Department of Chemistry, School of Natural Sciences, National University of Science and Technology (NUST), Islamabad 44000, Pakistan.
Department of Chemistry, University of Swabi, Anbar 23561, Khyber Pakhtunkhwa, Pakistan.
Int J Biol Macromol. 2024 Oct;278(Pt 2):134764. doi: 10.1016/j.ijbiomac.2024.134764. Epub 2024 Aug 15.
The growing population and urbanization have adversely affected the environment including water. The waste water from industries has affected not only human but also animals. The availability of clean water is one of the foremost needs for living organism. This makes very urgent to find reliable solutions for cleaning waste water. These days catalysis is one the best solutions to remove and degrade organic pollutants. In this work, porous composite polymer films have been designed through facile method which were employed to stabilize zero-valent metal nanoparticles (NPs). The sustainable, environmentally friendly polymer matrix with attached metal NPs was applied for the effective catalytic degradation of both phenolic compounds and organic dyes. The different composite films consist of ZnO NPs embedded in an Oxidized Alginate-Chitosan (OAlg-CS) biomatrix named as OAlg-CS/ZnO with various percentages of ZnO as a support for metallic Cu NPs. The ZnO NPs have been incorporated into OAlg-CS polymer with 10, 15, and 20 wt% and are designated as OAlg-CS/ZnO-10, OAlg-CS/ZnO-15, OAlg-CS/ZnO-20. Various analytical techniques were utilized to investigate the shape, morphology, elemental composition, functional groups and stability of the composite films. All these polymer nanocomposite films were then evaluated for removal of model organic pollutants comprising p-nitrophenol (4-NP), methylene blue (MB), and methyl orange (MO). The K value for 4-NP was 2.19 × 10 min, 4.68 × 10 min for MO and 8.99× 10 min for MB. The experimental results demonstrated that OAlg-CS/ZnO-20 films show the highest catalytic activity as compared to OAlg-CS/ZnO, OAlg-CS/ZnO-10, and OAlg-CS/ZnO-15. The order of rate constants for nitrophenol and dyes using OAlg-CS/ZnO-20 was found to be MB ˃ MO ˃ 4-NP, showing the selectivity of these composite films. The prepared composite films were also investigated for their antibacterial activity against Gram-positive and Gram-negative bacteria and all the films exhibited good anti-bacterial activity, with OAlg-CS/ZnO-20 showed the highest anti-bacterial activity.
人口增长和城市化对环境造成了负面影响，包括水。工业废水不仅影响人类，也影响动物。清洁水的供应是生物生存的首要需求之一。这使得寻找可靠的废水处理方法变得非常紧迫。如今，催化是去除和降解有机污染物的最佳方法之一。在这项工作中，通过简单的方法设计了多孔复合聚合物薄膜，并用其稳定零价金属纳米粒子（NPs）。具有可持续性、环保性的聚合物基质与附着的金属 NPs 一起用于有效催化降解酚类化合物和有机染料。不同的复合薄膜由嵌入氧化海藻酸钠-壳聚糖（OAlg-CS）基质中的 ZnO NPs 组成，称为 OAlg-CS/ZnO，其中 ZnO 作为金属 Cu NPs 的载体，其含量分别为 10、15 和 20 wt%。将 ZnO NPs 掺入 OAlg-CS 聚合物中，掺入量分别为 10、15 和 20 wt%，并分别标记为 OAlg-CS/ZnO-10、OAlg-CS/ZnO-15 和 OAlg-CS/ZnO-20。利用各种分析技术研究了复合薄膜的形状、形貌、元素组成、官能团和稳定性。然后，所有这些聚合物纳米复合材料薄膜都被评估用于去除包含对硝基苯酚（4-NP）、亚甲基蓝（MB）和甲基橙（MO）的模型有机污染物。4-NP 的 K 值为 2.19×10 min，MO 的 K 值为 4.68×10 min，MB 的 K 值为 8.99×10 min。实验结果表明，与 OAlg-CS/ZnO、OAlg-CS/ZnO-10 和 OAlg-CS/ZnO-15 相比，OAlg-CS/ZnO-20 薄膜显示出最高的催化活性。使用 OAlg-CS/ZnO-20 时，硝基苯酚和染料的速率常数顺序为 MB ˃ MO ˃ 4-NP，表明这些复合薄膜具有选择性。还研究了制备的复合薄膜对革兰氏阳性菌和革兰氏阴性菌的抗菌活性，所有薄膜均表现出良好的抗菌活性，其中 OAlg-CS/ZnO-20 的抗菌活性最高。
