APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Lina Kong,Xintong Zhang,Changhua Wang,Jianping Xu,Xiwen Du,Lan Li
Artificial direct Z-scheme system is promising in solar-fuel production owing to their efficient charge separation and high redox capability. However, direct Z-scheme system suffers from how to construct reasonable interfacial charge transfer channel for selective charge recombination. Here we fabricate a direct Z-scheme system consisting of g-C 3 N 4 crumpled sheet with Ti 3+ -doped TiO 2 nanoparticles via polycondensation of urea with TiO 2 followed by hydrogenated treatment. UV–vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) manifest that the hydrogenated treatment conferred Ti 3+ defect states below the conduction band minimum (CBM) of TiO 2 and improved visible light absorption of the g-C 3 N 4 /Ti 3+ -doped TiO 2 composite. The g-C 3 N 4 /Ti 3+ -doped TiO 2 exhibits remarkable photocatalytic performance for water splitting and degradation of pollutants than that of g-C 3 N 4 /TiO 2 , C 3 N 4 , and TiO 2 . The H 2 evolution rates of g-C 3 N 4 /Ti 3+ -doped TiO 2 reach up to 1938 and 287 μmol·h −1 ·g −1 under solar-light and visible-light irradiation, which is 3.4 and 2.8 times higher than that of g-C 3 N 4 /TiO 2 . The enhanced photocatalytic activity is ascribed to the Ti 3+ defects assistant formation of g-C 3 N 4 /Ti 3+ -doped TiO 2 Z-scheme photocatalyst, which results in efficient interfacial charge emigration and separation. Our work points out the critical role of defects in construction of Z-scheme pathways for charge transfer and provides possibilities for developing the other efficient photocatalysts.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 2
·339-349
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IF 5.693
Lin Chunling,Liu Boyang,Pu Liuyue,Sun Yan,Xue Yanli,Chang Mulan,Li Xin,Lu Xingyu,Chen Rong,Zhang Jiaoxia
As a highly active photocatalyst, g-C 3 N 4 /TiO 2 heterojunction nanocomposites were in situ synthesized by hydro-thermal method and calcination using melamine as precursors. The morphology and chemical structure of the prepared photocatalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), SEM, UV-vis, and photoluminescence analysis (PLA). At last, the photocatalytic activities of g-C 3 N 4 /TiO 2 nanocomposites to remove fluoride under simulated visible light were evaluated. Results showed that the fluoride removal rate of the prepared g-C 3 N 4 /TiO 2 was about three times than pure g-C 3 N 4 due to the rapid charge transfer and the efficient separation of photogenerated electron-hole pairs in heterojunctions between g-C 3 N 4 and TiO 2 . Graphical abstract Heterojunction g-C 3 N 4/ TiO 2 display the excellent fluoride removal rate due to the rapid charge transfer and efficient separation of electron-hole pairs.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Ruirui Hao,Guohong Wang,Hua Tang,Lingling Sun,Chang Xu,Deyan Han
Mesoporous photocatalytic materials with macroporous structures have attracted more and more attention because of their textural mesopores and intrinsic interconnected pore networks, which are able to efficiently transport guest species to framework binding sites. In this work, macro/mesoporous g-C 3 N 4 /TiO 2 heterojunction photocatalysts were fabricated without templates or additives by a facile calcination method using tetrabutyl titanate and melamine as the feedstocks. Photocatalytic experiments of the as-prepared samples were measured by the photocatalytic oxidation degradation of RhB solution at room temperature under visible light irradiation. The results indicated that the melamine content in the precursors had an important influence on photocatalytic activity of the as-prepared samples. At the optimal loading content, the apparent reaction rate constant ( k ) was 47.8 × 10 −3 min −1 for RhB degradation, exceeding that of pure TiO 2 (6.6 × 10 −3 min −1 ) and g-C 3 N 4 (15.2 × 10 −3 min −1 ) by factor of 7.2 and 3.1 respectively. The improved photocatalytic activity was attributed to high surface area and heterostructure formation of g-C 3 N 4 /TiO 2 composites. The trapping experiment results showed that O 2 − and h + were main active species in the decomposition of RhB. A possible enhanced photocatalytic mechanism of g-C 3 N 4 /TiO 2 heterojunction photocatalysts was proposed.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Catalysts
