Journal of Environmental Chemical Engineering
·
2021
·Vol. 9
·期 4
·105292
·
IF 5.909
Jie Zhou,Wenyi Cai,Jing Ding,Hui Wan,Guofeng Guan
The appropriate construct of Z-scheme heterostructure composite with high photocatalytic activity has created new opportunities for environmental protection. Herein, graphitic carbon nitride quantum dots/tungsten trioxide (CNQDs/WO 3 ) was firstly fabricated using CNQDs decorated onto the surface of WO 3 nanorod grown along the [110] orientation in hydrothermal environment to construct a Z-scheme heterostructure composite. By various characterization methods, the crystal structure, micro morphology, atomic valence state and surface functional groups of the catalyst were systematically revealed. The results indicated that Z-scheme heterojunctions between CNQDs and WO 3 were successfully constructed. Compared with pure WO 3 , CNQDs/WO 3 exhibited prominent photoreduction performance under visible light irradiation. The optimal 5% CNQDs/WO 3 could reduce almost 100% Cr (VI) under acidic condition with the best photocatalytic activity within 90 min. More than this, 5% CNQDs/WO 3 also displayed excellent stability and recyclability even after five cycles of photoreduction experiments. Based on the free radical quenching experiments, the possible photoreduction reaction mechanism had been proposed in detail. The Z-scheme heterostructure provided the possibility of the generation, rapidly transfer and efficient separation of photogenerated electrons, which were major active species in the Cr (VI) photoreduction process.
研究领域:
环境催化
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材料化学
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纳米科技
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光催化
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环境污染治理
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半导体异质结
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Minmin Liu,Baitong Niu,Hongxu Guo,Shaoming Ying,Zhangxu Chen
g-C 3 N 4 @Ni 3 C nano-sheets have been prepared by a simple pyrolysis under different temperature, and the as-prepared samples have been characterized by many means, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), the Brunauer–Emmett–Teller (BET) and pore size distribution. The as-prepared g-C 3 N 4 @Ni 3 C nano-sheet has been proved to be a versatile functional material, that is the application in supercapacitor electrode materials, hydrogen generation via NaBH 4 hydrolysis and reduction of p– nitrophenol. This method offers a new strategy for preparation of environmental energy materials through simple raw materials.
研究领域:
材料科学
·
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 12
·4360-4367
·
IF 4.099
Erbing Hua,Gang Liu,Guan Zhang,Xiaoxiang Xu
Separation of photo-generated electron–hole pairs plays a crucial role in determining the practical performance of semiconductor photocatalysts. Here we have successfully fabricated two dimensional g-C3N4/Ba5Ta4O15 nanosheet heterostructures through an in situ urea degradation method. The so-formed nanosheet heterostructures demonstrate superior photocatalytic activities in H2 evolution reactions over individual component. Further analysis using photoelectrochemical measurements suggests efficient charge separations at the interfaces of these heterostructures which contribute to a prolonged lifetime of photo-generated charges as well as the much enhanced photocatalytic activities. The in situ fabrication method adopted in this work ensures a firm anchorage of g-C3N4 onto Ba5Ta4O15 nanosheets and a face-to-face contact between these two semiconductors. Such a peculiar microstructure is critical to the high photocatalytic activity and apparently outweighs the conventional ones that involve only physical mixtures of two semiconductors and a point-to-point contact.
