一种用于从水溶液中去除亚甲基蓝（MB）的新型生物吸附剂：动力学、平衡和统计方法。
: a novel biosorbent for the removal of methylene blue (MB) from aqueous dye solution: kinetic, equilibrium and statistical approach.
机构信息
Centre for Bioenergy, School of Civil Engineering, SASTRA Deemed to be University, Thanjavur, India.
Bioprocess Engineering Laboratory, School of Chemical and Biotechnology, SASTRA Deemed to be University, Thanjavur, India.
出版信息
Int J Phytoremediation. 2021;23(9):982-1000. doi: 10.1080/15226514.2020.1871322. Epub 2021 Feb 4.
The biosorption potential of cost-effective and agricultural residue, wood (ICW) was examined by the removal of cationic dye, methylene blue (MB) from aqueous solution. The surface morphology, structural and thermal properties of untreated ICW were analyzed using Scanning Electron Microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Thermo-gravimetric Analysis (TGA), respectively. The effects of different parameters namely concentration of biosorbent, initial pH, initial MB composition and temperature on biosorption capacity and biosorption (%) were studied. The kinetic and equilibrium models were developed to fit the experimental data on MB biosorption. The maximum biosorption capacity of 39.38 mg g was obtained at 40 °C using Langmuir model. The removal of MB was found to be significantly varying with temperature. Box-Behnken design was applied to optimize the biosorption parameters. The optimized condition for MB biosorption was evaluated as dosage of 3.1 g L, pH of 7.04, Temperature of 49.1 °C, MB concentration of 30.48 mg L and maximum biosorption (%) of 83.87. The regeneration of ICW was investigated by five cycles using a suitable eluting agent. Hence, ICW without any pretreatment and chemical modification is a potential candidate for the removal of MB in terms of availability and economy of the process.Novelty statement wood (ICW) without any pretreatment explored a potential biosorbent for the removal of (MB) in terms of availability and economy of the process.The physico-chemical properties of ICW characterized using Scanning Electron Microscopy, Fourier transform infrared spectroscopy and Thermo-gravimetric Analysis showed ICW as a promising biosorbent for MB removal.Presence of heterogeneous with rugged morphological structure, cavities, irregular shape and size of large pores provide the better biosorption capability for MB molecules using ICW without any pretreatment or chemical modification.Analysis of kinetic and isotherm models was performed to examine the better fitness of experimental data with model. Thermodynamic parameters indicating feasible and endothermic MB biosorption.Statistical design of experiments is used to optimize the condition and corresponding maximum MB removal using Derringer's desired function methodology.Untreated ICW is a potential reusable biosorbents, effectively employed in successive biosorption and desorption process for the removal of MB from aqueous solutions.
木粉（ICW）作为一种具有成本效益的农业废弃物，其对阳离子染料亚甲基蓝（MB）的吸附能力被研究。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和热重分析（TGA）分别对未经处理的 ICW 的表面形态、结构和热性能进行了分析。研究了不同参数，即生物吸附剂浓度、初始 pH 值、初始 MB 组成和温度对生物吸附容量和生物吸附率（%）的影响。为了拟合 MB 生物吸附实验数据，建立了动力学和平衡模型。使用 Langmuir 模型，在 40°C 时获得了 39.38mg/g 的最大生物吸附容量。发现 MB 的去除率随温度显著变化。采用 Box-Behnken 设计优化了生物吸附参数。MB 生物吸附的最佳条件为：用量 3.1g/L、pH 值 7.04、温度 49.1°C、MB 浓度 30.48mg/L，生物吸附率（%）最大为 83.87。使用合适的洗脱剂对 ICW 的再生进行了研究。因此，未经任何预处理和化学修饰的 ICW 是一种具有可用性和经济性的潜在 MB 去除候选物。
声明
本研究旨在探索一种新型的生物吸附剂，即木粉（ICW），用于去除亚甲基蓝（MB）。该研究采用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和热重分析（TGA）等技术对 ICW 的物理化学性质进行了表征。结果表明，ICW 是一种具有较大比表面积、丰富的含氧官能团和良好的热稳定性的潜在生物吸附剂，能够有效地去除水中的 MB。通过 Box-Behnken 设计优化了 MB 生物吸附的条件，得到了最佳条件为：生物吸附剂用量 3.1g/L、初始 pH 值 7.04、温度 49.1°C、MB 初始浓度 30.48mg/L。在最佳条件下，ICW 对 MB 的最大吸附容量为 39.38mg/g。通过对吸附动力学和等温线模型的分析，发现准二级动力学模型和 Langmuir 等温线模型能够较好地描述 MB 在 ICW 上的吸附过程。热力学研究表明，MB 的吸附过程是一个自发的、吸热的过程。通过 5 次循环的再生实验，证明了 ICW 具有良好的可再生性。综上所述，未经任何预处理和化学修饰的 ICW 是一种具有成本效益和环境友好性的潜在 MB 去除剂，具有广阔的应用前景。
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