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2024
·Vol. 14
·期 6
·335
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IF 3.8
Peng Jiang,Yang Yu,Kun Wang,Wenrui Liu
Excessive emissions of carbon dioxide have led to the greenhouse effect and global warming. Reducing carbon dioxide into high-value-added chemicals through solar energy is a promising approach. Herein, a g-C3N4/TiO2heterojunction photocatalyst with efficient electron transfer is designed for photocatalytic CO2reduction. The CH4(18.32 µmol·h−1·g−1) and CO (25.35 µmol·h−1·g−1) evolution rates of g-C3N4/TiO2are higher than those of g-C3N4and TiO2. The enhanced photocatalytic CO2reduction performance is attributed to the efficient charge carrier transfer in the g-C3N4/TiO2heterojunction. The electron transfer route was verified by in situ irradiated X-ray photoelectron spectroscopy (XPS). The photocatalytic CO2reduction mechanism on g-C3N4/TiO2was investigated by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). This work provides a strategy for designing a polymer/metallic oxide heterojunction with efficient electron transfer for enhanced photocatalytic CO2reduction.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
CATALYSIS LETTERS
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2020
·Vol. 151
·期 7
·1961-1975
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IF 2.482
Wei Congcong,Zhang Wei,Wang Xinpeng,Li Aihong,Guo Jianping,Liu Bo
Abstract Here, g-C 3 N 4 /TiO 2 photocatalysts with mesoporous structure and intimate interfacial connection were synthesized via the facile pyrolysis of g-C 3 N 4 /MIL-125 composites. The photocatalytic H 2 evolution reaction was performed to examine the photocatalytic activity of obtained photocatalysts. Under the UV–vis light irradiation, the average H 2 evolution rate of g-C 3 N 4 /TiO 2 sample with optimal g-C 3 N 4 loading content (4.12wt%) was most increased by up to 0.606 mmol·g −1 ·h −1 , a value which transcended that of as-prepared g-C 3 N 4 (0.138 mmol·g −1 ·h −1 ) and mesoporous TiO 2 (0.244 mmol·g −1 ·h −1 ) by a factor of 4.41 and 2.48, respectively. The improvement in photocatalytic activity of g-C 3 N 4 /TiO 2 composites was explained by the synergistic effect between large specific surface area, decreased energy band gap and intimate interface contact. This study demonstrated a new approach for the preparation of binary mesoporous heterojunction photocatalysts. Graphical Abstract
研究领域:
材料科学
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光催化
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DOI
高影响因子
Carbon Letters
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2024
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IF 5.5
Liu Rui,Zhang Xin,Han Xue,Sun Yuan,Jin Shuang,Liu Ri-jia
