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Hydrolysis kinetics of p-nitrophenylpicolinate catalyzed by schiff base Mn(III) complexes in Gemini 16-2-16 micellar solutiony

100%

Xu B., Jiang W., Zhang J., Fan G., Li J.

Open Chemistry

2009

vol. 7

issue 3

542-549

Two mono-Schiff base Mn(III) complexes (MnL2Cl, L=L1 and L2) were synthesized and employed as artificial hydrolases in catalyzing the hydrolysis of p-nitrophenylpicolinate (PNPP) in Gemini 16-2-16 micellar solution. The effect of different micelles and their complex structures on the catalytic hydrolysis of PNPP is discussed in detail. The observations showed that MnL 22Cl exhibited higher catalytic activity over MnL 12Cl under a comparable condition, which confirmed that an open active centre is essential for modulating the activities of the two enzyme mimics. Moreover, under the conditions employed, hydrolytic rates of PNPP induced by these Mn(III) complexes were faster in Gemini 16-2-16 micelles than that in the micellar solution of cetyltrimethylammonium bromide (CTAB), a conventional analogue of Gemini 16-2-16. [...]

RETRACTED ARTICLE: Kinetic and anion degradation products study on photocatalytic degradation of reactive orange 5 solution with phosphotungstic acid

86%

Zhong J., Zhao H., Ma D., Lian A., Li M., Xie B., Li J.

Open Chemistry

2008

vol. 6

issue 1

99-105

Increasing environmental pollution caused by toxic dyes is a matter of great concern due to their hazardous nature. So it is crucial to develop processes which can destroy these dyes effectively. It has been generally agreed that reactive orange 5 (KGN) can be effectively degraded in aerated phosphotungstic acid (HPA) in a homogeneous reaction system using near-UV irradiation. In this paper, photocatalytic degradation of reactive orange 5 solutions with phosphotungstic acid was investigated, especially more attention was paid to the kinetic model and the anion degradation products. The results revealed that the photocatalytic degradation reaction of KGN with HPA in a homogenous solution can be described by Langmuir-Hinshelwood equation and Langmuir-Hinshewood kinetic model described it well. The reaction manifested the first order with lower concentration(⩽30 mg L−1) with the limiting rate constant and the adsorption constant in this case being 0.8098 mg L−1 min−1 and 4.359 10−2 L mg−1, respectively. The degradation mechanism of KGN with HPA is different from that with TiO2, the anion products of the two reaction systems are the same. The difference in degradation mechanism of KGN with HPA from that with TiO2 is caused by the nature of the photocatalyst. [...]

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2 Open Chemistry

1 2009

1 2008

2 Li J.

1 Fan G.

1 Jiang W.

1 Li M.

1 Lian A.

1 Ma D.

1 Xie B.

1 Xu B.

1 Zhang J.

1 Zhao H.

1 Zhong J.

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Hydrolysis kinetics of p-nitrophenylpicolinate catalyzed by schiff base Mn(III) complexes in Gemini 16-2-16 micellar solutiony

RETRACTED ARTICLE: Kinetic and anion degradation products study on photocatalytic degradation of reactive orange 5 solution with phosphotungstic acid