Beijing Key Laboratory for Solid Waste Utilization and Management, Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871,China.
Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
J Hazard Mater. 2017 Feb 15;324(Pt B):711-723. doi: 10.1016/j.jhazmat.2016.11.045. Epub 2016 Nov 17.
Two silica gel based adsorbents for Re (VII), i.e. SS-MPTS-VIMH and SS-MPTS-VPQ, were synthesised. Silica gel was used as the matrix for γ-radiation grafting, and the monomer of 1-vinyl imidazole (VIM) and 4-vinylpyridine (4-VP) was grafted onto the silica silanized by methacryloxy propyl trimethoxyl silane, respectively. A VIM concentration of 2molL and an absorbed dose of 30kGy were the optimal grafting conditions for adsorbent SS-MPTS-VIM, and a 4-VP concentration of 4molL and an absorbed dose of 40kGy were the optimal grafting conditions for adsorbent SS-MPTS-VP. At the certain condition, the grafting yield of SS-MPTS-VIM was 30.1% and that of SS-MPTS-VP was 21.0%. The adsorption capacity of adsorbent SS-MPTS-VIMH was 145.99mgg and that of SS-MPTS-VPQ was 71.08mgg according to the Langmuir model. The adsorbent SS-MPTS-VPQ had better adsorption properties of acid resistance and anti-interference than SS-MPTS-VIMH. Dynamic column experiments showed that protonated adsorbent SS-MTPS-VIMH could be recycled with good performance while quaternized adsorbent SS-MPTS-VPQ could not. The adsorbent SS-MPTS-VIMH belongs to weak anion exchange adsorbent and SS-MPTS-VPQ belongs to strong anion exchange adsorbent. This study paves a way to the synthesis and application of a novel silica base adsorbents for Re (VII).
合成了两种用于 Re（VII）的硅胶基吸附剂，即 SS-MPTS-VIMH 和 SS-MPTS-VPQ。硅胶用作γ辐射接枝的基质，单体 1-乙烯基咪唑（VIM）和 4-乙烯基吡啶（4-VP）分别接枝到甲氧基丙基三甲氧基硅烷硅烷化的硅胶上。吸附剂 SS-MPTS-VIM 的最佳接枝条件为 VIM 浓度 2molL 和吸收剂量 30kGy，吸附剂 SS-MPTS-VP 的最佳接枝条件为 4-VP 浓度 4molL 和吸收剂量 40kGy。在一定条件下，SS-MPTS-VIM 的接枝率为 30.1%，SS-MPTS-VP 的接枝率为 21.0%。根据朗缪尔模型，吸附剂 SS-MPTS-VIMH 的吸附容量为 145.99mgg，SS-MPTS-VPQ 的吸附容量为 71.08mgg。与 SS-MPTS-VIMH 相比，吸附剂 SS-MPTS-VPQ 具有更好的耐酸和抗干扰吸附性能。动态柱实验表明，质子化吸附剂 SS-MTPS-VIMH 可以在性能良好的情况下回收，而季铵化吸附剂 SS-MPTS-VPQ 则不能。吸附剂 SS-MPTS-VIMH 属于弱阴离子交换吸附剂，SS-MPTS-VPQ 属于强阴离子交换吸附剂。本研究为合成和应用新型硅胶基 Re（VII）吸附剂开辟了道路。
