Adhesion-Shielding based synthesis of interfacially active magnetic Janus nanoparticles

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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 (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. 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.

Original languageEnglish
Pages (from-to)1741-1753
Number of pages13
JournalJournal of Colloid and Interface Science
Volume607
DOIs
StatePublished - Feb 2022
Externally publishedYes

Keywords

  • Adhesion-shielding
  • Magnetic Janus nanoparticle
  • Oily wastewater treatment
  • Scalable synthesis
  • Starch powder

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