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Karthigaimuthu D, Ramasundaram S, Nisha P, Arjun Kumar B, Sriram J, Ramalingam G, Vijaibharathy P, Oh TH, Elangovan T. Synthesis of MoS 2/Mg(OH) 2/BiVO 4 hybrid photocatalyst by ultrasonic homogenization assisted hydrothermal methods and its application as sunlight active photocatalyst for water decontamination. CHEMOSPHERE 2022; 308:136406. [PMID: 36115472 DOI: 10.1016/j.chemosphere.2022.136406] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 07/31/2022] [Accepted: 09/07/2022] [Indexed: 06/15/2023]
Abstract
In this work, MoS2/Mg(OH)2/BiVO4 ternary hybrid photocatalyst was synthesized by sonicated precursor mixture to the hydrothermal procedure to generate a highly efficient solar light-induced and simply recyclable photocatalyst. The obtained hybrid was confirmed by the characteristic peaks of MoS2/Mg(OH)2/BiVO4 observed in X-ray diffraction (14.31°/18.62°/28.18°), infrared spectra (465/445/679 cm-1), ultraviolet-visible spectra (636/683/639 nm) studies, and the band-gap narrowing (2.62/2.44/2.25 eV). The morphological structure of MoS2 (rod), Mg(OH)2 (particles), and BiVO4 (random aggregates) were turned into MoS2/Mg(OH)2/BiVO4 hierarchical nanosheets that coexisted with particles. The photodegradation experiments of the photocatalysts were assessed by using Congo Red (CR), Malachite Green (MG) and Textile Industry Effluent (TIE) as the model pollutant under direct sunlight. The photocatalytic efficiency of the hybrids was noticeably 2.1 to 2.3 times higher than that of the individual components. Photocurrent response test indicate that MoS2/Mg(OH)2/BiVO4 ternary hybrid nanocomposites photocatalysts had a more effective electron/hole pair separation than individual and binary composite photocatalysts. The mechanism of photodegradation of MoS2/Mg(OH)2/BiVO4ternary hybrid photocatalysts was investigated and discussed.
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Affiliation(s)
- D Karthigaimuthu
- Smart Energy Materials Research Laboratory (SEMRL), Department of Energy Science and Technology, Periyar University, Salem, India-636011
| | | | - Parthiban Nisha
- Smart Energy Materials Research Laboratory (SEMRL), Department of Energy Science and Technology, Periyar University, Salem, India-636011
| | - B Arjun Kumar
- Quantum Materials Research Lab (QMRL), Department of Nanoscience and Technology, Alagappa University, Karaikudi, 630003, Tamil Nadu, India
| | - J Sriram
- Smart Energy Materials Research Laboratory (SEMRL), Department of Energy Science and Technology, Periyar University, Salem, India-636011
| | - G Ramalingam
- Quantum Materials Research Lab (QMRL), Department of Nanoscience and Technology, Alagappa University, Karaikudi, 630003, Tamil Nadu, India
| | - P Vijaibharathy
- Department of Physics, C. B. M. College, (Government Aided), Coimbatore, 641042, India
| | - Tae Hwan Oh
- School of Chemical Engineering, Yeungnam University, Gyeongsan, 38436, Republic of Korea
| | - T Elangovan
- Smart Energy Materials Research Laboratory (SEMRL), Department of Energy Science and Technology, Periyar University, Salem, India-636011.
