NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 48
·23312-23320
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IF 3.925
Zegang Qiu,Zongxuan Li,Shaobo Ma,Zhiqin Li,Yueling Cao,Guangyu Li
The development of a highly effective non-noble metal catalyst for the synthesis of cyclohexanols with high selectivity is very important for the value-added utilization of lignin-derived phenolic compounds. In this paper, a promising Co/NPCN (nitrogen-doped porous carbon nanotubes) catalyst with Co nanoparticles (NPs) embedded in nitrogen-doped carbon for selective hydrogenating of phenol was prepared by introducing an appropriate amount of g-C3N4 (graphitic carbon nitride) into the preparation of ZIF-67 (Zeolite imidazolate framework). Characterization results reveal that the introduction of g-C3N4 of an appropriate amount reduces the size of Co NPs, improves the specific surface area and pore volume, and facilitates the formation of Co0. Full phenol conversion with 100% cyclohexanol selectivity could be achieved at 120 °C, 3 h and 2 MPa H2 over Co/NPCN. In addition, Co/NPCN presents great stability and scalability of the substrate in the phenol hydrogenation reaction. The DFT (density functional theory) calculations reveal that the parallel adsorption configuration of phenol is preferential, which favors the hydrogenation of phenol to cyclohexanol with high selectivity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Shuang Liang,Guozhe Sui,Dongxuan Guo,Ze Luo,Rongping Xu,Hong Yao,Jinlong Li,Chao Wang
The development of efficient heterojunctions with enhanced photocatalytic properties is considered a promising approach for photocatalytic hydrogen production. In this study, graphitic carbon nitride (g-C 3 N 4 )-wrapped nickel-doped zinc oxide/carbon (Ni-ZnO@C/g-C 3 N 4 ) core-double shell heterojunctions with unique core-double shell structures were employed as efficient photocatalysts through an innovative approach. Ni doping can enhance the intensity and range of visible light absorption in ZnO, and the carbon core coupled with the hollow double-shell structure can accelerate the charge transfer rate and improve the photon utilization efficiency. Meanwhile, the construction of the Z-scheme heterojunction extended the electron-hole pair transport path. In addition, the Z-scheme charge-transfer mechanism of Ni-ZnO@C/g-C 3 N 4 under simulated sunlight was verified by photoluminescence (PL) and electron spin resonance (ESR) experiments. As a result, the obtained photocatalyst acquired a high hydrogen evolution rate of 336.08 μmol g −1 h −1 , which is 36.49 times higher than that of pristine ZnO. Overall, this work may provide a pathway for the construction of highly efficient photocatalysts with unique core-double shell structures.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Bingke Xie,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jianmei Lu
Nitrogen oxide (NOx) removal has long been a subject that has motivated researchers to develop a diverse range of techniques, including physical adsorption, biofiltration, low temperature plasma, selective catalytic reduction, and photocatalytic oxidation. In this work, Cs 3 Bi 2 Br 9 lead-free perovskite was synthesized via in-situ growth on a 3D flower-like g-C 3 N 4 microsphere, which uses a series of Cs 3 Bi 2 Br 9 /g-C 3 N 4 (labeled as X% CBB/CN, where X = 5, 10, 20, 30, and 50) heterojunctions for the photocatalytic removal of NOx. The efficiency of NO removal was enhanced considerably, compared with that of the pristine elements, when irradiated with a 300 W Xe lamp with the concentration of NO at the ppb level. The results of photocurrent measurements and electrochemical impedance spectroscopy are consistent with the results of the NO removal test. Electron spin resonance results verified that ⋅OH and ⋅O 2 − are formed under visible light irradiation. We report the detailed mechanism for the photocatalytic process of NO removal by CBB/CN heterojunctions and provide insights into the potential applications of lead-free perovskite-based heterostructures in the field of photocatalysis.
