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Morelli Venturi D, Sole Notari M, Trovarelli L, Mosconi E, Alothman AA, Molokova A, Ruser N, Meier C, Achenbach B, Lomachenko KA, Del Giacco T, Costantino F, Stock N. Synthesis, Structure and (Photo)Catalytic Behavior of Ce-MOFs Containing Perfluoroalkylcarboxylate Linkers: Experimental and Theoretical Insights. Chemistry 2024:e202400433. [PMID: 38568800 DOI: 10.1002/chem.202400433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 03/12/2024] [Accepted: 03/28/2024] [Indexed: 04/05/2024]
Abstract
Cerium-based Metal-Organic frameworks (Ce-MOFs) are attracting increasing interest due to their similar structural features to zirconium MOFs. The redox behavior of Ce(III/IV) adds a range of properties to the compounds. Recently, perfluorinated linkers have been used in the synthesis of MOFs to introduce new characteristic into the structure. We report the synthesis and structural characterization of Ce(IV)-based MOFs constructed using two perfluorinated alkyl linkers. Their structure, based on hexanuclear Ce6O4(OH)4 12+ clusters linked to each other by the dicarboxylate ions, has been solved ab-initio from X-ray powder diffraction data and refined by the Rietveld method. The crystallization kinetics and the MOF formation mechanism was also invesitigated by Synchrotron radiation with XAS spectroscopies (EXAFS and XANES). The MOFs present the same fcu cubic topology as observed in MOF-801 and UiO-66, and they showed good stability in water at different pH conditions. The electronic structure of these MOFs has been studied by DFT calculations in order to obtain insights into the density of states structure of the reported compounds, resulting in band gaps in the range of 2.8-3.1 eV. Their catalytic properties were tested both thermally and under visible light irradiation for the degradation of methyl orange (MO) dye.
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Affiliation(s)
- Diletta Morelli Venturi
- Institute of Inorganic Chemistry, Christian-Albrecht University of Kiel, Max-Eyth-Straße 2, 24118, Kiel, Germany
- Kiel Nano, Surface and Interface Science KiNSIS, Christian-Albrecht University of Kiel, Christian-Albrechts-Platz 4, 24118, Kiel, Germany
| | - Maria Sole Notari
- Department of chemistry, biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123, Perugia, Italy
| | - Letizia Trovarelli
- Department of chemistry, biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123, Perugia, Italy
| | - Edoardo Mosconi
- Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), Istituto CNR di Scienze e Tecnologie Chimiche "Giulio Natta" (CNR-SCITEC), Via Elce di Sotto 8, 06123, Perugia, Italy
- Chemistry Department, College of Science, King Saud University, 11451, Riyadh, Kingdom of Saudi Arabia
| | - Asma A Alothman
- Chemistry Department, College of Science, King Saud University, 11451, Riyadh, Kingdom of Saudi Arabia
| | - Anastasia Molokova
- European Synchrotron Radiation Facility, Avenue des Martyrs 71, 38043, Grenoble Cedex 9, France
| | - Niklas Ruser
- Institute of Inorganic Chemistry, Christian-Albrecht University of Kiel, Max-Eyth-Straße 2, 24118, Kiel, Germany
| | - Christoph Meier
- Institute of Inorganic Chemistry, Christian-Albrecht University of Kiel, Max-Eyth-Straße 2, 24118, Kiel, Germany
| | - Bastian Achenbach
- Institute of Inorganic Chemistry, Christian-Albrecht University of Kiel, Max-Eyth-Straße 2, 24118, Kiel, Germany
| | - Kirill A Lomachenko
- European Synchrotron Radiation Facility, Avenue des Martyrs 71, 38043, Grenoble Cedex 9, France
| | - Tiziana Del Giacco
- Department of chemistry, biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123, Perugia, Italy
| | - Ferdinando Costantino
- Department of chemistry, biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123, Perugia, Italy
| | - Norbert Stock
- Institute of Inorganic Chemistry, Christian-Albrecht University of Kiel, Max-Eyth-Straße 2, 24118, Kiel, Germany
- Kiel Nano, Surface and Interface Science KiNSIS, Christian-Albrecht University of Kiel, Christian-Albrechts-Platz 4, 24118, Kiel, Germany
