中文摘要：

针铁矿在自然界中广泛存在，对重金属离子在地表的迁移和转化有重要影响。利用天然生物矿化针铁矿进行了Cr（Ⅲ）吸附研究，并利用扫描电子显微镜（SEM）和X射线光电子能谱（XPS）等对吸附后的样品进行表征，发现样品中铬的含量随着Al2O3含量的增加而增加，说明表面带负电荷的含高岭土等的粘土较针铁矿对Cr（Ⅲ）有更强的吸附能力。样品的XPS研究表明，NO3^-也参与了反应，且促进了Cr（Ⅲ）的氧化。研究还发现，Cr（Ⅲ）在针铁矿上的吸附不均匀，与文献报道的情况不同。

英文摘要：

Goethite, which is abundant in nature, has important roles on the mobility and transformation of heavy metals on the earth＇s surface. Adsorption of Cr（Ⅲ）） on biomineralized goethite （BG） was conducted; scanning electron microscope （SEM） and X-ray photoelectron spectroscopy （XPS） were employed for sample characterization. Adsorption of Cr（Ⅲ） on the BG increased with its Al2O3 content, indicating that the negatively charged kaolinite-containing clay constituent of BG had a greater capacity for Cr（Ⅲ） than BG as a whole. The XPS data suggested that NO3 was also involved in the adsorption and that the presence of NO3 might have promoted the oxidization of Cr（Ⅲ）. Contrary to the literature reports, the results show adsorption of chromium on BG was non-uniform.