微纳米黄铁矿对水中Cr(VI)的还原固定研究  

Research on Reduction of Cr(VI) in Water by Micro-nano Pyrite

作　　者：刘普一 丁庆伟[1] 解崇巍 高雨欣 LIU Pu-yi;DING Qing-wei;XIE Chong-wei;GAO Yu-xin(School of Environment and Resources,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学环境与资源学院,太原030024

出　　处：《太原科技大学学报》2024年第5期537-542,共6页Journal of Taiyuan University of Science and Technology

基　　金：山西省重点研发计划项目(201903D121085)。

摘　　要：通过机械活化的方法对天然黄铁矿进行处理,利用X射线衍射仪(XRD)、高分辨率透射电子显微镜(TEM)对其进行表征,采用批实验的方法探究不同投加量、不同温度和不同pH的条件下,黄铁矿微粒对水中Cr(VI)的还原固定效果。结果表明,经过机械活化之后天然黄铁矿粒径在100 nm左右,达到微纳米级别;黄铁矿微粒对水中Cr(VI)的去除率随着投加量的增加不断增大,1.0 g的黄铁矿微粒可以完全去除浓度为10 mg·L^(-1)的Cr(VI)溶液;随着温度的升高,黄铁矿微粒对水中Cr(VI)的去除率升高,温度为45℃、反应时间为2 h,去除率可以达到97.8%;溶液初始pH值在2~7内,黄铁矿微粒对Cr(VI)的去除率随着pH值的升高逐渐降低,pH为2时去除率最高,为95%;通过尝试动力学拟合,黄铁矿微粒去除水中Cr(VI)的过程符合准二级动力学。The micro-nano-scale natural pyrite was prepared by mechanical ball milling activation,and characterized by X-ray diffractometer(XRD)and transmission electron microscope(TEM).The reduction of the materials on Cr(VI)in water was investigated under the conditions of different dosage,temperature and pH.The results show that the removal rate of Cr(VI)in water increases with the increase of the dosage of micro-nano-scale natural pyrite.For Cr(VI)solution with a concentration of 10 mg·L^(-1),1.0 g can be completely removed;With the increase of temperature,the removal rate of Cr(VI)from micro-nano-scale natural pyrite in water increases,and the removal rate can reach 97.8%under the condition of 45℃and reaction time of 2 h;Within the pH range of 2~7,the removal ability of micro-nano-scale natural pyrite to Cr(VI)in water decreases with the increase of the original pH value of the solution.When the pH value is 2,the removal rate is the highest,which is 95%.The pseudo-second-order kinetic equation can better fit the process of removing Cr(VI)from water by micro-nano-scale natural pyrite.

关 键 词：微纳米级黄铁矿 铬Cr(VI) 批实验 动力学 还原固定 

分 类 号：X523[环境科学与工程—环境工程]