Adsorption of copper on tri-amino-functionalized mesoporous delta manganese dioxide from aqueous solution

作者：Zhai, Yujia; Xu, Xueying; Wang, Hongjie^*; Shi, Xue; Lei, Di

来源：Water Science and Technology, 2015, 71(5): 747-753.

DOI：10.2166/wst.2015.020

• adsorption
• amino-functionalization
• heavy metals
• manganese dioxide

A novel adsorbent, named tri-amino-functionalized mesoporous delta manganese dioxide (NNN-MnO2), was synthesized by bonding trimethoxysilyl propyl diethylenetriamine onto the surface of delta manganese dioxide (delta-MnO2) and used as a Cu(II) adsorbent in aqueous solution. The graft of silane coupling agent onto delta-MnO2 was verified by Fourier transform infrared spectroscopy. The crystalline structure of the adsorbents was indicated by an X-ray powder diffractometer. The specific surface area, pore volume, and Barrett-Joyner-Halenda pore diameter of the NNN-MnO2 were 93.50 m(2) g(-1), 0.31 cm(3) g(-1), and 13.12 nm, respectively. The Elovich equation described well the Cu(II) adsorbing process and the negative values of Delta G and the positive values of Delta H and Delta S indicated a spontaneous and endothermic process. The Langmuir equation fitted well the adsorption isotherm at 298 K and the maximum adsorption capacity of NNN-MnO2 for Cu(II) at pH 4 was 87.72 mg g(-1), which was higher than that of the un-functionalized delta-MnO2 (66.67 mg g(-1)). The graft of tri-amino-functional groups enhanced the uptake of Cu(II), and NNN-MnO2 was a promising candidate for Cu(II) removal from aqueous solution.

• 出版日期2015
• 单位北京林业大学