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Ahmad A, Khawar MR, Ahmad I, Javed MH, Ahmad A, Rauf A, Younas U, Nazir A, Choi D, Karami AM. Green synthesis of ZnO nanocubes from Ceropegia omissa H. Huber extract for photocatalytic degradation of bisphenol An under visible light to mitigate water pollution. ENVIRONMENTAL RESEARCH 2024; 249:118093. [PMID: 38237759 DOI: 10.1016/j.envres.2023.118093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 12/26/2023] [Accepted: 12/31/2023] [Indexed: 02/15/2024]
Abstract
Plastic pollution has become a major environmental problem because it does not break down and poses risks to ecosystems and human health. This study focuses on the environmentally friendly synthesis of ZnO nanocubes using an extract from Ceropegia omissa H. Huber plant leaves. The primary goal is to investigate the viability of these nanocubes as visible-light photocatalysts for the degradation of bisphenol A (BPA). The synthesized ZnO nanocubes have a highly crystalline structure and a bandgap of 3.1 eV, making them suitable for effective visible-light photocatalysis. FTIR analysis, which demonstrates that the pertinent functional groups are present, demonstrates the chemical bonding and reducing processes that take place in the plant extract. The XPS method also studies zinc metals, oxygen valencies, and binding energies. Under visible light irradiation, ZnO nanocubes degrade BPA by 86% in 30 min. This plant-extract-based green synthesis method provides a long-term replacement for traditional procedures, and visible light photocatalysis has advantages over ultraviolet light. The study's results show that ZnO nanocubes may be good for the environment and can work well as visible light photocatalysts to break down organic pollutants. This adds to what is known about using nanoparticles to clean up the environment. As a result, this study highlights the potential of using environmentally friendly ZnO nanocubes as a long-lasting and efficient method of reducing organic pollutant contamination in aquatic environments.
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Affiliation(s)
- Awais Ahmad
- Department of Chemistry, The University of Lahore, Lahore, Pakistan.
| | - Muhammad Ramzan Khawar
- Department of Mechanical Engineering (Integrated Engineering Program), Kyung Hee University, 1732, Deogyeong-Daero, Yongin, Gyeonggi, 17104, South Korea
| | - Ikram Ahmad
- Department of Chemistry, University of Sahiwal, Sahiwal, Pakistan
| | - Muhammad Hassan Javed
- Sustainable Development Study Centre, Government College University, Lahore, 54000, Pakistan
| | - Anees Ahmad
- Sustainable Development Study Centre, Government College University, Lahore, 54000, Pakistan
| | - Abdul Rauf
- Sustainable Development Study Centre, Government College University, Lahore, 54000, Pakistan
| | - Umer Younas
- Department of Chemistry, The University of Lahore, Lahore, Pakistan.
| | - Arif Nazir
- Department of Chemistry, The University of Lahore, Lahore, Pakistan.
| | - Dongwhi Choi
- Department of Mechanical Engineering (Integrated Engineering Program), Kyung Hee University, 1732, Deogyeong-Daero, Yongin, Gyeonggi, 17104, South Korea.
| | - Abdulnasser M Karami
- Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
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Ahlawat K, Jangra R, Prakash R. Environmentally Friendly UV-C Excimer Light Source with Advanced Oxidation Process for Rapid Mineralization of Azo Dye in Wastewater. ACS OMEGA 2024; 9:15615-15632. [PMID: 38585090 PMCID: PMC10993327 DOI: 10.1021/acsomega.4c00516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 03/06/2024] [Accepted: 03/08/2024] [Indexed: 04/09/2024]
Abstract
Wastewater discharged from the textile industry contains approximately 15% unfixed dyes, predominantly 60-70% azo dyes. These unfixed dyes are a major environmental concern due to their persistence and potential toxicity. In this paper, an environmentally friendly mercury-free XeI* excilamp emitting 253 nm UV light is reported, and the same has been utilized for the degradation of azo dyes using the advanced oxidation process (AOP) with TiO2/H2O2. A new process is developed in which one electrode of excilamp is coated with TiO2 nanoparticles that improves the efficiency of the dye degradation. Additionally, the effects of varying TiO2 loading concentrations, XeI*-excimer light intensity, starting dye concentration, suspension pH, and H2O2 addition are examined. The outcomes of this study confirm 13 times faster degradation in XeI*-excimer/H2O2 than in XeI*-excimer/TiO2, attributed to an abundance of hydroxyl radicals generated by the modified XeI*-excimer/H2O2. Also, the degradation of RB5 in the modified XeI*-excimer/H2O2 is 2.3 times faster as compared to that of the bare electrode XeI*-excimer/H2O2. A more than 95% reduction in chemical oxygen demand has been achieved in 40 min in the case of XeI*-excimer/H2O2. In this study, a maximum energy yield of 5712 mg/kWh is reported. Furthermore, a high degree of degradation is found in the alkaline medium (pH 10). Because textile effluent is highly alkaline, this result is significant, and direct treatment of azo dyes is possible. The use of the developed source in industrial applications appears to be highly promising based on testing on a real wastewater matrix. The treated effluent has been utilized to study its reusability for agricultural purposes on the germination of radish seeds in soil, and ∼26% enhanced germination has been observed compared to dye wastewater.
