Permanganate transfer and reduction by D‐glucose in benzene–cetyltrimethylammoniumbromide aqueous solution: A kinetic study
Permanganate transfer and reduction by D‐glucose in benzene–cetyltrimethylammoniumbromide aqueous solution: A kinetic study
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DOI：
10.1002/kin.20325
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发表时间：
2008-08
影响因子：
1.5
通讯作者：
M. A. Malik;Z. Khan
中科院分区：
文献类型：
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作者：
M. A. Malik;Z. Khan
在苯和高锰酸钾水溶液中加入阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)，使MnO从水相进入有机相。在525 nm处，有机相的吸光度增大，达到最大值，然后随[CTAB]浓度的增加而减小。在苯-CTAB体系中，用分光光度法研究了[CTAB]对D-葡萄糖还原高锰酸盐的影响。当CTAB的浓度达到一定浓度时，对反应速率常数的影响是催化的；此后，随着CTAB浓度的增加，观察到饱和现象。氧化反应对D-葡萄糖的反应符合一级动力学。加入H_2SO_4后，反应速率常数降低。有证据表明，锰以一种水溶性胶体MnO2的形式存在。提出并讨论了详细的反应机理和相应的反应动力学。©2008威利期刊，Inc.40：496-503,2008
The addition of cationic surfactant, cetlytrimethylammoniumbromide (CTAB), in benzene and aqueous potassium permanganate solution brought the MnO from the aqueous phase to the organic phase. At 525 nm, the absorbance of the organic phase increased until it reached a maximum, and then decreased with [CTAB]. The effect of [CTAB] on the reduction of permanganate by D-glucose in a benzene–CTAB system has been studied spectrophotmetrically. The observed effect on the rate constant is catalytic up to a certain concentration of CTAB; thereafter, a saturation phenomenon is observed with an increased concentration of CTAB. The oxidation reaction obeyed the first-order kinetics with respect to the D-glucose. On addition of H2SO4, there was a decrease in the rate constants. There is evidence for the existence of manganese as a water-soluble colloidal MnO2. A detailed mechanism with the associated reaction kinetics is presented and discussed. © 2008 Wiley Periodicals, Inc. 40: 496–503, 2008