Tuning the sound frequency in the audible region during the synthesis of the precursor TiO2: Evaluation of the sound effect on the structure and photoactivity relationship

Bandeira, Clara R.P.P.; Dória, Aline Resende; Ribeiro, Jamylle Yanka Cruz; Prado, Leandro Rafael; Jesus, Roberta Anjos de; Andrade, Heloysa Martins Carvalho; Castro, Raíra Souza de Santana; Ferreira, Luiz Fernando Romanholo; Egues, Silvia Maria; Figueiredo, Renan Tavares

doi:10.1016/j.matchemphys.2021.124521

Cited by 3 publications

(1 citation statement)

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“…The Ag 0 NP and TiO 2 synthesis by conventional methods has been widely reported and includes chemical reduction [ 34 ], sol–gel [ 35 , 36 ], microwave-coupled sol–gel [ 37 , 38 ], sonochemistry-coupled sol–gel [ 38 , 39 ], PLD [ 40 , 41 ], and sputtering [ 42 , 43 ], to mention just the most representative. Moreover, the green synthesis of both materials in a separate way has been widely studied with different plants, fungi, and microorganism extracts [ 10 , 12 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 ].…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis via Eucalyptus globulus L. Extract of Ag-TiO2 Catalyst: Antimicrobial Activity Evaluation toward Water Disinfection Process

et al. 2022

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The problem of water pollution by persistent substances and microorganisms requires solutions that materials such as silver-modified titanium dioxide can provide due to their excellent photocatalytic and antimicrobial properties. However, the synthesis methods conventionally used to obtain these materials involve toxic chemical reagents such as sodium borohydride (NaBH4). The search for alternative synthesis methods that use environmentally friendly substances, such as the biosynthesis method, was evaluated. Silver-titanium dioxide (Ag-TiO2) was synthesized by a Eucalyptus globulus L. extract as a reductive agent through sol-gel and microwave-assisted sol-gel processes. Four different solvents were tested to extract secondary metabolites to determine their roles in reducing silver nanoparticles. Titanium dioxide nanoparticles with sizes from 11 to 14 nm were obtained in the anatase phase, and no narrowing of the bandgap was observed (3.1–3.2 eV) for the Ag-TiO2 materials compared with the pure TiO2. Interestingly, the bacterial inhibition values were close to 100%, suggesting an effective antimicrobial mechanism related to the properties of silver. Finally, by the physicochemical characterization of the materials and their antimicrobial properties, it was possible to obtain a suitable biosynthesized Ag-TiO2 material as a green option for water disinfection that may be compared to the conventional methods.

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