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Sarkar N, Mishra SR, Gadore V, Panigrahi B, Ahmaruzzaman M. Nanocosmos of catalysis: a voyage through synthesis, properties, and enhanced photocatalytic degradation in nickel sulfide nanocomposites. NANOSCALE ADVANCES 2024; 6:2741-2765. [PMID: 38817430 PMCID: PMC11134246 DOI: 10.1039/d4na00184b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Accepted: 04/06/2024] [Indexed: 06/01/2024]
Abstract
Nanomaterials play a decisive role in environmental applications such as water purification, pollutant monitoring, and advanced oxidation-based remediation processes, particularly in semiconductor and metal sulfide-based photocatalysis. Metal sulfides are ideal for photocatalysis because of their unique optical, structural, and electronic characteristics. These properties enable the effective use of solar energy to drive various catalytic reactions with potential uses in environmental remediation with sustainable energy production. Among them, nickel sulfides (NiS) stand out for their narrow band gaps, high stability, and cost-effectiveness. This review thoroughly analyzes recent advancements in employing nickel-sulfide-based nanostructures for water decontamination. It begins by addressing environmental material needs and emphasizing the properties of nickel sulfide. To improve photocatalytic performance, controlled processes that affect the active structure, shape, composition, and size of nickel sulfide photocatalysts are examined, along with their synthesis methods. The heart of the review article is a detailed analysis of the modification of NiS through metal and non-metal doping, heterojunction, and nanocomposite formation for enhanced photocatalytic performance. The discussion also includes metal-modified nanostructures, metal oxides, and carbon-hybridized nanocomposites. This study underscores notable advancements in the degradation efficiency of NiS photocatalysts, rivaling their costly noble-metal counterparts. The analysis concludes with potential future directions for nickel sulfide-based photocatalysts in sustainable environmental remediation.
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Affiliation(s)
- Nityananda Sarkar
- Department of Chemistry, National Institute of Technology Silchar Assam 788010 India
| | - Soumya Ranjan Mishra
- Department of Chemistry, National Institute of Technology Silchar Assam 788010 India
| | - Vishal Gadore
- Department of Chemistry, National Institute of Technology Silchar Assam 788010 India
| | - Biswaranjan Panigrahi
- Department of Chemistry, National Institute of Technology Silchar Assam 788010 India
| | - Md Ahmaruzzaman
- Department of Chemistry, National Institute of Technology Silchar Assam 788010 India
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Tong H, Shi D, Huang J, Xu S, Fu K, Wen X, Xie H, Liu J, Cai H, Xu X. Resource utilization of MSWI fly ash supporting TiO 2/BiOCl nanocomposite for enhanced photocatalytic degradation of sodium isopropyl xanthate: Mechanism and performance evaluation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 359:120987. [PMID: 38692029 DOI: 10.1016/j.jenvman.2024.120987] [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: 02/11/2024] [Revised: 03/24/2024] [Accepted: 04/20/2024] [Indexed: 05/03/2024]
Abstract
The removal of organic pollutants in water environments and the resource utilization of solid waste are two pressing issues around the world. Facing the increasing pollution induced by discharge of mining effluents containing sodium isopropyl xanthate (SIPX), in this work, municipal solid waste incineration fly ash (MSWI FA) was pretreated by hydrothermal method to produce stabilized FA, which was then innovatively used as support for the construction of FA/TiO2/BiOCl nanocomposite (FTB) with promoted photocatalytic activity under visible light and natural sunlight. When the content of FA was 20 wt% and the mass ratio of TiO2 to BiOCl was 4:6, a remarkable performance for the optimal FTB (20-FTB-2) was achieved. Characterizations demonstrated that TiO2 and BiOCl uniformly dispersed on FA contributing to high surface area and broad light adsorption of FTB, which exhibits excellent adsorption capacity and light response ability. Build in electric field formed in the interface of TiO2/BiOCl heterojunction revealed by density functional theory calculations accelerated the separation of photoinduced e- and h+, leading to high efficiency for SIPX degradation. The synergetic effect combined with adsorption and photocatalytic degradation endowed 20-FTB-2 superior SIPX removal efficiency over 99% within 30 min under visible light and natural sunlight irradiation. The photocatalytic degradation pathways of SIPX were determined through theoretical calculations and characterizations, and the toxic byproduct CS2 was effectively eliminated through oxidation of •O2-. For 20-FTB-2, reusability of photocatalyst was showed by cycle tests, also the concentrations of main heavy metals (Pb, Zn, Cu, Cr, and Cd) in the liquid phases released during photocatalyst preparation process (< 1 mg/L) and photodegradation process (< 8.5 μg/L) proved the satisfactory stability with low toxicity. This work proposed a novel strategy to develop efficient and stable support-based photocatalysts by utilizing MSWI FA and realize its resource utilization.
