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Li Y, Cheng L, Yang B, Ding Y, Zhao Y, Wu Y, Nie Y, Liu Y, Xu A. Zinc oxide/graphene oxide nanocomposites specifically remediated Cd-contaminated soil via reduction of bioavailability and ecotoxicity of Cd. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 940:173641. [PMID: 38825205 DOI: 10.1016/j.scitotenv.2024.173641] [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: 01/19/2024] [Revised: 03/22/2024] [Accepted: 05/28/2024] [Indexed: 06/04/2024]
Abstract
From both environment and health perspectives, sustainable management of ever-growing soil contamination by heavy metal is posing a serious global concern. The potential ecotoxicity of cadmium (Cd) to soil and ecosystem seriously threatens human health. Developing efficient, specific, and long-term remediation technology for Cd-contaminated soil is impending to synchronously minimize the bioavailability and ecotoxicity of Cd. In the present study, zinc oxide/graphene oxide nanocomposite (ZnO/GO) was developed as a novel amendment for remediating Cd-contaminated soil. Our results showed that ZnO/GO effectively decreased the available soil Cd content, and increased pH and cation exchange capacity (CEC) in both Cd-spiked standard soil and Cd-contaminated mine field soil through the interaction between ZnO/GO and soil organic acids. Using Caenorhabditis elegans (C. elegans) as a model organism for soil safety evaluation, ZnO/GO was further proved to decrease the ecotoxicity of Cd-contaminated soil. Specifically, ZnO/GO promoted Cd excretion and declined Cd storage in C. elegans by increasing the expression of gene ttm-1 and decreasing the level of gene cdf-2, which were responsible for Cd transportation and Cd accumulation, respectively. Moreover, the efficacy of ZnO/GO in remediating the properties and ecotoxicity of Cd-contaminated soil increased gradually with the time gradient, and could maintain a long-term effect after reaching the optimal remediation efficiency. Our findings established a specific and long-term strategy to simultaneously improve soil properties and reduce ecotoxicity of Cd-contaminated soil, which might provide new insights into the potential application of ZnO/GO in soil remediation for both ecosystem and human health.
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Affiliation(s)
- Yang Li
- School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, PR China; Anhui Province Key Laboratory of Environmental Toxicology and Pollution Control Technology, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, CAS, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, CAS, Hefei, Anhui, 230031, PR China
| | - Lei Cheng
- School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, PR China; Anhui Province Key Laboratory of Environmental Toxicology and Pollution Control Technology, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, CAS, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, CAS, Hefei, Anhui, 230031, PR China
| | - Baolin Yang
- School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, PR China; Anhui Province Key Laboratory of Environmental Toxicology and Pollution Control Technology, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, CAS, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, CAS, Hefei, Anhui, 230031, PR China
| | - Yuting Ding
- School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, PR China; Anhui Province Key Laboratory of Environmental Toxicology and Pollution Control Technology, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, CAS, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, CAS, Hefei, Anhui, 230031, PR China
| | - Yanan Zhao
- Anhui Province Key Laboratory of Environmental Toxicology and Pollution Control Technology, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, CAS, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, CAS, Hefei, Anhui, 230031, PR China
| | - Yuanyuan Wu
- School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, PR China; Anhui Province Key Laboratory of Environmental Toxicology and Pollution Control Technology, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, CAS, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, CAS, Hefei, Anhui, 230031, PR China
| | - Yaguang Nie
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, PR China
| | - Yun Liu
- Anhui Province Key Laboratory of Environmental Toxicology and Pollution Control Technology, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, CAS, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, CAS, Hefei, Anhui, 230031, PR China.
| | - An Xu
- School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, PR China; Anhui Province Key Laboratory of Environmental Toxicology and Pollution Control Technology, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, CAS, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, CAS, Hefei, Anhui, 230031, PR China; Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, PR China.
