SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Qian Liu,Kangping Cui,Minshu Cui,Xueyan Liu,Qiang Zhang
Carbon substitution of nitrogen is considered as a non-toxic and stable way to improve the availability of π electrons in g-C 3 N 4 . In this paper, a simple one-step calcination method was adopted to prepare carbon and cyano co-doped g-C 3 N 4 (C-CND), photocatalytic experiments, characterization and excited state calculations showed that carbon substitution of bridging nitrogen greatly improved the π-conjugated system and synergistically modulated the electronic structure of g-C 3 N 4 with cyano, enhancing the photocatalytic activation towards peroxymonosulfate (PMS) by C-CND. Both radicals and non-radicals play an essential role in the C-CND/PMS/Vis system, where 1 O 2 dominates, and the activation mechanism is analyzed by combining the adsorption calculations between PMS and C-CND in different electrostatic potential regions. The results provide a valuable reference for the efficient photocatalytic activation of PMS by carbon self-doped g-C 3 N 4 .
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高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Lin Dong,Yunlan Xu,Dengjie Zhong,Haixing Chang,Jun Li,Yi Liu,Zhuofan Han
In order to develop efficient photoanode to improve the performance of visible light responsive photocatalytic fuel cell (PFC), in this work, polyaniline/g-C 3 N 4 /Bi 2 O 3 /Ti photoanode was successfully prepared using silica-sol drop coating method, and assembled with Cu cathode to construct PFC to decompose rhodamine B and generate electricity simultaneously. The degradation rate, maximum photocurrent density and maximum power density of this PFC were 91.23%, 0.086 mA cm −2 and 4.78 μW cm −2 , respectively, which were 1.4 and 1.8 times, 2.4 and 4.5 times, and 1.9 and 7.3 times those of the corresponding values of the PFCs with g-C 3 N 4 /Bi 2 O 3 /Ti and Bi 2 O 3 /Ti photoanodes, respectively. This is attributed to the type II heterojunction structure formed among polyaniline, g-C 3 N 4 and Bi 2 O 3 in the polyaniline/g-C 3 N 4 /Bi 2 O 3 /Ti photoanode. Among them, polyaniline has π-π conjugated structure, which can rapidly transfer the electronic charge between g-C 3 N 4 and Bi 2 O 3 , thus enhancing the separation efficiency of photo-generated e − -h + pairs spatially and reducing their recombination, extending the visible light response wavelength of the photocatalyst, and finally improving its photocatalytic properties. This study can provide significant reference for the research of Bi 2 O 3 -based visible light responsive PFC.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Mingrui Guo,Meng Chen,Jixiang Xu,Chao Wang,Lei Wang
Introducing defects and heteroatoms on carbon nitride (g-C 3 N 4 , CN) framework are effective ways to enhance its photocatalytic activity by regulating light absorption and charge carriers separation. Herein, a mechanochemical method was employed to synthesize Br-doped C, N-deficient CN (CN V -mCN-Br) via ball-milling of N-containing precursor and 6-Bromopyridine-3-carbaldehyde (BrPyCHO) followed by calcining. The ball-milling-evolved mechanical forces and BrPyCHO-derived HBr induced formation of C, N vacancies and C-Br bond in CN V -mCN-Br framework. The CN V -mCN-Br exhibited curled nanosheets morphology and separated electrons-holes distribution. The photocatalytic H 2 evolution rates of 1 %Pt-loaded CN V -mCN-Br in distilled water and simulated seawater were 22.21 and 34.41 mmol g –1 h −1 , respectively with 10% triethanolamine . The corresponding apparent quantum yields were 25.87% and 40.08% at 420 nm. This work provides a facile technique to simultaneously introduce defect and heteroatom in CN for high-efficiency photocatalytic H 2 evolution.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 19
·55044-55056
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IF 5.8
Bi Renke,Liu Jialong,Zhou Chutong,Shen Yijie,Liu Zhe,Wang Zhiyu
