摘要
采用超声水热法制备柠檬酸改性羟基磷灰石(CA-HAP)粉体吸附剂以去除模拟废水中的Cd^(2+),并通过SEM、 X射线衍射(XRD)和傅里叶红外光谱仪(FTIR)对材料形貌、结构进行表征。实验考察了溶液初始pH值、吸附时间、Cd(Ⅱ)初始浓度等因素对CA-HAP吸附废水中Cd(Ⅱ)的影响,并用吸附动力学模型和吸附等温线模型对实验数据进行了拟合。结果表明,以田螺壳为钙源,柠檬酸与氧化钙质量比例为0.055时制得的CA-HAP去除效果最好。CA-HAP在温度为303.15 K时,pH=6.0~7.5、Cd(Ⅱ)模拟废水为30mg/L、吸附时间为60 min时,吸附容量可以达到136.67 mg/g。Langmuir等温吸附模型和准二级动力学模型都能很好地描述Cd(Ⅱ)在CA-HAP吸附剂上的吸附过程。
The citric acid-modified hydroxyapatite(CA-HAP)adsorbent was successfully prepared by ultrasonic-assisted hydrothermal method for the adsorption of Cd^(2+)from simulated wastewater,and the morphology and structure of the material were characterized by SEM,XRD,FTIR.The effects of pH,contact time,initial Cd(Ⅱ)concentration on adsorption performances were studied,and experimental data were fitted using adsorption kinetic models and adsorption isotherm models.The results showed that the best removal efficiency of CA-HAP was achieved when using snail shells as the calcium source and maintaining a citric acid to calcium oxide mass ratio of 0.055.When the temperature was 303.15K,pH=6.0-7.5,the concentration of Cd(Ⅱ)in the simulated wastewater was 30mg/L,and the adsorption time was 60min,and the adsorption capacity could reach 136.67 mg/g.The Langmuir isothermal adsorption model and the pseudo-second-order kinetic model well described the adsorption process of Cd(Ⅱ)on the CA-HAP adsorbent.
作者
曾荣英
刘梦琴
唐文清
Zeng Rongying;Liu Mengqin;Tang Wenqing(College of Chemistry and Materials Science,Hengyang Normal University,Hengyang Hunan 421008,China)
出处
《衡阳师范学院学报》
2025年第6期142-148,共7页
Journal of Hengyang Normal University
基金
湖南省自然科学基金项目(2023JJ60525,2024JJ7068)
湖南省生态环境厅环保科研项目(HBKYXM-2023023)。