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Affiliation(s)
- Haihang Tong
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China; School of Energy and Environment, City University of Hong Kong, Kowloon Tong, Hong Kong, 999077, PR China
| | - Dezhi Shi
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China.
| | - Jie Huang
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China
| | - Shuo Xu
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China
| | - Kun Fu
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China
| | - Xianyi Wen
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China
| | - Hui Xie
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China
| | - Jiayu Liu
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China
| | - Huayi Cai
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China
| | - Xiaoyi Xu
- College of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215000, PR China
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Gadore V, Singh AK, Mishra SR, Ahmaruzzaman M. RSM approach for process optimization of the photodegradation of congo red by a novel NiCo 2S 4/chitosan photocatalyst. Sci Rep 2024; 14:1118. [PMID: 38212420 PMCID: PMC10784554 DOI: 10.1038/s41598-024-51618-2] [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: 10/11/2023] [Accepted: 01/08/2024] [Indexed: 01/13/2024] Open
Abstract
The current study reported a facile co-precipitation technique for synthesizing novel NiCo2S4/chitosan nanocomposite. The photocatalytic activity of the prepared nanocomposite was evaluated using congo red (CR) dye as a target pollutant. The central composite design was employed to examine the impact of different reaction conditions on CR dye degradation. This study selected the pH, photocatalyst loading, initial CR concentration and reaction time as reaction parameters, while the degradation efficiency (%) was selected as the response. A desirability factor of 1 suggested the adequacy of the model. Maximum degradation of 93.46% of 35 ppm dye solution was observed after 60 min of visible light irradiation. The response to surface methodology (RSM) is a helpful technique to predict the optimum reaction conditions of the photodegradation of CR dye. Moreover, NiCo2S4/Ch displayed high recyclability and reusability up to four consecutive cycles. The present study suggests that the prepared NiCo2S4/chitosan nanocomposite could prove to be a viable photocatalyst for the treatment of dye-contaminated wastewater.
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Affiliation(s)
- Vishal Gadore
- Department of Chemistry, National Institute of Technology Silchar, Silchar, Assam, 788010, India
| | - Ashish Kumar Singh
- Department of Chemistry, National Institute of Technology Silchar, Silchar, Assam, 788010, India
| | - Soumya Ranjan Mishra
- Department of Chemistry, National Institute of Technology Silchar, Silchar, Assam, 788010, India
| | - Md Ahmaruzzaman
- Department of Chemistry, National Institute of Technology Silchar, Silchar, Assam, 788010, India.