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Sathish Kumar P, Shobana B, Prakash P. Light harvesting enhancement through band structure engineering in graphite carbon nitride / polydopamine nanocomposite photocatalyst: Addressing persistent organophosphorus pesticide pollution in water systems. Chemosphere 2024; 354:141708. [PMID: 38521104 DOI: 10.1016/j.chemosphere.2024.141708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 02/03/2024] [Accepted: 03/11/2024] [Indexed: 03/25/2024]
Abstract
Organophosphorus pesticides, particularly profenofos (PF), pose a significant threat to the food supply and human health due to their persistence, toxicity, and resistance to natural breakdown processes. An urgent need exists for an environmentally friendly solution, and photocatalysis emerges as a practical, cost-effective option. However, challenges like poor light responsiveness and difficulties in material separation and reusability persist. To address these issues, we developed a nanocomposite consisting of graphite carbon nitride (g-C3N4) doped with polydopamine (pDA) through a hydrothermal synthesis method. This innovative nanocomposite was employed as a photocatalyst to degrade PF. Various analytical techniques, including UV-DRS, FT-IR, XRD, HR-TEM, and EDAX, were utilized to characterize the synthesized nanocomposite. The strategically modulated band gaps of the nanocomposite enable efficient absorption of UV light, facilitating the robust photocatalytic degradation of PF (96.4%). Our study explored photodegradation using different g-C3N4/pDA catalyst dosages, varied PF concentrations, and pH levels (3, 5, 9, and 11) under UV light. Our findings promise applications in wastewater management, offering an efficient catalyst for PF degradation. This marks a significant stride in addressing challenges related to pesticide pollution in the environment.
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Affiliation(s)
- Ponnaiah Sathish Kumar
- PG & Research Department of Chemistry, Thiagarajar College, Madurai-09, Affiliated to Madurai Kamaraj University, Madurai, Tamil Nadu, India
| | - Babu Shobana
- PG & Research Department of Chemistry, Thiagarajar College, Madurai-09, Affiliated to Madurai Kamaraj University, Madurai, Tamil Nadu, India
| | - Periakaruppan Prakash
- PG & Research Department of Chemistry, Thiagarajar College, Madurai-09, Affiliated to Madurai Kamaraj University, Madurai, Tamil Nadu, India.
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Christina B, Thanigaimani K, Sudhakaran R, Mohan S, Arumugam N, Almansour AI, Karthikeyan Perumal. Green waste immobilized Ag/Cu feather like Bi-matrix on garment dye decomposes and their bio-efficacy. Environ Res 2024; 242:117761. [PMID: 38036214 DOI: 10.1016/j.envres.2023.117761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 11/20/2023] [Accepted: 11/21/2023] [Indexed: 12/02/2023]
Abstract
This paper describes a simple phyto-remediation of feather-like silver/copper bi-matrix (BMs) was constructed by employing pommagrant waste peel (PWP) extract as crucial role of reducing agent and chelating agents. Numerous strategies, including UV-Visible, XRD, SEM-EDX, and TEM and BET isotherm were used to analysis the optical, structural, surface area and functional properties. Ag/Cu BPNMs of TEM characterization shows feather-like architectural features with constrained size and shape. The Ag/Cu co-catalytic nanoparticles have a particle size of 34-64 nm. The photocatalytic efficiency of Ag/Cu BMs was investigated using a garment dye, Congo red (CR), at successive time intervals under halogen lamp exposure. For Ag/Cu bimetallic nanoparticles, the photocatalytic degradation rate was recorded to be 100% after 40 min which is caused by adsorption of Congo red dye molecules on Ag/Cu and their degradation by reactive oxygen species (ROS). ROS are free hydroxyl radicals such as •OH and O2• ions that have high oxidizing capacity. The developed Ag/Cu BMs shown effective bacteriostatic action against many infections.
