Raees Asma, Mir Sadullah, Awwad Nasser S, Ibrahium Hala A
Department of Chemistry, COMSATS University, Islamabad, Pakistan.
Department of Chemistry, COMSATS University, Islamabad, Pakistan.
Int J Biol Macromol. 2025 Sep;321(Pt 4):146475. doi: 10.1016/j.ijbiomac.2025.146475. Epub 2025 Jul 31.
The solvent casting technique was applied to synthesize silane crosslinked, sepiolite reinforced chitosan/polyethene glycol novel nanocomposites. Scanning Electron Microscopy (SEM) shows high compatibility between sepiolite and polymer matrix. The particle size of sepiolite, ranging between 90 and 100 nm, confirms the formation of nanocomposites. Energy Dispersive X-ray (EDX) shows the purity of mixing components. However, Fourier-Transform Infrared Spectroscopy (FTIR) results illustrate the Si-O-Si stretching band at 1070 cm confirms the crosslinking reaction. X-ray Diffraction (XRD) analysis shows the characteristic peak of sepiolite at 7.1°, confirming its fibrous structure. The prepared formulations exhibited optimum swelling behaviours at pH 2. The synthesized biopolymer films were employed for methyl orange adsorption from wastewater. The adsorption studies were conducted using the batch method, and the adsorption of methyl orange was carried out under optimum pH, temperature, time, dosage, and concentration. At pH 2, using 0.025 g of silane-crosslinked nanocomposite, the adsorption of methyl orange is highly effective, achieving 99 % adsorption of the dye from an 80-ppm solution within 4 h at 35 °C. The Langmuir model shows a 0.99 R value, confirming the monolayer adsorption between adsorbent and adsorbate. The desorption experiment displays a minor desorption efficiency as confirmed by the pseudo-second model, which refers to chemisorption between dye and biopolymer film.
采用溶剂浇铸技术合成了硅烷交联、海泡石增强的壳聚糖/聚乙二醇新型纳米复合材料。扫描电子显微镜（SEM）显示海泡石与聚合物基体之间具有高度相容性。海泡石的粒径在90至100纳米之间，证实了纳米复合材料的形成。能量色散X射线（EDX）显示了混合组分的纯度。然而，傅里叶变换红外光谱（FTIR）结果表明，在1070厘米处的Si-O-Si伸缩带证实了交联反应。X射线衍射（XRD）分析显示海泡石在7.1°处有特征峰，证实了其纤维结构。所制备的制剂在pH值为2时表现出最佳的溶胀行为。合成的生物聚合物薄膜用于从废水中吸附甲基橙。采用分批法进行吸附研究，并在最佳pH值、温度、时间、剂量和浓度下进行甲基橙的吸附。在pH值为2时，使用0.025克硅烷交联纳米复合材料，甲基橙的吸附非常有效，在35℃下4小时内可从80 ppm的溶液中实现99%的染料吸附。朗缪尔模型显示R值为0.99，证实了吸附剂与吸附质之间的单层吸附。解吸实验显示解吸效率较低，这由准二级模型证实，该模型指的是染料与生物聚合物薄膜之间的化学吸附。
