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Ramzan I, Bashir M, Saeed A, Khan BS, Shaik MR, Khan M, Shaik B, Khan M. Evaluation of Photocatalytic, Antioxidant, and Antibacterial Efficacy of Almond Oil Capped Zinc Oxide Nanoparticles. MATERIALS (BASEL, SWITZERLAND) 2023; 16:5011. [PMID: 37512285 PMCID: PMC10381886 DOI: 10.3390/ma16145011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 07/06/2023] [Accepted: 07/13/2023] [Indexed: 07/30/2023]
Abstract
In this study, ZnO nanoparticles (NPs) were synthesized in the presence of almond oil at various molar ratios of zinc acetate and sodium hydroxide, including 0.5:1, 0.75:1, 1:1, 1.25:1, and 1.5:1, to obtain pH values of 11, 10, 9, 8, and 7, respectively. The XRD results revealed that ZnO NPs exhibit a hexagonal structure, with high crystallinity. SEM results showed that dense and large sized ZnO NPs were formed at pH 11, and relatively small (~30-40 nm) NPs were obtained at pH 9. The size distribution can be explained in terms of the presence of OH- ions at different pH levels. However, the larger size of the NPs at pH 7 compared to those at pH 8-11 were due to the coalescence of NPs suitable for antioxidant/antibacterial activities. ZnO NPs demonstrated a high degradation efficiency (~93%) in 90 min, with a high rate constant for Methyl Orange (MO), which is better than the previously reported rate. The larger sized almond oil capped ZnO NPs also showed excellent radical scavenging activity (94%) and are proven to be good carriers to resist Escherichia coli (E. coli) bacteria.
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Affiliation(s)
- Iqra Ramzan
- Department of Physics, Government College Women University, Sialkot 51310, Pakistan
| | - Mahwish Bashir
- Department of Physics, Government College Women University, Sialkot 51310, Pakistan
| | - Adnan Saeed
- Department of Physics, Government College Women University, Sialkot 51310, Pakistan
| | - Babar Shahzad Khan
- Department of Physics, Government College Women University, Sialkot 51310, Pakistan
| | - Mohammed Rafi Shaik
- Department of Chemistry, College of Science, King Saud University, P.O. Box. 2455, Riyadh 11451, Saudi Arabia
| | - Merajuddin Khan
- Department of Chemistry, College of Science, King Saud University, P.O. Box. 2455, Riyadh 11451, Saudi Arabia
| | - Baji Shaik
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
| | - Mujeeb Khan
- Department of Chemistry, College of Science, King Saud University, P.O. Box. 2455, Riyadh 11451, Saudi Arabia
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You X, Hou F, Xie T, Cai A, He H, Li G, Zhang F, Peng W, Fan X, Li Y. Fabrication of superhydrophilic porous carbon materials through a porogen-free method: Surface and structure modification promoting the two-electron oxygen reduction activity. J Colloid Interface Sci 2023; 639:333-342. [PMID: 36812850 DOI: 10.1016/j.jcis.2023.02.063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 02/08/2023] [Accepted: 02/12/2023] [Indexed: 02/16/2023]
Abstract
HYPOTHESIS Electrochemical manufacture of H2O2 through the two-electron oxygen reduction reaction (2e- ORR), providing prospects of the distributed production of H2O2 in remote regions, is considered a promising alternative to the energy-intensive anthraquinone oxidation process. EXPERIMENTS In this study, one glucose-derived oxygen-enriched porous carbon material (labeled as HGC500) is developed through a porogen-free strategy integrating structural and active site modification. FINDINGS The superhydrophilic surface and porous structure together promote the mass transfer of reactants and accessibility of active sites in the aqueous reaction, while the abundant CO species (e.g., aldehyde groups) are taken for the main active site to facilitate the 2e- ORR catalytic process. Benefiting from the above merits, the obtained HGC500 possesses superior performance with a selectivity of 92 % and mass activity of 43.6 A gcat-1 at 0.65 V (vs. RHE). Besides, the HGC500 can operate steadily for 12 h with the accumulation of H2O2 reaching up to 4090±71 ppm and a Faradic efficiency of 95 %. The H2O2 generated from the electrocatalytic process in 3 h can degrade a variety of organic pollutants (10 ppm) in 4-20 min, displaying the potential in practical applications.
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Affiliation(s)
- Xiangyu You
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, People's Republic of China
| | - Fang Hou
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, People's Republic of China
| | - Tianzhu Xie
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, People's Republic of China
| | - An Cai
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, People's Republic of China
| | - Hongwei He
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, People's Republic of China
| | - Guozhu Li
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, People's Republic of China.
| | - Fengbao Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, People's Republic of China
| | - Wenchao Peng
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, People's Republic of China; Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, People's Republic of China; Institute of Shaoxing, Tianjin University, Zhejiang 312300, People's Republic of China
| | - Xiaobin Fan
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, People's Republic of China; Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, People's Republic of China; Institute of Shaoxing, Tianjin University, Zhejiang 312300, People's Republic of China
| | - Yang Li
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, People's Republic of China; Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, People's Republic of China; Institute of Shaoxing, Tianjin University, Zhejiang 312300, People's Republic of China.
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Wojnárovits L, Takács E. Rate constants for the reactions of chloride monoxide radical (ClO •) and organic molecules of environmental interest. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2023; 87:1925-1944. [PMID: 37119164 DOI: 10.2166/wst.2023.114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
ClO• plays a key role in the UV/chlorine process besides Cl•, Cl2• - , and •OH. In many experiments, ClO• proved to be the main reactant that destroyed the organic pollutants in advanced oxidation process. About 200 rate constants of ClO• reactions were collected from the literature, grouped together according to the chemical structure, and the molecular structure dependencies were evaluated. In most experiments, ClO• was produced by the photolytic reaction of HClO/ClO-. For a few compounds, the rate constants were determined by the absolute method, pulse radiolysis. Most values were obtained in steady-state experiments by competitive technique or by complex kinetic calculations after measuring the pollutant degradation in the UV/chlorine process. About 30% of the listed rate constant values were derived in quantum chemical or in structure-reactivity (QSAR) calculations. The values show at least six orders of magnitude variations with the molecular structure. Molecules having electron-rich parts, e.g., phenol/phenolate, amine, or sulfite group have high rate constants in the range of 108-109 mol-1 dm3 s-1. ClO• is inactive in reactions with saturated molecules, alcohols, or simple aromatic molecules.
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Affiliation(s)
- László Wojnárovits
- Radiation Chemistry Department, Institute for Energy Security and Environmental Safety, Centre for Energy Research, H-1121, Konkoly-Thege Miklós út 29-33, Budapest, Hungary E-mail:
| | - Erzsébet Takács
- Radiation Chemistry Department, Institute for Energy Security and Environmental Safety, Centre for Energy Research, H-1121, Konkoly-Thege Miklós út 29-33, Budapest, Hungary E-mail:
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