摘要
以废弃鸡蛋壳为原料,乙二胺四乙酸二钠(EDTA)为络合物,采用微波液相法合成纳米花状碳羟基磷灰石(CHAP),采用X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)和扫描电镜(SEM)等对粉体相组成和形貌进行分析.将制备的CHAP作为含Cu^2+和Cd^2+废水的吸附剂,考察了pH值、吸附时间、吸附剂用量以及离子的初始浓度对吸附行为的影响.结果表明,采用微波液相法可以快速合成B型取代的花状碳羟基磷灰石.当Cu^2+和Cd^2+初始浓度为50mg·L^-1,吸附剂浓度为分别为3 g·L^-1和2 g·L^-1,pH分别为6和7,吸附时间为70 min,温度为25℃,CHAP对Cu^2+和Cd^2+的吸附率分别达到99%以上.吸附动力学符合拟二级速率方程,吸附类型符合Langmuir等温吸附,Cu^2+和Cd^2+吸附等温线的其相关线性系数分别为R 2=0.9880和R 2=0.9939,饱和吸附量分别为40.98 mg·g^-1和35.59 mg·g^-1.
The domestic hen eggshell waste as raw material has been effectively utilized to produce flower-like carbonate hydroxyapatite(CHAP)by using microwave irradiation liquid-phase method with the help of ethylenedia-minetetraacetic acid(EDTA)as a complex agent.X-ray diffraction(XRD),fourier transform infrared spectroscopy(FTIR),and scanning electron microscope(SEM)were used to analyze the phase composition and morphology of CHAP.The influence of various parameters on adsorption process such as solution pH,contact time,amount of CHAP,and initial concentration of metal ions were studied at 25℃to optimize the conditions for maximum adsorption.The results showed that the flower-like b-type CHAP can be prepared by the microwave-liquid-phase method.The removal efficiency of Cd^2+and Cu^2+by CHAP could reach 94 and 93.17%,respectively,when the initial Cd^2+and Cu^2+concentration was 50 mg·L^-1,the liquid/solid ratio was 3 and 2 g·L^-1,pH values was 6 and 7,and the adsorption time was 70 min.The kinetic equation corresponds to the pseudo second order and the equilibrium sorption data for at 25℃could be described by the Langmuir isotherm models.Their correlation coefficients were 0.9880 and 0.9939,respectively.The highest values of Langmuir uptake were found for copper(40.98 mg·g^-1)and cadmium(35.59 mg·g^-1).
作者
徐娇
刘鹏
XU Jiao;LIU Peng(School of Chemistry and Environmental Science,Qujing Normal University,Qujing Yunnan 655011,P.R.China)
出处
《曲靖师范学院学报》
2020年第6期34-39,共6页
Journal of Qujing Normal University
基金
云南省科技厅青年项目“曲靖地区煤中可溶有机物分离分析及其多环芳烃分布特征研究”(2017FD143)
云南省科技计划项目“UCST型温敏聚合物材料的设计、制备及其性能研究”(2017FH001-048)
云南省2018年大学生创新训练项目“UCST型温敏聚合物改性PAN温控开/关分离膜研究”(201810684014).
