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    Adhesion-Shielding based synthesis of interfacially active magnetic Janus nanoparticles

    Year: 2022

    Journal: J. Colloid Interface Sci., Volume 607, FEB, page 1741–1753

    Authors: Yang, Fan; He, Xiao; Tan, Wen; Liu, Gang; Yi, Tingting; Lu, Qingye; Wei, Xiaoting; Xie, Hanjie; Long, Qiurong; Wang, GuiChao; Guo, Chuanfei; Pensini, Erica; Lu, Zhouguang; Liu, Qingxia; Xu, Zhenghe

    Organizations: National Natural Science Foundation of China [21808101, 21938003]; Shenzhen Research Foundation for Advanced Talents [20200207]; Leading Talents Program of Guangdong Province [K17253301]; Shenzhen Science and Technology Innovation Commission [ZDSYS20200421111401738]

    Keywords: Magnetic Janus nanoparticle; Oily wastewater treatment; Adhesion-shielding; Scalable synthesis; Starch powder

    Hypothesis: 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. Experiments: 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 (p-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. Findings: 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. (c) 2021 Elsevier Inc. All rights reserved.
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