Synthesized rGO/f-MWCNT-architectured 1-D ZnO nanocomposites for azo dyes adsorption, photocatalytic degradation, and biological applications

Facile Preparation of Magnetically Separable Fe3O4/ZnO Nanocomposite with Enhanced Photocatalytic Activity for Degradation of Rhodamine B

“…As shown in Figure 3 b, Fe 3 O 4 /ZnO displays three apparent peaks. The broad absorption band in the range of 3000~3500 cm −1 corresponds to the O-H stretching vibrations of adsorbed water and hydroxyl groups in the samples [ 22 , 25 , 27 ]. In the 1000 to 1600 cm −1 region, the absorption band at ~1633 cm −1 is attributed to the C=O stretching vibration of carboxylic organic acids or the bending vibration of O-H bonds from H 2 O molecules [ 25 , 27 , 29 ], due to the use of zinc acetate, sodium citrate, and sodium hydroxide.…”

“…The Zn-O stretching vibration is not detected because of the relatively low crystallinity of the composite. In contrast, the hierarchical flower ZnO shows peaks at a wave number of 512 cm −1 assigned to Zn-O stretching vibration [ 22 , 33 ]. Additionally, the peaks at ~1050 cm −1 represent the stretching vibrations of surface C-O-C [ 22 ].…”

“…In contrast, the hierarchical flower ZnO shows peaks a number of 512 cm −1 assigned to Zn-O stretching vibration [22,33]. Additionally, th at ~1050 cm −1 represent the stretching vibrations of surface C-O-C [22]. Notably sorption peaks of Fe3O4/ZnO at 3428 and 1633 cm −1 shift toward higher wavenum Additionally, the chemical composition and functional groups of the samples are further elucidated by means of FTIR.…”

“…Nanomaterials 2024, 14, x FOR PEER REVIEW 11 of strong electrostatic effect that would increase the electron cloud density surrounding Rh [22], which would cause RhB to desorb, additionally reducing the photocatalytic activit Overall, the alkaline surface of Fe3O4/ZnO is conducive to the efficient degradation of Rh…”

“…Among them, ZnO has received more attention due to its strong reducing ability and various morphologies [ 20 ]. As an efficient photocatalyst, ZnO has also demonstrated many intriguing qualities, including chemical and physical stability, strong oxidation strength, environmental friendliness, and low price [ 21 , 22 , 23 ]. However, the utilization of ZnO was not fulfilled due to its higher bandgap of ~3.3 eV [ 24 , 25 ], resulting in ZnO only absorbing 5% of the solar energy in UV light and exhibiting low degradation activity for organic pollutants [ 1 ], which limited its practical applications [ 26 , 27 ].…”