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Parambil AM, Rajan S, Huang PC, Shashikumar U, Tsai PC, Rajamani P, Lin YC, Ponnusamy VK. Carbon and graphene quantum dots based architectonics for efficient aqueous decontamination by adsorption chromatography technique - Current state and prospects. ENVIRONMENTAL RESEARCH 2024; 251:118541. [PMID: 38417656 DOI: 10.1016/j.envres.2024.118541] [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: 07/02/2023] [Revised: 01/31/2024] [Accepted: 02/22/2024] [Indexed: 03/01/2024]
Abstract
Aquatic ecosystems and potable water are being exploited and depleted due to urbanization and the encouragement of extensive industrialization, which induces the scarcity of pure water. However, current decontamination methods are limited and inefficient. Various innovative remediation strategies with novel nanomaterials have recently been demonstrated for wastewater treatment. Carbon dots (C-dots) and graphene quantum dots (GQ-dots) are the most recent frontiers in carbon nanomaterial-based adsorption studies. C-dots are extremely small (1-10 nm) quasi-spherical carbon nanoparticles (mostly sp3 hybridized carbon), whereas GQ-dots are fragments of graphene (1-20 nm) composed of primarily sp2 hybridized carbon. This article highlights the function of C-dots and GQ-dots with their specifications and characteristics for the efficient removal of organic and inorganic contaminants in water via adsorption chromatography. The alteration of adsorption attributes with the hybrid blending of these dots has been critically analyzed. Moreover, various top-down and bottom-up approaches for synthesizing C-dots and GQ-dots, which ultimately affect their morphology and structure, are described in detail. Finally, we review the research deficit in the adsorption of diverse pollutants, fabrication challenges, low molecular weight, self-agglomeration, and the future of the dots by providing research prospects and selectivity and sensitivity perspectives, the importance of post-adsorption optimization strategies and the path toward scalability at the tail of the article.
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Affiliation(s)
- Ajith Manayil Parambil
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India, 110067; Research Center for Precision Environmental Medicine, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan
| | - Shijin Rajan
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India, 110067
| | - Po-Chin Huang
- National Institute of Environmental Health Sciences, National Health Research Institutes, Miaoli, 350, Taiwan
| | - Uday Shashikumar
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan
| | - Pei-Chien Tsai
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Department of Computational Biology, Institute of Bioinformatics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Chennai, Tamil Nadu 602105, India
| | - Paulraj Rajamani
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India, 110067.
| | - Yuan-Chung Lin
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung City, Taiwan; Center for Emerging Contaminants Research, National Sun Yat-Sen University, Kaohsiung City, Taiwan.
| | - Vinoth Kumar Ponnusamy
- Research Center for Precision Environmental Medicine, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Department of Medicinal and Applied Chemistry, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Center for Emerging Contaminants Research, National Sun Yat-Sen University, Kaohsiung City, Taiwan; Department of Medical Research, Kaohsiung Medical University Hospital (KMUH), Kaohsiung City, 807, Taiwan; Department of Chemistry, National Sun Yat-sen University (NSYSU), Kaohsiung City, 804, Taiwan.
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Ghasedi A, Koushki E, Baedi J. Cation-π aggregation-induced white emission of moisture-resistant carbon quantum dots: a comprehensive spectroscopic study. Phys Chem Chem Phys 2022; 24:23802-23816. [PMID: 36164843 DOI: 10.1039/d2cp03388g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Controlling mechanisms involved in the aggregation of carbon quantum dots (CQDs) can lead to new application developments for these quantum dot materials. In this study, an unusual aggregation-induced white emission of CQDs with strong intrinsic green emission is reported. Due to the deprotonation/protonation of the surface functional groups during the aggregation of CQDs induced by pH variations of the solution through the addition of sodium hydroxide, and hydrophobic interactions between CQDs, it results in the formation of aggregated CQDs through an avalanche-like process. Our results suggest that sodium hydroxide not only plays a critical role in the formation of strong cation-π interactions, but also polishes the surface of CQDs, leading to the formation of the aggregated CQDs. The aggregated CQDs present excellent dispersibility characteristics in water. Moreover, optical studies suggest a combined aggregation mechanism in the presence of both J-type and H-type aggregation monoliths involved in forming the aggregated CQDs. The findings obtained from the deconvolution of the as-synthesized CQDs can perceptively elucidate the cation-π aggregation process.
