Mallikarjuna Koduru, Vattikuti Surya Veerendra Prabhakar, Manne Ravi, Manjula Gangarapu, Munirathnam Keelapattu, Mallapur Srinivas, Marraiki Najat, Mohammed Arifullah, Reddy Lebaka Veeranjaneya, Rajesh Megala, Razab Mohammad Khairul Azhar Abdul
Department of Physics, Siddharth Institute of Engineering and Technology, Puttur 517583, India.
School of Mechanical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan-si 38533, Gyeongsangbuk-do, Korea.
Nanomaterials (Basel). 2021 Oct 31;11(11):2918. doi: 10.3390/nano11112918.
Due to modernization and the scarcity of fossil fuel resources, energy demand is continuously increasing. In this regard, it is essential and necessary to create a renewable energy source that can meet future energy demands. Recently, the production of H by water splitting and removing pollutants from the water has been essential for issues of energy and environmental demands. Herein, g-CN and Ag-g-CN composite structures have been successfully fabricated by the ultrasonication method. The physio/photochemical properties of prepared g-CN and Ag-g-CN were examined with different analytical techniques such as FTIR, XRD, UV-DRS, SEM, TEM, PL, and XPS analyses. The silver quantum dots (QDS) anchored to g-CN structures performed the profound photocatalytic activities of H production, dye degradation, and antimicrobial activity under visible-light irradiation. The Ag/g-CN composite with an Ag loading of 0.02 mole has an optimum photoactivity at 335.40 μmol g h, which is superior to other Ag loading g-CN composites. The synthesized Ag/g-CN nanoparticles showed potential microbial inhibition activity during the preliminary screening, and the inhibition zones were comparable to the commercial antibiotic chloramphenicol. The loading of Ag into g-CN paves the suppression, recombination and transfer of photo-generated electron-hole pairs, leading to the enhancement of hydrogen production, the diminishment of pollutants in water under visible light irradiation, and antimicrobial activity against multidrug-resistant pathogens.
由于现代化进程以及化石燃料资源的稀缺，能源需求持续增长。在这方面，创建一种能够满足未来能源需求的可再生能源至关重要且十分必要。近来，通过水分解制氢以及去除水中污染物对于能源和环境需求问题而言至关重要。在此，通过超声法成功制备了g-CN和Ag-g-CN复合结构。采用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、紫外可见漫反射光谱（UV-DRS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、光致发光（PL）和X射线光电子能谱（XPS）分析等不同分析技术对制备的g-CN和Ag-g-CN的物理/光化学性质进行了研究。锚定在g-CN结构上的银量子点（QDS）在可见光照射下表现出高效的光催化产氢、染料降解和抗菌活性。Ag负载量为0.02摩尔的Ag/g-CN复合材料在335.40 μmol g h时具有最佳光活性，优于其他Ag负载量的g-CN复合材料。合成的Ag/g-CN纳米颗粒在初步筛选过程中显示出潜在的微生物抑制活性，其抑菌圈与市售抗生素氯霉素相当。将Ag负载到g-CN中能够抑制光生电子-空穴对的复合与转移，从而提高产氢量，减少可见光照射下水中的污染物，并增强对多重耐药病原体的抗菌活性。