The construction of heterojunctions between semiconductors is a preferred route to improve overall photocatalytic activity. In this work, a facile and feasible method was innovatively developed to one-step prepare g-C 3 N 4 /TiO 2 heterojunctions via an absorption-calcination process using nitrogen and titanium precursors directly. This method can effectively avoid interfacial defects and establish a tight interfacial connection between g-C 3 N 4 and TiO 2 . The resultant g-C 3 N 4 /TiO 2 composites exhibited prominent photodegradation efficiency for tetracycline hydrochloride (TC-HCl) under visible light and simulated-sunlight irradiation. The optimal g-C 3 N 4 /TiO 2 composite (urea content of 4 g) showed the highest photocatalytic efficiency, which can degrade 90.1% TC-HCl under simulated-sunlight irradiation within 30 min, achieving 3.9 and 2 times increases compared to pure g-C 3 N 4 and TiO 2 , respectively. Besides, photodegradation pathways based on the role of active species ·O 2 − and ·OH were identified, indicating that a direct Z-scheme heterojunction was formed over the g-C 3 N 4 /TiO 2 photocatalyst. The enhanced photocatalytic performance can be attributed to the close-knit interface contact and the formation of Z-scheme heterojunction between g-C 3 N 4 and TiO 2 , which can accelerate the photo-induced charge carrier separation, broaden the spectra absorption range, and retain a higher redox potential. This one-step synthesis method may provide a new strategy for the construction of Z-scheme heterojunction photocatalysts consisting of g-C 3 N 4 and TiO 2 for environmental remediation and solar energy utilization.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2023
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IF 4.3
Qingyun He,Shanxi Gong,Qinghua Liang,Zhifeng Liu,Binbin Shao,Ting Wu,Yuan Pan,Xiansheng Zhang,Miao He,Lin Ge,Jingwen Sun
A novel Schottky heterojunction was obtained by co-calcining fish-scale tubular carbon nitride (FTCN), V-BiOIO 3 and Tungsten carbide (WC) for photocatalytic degradation of tetracycline hydrochloride (TCH). The novel Schottky heterojunction has been analyzed by several characterizations and experiments. The case of photocatalytic degradation was studied for different initial concentrations, electrolyte and pH, respectively. The experiments have indicated that the V-BiOIO 3 /g-C 3 N 4 /WC performed an excellent activity of photocatalytic for TCH degradation (89.0%). In the mechanism analysis, we first deduce that the V-BiO3/FTCN compound belongs to the S-scheme heterojunction photocatalysts based on the properties of the band gap structure, which can effectively suppress recombination of joint carriers. Secondly, the introduction of the cocatalyst WC formed Schottky junction, which could play a role as an electronic library to trap e − and promote the separation of photo-induced carrier and thus maximize the strong oxidation ability of h + . In addition, the introduction of WC could also significantly enhance the optical absorption properties of the composites. This research could provide a new idea for the construction of novel and efficient carbon nitride-based photocatalysts under VSL (visible light), and promote its practical application in environmental remediation.
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Catalysts
·
2023
·Vol. 13
·期 5
·868
·
IF 3.9
Jun-Cai Hao,Rui-Xin Zhang,Miao Ren,Jia-Xuan Zhao,Zhi-Hua Gao,Lei Liu,Zhu-Xia Zhang,Zhi-Jun Zuo
Copper-based zeolite catalysts are widely used in methanol synthesis from methane oxidation, but their photothermal catalytic properties have seldom been explored. This study examines the effect of the preparation method on Cu-based zeolite composite graphite-phase carbon nitride catalysts (Cu-MOR/g-C3N4) for direct methanol synthesis from methane oxidation by photothermal catalysis. Four different preparation methods are employed: liquid phase ion exchange (Cu-MOR/g-C3N4-IE), isovolumetric impregnation (Cu-MOR/g-C3N4-IM), solid-state ion exchange (Cu-MOR/g-C3N4-GR), and hydrothermal synthesis (Cu-MOR/g-C3N4-HT). Cu-MOR/g-C3N4-IE shows the highest methanol yield (3.09 μmol h−1gcat−1) due to strong interactions between the CuxOyspecies and g-C3N4, as well as smaller interfacial charge transfer forces. This study provides a new method for the design and synthesis of catalysts for the conversion of methane.Keywords:Cu-MOR/g-C3N4;methane;methanol;photothermal catalysis;preparation method
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Surfaces and Interfaces
·
2022
·
IF 6.137
Jin-Yu Wang,Zhong-Zhu Hu,Xin-Ting Sun,Ya-Qin Gao,Jun-Lin Wang,Jie Xu,Gan Jin
