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首页> 外文期刊>Journal of the Chilean Chemical Society >ADSORPTION OF COOMASSIE BRILLIANT BLUE R-250 DYE ONTO NOVEL ACTIVATED CARBON PREPARED FROM NIGELLA SATIVA L. WASTE: EQUILIBRIUM, KINETICS AND THERMODYNAMICS RUNNING TITLE: ADSORPTION OF BRILLIANT BLUE DYE ONTO NIGELLA SATIVA L. WASTE ACTIVATED CARBON
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ADSORPTION OF COOMASSIE BRILLIANT BLUE R-250 DYE ONTO NOVEL ACTIVATED CARBON PREPARED FROM NIGELLA SATIVA L. WASTE: EQUILIBRIUM, KINETICS AND THERMODYNAMICS RUNNING TITLE: ADSORPTION OF BRILLIANT BLUE DYE ONTO NIGELLA SATIVA L. WASTE ACTIVATED CARBON

机译：考马斯亮蓝R-250染料吸附到由NIGELLA SATIVA L.制成的新型活性炭上废料：平衡，动力学和热力学运行标题：亮蓝染料向NGIELLA SATIVA L吸附。

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In this paper a novel adsorbent was prepared from Nigella sativa L. waste and used for the removal of Coomassie Brilliant Blue dye from wastewater. The preparation of Nigella sativa waste carbon (NSWC) was achieved by adding concentrated sulfuric acid to the precursor material at an impregnation ratio (1: 1) and the mixture was left overnight. The resulting material was washed with sodium bicarbonates and finally oven dried. The kinetics of coomassie brilliant blue adsorption onto NSWC was investigated by three kinetic models. The pseudo-second order model (R2 = 0.99) was the best model fitted the experimental data. The equilibrium results revealed that Freundlich model was the best isotherm model fitted (R2= 0.994). Also the value of the Freundlich exponent (n) was found to be 1.174 suggesting the favorable dye adsorption onto NSWC. The thermodynamics results indicated negative values of ΔG proving the spontaneous nature of Brilliant Blue dye adsorption on NSWC. The exothermic nature of the adsorption was also confirmed by the negative value of change in enthalpy ΔH°. Also, the negative value of the activation entropy ΔS° demonstrates the decreased randomness at the solid-solution interface during adsorption. The present study results suggest the possible use of a waste such as Nigella sativa L. waste as a precursor for the development of a new cheap and efficient adsorbent that could be used in dyes removal from wastewater.
机译：本文从黑黑苜蓿废料中制备了一种新型吸附剂，用于从废水中去除考马斯亮蓝染料。通过以浸渍比（1：1）将浓硫酸添加到前体材料中，可制得Nigella sativa废碳（NSWC），并将混合物放置过夜。所得材料用碳酸氢钠洗涤，最后用烤箱干燥。通过三种动力学模型研究了考马斯亮蓝吸附到NSWC上的动力学。伪二阶模型（R2 = 0.99）是拟合实验数据的最佳模型。平衡结果表明，Freundlich模型是拟合最佳的等温模型（R2 = 0.994）。 Freundlich指数（n）的值也被发现为1.174，这表明染料对NSWC的吸附良好。热力学结果表明ΔG为负值，证明了亮蓝染料在NSWC上的自发吸附性。吸附的放热性质也由焓变化ΔH°的负值证实。另外，活化熵ΔS°的负值表明吸附过程中固溶体界面处的随机性降低。目前的研究结果表明，有可能利用诸如黑带变种（Nigella sativa L.）的废物作为前体来开发一种新型廉价高效的吸附剂，该吸附剂可用于废水中的染料去除。

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