CHEMISTRY-A EUROPEAN JOURNAL
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2018
·Vol. 24
·期 59
·15930-15936
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IF 5.16
Xue-Li Zhai,Jiang Liu,Ling-Yun Hu,Jian-Chun Bao,Ya-Qian Lan
Graphical Synergy in action . A novel polyoxometalate-decorated g-C 3 N 4 -wrapping snowflake-like CdS nanocrystal photocatalyst, by virtue of the synergistic effect stemming from the integration of the individual advantages of CdS, g-C 3 N 4 , polypyrrole, and the polyoxometalate Ni 4 (PW 9 ) 2 , displays high-performance hydrogen production activity and superior photocatalytic stability (see figure). Photocatalytic hydrogen evolution technology is recognized as a promising approach to relieving the growing energy crisis. Therefore, the development of a stable high-performance photocatalyst has long been the focus of research. In this work, quaternary composite materials involving a snowflake-like CdS nanocrystal wrapped by different amounts of polyoxometalate-decorated g-C 3 N 4 and polypyrrole (GPP@CdS) have been synthesized as photocatalysts for hydrogen production under visible-light irradiation. It has been revealed that the best composite (40 % GPP@CdS composite) exhibits hydrogen production activity of 1321 μmol, which exceeds that of CdS by a factor of more than two, and can be used in at least seven cycles with negligible loss of activity. The enhanced photocatalytic performance has been primarily attributed to the efficient synergy of CdS, g-C 3 N 4 , polypyrrole (PPy), and the polyoxometalate Ni 4 (PW 9 ) 2 . It should be noted that the introduction of PPy and g-C 3 N 4 into the title composite simultaneously promotes electron/hole pair separation and photocatalytic stability, whereas Ni 4 (PW 9 ) 2 serves as an efficient electron modulator and extra catalytic active site.
研究领域:
材料科学
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能源化学
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DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 12
·3270-3278
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IF 5.726
Dan Liu,Chengwei Qiu,Minbo Li,Yanyu Xie,Lu Chen,Huaxiang Lin,Jinlin Long,Zizhong Zhang,Xuxu Wang
Kornblum oxidation (benzyl bromide to benzaldehyde) can be realized efficiently by NaOH-modified graphitic carbon nitride (g-C3N4). Different from the oxidation reaction carried out at high temperature using DMSO as an oxidant, our reaction is eco-friendly because it is carried out at room temperature under LED light irradiation using molecular oxygen as an oxidant, which avoids the problems of toxicity, pollution and purification. Alkali treatment leads to the surface deprotonation of g-C3N4 to form NaOH-modified g-C3N4 (Na/g-C3N4). The modifications of the electronic structure and surface chemical environment of g-C3N4 facilitate light absorption and formation of ˙O2− and therefore make the conversion of benzyl bromide reach up to 99%. This work demonstrates a green and sustainable route for benzaldehyde production and the superiority of g-C3N4 for organic syntheses.
研究领域:
有机化学
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环境科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 43
·55836-55849
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IF 0
Kang Lu,Wang Ying,Du Ruihan,Zhang Jinpu,Kang Chunli
In this paper, a modification of g-C 3 N 4 was carried out by combining non-metal doping with the construction of heterojunctions, and a type II heterojunction composite, S/g-C 3 N 4 @β-Bi 2 O 3 , was prepared. The phase structure, morphology, elemental composition, valence band structure, and light absorption performance of the photocatalyst were analyzed using characterization techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflectance spectroscopy (UV–vis DRS). The performance of the composite photocatalyst in the photocatalytic degradation of gaseous toluene, one of the typical volatile organic compounds (VOCs), under simulated solar light was studied. The effects of preparation conditions, toluene concentration, and recycling on the photocatalytic performance of the composite photocatalyst were investigated. The results show that under the optimal preparation conditions, S/g-C 3 N 4 @β-Bi 2 O 3 achieved a degradation efficiency of 74.0% for 5 ppm toluene after 5 h of light irradiation. Although the degradation efficiency decreased to 61.2% after five cycles, it maintained 83% of its initial activity, indicating good stability of the composite photocatalyst. Free radical quenching experiments demonstrated that h + was the main active species in the photocatalytic degradation of toluene, followed by ·O 2 − . Based on all experimental results, the migration law of photo-generated charges was analyzed, and a possible photocatalytic mechanism was proposed. In this study, a new material was obtained for the photocatalytic removal of VOCs by improving the photocatalytic properties of g-C 3 N 4 .