Photocatalytic cleavage of lignin C β -O-4 bonds is a very effective method to promote the high-value utilization of lignin because lignin can provide a large number of aromatics. However, the higher carrier recombination rate severely inhibits the efficiency of photocatalytic cleavage of C β -O-4 bonds in lignin model compound. Here, heterojunction photocatalysts CdS-C 3 N 4 were successfully synthesized through the photodeposition of different masses of CdS on the surface of C 3 N 4 . The obtained photocatalyst CdS-C 3 N 4 can effectively break the lignin C β -O-4 bonds in 2-Phenoxy-1-phenylethanol (lignin model compound) and the products formed are mainly phenol (Phol) and acetophenone (Ap). More importantly, the yields of Phol and Ap were up to 86.5% and 74.3%, after only irradiation for 1.5 h, respectively, under optimum conditions. A mechanistic study showed that photocatalytic reaction follows a photogenerated electron-hole coupled mechanism. The high photocatalytic performance of CdS-C 3 N 4 is mainly ascribed to the fast photogenerated electron-hole separation capability and good dispersion of CdS on C 3 N 4 . This work offers an idea for selective cleavage of lignin C β -O-4 bonds by constructing a heterojunction photocatalyst.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Xuelan Hou,Yicheng Zhao,Yongdan Li
Construction of Z -scheme graphitic carbon nitride-titanium dioxide nanotubes (C 3 N 4 -TNT) has been known useful to optimize the band structure for improving photon capture and for accelerating charge carrier separation and transfer rate in photoelectrochemical water splitting (PECWS) cells. However, the reported operating potential window in a PECWS cell, often in 0 – 1.23 V RHE (volt versus reversible hydrogen electrode) plus its overpotential, is too narrow to understand the C 3 N 4 -TNT electrode. Herein, a broad potential window of −0.5 − 2.5 V RHE is applied to C 3 N 4 -TNT@Ti and recorded via the polarization test under chopped sunlight to analyze the effect of both electrons from external electrical circuit and photons from simulated sunlight. In 0 – 2.5 V RHE , the potential enhances the photocurrent density. For example, at 1.6 V RHE , the C 3 N 4 -TNT sample exhibits 1.8-time higher photocurrent density than that of pure TNT. In −0.5 − 0 V RHE , i.e., both samples do not give photo-current response. In addition, for advanced water oxidation/reduction beyond WS to oxygen/hydrogen, a large potential window will be expected. Further, the light capture ability, the charge carrier recombination rate, and the electron flow path through the C 3 N 4 -TNT junction without and with reverse/forward potentials are discussed to elucidate the effect of the applied potential.
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高影响因子
Catalysts
·
2023
·Vol. 13
·期 2
·238
·
IF 3.9
Qing Jin,Youlin Xiang,Lu Gan
Indoor formaldehyde pollution causes a serious threat to human health since it is uninterruptedly released from wooden furniture. Herein, we prepared a g-C3N4-modified TiO2composite photocatalyst and coated it on the surface of a commercial artificial particle board with the assistance of melamine formaldehyde adhesive. The g-C3N4/ TiO2coating was then used to degrade formaldehyde which was released in real-time from the particle board under the irradiation of visible light. The results showed that compared with pure TiO2, the g-C3N4/ TiO2composite with a heterojunction structure had a lower band gap energy (~2.6 eV), which could effectively capture luminous energy from the visible light region. Under continuous irradiation, the g-C3N4/ TiO2photocatalytic coating was capable of degrading more than 50% of formaldehyde constantly released from the particle board. In the meantime, the photocatalytic coating also exhibited promising catalytic stability towards various formaldehyde release speeds, air flow velocities and environmental humidities. The hydroxyl radical and superoxide radical were found to be the predominant active species which triggered formaldehyde degradation. This study provides a feasible and practical approach for the improvement in indoor air quality through photocatalyst surface engineering.Keywords:photocatalyst;TiO2;g-C3N4;heterostructure;formaldehyde degradation
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xuecheng Liu,Linjie Yan,Xiting Hu,Hongli Feng,Bingke Guo,Xia Ha,Hui Xu
