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首页> 外文期刊>ACS applied materials & interfaces >Facile and Economical Synthesis of Large Hollow Ferrites and Their Applications in Adsorption for As(V) and Cr(VI)
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Facile and Economical Synthesis of Large Hollow Ferrites and Their Applications in Adsorption for As(V) and Cr(VI)

机译：大型空心铁氧体的简便经济合成及其在As（V）和Cr（VI）吸附中的应用

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摘要

Unlike the previous ferrites (MFe2O4; M = Fe, Co, Zn, and Mn) solid nanospheresanoparticles, which were prepared by polluted solvothermal (glycol) approaches, here controllable monodisperse porous ferrites hollow nanospheres are promptly synthesized by a nontemplate hydrofhermal method which has introduced an addition agent, polyacrylamide. The hollow nanospheres with different size can be prepared by varying the synthetic compositions. Scanning/transmission micros-graphs show the outside diameters of ferrite nanospheres are 180-380 nm and the shell thicknesses of that are only 20-45 nm, which could be adjusted by controlling CH3COONa concentration. X-ray diffraction (XRD) and X-ray photoelectron (XPS) spectroscopy, scanning electron (SEM) and transmission electron (TEM) microscopy, energy-dispersive spectrometer (EDS), the measurement of N2 adsorption-desorption isotherms and Brunauer-Emmett-Teller (BET) surface area, and superconducting quantum interference device (SQJD) magnetometer were adopted to analyze their phase composition, morphology, porosity, and magnetic properties, respectively. The results of controlled experiments show that citrate and polyacrylamide are vital for the phase purities and morphology of ferrites. In particular, the as-obtained samples exhibit a large adsorption capacity for the toxic solution containing As(V) and Cr(VI) ions, and the calculated result of the maximum adsorption capacity is 340 mg/g based on Langmuir model, which shows excellent As(V) and Cr(VI) ions uptake capacity in contrast to other solid nanosphere materials.
机译：与以前的铁氧体（MFe2O4; M = Fe，Co，Zn和Mn）固体纳米球/纳米颗粒通过污染的溶剂热（乙二醇）方法制备的不同，此处可控的单分散多孔铁氧体空心纳米球通过非模板水热法迅速合成。已经引入了一种添加剂，聚丙烯酰胺。可以通过改变合成组成来制备具有不同尺寸的中空纳米球。扫描/透射显微照片显示，铁氧体纳米球的外径为180-380 nm，壳厚度仅为20-45 nm，可以通过控制CH3COONa的浓度进行调节。 X射线衍射（XRD）和X射线光电子（XPS）光谱，扫描电子（SEM）和透射电子（TEM）显微镜，能量分散光谱仪（EDS），N2吸附-解吸等温线和Brunauer-Emmett的测量-Teller（BET）表面积和超导量子干涉仪（SQJD）磁力计分别分析了它们的相组成，形态，孔隙率和磁性能。对照实验结果表明，柠檬酸盐和聚丙烯酰胺对于铁素体的相纯度和形貌至关重要。尤其是，所获得的样品对含有As（V）和Cr（VI）离子的有毒溶液具有较大的吸附容量，根据Langmuir模型，最大吸附容量的计算结果为340 mg / g，这表明与其他固体纳米球材料相比，As（V）和Cr（VI）离子具有出色的吸收能力。

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