Silver sulfide‑magnesium oxide/graphene oxide (Ag2S-MgO/GO) nanocomposite was prepared via sol-gel/ultrasound method to modify the photo-degradation performance for rhodamine B decontamination under visible and UV light. Analytical studies were performed to distinguish the properties such as structure, morphology, and elements of prepared materials. The average crystallite size of MgO, Ag2S-MgO and Ag2S-MgO/GO is distinguished to be 24.2, 29.3 and 33.1 nm, respectively. The Band gap MgO, Ag2S-MgO and Ag2S-MgO/GO is 4.08, 3.25 and 2.82 eV, respectively. Ag2S-MgO/GO nanocomposites illustrated the highest photo-degradation rate of rhodamine B (RhB) under UV light (98.8%) and visible light (64.8%) during in 60 min. In this project, the process parameter of pH and time were investigated for RhB degradation activity influence. The suggested mechanisms for the enhanced photo-degradation of RhB by Ag2S-MgO/GO nanocomposites under light irradiation due to enhanced charge transfer efficiency via decreasing band gap amount; reduced e-/h+ recombination of MgO with the Ag2S crystal and an enhanced removal efficiency with the supported on graphene oxide. Examination of the antibacterial and antifungal properties of the prepared nano-materials were conducted with Bacillus vallismortis, Escherichia coli, Aspergillus flavus and Trichoderma viride. The beneficial antibacterial and antifungal performance of the Ag2S-MgO/GO nanocomposites was further tested by a great reduction in the number of bacteria and fungi medium with the addition of the Ag2S-MgO/GO nanocomposites.

中文翻译：

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具有高光催化和抗菌活性的Ag2S-MgO /氧化石墨烯纳米复合材料的制备和结构。

通过溶胶-凝胶/超声方法制备了硫化银-氧化镁/氧化石墨烯（Ag2S-MgO / GO）纳米复合材料，以改变可见光和紫外光下若丹明B的光降解性能。进行了分析研究以区分诸如制备材料的结构，形态和元素的性质。MgO，Ag2S-MgO和Ag2S-MgO / GO的平均微晶尺寸分别为24.2、29.3和33.1 nm。带隙MgO，Ag 2 S-MgO和Ag 2 S-MgO / GO分别为4.08、3.25和2.82 eV。Ag2S-MgO / GO纳米复合材料在60分钟内在紫外光（98.8％）和可见光（64.8％）下显示了若丹明B（RhB）的最高光降解速率。在该项目中，研究了pH和时间的工艺参数对RhB降解活性的影响。通过减少带隙量提高电荷转移效率，在光照射下，Ag2S-MgO / GO纳米复合材料增强RhB光降解的机制。减少了MgO与Ag2S晶体的e- / h +重组，并在负载的氧化石墨烯上提高了去除效率。用缬草芽孢杆菌，大肠杆菌，黄曲霉和里氏木霉进行了制备的纳米材料的抗菌和抗真菌性能检查。通过添加Ag2S-MgO / GO纳米复合材料，细菌和真菌培养基的数量大大减少，进一步测试了Ag2S-MgO / GO纳米复合材料的有益抗菌和抗真菌性能。