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Ren Y.,China West Normal University | Fan G.,China West Normal University | Jiang W.,Key Laboratory of Green Catalysis of Sichuan Institute of High Education | Xu B.,Key Laboratory of Green Catalysis of Sichuan Institute of High Education | Liu F.,Key Laboratory of Green Catalysis of Sichuan Institute of High Education
RSC Advances | Year: 2014

Magnetic palladium/reduced graphene oxide nanocomposites (Pd/rGO-Fe 3O4) were prepared by depositing Pd nanoparticles on an rGO-Fe3O4 magnetic support. The as-prepared nanocomposites were investigated as catalysts for the hydrodechlorination of 4-chlorophenol in the aqueous phase. The complete conversion of 4-chlorophenol (with a concentration as high as 2.5 g L-1) to phenol was obtained in a reaction time of 40 min at room temperature and balloon hydrogen pressure without any additives. The excellent catalytic activity of the Pd/rGO-Fe 3O4 can be attributed to the small particle size of Pd, and an electron-deficient state of Pd in the catalyst as a result of the strong interaction between the active sites and the oxygen of the oxygen-containing groups on the rGO-Fe3O4 support. © 2014 the Partner Organisations. Source


Xu B.,University of Sichuan | Xu B.,Key Laboratory of Green Catalysis of Sichuan Institute of High Education | Jiang W.,University of Sichuan | Jiang W.,Key Laboratory of Green Catalysis of Sichuan Institute of High Education | And 3 more authors.
International Journal of Chemical Kinetics | Year: 2015

Two phenoxo-bridged dinuclear copper(II) complexes (Cu2L1 2 , Cu2L2 2 ) with Nsalicylidene glycine Schiff bases were prepared and evaluated their performance for catalyzing the hydrolysis of p-nitrophenyl picolinate (PNPP). The observations reveal that the as-prepared dinuclear copper(II) complexes exhibited better activity by two to three orders of magnitude rate enhancement in comparison with the autohydrolysis rate of PNPP. Chloro-containing Cu2L2 2 aroused approximately three times kinetic advantage over chloro-free Cu2L1 2 at pH 7.0, which is probably contributed to the electron-withdrawing inductive effect of the 5′ -chloride group. Moreover, it was found that the pH-responded kinetic behavior displayed an enzyme-like property for the PNPP hydrolysis by the two complexes. © 2015 Wiley Periodicals Inc. Source


Jiang W.,Sichuan University of Science & Engineering | Jiang W.,Key Laboratory of Green Catalysis of Sichuan Institute of High Education | Xu B.,Sichuan University of Science & Engineering | Xu B.,Key Laboratory of Green Catalysis of Sichuan Institute of High Education | And 3 more authors.
Colloid and Polymer Science | Year: 2015

Two alkoxo/hydroxide-bridged dinuclear copper(II) complexes (Cu2L1 and Cu2L2) were prepared for evaluating their activity towards the hydrolysis of p-nitrophenyl picolinate (PNPP). Importantly, this work investigated the effects of varied micelles of four surfactants, e.g., cationic gemini 16-2-16 and 16-6-16, single-chain CTAB (hexadecyltrimethylammonium bromide), and LSS (n-lauroylsarcosine sodium), on the PNPP hydrolysis by the as-prepared copper(II) complexes. The experimental results indicate that at neutral pH both of complexes exhibited much better activity by excess four-order of magnitude rate enhancement. For instant, rate constants of PNPP hydrolysis by Cu2L1 and bromo-containing Cu2L2 are approximate 49,569.6- and 31,123.5-fold than that of PNPP spontaneous hydrolysis. In addition, the hydrolytic reactivity of the bromo-containing Cu2L2 is subordinate to that one without bromine, Cu2L1. Moreover, it is found that the micellar solution of gemini 16-6-16 is proved to be the best medium, and whereas LSS micellar solution is the worst one. Particularly, the pKa values of the Cu(II)-bound H2O are determined by a new methodology which is correlative to second derivatives. © 2015, Springer-Verlag Berlin Heidelberg. Source


Jiang W.,University of Sichuan | Jiang W.,Key Laboratory of Green Catalysis of Sichuan Institute of High Education | Xu B.,University of Sichuan | Xu B.,Key Laboratory of Green Catalysis of Sichuan Institute of High Education | And 5 more authors.
Colloid and Polymer Science | Year: 2014

One new hydroxyl-functionalized imidazole derivative (L) was synthesized and characterized. Further, the related mononuclear zinc(II) and cobalt(II) complexes were prepared and used as mimic hydrolases to catalyze the hydrolytic cleavage of p-nitrophenyl picolinate (PNPP) in buffered aqueous solution and a micellar solution of cetyltrimethylammonium bromide (CTAB). Observations show that for all of catalytic systems, the hydrolysis of PNPP was pH-dependent in the pH range of 7.00-8.20. Besides, hydrolysis rates of PNPP displayed a constant increase with the increasing concentration of substrate. In the case of CoL-containing system, moreover, much greater acceleration for PNPP hydrolysis was observed in comparison with the ZnL-containing system. However, micellar effect of CTAB micelle aggregates on the PNPP hydrolysis was not obvious only showing 1.0∼1.3 folds rate difference in contrast to buffered aqueous solution. © 2014 Springer-Verlag. Source


Jiang W.,University of Sichuan | Jiang W.,Key Laboratory of Green Catalysis of Sichuan Institute of High Education | Xu B.,University of Sichuan | Xu B.,Key Laboratory of Green Catalysis of Sichuan Institute of High Education | And 5 more authors.
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2015

Two novel phenoxo-bridged homobinuclear copper(II) complexeswith L-threonine Schiff bases as artificial hydrolases were prepared and screened for catalytic activity in the hydrolysis of p-nitrophenyl picolinate (PNPP), a classic model of carboxylic acid esters. Kinetic analysis testified that the two complexes exhibited good activity with rate acceleration of two orders of magnitude in aqueous solution. In addition, the one copper(II) complex containing 5'-bromo substituent was much more efficient than its bromo-free analogue, showing approximately 1.1̃5.3 times kinetic advantage over a phrange of 7.00-8.20. © Taylor & Francis Group, LLC. Source

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