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以膨胀石墨为载体材料,采用改进后的综合法制备的羟基氧化铁(FeOOH)为改性材料,在酸性及超声波振荡的条件下对膨胀石墨进行表面接枝,制得羟基氧化铁/膨胀石墨复合材料,并对材料进行扫描电子显微镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)表征,随后测试了其除砷性能,并探讨了反应机理.实验结果表明,复合材料中羟基氧化铁通过氢键与化学键均匀负载在了膨胀石墨表面,为亚微米级球状;使用0.5 g复合材料处理50 mL浓度为0.5 mg/L的模拟含砷废水,90 min后去除率可达到99%,且经过处理可以使废水中的砷浓度达到饮用标准;载铁量越高,材料的除砷性能越好,当载铁量达到55%时,使用0.5 g复合材料处理50 mL浓度为2.0 mg/L的模拟含砷废水,1 h后去除率达到72.6%,是普通膨胀石墨的3倍;该除砷过程由解离的羟基氧化铁与砷在复合材料附近完成,符合二级动力学方程和Temkin等温吸附模型.
Using expanded graphite as a carrier material, the modified iron oxide (FeOOH) prepared by the improved synthesis method was used as a modified material to surface-expand the expanded graphite under the condition of acidity and ultrasonic oscillation to obtain the iron oxyhydroxide / expanded graphite Composites. The materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) The reaction mechanism was discussed.The experimental results showed that the FeO 2 was uniformly loaded on the surface of the expanded graphite by hydrogen bonding and chemical bonding and was submicron-spherical.The composite with 0.5 g 0.5 mL / The removal rate of arsenic-containing wastewater can reach 99% after 90 min, and the concentration of arsenic in the wastewater can reach the drinking standard after being treated; the higher the amount of iron is, the better the arsenic removal performance is. When the amount of iron is 55% , 0.5 mL of composite material was used to treat 50 mL of simulated arsenic-containing wastewater at a concentration of 2.0 mg / L. After 1 h, the removal rate reached 72.6%, which was three times of that of ordinary expanded graphite. The arsenic removal process consisted of dissociated iron oxyhydroxide and Arsenic is completed near the composite, in line Order kinetic equation and Temkin adsorption isotherm model.