Detection and adsorption of Hg2+ by new mesoporous silica and membrane material grafted with a chemodosimeter
作者:Qi Zou、Lei Zou、He Tian
DOI:10.1039/c1jm11704a
日期:——
A novel organic–inorganic silica material (MCM-3T), prepared by covalent immobilization of the 2,1,3-benzothiadiazole-based chemodosimeter 3 and thiol group to the mesoporous silica material (MCM-48 type), was characterized by several spectroscopic methods. The MCM-3T shows excellent optical properties with a detection limit of ca. 8.0 × 10−6 M under optimized conditions and exclusively distinguishes the Hg2+ ion from other metal ions in aqueous solution. The MCM-3T can detect Hg2+ ion in a large pH range from 5.0 to 11.0, indicating its convenience for practical application. The MCM-3T is also an outstanding adsorbent for the removal of Hg2+ ion from aqueous solution. The adsorption process of Hg2+ ion on the MCM-3T is well described by the Freundlich isotherm equation and the equilibrium adsorption capacity is 234.88 mg g−1. Furthermore, a new multifunctional silica membrane was synthesized on an alumina ceramic tube and characterized by SEM. The color and emission color of the membrane changed obviously and 90.7% of Hg2+ ion relative to the initial feed was removed after aqueous Hg2+ ion solution permeated through the membrane. This simple synthetic strategy, the economical starting materials, and the considerable signal changes exhibit a promising application of the MCM-3T and multifunctional silica membrane for the simultaneous detection and separation of Hg2+ ion in environmental and industrial fields.
通过共价固定 2,1,3-苯并噻二唑基化学计量器 3 和硫醇基团到介孔二氧化硅材料(MCM-48 型)上,制备了一种新型有机-无机二氧化硅材料(MCM-3T),并通过多种光谱方法对其进行了表征。MCM-3T 显示出优异的光学特性,在优化条件下的检测限约为 8.0 × 10-6 M,可将水溶液中的 Hg2+ 离子与其他金属离子完全区分开来。MCM-3T 可在 5.0 至 11.0 的较大 pH 值范围内检测 Hg2+ 离子,这表明它便于实际应用。MCM-3T 还是一种从水溶液中去除 Hg2+ 离子的出色吸附剂。Hg2+ 离子在 MCM-3T 上的吸附过程可以用 Freundlich 等温线方程很好地描述,平衡吸附容量为 234.88 mg g-1。此外,还在氧化铝陶瓷管上合成了一种新型多功能二氧化硅膜,并用扫描电镜对其进行了表征。膜的颜色和发射色发生了明显变化,Hg2+ 离子水溶液透过膜后,相对于初始进样,90.7% 的 Hg2+ 离子被去除。这种简单的合成策略、经济的起始材料和显著的信号变化表明,MCM-3T 和多功能二氧化硅膜在环境和工业领域同时检测和分离 Hg2+ 离子方面具有广阔的应用前景。