天然黄铁矿对阳离子有机染料RhB吸附特性研究

Adsorption characteristics of cationic organic dye RhB on pyrite

以黄铁矿作为吸附剂研究罗丹明B(Rhodamine B,RhB)的吸附特性,用X射线衍射仪(XRD)、扫描电子显微镜(SEM)对黄铁矿进行了表征。考察了接触时间、溶液pH值、离子强度、温度等对黄铁矿吸附RhB的影响。结果表明,在吸附平衡时间120 min、pH值4.0时,吸附量达到最大值21.3 mg/g。升高温度,黄铁矿对RhB的吸附量逐渐增大。而离子强度对吸附几乎没有影响。实验数据与Langmuir吸附模型拟合良好,整个吸附动力学模型符合准二级吸附动力学模型。热力学研究证实了该吸附过程是自发进行的。通过对吸附反应结束后的黄铁矿进行煅烧处理,去除表面吸附的RhB,结果表明煅烧一次的黄铁矿仍然可以吸附废水中约50%的RhB,具有重复利用的价值。

As an adsorbent,natural pyrite was used to study adsorption characteristics of Rhodamine B （RhB）,which was characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM）.In this study,the factors which affect the adsorption of RhB by pyrite such as reaction time,pH,temperature and ionic strength were investigated.The maximum RhB uptake was 21.3 mg/g,which was observed at the equilibrium time 120 min and pH 4.0.The adsorption capacity of RhB increased gradually with adsorption temperature,while the ionic strength showed little effect on the adsorption process.The adsorption process was well described by the Langmuir isotherm model and the pseudo second-order kinetics model.Thermodynamics results confirmed that the adsorption was a spontaneous process.RhB loaded pyrite was regenerated through calcination in air.The results show that the regenerated pyrite could effectively remove 50 ％ of RhB,demonstrating a strong reuse potential.