, Ma Wei, Ittehad Hussain, Javid Hussain
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引用次数: 0

摘要

砷,是对人类健康危害最大的元素之一,是慢性疾病,并不断对世界造成威胁。砷以化合形式存在于地表下的岩石中,当它溶解时,会污染地下水。在本研究中,合成了氧化铁纳米颗粒(Fe2O3-NPs)和氧化铝纳米颗粒(Al2O3-NPs)用于去除水中介质中的砷(As),并通过FT-IR光谱和XRD光谱等不同的分析技术对合成材料进行了表征。结果表明,Fe2O3-NPs和Al2O3-NPs合成成功。并将合成的材料作为吸附剂用于水中砷(V)的萃取。考察了pH、温度、接触时间、吸附剂用量等参数对吸附过程的影响。Fe2O3-NPs的吸附效率为20 mg/g, Al2O3-NPs的吸附效率为19.5 mg/g。从工业水中定量去除as (V)需要最少量(0.2 g)的Fe2O3-NPs和Al2O3-NPs。本研究考察了各种动力学和等温线。结果表明,所得Fe2O3-NPs数据更符合拟二级动力学和Freundlich方程,而Al2O3-NPs数据更符合拟二级动力学和Elovich模型方程,证实了as (V)与吸附剂之间的相互作用。热力学参数的研究表明,该过程是自发的吸热过程。该模型用于估计每个吸附剂的位置能量分布。研究了吸附剂的热力学参数,表明吸附剂具有吸热和非自发性质。根据近似位置能量分布的分析结果,在砷中加入Fe2O3和Al2O3-NPs使吸附位置能量频率分布曲线下的面积减小,从而减少了对砷开放的吸附位置的数量。这可能是由于Fe2O3和Al2O3-NPs疏水表面的阻断,减少了合成材料与砷之间的疏水相互作用。
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Arsenic (v) Adsorption by Using Synthesized Iron Oxide Nanoparticles (Fe2O3-NPs) and Aluminum Oxide Nanoparticles (Al2O3-NPs)
Arsenic, is one of the most harmful elements to humans, health of chronic diseases, and continuously causing a threat to the world. Arsenic is found in combined form in rocks under the earth's surface and when it dissolves, it contaminates groundwater. In the current research study synthesized iron oxide nanoparticles (Fe2O3-NPs) and aluminum oxide nanoparticles (Al2O3-NPs) for the removal of arsenic (As) (˅) from an aqueous medium and characterized the synthesized material by different analytical techniques such as FT-IR spectroscopy and XRD spectroscopy. The results show successful synthesis of Fe2O3-NPs and Al2O3-NPs. Furthermore, the synthesized material was used as an adsorbent for extraction of as (V) from water. The effect of different parameters such as pH, temperature, contact time, and adsorbent dose on the adsorption process was investigated. The adsorption efficiency was determined by Fe2O3-NPs at about 20 mg/g and Al2O3-NPs at 19.5 mg/g. The quantitative removal of as (V) from industrial water required a minimum amount (0.2 g) of Fe2O3-NPs and Al2O3-NPs. various kinetic and isotherms were investigated in the current study. The result showed that the obtained data for Fe2O3-NPs was more fitted to Pseudo second order kinetic and Freundlich equation, while for Al2O3-NPs the data was more fitted to Pseudo second order kinetic and Elovich model equation, which confirms the interaction among as (V) and adsorbents. Thermodynamic parameters were also investigated which shows the process is spontaneous and endothermic. This model was used to estimate the site energy distribution for each adsorbent. Thermodynamic parameters were also investigated which shows the non-spontaneous and endothermic nature of the adsorbent. According to the results of the analysis of the approximate site energy distribution, adding Fe2O3 and Al2O3-NPs to arsenic decreased the area under the frequency distribution curve of the sorption site energies, which in turn decreased the number of sorption sites that were open to arsenic. This might be explained by the hydrophobic interaction between synthesized materials and arsenic being reduced due to the blocking of the Fe2O3 and Al2O3-NPs hydrophobic surface.
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