MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
·
IF 3.927
Yifan Liu,Yan Luo,Mingliang Li,Lixia Yang
A novel Bi 2 MoO 6 (BMO) modified g-C 3 N 4 heterostructure composite photocatalyst (g-C 3 N 4 /BMO) was prepared by hydrothermal method . The orthorhombic crystal phase of the material was studied by the X-ray diffraction assay (XRD). The microscopic morphology of the material was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), indicating a heterojunction structure of the composite. The electrons and holes separation was evaluated by photo-luminescence (PL) and photocurrent measurements. The removal rate of O-Nitrophenol was as high as 97.3% over the catalyst with the optimal ratio of 1: 0.09 (BMO:g-C 3 N 4 ) in 180 min. COD removal percentage of actual pharmaceutical wastewater was as high as 71.40%. The active species in the photocatalytic system were studied, indicating superoxide radicals ( · O 2 - ) and holes (h + ) as the main active species.
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CHEMOSPHERE
·
2021
·
IF 7.086
Qimao Gan,Yangyi Xiao,Chenxing Li,Huan Peng,Tuqiao Zhang,Miaomiao Ye
Currently, seawater desalination based on air-water interface solar heating has triggered significant research interests because it effectively makes use of the solar energy and avoids fossil fuel consumption. However, to prevent the volatile organic compounds (VOCs) from volatilizing with water vapor which later will liquefy and enter the condensed freshwater is still a challenge. In this work, a g-C 3 N 4 /MoS 2 based floating solar still (CM-FSS) combined with thermal/light activation of persulfate (PS) at air-water interface was applied for clean freshwater production for the first time. The CM-FSS was composed of a g-C 3 N 4 /MoS 2 top layer for solar absorption, simultaneous thermal/light activation of PS and then VOCs degradation at air-water interface, a floating layer of expandable polyethylene (EPE) foam for heat isolation, and a transport channel of air-laid paper (ALP) for seawater and PS solution delivery. The water evaporation rate of the CM-FSS was measured at 1.23 kg m −2 h −1 under 1 kW m −2 , which is 4.09 times higher than that of pure water without an evaporator. With the assistance of g-C 3 N 4 /MoS 2 photocatalytic degradation and thermal/light activation of PS at the air-water interface, a high removal efficiency of a selected model VOCs pollutant of nitrobenzene (NB) could reach to 98.2% in condensed freshwater. Finally, when real seawater samples were employed as source water for solar distillation, the typical water-quality indices such as salinity , turbidity , anions, cations and organics of the condensed freshwater were below the limit values of the Standards for Drinking Water Quality in WHO, US EPA and China.
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PubMed
高影响因子
TALANTA
·
2021
·
IF 6.057
Tongtong Li,Yan Zhang,Xiaohong Sun,Yanjin Zhang,Yongan Wang,Zhiyong Nie
A fluorescent probe was developed for ratiometric detection of thallium ions in mineral water samples by modifying a G-rich aptamer (PS2.M − 7) with a fluorescence donor (Cyanine-3, Cy 3 ) and a quencher (Cyanine-5, Cy 5 ). The probe had a random coil structure that changed into a G-quadruplex structure upon binding with Tl + . This change in structure decreased the distance between the donor and acceptor moieties, which resulted in fluorescence resonance energy transfer between Cy 3 and Cy 5 . Under optimized conditions, the limit of detection and linear concentration range for Tl + were 30.1 μM (3σ) and 10 μM–10 mM ( R 2 = 0.9981), respectively. This simple and cost-effective fluorescence sensor provided satisfactory results for detection of thallium ions in spiked mineral water samples.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Chenxiao Yan,Qingqing Zhang,Heng Gao,Xiong Zheng,Tong Yang,Guoxiang Zheng,Xiaoshun Zhou,Yong Shao
DNA templated dye assemblies pave an easy way to regulate the optical properties of molecular aggregates. G-quadruplexes (G4s) provide versatile DNA platforms for the dye assemblies since their foldings can be easily tuned by cation ions and sequences. In this work, we found that the G4 handedness can be used to control the aggregate chirality of a dye of 3,3′-diethylthiacarbocyanine (DiSC 2 (3)). The left-handed and right-handed G4s can template the concurrent formation of the J- and H-aggregates of DiSC 2 (3) with emergence of the featured absorption spectra. However, the chiral J-aggregate of DiSC 2 (3) can be formed only on the left-handed G4s, while the chiral H-aggregate is otherwise grown only on the right-handed G4s, as confirmed by the induced circular dichroism (ICD) spectra with the characteristic splitting bands. Additionally, these G4s even at tens of nM level are efficient to produce these chiral aggregates, demonstrating the high sensitivity of G4s in creating these optically active dye assemblies. The possible growth sites of the aggregates are proposed by the sequence length-dependent assemblies. Our work will provide a new way to control the chiral assemblies of dye aggregates via the G4 handedness.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 2
·2061-2074
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IF 2.478
Wang Xule,Song Jimei,Lu Yun,Zhu Wanrong,Hu Gang
In this work, a series of Z-scheme Ag/Ag 2 WO 4 /g-C 3 N 4 (AAC) photocatalysts were successfully constructed by the deposition–precipitation method at room temperature. The phase, structure, morphology and optical property of the as-prepared photocatalysts were well characterized. Interestingly, all AAC exhibited prominent photocatalytic activity for Rhodamine B (RhB) degradation under visible light illumination. Especially, AAC-3 possessed the higher RhB degradation rate ( k = 0.1855 min −1 ). More remarkably, when H 2 O 2 (1 mL 0.0977 mol/L) was dissolved into reaction system, the degradation rate of RhB was further improved ( k = 0.7899 min −1 ), which could be mainly attributed to the high separation rate of photogenic carriers and more active species. Meanwhile, a feasible photocatalytic reaction mechanism was proposed and discussed in detail.