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JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Yadong Liu,Yongjin Li,Jinge Hao,Taizhong Xiao,Liang Xu,Pengqi Shao,Zhaoyi Yin,Jianbei Qiu,Zhengwen Yang,Zhiguo Song
Graphitic carbon nitride (g-C 3 N 4 ) holds great promise for photocatalytic CO 2 reduction, but its performance is critically limited by strong excitonic effects that hinder charge separation and migration. Herein, a highly dispersed Ce-doped tubular g-C 3 N 4 framework was designed to induce a tailored amorphous phase transition, fundamentally modifying its electronic and structural properties. The amorphization creates a static exciton self-trapping network that reduces the exciton binding energy from 65 to 54.3 meV and generates a robust localized built-in electric field, driving spatial separation and directional charge migration along the one-dimensional tubular channels. Meanwhile, Ce 3+ /Ce 4+ redox couples act as a dynamic electron buffer, kinetically capturing and shuttling electrons. Consequently, the optimized 3%Ce-TCN achieves a CO production rate of 87.31 μmol/(g·h) under visible light, a 2.5-fold enhancement over pristine TCN, with an apparent quantum efficiency of 0.799% at 420 nm. In-situ Fourier transform infrared (FTIR) and density functional theory (DFT) calculations confirm that the Ce sites lower the energy barrier for key *COOH intermediate formation. This work establishes a new paradigm for manipulating exciton dynamics and carrier migration through rare earth-doping-induced microstructural engineering.
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LANGMUIR
·
2023
·
IF 3.9
Anran Li,Zhenyu Zhang,Chengqi Feng,Ting Zhang,Fei Liu,Haining Na,Jin Zhu
Graphite carbon nitride (g-C3N4) with a suitable structure and strong amine activity is designed and prepared to serve as a hydrogen bond donor for the microfibrilization of corncob cellulose to form a cellulose microfiber (CMF) bundle. Simultaneously, well-dispersed nanosized g-C3N4 is loaded into the bundle to form a photocatalyst for efficient photodegradation of rhodamine B (Rh B) in water. Under the optimal preparation conditions at 165 °C, 10 min, and 0.08 mol/L H2SO4, the yield of g-C3N4-functionalized cellulose microfibers (CMF-g-C3N4) reaches to the highest over 70%. The catalytic rate of CMF-g-C3N4 is 3.3 times larger than that of pure g-C3N4. The degradation rate of Rh B is maintained at over 90% in 10 cycles of photocatalytic degradation. The obtained CMF-g-C3N4 also has good thermal stability and mechanical properties. This research suggests a particularly simple way to transform cellulose into a highly efficient photocatalyst for water treatment.
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高影响因子
RSC Advances
·
2023
·Vol. 13
·期 45
·31820-31834
·
IF 3.9
Peiyao Xiong,Qian Li,Qijun Tang,Haiqiang Wang,Zhongbiao Wu
In this study, alkali-metal-doped crystalline g-C3N4 with an enriched cyano group was synthesized using the molten salt method and used for the visible-light photocatalytic degradation of methylamine (MA), a common organic amine compound with a low odor threshold. Different types and proportions of melting salts (Li, K, and Na) were added during secondary calcination to regulate the morphology, crystallinity, and surface defects of graphitic carbon nitride (g-C3N4). With molten salt treatment matched the melting point of the binary salt system, a cyano group and alkali metal co-doped crystalline g-C3N4 with a high surface area and good crystallinity were prepared. Co-decorating the alkali metal and cyano groups on crystalline g-C3N4 facilitated the adsorption of MA, realized an excellent photo-charge transfer efficiency, and generated more superoxide radicals. Compared with pristine g-C3N4 (PCN), the apparent rate constant of LiK15 : 5-CCN for the degradation of MA increased by 10.2 times and the degradation efficiency of 1000 ppm MA gas was 93.1% after 90 min of irradiation with visible light, whereas the degradation efficiency of PCN was 19.2%.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiayou Liu,Xiaoxiang Huang,Lizhen Hu,Penglei Liu,Liuhu Jia,Keiko Sasaki,Zhongchao Tan,Hesheng Yu