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Zahra M, Yasmeen G, Aftab F, Athar HUR, Saleem A, Ambreen S, Malana MA. ZnSe-rGO nanocomposites as photocatalysts for purification of textile dye contaminated water: A green approach to use wastewater for maize cultivation. Heliyon 2023; 9:e22687. [PMID: 38046153 PMCID: PMC10687704 DOI: 10.1016/j.heliyon.2023.e22687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 11/16/2023] [Accepted: 11/16/2023] [Indexed: 12/05/2023] Open
Abstract
Disputes about the probable availability of safe water and the efficacy of processed wastewater are key issues that necessitate a suitable solution to enhance the quality of clean water. The current research emphasizes the synthesis of ZnSe-reduced graphene oxide nanocomposites (ZnSe:rGO) with different weight ratios of rGO (represented as X = 0.6, 1 and 1.6 g)via one-step hydrothermal method. The photocatalytic performance for the degradation of methyl violet (MV) dye was investigated under visible light irradiation by varying the reaction parameters. The crystal structure, elemental composition, surface functionality and morphology of the synthesized ZnSe-XrGO nanocomposites were estimated by powder X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopic (SEM) techniques. UV-visible spectroscopy was used to investigate the optical properties. The highest efficiency is obtained for ZnSe-XrGO in 1:1 and it showed pseudo 1st order behavior with rate constant of 0.0167min-1and 94 % photodegradation of MV in just 3 h. Furthermore, hazardous effects of MV were investigated on the germination and growth of Zea mays seeds by giving them aqueous solution of MV (0, 8, 12, 24 and 48 ppm) and the decontaminated water after photodegradation of MV with the synthesized photoactive composite. The results showed profound negative effect on both germination and seedling growth at higher concentration (>12 ppm) of the dye solution. No hazardous effects were observed on both these parameters when it was given the dye degraded water which reflects the practical use of the synthesized catalyst for water remediation. The current study fulfills the goal of designing an efficient visible-light active nano-photocatalyst and its direct applicability on life sciences for water purification.
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Affiliation(s)
- Mishal Zahra
- Physical Research Laboratory, Institute of Chemical Sciences, Bahauddin Zakriya University Multan, Punjab, Pakistan
| | - Ghazala Yasmeen
- Physical Research Laboratory, Institute of Chemical Sciences, Bahauddin Zakriya University Multan, Punjab, Pakistan
| | - Faryal Aftab
- Department of Chemistry, The Women University Multan, Punjab, Pakistan
| | | | - Aisha Saleem
- Institute of Botany, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Sarah Ambreen
- Institute of Botany, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Muhammad Aslam Malana
- Physical Research Laboratory, Institute of Chemical Sciences, Bahauddin Zakriya University Multan, Punjab, Pakistan
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Ahmed DA, El-Apasery MA, Ragai SM. Development of an antimicrobial inorganic polymer based on fly ash and metakaolin incorporated by nano-TiO 2 for reactive dye removal. Sci Rep 2023; 13:19889. [PMID: 37964022 PMCID: PMC10645941 DOI: 10.1038/s41598-023-47032-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 11/08/2023] [Indexed: 11/16/2023] Open
Abstract
Advanced and eco-friendly construction materials are being developed to reduce pollution and improve wastewater treatment efficiency. One such material is a photocatalytic nanocomposite that uses industrial wastes and natural substances to eliminate pollution. A recent study explored using an inorganic polymer composite (FM) made from a mixture of 70% fly ash and 30% metakaolin, with sodium hydroxide and sodium silicate as an alkali activator. The study evaluated the mechanical and hydration characteristics of the FM composite after 28 days in 100% humidity at room temperature. The study also examined the effect of adding 2.5 wt.% of Nano-TiO2 to FM composite and how it affects its properties. Results indicate that adding Nano-TiO2 to FM composite enhances its mechanical, antibacterial, and photocatalytic capabilities. Specifically, FM-TiO2 composite showed 90% removal of reactive blue 19 dye effluent in sunlight after 90 min, making it an excellent choice for sustainable wastewater treatment. This study presents a cost-effective, eco-friendly solution to wastewater treatment, with added antimicrobial properties from Nano-TiO2.