研究领域:
材料科学
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光催化
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纳米材料
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能源化学
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半导体物理
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 37
·22987-22997
·
IF 3.945
Long Shi,Juanqin Xue,Wen Xiao,Peng Wang,Mingyang Long,Qiang Bi
The coal chemical industry generates large amounts of solid waste and volatile organic compounds (VOCs). In this study, the solid waste semi-coke powder obtained in the semi-coke production process was used as a raw material to prepare high-specific surface area semi-coke activated carbon (SAC) by a carbonization and activation process, and a ternary z-scheme heterojunction photocatalyst with high catalytic performance was loaded for synergistic treatment by adsorption and photodegradation to achieve waste treatment with waste. The prepared semi-coke activated carbon has a specific surface area of 619.27 m2 g−1, which can achieve effective adsorption of VOCs. The ternary z-scheme heterojunction photocatalyst BiPO4–BiVO4–g-C3N4 (PVCN) was supported on a semi-coke activated carbon substrate by a one-step sol–gel method. Based on the synergistic effect of adsorption and photocatalysis, the obtained PVCN/SAC material can degrade toluene by 85.6% within 130 minutes under simulated sunlight irradiation, which is 2.43 times that of pure photocatalyst. The rate of degrading toluene can be increased by 4.43 times. Capture experiments showed that superoxide radicals (˙O2−) and hydroxyl radicals (˙OH) were the key active species in the degradation pathway. Even after five cycles, the material maintained 81.6% of the degradation performance. In this work, we deeply investigate the mechanism of semi-coke activated carbon as a matrix for enhancing photocatalytic degradation performance. The findings of this work provide new insights into the efficient degradation of VOCs and provide a good theoretical basis for the development of high-performance photocatalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Hongyang Pan,Jiamin Gu,Kaiyang Hou,Junyao Li,Yu Wang,Yiying Yue
Photocatalytic technology has received considerable attention due to its advantages of high efficiency, economy and thorough degradation of pollutants, making it the most promising sewage treatment technology. However, the difficulty in recycling usually limits its applications. In our research, we developed a composite aerogel with excellent mechanical properties, photocatalytic properties and recyclability to adsorb and degrade rhodamine B (RhB) dye. In this composite, g-C 3 N 4 /BiOBr was loaded on the matrix of rGO and chitosan (CS), with borax as the crosslinking agent. The adsorption experiment showed that the equilibrium adsorption capacity of g-C 3 N 4 /BiOBr@CS/rGA aerogels were 3.08 mg/g. The composite photocatalyst of g-C 3 N 4 /BiOBr could effectively inhibit the recombination of photo-generated carriers, loaded on the rGO matrix with admirable conductivity, which further improved the photocatalytic performance. The degradation rate of RhB could reach to 94.6% at 180 min under the neutral condition of pH= 7. In addition, the amine group of CS reacted with the carboxyl group of GO to form an amide group, it enhanced the mechanical properties of the aerogels. The compressive strength was 0.152 MPa at 50% strain, and there was basically no decrease after 5 cycles. The composite aerogels exhibited good recycling performance, and the degradation rate was about 80% after 4 cycles.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jinge Du,Shuanglong Ma,Na Zhang,Wenjing Liu,Mengdi Lv,Tianjun Ni,Zhen An,Kai Li,Yichun Bai
