纳米铁炭复合材料的制备及硝酸盐去除效果的研究

PREPARATION OF NANOMETER IRON CARBON COMPOSITES AND RESEARCH ON ITS NITRATE REMOVAL EFFICIENCY

采用液相还原法制备纳米铁炭颗粒,探讨制备过程中搅拌速率、硼氢化钠的投加速率、加炭时间、炭铁比的影响,并对材料进行TEM、SEM、XRD、XPS表征。结果表明:制备的材料为纳米铁炭复合材料,复合材料孔隙多,比较松散,纳米铁颗粒为椭球形,能负载在层状的活性炭上,活性炭能缓解部分纳米铁颗粒的团聚现象;在炭铁比为0.4,硼氢化钠投加速率为20 m L/min,加炭时间为10 min,搅拌速率为500 r/min的最优条件下制备得到的材料,其对硝酸盐氮的去除率为94.3%。

Nano iron-carbon particles were prepared by liquid phase reduction method. The paper explored the impact of the stirring speed,feed rate of sodium borohydride,feeding time of carbon,and the iron-carbon ratio during preparation process.The materials were characterized by TEM,SEM,XRD and XPS. The results showed that composite materials had porosity and were loose; ellipsoidal iron nanoparticles could be supported on a layer of activated charcoal; activated carbon could alleviate the agglomeration of the iron nanoparticles. The optimal conditions was the iron-carbon ratio of 0. 4,feeding rate of 20 m L / min with sodium borohydride,charcoal time of 10 min,and stirring speed of 500 r / min. The removal efficiency of the nitrate nitrogen was 94. 3% by the composite materials.