Journal of Inorganic and Organometallic Polymers and Materials
·
2021
·Vol. 32
·期 3
·973-983
·
IF 3.543
Yu Mingwei,Zhang Lianhong,Wen Jie,Zhang Hui,Liu Faping,Lv Yanjun,Zhao Xiaodong
The remove of the organic pollutants in water plays an important role on the environmental protection, thus photocatalysis, as an effective method, has been attained much attention to deal with this problem. In this paper, a composite of g-C 3 N 4 and Mg–Al hydrotalcite derived metal oxides was prepared by simple co-precipitation methods followed by calcination. The effective adsorption-photocatalysis synergic effect and highly efficient removal of organic pollutants from water under simulated sunlight irradiation was found in the presence of fabricated metal oxide nanocomposites. The photocatalytic degradation rate of methylene blue reached 97.3% within 1 h under visible light, and the degradation rate constant was 0.0432 min −1 , which is 3.6 times that of g-C 3 N 4 . Though characterization analysis, more active sites are exposed to absorb more organic pollutants on the mater surface in the presence of the open hierarchical structures of composite materials, and the "face to face" contact structure between 2D materials is formed to promote the separation of electrons and holes. The photocatalytic degradation was stable in the recycling process of the catalyst. In addition, the photocatalytic degradation mechanism of the catalyst was explained by free radical scavenging experiment. The material provides an effective method for removing organic pollutants in water, and has broad application prospects.
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Catalysts
·
2022
·Vol. 12
·期 12
·1496
·
IF 4.501
Fengyun Su,Zhishuai Wang,Haiquan Xie,Yezhen Zhang,Chenghua Ding,Liqun Ye
Hydrogen evolution by photocatalytic technology has been one of the most promising and attractive solutions, and can harvest and convert the abundant solar energy into green, renewable hydrogen energy. As a new kind of photocatalytic material, graphitic carbon nitride (g-C3N4) has drawn much attention in photocataluytic H2production due to its visible light response, ease of preparation and good stability. For a higher photocatalyic performance, N defects were introduced in to the traditional g-C3N4in this work. The existence of N defects was proved by adequate material characterization. Significantly, a new absorption region at around 500 nm of N-deficient g-C3N4appeared, revealing the exciting n-π* transition of lone pair electrons. The photocatalytic H2production performance of N-deficient g-C3N4was increased by 5.8 times. The enhanced photocatalytic performance of N-deficient g-C3N4was attributed to the enhanced visible light absorption, as well as the promoted separation of photo-generated carries and increased specific surface area.Keywords:N defects;g-C3N4;H2evolution;photocatalysis;n-π* transition
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 329
·期 2
·1125-1133
·
IF 1.371
Wu Fan,Zhang Zhibin,Cheng Zhongping,Zhou Runze,Lin Yuling,Liu Yuhui,Wang Youqun,Cao Xiaohong,Liu Mingguang,Liu Yunhai
The photocatalytic reduction of soluble \({\text{UO}}_{2}^{2 + }\) from radioactive wastewater is becoming an effective method to reduce radioactive pollution, while available catalysts are considerable limitation. Herein, the ZnS@g-C 3 N 4 (ZSGCN) heterojunctions complexes were compounded as catalysts to reduce \({\text{UO}}_{2}^{2 + }\) . The results from TEM, XRD, XPS, EIS, DRS and PL showed that the ZnS nanoparticles combined with graphite carbon nitride (GCN), which is the construction of heterojunctions broadened the absorption range of sunlight. The ZSGCN-5 presented the optimal photocatalytic reduction activity to \({\text{UO}}_{2}^{2 + }\) , which was 4.34 times than that of pristine GCN. The ZSGCN-5 heterojunction becomes a promising photocatalyst for radioactive environment remediation.
