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Process Conditions and Kinetics for the Removal of Copper from Water by Electrocoagulation

机译：电凝去除水中铜的工艺条件和动力学

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摘要

The present study provides results from a study of the removal of copper from water through electrochemically generated Al3+ using aluminium alloy as the electrodes. Various operating conditions on the removal efficiency of copper were investigated, such as initial copper ion concentration, initial pH, current density, and temperature. Results showed that the optimum removal efficiency of 98.5% was achieved at a current density of 0.025 A/dm2, at pH of 7.0. Effects of co-existing anions such as carbonate, phosphate, silicate, and fluoride were studied on the removal efficiency of copper. Results of pilot scale study show that the process was technologically feasible. Adsorption of copper could be described by the Langmuir adsorption isotherm suggesting monolayer coverage of adsorbed molecules. First- and second-order rate equations, Elovich and Intraparticle diffusion models, were applied to study adsorption kinetics. The adsorption process follows the second-order kinetics model with good correlation. Temperature studies showed that adsorption was endothermic and spontaneous in nature.
机译：本研究提供了以铝合金为电极通过电化学生成的Al3 +从水中去除铜的研究结果。研究了去除铜效率的各种操作条件，例如初始铜离子浓度，初始pH，电流密度和温度。结果表明，在pH值为7.0时，电流密度为0.025 A / dm2时，最佳去除效率为98.5％。研究了共存阴离子如碳酸盐，磷酸盐，硅酸盐和氟化物对铜去除效率的影响。中试规模的研究结果表明，该工艺在技术上是可行的。铜的吸附可以通过Langmuir吸附等温线描述，表明吸附分子的单层覆盖。一阶和二阶速率方程，Elovich和粒子内扩散模型用于研究吸附动力学。吸附过程遵循具有良好相关性的二阶动力学模型。温度研究表明，吸附本质上是吸热的和自发的。

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