Abstract

Chitosan immobilized bone meal (CIBM) was prepared as a biosorbent and Victoria Blue R (VBR) textile dyestuff was removed from wastewater using CIBM via biosorption. For this purpose; the effect of pH, contact time, ionic strength, temperature, biosorbent amount, and initial sorbate concentration were studied in the batch system. The specific surface area, surface morphology and functional groups of CIBM were characterized using BET, SEM and FTIR techniques. In the preliminary biosorption studies with pure bone meal, the removal yield of VBR from solutions of 25 mg/L VBR prepared in pure water was found to be 40.32%, while after modification with chitosan, a removal yield of 98.69% was achieved. As a result, it was observed that the biosorption efficiency increased significantly via modification. The biosorption equilibrium was set at the original pH of the dye with a biosorbent amount of 3.00 g/L in 15 min., which are the optimum adsorption parameters of the batch biosorption process. The removal of VBR from real wastewater was investigated, and the efficiency was found to be 90.40%. Biosorption-desorption cycle was investigated for 11 cycles, and CIBM almost maintained its biosorption capacity until the ninth cycle. Kinetic, isotherm and thermodynamic models were used to analyze the data obtained from the experiments. As kinetic models, pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetic models were used along with the intraparticle diffusion model. For isotherm models, Langmuir, Freundlich, and Dubinin–Radushkevich (D-R) models were employed. It was determined that the experimental biosorption data obey the second-order kinetic model.

摘要

制备壳聚糖固定骨粉 (CIBM) 作为生物吸附剂，并使用 CIBM 通过生物吸附从废水中去除维多利亚蓝 R (VBR) 纺织染料。以此目的; 在批处理系统中研究了 pH、接触时间、离子强度、温度、生物吸附剂用量和初始山梨酸盐浓度的影响。采用 BET、SEM 和 FTIR 技术对 CIBM 的比表面积、表面形貌和官能团进行了表征。在纯骨粉的初步生物吸附研究中，发现在纯水中制备的 25 mg/L VBR 溶液中 VBR 的去除率为 40.32%，而经壳聚糖改性后，去除率为 98.69%。结果，观察到生物吸附效率通过改性显着提高。生物吸附平衡设定在染料的原始 pH 值，生物吸附量为 3.00 g/L 在 15 分钟内，这是批量生物吸附过程的最佳吸附参数。对实际废水中VBR的去除进行了研究，发现效率为90.40%。研究了 11 个循环的生物吸附-解吸循环，CIBM 几乎保持其生物吸附能力直到第 9 个循环。动力学、等温线和热力学模型用于分析从实验获得的数据。作为动力学模型，伪一级（PFO）和伪二级（PSO）动力学模型与粒子内扩散模型一起使用。对于等温线模型，采用 Langmuir、Freundlich 和 Dubinin-Radushkevich (DR) 模型。