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Sánchez-Silva JM, Aguilar-Aguilar A, Labrada-Delgado GJ, Villabona-Leal EG, Ojeda-Galván HJ, Sánchez-García JL, Collins-Martínez H, López-Ramón MV, Ocampo-Pérez R. Hydrothermal synthesis of a photocatalyst based on Byrsonima crassifolia and TiO 2 for degradation of crystal violet by UV and visible radiation. ENVIRONMENTAL RESEARCH 2023; 231:116280. [PMID: 37257742 DOI: 10.1016/j.envres.2023.116280] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 05/24/2023] [Accepted: 05/28/2023] [Indexed: 06/02/2023]
Abstract
This work presents a one-step synthesis methodology for preparing a hydrochar (HC) doped with TiO2 (HC-TiO2) for its application on the degradation of crystal violet (CV) using UV and visible radiation. Byrsonima crassifolia stones were used as precursors along with TiO2 particles. The HC-TiO2 sample was synthesized at 210 °C for 9 h using autogenous pressure. The photocatalyst was characterized to evaluate the TiO2 dispersion, specific surface area, graphitization degree, and band-gap value. Finally, the degradation of CV was investigated by varying the operating conditions of the system, the reuse of the catalyst, and the degradation mechanism. The physicochemical characterization of the HC-TiO2 composite showed good dispersion of TiO2 in the carbonaceous particle. The presence of TiO2 on the hydrochar surface yields a bandgap value of 1.17 eV, enhancing photocatalyst activation with visible radiation. The degradation results evidenced a synergistic effect with both types of radiation due to the hybridized π electrons in the sp2-hybridized structures in the HC surface. The degradation percentages were on average 20% higher using UV radiation than visible radiation under the following conditions: [CV] = 20 mg/L, 1 g/L of photocatalyst load, and pH = 7.0. The reusability experiments demonstrated the feasibility of reusing the HC-TiO2 material up to 5 times with a similar photodegradation percentage. Finally, the results indicated that the HC-TiO2 composite could be considered an efficient material for the photocatalytic treatment of water contaminated with CV.
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Affiliation(s)
- J M Sánchez-Silva
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78260, Mexico
| | - A Aguilar-Aguilar
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78260, Mexico
| | | | - E G Villabona-Leal
- Centro de Investigación en Ciencias de la Salud y Biomedicina (CICSAB), Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78210, Mexico
| | - H J Ojeda-Galván
- Centro de Investigación en Ciencias de la Salud y Biomedicina (CICSAB), Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78210, Mexico
| | - J L Sánchez-García
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78260, Mexico
| | - H Collins-Martínez
- Ingeniería y Química de Materiales, Centro de Investigación en Materiales Avanzados, S.C, Chihuahua, 31136, Mexico
| | - M V López-Ramón
- Departamento de Química Inorgánica y Orgánica, Facultad de Ciencias Experimentales, Universidad de Jaén, Jaén, 23071, Spain
| | - R Ocampo-Pérez
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78260, Mexico.
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Afzal MA, Javed M, Aroob S, Javed T, M Alnoman M, Alelwani W, Bibi I, Sharif M, Saleem M, Rizwan M, Raheel A, Maseeh I, Carabineiro SAC, Taj MB. The Biogenic Synthesis of Bimetallic Ag/ZnO Nanoparticles: A Multifunctional Approach for Methyl Violet Photocatalytic Degradation and the Assessment of Antibacterial, Antioxidant, and Cytotoxicity Properties. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2079. [PMID: 37513090 PMCID: PMC10385465 DOI: 10.3390/nano13142079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 07/12/2023] [Accepted: 07/13/2023] [Indexed: 07/30/2023]
Abstract
In this study, bimetallic nanoparticles (NPs) of silver (Ag) and zinc oxide (ZnO) were synthesized using Leptadenia pyrotechnica leaf extract for the first time. Monometallic NPs were also obtained for comparison. The characterization of the prepared NPs was carried out using various techniques, including UV-Visible spectroscopy (UV-Vis), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The latter confirmed the crystalline nature and diameter of the monometallic and bimetallic NPs of Ag and ZnO. The SEM images of the prepared NPs revealed their different shapes. The biological activities of the NPs were evaluated concerning their antibacterial, antioxidant, and cytotoxic properties. The antibacterial activities were measured using the time-killing method. The results demonstrated that both the monometallic and bimetallic NPs inhibited the growth of Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria. The antioxidant activities of the NPs were evaluated using the DPPH (2,2-diphenyl-1-picrylhydrazyl) assay and their cytotoxicity was checked using the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay. The results indicated that the controlled quantity of the monometallic and bimetallic NPs did not affect the viability of the cells. However, the decreased cell (L-929) viability suggested that the NPs could have anticancer properties. Furthermore, the photocatalytic degradation of methyl violet and 4-nitrophenol was investigated using the prepared Ag/ZnO NPs, examining the factors affecting the degradation process and conducting a kinetic and thermodynamic study. The prepared Ag/ZnO NPs demonstrated good photocatalytic degradation (88.9%) of the methyl violet (rate constant of 0.0183 min-1) in comparison to 4-nitrophenol (NPh), with a degradation rate of 81.37% and 0.0172 min-1, respectively. Overall, the bimetallic NPs showed superior antibacterial, antioxidant, cytotoxic, and photocatalytic properties compared to the monometallic NPs of Ag and ZnO.