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Affiliation(s)
- Kiran Ahlawat
- Department
of Physics, Indian Institute of Technology
Jodhpur, Jodhpur Rajasthan 342037, India
| | - Ramavtar Jangra
- Department
of Physics, Indian Institute of Technology
Jodhpur, Jodhpur Rajasthan 342037, India
| | - Ram Prakash
- Department
of Physics, Indian Institute of Technology
Jodhpur, Jodhpur Rajasthan 342037, India
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Mahmoudian MH, Azari A, Jahantigh A, Sarkhosh M, Yousefi M, Razavinasab SA, Afsharizadeh M, Mohammadi Shahraji F, Pour Pasandi A, Zeidabadi A, Ilaghinezhad Bardsiri T, Ghasemian M. Statistical modeling and optimization of dexamethasone adsorption from aqueous solution by Fe3O4@NH2-MIL88B nanorods: Isotherm, Kinetics, and Thermodynamic. ENVIRONMENTAL RESEARCH 2023; 236:116773. [PMID: 37543125 DOI: 10.1016/j.envres.2023.116773] [Citation(s) in RCA: 30] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 07/16/2023] [Accepted: 07/27/2023] [Indexed: 08/07/2023]
Abstract
The presence of pharmaceutical compounds in the environment poses a significant threat to human and aquatic animal health. Dexamethasone (DEX), a synthetic steroid hormone with endocrine-disrupting effects, is one such compound that needs to be effectively removed before discharging into the environment. This research presents a novel approach utilizing magnetically recyclable Fe3O4@NH2-MIL88B NRs as an efficient adsorbent for the treatment of DEX from aqueous solutions. The synthesized adsorbent was characterized by X-ray diffraction (XRD), scanning microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), diffuse reflectance spectra (DRS), and Fourier transform infrared spectroscopy (FTIR). Response surface methodology based on central composite design (RSM-CCD) was employed to optimize DEX removal efficiency by determining the optimal conditions, including pH, adsorbent dose, time, and DEX concentration. Under the optimized conditions (pH: 5.53, adsorbent dose: 0.185 g/L, time: 16.068 min, and DEX concentration: 33.491 mg/L), Fe3O4@NH2-MIL88B NRs revealed remarkable DEX adsorption efficiency of 91 ± 1.34% and adsorption capacity of 180.01 mg/g. The Langmuir isotherm and pseudo-second-order kinetic model were found to fit well with the experimental data, indicating a monolayer and chemical adsorption process. Thermodynamic analysis revealed that the adsorption process was spontaneous and endothermic. The study also investigated the inhibitory effect of background ions on DEX removal by Fe3O4@NH2-MIL88B NRs. Magnesium exhibited superior competitive ability with dexamethasone to occupy the active sites of the adsorbent compared to other background ions. The reuse of the adsorbent over ten consecutive cycles resulted in a 39.46% decrease in removal efficiency. The Fe3O4@NH2-MIL88B NRs are surrounded by abundant amounts of functional groups and π-electrons bands that can play a key role in the adsorption and separation of DEX from aqueous environments. The promising results obtained under real conditions highlight the potential of Fe3O4@NH2-MIL88B NRs as a practical and efficient adsorbent for the removal of DEX and other similar corticosteroids from aqueous solutions.
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Affiliation(s)
- Mohammad Hassan Mahmoudian
- Research Center for Environmental Pollutants, Department of Environmental Health Engineering, Faculty of Health, Qom University of Medical Sciences, Qom, Iran
| | - Ali Azari
- Workplace Health Promotion Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Sirjan School of Medical Sciences, Sirjan, Iran.
| | - Anis Jahantigh
- Department of Environmental Health Engineering, School of Public Health, Zabol University of Medical Sciences, Zabol, Iran
| | - Maryam Sarkhosh
- Department of Environmental Health Engineering, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mahmood Yousefi
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | | | | | - Fatemeh Mohammadi Shahraji
- Research Center for Environmental Pollutants, Department of Environmental Health Engineering, Faculty of Health, Qom University of Medical Sciences, Qom, Iran
| | | | | | | | - Mohammad Ghasemian
- Tehran Sewerage Company, Operation Manager of West Tehran Wastewater Treatment Plant, Tehran, Iran
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