期刊文献+

辛基羟肟酸在氟碳铈矿表面的吸附机理 预览

Adsorption mechanism of octyl hydroxamic acid on bastnaesite surface
在线阅读 下载PDF
收藏 分享 导出
摘要 通过吸附量测试、纯矿物浮选、Zeta电位和 XPS测试,研究辛基羟肟酸在氟碳铈矿表面的吸附行为和吸附机理。研究结果表明:辛基羟肟酸在氟碳铈矿表面吸附符合二级动力学模型,等温吸附过程符合 Freundlich吸附模型,pH=9.5时辛基羟肟酸在氟碳铈矿表面的吸附速度和吸附量比 pH=6.5时的大;辛基羟肟酸在氟碳铈矿表面的吸附为多层、不均匀吸附,是物理吸附和化学吸附共同作用的结果,但以化学吸附为主。吸附机理为:羟肟酸根阴离子OHA^-与氟碳铈矿表面暴露的Ce^3+发生螯合反应生成OHA-Ce沉淀,形成化学吸附;羟肟酸分子OHA与氟碳铈矿表面的氧以氢键形式形成物理吸附,同时,溶液中游离的羟肟酸分子 OHA与氟碳铈矿表面已吸附上的OHA分子形成氢键和烃链间疏水缔合作用,产生不均匀的物理吸附。 The adsorption behavior and mechanism of octyl hydroxamic acid (OHA) on bastnaesite surface was investigated through adsorption test, single mineral flotation, Zeta potential and XPS measurements. The results show that the adsorption of OHA on bastnaesite surface agrees with the second order kinetic model, and the isothermal adsorption process correlates well with the Freundlich isotherm model. The adsorption speed and adsorption amount of OHA on bastnaesite surface at pH=9.5 are greater than that at pH=6.5. The adsorption of OHA on bastnaesite surface is multilayered and heterogeneous, which is a combined result of physical and chemical adsorption, and the later is the dominating form. The adsorption mechanism is that hydroxamate anions OHA^- can chelate react with the exposed Ce^3+ on bastnaesite surface and form the OHA-Ce precipitate, resulting in chemical adsorption. Hydroxamic acid molecule OHA can form hydrogen bond with oxygen atom on bastnaesite surface and form physical adsorption, and meanwhile, the dissociated OHA molecule can form hydrogen bond and hydrophobic association of hydrocarbon chains with the adsorbed OHA on bastnaesite surface, resulting in heterogeneous physical adsorption.
作者 王介良 曹钊 王建英 张雪峰 雷霄 冯宏杰 WANG Jieliang;CAO Zhao;WANG Jianying;ZHANG Xuefeng;LEI Xiao;FENG Hongjie(Institute of Mining Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;Guangdong Institute of Resources Comprehensive Utilization, Guangzhou 510650, China;State Key Laboratory of Rare Metals Separation and Comprehensive Utilization, Guangzhou 510650, China;Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China)
出处 《中南大学学报:自然科学版》 EI CAS CSCD 北大核心 2019年第4期762-770,共9页 Journal of Central South University:Science and Technology
基金 国家自然科学基金资助项目(51764045) 内蒙古自治区科技计划项目(4050901051701) 稀有金属分离与综合利用国家重点实验室开放基金资助项目(GK-201804) 内蒙古高等学校“青年科技英才支持计划”(NJYT-18-B08).
关键词 氟碳铈矿 辛基羟肟酸 吸附 热力学 吸附机理 bastnaesite octyl hydroxamic acid adsorption adsorption thermodynamics adsorption mechanism
作者简介 通信作者:曹钊,博士,副教授,博士生导师,从事复杂多金属矿选矿工艺和理论研究;E-mail:caozhao1217@163.com.
  • 相关文献

参考文献13

二级参考文献149

共引文献291

投稿分析

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