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CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Aerzigu Xukeer,Jin Li
The ternary nanocomposite ZnO/MnO2/g-C3N4 was synthesized for room-temperature ammonia gas detection. Incorporation of g-C3N4 into the ZnO/MnO2 heterostructure significantly improved the composite’s sensing sensitivity at ambient conditions. g-C3N4 facilitated electron migration across the heterojunction interface, boosting conductivity, and provided abundant adsorption sites for ammonia molecules due to its layered structure. The ZnO/MnO2/g-C3N4 composite material exhibits outstanding ammonia sensing performance, with its detection sensitivity being 2.4 times that of the ZnO/MnO2 system. Notably, this material demonstrates rapid response and recovery characteristics, with recorded times of 7.3 and 1.6 s, respectively, thereby optimizing its functional performance and expanding its range of operational applications. The study found that the optimal doping ratio of ZnO/MnO2/g-C3N4 can effectively enhance the material’s specific surface area and electron mobility, thus improving its ammonia adsorption capacity and optimizing the sensor’s response and recovery characteristics. The synthesis employed a sequential two-step strategy: initial formation of a ZnO/MnO2 heterostructure followed by g-C3N4 integration. This approach effectively mitigated limitations of pure ZnO, including sluggish desorption kinetics and low response magnitude. Density functional theory (DFT) computations were employed to elucidate the atomic-level sensing mechanism, revealing significant charge redistribution at the ZnO/MnO2/g-C3N4 heterojunction interfaces upon ammonia adsorption.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Jianmei Pan,Wei Shen,Yahai Zhang,Hua Tang,Haoyu Sun,Wenqiang Zhong,Xuehua Yan
Photocatalytic water splitting to product hydrogen (H 2 ) is a desired route to utilize solar energy into chemical energy. At present, most photocatalysts for H 2 generation contains metallic elements with high-cost, confined reserves, and environmentally unfriendly. The exploitation of metal-free and efficient photocatalysts becomes particularly important. Herein, a new metal-free g-C 3 N 4 -based heterojunction composites were facilely produced via the ultrasonic assisted deposition and subsequent calcination from g-C 3 N 4 layers embedded with SiOC with prominent conductivity and large surface area. Systematic investigates suggested that the SiOC/g-C 3 N 4 heterojunctions exhibited eminently meliorated photocatalytic H 2 production efficiency. The optimum H 2 production rate (1020 μmol h −1 g −1 ) of the SiOC/g-C 3 N 4 photocatalyst is 3.2 and 25.5 folds that of g-C 3 N 4 and SiOC , respectively. The boosted photocatalytic activity primarily originates from the increased absorptivity of light, the markedly expedited charge migration and the impeded recombination of charge carriers. This study offers a new perspective for the scientific contrive and fabrication of high-quality heterojunction photocatalysts for solar energy utilization.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zijie Zhang,Qiao Yin,Linlin Xu,Jiaming Zhai,Chun Guo,Yongqiang Niu,Liwei Zhang,Mingliang Li,Hailong Wang,Li Guan,Rui Zhang,Hongxia Lu
The construction of new semiconductor photocatalysts toward the enhancement of photocatalytic activity under visible-light is crucial for a sustainable and clean future. In this paper, cation doping and heterojunction construction were synergistically used to synthesize g-C 3 N 4 matrix composite with a narrow band gap and low recombination rate of photogenerated electron-hole pairs. Potassium-doped-C 3 N 4 (KCN) was used as the matrix to construct semiconductor heterojunction with Cd 0.5 Zn 0.5 S (CZS) by hydrothermal method . The resulting composites were characterized through X-ray diffraction, infrared radiation, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, and ultraviolet–visible diffuse reflectance spectroscopy techniques to examine its phase structure, morphological, valance state and optical properties respectively. The photocatalytic performance of the samples evaluated by H 2 evolution and degrading the Rhodamine B (RhB) aqueous solution. After 12 h hydrothermal reaction at 140 °C, CZS particles uniformly distributed on the KCN matrix. The photocatalytic hydrogen production rate (HPR) of the sample loaded 24 wt% CZS (KCN/CZS 24 wt%) reaches 1.83 mmol/g·h which is 5.6 times of pristine g-C 3 N 4 . The degradation rate constant on RhB of KCN/CZS 24 wt% is ( k = 0.041 min −1 ) 7.9 times higher than g-C 3 N 4 . The enhanced photocatalytic activity can be attributed to the well-matched energy level of KCN and CZS as well as the extended light absorption of the composites.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
