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首页> 外文期刊>Desalination and water treatment >Removal of Congo red dye from aqueous solutions by adsorption onto a dual adsorbent (Neurospora crassa dead biomass and wheat bran): optimization, isotherm, and kinetics studies
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Removal of Congo red dye from aqueous solutions by adsorption onto a dual adsorbent (Neurospora crassa dead biomass and wheat bran): optimization, isotherm, and kinetics studies

机译：通过吸附在双重吸附剂（Neurospora crassa死生物质和麦麸）上去除水溶液中的刚果红染料：优化，等温线和动力学研究

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In this study, the dead biomass of Neurospora crassa along with wheat bran was used as a dual adsorbent for the removal of congo red from aqueous solutions. Decolorization experiments were conducted in batch mode by varying experimental factors such as initial pH, adsorbate concentration, wheat bran dosage, and dead biomass dosage. The experiments were designed to attain the most optimized system. The zero-point charge of the dual adsorbent was 9. The experimental equilibrium data for the decolorization of congo red were evaluated by various isotherm models. Kinetic rate constants were found using different kinetic models. The adsorption mechanisms were described by pore diffusion and Boyd plots. The dye adsorption rate followed pseudo-second-order kinetic model, and the equilibrium data were appropriately fitted to Langmuir adsorption isotherm. The overall rate of adsorption is controlled by both film diffusion and pore diffusion of dye molecules. Thermodynamic studies were performed to determine the change in Gibbs free energy (Delta G), change in enthalpy (Delta H), and change in entropy (Delta S) of the adsorption process. The adsorption was found to be endothermic in nature, and the process was spontaneous and favorable. Desorption studies were conducted using various desorbing agents. The maximum percentage of dye was desorbed using the solvent methanol.
机译：在这项研究中，神经孢霉的死生物量与麦麸一起用作双重吸附剂，用于从水溶液中去除刚果红。通过改变实验因素，例如初始pH，吸附物浓度，麦麸剂量和死生物量，以分批方式进行脱色实验。设计实验是为了获得最优化的系统。双重吸附剂的零点电荷为9。通过各种等温线模型评估了刚果红脱色的实验平衡数据。使用不同的动力学模型发现动力学速率常数。吸附机理通过孔扩散和博伊德图来描述。染料吸附速率遵循伪二级动力学模型，平衡数据适合Langmuir吸附等温线。吸附的总速率由染料分子的膜扩散和孔扩散两者控制。进行热力学研究以确定吸附过程的吉布斯自由能（ΔG）的变化，焓的变化（ΔH）和熵的变化（ΔS）。发现吸附本质上是吸热的，并且该过程是自发的且有利的。使用各种脱附剂进行脱附研究。使用溶剂甲醇将最大百分比的染料解吸。

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