Document Details

Document Type : Thesis 
Document Title :
A Seedless and Seed-Mediated Green Synthesis of Noble Multimetallic Nanoparticles for Catalytic and Antimicrobial Applications
التحضيرات الخضراء بدون بذور وبواسطة بذور من جزيئات النانو متعددة المعادن النبيلة لإستخدامها كحفازات والمضادة للميكروبات
 
Subject : Faculty of Science 
Document Language : Arabic 
Abstract : The removal of pollutants has become an essential requirement for a safe environment. Furthermore, recent research has revealed that transition and noble metal combinations can have synergistic antimicrobial effects. Therefore, the present study aimed to prepare semiconductor (ZnO NPs) and plasmonic Ag-supported ZnO NCs using a bio-approach as an alternative to hazardous synthesis approaches. In addition, a one-pot seedless biogenic synthesis of bimetallic (Ag-Ni NPs) using Salvia officinalis aqueous leaf extract as efficient reducing and stabilizing/capping agents for the production of nanoparticles. Various techniques, such as UV-Vis, PL, FTIR, XRD, SEM, EDX, TEM, and TGA-DTA were used to validity of their preparation. The antifungal susceptibility of Ag-Ni NPs alone and in combination with FLZ, the impacts of these NPs on integrity, drug efflux pumps, and biofilms formation were evaluated. In-depth studies revealed that Ag-Ni NPs at higher concentrations (3.12 μg/mL) have anti-biofilm properties and disrupt membrane integrity, as demonstrated by SEM results. In comparison, the morphological transition was halted at lower concentrations (0.78 μg/mL). Targeting biofilms and efflux pumps using novel drugs will be an alternate approach for combatting the threat of multi-drug resistant strains of C. albicans. Furthermore, Under UV light irradiation, the photocatalytic activity of ZnO NPs and ZnO-Ag nanocomposites against methylene blue were studied. The as-prepared ZnO-Ag NCs have increased photocatalytic characteristic due to a decline in the band gap energy from 3.02 eV (ZnO NPs) to 2.90eV (ZnO-Ag NCs). Increased photocatalytic activity of ZnO-Ag NCs and a faster rate of MB degradation were made possible by the deposition of plasmonic Ag NPs and the SPR effect possessed by Ag NPs. The combined study gives comprehensive information and directions for future research on noble metal-modified nano-catalysts for applications in photocatalytic degradation of textile. 
Supervisor : Dr. Maqsood Ahmad Malik 
Thesis Type : Doctorate Thesis 
Publishing Year : 1444 AH
2023 AD 
Co-Supervisor : Dr. Soha MohammadAli Albukhari 
Added Date : Thursday, June 29, 2023 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
الهـام عبدالله الزهرانيAlzahrani, Elham AbdullahResearcherMaster 

Files

File NameTypeDescription
 49226.pdf pdf 

Back To Researches Page