摘要
采用新型金属有机骨架化合物(MOFs)UiO-66(Zr)为吸附剂,研究吸附时间、吸附温度、溶液pH对As^(3+)吸附效果的影响,并通过吸附等温线和吸附动力学的研究建立As^(3+)的吸附动力学模型。结果表明:溶液的pH值在比较宽的范围,UiO-66(Zr)新型材料对As^(3+)有较高的吸收率,最佳pH值为6.0;初始浓度在10~60μg/L时,UiO-66(Zr)表现出优异的吸附性能,吸附率均达到99%左右。通过吸附等温线和吸附动力学的研究,UiO-66(Zr)新型材料对As^(3+)的吸附过程在热力学上较符合Langmuir模型,属于单分子层吸附;同时,准二级动力学模型能很好地拟合吸附过程(R^2=1.000)。因此,UiO-66(Zr)新型材料可作为As^(3+)吸附、分离和富集的良好吸附剂。
In the present study,A new type metal organic framework（MOFs）UiO-66（Zr）was used as the adsorbent to study the influence on adsorption of As^（3＋）,including the adsorption time,temperature,and solution pH,and an adsorption kinetics model of As^（3＋） was established through the researches on adsorption isotherm and adsorption kinetics.Our results showed that the new material UiO-66（Zr）has a high absorptivity for As^（3＋） in wide-scope pH value solutions and the best pH value is 6.0.Excellent adsorptive property was found when using the solutions with the initial concentration ranging from 10 to 60μg/L,and the UiO-66（Zr）adsorption rate can reach to about 99%.Researchs on adsorption isotherm and adsorption kinetics showed that the adsorption process of new material UiO-66（Zr）for As^（3＋） was consistent well with the Langmuir model in thermodynamics,a monolayer adsorption one.Meanwhile,pseudosecond order kinetic model could fit the adsorption process（R^2=1.000）very well.Thus,we supposed that the new material UiO-66（Zr）might be used as a good adsorbent for As^（3＋） adsorption,separation and enrichment.
出处
《食品与机械》
CSCD
北大核心
2016年第6期61-67,共7页
Food and Machinery
基金
亚热带特色农产品保鲜加工与安全控制技术创新研究(编号:612014042)
