Experimental and theoretical study of catalytic dye degradation and bactericidal potential of multiple phase Bi and MoS2 doped SnO2 quantum dots

• Published in: RSC advances Vol. 13; no. 16; pp. 10861 - 10872
• Main Authors: Habib, Ayesha, Ikram, Muhammad, Haider, Ali, Ul-Hamid, Anwar, Shahzadi, Iram, Haider, Junaid, Mohammed Benali Kanoun, Goumri-Said, Souraya, Nabgan, Walid
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 06-04-2023; The Royal Society of Chemistry
• Subjects: Antiinfectives and antibacterials; Antimicrobial agents; Bismuth; Chemistry; Degradation; Density functional theory; Dyes; E coli; Functional groups; Lattice vacancies; Methylene blue; Molybdenum disulfide; Optical properties; Quantum dots; Strong interactions (field theory); Tin dioxide; Two dimensional materials
• ISSN: 2046-2069
• DOI: 10.1039/d3ra00698k

In the present study, different concentrations (1 and 3%) of Bi were incorporated into a fixed amount of molybdenum disulfide (MoS2) and SnO2 quantum dots (QDs) by co-precipitation technique. This research aimed to increase the efficacy of dye degradation and bactericidal behavior of SnO2. The high recombination rate of SnO2 can be decreased upon doping with two-dimensional materials (MoS2 nanosheets) and Bi metal. These binary dopants-based SnO2 showed a significant role in methylene blue (MB) dye degradation in various pH media and antimicrobial potential as more active sites are provided by nanostructured MoS2 and Bi3+ is responsible for producing a variety of different oxygen vacancies within SnO2. The prepared QDs were described via morphology, optical characteristics, elemental composition, functional group, phase formation, crystallinity, and d-spacing. In contrast, antimicrobial activity was checked at high and low dosages against Escherichia coli (E. coli) and the inhibition zone was calculated utilizing a Vernier caliper. Furthermore, prepared samples have expressed substantial antimicrobial effects against E. coli. To further explore the interactions between the MB and Bi/MoS2–SnO2 composite, we modeled and calculated the MB adsorption using density functional theory and the Heyd–Scuseria–Ernzerhof hybrid (HSE06) approach. There is a relatively strong interaction between the MB molecule and Bi/MoS2–SnO2 composite.