Treatment of oily wastewaters using magnetic Janus nanoparticles of asymmetric surface wettability

He，Xiao1; Liu，Qingxia1; Xu，Zhenghe1,2

2020-05-15

10.1016/j.jcis.2020.02.019

JOURNAL OF COLLOID AND INTERFACE SCIENCE   影响因子和分区

0021-9797

1095-7103

Hypothesis: Interfacially active magnetic Janus nanoparticles (M-Janus NPs) of asymmetric surface wettability are more interfacially active than biwettable nanoparticles (M-CMC-EC NPs) of uniform surface wettability as such that they could anchor more securely at an oil-water interface to separate emulsified oil droplets from oily wastewaters more effectively by magnetic separation. Experiments: Interfacial tension and interfacial pressure-area isotherms of M-Janus NPs at oil-water interface were measured and the results were correlated to coalescence time of oil droplets determined in various types of aqueous phase (wastewaters) and to the performance of oil removal or recovery from corresponding oily wastewaters by M-Janus NPs and M-CMC-EC NPs of uniform surface wettability by an external magnetic field. Findings: Despite the presence of natural/synthetic surfactants in the oily wastewaters, M-Janus NPs exhibited stronger interfacial activities and anchored more firmly at oil-water interfaces than M-CMC-EC NPs of uniform surface wettability. The application of M-Janus NPs could remove/recover >91.5% oil from oily wastewaters by an external magnetic field as compared with >84.3% achieved by M-CMC-EC NPs of uniform surface wettability for treating different oily wastewaters. The M-Janus NPs could be facilely recycled and efficiently reused in the subsequent applications to oil removal/recovery without complex regeneration.

Asymmetric/uniform surface wettability Magnetic Janus nanoparticles Oil removal/recovery Oily wastewaters

EI ; SCI

英语

通讯

Natural Sciences and Engineering Research Council of Canada[] ; National Natural Science Foundation of China[21938003] ; Leading Talents Program of Guangdong Province[K17253301]

Chemistry

Chemistry, Physical

WOS:000525878000022

Academic Press Inc.

20200908214033

Drops ; Emulsification ; Magnetic separation ; Phase interfaces ; Wastewater treatment ; Wetting

Industrial Wastes Treatment and Disposal:452.4 ; Physical Chemistry:801.4 ; Chemical Operations:802.3

CHEMISTRY

2-s2.0-85079862448

Scopus

1.Department of Chemical and Materials Engineering,University of Alberta,Edmonton,T6G 1H9,Canada
2.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

He，Xiao,Liu，Qingxia,Xu，Zhenghe. Treatment of oily wastewaters using magnetic Janus nanoparticles of asymmetric surface wettability[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2020,568:207-220.

He，Xiao,Liu，Qingxia,&Xu，Zhenghe.(2020).Treatment of oily wastewaters using magnetic Janus nanoparticles of asymmetric surface wettability.JOURNAL OF COLLOID AND INTERFACE SCIENCE,568,207-220.

He，Xiao,et al."Treatment of oily wastewaters using magnetic Janus nanoparticles of asymmetric surface wettability".JOURNAL OF COLLOID AND INTERFACE SCIENCE 568(2020):207-220.