烟末对铀(Ⅵ)的吸附性能

以卷烟生产过程中产生的烟末为原料,进行静态实验,观察烟末用量、溶液的pH、吸附时间、初始浓度及温度等因素对烟末吸附U(Ⅵ)的影响,采用傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、X射线能谱分析(EDS)对烟末进行表征,并探讨其吸附U(Ⅵ)的机理。结果表明:当温度30℃、烟末用量为4g/L、溶液pH=5、U(Ⅵ)浓度为25mg/L、吸附时间为100min时,烟末吸附U(Ⅵ)成效最佳。吸附过程较好的拟合了准二级动力学模型(R2≈1)和Langmuir等温模型(R2≈1)。扫描电镜、X-射线衍射、红外光谱等结果表明,烟末对U(Ⅵ)有很好的吸附性能,其吸附U(Ⅵ)前后使表面形态发生变化,而与U(Ⅵ)互相作用的基团主要是羟基、羧基。

Adsorption performence of Tobacco Scrap to U (VI)

A series of factors,such as dosage of tobacco scrap,the solution pH of solution,the time of adsorption,the original concentration and temperature,influencing adsorption of tobacco scrap to U are investigated by means of static experiment.It takes the tobacco scrap produced during the production of cigarette as ingredient.Besides,this thesis has also adopted the FTIR,SEM and EDS to represent the tobacco scrap and has discussed the mechanism of adsorbing U (Ⅵ).The result has shown that the tobacco scrap has the best adsorption of U (Ⅵ) on condition that the temperature is 30 ℃,the dosage is 4g/L,the? pH of the solution is 5,the concentration of U (Ⅵ) is 25 mg/L and the adsorption time is 100 minutes.The process of adsorption fits the Level 2 Dynamic Model (R2≈ 1) and Langmuir Isotherm Model (R2≈1) better.The results of X-ray diffraction,FTIR,and SEM have shown that the tobacco scrap has a great capability of adsorption to U (Ⅵ),whose adsorption makes the form of its surface change.The groups that interact with U (Ⅵ) are mainly hydroxyl and carboxyl groups.