A novel porous Z-scheme Ag/AgFeO 2 /g-C 3 N 4 (AAF/UPCN) photocatalyst was successfully prepared via a facile hydrothermal, precipitation and photo-deposition–method. Under visible light irradiation, AAF/UPCN exhibited excellent bisphenol A degradation effect and Staphylococcus aureus inactivation effect compared with porous g-C 3 N 4 (UPCN) and AgFeO 2 . The •O 2 ‾ was the major active species during the photocatalytic degradation process. For the photocatalytic mechanism, the photoexcited electrons of UPCN transferred to AgFeO 2 mediated by Ag nanoparticles . This charge migration and separation route was verified collectively by the PL spectra, photoelectrochemical characterizations, chemical scavenger experiments and ESR measurements. Furthermore, the band distribution of catalysts was obtained by DFT calculation. This Ag nanoparticles mediated electron transfer pathway could promote the effective segregation of photoexcited carriers. The synergistic effect of UPCN, AgFeO 2 and Ag in heterostructure could promote the efficient separation of photogenerated charge carriers. This study provides a new strategy for rational design of high-efficient g-C 3 N 4 -based photocatalysts for environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Rui Li,Yuling Ren,Peixia Zhao,Jing Wang,Jindun Liu,Yatao Zhang
Membrane fouling significantly impedes membrane performance and thus short lifespan of the membrane. Membranes that functionalized with photocatalytic activity are deemed as an effective and novel approach to settle membrane fouling. The membranes with self-cleaning and antibacterial performance were fabricated via facilely filtering g-C 3 N 4 nanosheets onto polyacrylonitrile (PAN) porous substrates. The g-C 3 N 4 nanosheets were exfoliated by acid etching and ultrasound treatment, and the exfoliated nanosheets was verified by Fourier transform infrared spectra, Atomic force microscopy and X-ray diffraction. The g-C 3 N 4 nanosheets functionalized composite membranes have a water permeability of 11.70 L m −2 h -1 bar -1 and a good antibacterial activity. In addition, the membranes could be restored their original permeability and their surfaces were close to initial color even after three cycles rejecting dyes and post treatment under irradiation with visible light. Besides, the degradable and antimicrobial mechanisms of the membranes were investigated respectively. These g-C3N4 nanosheets composite membranes with self-cleaning and antimicrobial properties have a potential feasibility in water treatment, and provide an alternative method for fabricating self-cleaning membranes.
研究领域:
材料科学
·
环境工程
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Kai Wei,Kexin Li,Liushui Yan,Shenglian Luo,Huiqin Guo,Yuhua Dai,Xubiao Luo
In this paper, graphitic carbon nitride nanosheets/titanium dioxide hollow microspheres heterojunctions (g-C 3 N 4 NSs/TiO 2 HMSs) with excellent photocatalytic activity were successfully fabricated by a simple one-step synthesis strategy in the assistance of hydrothermal carbon microspheres. Hydrothermal carbon microspheres act as both dispersant and structure-directing agent for the simultaneous construction of graphitic carbon nitride nanosheets and titanium dioxide hollow microspheres. The synergistic photocatalytic effects in the 4-fluorophenol/hexavalent chromium [4-FP/Cr(VI)] and hexavalent chromium/trivalent arsenic [Cr(VI)/As(III)] multi-component composite pollution systems were studied by using as-prepared g-C 3 N 4 NSs/TiO 2 HMSs under different pH conditions. Interestingly, the efficiencies of 4-FP degradation, Cr(VI) reduction, and As(III) oxidation were simultaneously improved in the 4-FP/Cr(VI) and Cr(VI)/As(III) multi-component synergistic photocatalytic systems relative to the single-component photocatalytic systems. The synergistic photocatalytic mechanisms in the 4-FP/Cr(VI) and Cr(VI)/As(III) multi-component synergistic photocatalytic systems were systematically discussed.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Wei Jiang,Pinghua Chen,Xueqin Li,Guanghui Wu,Huitao Zheng,Chenxuan Li,Lei Fang,Hualin Jiang
Electrochemical analysis using specifically designed electrodes represents a promising strategy to detect organic pollutants, such as 4-nitrophenol (4-NP), in the environment. Towards this goal, a metal-free composite of phenanthroline doped graphitic carbon nitride (g-C 3 N 4 -PD) was synthesized, characterized, and applied as the electrode materials for electrochemical detection of 4-NP in water. The phenanthroline doping simultaneously extends the π-conjugation system of g-C 3 N 4 , and creates defect sites in g-C 3 N 4 , leading to better conductivity, higher 4-NP adsorption, and significantly enhanced electrocatalytic activity . Electrochemical sensors were fabricated by using g-C 3 N 4 -PD-modified carbon electrode. They showed a broad detection concentration range of 2.854–1117 μM and a low detection limit of 39 nM for 4-NP, with high reproducibility, stability and selectivity . Reliable and accurate measurements of 4-NP in real-life water samples have been demonstrated using these electrodes.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Yanyan Wang,Xin Ding,Ping Zhang,Qi Wang,Kang Zheng,Lin Chen,Jianjun Ding,Xingyou Tian,Xian Zhang
