Amidoxime-grafted multiwalled carbon nanotubes by plasma techniques for efficient removal of uranium(VI)

作者：Wang, Yun; Gu, Zexing; Yang, Jijun; Liao, Jiali; Yang, Yuanyou; Liu, Ning; Tang, Jun^*

来源：Applied Surface Science, 2014, 320: 10-20.

DOI：10.1016/j.apsusc.2014.08.182

• Plasma
• Amidoxime
• Uranium(VI)
• Carbon nanotubes
• Sorption

A novel solid-phase extractant, amidoxime-grafted multiwalled carbon nanotubes (AO-g-MWCNT5), has been synthesized using plasma techniques to selectively separate uranium from nuclear industrial effluents. The adsorbent was characterized by Fourier transform infrared spectra (FT-IR), elemental analysis, Raman, scanning electron microscopy (SEM), and thermal gravity analysis (TGA). Sorption behaviors of uranium(VI) on AO-g-MWCNTs were investigated by varying pH, contact time, initial uranium concentration, and temperature. An optimum sorption capacity of 145 mg g(-1) (0.61 mmol g(-1)) for U(VI) was obtained at pH 4.5. X-ray photoelectron spectroscopy (XPS) has been used to explore the sorption mechanism of U(VI) on AO-g-MWCNTs. Furthermore, AO-g-MWCNTs could selectively adsorb U(VI) in aqueous solution containing co-existing ions (Mn2+, Co2+, Ba2+ and Cs+). This study shows that AO-g-MWCNTs are potential adsorbent for effective removal of U(VI) from aqueous solution.

• 出版日期2014-11-30
• 单位东华理工大学; 四川大学