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Oliveras J, Marcon L, Bastús NG, Puntes V. Functionalization of graphene nanostructures with inorganic nanoparticles and their use for the removal of pharmaceutical pollutants in water. FRONTIERS IN CHEMICAL ENGINEERING 2022. [DOI: 10.3389/fceng.2022.1084035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Emerging pollutants such as pharmaceuticals are of special concern because despite their low environmental concentration, their biological activity can be intense, and they should be prevented to reach uncontrolledly to the environment. A graphene-based hybrid material decorated with Fe3O4 and TiO2 nanoparticles (NPs) has been prepared to effectively remove emerging pollutants as nonsteroidal anti-inflammatory drugs (NSAIDs) Ibuprofen and Diclofenac present in water at low environmental concentrations by a one-step functionalization process following a novel gentle and scalable surfactant depletion approach. Following this methodology, nanoparticles are progressively deprived of their original surfactant in the presence of graphene, leading to the formation of hybrid nanostructures composed of two different types of nanoparticles well dispersed over the graphene nanosheets. Ibuprofen and Diclofenac adsorption kinetics on the composites was investigated via UV-Vis spectroscopy. The as prepared hybrid material possesses high adsorption capacity, superparamagnetic properties, photocatalytic behavior, and good water dispersibility. Thanks to incorporating TiO2 nanoparticles as in situ catalysts, the adsorption performance of composites is restored after use, which could be a promising recycling pathway for the adsorbents in wastewater treatments.
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Liu R, Wang H, Yue C, Zhang X, Wang M, Liu L. Synthesis of molybdenum disulfide/graphene oxide composites for effective removal of U (VI) from aqueous solutions. J Radioanal Nucl Chem 2022. [DOI: 10.1007/s10967-022-08425-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Li X, Li X, Chen Q, Chen J, Wu P. Activating the Neutral pH Photozymatic Activity of g-C3N4 Nanosheet through Post-Synthetic Incorporation of Pt. Chem Commun (Camb) 2022; 58:6930-6933. [DOI: 10.1039/d2cc01512a] [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
The catalytic activity of photozyme can be regulated through light irradiation time and intensity, but it still suffers from low activity in physiological neutral pH (typically, pH < 5). Herein,...
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Vishwakarma RK, Narayanam PK, R U, K S. Surface modified and functionalized graphene oxide membranes for separation of strontium from aqueous solutions. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 298:113443. [PMID: 34385117 DOI: 10.1016/j.jenvman.2021.113443] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 07/23/2021] [Accepted: 07/29/2021] [Indexed: 06/13/2023]
Abstract
Graphene oxide-strontium (GO-Sr) composites prepared under different ambient conditions were characterized using morphological and spectroscopic techniques to optimize the uptake of Sr from aqueous solutions. These studies indicated that interactions among GO and Sr2+ ions are highly sensitive to size and aging of GO sheets, as well as pH of the ambience. Further, the extent of Sr uptake on GO sheets was found to be largely influenced by relative fractions of the associated -COOH, -OH, C-O-C functional groups and sp2-C domains. Membranes prepared using various forms of GO were evaluated for their Sr separation ability and, a window of parameters for optimum separation of Sr has been proposed. Among the variety of membranes studied, those made up of fresh and large GO sheets were found to exhibit superior Sr adsorption capacity (~296 mg/g) at limited GO mass. Further, adsorption efficiency of these GO membranes was observed to deteriorate with aging of GO sheets and rise of GO mass on membrane. The membrane based filtration procedure introduced in present work facilitates to provide a lamellar structure of GO sheets with abundant surface area, diverse and accessible sites for Sr2+ ion uptake and offer high Sr adsorption efficiencies.
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Affiliation(s)
| | - Pavan K Narayanam
- Homi Bhabha National Institute, Kalpakkam, 603102, India; Materials Chemistry & Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India.
| | - Umamaheswari R
- Materials Chemistry & Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
| | - Sundararajan K
- Homi Bhabha National Institute, Kalpakkam, 603102, India; Materials Chemistry & Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India.
