天然氧化铁矿物对铅离子的吸附研究

Character of Pb^(2+) absorption on natural iron-(hydr)oxide minerals

通过对铅离子在天然铁的(氢)氧化矿物吸附行为的研究,总结了它们的吸附特征。(1)不同种类的铁(氢)氧化矿物的吸附能力明显不同,针铁矿的吸附能力最强,赤铁矿吸附能力变化最大。对于同种矿物,矿物中杂质的种类和含量是影响吸附能力的主要因素,矿物的晶体习性有一定的影响。(2)粒度较大(>140目)的情况下,天然矿物的粒度对矿物吸附能力的影响呈无规律性地变化。(3)pH值对铁氧化物矿物的吸附性能影响最大。(4)初始浓度越大,氧化铁矿物的吸附量也越大,但吸附率变化复杂且没有规律性。(5)Freundlich等温吸附式较为符合铁氧化矿物的吸附行为。

This paper tries to study the absorption behavior of copper (Ⅱ) on natural iron-(hydr)oxide minerals, and the characters are summarized as follows. (1) Different minerals clearly have different absorption abilities. To the same kind mineral, kinds and contents of impurity are the main effect factors to absorption ability, and the crystal habit affects its absorption ability slightly. (2) The effect of mineral size on absorption ability changes irregularly when the size is larger than 140 mesh. (3) pH affects absorption ability dramatically. (4) The absorption amount is correlated with initial concentration of copper (Ⅱ) positively. (5) The absorb behavior of copper (Ⅱ) on natural iron-(hydr)oxide minerals is apparent agreement with Freundlich iso-temperature absorption.