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首页> 外文期刊>Journal of Polymers and the Environment >Organophosphorus Diazinon Pesticide Removing from Aqueous Solution by Zero-Valent Iron Supported on Biopolymer Chitosan: RSM Optimization Methodology
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Organophosphorus Diazinon Pesticide Removing from Aqueous Solution by Zero-Valent Iron Supported on Biopolymer Chitosan: RSM Optimization Methodology

机译：通过零价铁在生物聚合物壳聚糖（Biopogaly）壳聚糖中除去从水溶液中除去的有机磷二嗪杀虫剂：RSM优化方法

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摘要

In this study, chitosan/zero-valent iron nanoparticle (CS/nZVI) composite was synthesized for the removal of diazinon as an organophosphorus pesticide from aqueous solution. Characterizations of the synthesized composite were identified by the scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), vibrating sample magnetometer (VSM), Brunauer-Emmett-Teller (BET), thermogravimetric analysis (TGA), and differential scanning calorimetric (DSC). The surface area was obtained 90.164 m(2)g(-1)and 92.142 m(2)g(-1)by the BET method and Langmuir plot, respectively. The surface area, volume, and pore diameter of CS/nZVI were found 86.923 m(2)g(-1), 0.1623 cm(3)g(-1), and 1.85 nm, respectively from the pore size distribution curves using the Barrett-Joyner-Halenda (BJH) formula. The analysis of samples was accomplished with gas chromatography (GC). Response surface methodology (RSM) based on the central composite design (CCD) was applied to design the experiments, and survey the effects of factors on the adsorption efficiency. Analysis of variance (ANOVA) indicated that pH, adsorbent dosage, and initial concentration had a significant influence on the removal performance using the second-order polynomial model. The highest removal percent of the CCD method was equal to 96.95% in the optimum conditions. The effect of experimental variables such as contact time, pH, adsorbent dosage, and initial concentration of diazinon on the removal of diazinon was investigated. Results showed that the contact time of 20 min, pH 4.6, CS/nZVI dosage of 0.05 g, and initial diazinon concentration of 100 mg l(-1)were achieved as optimum conditions. In addition, the adsorption data fitted well with the pseudo-second-order kinetic model (R-2 = 0.9989) and Freundlich isotherm (R-2 = 0.9629). Eventually, the results of diazinon removal from the aqueous real samples revealed the great applicability of CS-nZVI for the removal of diazinon.
机译：在该研究中，合成了壳聚糖/零价铁纳米粒子（CS / NZVI）复合材料，用于从水溶液中作为有机磷农药除去二嗪酮。通过扫描电子显微镜（SEM），傅立叶变换红外光谱（FTIR），X射线衍射（XRD），能量分散X射线光谱（EDX），振动样品磁力计（VSM）鉴定合成复合材料的特征。 ，Brunauer-Emmett-Teller（Bet），热重分析（TGA）和差示扫描量热（DSC）。通过BET法和Langmuir图得到90.164m（2 )g（-1）和92.142m（2）g（-1）的表面积。 CS / NZVI的表面积，体积和孔径分别从孔径分布曲线分别发现86.923m（2）克（-1），0.1623cm（3）克（-1）和1.85nm Barrett-Joyner-Halenda（BJH）配方。用气相色谱（GC）完成对样品的分析。基于中央复合设计（CCD）的响应面方法（RSM）应用于设计实验，并调查因素对吸附效率的影响。方差分析（ANOVA）表明pH，吸附剂剂量和初始浓度对使用二阶多项式模型对去除性能的显着影响。 CCD方法的最高除去百分比在最佳条件下等于96.95％。实验变量如接触时间，pH，吸附剂剂量和二嗪孔的初始浓度的效果研究了在去除二嗪群中。结果表明，205g，pH 4.6，Cs / NZVI剂量为0.05g的接触时间，初始二胞苷浓度为100mg1（-1）作为最佳条件。此外，吸附数据与伪二阶动力学模型（R-2 = 0.9989）和Freundlich等温线（R-2 = 0.9629）很好。最终，从含水真实样品中去除二嗪顿的结果揭示了Cs-NZVI对去除二嗪顿的巨大适用性。

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