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Kocijan M, Ćurković L, Vengust D, Radošević T, Shvalya V, Gonçalves G, Podlogar M. Synergistic Remediation of Organic Dye by Titanium Dioxide/Reduced Graphene Oxide Nanocomposite. Molecules 2023; 28:7326. [PMID: 37959746 PMCID: PMC10647384 DOI: 10.3390/molecules28217326] [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: 09/23/2023] [Revised: 10/18/2023] [Accepted: 10/26/2023] [Indexed: 11/15/2023] Open
Abstract
In this work, nanocomposites based on titanium dioxide and reduced graphene oxide (TiO2@rGO) with different weight percentages of rGO (4, 8, and 16 wt%) were prepared by the hydrothermal/solvothermal synthesis method and thermally treated at 300 °C. The prepared nanocomposites were explored for the removal of methylene blue dye (MB) in the presence of simulated solar illumination as well as natural sunlight. The structural, morphological, chemical, and optical properties of the as-synthesized TiO2@rGO nanocomposites were characterized. The obtained results of the graphene-based nanocomposite materials indicated the existence of interactions between TiO2 and rGO, i.e., the Ti-O-C bond, which confirmed the successful integration of both components to form the TiO2@rGO nanocomposites. The addition of rGO increased the specific surface area, decreased the band gap energy, and increased the photocatalytic degradation efficiency of MB from water compared to TiO2 nanoparticles. The results of photocatalytic activity indicated that the amount of rGO in the prepared TiO2@rGO nanocomposites played a significant role in the application of different photocatalytic parameters, including the initial dye concentration, catalyst concentration, water environment, and illumination source. Our studies show that the reinforcement of the nanocomposite with 8 wt% of rGO allowed us to obtain the maximum photocatalytic decomposition performance of MB (10 mg·L-1) with a removal percentage of 99.20 after 2 h. Additionally, the obtained results show that the prepared TiO2@rGO_8 wt% nanocomposite can be used in three consecutive cycles while maintaining photocatalytic activity over 90%.
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Affiliation(s)
- Martina Kocijan
- Department of Materials, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000 Zagreb, Croatia
| | - Lidija Ćurković
- Department of Materials, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000 Zagreb, Croatia
| | - Damjan Vengust
- Advanced Materials Department, Jožef Stefan Institute, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia;
| | - Tina Radošević
- Department for Nanostructured Materials, Jožef Stefan Institute, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia; (T.R.); (M.P.)
| | - Vasyl Shvalya
- Department of Gaseous Electronics, Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia;
| | - Gil Gonçalves
- Centre for Mechanical Technology and Automation (TEMA), Mechanical Engineering Department, University of Aveiro, 3810-193 Aveiro, Portugal;
- Intelligent Systems Associate Laboratory (LASI), 4800-058 Guimarães, Portugal
| | - Matejka Podlogar
- Department for Nanostructured Materials, Jožef Stefan Institute, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia; (T.R.); (M.P.)
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Derakhshani E, Naghizadeh A, Arab-Zozani M, Farkhondeh T. A systematic review of photocatalytic degradation of humic acid in aqueous solution using nanoparticles. REVIEWS ON ENVIRONMENTAL HEALTH 2023; 38:577-587. [PMID: 35735094 DOI: 10.1515/reveh-2022-0046] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
OBJECTIVES Humic acid (HA) compounds in the disinfection processes of drinking water and wastewater are considered as precursors of highly toxic, carcinogenic and mutagenic disinfectant by-products. The aim of this study was to systematically review all research studies on the photocatalytic degradation of humic acid and to evaluate the laboratory conditions and results of these studies. CONTENT The present systematic review was performed by searching the Scopus, PubMed, and web of science databases until December 2021. The parameters of type of catalyst, catalyst size, optimum pH, optimum initial concentration of humic Acid, optimum catalyst concentration, optimum time, light used and removal efficiency were investigated. SUMMARY 395 studies were screened and using the inclusion and exclusion criteria, in total, 20 studies met our inclusion criteria and provided the information necessary to Photocatalytic degradation of humic acid by nanoparticles. In the investigated studies, the percentage of photocatalytic degradation of humic acid by nanoparticles was reported to be above 70%, and in some studies, the removal efficiency had reached 100%. OUTLOOK From the results of this systematic review, it was concluded that the photocatalytic process using nanoparticles has a high effect on the degradation of humic acid.
