Para-nitroaniline (PNA) and ortho-nitroaniline (ONA) have been considered as highly toxic contaminants in the aqueous solution, which must be treated. In the current investigation, novel magnetic nanocomposites containing copper ferrite (CuFe2O4) and gelatin-derived carbon quantum dots (CQDs) were successfully synthesized. The prepared nano catalyst was characterized by SEM, XRD, TEM, BET, FT-IR, and UV-Vis techniques. The mesoporous structure rife with mesopores of the CuFe2O4/CQD nanocomposite was shown employing the BET/BJH technique. The catalytic performance of the nano catalyst during the reduction of PNA and ONA was assessed in an aqueous medium at 25°C. The complete reduction of PNA and ONA using CuFe2O2/CQDs nanocomposite occurred in 13 s and 35 s, respectively. The pseudo-second-order constant rates (Kapp) were obtained as 2.89×10-1 s-1 and 9.3×10-2 s-1 for reducing PNA and ONA, respectively. Moreover, the magnetic nano catalyst was easily separated from the reaction solution and recycled for up to six consecutive cycles without significant loss of catalytic activity.
The primary objective of this research is to investigate the reduction of 4‐nitroaniline (4‐NA) and 2‐nitroaniline (2‐NA) using synthesized copper ferrite nanoparticles (NPs) via facile one‐step hydrothermal method as a heterogeneous nano‐catalyst. Nitroanilines were reduced in the presence and without the catalyst with a constant amount (100 mg) of reducing agent of sodium borohydride (NaBH 4 ) at room temperature in water to amino compounds. To characterize the functional groups, size, structure, and morphology of as‐prepared magnetic NPs, FTIR, XRD, SEM, and TEM were employed. The UV‐Vis spectrum was utilized to explore the catalytic effect of CuFe 2 O 4 . The outcomes revealed that the synthesized CuFe 2 O 4 as a heterogeneous magnetic nano‐catalyst catalyzed the reduction of 4‐NA and 2‐NA significantly faster than other candidate catalysts. The outcomes demonstrated that the catalyst catalyzed 4‐nitroaniline to para ‐phenylenediamine ( p ‐PDA) and 2‐nitroaniline to ortho ‐phenylenediamine (o‐PDA) with a constant rate of 7.49×10 −2 s −1 and 3.19×10 −2 s −1 , and conversion percentage of 96.5 and 95.6, in 40 s and 90 s, sequentially. Furthermore, the nanoparticles could be recovered by a magnetic separation method and reused for six consecutive cycles without remarkable loss of catalytic ability.
In this study, we fabricated an economical, non-toxic, and convenient magnetic nanocomposite of CuFe2O4 nanoparticles (NPs)/carbon quantum dots (CQDs) of citric acid via the co-precipitation method. Afterward, obtained magnetic nanocomposite was used as a nanocatalyst to reduce the ortho-nitroaniline (o-NA) and para-nitroaniline (p-NA) using a reducer agent of sodium borohydride (NaBH4). To investigate the functional groups, crystallite, structure, morphology, and nanoparticle size of the prepared nanocomposite, FT-IR, XRD, TEM, BET, and SEM were employed. The catalytic performance of the nanocatalyst was experimentally evaluated based on the ultraviolet–visible absorbance to assess the reduction of o-NA and p-NA. The acquired outcomes illustrated that the prepared heterogeneous catalyst significantly enhanced the reduction of o-NA and p-NA substrates. The analysis of the absorption showed a remarkable decrease for ortho-NA and para-NA at λmax = 415 nm in 27 s and λmax = 380 nm in 8 s, respectively. The constant rate (kapp) of ortho-NA and para-NA at the stated λmax was 8.39 × 10–2 s−1 and 5.48 × 10–1 s−1. The most highlighted result of this work was that the CuFe2O4@CQD nanocomposite fabricated from citric acid performed better than absolute CuFe2O4 NPs, since nanocomposite containing CQDs had a more significant impact than copper ferrite NPs.
This study aimed to assess the UV-shielding features of the PMMA-based thin film coatings with the addition of TiO2 and ZnO nanoparticles as nanofillers considering different contents. Furthermore, the effect of TiO2/ZnO nanohybrids at different ratios and concentrations was examined. The XRD, FTIR, SEM, and EDX analyses characterized the prepared films' functional groups, structure, and morphology. Meanwhile, the coatings' optical properties and UV-protecting capability were investigated by ultraviolet–visible (UV–Vis) spectroscopy. The UV–Vis spectroscopic study revealed that as the concentration of nanoparticles increased in the hybrid-coated PMMA, the absorption in the UVA region increased. Overall, it can be concluded that the optimal coatings for PMMA were 0.1 wt% TiO2, 0.1 wt% ZnO, and 0.025:0.025 wt% TiO2: ZnO nanohybrid. Considering the acquired FT-IR of PMMA with different content of nanoparticles before and after exposure to the UV irradiation, for some films, it was confirmed that the polymer-based thin films degraded after 720 h, with either decreasing or increasing intensity of the degraded polymer, peak shifting, and band broadening. Notably, the FTIR results were in good agreement with UV–Vis outcomes. In addition, XRD diffraction peaks demonstrated that the pure PMMA matrix and PMMA coating films did not show any characteristic peaks indicating the presence of nanoparticles. All diffraction patterns were similar with and without any nanoparticles. Therefore, it depicted the amorphous nature of polymer thin film.
The main objective of the current study is to scrutinize the fabrication of facile carbon quantum dots (CQDs) of glucose along with CuFe2O4-CQD nanocomposite and its catalytic reduction towards 2-Nitroaniline (2-NA) and 4-Nitroaniline (4-NA). Considering this, glucose-CQDs and nanocomposite of CuFe2O4-CQD were synthesized via hydrothermal and co-precipitation methods, respectively. Afterward, the fabricated nanocomposite as a promising nanocatalyst was employed to catalyze the 2-NA and 4-NA as a model of toxic organic pollutants into the 1,2-diaminobenzene (1,2-DAB) and 1,4-diaminobenzene (1,4-DAB) with a reducing agent of sodium borohydride (NaBH4), sequentially. The developed CQDs and magnetic nanocomposite were analyzed using FT-IR, XRD, VSM, SEM, TEM, BET surface area, BJH pore volume, and UV-Vis techniques. The results explicated that the magnetically recyclable CuFe2O4-CQD catalyst demonstrated high activity (∼ 96.7% conversion within 45 s, for 2-NA and ∼ 96.5% conversion within 18 s, for 4-NA) and efficient recyclability (up to 5 Cycles). The pseudo-second-order apparent reaction constant rate (k2) of 2-NA and 4-NA reduction were 7.12×10− 2 and 1.77×10− 1, respectively. These findings reveal that the fabricated catalyst offers a new method for the simultaneous reduction of 2-nitroaniline as well as 4-nitroaniline simply for environmental safety purposes.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.