碳纤维负载零价铁的制备及其去除水溶液中的六价铬

以碳纤维作为载体,采用电沉积法制备碳纤维负载零价铁( PCF-ZVI),利用扫描电镜、能谱仪及X射线衍射仪对其进行了表征,并考察了其对水溶液中Cr(VI)的去除效果.实验结果表明：碳纤维负载零价铁对水溶液中的Cr(VI)具有很好的去除效果.当铁碳质量比为2：1,投加量(以Fe0计)为2 g·L-1,Cr(VI)初始质量浓度为20 mg·L-1,pH值为5,反应时间40 min后,Cr(VI)的去除率可达99.96%,碳纤维上负载的零价铁对Cr(VI)的还原过程为准一级动力学,并且还原速率与反应温度的关系符合Arrhenius定律,反应活化能为20.683 kJ·mol-1.

Preparation of carbon fiber-supported zero-valent iron and their performance in chromium(VI) removal from aqueous solutions

Carbon fiber carrying Fe0 ( PCF-ZVI) was prepared by the electrodeposition method. The carbon fiber carrying Fe0 was characterized by scanning electron microscope/energy dispersive spectroscopy ( SEM/EDS) and X-ray diffraction ( XRD) , and its per-formance was investigated to apply in chromium( VI) removal. It was shown that the carbon fiber carrying Fe0 had good effect on chro-mium(VI) removal in aqueous solutions. The removal efficiency could be up to 99. 96% at the Fe0/C mass ratio of 2:1, the Fe0 dos-age of 2g·L-1, the initial Cr(VI) concentration of 20mg?L-1, pH 5, and the reaction time of 40min. The reaction process was fitted by the pseudo first order reduction kinetics model. The relationship between the rate of reduction and the reaction temperature accorded with the Arrhenius law, and the reaction activation energy was 20. 683 kJ·mol-1 .