کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6579819 | 1422937 | 2018 | 31 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ordered mesoporous polymer-carbon composites containing amidoxime groups for uranium removal from aqueous solutions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
Ordered mesoporous polymer-carbon composites containing amidoxime groups (AO-OMC) were successfully synthesized via in-situ polymerizing 2-Butenenitrile onto the external and internal surface of ordered mesoporous carbon (CMK-3). The characterization of small-angle X-ray diffraction, N2 adsorption-desorption isotherms and TEM confirmed that the polyacrylamidoxime was only coated on the mesopore walls with a thin layer rather than occupied the whole pores. The AO-OMC containing 16.8% polyacrylamidoxime (0.2AO-OMC) showed the highest adsorption capacity for U(VI) (322.6â¯mg·gâ1 at pHâ¯=â¯5.0 and Tâ¯=â¯298.15â¯K), which was significantly higher than CMK-3 (43.4â¯mg·gâ1). XPS analysis suggested that the high adsorption capacity of 0.2AO-OMC was mainly attributed to the combination of U(VI) with abundant amidoxime groups via surface complexation and electrostatic interactions. The U(VI) selectivity was above 60% in a wide pH range from 3.0 to 5.0, which has not been reported to date, and reached the highest selectivity of 72.4% at pHâ¯=â¯4.0. The thermodynamic parameters calculated from temperature-dependent adsorption isotherms suggested that uranium adsorption onto 0.2AO-OMC was an endothermic and spontaneous process, and the 0.2AO-OMC exhibited excellent reusability and structural stability without any significant changes in the adsorption capacity after ten cycles. This work highlighted the simple synthesis and application of AO-OMC as an efficient material for the high elimination of U(VI) from large volumes of aqueous solutions in environmental pollution cleanup.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 341, 1 June 2018, Pages 208-217
Journal: Chemical Engineering Journal - Volume 341, 1 June 2018, Pages 208-217
نویسندگان
Zhibin Zhang, Zhimin Dong, Xiangxue Wang, Dai Ying, Fenglei Niu, Xiaohong Cao, Youqun Wang, Rong Hua, Yunhai Liu, Xiangke Wang,