二氧化硅接枝杨梅单宁用于水体中Cu^(2+)的吸附去除

Adsorptive Removal of Cu^(2+) in Aqueous Solutions Using Silica Grafted with Bayberry Tannin

采用微乳法制备了氨基化二氧化硅(NH2-SiO2),并通过Mannich反应将杨梅单宁(bayberry tannin)接枝到氨基化二氧化硅表面制备了一种新型的吸附剂,即二氧化硅接枝杨梅单宁(SiO2-BT)。对SiO2-BT吸附剂进行了红外光谱(FTIR)和X射线光电子能谱(XPS)分析,并系统的研究了该吸附剂对水溶液中Cu2+的吸附特性,包括pH的影响?吸附动力学?吸附等温线?共存离子的影响和解吸性能。结果表明:SiO2-BT能有效去除水溶液中的Cu2+,30℃时平衡吸附容量达到28.1 mg/g,且随着温度的升高吸附容量增大。SiO2-BT对Cu2+的吸附动力学符合拟一级速率方程,吸附平衡符合Langmuir方程。此外,SiO2-BT对Cu2+的吸附具有吸附速率快?吸附容量大且易于解吸的特点,可用于水体中Cu2+的吸附去除。

Aminated silica beads(NH2-SiO2) were prepared using microemulsion method,and then grafted with bayberry tannin through the Mannich reaction to prepare a novel adsorbent,namely silica grafted with bayberry tannin(SiO2-BT).The obtained adsorbent was characterized by Fourier Transform Infrared spectrometry(FTIR) and X-ray Photoelectron Spectroscopy(XPS).Furthermore,the adsorption behaviors of Cu2+ on SiO2-BT were systematically investigated,including pH effect,kinetics,isothermals,co-existing ions effect and d...