辐射改性介孔SiO2及其对铼的吸附性能  

Radiation modification of mesoporous SiO_(2) and its adsorption performance for rhenium

作　　者：沈旺来 陈怡志 张鹏 吴志豪 翁汉钦 林铭章[1] SHEN Wanglai;CHEN Yizhi;ZHANG Peng;WU Zhihao;WENG Hanqin;LIN Mingzhang(School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学核科学技术学院,合肥230026

出　　处：《辐射研究与辐射工艺学报》2022年第1期96-105,共10页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金(51803205、11775214)资助。

摘　　要：利用60Coγ辐射接枝合成了聚4-乙烯基吡啶(4-VP)改性的多层次介孔SiO2(FS-VP)微球,并对接枝后的FS-VP进行了季铵化。采用傅里叶变换红外光谱、X射线光电子能谱和热重分析方法研究了接枝率的影响因素和季铵化微球(FS-VPQ)对Re(Ⅶ)的吸附性能。结果表明:在4-VP单体体积分数为50%、吸收剂量为72 kGy、剂量率为3 kGy/h的条件下,FS-VP的接枝率极大值为27.8%;当pH为2和3时,吸附容量极大值为68.0 mg/g,较高的吸附容量得益于多层次孔结构的高比表面积和季铵化后吸附剂固有的两个正电荷;FS-VPQ对Re(Ⅶ)的吸附等温线符合Langmuir模型;此外,由于多层次孔结构带来的高传质速率使FS-VPQ能够在3 min内快速达到吸附平衡。本工作对Re(Ⅶ)分离与富集以及放射性废液中Tc处理具有参考价值。In this study, poly 4-vinylpyridine-modified multilayered mesoporous silica(FS-VP) was synthesized by radiation grafting, and the effects of the synthesis conditions on the grafting ratio were investigated.The results of Fourier transform infrared(FTIR) spectroscopy, X-ray photoelectron spectroscopy(XPS), and thermogravimetric analysis(TGA) indicated that the grafting ratio of FS-VP reached the maximum value of 27.8%under the following conditions: 4-vinylpyridine(4-VP) monomer concentration, 50%;radiation dose rate, 3 kGy/h;and absorbed dose, 72 kGy. In addition, quaternized FS-VP(FS-VPQ) was prepared, and its adsorption performance for Re(Ⅶ) was also studied. The adsorption capacities were the maximum at pH 2 and 3. The adsorption isotherm of FS-VPQ for Re(Ⅶ) conformed to the Langmuir model. The saturated adsorption capacity reached 68.0 mg/g at pH 3. The high adsorption capacity was attributed to the high specific surface area of the multilayered pore structure and the two inherent positive charges of the adsorbent after quaternization. Moreover, due to the high mass transfer rate resulting from the multilayered pore structure, FS-VPQ reached adsorption equilibrium within 3 min. The findings of this study provide theoretical guidance for Re separation and enrichment technology, and also can serve as reference for the separation of Tc from radioactive waste liquids.

关 键 词：多层介孔SiO_(2) 辐射接枝 季铵化改性 吸附 锝(铼) 

分 类 号：TL13[核科学技术—核能科学]