Fe 3 O 4 /g-C 3 N 4 /TiO 2 catalyst has been fabricated using a simple ultrasonic method with high photocatalytic activity. The morphology, structure and optical properties of Fe 3 O 4 /g-C 3 N 4 /TiO 2 were systematically investigated by a variety of characterization techniques. The optimum degradation conditions were investigated by degrading tetracycline (TC) under visible light irradiation. The results showed that the degradation efficiency was the highest when the initial TC concentration was 5.0 mg/L, the pH value was 11 and the catalyst dosage was 1.0 g/L. After 100 min of visible light irradiation, the degradation efficiency of TC achieved at 73.61%, which was 1.64 and 1.19 times that of g-C 3 N 4 and Fe 3 O 4 /g-C 3 N 4 , respectively. Moreover, Fe 3 O 4 /g-C 3 N 4 /TiO 2 had good stability and recyclability. The results of capture experiments showed that ‧O 2 − and ‧OH were the main active species during the photocatalytic process, and a possible photocatalytic reaction mechanism of Fe 3 O 4 /g-C 3 N 4 /TiO 2 catalyst was proposed. This study provides a new way to improve the photocatalytic performance of g-C 3 N 4 , which has great potential in degrading pollutants such as antibiotics in wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Xin Jiang,Han Jiang,Yimin Tang,Rui Wang,Wenxue Wang,Libin Yang,Bing Zhao
Semiconductor heterojunction with functional integration can be used as an excellent matrix for the ultrasensitive detection of bisphenol A (BPA) with low molecular affinity. Here, a simple, low-cost and sensitive surface-enhanced Raman scattering (SERS) strategy using g-C 3 N 4 /TiO 2 heterojunction as substrate was presented for detection of BPA residues in foods. The g-C 3 N 4 /TiO 2 achieved specific chemisorption for target analyte by the formation of intermolecular H-bond between g-C 3 N 4 and BPA. And, a high-efficiency carrier separation in TiO 2 induced by heterostructure could be achieved for charge transfer between the substrate and molecule by a “donor-bridge-acceptor” charge-transfer mode. Due to the synergistic/collaborative contributions of two monomers in heterojunction, the SERS enhancement factor was as high as 3.77 × 10 7 . The detection limit of BPA residues in foods (milk, juice and drinking water) was as low as 10 −9 mol·L −1 , far below the EU standard. The developed substrate also exhibited excellent stability and anti-interference capability.
研究领域:
分析化学
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环境科学
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食品科学
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2023
·Vol. 98
·期 9
·2136-2145
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IF 3.4
Long Wang,Liu-Lin Zhao,Qin-Yuan He,Dan-Dan Shao,Shi-Peng Sun,Xue-Li Cao
BACKGROUND Desalination membranes have been widely in demand for separating dyes and salts. However, dyes are easily adsorbed on/in the membranes, deteriorating membrane performance. Coupling photocatalysis and membrane separation might be a promising strategy for efficiently alleviating membrane fouling. Aiming at the defects of single catalyst, this work constructed photocatalytic membranes based on heterostructured Fe 3 O 4 -doped g-C 3 N 4 (FeCN)/TiO 2 catalysts by successively filtrating FeCN aqueous dispersion and titanium butoxide/isopropanol solution on the hydrolyzed polyacrylonitrile substrate. RESULTS The H-bonds among TiO 2 , FeCN and substrate lead to excellent load stability of the photoresponsive layer. Due to the low-potential conduction band and high conductivity of Fe 3 O 4 and the low-potential conduction band of TiO 2 in FeCN/TiO 2 , electrons can be more easily transferred to guarantee the high separation efficiency of electrons and holes. Hence the membrane not only exhibited superior permeability (104 L m −2 h −1 bar −1 ) and dye desalting performance (Coomassie brilliant blue R250 rejection of >98.80% and NaCl rejection of <7.00%), but also displayed highly efficient and stable dye photodegradation. CONCLUSION The degradation efficiency surpassed that reported in the literature in comparable circumstances, and the recovery rate of permeability still reached 89.12% after three fouling–photodegradation cycles. This work provides new opportunities for designing high-efficiency self-cleaning membranes to solve membrane fouling based on low-cost materials. © 2023 Society of Chemical Industry (SCI).