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Affiliation(s)
- Doaa A Ahmed
- Chemistry Department, Faculty of Women for Arts, Science and Education, Ain Shams University, Cairo, 11757, Egypt.
| | - Morsy A El-Apasery
- Dyeing, Printing and Textile Auxiliaries Department, Textile Research and Technology Institute, National Research Centre, 33 El Buhouth St, Cairo, 12622, Egypt
| | - Shereen M Ragai
- Chemistry Department, Faculty of Women for Arts, Science and Education, Ain Shams University, Cairo, 11757, Egypt
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Gadore V, Mishra SR, Ahmaruzzaman M. Metal sulphides and their heterojunctions for photocatalytic degradation of organic dyes-A comprehensive review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:90410-90457. [PMID: 37474851 DOI: 10.1007/s11356-023-28753-w] [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: 03/08/2023] [Accepted: 07/08/2023] [Indexed: 07/22/2023]
Abstract
Water pollution caused by organic dyes is one of the greatest threats to the ecosystem. The removal of dyes from water has remained a challenge for scientists. Recently, metal sulphides have emerged as a potential candidate for water remediation applications. The efficient charge transportation, greater surface-active sites, and low bandgap of metal sulphides make them an excellent choice of semiconductor photocatalysts for degradation of dyes. This review summarises the potential application of metal sulphides and their heterojunctions for the photocatalytic degradation of organic dyes from wastewater. A detailed study has been presented on the synthesis, basics of photodegradation and heterojunctions and photocatalytic activity. The effect of the use of templates, doping agents, synthesis route, and various other factors affecting the photocatalytic activity of metal sulphides have been summarised in this review. The synthesis techniques, characterisation techniques, mechanism of degradation of organic dyes by Z-scheme heterojunction photocatalyst, reusability and stability of metal sulphides, and the scope of future research are also discussed. This study indicates that Scopus-based core gathered data could be used to give an objective overview of the global dye degradation research from 2008 to 2023 (15 years). All data (articles, authors, keywords, and publications) is compiled in the Scopus database. For the bibliometric study, 1962 papers relevant to dye photodegradation by sulfide-based photocatalysts were found, and this number rises yearly. A bibliometric analysis provides a 15-year evaluation of the state-of-the-art research on the impact of metal sulfide-based photocatalysts on the photodegradation of dyes.
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Affiliation(s)
- Vishal Gadore
- Department of Chemistry, National Institute of Technology Silchar, 788010, Silchar, Assam, India
| | - Soumya Ranjan Mishra
- Department of Chemistry, National Institute of Technology Silchar, 788010, Silchar, Assam, India
| | - Md Ahmaruzzaman
- Department of Chemistry, National Institute of Technology Silchar, 788010, Silchar, Assam, India.
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Gadore V, Mishra SR, Ahmaruzzaman M. Bio-inspired sustainable synthesis of novel SnS 2/biochar nanocomposite for adsorption coupled photodegradation of amoxicillin and congo red: Effects of reaction parameters, and water matrices. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 334:117496. [PMID: 36801688 DOI: 10.1016/j.jenvman.2023.117496] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 02/03/2023] [Accepted: 02/10/2023] [Indexed: 06/18/2023]
Abstract
This study aims to fabricate a novel integrated photocatalytic adsorbent (IPA) via a green solvothermal process employing tea (Camellia sinensis var. assamica) leaf extract as a stabilizing and capping agent for the removal of organic pollutants from wastewater. An n-type semiconductor photocatalyst, SnS2, was chosen as a photocatalyst due to its remarkable photocatalytic activity supported over areca nut (Areca catechu) biochar for the adsorption of pollutants. The adsorption and photocatalytic properties of fabricated IPA were examined by taking amoxicillin (AM) and congo red (CR) as two emerging pollutants found in wastewater. Investigating synergistic adsorption and photocatalytic properties under varying reaction conditions mimicking actual wastewater conditions marks the novelty of the present research. The support of biochar for the SnS2 thin films induced a reduction in charge recombination rate, which enhanced the photocatalytic activity of the material. The adsorption data were in accordance with the Langmuir nonlinear isotherm model, indicating monolayer chemosorption with the pseudo-second-order rate kinetics. The photodegradation process follows pseudo-first-order kinetics with the highest rate constant of 0.0450 min-1 for AM and 0.0454 min-1 for CR. The overall removal efficiency of 93.72 ± 1.19% and 98.43 ± 1.53% could be achieved within 90 min for AM and CR via simultaneous adsorption and photodegradation model. A plausible mechanism of synergistic adsorption and photodegradation of pollutants is also presented. The effect of pH, Humic acid (HA) concentration, inorganic salts and water matrices have also been included.The photodegradation activity of SnS2 under visible light coupled with the adsorption capability of the biochar results in the excellent removal of the contaminants from the liquid phase.
