{Reference Type}: Journal Article
{Title}: Adhesion-Shielding based synthesis of interfacially active magnetic Janus nanoparticles.
{Author}: Yang F;He X;Tan W;Liu G;Yi T;Lu Q;Wei X;Xie H;Long Q;Wang G;Guo C;Pensini E;Lu Z;Liu Q;Xu Z;
{Journal}: J Colloid Interface Sci
{Volume}: 607
{Issue}: 0
{Year}: Feb 2022
{Factor}: 9.965
{DOI}: 10.1016/j.jcis.2021.08.202
{Abstract}: <B>OBJECTIVE: </B>A unique adhesion-shielding (AS)-based method could be used to manufacture magnetic Janus nanoparticles (IM-JNPs) of promising interfacial activities, asymmetric surface wettability, and great performance on deoiling from oily wastewater under the external magnetic field.<BR><B>METHODS: </B>The IM-JNPs were characterized using scanning electron microscope (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and Fourier-transform infrared spectroscopy (FTIR). The interfacial properties of IM-JNPs were investigated by the measurements of interfacial pressure-area isotherms (π-A), oil-water interfacial tension, and the related crumpling ratio. The Langmuir-Blodgett (L-B) technique was used to determine the asymmetric surface wettability of the IM-JNPs. The performance and recyclability of IM-JNPs for treating oily wastewater were also investigated.<BR><B>RESULTS: </B>Using the proposed AS-based method, 17.9 g IM-JNPs were synthesized at a time and exhibited excellent interfacial properties, as indicated by decreasing oil-water interfacial tension from 38 to 27 mN/m. The crumpling behavior of the oil droplet further demonstrated the irreversible deposition of IM-JNPs at the oil droplet surfaces. The L-B technique and water contact angle measurement confirmed the asymmetric surface wettability of the IM-JNPs. The IM-JNPs were applied to successful removal of > 90% emulsified oil droplets from the household-produced oily wastewater under the external magnetic field while realizing facile recyclability and regeneration.