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Affiliation(s)
- Elham Derakhshani
- Medical Toxicology and Drug Abuse Research Center (MTDRC), Birjand University of Medical Sciences (BUMS), Birjand, Iran
| | - Ali Naghizadeh
- Medical Toxicology and Drug Abuse Research Center (MTDRC), Birjand University of Medical Sciences (BUMS), Birjand, Iran
| | - Morteza Arab-Zozani
- Social Determinants of Health Research Center, Birjand University of Medical Sciences (BUMS), Birjand, Iran
| | - Tahereh Farkhondeh
- Medical Toxicology and Drug Abuse Research Center (MTDRC), Birjand University of Medical Sciences (BUMS), Birjand, Iran
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Pete KY, Kabuba J, Otieno B, Ochieng A. Modeling adsorption and photocatalytic treatment of recalcitrant contaminant on multi-walled carbon/TiO 2 nanocomposite. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:94154-94165. [PMID: 37526826 PMCID: PMC10468944 DOI: 10.1007/s11356-023-28852-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 07/14/2023] [Indexed: 08/02/2023]
Abstract
A nanocomposite photocatalyst consisting of titanium dioxide (TiO2) supported on multiwalled carbon nanotubes (MWCNTs) has been successfully prepared and used for the treatment of wastewater contaminated with tetracycline (TC), a recalcitrant antibiotic pollutant. The TiO2/MCNT composites were prepared by a simple evaporation-drying method. The properties of MWCNT/TiO2 were optimized by dispersing different amounts of TiO2 onto MWCNT. The structural and optical characteristics of the nano-engineered photocatalyst composite were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR) techniques. Photocatalytic degradation of TC was conducted in a quartz glass reactor. Different kinetic models were used to demonstrate the governing mechanisms. The findings revealed that the TiO2/MWCNT composite had enhanced photocatalytic activity (95% TC removal) compared to TiO2 (86% removal). The photocatalyst nanocomposite exhibited overall pseudo-second-order reaction kinetics and favored the Langmuir adsorption isotherm. Although up to 95% degradation of TC was achieved, only 75% of it was mineralized as a result of the formation of stable refractory intermediates.
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Affiliation(s)
- Kwena Yvonne Pete
- Department of Chemical and Metallurgical Engineering, Vaal University of Technology, Vanderbijlpark, South Africa.
| | - John Kabuba
- Department of Chemical and Metallurgical Engineering, Vaal University of Technology, Vanderbijlpark, South Africa
| | - Benton Otieno
- Department of Chemical and Metallurgical Engineering, Vaal University of Technology, Vanderbijlpark, South Africa
| | - Aoyi Ochieng
- Botswana International University of Science and Technology, Private Bag 16, Palapye, Botswana
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Sinha R, Ghosal PS. A comprehensive appraisal on status and management of remediation of DBPs by TiO 2 based-photocatalysts: Insights of technology, performance and energy efficiency. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 328:117011. [PMID: 36525732 DOI: 10.1016/j.jenvman.2022.117011] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 12/08/2022] [Accepted: 12/08/2022] [Indexed: 06/17/2023]
Abstract
Disinfection has been acknowledged as an inevitable technique in water treatment. However, an inadvertent consequence of generation of carcinogenic and mutagenic disinfection byproducts (DBPs) is associated with the reaction of disinfectants and natural organic matter (NOM) present in water. More than 700 DBPs have been identified in drinking water. The conventional processes carried out in WTPs do not optimally ensure NOM elimination, which evokes the need for the incorporation of other processes. In this context, several physicochemical and advanced oxidation processes (AOP), such as adsorption, membrane techniques, photocatalysis, etc., have been studied for the removal of NOM from water. Photocatalysis using semiconductors has been one of the most proficient technologies, which utilizes light energy for the degradation of recalcitrant organics. The present study aims to provide a comprehensive appraisal on the performance of titanium dioxide (TiO2) based photocatalysts in the remediation of DBPs concerning the efficacy and energy requirements of the system. Furthermore, the effect of process parameters, such as pH, catalyst dose, light intensity, etc. on the efficacy of the process was also studied. It was observed that conventional P25-TiO2 powders were efficient in the degradation of dissolved organic carbon (DOC) (up to 90%). However, low photocatalytic activity under visible light activation is one of its significant downsides. Several modifications on the catalyst surface in many studies exhibited advantages, such as high humic acid (HA) degradation under visible light. Furthermore, doped TiO2 catalysts have shown high total organic carbon (TOC) degradation. The photocatalytic systems have achieved a better decrease in trihalomethane formation potential (THMFP) when compared to haloacetic acid formation potential (HAAFP). The energy requirements of the photocatalytic systems are determined by electrical energy per order (EE/O), which has been observed to be lesser for doped TiO2 and engineered TiO2 catalysts when compared with P25-TiO2 powders. Carbon, iron, silver, etc., based catalysts can be a promising alternative to TiO2-based photocatalysts for the degradation of NOM, although further research is required in this direction. The present review provides critical highlights on the uses, opportunities, and challenges of TiO2-based photocatalytic techniques for the management of DBPs and their precursors pertaining to an emerging area of water treatment.