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Affiliation(s)
- Muhammad Asjad Afzal
- Institute of Chemistry, Green Synthesis Laboratory, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan
| | - Muhammad Javed
- Department of Chemistry, University of Lahore, Lahore 54590, Pakistan
| | - Sadia Aroob
- Institute of Chemistry, Green Synthesis Laboratory, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan
| | - Tariq Javed
- Department of Chemistry, University of Sahiwal, Sahiwal 57000, Pakistan
| | - Maryam M Alnoman
- Department of Biology, Faculty of Science, Taibah University, Yanbu P.O. Box 344, Saudi Arabia
| | - Walla Alelwani
- Department of Biochemistry, College of Science, University of Jeddah, Jeddah 21959, Saudi Arabia
| | - Ismat Bibi
- Institute of Chemistry, Green Synthesis Laboratory, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan
| | - Muhammad Sharif
- Institute of Chemistry, Green Synthesis Laboratory, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan
| | - Muhammad Saleem
- Institute of Chemistry, Green Synthesis Laboratory, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan
| | - Muhammad Rizwan
- Department of Chemistry, University of Lahore, Lahore 54590, Pakistan
| | - Ahmad Raheel
- Department of Chemistry, Quaid-e-Azam University, Islamabad 44000, Pakistan
| | - Ihsan Maseeh
- Institute of Chemistry, Green Synthesis Laboratory, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan
| | - Sónia A C Carabineiro
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Muhammad Babar Taj
- Institute of Chemistry, Green Synthesis Laboratory, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan
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Bala A, Rani G, Kumar N, Ahlawat R. Catalytic and antioxidant activity of silver nanoparticles fabricated by Neolamarckia cadamba bark extract. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2023; 25:1979-1987. [PMID: 37218063 DOI: 10.1080/15226514.2023.2214243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Plant parts have unfathomable potential in the synthesis of nanoparticles. The current study was designed for the photosynthesis of silver nanoparticles (NC-AgNPs) using bark extract of N. cadamba. Different analytical methods were used to characterize the synthesized nanoparticles. HR-TEM analysis identifies the formation of multi-shaped NC-AgNPs like spherical, quasi-spherical, rod-shaped, trigonal, square, pentagonal, and hexagonal with a size range of 18-91 nm. The crystallize size of NC-AgNPs was found to be 27.6 nm. The catalytic effectiveness of NC-AgNPs in degrading Crystal violet (CV) dye is remarkable. Important parameters such as the effect of catalyst dose and pH were investigated. Dose-dependentantioxidant activity of NC-AgNPs was determined by using 2,2-Diphenyl-1-picrylhydrazyl (DPPH) assay. Low-cost synthesis and eco-friendly reagents were the salient features that made NC-AgNPs more attractive toward catalytic and antioxidant activities.
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Affiliation(s)
- Anu Bala
- Department of Chemistry, Chaudhary Devi Lal University, Sirsa, India
| | - Gita Rani
- Department of Chemistry, Chaudhary Devi Lal University, Sirsa, India
| | - Naveen Kumar
- Department of Chemistry, M.D. University, Rohtak, India
| | - Rachna Ahlawat
- Department of Physics, Chaudhary Devi Lal University, Sirsa, India
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In Situ Etching Synthesis of TiO2-SBA-15 Nanocomposite Enhancing Adsorption and Photocatalytic Degradation. Catalysts 2022. [DOI: 10.3390/catal12111334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The adsorption-enhancing TiO2-SBA-15 photocatalyst has been synthesized by an in situ etching displacement method, which possesses unique regular hexagonal pores and large specific surface area. The as-prepared TiO2-SBA-15 can effectively adsorb and increase the concentration of pollutants in the photocatalyst and collision likelihood with the photogenerated radicals, thus improving the efficiency of photocatalytic organic degradation. The structure and morphology have been characterized by N2 adsorption isotherms, X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), and scanning electron microscopy (SEM). These characterizations confirm that TiF4 alcohol solution prefers to react with the internal surface of SBA-15 because of the Siphon effect. Fourier transform infrared (FTIR) spectra demonstrate that a Ti-O-Si bond formed after the reaction of TiF4 with SBA-15, which reveals a wonderful combination of TiO2 and SiO2 even at low temperatures. Through this function, the nanocomposite TiO2-SBA-15 could obviously improve the efficiency of photocatalytical removal of toluene in the gas phase.
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