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Chen Z, Hsieh T, Liu C. Production of carbon dots by pulsed laser ablation: Precursors and
photo‐oxidase
properties. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202100271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Zhi‐Wen Chen
- Department of Chemistry Fu Jen Catholic University New Taipei City Taiwan
| | - Tien‐Hao Hsieh
- Department of Chemistry Fu Jen Catholic University New Taipei City Taiwan
| | - Ching‐Ping Liu
- Department of Chemistry Fu Jen Catholic University New Taipei City Taiwan
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Narayanam PK, Major S. Langmuir-Blodgett based growth of rGO wrapped TiO2 nanostructures and their photocatalytic performance. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125652] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Pedrosa M, Da Silva ES, Pastrana-Martínez LM, Drazic G, Falaras P, Faria JL, Figueiredo JL, Silva AMT. Hummers' and Brodie's graphene oxides as photocatalysts for phenol degradation. J Colloid Interface Sci 2020; 567:243-255. [PMID: 32062085 DOI: 10.1016/j.jcis.2020.01.093] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 01/22/2020] [Accepted: 01/24/2020] [Indexed: 12/11/2022]
Abstract
Undoped metal-free graphene oxide (GO) materials prepared by either a modified Hummers' (GO-H) or a Brodie's (GO-B) method were tested as photocatalysts in aqueous solution for the oxidative conversion of phenol. In the dark, the adsorptive capacity of GO-B towards phenol (~35%) was higher than that of GO-H (~15%). Upon near-UV/Vis irradiation, GO-H was able to remove 21% of phenol after 180 min, mostly through adsorption. On the other hand, by using less energetic visible irradiation, GO-B removed as much as 95% in just 90 min. By thorough characterization of the prepared materials (SEM, HRTEM, TGA, TPD, Raman, XRD, XPS and photoluminescence) the observed performances could be explained in terms of their different surface chemistries. The GO-B presents the lower concentration of oxygen functional groups (in particular carbonyl groups as revealed by XPS) and it has a considerably higher photocatalytic activity compared to GO-H. Photoluminescence (PL) of liquid dispersions and XRD analysis of powders showed lower PL intensity and smaller interlayer distance for GO-B relative to GO-H, respectively: this suggests lower electron-hole recombination and enhanced electron transfer in GO-B, in support of its boosted photocatalytic activity. Reusability tests showed no efficiency loss after a second usage cycle and over three runs under visible irradiation, which was in line with the similarity of the XPS spectra of the fresh and used GO-B materials. Moreover, scavenging studies revealed that holes and hydroxyl radicals were the main reactive species in play during the photocatalytic process. The obtained results, establish for the first time, that GO prepared by Brodie's method is an active and stable undoped metal-free photocatalyst for phenol degradation in aqueous solutions, opening new paths for the application of more sustainable and metal-free materials for water treatment solutions.
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Affiliation(s)
- Marta Pedrosa
- Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Eliana S Da Silva
- Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Luisa M Pastrana-Martínez
- Carbon Materials Research Group, Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, 18071 Granada, Spain
| | - Goran Drazic
- Department for Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
| | - Polycarpos Falaras
- National Centre for Scientific Research "Demokritos", Institute of Nanoscience and Nanotechnology, 15341, Agia Paraskevi Attikis, Athens, Greece
| | - Joaquim L Faria
- Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - José L Figueiredo
- Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Adrián M T Silva
- Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
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Zhang J, Liu J. Light-activated nanozymes: catalytic mechanisms and applications. NANOSCALE 2020; 12:2914-2923. [PMID: 31993620 DOI: 10.1039/c9nr10822j] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Recently, nanozymes have attracted enormous interest for their high stability, low cost and various enzyme-like activities. In nature, many biochemical reactions require light. Recently, introducing light to nanozymes has also been reported, especially for photosensitized oxygen activation. Compared to normal nanozymes, light-activated nanozymes possess several advantages including light-regulated activity, using molecular oxygen as a green oxidant, and often higher activity can be achieved. Herein, we summarize light-activated nanozymes, starting from their photophysical processes and identification of reactive oxygen species (ROS). Although the types of light-activated nanozymes are still quite limited and cannot yet mimic the same reactions as natural photo-related enzymes, they have widened the range of nanozymes. A few specific applications are highlighted, including sensing, chemical synthesis, degradation of organic pollutants, and cleavage and repair of DNA. Finally, a few future research opportunities are discussed.
