Adsorption of nitrate from aqueous solution with ZSM-5/Fe nanosorbent based on optimizing of the isotherms conditions before determination by UV-Vis Spectrophotometry

M. Hassani, M. Zeeb, A. Monzavi, Z. Khodadadi, M. Kalaee
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引用次数: 2

Abstract

The life-threatening nature of high nitrate concentrations in various water resources motivated the present study to investigate the nitrate adsorption by ZSM-5 nanozeolite and the feasibility of increasing nitrate removal efficiency using iron-doped ZSM-5 (ZSM-5/Fe) nanosorbent. Energy dispersive X-ray diffraction analysis was employed to determine the physical properties of the adsorbent and the presence of iron particles in the nanosorbent structure and BET analysis to measure the specific surface area of the nanosorbent. The optimal adsorption conditions were determined first by modeling the central composite design (CCD) using Design Expert.7 software based on four influential factors . Then, the isotherms of nitrate adsorption under optimized conditions were investigated using the degree of fit of experimental data with Langmuir and Freundlich models for mathematical modeling of the nitrate adsorption process. Based on the test design results, the highest nitrate removal efficiency (%93.1) was reported at the contact time of 150 min, pH value of 3, adsorbent dosage of 4 g/l and initial concentration of 40 mg/l. Analysis of adsorption isotherms also confirmed the greater fit of the experimental data with the Freundlich equation, so that the correction factor of the Freundlich equation was greater than the Langmuir equation.
基于紫外可见分光光度法测定前等温线条件优化的ZSM-5/Fe纳米吸附剂对水溶液中硝酸盐的吸附
鉴于各种水资源中高浓度硝酸盐的威胁性质,本研究探讨了ZSM-5纳米沸石对硝酸盐的吸附以及使用铁掺杂ZSM-5 (ZSM-5/Fe)纳米吸附剂提高硝酸盐去除效率的可行性。采用能量色散x射线衍射分析确定吸附剂的物理性质和纳米吸附剂结构中是否存在铁颗粒,BET分析测量纳米吸附剂的比表面积。首先利用design Expert.7软件对中心复合设计(CCD)进行建模,根据4个影响因素确定最佳吸附条件;然后,利用Langmuir和Freundlich模型对硝酸盐吸附过程进行数学建模,研究了优化条件下硝酸盐吸附的等温线。根据试验设计结果,在接触时间为150 min、pH值为3、吸附剂用量为4 g/l、初始浓度为40 mg/l时,硝酸盐去除率最高,为93.1 %。吸附等温线的分析也证实了实验数据与Freundlich方程更吻合,Freundlich方程的校正因子大于Langmuir方程。
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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