摘要
以铼作为放射性锝的替代元素,用黄铁矿粉末对高铼酸根的还原固定进行了研究。采用球磨法制备出黄铁矿粉末。分别研究了不同固液比、不同的初始p H值和不同粒径条件下,黄铁矿粉末对高铼酸根的还原固定效果。结果显示,固液比为1∶10(g/m L)为宜,在体系初始p H为12时,形成铁氧体,吸附高铼酸根,提升还原固定效果。对产物进行XPS表征,证明还原产物为Re O2。在乙醇介质中机械活化后利用超声分散可得到具有大的比表面积和晶格畸变的粒径较小的黄铁矿粉末,使其反应的活性位点增多,处理效果明显好于大粒径的黄铁矿粉末,在相对较短的时间内,铼的去除率可以达42%。在缺氧环境下黄铁矿能够长期保持有效性,在地质处置库应用中有实际意义。
Technetium was replaced by rhenium in order to study the technetium easily.The pyrite particles were prepared by ball milling method.The major subject of the research was to study the mechanism of reduction and immobilization of perrhenate by pyrite particle.We mainly studied the effect of three factors,different solid-liquid ratio,different initial p H conditions and different particle sizes,on the immobilization of perrhenate.The tests indicate that the solid-liquid ratio of 1∶ 10(g/m L) is suitable.When the initial p H of the system was 12,the iron(hydr) oxides formed,which could adsorb the perrhenate,improve the effect of reduction and immobilization.The reductive production analyzed by XPS was Re O2.Mechanically activated in the ethanol,then ultrasonic dispersed,small pyrite particles with large specific surface area and lattice distortion rate could be obtained,its effect was significantly better than that of large pyrite particles.Using the small pyrite particles could obtain the best result,in the relatively short time,the removal rate was 42%.As natural mineral,pyrite could keep effective for a long time under anaerobic condition,especially used in deep geological disposal repository applications.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第2期627-632,共6页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(41072265
41272375)
太原市科技局大学生创新创业专款(120164075)
山西省回国留学人员科技项目重点资助项目(2013-重点2)
山西省科技重大专项(201311D1028)
关键词
黄铁矿
锝
铼
粒度
PH
pyrite particles
technetium
rhenium
p H
particle