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Affiliation(s)
- Rupal Sinha
- School of Water Resources, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
| | - Partha Sarathi Ghosal
- School of Water Resources, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
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Krishnan SAG, Abinaya S, Arthanareeswaran G, Govindaraju S, Yun K. Surface-constructing of visible-light Bi 2WO 6/CeO 2 nanophotocatalyst grafted PVDF membrane for degradation of tetracycline and humic acid. JOURNAL OF HAZARDOUS MATERIALS 2022; 421:126747. [PMID: 34364210 DOI: 10.1016/j.jhazmat.2021.126747] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 07/13/2021] [Accepted: 07/24/2021] [Indexed: 06/13/2023]
Abstract
The synthesis of Bi2WO6 and CeO2 photocatalytic nanomaterials exhibit a great ability to photodegrade the antibiotics and shown excellent oxidation of various organic pollutants. Heterostructure 1:1 & 2:1 Bi2WO6/CeO2 nanocomposite was successfully synthesized via the facile sono-dispersion method and exquisite photocatalytic activity. The 0.5 wt% of nanocomposites were well-grafted on PVDF membrane surface via an in-situ polymerization method using polyacrylic acid. The fourier transform infrared (FTIR) spectra demonstrated that the network formation in PVDF induced by the -COOH functional group in acrylic acid. The grafted membrane morphology and strong binding ability over the membranes were validated by scanning electron microscope with energy dispersion (SEM-EDS) and X-ray photoelectron spectroscopy (XPS), respectively. The permeate flux of 49.2 L.m-2 h-1 and 41.65 L.m-2 h were observed for tetracycline and the humic acid solution respectively for 1 wt% of PVP and 0.5 wt% of photocatalytic nanomaterials in PVDF membrane. The tetracycline and humic acid photodegradation rate of 82% and 78% and total resistance of 1.43 × 1010 m-1 and 1.64 × 1010 m-1, 83.5% and 77% flux recovery ratio were observed with N5 membrane. The 2:1 Bi2WO6/CeO2 nanocomposite grafted membrane showed a high permeate flux and better photodegradation ability of organic pollutants in the wastewater.
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Affiliation(s)
- S A Gokula Krishnan
- Membrane Research Laboratory, Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli, India 620015
| | - S Abinaya
- Membrane Research Laboratory, Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli, India 620015
| | - G Arthanareeswaran
- Membrane Research Laboratory, Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli, India 620015.
| | | | - Kyusik Yun
- Department of BioNano Technology, Gachon University, Seongnam-si, South Korea
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Wang G, Wang J, Yu T, Guo X, Chen Y. Efficient removal of humic acid in water using a novel TiO 2 composite with biochar doping. RSC Adv 2022; 12:31966-31975. [PMCID: PMC9641702 DOI: 10.1039/d2ra05358f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Accepted: 10/10/2022] [Indexed: 11/11/2022] Open
Abstract
Titanium dioxide modified with biochar (Ti–C) was prepared by a sol–gel method for the degradation of humic acid (HA) in aqueous solutions.
