天然锰矿与铁氧化菌协同除砷性能研究

Study on the removal performance of natural manganese ore and iron-oxidizing bacteria on the arsenic

采用铁氧化菌浸取天然锰矿,利用X射线荧光光谱分析(XRF)、X射线衍射分析(XRD)以及扫描电镜(SEM)对制备出的侵蚀锰矿进行表征,进一步研究侵蚀锰矿的除砷性能及机理。结果表明:侵蚀锰矿对As(Ⅲ)和As(Ⅴ)的饱和吸附量分别为18.52mg/g和19.23 mg/g。Langmuir吸附模式能很好地描述对侵蚀锰矿砷的吸附。对砷的去除率与温度成正相关关系,p H值在中性附近时,侵蚀锰矿的除砷效果最好,共存阳离子(Ca2+、Mg2+)可促进砷的去除。表征分析发现,浸泡前后锰矿主要成分(Mn、Si、Fe、Al)未改变,但Mn O含量较之前下降11.62%,Fe2O3增加13.38%,羟基含量增加,孔隙率增加31.81%,孔隙比增大0.472。

In this study,through the leaching of iron oxidizing bacteria with natural manganese ore,by the using of Xray fluorescence,the X-ray diffraction analysis,and scanning electron microscopy testing technology to characterize the prepared eroded manganese ore,which also gives a further research on the removal performance and mechanism of the eroded manganese ore on the arsenic. The results of the experiment showed that the saturated adsorption capacity of eroded manganese ore on the As（ III） and As（ V） were 18. 52 mg/g and 19. 23 mg/g respectively. The Langmuir adsorption model adsorption gives a good description on the removal of arsenic by the eroded manganese ore. The removal rate of arsenic is positively correlated with temperature,when the p H value is near neutral,the best removal performance of eroded manganese ore on the arsenic can be achieved,and the coexisting cation（ Ca2 ＋、Mg2 ＋） can promote the removal rate of arsenic. With the characterization experiment,it shows that the main components（ Mn,Si,Fe,Al） of manganese ore did not change before and after immersion,but the content of Mn O decreased by 11. 62%,Fe2 O3 increased by 13. 38%,the content of hydroxyl increase,porosity increased by 31. 81%,porosity ratio increased0. 472.