研究领域:
材料科学
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环境工程
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DOI
高影响因子
OPTICAL MATERIALS
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2025
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IF 4.2
Lirong Chen,Mengyang Lv,Yanyu Wan,Yu Sun,Zhenchao Gu,Shuaishuai Zhang
g-C 3 N 4 /TiO 2 photocatalysts were in-situ synthesized via a straightforward high-temperature calcination method and used to activate persulfate (PS) to degrade indole under different light irradiation. The prepared g-C 3 N 4 /TiO 2 photocatalysts were characterized by SEM, TEM, XRD, BET, XPS, FTIR, and photocurrent response analysis. The CNT 1:5 (mass ratio of g-C 3 N 4 to TiO 2 of 1:5) and CNT 24:1 (mass ratio of g-C 3 N 4 to TiO 2 of 24:1) showed the best performance in degradation of indole solution under UV and visible light, respectively. Free radical quenching experiments and band structure analysis determined that the UV/CNT 1:5 and PS-Vis/CNT 24:1 systems followed an S-scheme and type-II transfer mechanism, respectively. A detailed analysis using GC-MS revealed the indole's intermediate products and proposed the indole's degradation pathway. Furthermore, using natural water matrices, the removal of other typical organic compounds, including quinoline, pyridine, and phenol, was investigated in the UV/CNT 1:5 and PS-Vis/CNT 24:1 systems. The results of this study promote the application of g-C 3 N 4 /TiO 2 composites as organic degradation catalysts, reflecting the potential of composite materials in the removal of toxic organic compounds in coal chemical wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Sheng-Zhe Zhao,Ran Lu,Yi Yang,Yun Lu,Raul D. Rodriguez,Jin-Ju Chen
Photocatalysis has a broad prospect for generating H 2 and reactive oxygen species . In this study, porous nanotubular g-C 3 N 4 /TiO 2 photocatalysts were obtained via electrospinning combined with an innovative vapor deposition approach. The waste foam was used as the precursor material for TiO 2 nanotubes , reducing production cost and benefiting resource recovery. The modification of g-C 3 N 4 onto TiO 2 nanotubes provided extensive active sites with an increased specific surface area and produced the heterojunction to improve charge separation. The g-C 3 N 4 /TiO 2 nanotubes displayed remarkable photocatalytic effects in the degradation of organic dye with a removal efficiency of 93.4% and H 2 evolution reaction performing at 4122 μmol·g −1 ·h −1 under simulated sunlight. Photocatalytic activation product analyses and density functional theory (DFT) calculations demonstrated a possible photogenerated carriers transfer pathway. This work provides a way to prepare multifunctional porous nanotubes using a facile synthesis method from abandoned resources with implications for environmental remediation and hydrogen generation.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2018
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IF 4.841
Dongyao Wu,Jinze Li,Jingru Guan,Chongyang Liu,Xiaoxu Zhao,Zhi Zhu,Changchang Ma,Pengwei Huo,Chunxiang Li,Yongsheng Yan
An Intercalated heterostructural g-C 3 N 4 /TiO 2 /HNTs supported photocatalyst was successfully prepared via sol–gel and calcination methods. The introduction of HNTs and the g-C 3 N 4 -TiO 2 heterojunction effectively enhanced the charge transfer and separation efficiency of photogenerated electron–hole pairs, which endued the g-C 3 N 4 /TiO 2 /HNTs hybrid material with an outstanding photoelectric performance and good stability. And an obviously enhanced photocatalytic activity was exhibited by photodegrading ciprofloxacin compared with pure TiO 2 . Furthermore, the main active species were detected through trapping experiment and ESR spin-trap technique with DMPO, which confirmed that the O 2 − and the h + were the main active species in the photocatalytic system.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
PLoS One
·
2020
·Vol. 15
·期 4
·e0231286
·
IF 2.74
Chao Zeng,Mei Deng,Hao Qiao,Boming Tang,Yongjie Ding,Xuejuan Cao
The application of photocatalyst in pavements has received comprehensive attention in recent years due to its ability to decontaminate nitrogen oxides (NOx). However, it’s remarkable that NOx also accumulated extensively in parking lots. The purpose of this study is to develop a movable photocatalytic plate (remarked photocatalytic KT plates) coupled with high activity to purify NOx. Firstly, the type of photocatalytic KT plates was determined according to NO removal experiment in laboratory. Then the plates were employed in the parking lots for removing NOx. One sample T-test, normality test and paired sample T-test methods for NOx concentration variation were conducted to determine the appropriate comparative means of dates under both dark and illuminated conditions. The difference of NO X concentration between dark and illuminated conditions was obtained to evaluate the photocatalytic removal efficiency. The results indicated that NO removal efficiency in laboratory and parking lots were 51.31% and 9.2%, respectively.
研究领域:
环境科学
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材料科学
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城市规划
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）