In this work, a TiO2/g-C3N4 photocatalytic coating is built on cotton fabrics with a simple layer-by-layer (LBL) self-assembly strategy in which TiO2 and g-C3N4 are alternately assembled on cotton fabrics via electrostatic attraction. The fabrics, as support, disperse TiO2/g-C3N4 powder photocatalyst to expose more active sites. The fabrics also act as an adsorbent to boost the pollutants capture. Consequently, the coated fabrics exhibit an outstanding photocatalytic property applicable for degradation of both liquid rhodamine (RhB) and gaseous toluene pollutants. The fabric with seven bilayer coatings shows the best for RhB decomposition with degradation rate of 92.5%. Over 90% toluene could be eliminated by the photocatalytic coating under simulated sunlight irradiation. Besides, the coating fabrics show excellent stability and reusability.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 59
·34658-34670
·
IF 3.049
Xiangyu Wang,Yu Xie,Jun Ma,Ping Ning
The two-stage removal process of tetracycline (TC) in aqueous solutions using a novel photocatalyst based on nano-zero-valent iron (NZVI), g-C3N4 and expanded graphite by carbon layer (EGC) is reported for the first time. The composite (NZVI/g-C3N4@EGC) exhibits remarkable adsorption, reduction ability and visible light activity over the reaction course. Compared with pristine g-C3N4 (25.9%) and pure NZVI (45.9%), NZVI/g-C3N4@EGC achieves high degradation efficiency of TC (98.5%) due to the formation of a heterogeneous photo-Fenton system. This study shows that synergistic effects are achieved in the reaction system, including maintaining the reduction ability of NZVI and enhancing the photocatalytic activity of g-C3N4 by facilitating the separation of photogenerated electrons (e−) and holes (h+). TC removal involved a two-stage process of adsorption–reduction and photo-degradation. The quencher experiments determined that holes (h+) and superoxide radicals (˙O2−) are the major reactive species in the degradation of TC. The degradation pathways of TC were proposed based on the analysis of the intermediates. In addition, NZVI/g-C3N4@EGC revealed a high stability in a five-cycle test and good magnetic properties for facile separation from aqueous solutions. From an application viewpoint, NZVI/g-C3N4@EGC has favorable prospects in the direction of the photocatalytic degradation of antibiotic wastewater.
研究领域:
环境化学
·
材料科学
·
光催化
·
水污染治理
·
纳米复合材料
·
抗生素降解
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Tingting Yu,Qingsong Liu,Guang Chen,Lifen Liu,Jinlong Zhang,Changfei Gao,Tao Yang
A novel heterostructure of g-C 3 N 4 /ZnO/Bi 4 O 5 Br 2 (ZB-3) was designed, and used in the microbial coupled photocatalytic fuel cell (MPFC). It can effectively improve electron utilization efficiency and pollutant degradation using this double Z-scheme heterojunction structure . The current–time ( I – t ) curves demonstrated that the current density of ZB-3 was higher than that of ZnO, ZnO/Bi 4 O 5 Br 2 (ZB-1), g-C 3 N 4 /ZnO (ZB-2). Electrochemical impedance spectroscopy (EIS) indicated ZB-3 possessed the minimum charge-transfer resistance. This MPFC for degrading rhodamine B (RhB) and tetracycline (TC) under different conditions were developed using these materials. Even in the dark condition, MPFC with g-C 3 N 4 /ZnO/Bi 4 O 5 Br 2 demonstrated 93% and 82% degradation efficiency for RhB and TC, respectively. Furthermore, the electron transport mechanism of the MPFC and ZB-3 were proposed. It paves the approach for more efficient pollutant degradation via MFC photocatalysis .
研究领域:
环境科学
·
能源材料
·
电化学
·
光催化
·
水处理技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）