The performance of the Coconut shell (CS) and Bael shell (BS) activated carbon electrodes on removal of Methylene blue (MB) and Eosin-Y (EY) dyes have been carried out by electro-adsorption process. Modification of electrodes is done to enhance the decolourization performances. The colour removal capability of the electrodes are evaluated by varying the process parameters such as time (15-150 min), potential (5- 45 V) and initial dye concentration as (25-200 mg/L) in batch mode. The adsorption isotherm is determined by Langmuir, Freundlich and Jovanic-Isotherms models. The kinetic data are evaluated by using Pseudo-first and Pseudo-second order model and the rate of diffusion is determined by Intra-particle diffusion model. The electrochemical studies are carried out by cyclic voltammetry and Tafel plots. The experimental results depict that the adsorption isotherm follow the Langmuir isotherm model with the correlation co-efficient, R² = 0.99 for CS activated carbon electrode system, whereas the BS activated carbon electrode system strongly adhere to Freundlich Isotherm models. In addition, the rate kinetics follow Pseudo-first order kinetic model with R² = 0.99 for all the studies. The surface changes, elemental interaction, porosity, functional groups involved in electro-adsorption process and thermal stability are analysed for raw and modified form of electrodes using SEM, EDS, BET, FTIR and TGA respectively.

中文翻译：

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活性炭电极通过电吸附法使阴离子和阳离子染料脱色

椰子壳（CS）和贝尔壳（BS）活性炭电极在亚甲基蓝（MB）和曙红-Y（EY）染料去除方面的性能已通过电吸附工艺进行。进行电极修饰以增强脱色性能。通过以分批方式更改时间，时间（15-150分钟），电势（5-45 V）和初始染料浓度（25-200 mg / L）等过程参数，可以评估电极的脱色能力。吸附等温线由Langmuir，Freundlich和Jovanic-Isotherms模型确定。通过使用伪一级和伪第二级模型评估动力学数据，并通过粒子内扩散模型确定扩散速率。通过循环伏安法和Tafel图进行电化学研究。对于CS活性炭电极系统，其值为² = 0.99，而对于BS活性炭电极系统，其强烈遵循Freundlich Isotherm模型。此外，所有研究的速率动力学均遵循伪一阶动力学模型，R ² = 0.99。分别使用SEM，EDS，BET，FTIR和TGA分析了电极的原始形式和改性形式，分析了表面变化，元素相互作用，孔隙率，电吸附过程中涉及的官能团和热稳定性。