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RSC Advances
·
2020
·Vol. 11
·期 1
·78-86
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IF 3.119
Jingxuan Zheng,Bo Zhang,Zhao Wang
g-C3N4/MoS2 composites were successfully prepared by an electron-assisted strategy in one step. Dielectric barrier discharge (DBD) plasma as an electron source, which has low bulk temperature and high electron energy, can etch and modify the surface of g-C3N4/MoS2. The abundant N and S vacancies were introduced in the composites by plasma. The dual defects promoted the recombination and formation of heterojunctions of the g-C3N4/MoS2 composite. It exhibited stronger light harvesting ability and higher charge separation efficiency than that of pure g-C3N4 and MoS2. Compared with the sample by traditional calcination method, the plasma-sample showed better performance for degrading rhodamine B (RhB) and methyl orange. RhB is completely degraded within 2 hours on g-C3N4/MoS2 by plasma. A mechanism for the photocatalytic degradation of organic pollutants via the composites was proposed. An electron-assisted strategy provides a green and effective platform to achieve catalysts with improved performance.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2020
·
IF 4.872
ShuYao Xiong,XinHui Liu,XianJian Zhu,Gang Liang,ZhuoJun Jiang,BaoShan Cui,JunHong Bai
Photocatalysis has attracted wide attention due to its outstanding advantages in dealing with sewage. And compounds of metal oxides and g-C 3 N 4 that possess Z-type heterojunctions have become the star photocatalysts in degrading pollutants. In this paper, a novel one-step method for the preparation of highly efficient photocatalyst of Fe 2 O 3 /g-C 3 N 4 , using Fe (NO 3 ) 3 and urea as raw materials, is described. Under the optimized condition, the one-step synthesized photocatalyst of FeGCN-0.10 showed higher photocatalytic performance compared with the multi-step prepared photocatalyst, and the rate of removing basic fuchsin was 92% (210 min), which was 19.5% higher than that of the latter. Furthermore, different methods were also applied for characterizing Fe 2 O 3 /g-C 3 N 4. Structural characterization results confirmed the composites of Fe 2 O 3 /g-C 3 N 4 . Morphological characterization results showed that spindle-like Fe 2 O 3 particles were distributed more evenly on the layered g-C 3 N 4 compared with the impregnation method. Optical characterization results demonstrated the high intensity of the separated photo-generated electron-hole pairs and of Fe 2 O 3 /g-C 3 N 4 , which uncovered the removing mechanism of basic fuchsin.
