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Farahain Binti Khusnun N, Jalil AA, Ahmad A, Ikram M, Hassan NS, Nabgan W, Bahari M, Kasmani R, Norazahar N. New insight into the kinetic study on the different loadings of the CuO/CNT catalyst and its optimization for p-chloroaniline photodegradation. NANOSCALE ADVANCES 2022; 4:2836-2843. [PMID: 36131999 PMCID: PMC9418641 DOI: 10.1039/d2na00216g] [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: 04/06/2022] [Accepted: 05/17/2022] [Indexed: 06/15/2023]
Abstract
The effect of the copper (Cu) content on Cu oxide loaded onto a carbon nanotube (CuO/CNT) catalyst on the mechanistic, kinetic, and photonic efficiency of the photodegradation of p-chloroaniline (PCA) under visible (Vis) and ultraviolet (UV) light irradiation has been explored. For low-loading (1-5 wt%) CuO/CNTs, photodegradation performed better under UV (>84%) rather than the Vis system; this may be due to the presence of abundant defect sites on both CuO and CNTs, which allowed the multielectron reduction of oxygen at their impurity levels to generate more hydrogen peroxide and subsequent ·OH radicals. The active species under UV were in the following order: h+ ≫ e- > ·OH, while it was vice versa for the Vis system with a well-balanced 50 wt% CuO/CNT catalyst that exhibited a similar performance. The kinetic study showed the transition of the kinetic order from the zeroth to the first order on increasing the PCA concentration under the Vis system and vice versa for the UV system. The Thiele modulus (ϕ) further confirmed that the effect of internal mass transfer was negligible under UV light. In contrast, the transition from mass transfer to kinetic control limitation was observed under the Vis system. The optimum PCA degradation predicted from the response surface analysis was 97.36% at the reaction pH of 7.3, catalyst dosage of 0.45 g L-1, and initial PCA concentration of 11.02 mg L-1. The condition obtained was fairly close to the forecasted value with an error of 0.26%.
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Affiliation(s)
- Nur Farahain Binti Khusnun
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia
| | - Aishah Abdul Jalil
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia
- Centre of Hydrogen Energy, Institute of Future Energy, Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia
| | - Arshad Ahmad
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia
- Centre of Hydrogen Energy, Institute of Future Energy, Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia
| | - Muhammad Ikram
- Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore 54000 Punjab Pakistan
| | - Nurul Sahida Hassan
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia
| | - Walid Nabgan
- Departament d'Enginyeria Química, Universitat Rovira I Virgili Av Països Catalans 26 43007 Tarragona Spain
| | - Mahadi Bahari
- Faculty of Science, Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia
| | - Rafiziana Kasmani
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia
- Centre of Hydrogen Energy, Institute of Future Energy, Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia
| | - Norafneeza Norazahar
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia
- Centre of Hydrogen Energy, Institute of Future Energy, Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia
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Rajapaksha AU, Selvasembian R, Ashiq A, Gunarathne V, Ekanayake A, Perera VO, Wijesekera H, Mia S, Ahmad M, Vithanage M, Ok YS. A systematic review on adsorptive removal of hexavalent chromium from aqueous solutions: Recent advances. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 809:152055. [PMID: 34871684 DOI: 10.1016/j.scitotenv.2021.152055] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Revised: 11/02/2021] [Accepted: 11/25/2021] [Indexed: 05/26/2023]
Abstract
The contamination of natural resources by hexavalent chromium (Cr(VI)) originating from natural and anthropogenic activities is a serious environmental concern. Although many articles on chromium remediation have been published, a comprehensive understanding of the mechanisms involved in remediation with different sorbents is not yet available. In this systematic review, the performance and applicability of several adsorptive materials for Cr(VI) removal from aqueous media are discussed, along with a detailed analysis of the mechanisms involved. Statistical analysis is applied to compare the efficacies of different adsorbents, while a similar approach is used to determine the effects of sorbent properties and experimental conditions on the adsorption capacity. A detailed analysis of the factors involved in fixed-bed column studies is also presented. A suitable desorption approach to the regeneration of the spent adsorbent and its adsorption performance in reuse is also examined. Among the different sorbents, nanoparticles and mineral-doped biochar were found to be the most effective sorbents, while the adsorption was higher at low pH (~4.0) than that at intermediate pH (6-8). Contrary to our expectation, adsorption was high for sorbents with low specific surface areas, suggesting that the adsorption of Cr(VI) is largely influenced by the chemical properties of the sorbents. The optimum adsorption in fixed-bed column systems is obtained at a lower Cr(VI) ion concentration, a lower influent flow rate, and a higher bed height. Since most of the studies reviewed herein were merely experimental and utilized ideal conditions with the presence of a single contaminant, i.e. Cr(VI) in water, further studies on adsorption dynamics with the presence of other interfering ions are suggested. This review is promising for the further development of Cr(VI) removal strategies and closes the research gaps pertaining to their challenges.
