纳米羟基磷灰石纳米管的一种简便制备方法及其对溶液中重金属离子的吸附  

A Facile Method to Prepare Hydroxyapatite Nanotubes and Immobilization Activities Against Heavy Metal Ions in Solutions

作　　者：邹雪艳[1,2] 赵彦保 张治军[1,2,4] ZOU Xue-Yan;ZHAO Yan-Bao;ZHANG Zhi-Jun(Engineering Research Center for Nanomaterials,Henan University,Kaifeng,Henan 475004,China;Key Laboratory for Monitor and Remediation of Heavy Metal Polluted Soils of Henan Province,Jiyuan,Henan 459000,China;National&Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials,Henan University,Kaifeng,Henan 475004,China;Collaborative Innovation Center of Nano Functional Materials and Applications of Henan Province,Henan University,Kaifeng,Henan 475004,China)

机构地区：[1]河南大学纳米材料工程研究中心,开封475004 [2]河南省土壤重金属污染监测与修复重点实验室,济源459000 [3]河南大学纳米杂化材料应用技术国家地方联合工程研究中心,开封475004 [4]纳米功能材料及其应用河南省协同创新中心,开封475004

出　　处：《无机化学学报》2020年第4期747-754,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21571051);河南省重大科技专项(No.181100310600);河南大学一流学科交叉学科建设计划(No.2019YLXKJC04);河南大学科研基金项目(No.2015YBZR032);国家重点研发计划(No.2019YFC1803600)资助。

摘　　要：采用简便的方法合成了20~40 nm长、56 m^2·g^-1的比表面积的羟基磷灰石纳米管(HAP)。然后用制备的HAP纳米管在水溶液中同时吸附Pb^2+、Cd^2+、Cu^2+、Co^2+、Ni^2+、Zn^2+和Hg^2+,其具有高的吸附能力,并能实现快速去除。此外,制备的HAP纳米管对7种重金属离子的脱附率均小于1%,表现出较强的稳定性。实验数据采用Langmuir等温线模型和Freundlich等温线模型进行分析。2个方程的应用结果表明,吸附平衡最适合Langmuir模型,单层饱和吸附能力为958.28 mg·g^-1,具有较好的吸附性能。通过能量色散X射线光谱(EDS)和X射线衍射(XRD)图进一步研究了吸附机理,结果表明,当溶液中Pb^2+离子数量足够时,吸附机理为Pb取代了HAP中的Ca,形成了更稳定的Pb5(PO4)3(OH)。上述实验研究预测了利用HAP纳米管处理含铅废水在环境污染治理中的可行性。Hydroxyapatite nanotubes(HAP NTs)were synthesized by a facile method,which were 20~40 nm in length and had a large surface area of 56 m^2·g^-1.Then the prepared HAP NTs were employed to immobilize Pb^2+,Cd^2+,Cu^2+,Co^2+,Ni^2+,Zn^2+,and Hg2+in aqueous solution and the as-prepared HAP NTs showed a high immobilization capacity.In addition,the desorption rate of the prepared HAP NTs on seven heavy metal ions were all less than 1%,which showed a strong stability.The experimental data was analyzed by the Langmuir and Freundlich isotherm models.The obtained results from the application of the two equations showed that the adsorption equilibrium was best fitted with a Langmuir model and monolayer adsorption capacity was 958.28 mg·g^-1,which showed a perfect immobilization property.The adsorption mechanisms were further studied by energy dispersive X-ray spectrum(EDS)and X-ray diffraction(XRD)patterns and the results showed that the adsorption mechanism was the dissolution of HAP NTs and the precipitation of a more stable Pb5(PO4)3(OH)when the amount of Pb^2+ions in solution was sufficient.Our study confirmed the possibilities of using HAP NTs to treat Pb-contaminated wastewater in the environmental pollution management.

关 键 词：羟基磷灰石 纳米管 吸附 机理 重金属离子 环境化学 水热合成 

分 类 号：O613[理学—无机化学] O647.3[理学—化学]