Department of Environmental Engineering, Firat University, 23100 Elazig, Turkey.
Environ Sci Pollut Res Int. 2013 Jan;20(1):431-42. doi: 10.1007/s11356-012-0946-5. Epub 2012 May 31.
Carbonised beet pulp (BPC) produced from agricultural solid waste by-product in sugar industry was used as adsorbent for the removal of Remazol Turquoise Blue-G 133 (RTB-G 133) dye in this study. The kinetics and equilibrium of sorption process were investigated with respect to pH, temperature and initial dye concentration. Adsorption studies with real textile wastewater were also performed. The results showed that adsorption was a strongly pH-dependent process, and optimum pH was determined as 1.0. The maximum dye adsorption capacity was obtained as 47.0 mg g(-1)at the temperature of 25 °C at this pH value. The Freundlich and Langmuir adsorption models were used for describing the adsorption equilibrium data of the dye, and isotherm constants were evaluated depending on sorption temperature. Equilibrium data of RTB-G 133 sorption fitted very well to the Freundlich isotherm. Mass transfer and kinetic models were applied to the experimental data to examine the mechanisms of adsorption and potential rate-controlling steps. It was found that both external mass transfer and intra-particle diffusion played an important role in the adsorption mechanisms of dye and adsorption kinetics followed the pseudo second-order type kinetic model. The thermodynamic analysis indicated that the sorption process was exothermic and spontaneous in nature.
碳化甜菜浆（BPC）是从制糖工业的农业固体废弃物副产物中生产的，被用作吸附剂，用于去除 Remazol Turquoise Blue-G 133（RTB-G 133）染料。本研究考察了吸附过程的动力学和平衡，涉及 pH 值、温度和初始染料浓度。还进行了实际纺织废水的吸附研究。结果表明，吸附是一个强烈依赖于 pH 值的过程，最佳 pH 值确定为 1.0。在该 pH 值下，温度为 25°C 时，染料的最大吸附容量为 47.0 mg g(-1)。Freundlich 和 Langmuir 吸附模型用于描述染料的吸附平衡数据，并根据吸附温度评估等温线常数。RTB-G 133 吸附的平衡数据非常符合 Freundlich 等温线。质量转移和动力学模型被应用于实验数据，以检查吸附机制和潜在的速率控制步骤。结果发现，染料的吸附机制和吸附动力学都受到外部质量转移和颗粒内扩散的重要影响，吸附动力学遵循准二级动力学模型。热力学分析表明，吸附过程本质上是放热和自发的。
