Synthesis of Cu-Doped Mixed-Phase TiO₂with the Assistance of Ionic Liquid by Atmospheric-Pressure Cold Plasma

Abstract

An atmospheric-pressure dielectric barrier discharge (DBD) gas-liquid cold plasma was employed to synthesize Cu-doped TiO2 nanoparticles in an aqueous solution with the assistance of [C2MIM]BF4 ionic liquid (IL) and using air as the working gas. The influences of the discharge voltage, IL and the amount of copper nitrite were investigated. X-ray diffraction, N2 adsorption-desorption measurements and UV-Vis spectroscopy were adopted to characterize the samples. The results showed that the specific surface area of TiO2 was promoted with Cu-doping (from 57.6 m 2 •g −1 to 106.2 m 2 •g −1 with 3% Cu-doping), and the content of anatase was increased. Besides, the band gap energy of TiO2 with Cu-doping decreased according to the UV-Vis spectroscopy test. The 3%Cu-IL-TiO2 samples showed the highest efficiency in degrading methylene blue (MB) dye solutions under simulated sunlight with an apparent rate constant of 0.0223 min −1 , which was 1.2 times higher than that of non-doped samples. According to the characterization results, the reasons for the high photocatalytic activity were discussed.

Physicochemical Study of the Interaction between Gold Nanoparticles and Lipase from Candida sp. (CALB): Insights into the Nano-Bio Interface

“…and employed since it is an efficient catalyst that can be used for both hydrolysis in aqueous media and esterification in aquo-restricted media or pure organic solvents. 25,[29][30][31][32][33][34][35][36][37] Different methodologies have been developed in order to alter the stability, activity and even the enantioselectivity of enzymes. [38][39][40][41][42][43] In this context, the interaction between enzymes and AuNPs can trigger changes in enzyme conformation, and consequently, changes in their inherent properties.…”

Synthesis of Titanium Oxide Nanostructures in Ionic Liquids

“…In contrast to the other presented examples, these syntheses did not use the IL as a dopant or dopant source. Lithium and copper doping was performed in [Bmim][Cl] or [Emim][BF 4 ], respectively , . These studies indicate that in recent research the status of ILs in inorganic synthesis changed from being a solvent into being a reactant, which directly takes influence on the outcome of the synthesis.…”

“…Lithium and copper doping was performed in [Bmim] [Cl] or [Emim][BF 4 ], respectively. [79,80] These studies indicate that in recent research the status of ILs in inorganic synthesis changed from being a solvent into being a reactant, which directly takes influence on the outcome of the synthesis. In the case of the doped materials this impact is more than a template/structure-directing agent or catalyst would exhibits.…”

Gas–Liquid Cold Plasma for Synthesizing Copper Hydroxide Nitrate Nanosheets with High Adsorption Capacity

“…Gas–liquid cold plasma is a new branch of cold plasma, and has been adopted to treat waste water, produce ammonia, sterilize the bacteria, and fabricate nanomaterials . Different from plasma in the gas phase, electron‐induced reactions may take place at the gas–liquid interface in gas–liquid plasma .…”