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Affiliation(s)
- B Christina
- PG & Research Department of Chemistry, Government Arts College (Affiliated to Bharathidasan University), Tiruchirappalli - 620022, Tamilnadu, India
| | - K Thanigaimani
- PG & Research Department of Chemistry, Government Arts College (Affiliated to Bharathidasan University), Tiruchirappalli - 620022, Tamilnadu, India.
| | - R Sudhakaran
- PG & Research Department of Chemistry, Government Arts College (Affiliated to Bharathidasan University), Tiruchirappalli - 620022, Tamilnadu, India
| | - S Mohan
- PG & Research Department of Chemistry, Vivekananda College of Arts and Sciences for Women (Autonomous), Elayampalaym, Tiruchengode - 637205, Namakkal-DT, Tamilnadu, India.
| | - Natarajan Arumugam
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Abdulrahman I Almansour
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Karthikeyan Perumal
- Department of Chemistry and Biochemistry, The Ohio State University, 151 W. Woodruff Ave, Columbus, OH, 43210, USA
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Attri P, Garg S, Ratan JK, Giri AS. Silver nanoparticles from Tabernaemontana divaricate leaf extract: mechanism of action and bio-application for photo degradation of 4-aminopyridine. Environ Sci Pollut Res Int 2023; 30:24856-24875. [PMID: 35013966 DOI: 10.1007/s11356-021-18269-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 12/17/2021] [Indexed: 06/14/2023]
Abstract
Silver nanoparticles (Ag NPs) were synthesised by the reduction of Ag+ to Ag0 in the presence of enol form of flavonoids present in plant extract of Tabernaemontana divaricate (T. divaricate). Prepared Ag NPs were characterised using UV-Vis, XRD, HR-TEM with EDX and XPS techniques. XPS spectra exhibited peaks at 366 eV and 373 eV, which specified spin orbits for Ag 3d3/2, and Ag 3d5/2 that confirmed the formation of Ag NPs. Ag NPs were spherical in shape with an average size of 30 nm as revealed by HR-TEM and FE-SEM techniques. EDX studies verified the high purity of Ag NPs with silver 46.96%, carbon 16.35%, oxygen 16.22%, nitrogen 20.25% and sulphur 0.21%. LC-MS analysis of plant extract confirmed the qualitative presence of alkaloids, tannins, flavonoids, phenols, and carbohydrates. Prepared Ag NPs showed good photocatalytic activity towards degradation of 4-Amniopyridine with 61% degradation efficiency at optimum conditions in 2 h of reaction time under visible light. The ten intermediates were found within the mass number of 0-450. Ag NPs synthesised using bio-extract have also shown good inactivation against Escherichia coli (E. coli) and Bacillus subtilis (B. subtilis) bacteria due to the availability of free radicals.
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Affiliation(s)
- Pratibha Attri
- Department of Chemical Engineering, Dr. B.R. Ambedkar National Institute of Technology, Jalandhar, India
| | - Sangeeta Garg
- Department of Chemical Engineering, Dr. B.R. Ambedkar National Institute of Technology, Jalandhar, India.
