Controlled bi-functionalization of silica microbeads through grafting of amidoxime/methacrylic acid for Sr(II) enhanced sorption
Controlled bi-functionalization of silica microbeads through grafting of amidoxime/methacrylic acid for Sr(II) enhanced sorption
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通过接枝偕胺肟/甲基丙烯酸控制二氧化硅微珠的双功能化以增强 Sr(II) 的吸附
DOI:
10.1016/j.cej.2020.125220
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发表时间:
2020-12
影响因子:
15.1
通讯作者:
Guibal Eric
中科院分区:
文献类型:
--
作者:
Wei Yuezhou;Rakhatkyzy Makpal;Salih Khalid A. M.;Wang Kaituo;Hamza Mohammed F.;Guibal Eric
Silica microspheres are functionalized through the grafting of either polymethacrylic acid or amidoxime groups (mono-functional composite, PMAA/SiO2and PAO/SiO2, respectively) or in combination (bi-functional composite, PAOxMAA100-x/SiO2). The materials are characterized by textural analysis, TGA, SEM-EDX, elemental analysis, FTIR, XPS, pHPZCin order to confirm the synthesis route, identify the reactive groups and support the interpretation of sorption mechanisms toward Sr(II). The sorption of Sr(II), at optimum pH 8, involves amine groups and hydroxyl/carboxyl groups in the bi-functional composite sorbent. The comparison of sorption properties shows that maximum sorption requires a majority of carboxylic groups from polyacrylic compared with amidoxime functions; optimum formulation: PAO20MAA80/SiO2sorbent. Sorption isotherms are efficiently fitted by the Langmuir and Sips equations: the maximum sorption capacity reaches around 1.38 mmol Sr g−1. Kinetic profiles for sorption are modeled using the pseudo-first order rate equation; equilibrium is achieved within 40–60 min. Complete desorption of Sr(II) using 1 M HCl solutions is even faster; equilibrium time being 15–20 min. The sorbent can be recycled for 5 cycles with a limited decrease in the sorption performance, and full desorption. In fixed-bed column, the breakthrough curves are fitted by the Thomas equation. In multi-component solutions, the sorbent shows a preferred selectivity according the sequence: K(I) > Ba(II) > Na(I) > Ca(II). Tested on seawater, the sorbent shows high distribution ratio for Sr(II), B(III) and Mo(VI)
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DOI:
--
发表时间:
1979
期刊:
--
影响因子:
--
作者:
E. Serjeant;B. Dempsey
通讯作者:
E. Serjeant;B. Dempsey
影响因子:
1.8
作者:
K. Mulani;V. Patil;N. Chavan;K. Donde
通讯作者:
K. Mulani;V. Patil;N. Chavan;K. Donde
影响因子:
1.6
作者:
Tingting Li;Fan He;Yao-dong Dai
通讯作者:
Tingting Li;Fan He;Yao-dong Dai
DOI:
10.1021/la200347u
发表时间:
2011-03
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
作者:
Nicolas Schüwer;H. Klok
通讯作者:
Nicolas Schüwer;H. Klok
影响因子:
1.6
作者:
Zuo Rui;Meng Li;Guan Xin;Wang Jinsheng;Yang Jie;Lin Yuanhui
通讯作者:
Lin Yuanhui