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Affiliation(s)
- Arman Ghasedi
- Department of Physics, Faculty of Sciences, Hakim Sabzevari University, Sabzevar, 96179-76487, Iran.
| | - Ehsan Koushki
- Department of Physics, Faculty of Sciences, Hakim Sabzevari University, Sabzevar, 96179-76487, Iran.
| | - Javad Baedi
- Department of Physics, Faculty of Sciences, Hakim Sabzevari University, Sabzevar, 96179-76487, Iran.
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Sanmartín-Matalobos J, Bermejo-Barrera P, Aboal-Somoza M, Fondo M, García-Deibe AM, Corredoira-Vázquez J, Alves-Iglesias Y. Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2501. [PMID: 35889725 PMCID: PMC9318497 DOI: 10.3390/nano12142501] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Revised: 07/17/2022] [Accepted: 07/19/2022] [Indexed: 02/04/2023]
Abstract
Since the discovery of Quantum Dots (QDs) by Alexey I. Ekimov in 1981, the interest of researchers in that particular type of nanomaterials (NMs) with unique optical and electrical properties has been increasing year by year. Thus, since 2009, the number of scientific articles published on this topic has not been less than a thousand a year. The increasing use of QDs due to their biomedical, pharmaceutical, biological, photovoltaics or computing applications, as well as many other high-tech uses such as for displays and solid-state lighting (SSL), has given rise to a considerable number of studies about its potential toxicity. However, there are a really low number of reported studies on the detection and quantification of QDs, and these include ICP-MS and electrochemical analysis, which are the most common quantification techniques employed for this purpose. The knowledge of chemical phenomena occurring on the surface of QDs is crucial for understanding the interactions of QDs with species dissolved in the dispersion medium, while it paves the way for a widespread use of chemosensors to facilitate its detection. Keeping in mind both human health and environmental risks of QDs as well as the scarcity of analytical techniques and methodological approaches for their detection, the adaptation of existing techniques and methods used with other NMs appears necessary. In order to provide a multidisciplinary perspective on QD detection, this review focused on three interrelated key aspects of QDs: properties, surface chemistry and detection.
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Affiliation(s)
- Jesús Sanmartín-Matalobos
- Coordination and Supramolecular Chemistry Group (SupraMetal), Department of Inorganic Chemistry, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (M.F.); (J.C.-V.); (Y.A.-I.)
| | - Pilar Bermejo-Barrera
- Trace Element, Speciation and Spectroscopy Group (GETEE), Department of Analytical Chemistry, Nutrition and Bromatology, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (P.B.-B.); (M.A.-S.)
| | - Manuel Aboal-Somoza
- Trace Element, Speciation and Spectroscopy Group (GETEE), Department of Analytical Chemistry, Nutrition and Bromatology, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (P.B.-B.); (M.A.-S.)
| | - Matilde Fondo
- Coordination and Supramolecular Chemistry Group (SupraMetal), Department of Inorganic Chemistry, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (M.F.); (J.C.-V.); (Y.A.-I.)
| | - Ana M. García-Deibe
- Coordination and Supramolecular Chemistry Group (SupraMetal), Department of Inorganic Chemistry, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (M.F.); (J.C.-V.); (Y.A.-I.)
| | - Julio Corredoira-Vázquez
- Coordination and Supramolecular Chemistry Group (SupraMetal), Department of Inorganic Chemistry, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (M.F.); (J.C.-V.); (Y.A.-I.)
| | - Yeneva Alves-Iglesias
- Coordination and Supramolecular Chemistry Group (SupraMetal), Department of Inorganic Chemistry, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (M.F.); (J.C.-V.); (Y.A.-I.)