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Affiliation(s)
- Anushka Upamali Rajapaksha
- Ecosphere Resilience Research Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka; Instrument Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka.
| | - Rangabhashiyam Selvasembian
- Department of Biotechnology, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, India
| | - Ahamed Ashiq
- Ecosphere Resilience Research Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka; Hydrometallurgy and Environment Laboratory, Robert M. Buchan Department of Mining, Queen's University, 25 Union Street, Kingston, Ontario K7L 3N6, Canada
| | - Viraj Gunarathne
- Ecosphere Resilience Research Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka; University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstraße 7, 42285 Wuppertal, Germany
| | - Anusha Ekanayake
- Ecosphere Resilience Research Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka
| | - V O Perera
- Ecosphere Resilience Research Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka
| | - Hasintha Wijesekera
- Department of Natural Resources, Sabaragamuwa University of Sri Lanka, Belihuloya, Sri Lanka
| | - Shamin Mia
- Department of Agronomy, Patuakhali Science and Technology, University of Patuakhali, Bangladesh
| | - Mahtab Ahmad
- Department of Environmental Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, 45320, Pakistan
| | - Meththika Vithanage
- Ecosphere Resilience Research Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka
| | - Yong Sik Ok
- Korea Biochar Research Center & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea.
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Wu H, Meng F, Liu X, Yu B. Carbon nanotubes as electronic mediators combined with Bi 2MoO 6and g-C 3N 4to form Z-scheme heterojunctions to enhance visible light photocatalysis. NANOTECHNOLOGY 2021; 33:115203. [PMID: 34852335 DOI: 10.1088/1361-6528/ac3f13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 12/01/2021] [Indexed: 06/13/2023]
Abstract
In this paper, Z-scheme Bi2MoO6/CNTs/g-C3N4composite photocatalysts were prepared through a simple hydrothermal method. The analysis was performed by XRD, FT-IR, SEM, EDS, TEM, HRTEM, XPS, BET, UV-Vis diffuse reflectance and PL spectrums. Various analyses show that CNTs not only act as excellent charge transfer bridges, but also enable a formation of the Z-scheme of charge transfer mechanism between Bi2MoO6and g-C3N4. This process not only effectively isolates electrons and holes, but also prolongs electron-hole pair lifetimes, resulting in a substantial improvement in the photocatalytic performance of the composite photocatalyst. Best photocatalytic degradation performance was shown by Bi2MoO6/CNTs/g-C3N4composite photocatalyst under simulated sunlight, while the composite photocatalyst still maintained extremely high degradation performance in cycling tests.
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Affiliation(s)
- Hao Wu
- School of Materials Science and Engineering, Anhui University, Hefei 230601, People's Republic of China
- School of Physics and Optoelectronics Engineering, Anhui University, Hefei 230601, People's Republic of China
| | - Fanming Meng
- School of Materials Science and Engineering, Anhui University, Hefei 230601, People's Republic of China
- School of Physics and Optoelectronics Engineering, Anhui University, Hefei 230601, People's Republic of China
| | - Xingbing Liu
- School of Materials Science and Engineering, Anhui University, Hefei 230601, People's Republic of China
- School of Physics and Optoelectronics Engineering, Anhui University, Hefei 230601, People's Republic of China
| | - Bo Yu
- School of Materials Science and Engineering, Anhui University, Hefei 230601, People's Republic of China
- School of Physics and Optoelectronics Engineering, Anhui University, Hefei 230601, People's Republic of China
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Zhang F, Shen L, Li J, Zhang Y, Wang G, Zhu A. Room temperature photocatalytic deposition of Au nanoparticles on SnS2 nanoplates for enhanced photocatalysis. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2021.01.065] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Manikandan S, Karmegam N, Subbaiya R, Karthiga Devi G, Arulvel R, Ravindran B, Kumar Awasthi M. Emerging nano-structured innovative materials as adsorbents in wastewater treatment. BIORESOURCE TECHNOLOGY 2021; 320:124394. [PMID: 33220545 DOI: 10.1016/j.biortech.2020.124394] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 10/31/2020] [Accepted: 11/05/2020] [Indexed: 06/11/2023]
Abstract
Water supply around the globe is struggling to meet the rapidly increasing demand by the population, drastic changes in climate and degrading water quality. Even though, many large-scale methods are employed for wastewater treatment they display several negative impacts owing to the presence of pollutants. Technological innovation is required for integrated water management with different groups of nanomaterials for the removal of toxic metal ions, microbial disease, organic and inorganic solutes. The method of manipulating atoms on a nanoscale is nanotechnology. Nanomembranes are used in nanotechnology to soften water and eliminate physical, chemical and biological pollutants. The present review concentrates on various nanotechnological approaches in wastewater remedy, mechanisms involved to promote implementation, benefits and limitations in comparison with current processes, properties, barriers and commercialization research needs. Also the review identifies opportunities for further exploiting the exclusive features for green water management by following the advances in nanotechnology.
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Affiliation(s)
- Sivasubramanian Manikandan
- Department of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha Nagar, Thandalam, Chennai 602 105, Tamil Nadu, India
| | - Natchimuthu Karmegam
- Department of Botany, Government Arts College (Autonomous), Salem 636 007, Tamil Nadu, India
| | - Ramasamy Subbaiya
- Department of Biological Sciences, School of Mathematics and Natural Sciences, The Copperbelt University, Riverside, Jambo Drive, P O Box 21692, Kitwe, Zambia
| | - Guruviah Karthiga Devi
- Department of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha Nagar, Thandalam, Chennai 602 105, Tamil Nadu, India
| | - Ramaswamy Arulvel
- Department of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha Nagar, Thandalam, Chennai 602 105, Tamil Nadu, India
| | - Balasubramani Ravindran
- Department of Environmental Energy and Engineering, Kyonggi University, Youngtong - Gu, Suwon 16227, South Korea
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, Taicheng Road 3#, Yangling, Shaanxi 712100, China.
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