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Affiliation(s)
- Jinyi Zhang
- Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
| | - Juewen Liu
- Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
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Abstract
Using light as an external stimulus plays a key role not only in modulating activities of nanozymes, but also in constructing efficient biosensing systems.
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Affiliation(s)
- Yufeng Liu
- Department of Biomedical Engineering
- College of Engineering and Applied Sciences
- Nanjing National Laboratory of Microstructures
- Jiangsu Key Laboratory of Artificial Functional Materials
- Chemistry and Biomedicine Innovation Center (ChemBIC)
| | - Xiaoyu Wang
- Department of Biomedical Engineering
- College of Engineering and Applied Sciences
- Nanjing National Laboratory of Microstructures
- Jiangsu Key Laboratory of Artificial Functional Materials
- Chemistry and Biomedicine Innovation Center (ChemBIC)
| | - Hui Wei
- Department of Biomedical Engineering
- College of Engineering and Applied Sciences
- Nanjing National Laboratory of Microstructures
- Jiangsu Key Laboratory of Artificial Functional Materials
- Chemistry and Biomedicine Innovation Center (ChemBIC)
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Zhang J, Wu S, Lu X, Wu P, Liu J. Lanthanide-Boosted Singlet Oxygen from Diverse Photosensitizers along with Potent Photocatalytic Oxidation. ACS NANO 2019; 13:14152-14161. [PMID: 31769964 DOI: 10.1021/acsnano.9b06840] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Singlet oxygen (1O2) plays a central role in photochemical and photobiological research. Although many photosensitizers for efficient 1O2 generation were reported, further improving its yield and oxidation power is still highly desirable. Instead of developing new ones, current photosensitizers might be boosted by mediators to facilitate energy transfer. Taking advantage of the long triplet state lifetime of lanthanide ions (Ln3+), we herein demonstrate their roles as potent oxidation mediators. Using oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) at neutral pH as a difficult model reaction, based on the fluorescence, phosphorescence, and metal-binding properties, various dyes and nanomaterials were classified into four types. The 1O2 emission of carbon dots and rose bengal was enhanced 4 times in the presence of Ce3+. Some nonphosphorescent, but strongly fluorescent dyes that are not known as photosensitizers can still be mediated by Ln3+ to produce 1O2, but metal-chelating calcein was not enhanced. Finally, nonemissive dyes failed to show activity. As mediators, the excited Ln3+ can migrate a long distance and transfer energy to O2, resulting in high 1O2 yield. Since redox-active Ce3+ and Eu3+ had the highest activity, participation of oxidation involving excited lanthanides might be possible too. In addition, Ln3+ also enhanced the activity of graphene quantum dots, graphene oxide, and g-C3N4. Rapid degradation of organic dyes was demonstrated, further supporting a high photocatalytic activity of the Ln3+-mediated system.
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Affiliation(s)
- Jinyi Zhang
- Department of Chemistry , Waterloo Institute for Nanotechnology , Waterloo , Ontario , Canada N2L 3G1
| | - Shihong Wu
- Analytical & Testing Center, College of Chemistry, State Key Laboratory of Hydraulics and Mountain River Engineering , Sichuan University , Chengdu 610064 , China
| | - Xiaomei Lu
- Analytical & Testing Center, College of Chemistry, State Key Laboratory of Hydraulics and Mountain River Engineering , Sichuan University , Chengdu 610064 , China
| | - Peng Wu
- Analytical & Testing Center, College of Chemistry, State Key Laboratory of Hydraulics and Mountain River Engineering , Sichuan University , Chengdu 610064 , China
| | - Juewen Liu
- Department of Chemistry , Waterloo Institute for Nanotechnology , Waterloo , Ontario , Canada N2L 3G1
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Fan X, Wang Y, Deng L, Li L, Zhang X, Wu P. Oxidative Capacity Storage of Transient Singlet Oxygen from Photosensitization with a Redox Mediator for Improved Chemiluminescent Sensing. Anal Chem 2019; 91:9407-9412. [DOI: 10.1021/acs.analchem.9b01675] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Xiaoya Fan
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China
| | - Yanying Wang
- Analytical & Testing Center, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
| | - Li Deng
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China
| | - Lin Li
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China
| | - Xinfeng Zhang