Simultaneous avoidance of secondary air pollution and catalyst deactivation remains a challenge for existing photocatalytic removal of nitric oxide (NO). Herein, a photocatalysis-adsorption (P-A) heterojunction is synthesized for eco-friendly NO removal by facilely grinding Pd single atoms (Pd 1 ) anchored g-C 3 N 4 (48CN/Pd) with UiO-66-NH 2 (UION). Under visible-light irradiation, the 40UION-CN/Pd composite shows 93.91 % of NO removal efficiency with only 2.73 % of NO 2 emissions and negligible catalyst deactivation. The DeNO x index increases remarkably from −0.66 for 48CN/Pd to 0.86 for 40UION-CN/Pd. Furthermore, the synthesized P-A heterojunction efficiently removes NO from real flue gases produced by a domestic coal-fired stove and from SO 2 -rich flue gases. The mechanism exploration based on experimental investigations and density functional theory (DFT) calculations reveals that UION captures the NO 2 selectively produced by 48CN/Pd, simultaneously suppressing NO 2 emissions and refreshing active sites for NO photooxidation. Moreover, the results of X-ray photoelectron spectroscopy (XPS), charge density difference calculation, energy-resolved distribution of electron traps (ERDT) and in-situ Kelvin probe force microscopy (KPFM) reveal that the built-in electric field and Type-II heterojunction formed between 48CN/Pd and UION promote the separation of photogenerated carriers, enhancing the catalytic activity of the composite. This work provides an innovative strategy to avoid NO 2 emission and catalyst deactivation during photocatalytic NO removal.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 48
·22050-22062
·
IF 3.3
Hui-Qin Zheng,Wen-Li Zhang,Min-Cai Yin,Yao-Ting Fan
In the present work, a ternary composite MoS2/soluble g-C3N4/CdS was synthesized using a facile one-pot hydrothermal reaction and conventional reflux reaction method. The composition, morphology, and properties of the ternary composite were characterized. The photocatalytic performance of the ternary composite was evaluated for hydrogen generation under LED lamp irradiation (450 nm < λ < 465 nm) with lactic acid (LA) used as a sacrificial reagent. The results demonstrated that the maximum hydrogen production reached 4869.6 μmol under the optimal hydrogen production conditions, including a composition of 20% soluble g-C3N4, 9% MoS2, a solution pH of 1, and an irradiation time of 6 hours. The corresponding hydrogen production rate for the ternary composite was calculated to be 8116 μmol g−1 h−1. Furthermore, a possible electron transfer mechanism of the ternary composite system was briefly explored. The interaction and synergistic effects between MoS2, soluble g-C3N4, and CdS in the ternary composite likely facilitate efficient electron transfer, resulting in enhanced photocatalytic activity for hydrogen production. Mechanistic research showed that the electron transfer pathway represented either a double or single type II heterojunction photocatalytic system.
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SOLID STATE SCIENCES
·
2023
·
IF 3.5
Qiqi Huang,Fuxiao Zhu,Feiyan Xiao,Gongliang Zhang,Hongman Hou,Jingran Bi,Shuang Yan,Hongshun Hao
In recent years, using external mechanical energy to solve environmental pollution problems has gradually become a promising strategy, such as piezoelectric catalysis and piezoelectric photocatalysis . In this paper, a series of HKUST-1/g-C 3 N 4 composite materials were successfully synthesized by the combination of g-C 3 N 4 with S-vacancy and porous HKUST-1 semiconductor. Under visible light irradiation and ultrasonic action, the catalytic activity of HKUST-1/g-C 3 N 4 on RhB degradation was investigated. When the mass ratio of HKUST-1 to g-C 3 N 4 is 1:0.3 during the process of piezoelectric photocatalysis, the as-prepared HKUST-1/g-C 3 N 4 composite had the best RhB degradation performance up to 94.42%, which is about 2.83 times that of visible light and 3.56 times that of ultrasonic waves. According to the result of the trapping experiment, the process of piezo-photocatalytic reaction could produce the number of reactive oxygen species (ROS), and the hydroxyl radical (•OH) was crucial in the breakdown of pollutants.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Hadeel A. Khayoon,Mohammed Ismael,Abbas Al-nayili,Hassan A. Alshamsi
