Textile Materials and Process Research, National School of Engineering of Monastir (ENIM), University of Monastir, 4018 Monastir, Tunisia.
Textile Materials and Process Research, National School of Engineering of Monastir (ENIM), University of Monastir, 4018 Monastir, Tunisia.
Int J Biol Macromol. 2019 Jan;121:655-665. doi: 10.1016/j.ijbiomac.2018.10.070. Epub 2018 Oct 16.
Cellulose-based substrates could represent potential funds for the sorption of pollutants. Herein, methylene blue was selected for demonstrating the bio-sorption efficiency of Nerium oleander, Pergularia tomentosa and Populus tremula seed fibers. Their cellulose contents were 45%, 43.8% and 60%. Their lignin amounts were 21%, 8.6% and 12%, respectively. Fourier Transform InfraRed suggested that the interaction of these bio-products with methylene blue could occur between hydroxyl and ester groups of cellulose and lignin and the sulfur and nitrogen atoms of the dye. Scanning Electron Microscopy showed a swelling of the bio-matters after dye biosorption. From X-Ray Diffraction, the shifting for higher values of the peaks related to the amorphous phase indicated the establishment of new rearranged regions. Such change from the decomposition behavior event studied by Thermogravimetric Analysis/Differential Thermal Analysis revealed that methylene blue was interacted with cellulose and lignin structures. The effect of adsorbent dosage, pH, time, dye concentration and temperature was investigated in controlled batch experiments. Excellent sorption capacities followed the order: Nerium oleander (280.2 mg g) > Populus tremula (168 mg g) > Pergularia tomentosa (145.3 mg g). Freundlich fitted best the equilibrium data suggesting cooperative interactions via physisorption and chemisorption phenomenon. Kinetic data complied well with the pseudo-second-order suggesting a chemisorption mechanism.
基于纤维素的基质可以作为吸附污染物的潜在材料。本文选择亚甲基蓝来证明夹竹桃、绒毛矢车菊和欧洲山杨种子纤维的生物吸附效率。它们的纤维素含量分别为 45%、43.8%和 60%，木质素含量分别为 21%、8.6%和 12%。傅里叶变换红外光谱表明，这些生物制品与亚甲基蓝的相互作用可能发生在纤维素和木质素的羟基和酯基与染料的硫和氮原子之间。扫描电子显微镜显示，生物物质在染料吸附后发生了膨胀。X 射线衍射表明，与无定形相相关的峰的数值向更高值移动，表明新的重新排列区域的建立。这种从热重分析/差示热分析研究的分解行为变化表明，亚甲基蓝与纤维素和木质素结构相互作用。在控制批实验中研究了吸附剂用量、pH 值、时间、染料浓度和温度的影响。吸附容量的顺序为：夹竹桃（280.2 mg/g）>欧洲山杨（168 mg/g）>绒毛矢车菊（145.3 mg/g）。Freundlich 模型最适合平衡数据，表明通过物理吸附和化学吸附现象发生协同相互作用。动力学数据与伪二阶模型拟合良好，表明存在化学吸附机制。