| | - Jatinder Kumar Ratan
- Department of Chemical Engineering, Dr. B.R. Ambedkar National Institute of Technology, Jalandhar, India
| | - Ardhendu Sekhar Giri
- Department of Chemical Engineering, Indian Institute of Science Education and Research, Bhopal, India
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Khan S, Hussain A, He K, Liu B, Imran Z, Ambreen J, Hassan S, Ahmad M, Batool SS, Li C. Tailoring the bandgap of Mn 3O 4 for visible light driven photocatalysis. J Environ Manage 2021; 293:112854. [PMID: 34058449 DOI: 10.1016/j.jenvman.2021.112854] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 05/05/2021] [Accepted: 05/19/2021] [Indexed: 06/12/2023]
Abstract
The photocatalytic activity of pure Mn3O4 and silver (Ag) modified Mn3O4 nanoparticles have been investigated. The nanoparticles were prepared by using co-precipitation technique. The structural analysis showed that the Ag modified Mn3O4 was successfully synthesized. For instance, a slight shift to lower angle of XRD pattern was observed after Ag doping. Morphological analysis revealed that the particles have an average size of 274 nm, 287 nm and 321 nm for pure, 1% and 3% Ag modified Mn3O4 respectively. The UV-Visible analysis indicated that the bandgap of Mn3O4 decreased with increased Ag content and the band gap is 1.4 eV with the 3% of Ag content. The spectra obtained from DRS were also evaluated through inverse logarithmic derivative method (ILD) to counter check the bandgap values. 3% Ag-modified photocatalysts exhibited the enhanced decolorization efficiency compared to pure Mn3O4 nanoparticles. The pseudo first order kinetic model is used to explain the photocatalytic kinetics of the photocatalyst. The rate constant values are 0.01/min, 0.017/min and 0.024/min for pure Mn3O4, 1% Ag and 3% Ag modified Mn3O4 nanoparticles, respectively.
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Affiliation(s)
- Sajid Khan
- School of Science, Minzu University of China, Beijing, 100081, China; Department of Physics, COMSATS University Islamabad, Park Road, Chak Shahzad, Islamabad, 45550, Pakistan
| | - Asghar Hussain
- Department of Physics, COMSATS University Islamabad, Park Road, Chak Shahzad, Islamabad, 45550, Pakistan
| | - Kexin He
- School of Science, Minzu University of China, Beijing, 100081, China
| | - Bingxue Liu
- School of Science, Minzu University of China, Beijing, 100081, China
| | - Zahid Imran
- Department of Physics, COMSATS University Islamabad, Park Road, Chak Shahzad, Islamabad, 45550, Pakistan
| | - Jaweria Ambreen
- Department of Chemistry, COMSATS University Islamabad, Park Road, Chak Shahzad, 45550, Islamabad, Pakistan
| | - Safia Hassan
- Department of Chemistry, COMSATS University Islamabad, Park Road, Chak Shahzad, 45550, Islamabad, Pakistan
| | - Mushtaq Ahmad
- Department of Physics, COMSATS University Islamabad, Park Road, Chak Shahzad, Islamabad, 45550, Pakistan
| | - Syeda Sitwat Batool
- School of Science, Minzu University of China, Beijing, 100081, China; Department of Physics, COMSATS University Islamabad, Park Road, Chak Shahzad, Islamabad, 45550, Pakistan.
| | - Chuanbo Li
- School of Science, Minzu University of China, Beijing, 100081, China; Optoelectronics Research Centre, Minzu University of China, Beijing, 100081, China.
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Jamila GS, Sajjad S, Leghari SAK, Long M. Nitrogen doped carbon quantum dots and GO modified WO 3 nanosheets combination as an effective visible photo catalyst. J Hazard Mater 2020; 382:121087. [PMID: 31476720 DOI: 10.1016/j.jhazmat.2019.121087] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2019] [Revised: 08/20/2019] [Accepted: 08/22/2019] [Indexed: 06/10/2023]
Abstract
Nitrogen doped carbon quantum dots (NCQDs) based highly efficient ternary photocatalyst are fabricated by modifying surface of GO incorporated WO3 nano-sheets. XRD confirmed the formation of monoclinicWO3 nano-sheets. All the characteristic peaks of WO3, GO and NCQDs are obvious in XRD patterns of WO3/GO/NCQDs ternary photocatalysts confirming successful fabrication of the photocatalysts. SEM images showed that WO3 host matrix is distorted after incorporation of GO and NCQDs owing to lower interfacial tension. The surface of WO3 nano-sheets is modified with morphological defects making more active sites available. UV-vis spectra exhibited extended visible light absorption and remarkable reduction of WO3 band gap energy. The photoluminescence spectra confirmed the efficient charge separation in NCQDs modified ternary photocatalyst. The synthesized composites were applied for the photocatalytic degradation of harmful organic dye i.e. methyl orange (MO). The ternary composites represented the excellent photocatalytic activity as compared to binary and pure WO3 photocatalysts. This enhanced photocatalytic activity is attributed to the availability of active sites, extended light absorption in visible region and enhanced charge separation efficiency.
