Superfast adsorption-disinfection cryogels decorated with cellulose nanocrystal/zinc oxide nanorod clusters for water-purifying microdevice
作者：Duan-Chao Wang, Hou-Yong Yu, Mei-Li Song, Ren-Tong Yang, and Juming Yao
关键字：cellulose nanocrystal/zinc oxide (CNC/ZnO)
论文来源：期刊
发表时间：2017年
In the outdoor activities and disaster environments, a portable microdevice is very important to rapid purification of field drinking water. Smart cryogels were fabricated by one-pot copolymerization among acrylamide (AM) monomers, 2-(Dimethylamino) ethyl methacrylate (DMAEMA) monomers and cellulose nanocrystal/zinc oxide (CNC/ZnO) nanorod clusters through a simple ice-template method. The effect of nanohybrid contents on microstructure, thermal, swelling and antibacterial properties of cryogels-ZnO were investigated. With the incorporation of 1wt.% CNC/ZnO, the cryogels showed macroporous networked structures with high porosity 93% and homogeneously nanorod clusters on the macroporous wall. Cryogels-ZnO showed high mechanical strength in both dry and wet states, adsorption capacity of 30.8 g/g, superfast adsorption time (2.5s) and stable swelling–deswelling ability after 10 cycles. Besides, the adsorption capacity of cryogels-ZnO presented dual temperature/pH responsive. By treating simulated field water with cryogels-ZnO for 45 minutes, the CFU amounts of simulated field water were decreased from 1862 CFU/mL to 6 CFU/mL. This CFU amount of treated water was very lower than 100 CFU/mL of China''s National Drinking Water Standard. In addition, cryogels-ZnO can effectively handle 14.3-16.1 g/g of disinfected drinking water by manual compression. Such cryogels-ZnO exhibited a great potential for field drinking water-purifying microdevice.