·
IF 6.155
Miao-Miao Fang,Jun-Xia Shao,Xiang-Gang Huang,Jin-Yi Wang,Wei Chen
A direct Z-scheme CdFe 2 O 4 /g-C 3 N 4 hybrid systems with different weight ratios of CdFe 2 O 4 nanoparticles were successfully designed and constructed for ceftiofur sodium photodegradation. The as-obtained CdFe 2 O 4 /g-C 3 N 4 hybrid samples composed of CdFe 2 O 4 nanoparticles and g-C 3 N 4 nanosheets were systematically characterized by different techniques including X-ray diffraction, scanning electron microscope, transmission electron microscope, Fourier transform infrared spectroscopy , X-ray photoelectron spectroscopy, UV–vis DRS , chemical oxygen demand, inductively coupled plasma mass spectrometer, photochemical test and electron spin resonance spectrometer technique. The optimal photocatalytic activity for ceftiofur sodium photodegradation was achieved by modulating the weight ration between CdFe 2 O 4 nanoparticles and g-C 3 N 4 nanosheets. The result from photocatalytic tests indicate that CdFe 2 O 4 /g-C 3 N 4 -2 hybrid sample exhibit highly efficient photocatalytic activity towards ceftiofur sodium removal in comparison with pristine CdFe 2 O 4 nanoparticles and pure g-C 3 N 4 nanosheets. Meanwhile the excellent photocatalytic stability of CdFe 2 O 4 /g-C 3 N 4 -2 hybrid sample was also verified during recycling runs towards photocatalytic ceftiofur sodium degradation. The significant enhancement of photocatalytic activity was attributed to the Z-scheme charge separation and transfer based on the construction of tight heterogeneous interface and well-matched band potentials. We expect this research to provide a new insight into the design and preparation of direct Z-scheme hybrid photocatalysts for environmental remediation.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 37
·15908-15918
·
IF 3.288
Xiuna Yu,Zhixiang Liu,Yemei Wang,Hongyu Luo,Xu Tang
Insights into active sites and charge transport behavior are challenging topics for fabricating composite photocatalysts and investigating their photocatalytic degradation reaction mechanisms. Herein, novel composites comprising biomass charcoal and graphitic carbon nitride (CN) were fabricated via facial alkali catalysis and thermal condensation of corncob and melamine precursors. By fine-tuning the calcination temperature, the carbonization temperature of corncob-derived biomass charcoal was controlled, which had a great influence on the optimal photocatalytic activity of C–CN-600, which was 90% of the degradation activity of 2-mercaptobenzothiazole (MBT), and about 2-fold higher than that of pure CN. The corncob not only acts as a precursor for biomass charcoal, but can also prevent the agglomeration of CN at high temperature. Moreover, the charge carrier lifetime, visible light absorption and surface area are also revealed in detail by systematic characterization. In addition, the intermediate products of MBT, the degradation reaction pathway, and the mechanism over C–CN are revealed in depth.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Enzhou Liu,Chenyang Jin,Chenhui Xu,Jun Fan,Xiaoyun Hu
Transition metal phosphides are considered as the most prospective replacements for noble metal cocatalysts used for H 2 evolution during photocatalytic water splitting. In this work, Ni 2 P/g-C 3 N 4 composite photocatalyst was synthesized using a simple in-situ hydrothermal method by one step. Benefiting from the excellent light trapping, efficient transfer of charge carriers and strong stability of Ni 2 P nanoparticles , as well as the stable interface contact between Ni 2 P and g-C 3 N 4 , the Ni 2 P/g-C 3 N 4 exhibit greatly enhanced H 2 evolution performance during photocatalytic water splitting . The optimized H 2 evolution rate can reach 3344 μmol h −1 g −1 over 17.5 wt% Ni 2 P/g-C 3 N 4 , which is 68.2 times greater than that of pure g-C 3 N 4 and even much greater than that of 15 wt% Pt/g-C 3 N 4 . The apparent quantum efficiency (QE) is about 9.1% under 420 nm monochromatic. The enhancement mechanism was demonstrated in detail by transient photocurrent responses, photoluminescence spectra and electrochemical impedance spectroscopy . This work develops a facile strategy to fabricate transition metal phosphide/semiconductor heterojunction systems with potential application for photocatalytic H 2 evolution.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jiayi Chen,Xinyan Xiao,Yi Wang,Zhihao Ye