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Affiliation(s)
- Guoqiao Wang
- College of Architecture and Environment, Sichuan University, Chengdu 610065, China
- Shenyang Municipal Bureau of Public Utilities, Shengyang, 110011, China
| | - Jiawei Wang
- College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Tian Yu
- College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Xin Guo
- Chengdu Academy of Environmental Protection Sciences, Chengdu, 610072, China
| | - Yao Chen
- College of Architecture and Environment, Sichuan University, Chengdu 610065, China
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Influence of Synthesis Approach on Controlled Microstructures and Photocatalytic Properties of Ag/AgBr-Activated Carbon Composites on Visible Light Degradation of Tetracycline. Catalysts 2021. [DOI: 10.3390/catal11111396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The influence of the synthesis approach (thermal polyol and deposition–precipitation) regarding the dispersion of Ag/AgBr nanoparticles dispersed on activated carbon prepared from chemical impregnated pinecone (TP-AABR-ACK, and DP-AABR-ACK) was studied, to increase their photocatalytic efficiency on the degradation of tetracycline (TC). The physicochemical characterization evidenced the significance of the ACK catalyst promoter in enhancing controlled microstructures (morphologies and particle size distributions), synergistic interface interaction between AABR NPs and the carbonaceous support, and efficient photogenerated charge carriers separation within TP-AABR-ACK, and DP-AABR-ACK composites. The results revealed 92% removal of TC within 180 min under the LED visible light irradiation, which was achieved using TP-AABR-ACK when compared to DP-AABR-ACK composite and other catalysts in this study. Such superior results achieved with TP-AABR-ACK composite were attributed to controlled morphologies, reduced particle size and agglomeration, improved absorptivity, and superior cooperative effect between the AABR and ACK catalyst promoter as evidenced from SEM, EDX, TEM, UV-DRS, and electrochemical characterizations, respectively. Furthermore, enhanced TOC removal and abundance of reactive superoxide anion generation were achieved with the TP-AABR-ACK composite in this study.
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Yang H, Luo B, Lei S, Wang Y, Sun J, Zhou Z, Zhang Y, Xia S. Enhanced humic acid degradation by Fe3O4/ultrasound-activated peroxymonosulfate : Synergy index, non-radical effect and mechanism. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118466] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Graphene-Based TiO2 Nanocomposite for Photocatalytic Degradation of Dyes in Aqueous Solution under Solar-Like Radiation. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11093966] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
This study presents a novel method for the development of TiO2/reduced graphene oxide (rGO) nanocomposites for photocatalytic degradation of dyes in an aqueous solution. The synergistic integration of rGO and TiO2, through the formation of Ti–O–C bonds, offers an interesting opportunity to design photocatalyst nanocomposite materials with the maximum absorption shift to the visible region of the spectra, where photodegradation can be activated not only with UV but also with the visible part of natural solar irradiation. TiO2@rGO nanocomposites with different content of rGO have been self-assembled by the hydrothermal method followed by calcination treatment. The morphological and structural analysis of the synthesized photocatalysts was performed by FTIR, XRD, XPS, UV-Vis DRS, SEM/EDX, and Raman spectroscopy. The effectiveness of the synthesized nanocomposites as photocatalysts was examined through the photodegradation of methylene blue (MB) and rhodamine B (RhB) dye under artificial solar-like radiation. The influence of rGO concentration (5 and 15 wt.%) on TiO2 performance for photodegradation of the different dyes was monitored by UV-Vis spectroscopy. The obtained results showed that the synthesized TiO2@rGO nanocomposites significantly increased the decomposition of RhB and MB compared to the synthesized TiO2 photocatalyst. Furthermore, TiO2@rGO nanocomposite with high contents of rGO (15 wt.%) presented an improved performance in photodegradation of MB (98.1%) and RhB (99.8%) after 120 min of exposition to solar-like radiation. These results could be mainly attributed to the decrease of the bandgap of synthesized TiO2@rGO nanocomposites with the increased contents of rGO. Energy gap (Eg) values of nanocomposites are 2.71 eV and 3.03 eV, when pure TiO2 particles have 3.15 eV. These results show the potential of graphene-based TiO2 nanocomposite to be explored as a highly efficient solar light-driven photocatalyst for water purification.