研究领域:
材料科学
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环境科学
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光催化技术
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DOI
PubMed
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Shangyuan Yu,Fengjue Wang,Meng Chen
The influence of morphology on the photocatalytic performance of catalysts is a critical aspect that merits further exploration. This study successfully synthesized a series of CdIn 2 S 4 /self-assembled g-C 3 N 4 photocatalysts with varying morphologies and structures via an in-situ deposition approach. The unique combination of g-C 3 N 4 ′s surface curvature and the radial-spreading layers significantly contributed to the superior photocatalytic activity observed in the optimal sample. This sample achieved an impressive 91.3 % degradation of methyl orange within 30 min and an 81.6 % degradation of tetracycline hydrochloride in 120 min. These degradation rates surpassed those of pristine g-C 3 N 4 by factors of 13.12 and 1.14, respectively. The findings of this research offer a promising strategy for designing highly active heterojunction photocatalysts tailored for pollutant removal and guiding the uniform deposition of CdIn 2 S 4 .
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
DIAMOND AND RELATED MATERIALS
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2021
·
IF 3.315
Shen Shen,Jia Jia Fu,Hong Bo Wang
Exploring desirable and photostable homostructured catalysts is an explosive scientific hotspot for energy crisis and wastewater treatment . Efficient pollutants removal from wastewater is an attractive route to sustainable development. We here present an ideal photocatalyst that incorporates both g-C 3 N 4 and TiO 2 sheets (TNs), creating a novel nanomaterial of the type g-C 3 N 4 /TNs catalyst. The obtained photocatalyst can accelerate the interfacial charge transfer rate. Subsequently, we prepared 2:1O − -g-C 3 N 4 /TNs photocatalysts by H 2 treatment, which not only generated more active defects on 2:1O − -g-C 3 N 4 /TNs surface, but also produced oxygen vacancies . As measured by the degradation of CR (CR), the as-prepared g-C 3 N 4 /TNs samples perform outstanding removal properties due to high photocurrent response under visible light irradiation, which are transcend than bulk g-C 3 N 4 or pure TNs separately. Specially, the obtained 2:1O − -g-C 3 N 4 /TNs catalysts exhibit the highest photocatalytic rate for decomposition of CR (86.7%, 2 h), which was 107.5, 7.167, and 1.43 times higher than that of TNs, g-C 3 N 4 , and 2:1 g-C 3 N 4 /TNs. The decisive factor in enhancing the photocatalytic ability of this optimal sample is the richly available reaction sites exposed by hydrogenation process .
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
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Liquan Jing,Yuanguo Xu,Zhigang Chen,Minqiang He,Meng Xie,Jie Liu,Hui Xu,Shuquan Huang,Huaming Li
Highly efficient different morphologies of SnS2 (nanoparticles, nanosheets, and 3D flower-like)/g-C3N4 composites were, respectively, prepared via an elementary hydrothermal method that was integrated with the calcination means. The XRD results showed that the relative intensities of several diffraction peaks, especially (001), (100), (101), and (102), indicated that the as-prepared samples (SnS2 nanoparticle, SnS2 nanosheet, and 3D flower-like SnS2) should be dominated by different specific preferred growth of facets. In comparison with SnS2 and pure g-C3N4, the SnS2/g-C3N4 composites exhibited much higher H2 development performance under visible light irradiation in the presence of Na2SO3 and Na2S as the sacrificial agent. The SnS2 nanoparticles/g-C3N4 composites exhibit the highest visible-light-driven H2-generation rate of 6305.18 μmol h–1 g–1 without any noble metal as cocatalyst, which is approximately 16.98 times higher than that of SnS2 nanoparticles. In all, the SnS2 nanoparticles (SnS2 nanoparticle/g-C3N4 composite) dominated by (001) and (100) preferred growth of facets exhibit significant photocatalytic activity resulting from their suitable band edges to realize the photocatalytic redox reaction. The analysis of photocurrent response, linear sweep voltammograms, and photoluminescence demonstrated that the low recombination rate and the efficacious charge transfer of photogenerated carriers could be assigned to the interactive impact of g-C3N4 and SnS2.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 5
·365
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IF 4.3
Yijie Shen,Zhe Liu,Renke Bi,Bianbian Zhou,Yan Wang,Jialong Liu,Zhiyu Wang,Bing Han