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Affiliation(s)
- Vishal Gadore
- Department of Chemistry, National Institute of Technology Silchar, 788010, Assam, India
| | - Soumya Ranjan Mishra
- Department of Chemistry, National Institute of Technology Silchar, 788010, Assam, India
| | - Md Ahmaruzzaman
- Department of Chemistry, National Institute of Technology Silchar, 788010, Assam, India.
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Gadore V, Mishra SR, Ahmaruzzaman M. One-pot synthesis of CdS/CeO 2 heterojunction nanocomposite with tunable bandgap for the enhanced advanced oxidation process. Sci Rep 2023; 13:7708. [PMID: 37173397 PMCID: PMC10182039 DOI: 10.1038/s41598-023-34742-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 05/06/2023] [Indexed: 05/15/2023] Open
Abstract
Herein, a binary nanocomposite CdS/CeO2 has been fabricated via a one-pot co-precipitation method for the degradation of Rose Bengal (RB) dye. The structure, surface morphology, composition, and surface area of the prepared composite were characterized by transmission electron microscopy, scanning electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, Brunaur-Emmett-Teller analysis UV-Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The prepared CdS/CeO2(1:1) nanocomposite has a particle size of 8.9 ± 0.3 nm and a surface area of 51.30 m2/g. All the tests indicated the agglomeration of CdS nanoparticles over the surface of CeO2. The prepared composite showed excellent photocatalytic activity in the presence of hydrogen peroxide under solar irradiation towards the degradation of Rose Bengal. Near to about complete degradation of 190 ppm of RB dye could be achieved within 60 min under optimum conditions. The enhanced photocatalytic activity was attributed to the delayed charge recombination rate and a lower bandgap of the photocatalyst. The degradation process was found to follow pseudo-first-order kinetics with a rate constant of 0.05824 min-1. The prepared sample showed excellent stability and reusability and maintained about 87% of the photocatalytic efficiency till the fifth cycle. A plausible mechanism for the degradation of the dye is also presented based on the scavenger experiments.
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Affiliation(s)
- Vishal Gadore
- Department of Chemistry, National Institute of Technology Silchar, Silchar, Assam, 788010, India
| | - Soumya Ranjan Mishra
- Department of Chemistry, National Institute of Technology Silchar, Silchar, Assam, 788010, India
| | - Md Ahmaruzzaman
- Department of Chemistry, National Institute of Technology Silchar, Silchar, Assam, 788010, India.