Novel hierarchical sheet-on-sheet WO 3 /g-C 3 N 4 (WOCN) composites were successfully fabricated by simple calcination method using acid-treated SrWO 4 /g-C 3 N 4 as precursors. The morphological observation showed that WO 3 nanosheets were closely anchored on the surface of g-C 3 N 4 nanosheets to construct a hierarchical nanostructure . The as-synthesized WOCN composites exhibited a significantly higher photocatalytic activity towards the photocatalytic degradation of rhodamine B (RhB) compared to pristine g-C 3 N 4 and WO 3 under simulated sunlight irradiation. The optimum photocatalytic activity of the WOCN at a WO 3 mass content of 34.6% was 6.5 and 3.0 times higher than that of pristine WO 3 and g-C 3 N 4 , respectively. The enhanced photocatalytic activities of WOCN composites were attributed to the formation of hierarchical heterostructure , which provided larger specific surface area, better visible-light absorption capability, reduced the recombination of photogenerated electron-hole pairs and enhanced separation efficiency of charge carriers. A Z-scheme photocatalytic mechanism was proposed according to active species trapping experiments.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Huanhuan Zheng,Hengchang He,Min Lu,Yuhui Pei,Huapei Peng,Wanli Zhou,Cheng Guo,Jianqiang Wang
Novel composite material (g-C 3 N 4 @Ser-PMO) based on the combination of serine mesoporous organosilicon (Ser-PMO) and graphitic carbon nitride (g-C 3 N 4 ) was designed to purify water containing antibiotic under light illumination. Serine mesoporous organosilicon was first formed by using self-created organosilicon precursor with serine as organic silicon resource in the presence of g-C 3 N 4 under template via co-condensation method. The structural, morphological and optical properties of composite material were confirmed by series of characterizations including XRD, FTIR, N 2 adsorption-desorption, UV–vis DRS spectra, TEM and XPS spectra. These results displayed that ordered mesoporous channels were formed on the surface of graphitic carbon nitride to enhance optical properties. Meanwhile, Serine was first induced in mesoporous framework to provide active sites. During photo-degradation experiment of ofloxacin in water, composite material exhibited excellent degradation efficiency. 99 % of ofloxacin was nearly degraded under the light irradiation in 90 min, compared with pristine g-C 3 N 4 . Moreover, composite material showed good stability and recyclability after multiple cycle experiments, which provided an ideal way to alleviate the pollution problem from antibiotics in water.
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Catalysts
·
2025
·Vol. 15
·期 9
·892
·
IF 4
Zhen Li,Kwang Leong Choy
Electrocatalytic CO2reduction driven by renewable electricity offers a sustainable approach to producing valuable chemicals, though it is often hindered by low activity and selectivity. CuO, an important transition metal oxide, exhibits unique advantages in photoelectrocatalysis due to its high intrinsic catalytic activity and ability to serve as an active site for CO2reduction. SiO2, a widely used substrate, facilitates Cu loading and increases the specific surface area of the catalyst. Meanwhile, g-C3N4provides excellent visible-light responsiveness and efficient charge carrier mobility. Together, CuO, SiO2, and g-C3N4are earth-abundant, low-cost, and chemically stable, making them ideal for solar-to-fuel applications. Here, a novel ternary heterojunction photocatalyst was constructed using SiO2, CuO, and g-C3N4. The heterostructure significantly improves light-harvesting efficiency, promotes efficient charge separation and transport, and simultaneously mitigates photogenerated carrier recombination and catalyst corrosion. The resulting SiO2@CuO/g-C3N4catalyst demonstrates outstanding CO2conversion performance, achieving a CO yield of 17 mmolg−1h−1at 1.2 VRHEwith nearly 100% selectivity. Moreover, this work systematically investigates the electrocatalytic CO2reduction reaction (CO2RR) mechanism on Cu-based catalysts, offering insights into the formation of high-value multicarbon products and highlighting the potential of rational heterojunction design in enhancing solar-driven fuel production efficiency.
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