Department of Separation Science, School of Engineering Science, Lappeenranta-Lahti University of Technology (LUT), FI-53850, Lappeenranta, Finland; Environmental and Nano Sciences Group, Department of Chemistry, University of the Western Cape, Bellville, 7535, South Africa.
Department of Separation Science, School of Engineering Science, Lappeenranta-Lahti University of Technology (LUT), FI-53850, Lappeenranta, Finland; Department of Food Process Engineering, School of Engineering Sciences, College of Basic and Applied Sciences, University of Ghana, P. O. Box LG 77, Legon, Accra, Ghana.
Environ Pollut. 2024 Jan 1;340(Pt 2):122788. doi: 10.1016/j.envpol.2023.122788. Epub 2023 Oct 23.
Bio-based materials facilitate greener approach to engineering novel materials with multifunctional properties for various applications including water treatment. In this study, we extracted gliadin from wheat gluten using alcoholic solvent. The aggregation limitations of gliadin protein were overcome by functionalisation with metal oxides (MOs) TiO, AgFeO and AgFe-TiO prepared by chemical precipitations. The novel composites were characterised by scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), Fourier-transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD), thermogravimetry analysis (TGA), Brunauer Emmet-Teller (BET), and zeta potential. The multifunctionality of MOs-gliadin composites was tested through toxic Escherichia coli (E. coli) inactivation and Co adsorption from water. The antibacterial results showed excellent inhibition under both dark and light conditions. The maximum Co uptake, 101 mg/g was reached with TiO@gliadin after 24 h and best fitted the Langmuir isotherm model. The adsorption process followed pseudo-second order model with an equilibrium adsorption capacity, q= 89.86 mg/g closer to the experimental data. Thermodynamic investigations indicated that ΔG=-9.677kJ/mol,ΔH°=-123kJ/mol,and ΔS°=0.490J.K/mol, respectively, suggesting that adsorption was spontaneous and endothermic. The regenerated TiO@gliadin composite was still efficient after five consecutive cycles. This study demonstrates that MOs-gliadin blended composites are sustainable for water purification.
生物基材料为工程新型材料提供了更环保的方法，这些材料具有多功能特性，可应用于各种领域，包括水处理。在本研究中，我们使用醇溶剂从小麦面筋中提取麦醇溶蛋白。通过用化学沉淀法制备的金属氧化物 (MOs) TiO、AgFeO 和 AgFe-TiO 对麦醇溶蛋白进行功能化，克服了其聚集限制。通过扫描电子显微镜-能量色散 X 射线光谱 (SEM-EDS)、傅里叶变换红外光谱 (FTIR)、X 射线衍射 (XRD)、热重分析 (TGA)、BET 和动电电位对新型复合材料进行了表征。通过对水中有毒大肠杆菌 (E. coli) 的灭活和 Co 吸附来测试 MOs-麦醇溶蛋白复合材料的多功能性。在黑暗和光照条件下，抗菌结果均表现出优异的抑制作用。在 24 小时后，TiO@gliadin 的最大 Co 吸附量达到 101mg/g，且最符合 Langmuir 等温模型。吸附过程符合准二级动力学模型，平衡吸附容量 q=89.86mg/g，更接近实验数据。热力学研究表明，ΔG=-9.677kJ/mol，ΔH°=-123kJ/mol，ΔS°=0.490J.K/mol，表明吸附是自发的和吸热的。再生后的 TiO@gliadin 复合材料在连续五次循环后仍然有效。本研究表明，MOs-麦醇溶蛋白混合复合材料可用于水净化，是可持续的。
