膨润土吸附三价铬离子检测方法的研究

Analysis on the trivalent chromium ion adsorbed by bentonite with various detection methods

膨润土作为具有特殊层状结构的黏土矿物材料,具有良好的阳离子交换和吸附特性,是一种潜在的土壤重金属污染天然修复剂。铬是化工等生产中产生的典型重金属污染物,会严重危害土壤种植和人体健康,亟待对铬污染过程及其修复机理进行研究。该文基于传统的分光光度测定法、X射线衍射法(XRD)和电感耦合等离子体质谱法(ICP-MS)等对膨润土吸附三价铬离子进行了实验教学表征研究,并结合新型表征方法太赫兹时域光谱技术对其吸附过程中的影响因子进行较为详细的分析。实验结果表明,膨润土的吸附性能随着吸附剂重量的增加以及吸附质浓度的增高而不断增强。

Bentonite is a clay material with a special layered structure that exhibits superior cation exchange and adsorption properties,and is a potential natural remediation agent for heavy metal pollution in soil.Chromium is a typical heavy metal pollutant produced in chemical production,which will seriously harm soil planting and human health.The adsorption of trivalent chromium ions by bentonite is instructionally characterized by using spectrophotometry,X-ray diffraction(XRD),and inductively coupled plasma mass spectrometry(ICP-MS)methods,and the influencing factors in the adsorption process are analyzed in detail by combining the new characterization method,terahertz time-domain spectroscopy.The experimental results show that the adsorption value of bentonite shows an overall enhancement of adsorption performance with increasing adsorbent weight as well as increasing concentration of the adsorbent mass.