Pyridine-modified fibrous mesoporous silica microspheres prepared through radiation-induced grafting polymerization and their adsorption property to U(VI)

Chi ZHAO; Hanqin WENG; Mozhen WANG; Xuewu GE; Mingzhang LIN

doi:10.11889/j.1000-3436.2017.rrj.35.050301

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Pyridine-modified fibrous mesoporous silica microspheres prepared through radiation-induced grafting polymerization and their adsorption property to U(VI)

RADIATION CHEMISTRY | 更新时间：2021-12-10

- Pyridine-modified fibrous mesoporous silica microspheres prepared through radiation-induced grafting polymerization and their adsorption property to U(VI)
- Journal of Radiation Research and Radiation Processing Vol. 35, Issue 5, (2017)
- 作者机构：
  
  1.中国科学技术大学核科学技术学院合肥 230027
  2.中国科学院软物质化学重点实验室中国科学技术大学化学与材料科学学院高分子科学与工程系合肥 230026
- 作者简介：
- 基金信息：
  
  the Natural Science Foundation of Anhui Province of China(1708085QA21);China Postdoctoral Science Foundation(2016M592069);the Fundamental Research Funds for the Central Universities(WK2140000009)
- DOI：10.11889/j.1000-3436.2017.rrj.35.050301
  CLC：
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Chi ZHAO, Hanqin WENG, Mozhen WANG, et al. Pyridine-modified fibrous mesoporous silica microspheres prepared through radiation-induced grafting polymerization and their adsorption property to U(VI). [J]. Journal of Radiation Research and Radiation Processing 35(5):050301-9(2017)
DOI：

Chi ZHAO, Hanqin WENG, Mozhen WANG, et al. Pyridine-modified fibrous mesoporous silica microspheres prepared through radiation-induced grafting polymerization and their adsorption property to U(VI). [J]. Journal of Radiation Research and Radiation Processing 35(5):050301-9(2017) DOI： 10.11889/j.1000-3436.2017.rrj.35.050301.

摘要

首先合成了双键改性的纤维状介孔二氧化硅纳米微球（F-SiO,2,-K），将其分散在4-乙烯基吡啶（4-vinylpyridine，4-VP）或4-VP的甲醇溶液中，通过共辐射接枝的方法，制备了吡啶基改性纤维状介孔SiO,2,纳米微球（F-SiO,2,-VP）。热重分析结果表明，聚4-乙烯基吡啶（P（4-VP））在F-SiO,2,微球上的接枝率随4-VP单体浓度和吸收剂量增加而增加，但随剂量率的增加先增大后减小。将F-SiO,2,-VP微球分散在含有U（VI）的硝酸溶液中，测定了室温下微球对U（VI）的吸附容量，并对吸附动力学和吸附等温线进行了分析。结果表明，F-SiO,2,-VP微球对U（VI）的吸附容量与硝酸浓度和P（4-VP）的接枝率有关。当硝酸浓度为5 mol/L，P（4-VP）的接枝率为16%时，对U（VI）的吸附容量最大，达到163 mg/g。该吸附过程符合准二级动力学模型，其吸附热力学则当U（VI）浓度低时符合Freundlich模型，而U（VI）浓度高时符合Langmuir等温吸附模型。

Abstract

In this paper, double-bond-modified fibrous mesoporous silica (F-SiO,2,-K) microspheres were prepared first, and then grafted with poly (4-vinylpyridine) (P(4-VP)) in 4-VP or its methanol solution initiated by γ-ray irradiation to obtain pyridine modified mesoporous silica (F-SiO,2,-VP) microspheres. The Fourier transform infrared spectroscopy (FTIR) and thermal gravimetric analysis (TGA) results indicated the successful grafting of P(4-VP). The degree of grafting (,D,G,) of P(4-VP), which was calculated from TGA curves, increased with the monomer concentration and the absorbed dose, however reached a maximum value at a moderate dose rate. The adsorption ability of F-SiO,2,-VP for U(VI) in nitric acid solution was investigated. The results show that the adsorption capacity is related to the concentration of nitric acid and the ,D,G, of F-SiO,2,-VP, and reaches a maximum of 163 mg/g. The adsorption kinetics fits the pseudo-second-order model, and the adsorption isotherm of F-SiO,2,-VP fits the Freundlich model at low U(VI) concentrations and the Langmuir isotherm well at high U(VI) concentrations.

关键词

γ射线辐射接枝介孔二氧化硅4-乙烯基吡啶U (VI)

Keywords

γ-rayRadiation graftingMesoporous silica4-vinylpyridineUranium

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