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Effective Strategies, Mechanisms, and Photocatalytic Efficiency of Semiconductor Nanomaterials Incorporating rGO for Environmental Contaminant Degradation. Catalysts 2021. [DOI: 10.3390/catal11030302] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The water pollution problems severely affect the natural water resources due to the large disposal of dyes, heavy metals, antibiotics, and pesticides. Advanced oxidation processes (AOP) have been developed using semiconductor nanomaterials as photocatalysts for water treatment as an essential strategy to minimize environmental pollution. Significant research efforts have been dedicated over the past few years to enhancing the photocatalytic efficiencies of semiconductor nanomaterials. Graphene-based composites created by integrating reduced graphene oxide (rGO) into various semiconductor nanomaterials enable the unique characteristics of graphene, such as the extended range of light absorption, the separation of charges, and the high capacity of adsorption of pollutants. Therefore, rGO-based composites improve the overall visible-light photocatalytic efficiency and lead to a new pathway for high-performance photocatalysts’ potential applications. This brief review illustrates the strategies of combining rGO with various semiconductor nanomaterials and focuses primarily on modification and efficiency towards environmental contaminants.
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12
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Zhou XF, Liang JP, Zhao ZL, Yuan H, Qiao JJ, Xu QN, Wang HL, Wang WC, Yang DZ. Ultra-high synergetic intensity for humic acid removal by coupling bubble discharge with activated carbon. JOURNAL OF HAZARDOUS MATERIALS 2021; 403:123626. [PMID: 32795816 DOI: 10.1016/j.jhazmat.2020.123626] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 06/29/2020] [Accepted: 07/27/2020] [Indexed: 06/11/2023]
Abstract
Humic acid (HA) removal research focuses on the global water treatment industry. In this work, efficient HA degradation with an ultra-high synergetic intensity is achieved by combined bubble discharge with activated carbon (AC). Adding AC to the discharge greatly improves HA removal efficiency and degradation speed; the synergetic intensity reaches 651.52% in the combined system, and the adsorption residual on AC is 4.52%. After 90 min of treatment, the HA removal efficiency reaches 98.90%, 31.29%, and 7.61% in the plasma-AC combined, solo bubble discharge, and solo AC adsorption systems, respectively. During the plasma process, the number of pore structures and active sites and the amount of oxygen-containing functional groups on the AC surface increase, resulting in a higher adsorption capacity to reactive species (H2O2 and O3) and HA and promoting interactions on the AC surface. For HA mineralization, the presence of AC greatly promotes the destruction of aromatic structures and chromophoric HA functional groups.
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Affiliation(s)
- Xiong-Feng Zhou
- Key Lab of Materials Modification, Ministry of Education, Dalian University of Technology, Dalian, 116024, China
| | - Jian-Ping Liang
- Key Lab of Materials Modification, Ministry of Education, Dalian University of Technology, Dalian, 116024, China
| | - Zi-Lu Zhao
- Key Lab of Materials Modification, Ministry of Education, Dalian University of Technology, Dalian, 116024, China
| | - Hao Yuan
- Key Lab of Materials Modification, Ministry of Education, Dalian University of Technology, Dalian, 116024, China
| | - Jun-Jie Qiao
- Key Lab of Materials Modification, Ministry of Education, Dalian University of Technology, Dalian, 116024, China
| | - Qing-Nan Xu
- Key Lab of Materials Modification, Ministry of Education, Dalian University of Technology, Dalian, 116024, China
| | - Hong-Li Wang
- Key Lab of Materials Modification, Ministry of Education, Dalian University of Technology, Dalian, 116024, China
| | - Wen-Chun Wang
- Key Lab of Materials Modification, Ministry of Education, Dalian University of Technology, Dalian, 116024, China.
| | - De-Zheng Yang
- Key Lab of Materials Modification, Ministry of Education, Dalian University of Technology, Dalian, 116024, China; College of Sciences, Shihezi University, Shihezi, 832003, China.