- Trace Element, Speciation and Spectroscopy Group (GETEE), Department of Analytical Chemistry, Nutrition and Bromatology, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (P.B.-B.); (M.A.-S.)
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Ghaffarkhah A, Hosseini E, Kamkar M, Sehat AA, Dordanihaghighi S, Allahbakhsh A, van der Kuur C, Arjmand M. Synthesis, Applications, and Prospects of Graphene Quantum Dots: A Comprehensive Review. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2102683. [PMID: 34549513 DOI: 10.1002/smll.202102683] [Citation(s) in RCA: 87] [Impact Index Per Article: 43.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 08/12/2021] [Indexed: 05/24/2023]
Abstract
Graphene quantum dot (GQD) is one of the youngest superstars of the carbon family. Since its emergence in 2008, GQD has attracted a great deal of attention due to its unique optoelectrical properties. Non-zero bandgap, the ability to accommodate functional groups and dopants, excellent dispersibility, highly tunable properties, and biocompatibility are among the most important characteristics of GQDs. To date, GQDs have displayed significant momentum in numerous fields such as energy devices, catalysis, sensing, photodynamic and photothermal therapy, drug delivery, and bioimaging. As this field is rapidly evolving, there is a strong need to identify the emerging challenges of GQDs in recent advances, mainly because some novel applications and numerous innovations on the ease of synthesis of GQDs are not systematically reviewed in earlier studies. This feature article provides a comparative and balanced discussion of recent advances in synthesis, properties, and applications of GQDs. Besides, current challenges and future prospects of these emerging carbon-based nanomaterials are also highlighted. The outlook provided in this review points out that the future of GQD research is boundless, particularly if upcoming studies focus on the ease of purification and eco-friendly synthesis along with improving the photoluminescence quantum yield and production yield of GQDs.
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Affiliation(s)
- Ahmadreza Ghaffarkhah
- Nanomaterials and Polymer Nanocomposites Laboratory, School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada
| | - Ehsan Hosseini
- Nanomaterials and Polymer Nanocomposites Laboratory, School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada
| | - Milad Kamkar
- Nanomaterials and Polymer Nanocomposites Laboratory, School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada
| | - Ali Akbari Sehat
- Nanomaterials and Polymer Nanocomposites Laboratory, School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada
| | - Sara Dordanihaghighi
- Nanomaterials and Polymer Nanocomposites Laboratory, School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada
| | - Ahmad Allahbakhsh
- Department of Materials and Polymer Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran
| | - Colin van der Kuur
- ZEN Graphene Solutions, 210-1205 Amber Dr., Thunder Bay, ON, P7B 6M4, Canada
| | - Mohammad Arjmand
- Nanomaterials and Polymer Nanocomposites Laboratory, School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada
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Abdolkarimi-Mahabadi M, Bayat A, Mohammadi A. Use of UV-Vis Spectrophotometry for Characterization of Carbon Nanostructures: a Review. THEOR EXP CHEM+ 2021. [DOI: 10.1007/s11237-021-09687-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Xia C, Qiu Y, Xia Y, Zhu P, King G, Zhang X, Wu Z, Kim JYT, Cullen DA, Zheng D, Li P, Shakouri M, Heredia E, Cui P, Alshareef HN, Hu Y, Wang H. General synthesis of single-atom catalysts with high metal loading using graphene quantum dots. Nat Chem 2021; 13:887-894. [PMID: 34168326 DOI: 10.1038/s41557-021-00734-x] [Citation(s) in RCA: 186] [Impact Index Per Article: 62.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 05/17/2021] [Indexed: 11/09/2022]
Abstract
Transition-metal single-atom catalysts present extraordinary activity per metal atomic site, but suffer from low metal-atom densities (typically less than 5 wt% or 1 at.%), which limits their overall catalytic performance. Here we report a general method for the synthesis of single-atom catalysts with high transition-metal-atom loadings of up to 40 wt% or 3.8 at.%, representing several-fold improvements compared to benchmarks in the literature. Graphene quantum dots, later interweaved into a carbon matrix, were used as a support, providing numerous anchoring sites and thus facilitating the generation of high densities of transition-metal atoms with sufficient spacing between the metal atoms to avoid aggregation. A significant increase in activity in electrochemical CO2 reduction (used as a representative reaction) was demonstrated on a Ni single-atom catalyst with increased Ni loading.