A facile construction of B and P doped carbon nitride as a potential photo-catalyst for splitting water to generate hydrogen or oxygen and BPA removal under visible light. B and P doping are confirmed by a series of characterizations. As the symmetrical π-conjugated rings of g-C 3 N 4 could be destroyed by B and P doping to enhance the visible-light absorbance and n → π∗ electronic transition to provide a new pathway for the directional separation of photoexcited electrons to boost the photocatalytic activity. Significantly, the CN-BP catalyst demonstrates excellent H 2 and O 2 evolution rates of 4.0 mmol H2 h −1 g −1 and 0.3 mmol O2 h −1 g −1 under visible light, which is about ∼3.8 and 21.6 times higher than that of g-C 3 N 4 , respectively. Notably, without sacrificial agent , the CN-BP could remove BPA completely by oxidation to generate 30 μmol h −1 g −1 H 2 . Both DFT calculations and characteristic results reveal that B and P doped carbon nitride reduce band gap energy , improve light harvesting and separation rate of electron-holes carriers for upgrading the photocatalytic activity.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Yajing Huang,Dingren Ma,Jing Cao,Zhuoyun Tang,Lingling Hu,Yexing Zhang,Huinan Zhao,Dehua Xia,Chun He,Po Keung Wong
A simple hydrothermal method was applied to synthesize a 2D/2D g-C 3 N 4 /Bi 2 WO 6 (CN/BWO) composite photocatalyst for the photocatalytic removal of gaseous methyl mercaptan (CH 3 SH). The layered structure of CN/BWO and the C-O-Bi bonds at the interlayer interface were confirmed by thorough characterization techniques. The C-O-Bi bonds were demonstrated to reduce interlayer charge transfer resistance and inhibit photogenerated electron/hole pairs recombination. Therefore, 0.1-CN/BWO exhibited the highest photocatalytic efficiency for CH 3 SH removal, which was 1.4 times higher than 0.1-CN/BWONF with nanoflower structure, and 5.1 and 1.9 times higher than that of pure g-C 3 N 4 and Bi 2 WO 6 . The photocatalytic oxidation pathway and mechanism for CH 3 SH removal were revealed based on reactive species trapping, electron spin resonance (ESR), and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) tests. This work provides new insights into the design of photocatalysts with high photocatalytic performance and stability for the removal of volatile organic compounds (VOCs).
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xudong Yin,Xiaojie Sun,Yufeng Mao,Ruzhen Wang,Dehao Li,Wenyu Xie,Zhenghui Liu,Zhisen Liu
The elimination of tetracycline hydrochloride (TC-HCl) from water has attracted extensive research attention. This study hydrothermally synthesized composite photocatalysts composed of BiVO 4 microspheres containing coexisting phases of monoclinic scheelite (M-BiVO 4 ) and tetragonal zircon (T-BiVO 4 ), i.e., MT-BiVO 4 , loaded onto P-doped g-C 3 N 4 nanosheets (PCNS). Furthermore, their morphology, structure, and photoelectrochemical properties were comprehensively characterized, and the performance and stability of photocatalytic degradation of TC-HCl were examined. Additionally, the effects of humic acid (HA), coexisting anions/cations, and actual water samples on the degradation efficiency of TC-HCl were investigated, and the degradation mechanism and pathways were examined. The findings indicated that the percentage of M-BiVO 4 in MT-BiVO 4 considerably influences the photocatalytic activity of the composite catalyst. Furthermore, the excellent photocatalytic performance of 5% BVO/PCNS was attributed to the synergistic effects of P-doping the modified g-C 3 N 4 , MT-BiVO 4 isotype heterojunction effects, and the Z-scheme heterojunction constructed from MT-BiVO 4 and PCNS, which can enhance the absorption range of the visible light and accelerate the transfer and separation of charge carriers between catalysts. The free radical capture experiments and electron spin resonance tests indicated that holes and O 2 - were the dominant active species in the photocatalytic degradation process. With high reusability and stability, the 5% BVO/PCNS composite has great potential for practical wastewater treatment applications. This study offers a new approach for preparing photocatalysts synergized by isotype and Z-scheme heterojunctions.
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