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首页> 外文期刊>Journal of Molecular Liquids >Scale-up synthesis of zero-valent iron nanoparticles and their applications for synergistic degradation of pollutants with sodium borohydride
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Scale-up synthesis of zero-valent iron nanoparticles and their applications for synergistic degradation of pollutants with sodium borohydride

机译：零价铁纳米粒子的放大合成及其在硼氢化钠协同降解污染物中的应用

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摘要

The scale-up synthesis of nZVI (zero-valent iron nanoparticles) was optimized by response surface modeling (RSM). The synthesized nZVI was employed for synergistic degradation of metronidazole (MNZ) or methyl orange (MO) in the presence of sodium borohydride (NaBH4). Key parameters such as initial MNZ or MO concentration, nZVI concentration, and NaBH4 concentration for MNZ or MO removal process was optimized using central composite design (CCD). Under the optimized conditions (nZVI concentration: 150 mg/L; NaBH4:0.1 M; interaction time: 25 min for MNZ and 30 min for MO; and MNZ or MO initial concentration: 40 mg/L), the removal was synergistically increased to 100% (MNZ) and 98.07 +/- 1.1% (MO). When nZVI was applied without NaBH4, the removal of MNZ and MO were 50.62 +/- 0.28 and 43.72 +/- 0.29%, respectively. In the presence of NaBH4 alone, the removal of MNZ or MO was 6.5 +/- 1.1% and 4.2 +/- 0.7%, respectively. Addition of NaBH4 was found to enhance the remediation ability of nZVI. The MNZ or MO degradation followed pseudo first-order kinetics. The degradation mechanism was studied by UV-visible spectroscopy, XRD, SEM-EDX, FTIR, and BET analyses. The applicability of the process was tested with MNZ-spiked or MO-spiked lake water and ground water samples. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过响应表面建模（RSM）优化了nZVI（零价铁纳米粒子）的放大合成。合成的nZVI在硼氢化钠（NaBH4）存在下用于甲硝唑（MNZ）或甲基橙（MO）的协同降解。使用中央复合设计（CCD）优化了MNZ或MO去除过程的关键参数，例如初始MNZ或MO浓度，nZVI浓度和NaBH4浓度。在优化的条件下（nZVI浓度：150 mg / L; NaBH4：0.1 M;相互作用时间：MNZ 25分钟，MO 30分钟; MNZ或MO初始浓度：40 mg / L），去除率协同提高至100％（MNZ）和98.07 +/- 1.1％（MO）。当使用不含NaBH4的nZVI时，MNZ和MO的去除率分别为50.62 +/- 0.28和43.72 +/- 0.29％。仅存在NaBH4时，MNZ或MO的去除率分别为6.5 +/- 1.1％和4.2 +/- 0.7％。发现添加NaBH 4可以增强nZVI的修复能力。 MNZ或MO降解遵循伪一级动力学。通过紫外可见光谱，XRD，SEM-EDX，FTIR和BET分析研究了降解机理。该方法的适用性是用MNZ加标或MO加标的湖水和地下水样品进行测试的。 （C）2016 Elsevier B.V.保留所有权利。

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