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Affiliation(s)
| | | | | | - Mingce Long
- School of Environmental Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China
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Jayaraman V, Sarkar D, Rajendran R, Palanivel B, Ayappan C, Chellamuthu M, Mani A. Synergistic effect of band edge potentials on BiFeO 3/V 2O 5 composite: Enhanced photo catalytic activity. J Environ Manage 2019; 247:104-114. [PMID: 31234045 DOI: 10.1016/j.jenvman.2019.06.041] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 05/21/2019] [Accepted: 06/08/2019] [Indexed: 06/09/2023]
Abstract
The BiFeO3/V2O5 has been successfully synthesized by simple annealing of BiFeO3 nanoplates and V2O5 nanoflower. The phase, structural, optical properties and chemical state of the BiFeO3, V2O5 and different composition of BiFeO3/V2O5 samples were comparatively characterized by various spectroscopic and microscopic techniques. The prepared catalyst exhibits unique photo catalytic and post-oxidation/reduction ability for removal of various (MB, Phenol, CV, RhB) water organic pollutants. Compared to pure BiFeO3 and V2O5, the different Wt % of BiFeO3/V2O5 composition exhibited higher photo catalytic activity. The fortunate BiFeO3/V2O5 interface hybrid photo catalyst makes a significant impact in the enhancement of photo catalytic reaction. This remarkable efficiency could be ascribed to the synergistic effect between the V2O5 petals and BiFeO3 plates. The exceptional morphology, increased surface area, uniformity, less-agglomerated spreading could increase the ability of visible light response, which lead the improved electron transport ability and the higher charge separation. The enhanced rate of photo generated charge carriers separations were evinced by the EIS and PL spectrum measurements. The allowed radical trapping experiment divulge that the hole (h+), and super oxide radical (O2-) are the minimized effect in degradation, on the other hand hydroxyl radical (OH) is plays the foremost role and act as the active radicals in the catalytic organism. In relations of above investigation, a probable photo degradation mechanism of the as-synthesized photo catalyst is carefully explicated. This effort delivers an effective approach to design and fabricate the efficient photo catalyst through integrating of materials, which has a potential for industrial waste water purification.
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Affiliation(s)
- Venkatesan Jayaraman
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram, 603203, Tamil Nadu, India
| | - Debabrata Sarkar
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram, 603203, Tamil Nadu, India
| | - Ranjith Rajendran
- Advanced Materials Laboratory, Department of Physics, Periyar University, Salem, 636 011, Tamilnadu, India
| | - Baskaran Palanivel
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram, 603203, Tamil Nadu, India
| | - Chinnadurai Ayappan
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram, 603203, Tamil Nadu, India
| | - Muthamizhchelvan Chellamuthu
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram, 603203, Tamil Nadu, India
| | - Alagiri Mani
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram, 603203, Tamil Nadu, India.
