University of Belgrade, "VINČA" Institute of Nuclear Sciences - National Institute of the Republic of Serbia, Mike Petrovića Alasa 12-14, 11351, Belgrade, Serbia.
Innovation Center of Faculty of Technology and Metallurgy Ltd, Karnegijeva 4, 11120, Belgrade, Serbia.
J Environ Manage. 2024 Dec;371:123174. doi: 10.1016/j.jenvman.2024.123174. Epub 2024 Nov 5.
In this study, waste hemp fibers were transformed into cationically modified lignocellulosic adsorbent through a three-step process. First, a delignification/defibrillation pretreatment was performed, followed by quaternization of fibers using the synthesized ionic liquid chlorocholine chloride-urea (CCC-U). Pressure-assisted cross-linking of modified fibres, using a citric acid, produced new membrane (CCC-UHM). The removal of anionic dyes (Acid Yellow 36 (AY36), Congo Red (CR), Acid Green 25 (AG25), and Acid Blue 92 (AB92)), and oxyanions (As(V) and Cr(VI)) was tested in batch and column system. The structural characteristics and chemical properties of the syntesised materials were investigated by SEM, FTIR, Raman, XPS, XRD, specific density, porosity and point of zero charges analysis. The endothermic and spontaneous equilibration of the system resulted in high capacity (q), i.e., 302.9 mg g (AY36), 456.8 mg g (CR), 812.8 mg g (AG25), 587.6 mg g (AB92), 107.9 mg g (As(V)), and 67.84 mg g (Cr(VI)) at 25 °C, using the Langmuir model. The optimum pH for the adsorption process was 7. The multi-cycle adsorption/desorption process was followed by either decolorization, using laccase from M. thermophile expressed in Aspergillus oryzae (Novozym 51,003® laccase) immobilized on amino-modified fibers as biocatalyst, or photocatalytic degradation, in the presence of zinc oxide. The high decolorization efficiency (96%) observed for AG25 and AB92 underscores the considerable potential of laccase immobilized preparations as sustainable and eco-friendly approach for treating dye-contaminated wastewater. Photodegradation process provided low environmental threat of processed water, and biodegradabilty of exhausted membrane confirmed the circularity of the developed technology with implemented principles of sustainability.
在这项研究中，通过三步法将废弃的大麻纤维转化为阳离子改性的木质纤维素吸附剂。首先进行脱木质素/纤维细化预处理，然后使用合成的离子液体氯胆碱氯化物-尿素（CCC-U）对纤维进行季铵化。使用柠檬酸对改性纤维进行加压交联，得到新的膜（CCC-UHM）。在批量和柱系统中测试了阴离子染料（酸性黄 36（AY36）、刚果红（CR）、酸性绿 25（AG25）和酸性蓝 92（AB92））和含氧阴离子（As(V)和 Cr(VI)) 的去除。通过 SEM、FTIR、Raman、XPS、XRD、比密度、孔隙率和零电荷点分析对合成材料的结构特征和化学性质进行了研究。系统的吸热和自发平衡导致高容量（q），即在 25°C 时，302.9mg/g（AY36）、456.8mg/g（CR）、812.8mg/g（AG25）、587.6mg/g（AB92）、107.9mg/g（As(V)) 和 67.84mg/g（Cr(VI))，使用 Langmuir 模型。吸附过程的最佳 pH 值为 7。采用漆酶（Novozym 51,003®漆酶）作为生物催化剂，漆酶来源于嗜热真菌米曲霉（Aspergillus oryzae）表达，固定在氨基改性纤维上，对吸附/解吸后的多循环进行脱色处理，或在氧化锌存在下进行光催化降解。AG25 和 AB92 观察到的高脱色效率（96%）表明，固定化漆酶制剂作为一种可持续和环保的方法，具有处理染料污染废水的巨大潜力。光降解过程提供了处理水的低环境威胁，耗尽的膜的生物降解性证实了所开发技术的循环性，同时实施了可持续性原则。
