title: Catalytic Emulsion Based on Janus Nanosheets for Ultra-Deep Desulfurization.
abstract: Catalytic Janus nanosheets were synthesized by using an anion-exchange reaction between heteropolyacids (HPAs) and the modified ionic-liquid (IL) moieties of Janus nanosheets. Their morphology and surface properties were characterized by using SEM, energy-dispersive spectroscopy (EDS), FTIR spectroscopy, and X-ray photoelectron spectroscopy (XPS) studies. Because of their inherent Janus structure, the nanosheets exhibited good amphipathic character with ILs and oil to form a stable ILs-in-oil emulsion. Therefore, these Janus nanosheets can be used as both emulsifiers and catalysts to perform emulsive desulfurization. During this process, sulfur-containing compounds at the interface could be easily oxidized and efficiently removed from a model oil. Application of this Janus emulsion brings an efficient, useful, and green procedure to the desulfurization process. Compared with the desulfurization catalyzed by using HPAs in a conventional two-phase system, the sulfur removal of dibenzothiophene (DBT) achieved in a Janus emulsion system was improved from 68 to 97 % within 1.5 h. Moreover, this emulsion system could be demulsified easily by simple centrifugation to recover both the nanosheets and the ILs. Owing to the good structural stability of the Janus nanosheets, the sulfur removal efficiency of DBT could still reach 99.9 % after the catalytic nanosheets had been recycled at least six times.
authors.affiliation: College of Chemistry, Liaoning University, Shenyang, 110036, P.R. China.
authors.forename: Lixin
authors.initials: L
authors.lastname: Xia
authors.affiliation: College of Chemistry, Liaoning University, Shenyang, 110036, P.R. China.
authors.forename: Hairan
authors.initials: H
authors.lastname: Zhang
authors.affiliation: College of Chemistry, Liaoning University, Shenyang, 110036, P.R. China.
authors.forename: Zhichao
authors.initials: Z
authors.lastname: Wei
authors.affiliation: College of Chemistry, Liaoning University, Shenyang, 110036, P.R. China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: College of Chemistry and Life Science, Shenyang Normal University, Shenyang, 110034, P.R. China.
authors.forename: Ling
authors.initials: L
authors.lastname: Zhang
authors.affiliation: College of Chemistry, Liaoning University, Shenyang, 110036, P.R. China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhao
authors.affiliation: College of Chemistry, Liaoning University, Shenyang, 110036, P.R. China.
authors.forename: Junhui
authors.initials: J
authors.lastname: Zhang
authors.affiliation: College of Chemistry, Liaoning University, Shenyang, 110036, P.R. China.
authors.forename: Li
authors.initials: L
authors.lastname: Dong
authors.affiliation: College of Chemistry, Liaoning University, Shenyang, 110036, P.R. China.
authors.forename: Erni
authors.initials: E
authors.lastname: Li
authors.affiliation: Université de Strasbourg, Institut de Chimie, UMR CNRS 7177, Laboratoire O'Electrochimie et de Chimie Physique du Corps Solide, 4 rue Blaise Pascal, CS 90032, 67081, Strasbourg cedex, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Ruhlmann
authors.affiliation: College of Chemistry, Liaoning University, Shenyang, 110036, P.R. China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang
keywords: Janus structures; demulsification; desulfurization; emulsions; microreactors