A study on rapid acid chrome black (MB 7) spectrophotometric determination of ClO₂ and catalytic degradation of 2,6-dinitro-p-cresol (DNPC) by ClO₂

Abstract

Experiments were conducted to investigate the degradation of 2,6-dinitro-p-cresol (DNPC) in the chlorine dioxide (ClO₂) catalytic oxidation process. Pure aluminum oxide was used as the catalyst in this process. The degradation of DNPC by ClO₂ using aluminum oxide as catalyst was systematically studied by varying the experimental parameters, such as pH values, catalyst dosage, the initial concentration of DNPC and ClO₂, reaction time, etc. Under optimal condition (DNPC concentration 39 mg·L^-1, ClO₂ concentration 0.234 g·L^-1, reaction time 15 min, catalyst dosage 4.7 g·L^-1 and pH 4.32), almost complete degradation of DNPC can be achieved. The kinetic studies revealed that the ClO₂ catalytic oxidation degradation of DNPC followed pseudo-first-order kinetics with respect to both ClO₂ and DNPC concentration. The repetitive use of the catalyst was investigated along sequential feed-batch trials. The catalyst performed efficiently after five runs. In addition, a simple and convenient method for the determination of ClO₂ in water was developed by using acid chrome black 7 (MB 7) spectrophotometry in this paper.

Key words： chlorine dioxide; 2,6-dinitro-p-cresol (DNPC); aluminum oxide; water treatment; MB 7 spectrophotometry

Acknowledgments

The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Grant No. 20977013).

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