2015年12月，第21卷，第4期，616-622页 December 2015, Vol.21, No.4, Pp.616622
DOI: 10.16108/j.issn10067493.2015207
高
校
学报
地
质
Geological Journal of China Universities
岩去除水中铜离子的效果及其机制
粘土质白云岩去
邱高，谢巧勤，陈天虎，刘海波，谢晶晶，李宏伟，田兮合肥工业大学资源与环境工程学院，纳米矿物与环境材料实验室，合肥230009
摘要：利用静态吸附实验研究了溶液pH值、反应时间、初始Cu~浓度等因素对国凸棒石粘土矿中粘土质白云岩去除Cu"效果的影响，将准一级、准二级、Elovich动力学方程与反应动力学进行拟合，再利用Langmuir、Freundlich等温方程对实验数据进行等温式拟合，并与普通白云岩和凹凸棒石粘土进行了对比研究。结果表明，粘土质白云岩相对于其他两种材料受p 影响较小，且在pH3~5范围内对Cu^去除率均大于85%，最佳pH为5；对Cu"的去除符合准二级动力学模型，粘土质白云岩对铜的去除速率和去除率均最高；
等温数据符合Freundlich模型，对Cu的最大去除量（pH=5，30℃）为186.2x10"。粘
土质白云若去除水中Cu*的主要机制为矿物水化与溶解引起的表面沉淀及凹凸棒石与新生碱式碳酸铜[Cu;CO(OH)]胶体的静云岩和国凸棒石粘土，在处理含Cu*废水方面具有潜在应用价值。
关键词：粘土质白云岩；白云岩；回凸棒石粘土；铜；去除；表面沉淀
中图分类号：X754
文献标识码：A
文章编号：10067493（2015）04061607
PerformanceandMechanismsfortheRemoval of CopperIonsfrom
Aqueous Solutions by Clayey Dolomite
QIU Gao, XIE Qiaoqin, CHEN Tianhu*, LIU Haibo, XIE Jingjing, LI Hongwei, TIAN Yixi Nano Mineral and Environmental Material Labontory, School of Resources and Emvironmental Engineering
Hefei University of Technology, Hefei 230009, China
Abstract: In comparison to common dolomite and palygorskite clay, the effects of parameters such as pH, contact time, initial concentration of copper on removal of copper ions using clayey dolomite in palygorskite clay deposit was investigated using static adsorption experiments, The kineties of copper removal was diseussed by the pseudo-first-order, the pseudo-seeond-order and the Elovich model, and the sorption isotherm was analyzed by Langmuir and Freundllich isotherm equations. The results show that the effect of pH on the removal of copper (Il) ion by clayey dolomite was less than the other two. More than 85% of copper (Il) ions were removed in the pH range of 3 to 5 and the optimum pH is 5. The kinetie data of the removal of copper by clayey dolomite fitted the pseudo-second-order kinetic model very well. The removal rate as well as the efficiency was the highest. The isotherm data can be described by the Freundlich model and the removal capacity was 186.2 × 10-′, The removal mechanisms were mainly surfaoe precipitation induced by the mineral-water interactions and electrostatic attraction between palygorskite and the newly formed colloid[Cu;CO(OH):]. The present study concludes that clayey dolomite is more effective because of the intergrowth of nanoscale palygorskite and sub-micron porous dolomite, leading to the high-efficient removal of copper ions than the common dolomite and palygorskite clay, and it possesses the potential for treating copper wastewater.
Key words: clayey dolomite; dolomite; palygorskite clay; copper; removal; surface precipitation
Corresponding author: CHEN Tianhu, Professor; E-mail: chentianhu168@vip-sina.com 收稿日期：20150520；修国日期：201510-15
基全项目：安微省国土资源厅科技项目（2013-K-08），博土后基金（2014M560504）、安徽省自然科学基金（1508085QD77）联合资助作者篇介：邱高，男，1991年生，硕土研究生，研究方向：环境矿物学；E-mail:geraldehiu@163.com
*通界作者：陈天虎，教授；E-mail:：chentisnhe168@vipsinacom