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Kinetic Studies on Electrochemical Degradation of Rhodamine B

  • PHYSICAL CHEMISTRY OF WATER TREATMENT PROCESSES
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Abstract

Water pollution is a serious global issue. Rhodamine B (RhB) is one of the most commonly used colorants in textiles, cosmetic and the pharmaceutical industry. Its release into natural environment is not only hazardous to aquatic life, but also carcinogenic to humans and animals. Thus, the removal of RhB is of great importance to water purification and conservation. This work was performed to remove RhB wastewater by electrochemical oxidization method. The electrochemical oxidation of RhB was set at 1.3 V according to cyclic voltammograms (CVs) experiments. The experimental results illustrated that RhB solution could be rapidly removed. Decolorization of RhB by potentiostatic experiments was fitted to be pseudo first-order reaction. The apparent activation energy was calculated as 16.61 ± 0.99 kJ mol–1. Kinetic parameters such as the diffusion coefficient D, electron transfer number and the transfer coefficients β at 298 K were 8.24 × 10–7 cm2/s, 0.91 and 0.449 separately. The electrochemical reaction was a single electron process. The current-time integral curve manifested that the total electric quantity consumed was only 3.61 C compared with theoretically full oxidation electrical charge quantity 126.45 C in anode cell. Sediments by electropolymerization reaction largely decreased COD value and the electrical energy consumption. Furthermore, the changes of acute toxicity of the RhB degradation to Vibrio fischeri were also examined for the purpose of investigating the potential risk of RhB degradation products to aquatic organisms. The results showed that biotoxicity of the final solution was much lower than that of the original RhB solution. All these proved that electrochemical degradation of RhB was feasible because of its an energy-saving and low biotoxicity.

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Funding

This work was financially supported by national natural science foundation of Zhejiang province (no. Y5090310), introduce talents project of Huangshan university (no. 2015xkjq008), college students’ innovative entrepreneurial training project (nos. 201810375009 and 201910375051), and innovation foundation of Anhui province (no. 2020XZX005).

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Authors and Affiliations

  1. College of Biology and Environmental Engineering, Zhejiang Shuren University, 310015, Hangzhou, China

    Li Wang

  2. School of Chemistry and Chemical Engineering, Key Laboratory of Inorganic Functional Materials, Huangshan University, 245041, Huangshan, China

    Junbo Wang & Mengyang Zhao

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  1. Li Wang
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  2. Junbo Wang
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  3. Mengyang Zhao
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Correspondence to Junbo Wang.

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Li Wang, Wang, J. & Zhao, M. Kinetic Studies on Electrochemical Degradation of Rhodamine B. J. Water Chem. Technol. 43, 123–130 (2021). https://doi.org/10.3103/S1063455X21020132

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