Impact of alternate Mn doping in ternary nanocomposites on their structural, optical and antimicrobial properties: Comparative analysis of photocatalytic degradation and antibacterial activity

• Published in: Journal of environmental management 2023-07, Vol.337, p.117706-117706, Article 117706
• Main Authors: Tahir, Noor, Zahid, Muhammad, Jillani, Asim, Tahir, Suman, Yaseen, Muhammad, Abbas, Qamar, Abdul Shakoor, Rana, Hussain, Syed Zajif, Shahid, Imran
• Format: Article
• Language: English
• Subjects: Anti-Bacterial Agents - pharmacology; Antibacterial activity; Catalysis; Coupling; Graphene oxide; Light; Molybdenum; MoS2; Nanocomposites - chemistry; Silver tungstate; Sunlight; Ternary heterojunction photocatalysis; Transition metal doping
• ISSN: 0301-4797; 1095-8630
• DOI: 10.1016/j.jenvman.2023.117706

The present study was done to investigate and compare the photocatalytic and antibacterial activity of two in situ Manganese doped ternary nanocomposites. The dual ternary hybrid systems comprised Mn-doped Ag2WO4 coupled with MoS2-GO and Mn-doped MoS2 coupled with Ag2WO4-GO. Both hierarchical alternate Mn-doped ternary heterojunctions formed efficient plasmonic catalysts for wastewater treatment. The novel nanocomposites were well-characterized using XRD, FTIR, SEM-EDS, HR-TEM, XPS, UV-VIS DRS, and PL techniques confirming the successful insertion of Mn+2 ions in respective host substrates. The bandgap of the ternary nanocomposites evaluated by the tauc plot showed them visible light-active nanocomposites. The photocatalytic ability of both Mn-doped coupled nanocomposites was investigated against the dye methylene blue. Both ternary nanocomposites showed excellent sunlight harvesting ability for dye degradation in 60 min. The maximum catalytic efficiency of both photocatalysts was obtained at a solution pH value of 8, photocatalyst dose and oxidant dose of 30 mg/100 mL and 1 mM for Mn–Ag2WO4/MoS2-GO, 50 mg/100 mL, 3 mM for Mn–MoS2/Ag2WO4-GO keeping IDC of 10 ppm for all photocatalysts. The nanocomposites showed excellent photocatalytic stability after five successive cycles. The response surface methodology was used as a statistical tool for the evaluation of the photocatalytic response of several interacting parameters for dye degradation by ternary composites. The antibacterial activity was determined by the inactivation of gram-positive (Staphylococcus aureus) and gram-negative (Escherichia coli) bacteria by support-based doped ternary hybrids. [Display omitted] •Alternate Mn-doped ternary heterostructures supported over graphene oxide were prepared hydrothermally.•Mn-doped ternary heterostructures (Mn-M/ AG and Mn-A/ MG) showed 95% and 99% dye degradation.•The effect of alternate Mn doping and synergistic effect of all components of a ternary system was studied.•The antibacterial activity of hybrids was determined against gram-negative (Escherichia coli) and gram-positive (Staphylococcus aureus) bacteria.