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Jiang X, Zhang L, Liu M, Wang N, Dai C, Liu C, Li D. Rapid Fluorescent Determination of Hydrogen Peroxide in Serum by Europium-Metal Organic Framework Based Test Strips. ANAL LETT 2022. [DOI: 10.1080/00032719.2022.2077357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Xiaoqian Jiang
- Pharmaceutical College, Jinzhou Medical University, Jinzhou, China
| | - Liu Zhang
- School of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, Hebei, China
| | - Miao Liu
- Pharmaceutical College, Jinzhou Medical University, Jinzhou, China
| | - Nan Wang
- Pharmaceutical College, Jinzhou Medical University, Jinzhou, China
| | - Chunmei Dai
- Pharmaceutical College, Jinzhou Medical University, Jinzhou, China
| | - Chang Liu
- Pharmaceutical College, Jinzhou Medical University, Jinzhou, China
| | - Donghui Li
- Pharmaceutical College, Jinzhou Medical University, Jinzhou, China
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Halawy SA, Osman AI, Abdelkader A, Nasr M, Rooney DW. Assessment of Lewis-Acidic Surface Sites Using Tetrahydrofuran as a Suitable and Smart Probe Molecule. Chemistry 2022; 11:e202200021. [PMID: 35324079 PMCID: PMC8944219 DOI: 10.1002/open.202200021] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/04/2022] [Indexed: 02/03/2023]
Abstract
Measuring the Lewis‐acidic surface sites in catalysis is problematic when the material‘s surface area is very low (SBET ≤1 m2 ⋅ g−1). For the first time, a quantitative assessment of total acidic surface sites of very small surface area catalysts (MoO3 as pure and mixed with 5–30 % CdO (wt/wt), as well as CdO for comparison) was performed using a smart new probe molecule, tetrahydrofuran (THF). The results were nearly identical compared to using another commonly used probe molecule, pyridine. This audition is based on the limited values of the surface area of these samples that likely require a relatively moderate basic molecule as THF with pKb=16.08, rather than strong basic molecules such as NH3 (pKb=4.75) or pyridine (pKb=8.77). We propose mechanisms for the interaction of vapour phase molecules of THF with the Lewis‐cationic Mo and Cd atoms of these catalysts. Besides, dehydration of isopropyl alcohol was used as a probe reaction to investigate the catalytic activity of these catalysts to further support our findings in the case of THF in a temperature range of 175–300 °C. A good agreement between the obtained data of sample MoO3‐10 % CdO, which is characterised by the highest surface area value, the population of Lewis‐acidic sites and % selectivity of propylene at all the applied reaction temperatures was found.
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Affiliation(s)
- Samih A Halawy
- Nanocomposite Catalysts Lab., Chemistry Department, Faculty of Science at Qena, South Valley University, Qena, 83523, Egypt
| | - Ahmed I Osman
- Nanocomposite Catalysts Lab., Chemistry Department, Faculty of Science at Qena, South Valley University, Qena, 83523, Egypt.,School of Chemistry and Chemical Engineering, Queen's University Belfast, David Keir Building, Belfast, BT9 5AG, UK
| | - Adel Abdelkader
- Nanocomposite Catalysts Lab., Chemistry Department, Faculty of Science at Qena, South Valley University, Qena, 83523, Egypt
| | - Mahmoud Nasr
- Nanocomposite Catalysts Lab., Chemistry Department, Faculty of Science at Qena, South Valley University, Qena, 83523, Egypt
| | - David W Rooney
- School of Chemistry and Chemical Engineering, Queen's University Belfast, David Keir Building, Belfast, BT9 5AG, UK
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Srinithi S, Balakumar V, Chen SM. In-situ fabrication of polypyrrole composite with MoO 3: An effective interfacial charge transfers and electrode materials for degradation and determination of acetaminophen. CHEMOSPHERE 2022; 291:132977. [PMID: 34801570 DOI: 10.1016/j.chemosphere.2021.132977] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 11/15/2021] [Accepted: 11/17/2021] [Indexed: 06/13/2023]
Abstract
Pharmaceutical wastes, acetaminophen (AP) widely used in medical fields, is often discharged into water, causing harm to human health. Hence, there is an urgent need to effectively remove AP from wastewater systems. In this paper, polypyrrole (PPy) composite with MoO3 has been synthesized via an in-situ polymerization method. The as-prepared materials were thoroughly characterized by XRD, FT-IR, UV-DRS, SEM, TEM and mapping techniques. The as-prepared MoO3@PPy composite was utilized to removal of AP via photocatalytic degradation and electrochemical determination. Under optimized composite, MoO3@PPy (2) showed an excellent photocatalytic degradation and electrochemical determination of AP compared to pure MoO3 and all other composites. The higher catalytic activity was ascribed to the effective interfacial charges transfer, reduce the recombination and enhance the active surface area of electrode via a synergistic effect. The photocatalytic degradation mechanism, rate and kinetic of the reaction were investigated and discussed. The major active degradation species and an effective charge transfer properties were confirmed by trapping experiments and photocurrent spectra. In addition, the MoO3@PPy (2) modified GCE exhibit the AP determination activity by DPV with a linear range of 0.05-546 μM. The limit of detection and sensitivity of electrode were 0.0007 μM and 0.242 μM-1 cm-2 respectively. Moreover, the proposed electrode showed good selectivity, stability and reproducibility. This method was useful for the determination of AP in real samples.
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Affiliation(s)
- Subburaj Srinithi
- Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, 106, ROC, Taiwan
| | - Vellaichamy Balakumar
- Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishiku, Fukuoka, 819-0395, Japan.
| | - Shen-Ming Chen
- Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, 106, ROC, Taiwan.
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