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Affiliation(s)
- Chuan Xia
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA. .,Smalley-Curl Institute, Rice University, Houston, TX, USA. .,School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, P. R. China.
| | - Yunrui Qiu
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA
| | - Yang Xia
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA
| | - Peng Zhu
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA
| | - Graham King
- Canadian Light Source, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Xiao Zhang
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA
| | - Zhenyu Wu
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA
| | - Jung Yoon Timothy Kim
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA
| | - David A Cullen
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Dongxing Zheng
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Peng Li
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Mohsen Shakouri
- Canadian Light Source, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Emilio Heredia
- Canadian Light Source, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Peixin Cui
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, P. R. China
| | - Husam N Alshareef
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Yongfeng Hu
- Canadian Light Source, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
| | - Haotian Wang
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA. .,Department of Materials Science and Nano-Engineering, Rice University, Houston, TX, USA. .,Department of Chemistry, Rice University, Houston, TX, USA. .,Azrieli Global Scholar, Canadian Institute for Advanced Research (CIFAR), Toronto, Ontario, Canada.
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Shayan Nasr M, Esmaeilnezhad E, Allahbakhsh A, Choi HJ. Nitrogen-doped graphene quantum dot nanofluids to improve oil recovery from carbonate and sandstone oil reservoirs. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115715] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Hu Y, Zhan W, Wu Z, Tang Y, Huang Y, Ding XT, Chen D. Poly(styrene‐alt‐maleic anhydride) ionic salt functionalized reduced graphene oxide doped with rare earth ions for anti‐corrosion performance enhancement. J Appl Polym Sci 2021. [DOI: 10.1002/app.50666] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Yue Hu
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
- Chemical Engineering and Material Science, College of Chemistry Soochow University Suzhou China
| | - Weiwu Zhan
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
- Chemical Engineering and Material Science, College of Chemistry Soochow University Suzhou China
| | - Zhifeng Wu
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
| | - Yanreng Tang
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
| | - Yangdi Huang
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
| | - Xu Te Ding
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
| | - Dianyu Chen
- Department of material engineering, Jiangsu Key Laboratory of Functional Materials Changshu Institute of Technology Changshu China
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Zhao C, Song X, Liu Y, Fu Y, Ye L, Wang N, Wang F, Li L, Mohammadniaei M, Zhang M, Zhang Q, Liu J. Synthesis of graphene quantum dots and their applications in drug delivery. J Nanobiotechnology 2020; 18:142. [PMID: 33008457 PMCID: PMC7532648 DOI: 10.1186/s12951-020-00698-z] [Citation(s) in RCA: 73] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 09/24/2020] [Indexed: 12/23/2022] Open
Abstract
This review focuses on the recent advances in the synthesis of graphene quantum dots (GQDs) and their applications in drug delivery. To give a brief understanding about the preparation of GQDs, recent advances in methods of GQDs synthesis are first presented. Afterwards, various drug delivery-release modes of GQDs-based drug delivery systems such as EPR-pH delivery-release mode, ligand-pH delivery-release mode, EPR-Photothermal delivery-Release mode, and Core/Shell-photothermal/magnetic thermal delivery-release mode are reviewed. Finally, the current challenges and the prospective application of GQDs in drug delivery are discussed.
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Affiliation(s)
- Changhong Zhao
- School of Life Sciences and Technology, Xinxiang Medical University, Xinxiang, 453003, P. R. China.
