Magnetically responsive Janus nanoparticles synthesized using cellulosic materials for enhanced phase separation in oily wastewaters and water-in-crude oil emulsions

He, Xiao1; Liang, Chen1; Liu, Qingxia1; Xu, Zhenghe1,2

2019-12-15

10.1016/j.cej.2019.122045

CHEMICAL ENGINEERING JOURNAL   影响因子和分区

1385-8947

1873-3212

A new class of magnetically responsive and interfacially active Janus (M-Janus) nanoparticles was designed and synthesized by sequential adsorption of cellulosic materials: hydrophobic ethyl cellulose (EC) and hydrophilic carboxymethyl cellulose (CMC) on the opposite sides of magnetite (Fe3O4) nanoparticles. The adsorption study using quartz crystal microbalance with dissipation (QCM-D) proved the concept of proposed synthesis of M-Janus nanoparticles. The adsorption of EC and CMC on magnetite nanoparticles was confirmed by zeta-potential measurements, thermogravimetric analysis (TGA), characterization using Fourier transform infrared spectroscopy (FTIR) and TEM. The surface wettabilities of the opposite sides on the M-Janus nanoparticles were investigated by measuring contact angles of nanoparticle surfaces deposited from the oil-water interfaces using the Langmuir-Blodgett method. SEM images revealed an excellent dispersion of M-Janus nanoparticles in both aqueous and organic phases. The results from the coalescence time and crumpling ratio measurement of particles-stabilized oil droplets along with the interfacial pressure-area isotherms demonstrated stronger interfacial activities of M-Janus nanoparticles and a stiffer interface with adsorbed M-Janus nanoparticles as compared with the interfaces stabilized by conventional interfacially-active nanoparticles. The microscopy images confirmed the deposition of M-Janus nanoparticles at the emulsion droplet surface during the phase separation process. The M-Janus nanoparticles not only exhibited excellent capability and high efficiency in separating emulsified water from water-in-crude oil emulsions and the oil from oily wastewaters under an external magnetic field, but also retained high interfacial activity and hence desirable separation efficiency after five-cycle applications. Because of the environmentally friendly and biodegradable cellulosic materials used in the synthesis, the M-Janus nanoparticle can achieve effective oil/water phase separation without causing further pollution to the continuous phase.

Janus nanoparticles Cellulosic materials Magnetically responsive Oily wastewater Emulsion

SCI ; EI

英语

通讯

National Natural Science Foundation of China[21333005]

Engineering

Engineering, Environmental ; Engineering, Chemical

WOS:000487764800014

ELSEVIER SCIENCE SA

20192807168497

Adsorption ; Cellulose ; Crude oil ; Drops ; Efficiency ; Emulsification ; Emulsions ; Fourier transform infrared spectroscopy ; Iron oxides ; Magnetite ; Magnetite nanoparticles ; Nanomagnetics ; Ostwald ripening ; Phase separation ; Polyethylenes ; Quartz crystal microbalances ; Thermogravimetric analysis

Petroleum Deposits:512.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Magnetic Materials:708.4 ; Chemistry:801 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Organic Polymers:815.1.1 ; Production Engineering:913.1 ; Special Purpose Instruments:943.3

ENGINEERING

Web of Science

1.Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada
2.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

He, Xiao,Liang, Chen,Liu, Qingxia,et al. Magnetically responsive Janus nanoparticles synthesized using cellulosic materials for enhanced phase separation in oily wastewaters and water-in-crude oil emulsions[J]. CHEMICAL ENGINEERING JOURNAL,2019,378.

He, Xiao,Liang, Chen,Liu, Qingxia,&Xu, Zhenghe.(2019).Magnetically responsive Janus nanoparticles synthesized using cellulosic materials for enhanced phase separation in oily wastewaters and water-in-crude oil emulsions.CHEMICAL ENGINEERING JOURNAL,378.

He, Xiao,et al."Magnetically responsive Janus nanoparticles synthesized using cellulosic materials for enhanced phase separation in oily wastewaters and water-in-crude oil emulsions".CHEMICAL ENGINEERING JOURNAL 378(2019).