Faculty of Physical Chemistry, University of Belgrade, 11158 Belgrade, Serbia.
Faculty of Pharmacy, University of Belgrade, 11221 Belgrade, Serbia.
Sci Total Environ. 2020 Sep 15;735:139530. doi: 10.1016/j.scitotenv.2020.139530. Epub 2020 May 19.
Novel composites of BEA zeolite and silver tungstophosphate were prepared by different procedures: two-step impregnation, ion-exchange, and as physical mixtures with varying component mass ratios. Composites were characterized using Atomic force microscopy, Infrared, Raman and Atomic absorption spectroscopy, and results were related to adsorption properties and antimicrobial efficiencies of the composites. Prepared samples were tested as antimicrobial agents for fungal and different bacterial strains, as well as for adsorbents for pesticide nicosulfuron in aqueous solutions by using High-performance liquid chromatography. Experimental conditions for batch adsorption testing were optimized in order to efficiently eliminate nicosulfuron from aqueous solutions, while enabling antimicrobial activity of these advanced materials. Antimicrobial efficiency of composites was verified, and indicated that silver ion persistence in the solid phase is of utmost significance for the antimicrobial activity. Spectroscopic investigation revealed interaction of the silver tungstophosphate active phase and the zeolite framework, giving evidence of uniform distribution of active sites in the synthesized materials that proved to be essential for adsorption application. The best obtained adsorption capacity, as well as highest antimicrobial efficiency, is found for composite samples prepared by two-step impregnation with (BEA: silver tungstophosphate) mass ratio 2:1. The amount of nicosulfuron removed from water suspension was 38.2 mg per gram of composite, and the minimum inhibitory concentration determined for all investigated gram-negative bacteria was 125 μg mL.
新型 BEA 沸石-磷钨酸银复合材料通过不同方法制备：两步浸渍法、离子交换法和不同质量比的物理混合物法。采用原子力显微镜、红外、拉曼和原子吸收光谱对复合材料进行了表征，并将结果与复合材料的吸附性能和抗菌效率相关联。采用高效液相色谱法，将制备的样品作为抗真菌和不同细菌菌株的抗菌剂，以及作为水中烟嘧磺隆农药的吸附剂进行测试。为了从水溶液中有效去除烟嘧磺隆，同时保持这些先进材料的抗菌活性，优化了批量吸附测试的实验条件。抗菌效率的验证表明，银离子在固相中的持久性对于抗菌活性至关重要。光谱研究表明，磷钨酸银活性相与沸石骨架相互作用，证明了活性位在合成材料中的均匀分布，这对于吸附应用是必不可少的。通过两步浸渍法（BEA:磷钨酸银）质量比 2:1 制备的复合样品具有最佳的吸附容量和最高的抗菌效率。从水悬浮液中去除的烟嘧磺隆量为每克复合样品 38.2mg，所有研究的革兰氏阴性菌的最低抑菌浓度均为 125μg/mL。