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Dey AK, Mishra SR, Ahmaruzzaman M. Solar light-based advanced oxidation processes for degradation of methylene blue dye using novel Zn-modified CeO 2@biochar. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:53887-53903. [PMID: 36867337 DOI: 10.1007/s11356-023-26183-2] [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: 10/07/2022] [Accepted: 02/24/2023] [Indexed: 06/19/2023]
Abstract
Herein, a novel nanocomposite, namely, Zn-modified CeO2@biochar (Zn/CeO2@BC), is synthesized via facile one-step sol-precipitation to study its photocatalytic activity towards the removal of methylene blue dye. Firstly, Zn/Ce(OH)4@biochar was precipitated by adding sodium hydroxide to cerium salt precursor; then, the composite was calcined in a muffle furnace to convert Ce(OH)4 into CeO2. The crystallite structure, topographical and morphological properties, chemical compositions, and specific surface area of the synthesized nanocomposite are characterized by XRD, SEM, TEM, XPS, EDS, and BET analysis. The nearly spherical Zn/CeO2@BC nanocomposite has an average particle size of 27.05 nm and a specific surface area of 141.59 m2/g. All the tests showed the agglomeration of Zn nanoparticles over the CeO2@biochar matrix. The synthesized nanocomposite showed remarkable photocatalytic activity towards removing methylene blue, an organic dye commonly found in industrial effluents. The kinetics and mechanism of Fenton-activated dye degradation were studied. The nanocomposite exhibited the highest degradation efficiency of 98.24% under direct solar irradiation of 90 min, at an optimum dosage of 0.2 g l-1 catalyst and 10 ppm dye concentration, in the presence of 25% (V/V) 0.2 ml (4 µl/ml) hydrogen peroxide. The hydroxyl radical generated from H2O2 during the photo-Fenton reaction process was attributed to the nanocomposite's improved photodegradation performance. The degradation process followed pseudo-first-order kinetics having a rate constant (k) value of 0.0274 min-1.
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Affiliation(s)
- Akshay Kumar Dey
- Department of Chemistry, National Institute of Technology, Silchar, 788010, Assam, India
| | - Soumya Ranjan Mishra
- Department of Chemistry, National Institute of Technology, Silchar, 788010, Assam, India
| | - Md Ahmaruzzaman
- Department of Chemistry, National Institute of Technology, Silchar, 788010, Assam, India.
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Lourdusamy VJK, Thomas MRN, Subramani S. Effluent degradation followed hydrogen production using near-infrared sensitized nanocomposite of reduced nanographene oxide under visible light. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:18113-18122. [PMID: 36205875 DOI: 10.1007/s11356-022-23427-5] [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: 05/23/2022] [Accepted: 09/29/2022] [Indexed: 06/16/2023]
Abstract
The purpose of this research work is to synthesize near-infrared dye-sensitized nanocomposites with core-shell nanostructures of titanium dioxide/reduced nanographene oxide (TiO2/r-NGO) to be an effective photocatalyst for effluent degradation followed hydrogen generation under visible light irradiation. The generation of hydrogen using photocatalysts has been intensely researched for the effective utilization of hydrogen in a controlled way. The mechanistic pathway for both hydrogen generation and effluent degradation utilizes the electrons generated through photoexcitation during dye sensitization. For this reason, the squaraine dyes were synthesized by the C-H-direct arylation method and made the nanocomposites with self-assembled core/shell nanocomposites (r-NGOT), where TiO2 serves as the core and r-NGO as the shell. Due to the lack of anchoring groups, VJ-Q was only adsorbed on the surface of r-NGOT through π-π stacking, which is confirmed by Fourier transformed-infrared spectroscopy, X-ray photoelectron spectroscopy, high resolution-transmission electron microscopy, and electron energy loss spectroscopy. The optical absorption spectra of VJ-Q/r-NGOT nanocomposites measured with diffuse reflectance UV/visible absorption spectroscopy covers the whole range of visible light wavelengths up to 800 nm. During the photocatalytic activity, VJ-Q/r-NGOT/Pt followed a ligand-to-metal-charge transfer (LMCT) type mechanism for the electron transfer to the core-shell nanostructure. This mechanistic pathway is utilized for the effluent dye degradation followed hydrogen generation through water splitting. The photocatalytic efficiency of the nanocomposite with adsorbed dye is superior to that of dye-TiO2 due to the large surface area provided by r-NGO and the prevention of dye aggregation. The work is significant due to the limited research works that are carried under dye-sensitized nanocomposites that have been utilized for both dye degradation and hydrogen generation.
