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Green synthesis and application of nanoscale zero-valent iron/rectorite composite material for P-chlorophenol degradation via heterogeneous Fenton reaction
Journal of Saudi Chemical Society ( IF 5.8 ) Pub Date : 2019-02-14 , DOI: 10.1016/j.jscs.2019.02.001
Teng Bao , Jie Jin , Mekdimu Mezemir Damtie , Ke Wu , Zhi Ming Yu , Lie Wang , Jun Chen , Yong Zhang , Ray L. Frost

A zero-valent iron/rectorite nanocomposite (NZVI/rectorite) was developed as a heterogeneous H2O2 catalyst for P-chlorophenol degradation. The physicochemical properties of NZVI/rectorite were characterized by various techniques including X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive spectrometry, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller analysis. Results showed that NZVI sphere nanoparticles were successfully loaded on the rectorite surface with less aggregation and good dispersion. Moreover, compared with acid-leached rectorite (30.91 m2/g), the NZVI/rectorite appeared to have larger surface area (50.75 m2/g). In addition, the effects of pH, reaction time, initial P-chlorophenol concentration, catalyst amount, and H2O2 dosage on the P-chlorophenol degradation were systematically investigated. Results showed that NZVI/rectorite presents better properties for the degradation and mineralization of P-chlorophenol compared with pristine NZVI due to the large surface area, low aggregation, and good dispersion of the former. The degradation mechanisms of P-chlorophenol by NZVI/rectorite were adsorption and reduction coupled with a Fenton-like reaction. Four successive runs of the stability and regeneration study also showed that the NZVI/rectorite were unchanged even after 100% of P-chlorophenol degradation ratio. This study has extended the application of NZVI/rectorite as environment function material for the removal of P-chlorophenol from the environment.



中文翻译:

异种芬顿反应降解P-氯酚的纳米级零价铁/锂蒙脱石复合材料的绿色合成及应用

零价铁/锂蒙脱石纳米复合材料(NZVI /锂蒙脱石)被开发为用于对氯苯酚降解的非均相H 2 O 2催化剂。NZVI /锂蒙脱石的理化特性通过多种技术进行了表征,包括X射线衍射,扫描电子显微镜,透射电子显微镜,能量色散光谱,傅立叶变换红外光谱,X射线光电子光谱以及Brunauer-Emmett-Teller分析。结果表明,NZVI球形纳米颗粒成功地负载在累托石表面上,具有较少的聚集和良好的分散性。此外,与酸浸累托石(30.91 m 2 / g)相比,NZVI /锂蒙脱石的表面积更大(50.75 m 2)。/G)。此外,pH值,反应时间,对氯苯酚的初始浓度,催化剂量和H 2 O 2的影响剂量对对氯苯酚的降解进行了系统的研究。结果表明,与原始NZVI相比,NZVI /锂蒙脱石具有更好的对氯苯酚降解和矿化性能,这是由于前者的表面积大,聚集度低和分散性好。NZVI /锂蒙脱石对对氯苯酚的降解机理是吸附和还原以及类芬顿反应。四个连续的稳定性和再生研究结果还表明,即使在100%的对氯苯酚降解率之后,NZVI /锂蒙脱石也没有变化。这项研究扩展了NZVI /锂蒙脱石作为环境功能材料从环境中去除对氯苯酚的应用。

更新日期:2019-02-14
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