LaFeO 3 -nitrogen deficient g-C 3 N 4 (LaFeO 3 -g-C 3 N 4 -H) heterostructure has been fabricated obtaining thermal polymerization of acetic acid-treated melamine followed by incorporation of perovskite-type LaFeO 3 onto the graphitic carbon nitride nanosheets (g-C 3 N 4 ) using La(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 ·9H 2 O as precursors. The as-synthesized nanocomposite was investigated using Fourier Transform Infrared Spectroscopy (FT-IR), powder X-ray diffraction (XRD), UV–Vis Diffuse Reflection Spectroscopy (UV–Vis DRS), Scanning Electron microscope (SEM), and Transmission Electron microscope (TEM). The findings of the characterization study revealed the successful incorporation of LaFeO 3 on g-C 3 N 4 -H nanosheets. The band gap energy of LaFeO 3 -g-C 3 N 4 -H heterojunctions was found to be active in the visible light region. The LaFeO 3 -g-C 3 N 4 -H ability to degrade Rhodamine B (RhB) dye in an aqueous solution was investigated under sunlight illumination. The results of photocatalytic degradation activity showed that LaFeO 3 -g-C 3 N 4 -H photocatalyst has presented the highest photocatalytic efficiency of 99.5% after 60 min under sunlight irradiation. The remarkable photocatalytic activity can be attributed to the defect structure of g-C 3 N 4 and the construction of heterojunction. In addition, LaFeO 3 -g-C 3 N 4 -H showed promise recyclability after 5 cycles with slight activity reduction.
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CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Zhenbang Xie,Qihang Liu,Haixin Zhao,Hongtai Chen,Guozhi Jia,E. Lei,Chao Wang,Yongzhu Zhou
The low charge separation and transfer of g-C 3 N 4 hinders its industrial application in photocatalytic hydrogen evolution. Here, we design a novel co-catalyst strategy to integrate Ag 2 Se nanoparticles in situ on the surface of g-C 3 N 4 . The optimized photocatalyst, 15% Ag 2 Se/g-C 3 N 4 , demonstrates remarkable photocatalytic efficiency in the hydrogen evolution rate, reaching to 1102.8 μmol·g −1 ·h −1 , 7 times higher than g-C 3 N 4 . To further elucidate the photocatalytic activity of 15% Ag 2 Se/g-C 3 N 4 , we present a possible mechanism based on various characterizations and density functional theory calculations. This research offers potential insights for the future development of silver chalcogenide composites in photocatalysis.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 40
·18659-18670
·
IF 3.3
Zhentao Wang,Waheed Iqbal,Jingjing Wang,Ninghui Chang,Chuanguang Qin
Degrading dye waste using inexpensive synthetic photocatalysts is intriguing since it provides the dual advantage of treating water and managing waste simultaneously. There is considerable interest in the construction of heterojunctions for their efficiency in using solar energy for the degradation of wastewater contaminants and enhancing the solar conversion efficiency. Herein, BiVO4 microspheres and 2D g-C3N4 nanosheets were used to synthesize a direct Z-scheme BiVO4/g-C3N4 heterojunction through a hydrothermal calcination approach. The distinct 0D/2D intimate contact heterostructure displayed a high interfacial area and broader visible-light absorption range together with high photoexcited charge pair mobility. Optimizing the content of the BiVO4 microspheres in the heterostructure led to the maximum efficiency for the visible-light photodegradation of rhodamine B (RhB), which was about 12.5 and 2.4 times higher than that for pure BiVO4 and g-C3N4, respectively. Moreover, the quenching effects of various scavengers demonstrated that ˙O2− and ˙OH radicals were the principal active species responsible for ameliorating the photocatalytic performance for RhB degradation. The demonstrated strategy for boosting the photocatalytic performance with Z-scheme systems may help the advancement of high-performance photocatalysts for sustainable and efficient pollutant degradation and energy applications.
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