Zhang Mao-Jie, Chen Ting, Zhang Ping, Li Zhi-Lu, Chen Li, Su Yao-Yao, Qiu Lian-Di, Peng Gang, Wang Wei, Chu Liang-Yin
College of Engineering, Sichuan Normal University, Chengdu, Sichuan 610101, P. R. China.
Soft Matter. 2020 Mar 11;16(10):2581-2593. doi: 10.1039/c9sm02391g.
A simple and flexible strategy based on droplet microfluidics is developed for controllable fabrication of uniform magnetic SiO2 microparticles with highly-interconnected hierarchical porous structures for enhanced water decontamination. Uniform precursor water droplets containing surfactants and homogenized fine oil droplets with a relatively high volume ratio are generated from microfluidics as templates for microparticle synthesis via hydrolysis/condensation reaction. The SiO2 microparticles possess hierarchical porous structures, containing both mesopores with size of several nanometers, and well-controlled and highly-interconnected macropores with size of hundreds of nanometers. The SiO2 microparticles synergistically integrate fast mass transfer and large functional surface area for enhanced adsorption. To demonstrate the enhanced adsorption performances for organic dyes and toxic heavy metal ions, the microparticles are respectively used for removal of methylene blue in water, and modified with thiol-groups for removal of Pb2+ ions in water. Meanwhile, the microparticles can be easily recycled by magnetic field for reuse.
基于微滴微流控技术，开发了一种简单灵活的策略，用于可控制备具有高度互连分级多孔结构的均匀磁性二氧化硅微粒，以增强水净化效果。通过微流控技术生成含有表面活性剂的均匀前驱体水滴和具有较高体积比的均质细油滴，作为通过水解/缩合反应合成微粒的模板。二氧化硅微粒具有分级多孔结构，包含尺寸为几纳米的中孔以及尺寸为数百纳米的可控且高度互连的大孔。二氧化硅微粒协同整合了快速传质和大功能表面积，以增强吸附作用。为了证明对有机染料和有毒重金属离子的增强吸附性能，分别使用这些微粒去除水中的亚甲基蓝，并用硫醇基团进行修饰以去除水中的Pb2+离子。同时，微粒可通过磁场轻松回收再利用。
