水铁矿纳米带的低成本合成及其去除Cr(Ⅵ)的研究

LOW-COST SYNTHESIS OF FERRIHYDRITE NANORIBBONS FOR Cr(Ⅵ) REMOVAL

纳米粒级的铁氧化物因其具有高比表面积,在去除水中重金属时表现出优异的性能。采用水相合成的方法,以氢氧化镁硫酸盐水合物纳米带(MHSH)为模板,用低成本的方式首次获得了水铁矿结构的铁氧化物纳米带。水铁矿纳米带的宽度为50~200 nm,厚度为10~50 nm,长度从几微米到几十微米。水铁矿纳米带的BET比表面积为45.23 m^2/g。研究发现:水铁矿纳米带的Zeta电位零点出现在pH=8左右。且当溶液pH值为4时,水铁矿纳米带对水中Cr(Ⅵ)的吸附容量最大,可达47.17 mg/g。

Due to the high surface area,the ferrous compounds showed excellent ability in removing heavy metal ions from water. Using magnesium hydroxide sulfate hydrate nanoribbons as the templates,ferrihydrite nanoribbons were successfully synthesized with low cost via the water-phase approach. These nanoribbons had lengths from several micrometres to tens of micrometres,widths of 50 ~ 300 nm,and thicknesses of 10 ~ 50 nm. The BET surface area of ferrihydrite nanoribbons was calculated to be as large as 45. 23 m2/ g. When the pH value of water solution was at 4,the maximum absorption capacity of ferrihydrite nanoribbons for Cr（ Ⅵ） could be up to 47. 17 mg / g。