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Affiliation(s)
| | - Mary Rosana Nalzala Thomas
- Department of Chemical Engineering, Rajalakshmi Engineering College (Autonomous), Thandalam, Chennai, 602 105, Tamil Nadu, India
| | - Sekar Subramani
- Department of Mechanical Engineering, Rajalakshmi Engineering College (Autonomous), Thandalam, Chennai, 602 105, Tamil Nadu, India
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Singh DK, Singh A, Gacem A, Kashyap S, Yadav VK, Yadav KK, Hussein HS, Shukla NK, Alsuhaibani AM, Abdellattif MH, Lee C, Lee W, Modi T, Jeon BH. Multiple Site Dissimilarities of Herbaceous Species Due to Coal Fly Ash Dumping Based Soil Heavy Metal Toxication. TOXICS 2023; 11:90. [PMID: 36850966 PMCID: PMC9968134 DOI: 10.3390/toxics11020090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 01/13/2023] [Accepted: 01/15/2023] [Indexed: 06/18/2023]
Abstract
The present study analyzes the determinants and patterns of the regional, local, and differential plant diversity of two different sites with similar climatic but varied edaphic factors. This research was undertaken to study the plant diversity and population structure as a consequence of variation in the soil quality between two biotopes: Guru Ghasidas Vishwavidyalaya in Koni (site-I) and National Thermal Power Corporation in Sipat (site-II). The soil of site-I was found to be fertile and showed rich vegetation. On the other hand, the soil of site II was found to be contaminated with heavy metals, which impacts the flora of the region. The ecology of both sites was studied, and their quantitative and qualitative aspects were compared and contrasted. The abundance, density, and richness of the plants in site II were fairly lower than in site-I, which was confirmed by utilizing Simpson's and Shannon's diversity indices. Many of the species collected from site II were heavy metal accumulators and could also serve as indicators of heavy metal toxicity.
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Affiliation(s)
- Deepak Kumar Singh
- Department of Botany, Guru Ghasidas Vishwavidyalaya, Bilaspur 495001, Chhattisgarh, India
| | - Anushka Singh
- Department of Botany, Guru Ghasidas Vishwavidyalaya, Bilaspur 495001, Chhattisgarh, India
| | - Amel Gacem
- Department of Physics, Faculty of Sciences, University 20 Août 1955, Skikda 21000, Algeria
| | - Shruti Kashyap
- Department of Botany, Guru Ghasidas Vishwavidyalaya, Bilaspur 495001, Chhattisgarh, India
| | - Virendra Kumar Yadav
- Department of Biosciences, School of Liberal Arts & Sciences, Mody University of Science and Technology, Lakshmangarh, Sikar 332311, Rajasthan, India
| | - Krishna Kumar Yadav
- Faculty of Science and Technology, Madhyanchal Professional University, Ratibad 462044, Bhopal, India
| | - Hany S. Hussein
- Electrical Engineering Department, Faculty of Engineering, King Khalid University, Abha 61411, Saudi Arabia
- Electrical Engineering Department, Faculty of Engineering, Aswan University, Aswan 81528, Egypt
| | - Neeraj Kumar Shukla
- Electrical Engineering Department, College of Engineering, King Khalid University, Abha 61421, Saudi Arabia
| | - Amnah Mohammed Alsuhaibani
- Department of Physical Sport Science, College of Education, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
| | - Magda H. Abdellattif
- Department of Chemistry, College of Science, Taif University, Al-Haweiah, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Chaigoo Lee
- Golden Engineering Co., Ltd., Seoul 05836, Republic of Korea
| | - Wonjae Lee
- Golden Engineering Co., Ltd., Seoul 05836, Republic of Korea
| | - Timsi Modi
- Department of Environment Sciences, School of Sciences, P P Savani University, Surat 394125, Gujarat, India
| | - Byong-Hun Jeon
- Department of Earth Resources & Environmental Engineering, Hanyang University, 222-Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
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