纳米级氧化铁的合成及其对六价铬的吸附性能研究

纳米级氧化铁的合成及其对六价铬的吸附性能研究 Preparation of Nanometer-size Iron Oxide and Its Absorption Test to Chromium Ion （Ⅵ） 喻德忠 YU De-zhong 1 2 first-author 蔡汝秀 CAI Ru-xiu 1 2 潘祖亭 PAN Zu-ting 1 2 武汉大学化学与分子科学学院 武汉大学化学与分子科学学院 College of Chemistry and Molecular Sciences, Wuhan University College of Chemistry and Molecular Sciences, Wuhan University 武汉大学化学与分子科学学院,湖北,武汉,430072 武汉大学化学与分子科学学院,湖北,武汉,430072 采用溶胶-凝胶法合成了纳米氧化铁,研究了合成条件,并采用TEM对产品进行了表征,测得产品的平均粒径为20-30nm.研究了纳米级氧化铁对Cr（Ⅵ）的吸附.在pH=3.0,吸附比为3.5×10-6:1×10-2（g/g）时,平均吸附效率为95.98％,最大吸附量为398.3μg Cr（Ⅵ）/g.采用2mol/LNaOH可完全洗脱纳米氧化铁所吸附的Cr（Ⅵ）,测定了回收后的纳米氧化铁对Cr（Ⅵ）的吸附效率,结果表明纳米级氧化铁可循环使用,这将为环境污水中Cr（Ⅵ）的治理及研究纳米材料的吸附行为提供参考. Nanometer-size iron oxide has been prepared by Sol-Gel process, and powders has been characterized by TEM. The results show that the average grain size is between 20-30 nm. The absorption of nanometer-sized iron oxide to chromium ion（Ⅵ） also has been studied. The results show that the absorption rate is ninety-five percent or more when the rate of iron oxide to chromium is 0. 01g to 3. 5 μg and the pH value is keeping at three, stirring for an hour. The Cr（Ⅵ） can be eluted by 2 mol/L NaOH solution. The absorption of the recovered iron oxide remains very high . The method can be used to solve Cr（Ⅵ） pollution in water and this paper is a reference of studying absorption of nanometer-sized materials. 纳米氧化铁 溶胶-凝胶法 六价铬 TEM表征 吸附 nanometer-sized iron oxide sol-gel process chromium ion （Ⅵ） TEM characterize absorption O647.3 国家自然科学基金资助项目（20075018） 2002-02-01 2021-04-01 2