Adsorption of copper by aminopropyl functionalized mesoporous delta manganese dioxide from aqueous solution

作者：Zhang, Hao; Xu, Meng; Wang, Hong-jie^*; Lei, Di; Qu, Dan; Zhai, Yu-jia

来源：Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2013, 435: 78-84.

DOI：10.1016/j.colsurfa.2012.12.037

• Adsorption
• Heavy metals
• Mesoporous materials
• Manganese dioxide
• Organic silane

A novel adsorbent, named aminopropyl functionalized mesoporous delta manganese dioxide (NH2-MnO2), was synthesized by bounding 3-aminopropyltrimethoxysilane (APTMS) onto delta manganese dioxide (delta-MnO2)surface and used as Cu(II) adsorbent in aqueous solution. The Fourier transform infrared spectroscopy (FT-IR) results verified the grafting of APTMS onto delta-MnO2. The amount of APTMS grafted onto delta-MnO2 was found to be 1.640 mmol g(-1) by thermo gravimetric analysis (TGA). X-ray powder diffraction (XRD) indicated the poorly-crystalline structure of the adsorbents. The specific surface area, pore volume and Barrett-Joyner-Halenda (BJH) pore diameter of the NH2-MnO2 were 79.31 m(2) g(-1), 0.19 cm(3) g(-1) and 9.52 nm, respectively. The adsorption isotherm at 298K could be well described by Langmuir isotherm equation. The maximum adsorption capacity of NH2-MnO2 for Cu(II) at pH 4.0 was 1.543 mmol g(-1), which was higher than that of the un-functionalized delta-MnO2 (1.220 mmol g(-1)). The Elovich equation fitted well for the Cu(II) adsorbing process by NH2-MnO2. The process of aminopropyl functionalization enhanced the adsorbing capability of NH2-MnO2 for Cu(II).

• 出版日期2013-10-20
• 单位河北科技大学; 北京林业大学