School Of Basic And Applied Sciences

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    Facile synthesis of Bi2WO6/rGO nanocomposites for photocatalytic and solar cell applications
    (Elsevier Ltd, 2021-02-22T00:00:00) Shad, Naveed Akhtar; Sajid, Muhammad Munir; Afzal, Amir Muhammad; Amin, Nasir; Javed, Yasir; Hassan, Safia; Imran, Zahid; Razaq, Aamir; Yousaf, Muhammad Imran; Munawar, Anam; Sharma, Surender Kumar
    Manipulation of materials at nanoscale provides many new and enhanced properties to be utilized for multifaceted applications, which was not possible before. In this study, we fabricated Bi2WO6/rGO composites using hydrothermal method. The obtained composites were then examined using different analytical techniques such as XRD, SEM, TEM, FTIR, XPS, BET, and AFM. Their catalytic properties were assayed by carrying out the degradation of organic dye Rhodamine B (RhB) and employed as a hole transport layer (HTL) in the perovskite solar cells. The fabricated nanocomposites were able to degrade 98% of dye solution within 4 h. The improved photocatalysis is attributed to a large surface area ~86.06 m2/g with pore size 7.812 nm and enhanced separation of electron-hole pair charges due to rGO sheets. The open-circuit voltage was increased up to 0.94 V when composite materials were used as HTL. The power conversion efficiency (PCE) of the device was enhanced to 11% because of the improvement in the interface quality between HTL and the perovskite layer. It is conceived that the fabricated nanomaterial may show excellent potential in smart solar cell applications. � 2021 Elsevier Ltd and Techna Group S.r.l.
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    Green Synthesis of TiO2 Nanoparticles Using Acorus calamus Leaf Extract and Evaluating its Photocatalytic and In Vitro Antimicrobial Activity
    (MDPI, 2022-01-31T00:00:00) Ansari, Afzal; Siddiqui, Vasi Uddin; Rehman, Wahid Ul; Akram, Md. Khursheed; Siddiqi, Weqar Ahmad; Alosaimi, Abeer M.; Hussein, Mahmoud A.; Rafatullah, Mohd
    Here, we present an innovative and creative sustainable technique for the fabrication of titania (TiO2) using Acorus calamus (A. calamus) leaf extract as a new biogenic source, as well as a capping and reducing agent. The optical, structural, morphological, surface, and thermal character-istics of biosynthesized nanoparticles were investigated using UV, FTIR, SEM, DLS, BET, and TGA-DSC analysis. The phase formation and presence of nanocrystalline TiO2 were revealed by the XRD pattern. FTIR analysis revealed conjugation, as well as the presence of Ti�O and O�H vibrational bands. The nanoparticles were noticed to be globular, with an average size of 15�40 nm, according to the morphological analysis, and the impact of size quantification was also investigated using DLS. The photocatalytic activity of bare, commercial P-25 and biosynthesized TiO2 (G-TiO2) nano-particles in aqueous solution of rhodamine B (RhB) dye was investigated under visible light irradiation at different time intervals. The biosynthesized TiO2 nanoparticles exhibited strong photocata-lytic activity, degrading 96.59% of the RhB dye. Different kinetic representations were utilized to analyze equilibrium details. The pseudo-first-order reaction was best suited with equilibrium rate constant (K1) and regression coefficients (R2) values 3.72 � 10?4 and 0.99, respectively. The antimi-crobial efficacy of the prepared nanoparticles was investigated using the disc diffusion technique. Further, biosynthesized TiO2 showed excellent antimicrobial activity against the selected gram-pos-itive staining (B. subtilis, S. aureus) over gram-negative (P. aeruginosa, E. coli) pathogenic bacteria in comparison to bare TiO2. � 2022 by the authors. Licensee MDPI, Basel, Switzerland.
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    Green Synthesis of TiO2 Nanoparticles Using Acorus calamus Leaf Extract and Evaluating its Photocatalytic and In Vitro Antimicrobial Activity
    (MDPI, 2022-01-31T00:00:00) Ansari, Afzal; Siddiqui, Vasi Uddin; Rehman, Wahid Ul; Akram, Md. Khursheed; Siddiqi, Weqar Ahmad; Alosaimi, Abeer M.; Hussein, Mahmoud A.; Rafatullah, Mohd
    Here, we present an innovative and creative sustainable technique for the fabrication of titania (TiO2) using Acorus calamus (A. calamus) leaf extract as a new biogenic source, as well as a capping and reducing agent. The optical, structural, morphological, surface, and thermal character-istics of biosynthesized nanoparticles were investigated using UV, FTIR, SEM, DLS, BET, and TGA-DSC analysis. The phase formation and presence of nanocrystalline TiO2 were revealed by the XRD pattern. FTIR analysis revealed conjugation, as well as the presence of Ti�O and O�H vibrational bands. The nanoparticles were noticed to be globular, with an average size of 15�40 nm, according to the morphological analysis, and the impact of size quantification was also investigated using DLS. The photocatalytic activity of bare, commercial P-25 and biosynthesized TiO2 (G-TiO2) nano-particles in aqueous solution of rhodamine B (RhB) dye was investigated under visible light irradiation at different time intervals. The biosynthesized TiO2 nanoparticles exhibited strong photocata-lytic activity, degrading 96.59% of the RhB dye. Different kinetic representations were utilized to analyze equilibrium details. The pseudo-first-order reaction was best suited with equilibrium rate constant (K1) and regression coefficients (R2) values 3.72 � 10?4 and 0.99, respectively. The antimi-crobial efficacy of the prepared nanoparticles was investigated using the disc diffusion technique. Further, biosynthesized TiO2 showed excellent antimicrobial activity against the selected gram-pos-itive staining (B. subtilis, S. aureus) over gram-negative (P. aeruginosa, E. coli) pathogenic bacteria in comparison to bare TiO2. � 2022 by the authors. Licensee MDPI, Basel, Switzerland.