University of Tunis El Manar, Faculty of Sciences of Tunis, B.P: 248, El Manar II, 2092 Tunis, Tunisia; Laboratory of Materials, Molecules and Applications, IPEST, Preparatory Institute of Scientific and Technical Studies of Tunis, University of Carthage, Sidi Bou Said road, B. P.512070, La Marsa, Tunisia; Biorefinery Processes Research Group, Department of Chemical and Environmental Engineering, University of the Basque Country (UPV/EHU), Plaza. Europa1, 20018 Donostia-San Sebastian, Spain.
Biorefinery Processes Research Group, Department of Chemical and Environmental Engineering, University of the Basque Country (UPV/EHU), Plaza. Europa1, 20018 Donostia-San Sebastian, Spain.
Int J Biol Macromol. 2022 Jun 15;210:94-106. doi: 10.1016/j.ijbiomac.2022.04.231. Epub 2022 May 4.
A series of novel chitosan/tannin/montmorillonite (Cs/Tn/MMT) films were synthesised by loading different (from 0.2 to 0.5 wt%) and MMT (from 0.5 to 1.5 wt%) ratios, to be used as promising low-cost biosorbents for methyl orange (MO) removal from aqueous media. The prepared films were characterised using different techniques such as x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), water contact angle, optical properties, colourimetric measurement, porosity, swelling and thickness. The effects of various parameters, i.e. initial MO concentration, adsorbent dose, pH and temperature, were studied. The Cs/Tn0.2/MMT1 film showed a high removal efficiency of 95.62% and maximum adsorption capacity of 57.37 mg/g under the optimum adsorption conditions (initial methyl orange concentration 60 mg/L, pH 7 and 25 °C). The adsorption kinetic followed the pseudo second order kinetic model and the experimental data were a good fit for the Langmuir isotherm indicating a homogeneous and monolayer adsorption process. The thermodynamic parameters suggested physical adsorption and exothermic behaviour. Consequently, Cs/Tn/MMT films showed effective potential for the uptake of anionic dyes.
一系列新型壳聚糖/单宁/蒙脱土（Cs/Tn/MMT）薄膜通过负载不同（0.2 至 0.5wt%）和 MMT（0.5 至 1.5wt%）的比例合成，可用作从水介质中去除甲基橙（MO）的有前途的低成本生物吸附剂。使用不同的技术对制备的薄膜进行了表征，例如 X 射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、水接触角、光学性质、比色测量、孔隙率、溶胀和厚度。研究了各种参数的影响，例如初始 MO 浓度、吸附剂剂量、pH 和温度。在最佳吸附条件下（初始甲基橙浓度 60mg/L、pH7 和 25°C），Cs/Tn0.2/MMT1 薄膜的去除效率高达 95.62%，最大吸附容量为 57.37mg/g。吸附动力学遵循拟二级动力学模型，实验数据很好地符合 Langmuir 等温线，表明吸附过程为均匀的单层吸附。热力学参数表明这是一种物理吸附和放热行为。因此，Cs/Tn/MMT 薄膜对阴离子染料的吸附具有有效的潜力。
