Hydrolysis Dynamics of Diquat in Aquatic Environment

Abstract:

The hydrolysis of diquat in deionized water, river water, and ground water were studied by incubation at 25°C and hydrolysis of diquat at different temperature (10°C, 25°C, and 35°C) in pH9 were investigated in the paper. The degradation was followed by GC. The experimental results indicated that the kinetics process of diquat can be described by the first-order reaction law, the hydrolysis rates of diquat in deionized water, river water, and ground water were almost the same; the pH was a critical factor of the rate of the degradation of diquat in aqueous solutions,diquat was stable in acid water and neutral water, but its hydrolysis easily took place in basic water; the higher temperture was helpful for the hydrolysis process during the range from 283k to 308k in basic water, the activation energy of hydrolysis for diquat was 25.89kJ/mol, activation entropy was –191.81 J/mol.K, and the temperature coefficient was 1.52.

• Periodical: Applied Mechanics and Materials (Volumes 608-609)
• Pages: 1079-1083
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.608-609.1079
• Online since: October 2014
• Authors: Juan Ying Peng*, Ren Bin Yang
• Keywords: Diquat, Hydrolysis, pH, Temperature

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