Effective Chromium Adsorption From Aqueous Solutions and Tannery Wastewater Using Bimetallic Fe/Cu Nanoparticles: Response Surface Methodology and Artificial Neural Network

IF 3.5 Q2 ENVIRONMENTAL SCIENCES

Air Soil and Water Research Pub Date : 2021-01-01 DOI:10.1177/11786221211028162

A. Mahmoud, N. Mohamed, M. Mostafa, M. Mahmoud

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引用次数: 19

Abstract

Tannery industrial effluent is one of the most difficult wastewater types since it contains a huge concentration of organic, oil, and chrome (Cr). This study successfully prepared and applied bimetallic Fe/Cu nanoparticles (Fe/Cu NPs) for chrome removal. In the beginning, the Fe/Cu NPs was equilibrated by pure aqueous chrome solution at different operating conditions (lab scale), then the nanomaterial was applied in semi full scale. The operating conditions indicated that Fe/Cu NPs was able to adsorb 68% and 33% of Cr for initial concentrations of 1 and 9 mg/L, respectively. The removal occurred at pH 3 using 0.6 g/L Fe/Cu dose, stirring rate 200 r/min, contact time 20 min, and constant temperature 20 ± 2ºC. Adsorption isotherm proved that the Khan model is the most appropriate model for Cr removal using Fe/Cu NPs with the minimum error sum of 0.199. According to khan, the maximum uptakes was 20.5 mg/g Cr. Kinetic results proved that Pseudo Second Order mechanism with the least possible error of 0.098 indicated that the adsorption mechanism is chemisorption. Response surface methodology (RSM) equation was developed with a significant p-value = 0 to label the relations between Cr removal and different experimental parameters. Artificial neural networks (ANNs) were performed with a structure of 5-4-1 and the achieved results indicated that the effect of the dose is the most dominated variable for Cr removal. Application of Fe/Cu NPs in real tannery wastewater showed its ability to degrade and disinfect organic and biological contaminants in addition to chrome adsorption. The reduction in chemical oxygen demand (COD), biological oxygen demand (BOD), total suspended solids (TSS), total phosphorus (TP), total nitrogen (TN), Cr, hydrogen sulfide (H2S), and oil reached 61.5%, 49.5%, 44.8%, 100%, 38.9%, 96.3%, 88.7%, and 29.4%, respectively.

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Fe/Cu双金属纳米粒子对水溶液和制革废水中铬的有效吸附：响应面法和人工神经网络

制革工业废水是最难处理的废水类型之一，因为它含有高浓度的有机物、油和铬。本研究成功地制备并应用了用于铬去除的双金属Fe/Cu纳米粒子（Fe/Cu NPs）。一开始，在不同的操作条件下（实验室规模），用纯铬水溶液平衡Fe/Cu纳米颗粒，然后以半全规模应用纳米材料。操作条件表明，当初始浓度为1和9mg/L时，Fe/Cu纳米颗粒能够分别吸附68%和33%的Cr。在pH值为3时，使用0.6 g/L的Fe/Cu剂量、200 r/min的搅拌速率、20 min的接触时间和20±2ºC的恒定温度进行去除。吸附等温线证明，Khan模型是使用Fe/Cu NPs去除Cr最合适的模型，最小误差和为0.199。根据khan的说法，最大吸收量为20.5mg/g Cr。动力学结果证明，伪二阶机理的最小可能误差为0.098，表明吸附机理为化学吸附。建立了具有显著p值=0的响应面法（RSM）方程，以标记Cr去除与不同实验参数之间的关系。人工神经网络的结构为5-4-1，结果表明，剂量的影响是Cr去除的主要变量。Fe/Cu纳米颗粒在实际制革废水中的应用表明，除了吸附铬外，它还具有降解和消毒有机和生物污染物的能力。化学需氧量（COD）、生物需氧量（BOD）、总悬浮物（TSS）、总磷（TP）、总氮（TN）、铬、硫化氢（H2S）和石油的减少率分别达到61.5%、49.5%、44.8%、100%、38.9%、96.3%、88.7%和29.4%。

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来源期刊

Air Soil and Water Research ENVIRONMENTAL SCIENCES-

CiteScore

7.80

自引率

5.30%

发文量

审稿时长

8 weeks

期刊介绍： Air, Soil & Water Research is an open access, peer reviewed international journal covering all areas of research into soil, air and water. The journal looks at each aspect individually, as well as how they interact, with each other and different components of the environment. This includes properties (including physical, chemical, biochemical and biological), analysis, microbiology, chemicals and pollution, consequences for plants and crops, soil hydrology, changes and consequences of change, social issues, and more. The journal welcomes readerships from all fields, but hopes to be particularly profitable to analytical and water chemists and geologists as well as chemical, environmental, petrochemical, water treatment, geophysics and geological engineers. The journal has a multi-disciplinary approach and includes research, results, theory, models, analysis, applications and reviews. Work in lab or field is applicable. Of particular interest are manuscripts relating to environmental concerns. Other possible topics include, but are not limited to: Properties and analysis covering all areas of research into soil, air and water individually as well as how they interact with each other and different components of the environment Soil hydrology and microbiology Changes and consequences of environmental change, chemicals and pollution.