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Chitosan Modifying Nanoscale Zero Valent Iron for Tetracycline Removal from Aqueous Solutions: Proposed Pathway

机译:壳聚糖改性纳米级零价铁用于四环素从水溶液中去除:提出的途径

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摘要

For the first time, functionalized zero-valent iron/walnut shell composite (CS-WS-NZVI) was prepared by immobilizing zero-valent iron nanoparticles within walnut shell (WS) modifying with chitosan using liquid phase reduction method. Activity of CS-WS-NZVI was investigated using tetracycline (TC) as target pollutant. Batch experiments were carried out to determinate the effect of reactant concentration, pH value, solution temperature, and competitive anions. Results show that TC could be removed by physical adsorption and chemical reduction on CS-WS-NZVI in a short time with high removal rates (more than 99.02%) at the optimal experiment conditions. Then, scanning electron microscopy analysis reveals that nanoscale zero-valent iron (NZVI) was distributed dispersedly on CS-WS-NZVI without being oxidized, and the mean particle size was 30–100 nm. Characterization results of X-ray diffraction and Fourier transforms infrared spectra of CS-WS-NZVI revealed that the iron nanoparticles were successfully loaded on the surface of WS. LC-MS analysis of the treated solution showed that degradation products were mainly derived from TC after losses of some groups from the ring, and the CS-WS-NZVI can absorb both TC and its degradation products. Furthermore, degradation of TC using CS-WS-NZVI was found to follow the two-parameter pseudo-first order decay kinetics model. Overall, our results indicated that CS-WS-NZVI might be a promising functional material for TC wastewater remediation.
机译:首次,通过使用液相减少方法将核桃壳(WS)内的零价铁纳米粒子固定在核桃壳(WS)内改性核桃壳(WS)内的零价铁纳米粒子来制备官能化零价铁/核桃壳复合物(CS-WS-NZVI)。使用四环素(TC)作为目标污染物研究CS-WS-NZVI的活性。进行批量实验以确定反应物浓度,pH值,溶液温度和竞争阴离子的作用。结果表明,在最佳实验条件下,在短时间内,在短时间内,可以通过物理吸附和化学降低在CS-WS-NZVI上除去TC(超过99.02%)。然后,扫描电子显微镜分析表明,纳米级零价铁(NZVI)在CS-WS-NZVI上分散而不被氧化,并且平均粒度为30-100nm。 X射线衍射和傅里叶变换的表征结果CS-WS-NZVI的红外光谱显示,铁纳米颗粒在WS的表面上成功地装载。治疗溶液的LC-MS分析表明,在来自环的一些基团的损失之后主要来自TC,CS-WS-NZVI可以吸收TC及其降解产物。此外,发现使用CS-WS-NZVI的TC的降解遵循双参数伪第一订单衰减动力学模型。总体而言,我们的结果表明,CS-WS-NZVI可能是TC废水修复的有希望的功能材料。

著录项

  • 来源
    《Environmental Engineering Science》 |2019年第3期|273-282|共10页
  • 作者单位

    Faculty of Environmental Science and Engineering Kunming University of Science and Technology;

    Faculty of Environmental Science and Engineering Kunming University of Science and Technology;

    State Key Laboratory of Urban Water Resources and Environment School of Municipal and Environmental Engineering Harbin Institute of Technology;

    Faculty of Environmental Science and Engineering Kunming University of Science and Technology|Faculty of Environmental Science and Engineering Kunming University of Science and Technology;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    chitosan; nanoscale zero-valent iron; synergistic effect; tetracycline; walnut shell;

    机译:壳聚糖;纳米级零价铁;协同作用;四环素;核桃壳;
  • 入库时间 2022-08-18 21:49:27

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