- Electronics Materials and Systems Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, 412 96, Gothenburg, Sweden.
| | - Xuebin Song
- School of Life Sciences and Technology, Xinxiang Medical University, Xinxiang, 453003, P. R. China
| | - Ya Liu
- Electronics Materials and Systems Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, 412 96, Gothenburg, Sweden
| | - Yifeng Fu
- Electronics Materials and Systems Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, 412 96, Gothenburg, Sweden
| | - Lilei Ye
- SHT Smart High-Tech AB, 411 33, Gothenburg, Sweden
| | - Nan Wang
- SHT Smart High-Tech AB, 411 33, Gothenburg, Sweden
| | - Fan Wang
- School of Life Sciences and Technology, Xinxiang Medical University, Xinxiang, 453003, P. R. China
| | - Lu Li
- School of Life Sciences and Technology, Xinxiang Medical University, Xinxiang, 453003, P. R. China
| | - Mohsen Mohammadniaei
- Department of Health Technology, Technical University of Denmark, 2800, Kongens Lyngby, Denmark
| | - Ming Zhang
- Department of Health Technology, Technical University of Denmark, 2800, Kongens Lyngby, Denmark
| | - Qiqing Zhang
- School of Life Sciences and Technology, Xinxiang Medical University, Xinxiang, 453003, P. R. China.
| | - Johan Liu
- Electronics Materials and Systems Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, 412 96, Gothenburg, Sweden.
- School of Automation and Mechanical Engineering, SMIT Center, Shanghai University, No 20, Chengzhong Road, Box 808, ShanghaiShanghai, 201800, China.
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Rani UA, Ng LY, Ng CY, Mahmoudi E. A review of carbon quantum dots and their applications in wastewater treatment. Adv Colloid Interface Sci 2020; 278:102124. [PMID: 32142942 DOI: 10.1016/j.cis.2020.102124] [Citation(s) in RCA: 75] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 01/16/2020] [Accepted: 02/15/2020] [Indexed: 12/20/2022]
Abstract
Carbon quantum dots (CQDs) are a fascinating class of carbon nanoparticles with sizes around 10 nm. The unique properties of CQDs are low toxicity, chemical inertness, excellent biocompatibility, photo-induced electron transfer and highly tunable photoluminescence behaviour. Sustainable raw materials are commonly used for the fabrication of CQDs because they are cost-effective, eco-friendly and effective to minimise waste production. CQDs can be fabricated using laser ablation, microwave irradiation, hydrothermal reaction, electrochemical oxidation, reflux method and ultrasonication. These methods undergo several chemical reactions such as oxidation, carbonisation, pyrolysis and polymerisation processes to produce CQDs. Due to small particle sizes of CQDs, they possess strong tunable fluorescent properties and highly photo-luminescent emissions. It also contains oxygen-based functional groups and highly desired properties as semiconductor nanoparticles. Therefore, CQDs are promising nanomaterials for photo-catalysis, ions sensing, biological imaging, heavy metal detection, adsorption treatment, supercapacitor, membrane fabrication and water pollution treatment. This review paper will discuss the physical and chemical properties of CQDs, raw materials and methods used in the fabrication of CQDs, the stability of CQDs as well as their potential applications in wastewater treatment and biomedical field.
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Affiliation(s)
- Umairah Abd Rani
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Sungai Long, Bandar Sungai Long, 43000 Kajang, Selangor, Malaysia
| | - Law Yong Ng
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Sungai Long, Bandar Sungai Long, 43000 Kajang, Selangor, Malaysia.
| | - Ching Yin Ng
- Department of Chemical Engineering, Faculty of Engineering, Technology and Built Environment, UCSI University (Kuala Lumpur Campus), No. 1, Jalan Menara Gading, UCSI Heights (Taman Connaught), 56000 Cheras, Kuala Lumpur, Malaysia
| | - Ebrahim Mahmoudi
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor Darul Ehsan, Malaysia
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