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13
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Paul G, Verma S, Jalil O, Thakur D, Pandey CM, Kumar D. PEDOT
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PSS
‐grafted graphene oxide‐titanium dioxide nanohybrid‐based conducting paper for glucose detection. POLYM ADVAN TECHNOL 2021. [DOI: 10.1002/pat.5213] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Geetu Paul
- Department of Applied Chemistry Delhi Technological University Delhi India
| | - Sakshi Verma
- Department of Applied Chemistry Delhi Technological University Delhi India
| | - Owais Jalil
- Department of Applied Chemistry Delhi Technological University Delhi India
| | - Deeksha Thakur
- Department of Applied Chemistry Delhi Technological University Delhi India
| | | | - Devendra Kumar
- Department of Applied Chemistry Delhi Technological University Delhi India
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14
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Pirsaheb M, Hoseini H, Abtin V. Photoelectrocatalytic degradation of humic acid and disinfection over Ni TiO2-Ni/ AC-PTFE electrode under natural sunlight irradiation: Modeling, optimization and reaction pathway. J Taiwan Inst Chem Eng 2021. [DOI: 10.1016/j.jtice.2020.12.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Cai J, Hu S, Xiang J, Zhang H, Men D. The effect of graphitized carbon on the adsorption and photocatalytic degradation of methylene blue over TiO 2/C composites. RSC Adv 2020; 10:40830-40842. [PMID: 35519181 PMCID: PMC9057691 DOI: 10.1039/d0ra01105c] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 10/02/2020] [Indexed: 11/21/2022] Open
Abstract
The TiO2/C composites with approximately 40 wt% of carbon were prepared by calcination of precursors, formed from a one-pot liquid phase reaction between Ti(SO4)2 and flour. All TiO2/C composites displayed mesoporous structures with high BET surface areas (117-138 m2 g-1) and small crystal sizes of TiO2 (8-27 nm). The contents of graphitic carbon and rutile TiO2 increased, while the surface area and TiO2 crystal size decreased for the TiO2/C composite on increasing the calcination temperature from 650 to 800 °C; when calcinated at 800 °C, the anatase TiO2 completely changed into rutile TiO2 in the TiO2/C composite. The TiO2/C composite calcinated at higher temperatures exhibited better adsorptive and photocatalytic degradation performance in the removal of methylene blue (MB). For the entire rutile TiO2/C-800 composite, the adsorption process of MB can be well described by the pseudo-second-order kinetic model and is governed by chemical adsorption with the maximum adsorption capacity value equal to about 15 mg g-1. Under continuous illumination with a 254 nm UV lamp (15 W) for 3 h, the percentage of MB (14 mg l-1) photocatalytic degradation on 50 mg of TiO2/C-800 was 25.1% higher than that of the maximum adsorption removal. These results suggest that the graphitized carbon has a significant effect on the adsorptivity and photocatalytic activity of the TiO2/C composite.
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Affiliation(s)
- Jinlu Cai
- Jiangxi Key Laboratory of Surface Engineering, School of Materials and Mechanical & Electrical Engineering, Jiangxi Science and Technology Normal University Xuefu Road 589 Nanchang 330038 China
| | - Shenghua Hu
- Jiangxi Key Laboratory of Surface Engineering, School of Materials and Mechanical & Electrical Engineering, Jiangxi Science and Technology Normal University Xuefu Road 589 Nanchang 330038 China
| | - Junhuai Xiang
- Jiangxi Key Laboratory of Surface Engineering, School of Materials and Mechanical & Electrical Engineering, Jiangxi Science and Technology Normal University Xuefu Road 589 Nanchang 330038 China
| | - Honghua Zhang
- Jiangxi Key Laboratory of Surface Engineering, School of Materials and Mechanical & Electrical Engineering, Jiangxi Science and Technology Normal University Xuefu Road 589 Nanchang 330038 China
| | - Dandan Men
- Jiangxi Key Laboratory of Surface Engineering, School of Materials and Mechanical & Electrical Engineering, Jiangxi Science and Technology Normal University Xuefu Road 589 Nanchang 330038 China
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