Bland Henry A, Centeleghe Isabella A, Mandal Soumen, Thomas Evan L H, Maillard Jean-Yves, Williams Oliver A
School of Physics and Astronomy, Cardiff University, Queen's Building, The Parade, Cardiff CF24 3AA, United Kingdom.
School of Pharmacy and Pharmaceutical Sciences, Cardiff University, Redwood Building, King Edward VII Avenue, Cardiff CF10 3NB, United Kingdom.
ACS Appl Nano Mater. 2021 Mar 26;4(3):3252-3261. doi: 10.1021/acsanm.1c00439. Epub 2021 Mar 9.
Electropositive membranes demonstrating high flux at low pressure differentials show great promise as universal separation platforms for viruses and other charged entities when centralized systems of water and power are scarce. However, the fabrication of a suitably stable membrane with optimal electrostatic characteristics remains a challenge. Here, hydrogenated detonation nanodiamond was loaded onto a quartz microfiber support membrane and coupled to the membrane surface under a high vacuum annealing process. The fabricated membranes display a zeta potential of +45 mV at pH 7 and an isoelectric point around pH 11. We show that the nanodiamond coating is robust to prolonged periods of pressurized water flow by performing extensive zeta potential measurements over time, and water filtration tests demonstrated excellent membrane retention for the electronegative dye molecule acid black 2, and at least a 6.2 log reduction in MS2 bacteriophage from feed waters (>99.9999%).
在压差较低时具有高通量的正电膜，在水和电力集中供应稀缺的情况下，作为病毒和其他带电实体的通用分离平台显示出巨大潜力。然而，制造具有最佳静电特性的适当稳定的膜仍然是一项挑战。在此，将氢化爆轰纳米金刚石负载到石英微纤维支撑膜上，并在高真空退火过程中与膜表面耦合。所制备的膜在pH 7时的zeta电位为+45 mV，等电点约为pH 11。我们通过长时间进行广泛的zeta电位测量表明，纳米金刚石涂层对长时间的加压水流具有耐受性，并且水过滤测试表明该膜对带负电的染料分子酸性黑2具有优异的截留率，对进水水源中的MS2噬菌体至少有6.2个对数级的减少（>99.9999%）。