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Tighe-Neira R, Carmora E, Recio G, Nunes-Nesi A, Reyes-Diaz M, Alberdi M, Rengel Z, Inostroza-Blancheteau C. Metallic nanoparticles influence the structure and function of the photosynthetic apparatus in plants. Plant Physiol Biochem 2018; 130:408-417. [PMID: 30064097 DOI: 10.1016/j.plaphy.2018.07.024] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 07/17/2018] [Accepted: 07/18/2018] [Indexed: 06/08/2023]
Abstract
The applications of nanoparticles continue to expand into areas as diverse as medicine, bioremediation, cosmetics, pharmacology and various industries, including agri-food production. The widespread use of nanoparticles has generated concerns given the impact these nanoparticles - mostly metal-based such as CuO, Ag, Au, CeO2, TiO2, ZnO, Co, and Pt - could be having on plants. Some of the most studied variables are plant growth, development, production of biomass, and ultimately oxidative stress and photosynthesis. A systematic appraisal of information about the impact of nanoparticles on these processes is needed to enhance our understanding of the effects of metallic nanoparticles and oxides on the structure and function on the plant photosynthetic apparatus. Most nanoparticles studied, especially CuO and Ag, had a detrimental impact on the structure and function of the photosynthetic apparatus. Nanoparticles led to a decrease in concentration of photosynthetic pigments, especially chlorophyll, and disruption of grana and other malformations in chloroplasts. Regarding the functions of the photosynthetic apparatus, nanoparticles were associated with a decrease in the photosynthetic efficiency of photosystem II and decreased net photosynthesis. However, CeO2 and TiO2 nanoparticles may have a positive effect on photosynthetic efficiency, mainly due to an increase in electron flow between the photosystems II and I in the Hill reaction, as well as an increase in Rubisco activity in the Calvin and Benson cycle. Nevertheless, the underlying mechanisms are poorly understood. The future mechanistic work needs to be aimed at characterizing the enhancing effect of nanoparticles on the active generation of ATP and NADPH, carbon fixation and its incorporation into primary molecules such as photo-assimilates.
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Affiliation(s)
- Ricardo Tighe-Neira
- Programa de Doctorado en Ciencias Agropecuarias, Facultad de Recursos Naturales, Universidad Católica de Temuco, P.O. Box 15-D, Temuco, Chile; Departamento de Ciencias Agropecuarias y Acuícolas, Facultad de Recursos Naturales, Universidad Católica de Temuco, P.O. Box 15-D, Temuco, Chile
| | - Erico Carmora
- Núcleo de Investigación en Bioproductos y Materiales Avanzados, Facultad de Ingeniería, Universidad Católica de Temuco, P.O. Box 15-D, Temuco, Chile
| | - Gonzalo Recio
- Núcleo de Investigación en Bioproductos y Materiales Avanzados, Facultad de Ingeniería, Universidad Católica de Temuco, P.O. Box 15-D, Temuco, Chile
| | - Adriano Nunes-Nesi
- Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Minas Gerais, 36570-900, Viçosa, Brazil
| | - Marjorie Reyes-Diaz
- Departamento de Ciencias Químicas y Recursos Naturales, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, P.O. Box 54-D, Temuco, Chile; Center of Plant, Soil Interaction and Natural Resources Biotechnology, Scientific and Technological Bioresource Nucleus (BIOREN), Universidad de La Frontera, P.O. Box 54-D, Temuco, Chile
| | - Miren Alberdi
- Departamento de Ciencias Químicas y Recursos Naturales, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, P.O. Box 54-D, Temuco, Chile; Center of Plant, Soil Interaction and Natural Resources Biotechnology, Scientific and Technological Bioresource Nucleus (BIOREN), Universidad de La Frontera, P.O. Box 54-D, Temuco, Chile
| | - Zed Rengel
- Soil Science and Plant Nutrition, UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, 6009, Australia
| | - Claudio Inostroza-Blancheteau
- Departamento de Ciencias Agropecuarias y Acuícolas, Facultad de Recursos Naturales, Universidad Católica de Temuco, P.O. Box 15-D, Temuco, Chile; Núcleo de Investigación en Producción Alimentaria, Facultad de Recursos Naturales, Universidad Católica de Temuco, P.O. Box 15-D, Temuco, Chile.