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China
| | - Peng Wu
- Analytical & Testing Center, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
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Li C, Wang Y, Li C, Xu S, Hou X, Wu P. Simultaneously Broadened Visible Light Absorption and Boosted Intersystem Crossing in Platinum-Doped Graphite Carbon Nitride for Enhanced Photosensitization. ACS APPLIED MATERIALS & INTERFACES 2019; 11:20770-20777. [PMID: 31117432 DOI: 10.1021/acsami.9b02767] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Herein, taking graphite carbon nitride ( g-C3N4) as the example, we demonstrated that the two limiting factors that determine the photosensitization performance, namely, light absorption and intersystem crossing (ISC), could be simultaneously enhanced through Pt2+ doping. Specifically, as a π-conjugated two-dimensional semiconductor, g-C3N4 is capable of absorbing light shorter than 460 nm (2.7 eV). Upon Pt2+ doping that allows metal-to-ligand charge transfer (MLCT) from Pt2+ to the substrate g-C3N4, the light absorption of g-C3N4 was greatly expanded up to 1000 nm. Meanwhile, the large atomic number of Pt2+ ensures promotion of ISC to activate the triplet state of g-C3N4 via heavy atom effect (HAE), which was confirmed via both photosensitization performance and photophysical characterizations. Further, the enhanced light absorption and photosensitization of Pt2+-doped g-C3N4 were harvested for antibiotics removal, a type of environment contaminants that gained global attention because of their worldwide abuse. Compared with its undoped counterpart, Pt2+-doped g-C3N4 featured significantly improved antibiotics removal in the presence of low-power white LED irradiation, which is promising for photosensitized environmental remediation.
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Affiliation(s)
- Chaobi Li
- State Key Laboratory of Hydraulics and Mountain River Engineering , Sichuan University , Chengdu 610065 , China
- College of Environment and Ecology , Chengdu University of Technology , Chengdu 610059 , China
| | - Ying Wang
- Analytical & Testing Center , Sichuan University , Chengdu 610064 , China
| | - Chenghui Li
- Analytical & Testing Center , Sichuan University , Chengdu 610064 , China
| | - Shuxia Xu
- College of Environment and Ecology , Chengdu University of Technology , Chengdu 610059 , China
| | - Xiandeng Hou
- Analytical & Testing Center , Sichuan University , Chengdu 610064 , China
| | - Peng Wu
- State Key Laboratory of Hydraulics and Mountain River Engineering , Sichuan University , Chengdu 610065 , China
- Analytical & Testing Center , Sichuan University , Chengdu 610064 , China
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Zhang J, Lu X, Tang D, Wu S, Hou X, Liu J, Wu P. Phosphorescent Carbon Dots for Highly Efficient Oxygen Photosensitization and as Photo-oxidative Nanozymes. ACS APPLIED MATERIALS & INTERFACES 2018; 10:40808-40814. [PMID: 30387982 DOI: 10.1021/acsami.8b15318] [Citation(s) in RCA: 115] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Materials for photosensitized oxygen activation are extremely important for a suite of photodynamic applications in biomedical, analytical, and energy sectors. Carbon-based photosensitizers are attractive for their low cost and high stability, but most of them such as fullerene and graphene quantum dots suffer from low efficiency, and the rational design of carbon-based photosensitizers remains a challenge. Given the similar chemical origin of phosphorescence and photosensitization, we herein synthesized a series of nitrogen-doped carbon dots (C-dots) and confirmed that their photo-oxidation activity correlated with their phosphorescence quantum yields, providing a direction for the rational designing of such materials. Compared to other carbon nanomaterials and molecular photosensitizers, these C-dots have the highest activity, and they can finish oxidation reactions in a few seconds. The excellent photosensitized oxygen activation makes these water-soluble C-dots a promising oxidase-mimicking nanozyme for photodynamic antimicrobial chemotherapy and other applications.
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Affiliation(s)
- Jinyi Zhang
- Department of Chemistry, Waterloo Institute for Nanotechnology , University of Waterloo , Waterloo , Ontario N2L 3G1 , Canada
| | | | | | | | | | - Juewen Liu
- Department of Chemistry, Waterloo Institute for Nanotechnology , University of Waterloo , Waterloo , Ontario N2L 3G1 , Canada
| | - Peng Wu
- State Key Laboratory of Hydraulics and Mountain River Engineering , Sichuan University , Chengdu 610065 , China
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