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Catalysts
·
2020
·Vol. 10
·期 9
·1036
·
IF 3.52
Yining Zheng,Congcong Wang,Wenjing Fu,Qi An,Cundi Wei,Lina Li
For the first time, aluminum alloy was used as the main source to prepare aluminum oxide-modified carbon nitride with a melamine–cyanuric acid supramolecular complex. The introduction of amorphous aluminum oxide confers macroporosity to the skeletons of g-C3N4-AlOx. Its surface area increased to 75.5 m2g−1, about 1.5 times that of single g-C3N4. After modification, the visible light response range was expanded, especially at 450~500 nm, while the band structure could be adjusted. Compared with g-C3N4, g-C3N4-AlOxhas better photocatalytic performance, the adsorption rate for the dye rhodamine B (RhB) is about 2.1 times that of g-C3N4, and the RhB removal rate is 1.2 times that of g-C3N4.Keywords:g-C3N4;modification;aluminum alloy as aluminum source;photocatalysis;porosity introduction
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 2
·1082-1091
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IF 3.591
Yunqi Wang,Zhixiang Liu,Xu Tang,Pengwei Huo,Zhi Zhu,Boting Yang,Zhi Liu
In-depth research of the active sites and charge transport behavior is an important topic for investigating photocatalytic reduction of CO2. Herein, a novel photocatalyst composed of flake-like porous graphitic carbon nitride (P-CN) and CsPbBr3 is fabricated via a high temperature calcination and freeze drying method. The experimental results show that P-CN/CsPbBr3 has a superior CO2 reduction efficiency, and that the yield of CO reaches 30.39 μmol g−1, which is about 7.2 and 1.2 times higher than those of the primary B-CN (4.2 μmol g−1) and CsPbBr3 (24.4 μmol g−1), respectively. The improvement in photocatalytic performance is mainly ascribed to the heterostructure, which can promote the separation of photogenerated carriers, and the porous structure of P-CN, which can improve the absorption capacity of CO2. This study provides a significant method for the construction of efficient g-C3N4 based photocatalysts to reduce CO2.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ying Li,Shijun Zhu,Yao Xu,Riyue Ge,Jiangtao Qu,Mingyuan Zhu,Yang Liu,Julie M. Cairney,Rongkun Zheng,Sean Li,Jiujun Zhang,Wenxian Li
High–performance composite electrocatalysts of g–C 3 N 4 /FeS 2 /MoS 2 for hydrogen evolution reaction (HER) is synthesized by the growth of molybdenum disulfide (MoS 2 ) nanosheets from ferrous disulfide (FeS 2 ) sites supported on graphite–like carbon nitride (g–C 3 N 4 ) substrates. The high conductivity of such composite catalysts is induced by the Fe S bond between FeS 2 and MoS 2 and Fe N bond between FeS 2 and g–C 3 N 4 . These two bonds of Fe S and Fe N can have a bridging function to provide efficient charge transfer channels between g–C 3 N 4 and MoS 2 via chemical bonding rather than physical attachment. Furthermore, the FeS 2 sites can prevent the agglomeration of MoS 2 nanosheets and also seed the MoS 2 to form highly dispersed vertical growth nanosheets with more exposed edging active sites. As a result, this g–C 3 N 4 /FeS 2 /MoS 2 catalyst exhibits both high catalytic HER activity and stability.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Dandan Zhu,Qixing Zhou
In this work, nitrogen doped g-C 3 N 4 (NCN) with the extremely narrow band gap was prepared and applied for the photodegradation of phenols. Experiments and DFT (the density functional theory) computation identified that N-doping introduced in the g-C 3 N 4 matrix by substituting C atoms. DFT, PL (photoluminescence) spectra, optical property characteristic and PEC (photoelectrochemical) indicated that NCN possess extremely narrow band gap, efficient photogenerated carrier separation and the charge transfer, which enhanced the absorption of visible light and further promoted the photocatalytic activity. As a result, NCN(2:2) showed about twice higher photodegradation efficiencies and 3 times rate constant than pristine g-C 3 N 4 . The radical trapping experiments showed that •O 2 - radical and h + served as crucial active species during the whole photodegradation reaction. This work can provide a strategy to enhance the photocatalytic activity of photocatalysts via introduce foreign atoms in matrix.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 37
·19533-19543
·
IF 11.301
Wei Li,Qiong Ma,Xiao Wang,Xiao-shan Chu,Fei Wang,Xue-chuan Wang,Chuan-yi Wang
Utilizing solar light to produce hydrogen is an advanced strategy to alleviate the energy crisis. Graphitic carbon nitride (g-C3N4) and graphene oxide (GO) have demonstrated significant potential in synthesizing highly efficient photocatalysts due to their favorable charge separation and transfer. However, the simple 2D structure generally leads to a weak adhesion to the surface cocatalyst, which negatively affects the photoresponse, interfacial charge transfer and durability of the resultant photocatalyst. Herein, we designed a 3D macroporous g-C3N4/GO (p-CNG) skeleton to enhance the adhesion stability of the cocatalyst (anatase TiO2 NPs). The typical macroporous structure remarkably increased the BET surface area (65.81 m2 g−1) of the 3D p-CNG skeleton, which was 2.5-fold greater than that of the nonporous 3D CNG composite. The enhanced adhesion of the anatase TiO2 NPs on the 3D p-CNG skeleton promoted the formation of a heterointerface, leading to the fast interfacial charge transfer and improved photoresponse. Hence, the optimal 3D p-CNG/TiO2 (p-CNGT) catalyst represented excellent HER activity (33.1 μmol g−1 h−1) under the simulated solar light, which was 8.9-fold greater than that of the pristine anatase TiO2 NPs and 4.7-fold greater than that of the 3D p-CNG skeleton. Therefore, the high apparent quantum yield (12.4%) was achieved under illumination of λ = 400 nm. Due to the stable interfacial adhesion, the resultant catalyst represented excellent regenerability and durability during five cycles and 20 h of illumination. This work proposed an effective strategy for improving the HER activity and enhancing the durability of the existing catalyst.
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