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Sivagami K, Vikraman B, Krishna RR, Swaminathan T. Chlorpyrifos and Endosulfan degradation studies in an annular slurry photo reactor. Ecotoxicol Environ Saf 2016; 134:327-331. [PMID: 26560434 DOI: 10.1016/j.ecoenv.2015.08.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 07/30/2015] [Accepted: 08/15/2015] [Indexed: 05/11/2023]
Abstract
TiO2 is one of those compounds which are highly used in photocatalytic degradation of substrates using UV radiation. The substrates are degraded oxidatively and hence finds an important position in advanced oxidation for water/wastewater treatment processes. The thrust of this research was to evaluate the effectiveness of Heterogeneous Photocatalysis (HP) technique, for the removal of pesticides from water/wastewater. The photo-catalytic degradation of two pesticides, widely used in India, viz., Endosulfan (ES) and Chlorpyriphos (CPS) was studied in an annular slurry photo reactor under UVillumination at 254nm. Results revealed that the degradation rate is significantly affected by the initial pesticide concentration, pH of the solution and catalyst concentration. Batch degradation studies on Endosulphan and Chlorpyrifos were conducted in the concentration range from 5 to 25mg/L at a pH ranging from 3.5 to 10.5 and at a catalyst loading of 0.5-2g/L. Endosulphan removal efficiency was about 80-99% and chlorpyrifos removal efficiency was about 84-94%. L-H rate constants were determined using L-H kinetics. High removal efficiencies obtained (80-99%) indicate the effectiveness of this process and its potential for practical application.
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Affiliation(s)
- K Sivagami
- Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai 600036, India.
| | - B Vikraman
- Department of Chemical Engineering, Sri Venkateswara College of Engineering,, Sriperumpudur Sriperumpudur, India
| | - R Ravi Krishna
- Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
| | - T Swaminathan
- Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
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Balachandran K, Venckatesh R, Sivaraj R, Rajiv P. TiO2 nanoparticles versus TiO2-SiO2 nanocomposites: a comparative study of photo catalysis on acid red 88. Spectrochim Acta A Mol Biomol Spectrosc 2014; 128:468-474. [PMID: 24682063 DOI: 10.1016/j.saa.2014.02.127] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Revised: 02/01/2014] [Accepted: 02/19/2014] [Indexed: 06/03/2023]
Abstract
A novel, simple, less time-consuming and cost-effective wet chemical technique was used to synthesis TiO2 nanoparticles and TiO2-SiO2 nanocomposites using Titanium tetra isopropoxide (TTIP) as a precursor relatively at low temperature in acidic pH. Titania sol was prepared by hydrolysis of TTIP and was mixed with silicic acid and tetrahydrofuran mixture. The reaction was carried out under vigorous stirring for 6h and dried at room temperature. The resulting powders were characterized by UV-Visible spectroscopy, Fourier transform infrared (FT-IR), X-ray diffraction, scanning electron microscope (SEM) and transmission electron microscope (TEM). The grain size of the particles was calculated by X-ray diffraction, surface morphology and chemical composition was determined from scanning electron microscopy-energy dispersive spectroscopy, metal oxide stretching was confirmed from FT-IR spectroscopy, band gap was calculated using UV-Visible spectroscopy. Surface area of the composite as calculated by BET analyzer and it was found to be 65 and 75 m(2)/g for TiO2 and TiO2-SiO2 respectively. The photocatalytic experiments were performed with aqueous solution of acid red 88 with TiO2 and TiO2-SiO2 batch studies for 4h irradiation, direct photolysis of TiO2 and TiO2-SiO2 contributed 94.2% and 96.5% decomposition in solar radiation for the optimized concentration of acid red 88.
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Affiliation(s)
- K Balachandran
- Department of Chemistry, Vivekanandha College of Engineering for women, Namakkal, Tamil Nadu, India
| | - Rajendran Venckatesh
- Department of Chemistry, Government Arts College, Udumalpet 642 126, Tamil Nadu, India.
| | - Rajeshwari Sivaraj
- Department of Biotechnology, School of Life Sciences, Karpagam University, Eachanari Post, Coimbatore 641 021, Tamil Nadu, India
| | - P Rajiv
- Department of Biotechnology, School of Life Sciences, Karpagam University, Eachanari Post, Coimbatore 641 021, Tamil Nadu, India
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