Photodegradation of antibiotics based on photocatalytic semiconductors is a promising option to alleviate water pollution. Despite its limitations, TiO2-based photocatalysts are still the most widely studied materials for pollutant degradation. In this work, a pomegranate-like g-C3N4/C/TiO2nano-heterojunction was constructed using the hydrothermal–calcination method, consisting of interconnected small crystals with a dense structure and closely contacted interface. Low-crystallized carbon filled the gap between TiO2and g-C3N4, forming a large interface. The local in-plane heterostructures generated by C/g-C3N4are further improved for carrier transport. As expected, the optimal sample calcined at 300 °C (GTC-300) efficiently eliminated tetracycline hydrochloride (TC-HCl, 20 mg L−1), achieving a removal rate of up to 92.9% within 40 min under full-spectrum irradiation and 87.8% within 60 min under the visible spectrum (λ > 400 nm). The electron mediator, low-crystallized carbon, successfully promoted the formation of new internal electric fields via the widespread heterojunction interface, which accelerated the separation and migration of photogenerated carriers between g-C3N4and TiO2. These results confirm that the g-C3N4/C/TiO2nano-heterojunction exhibited outstanding photodegradation performance of TC-HCl. The electron mediator shows great potential in promoting carrier transfer and enhancing photocatalytic performance of heterogeneous photocatalysts in water treatment.
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
PubMed
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2017
·Vol. 2017
·期 40
·4797-4802
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IF 2.444
Yulan Peng,Lingzhi Wang,Yongdi Liu,Haijun Chen,Juying Lei,Jinlong Zhang
Graphical A CoP-decorated g-C 3 N 4 composite catalyst was developed for highly efficient and stable photocatalytic production of H 2 O 2 under visible-light irradiation. The CoP nanoparticles act as a noble metal free cocatalyst for g-C 3 N 4 to enhance the visible-light absorption and promote the separation of photogenerated charge carriers. A composite catalyst combining CoP with g-C 3 N 4 was explored for the photocatalytic production of H 2 O 2 under visible-light irradiation. The composite catalyst was fabricated by growth of CoP nanoparticles on the surface of g-C 3 N 4 . The CoP nanoparticles were well dispersed on the surface of g-C 3 N 4 and could interact with g-C 3 N 4 to improve charge separation and electron transfer. The composite catalyst showed superior catalytic activity compared with pure CoP or g-C 3 N 4 under visible-light irradiation. The optimal catalyst with 1.76 wt.-% CoP loading exhibited the best photocatalytic efficiency with an H 2 O 2 production of 140 µ m in 2 h, which is about 4.6 and 23.3 times those of pure g-C 3 N 4 and pure CoP, respectively. A possible mechanism for the visible-light-driven photocatalytic production of H 2 O 2 is proposed. The composite catalyst exhibited stable performance without obvious loss of catalytic activity after seven successive runs, and thus has good application prospects in sustainable H 2 O 2 production.
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
Nanomaterials
·
2019
·Vol. 10
·期 1
·1
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IF 4.034
Rui Geng,Juanjuan Yin,Jingxin Zhou,Tifeng Jiao,Yao Feng,Lexin Zhang,Yan Chen,Zhenhua Bai,Qiuming Peng
The construction of heterojunctions provides a promising strategy to improve photocatalytic hydrogen evolution. However, how to fabricate a nanoscale TiO2/g-C3N4heterostructure and hinder the aggregation of bulk g-C3N4using simple methods remains a challenge. In this work, we use a simple in situ construction method to design a heterojunction model based on molecular self-assembly, which uses a small molecule matrix for self-integration, including coordination donors (AgNO3), inorganic titanium source (Ti(SO4)2) and g-C3N4precursor (melamine). The self-assembled porous g-C3N4nanotube can hamper carrier aggregation and it provides numerous catalytic active sites, mainly via the coordination of Ag+ions. Meanwhile, the TiO2NPs are easily mineralized on the nanotube template in dispersive distribution to form a heterostructure via an N–Ti bond of protonation, which contributes to shortening the interfacial carrier transport, resulting in enhanced electron-hole pairs separation. Originating from all of the above synergistic effects, the obtained Ag/TiO2/g-C3N4heterogenous photocatalysts exhibit an enhanced H2evolution rate with excellent sustainability 20.6-fold-over pure g-C3N4. Our report provides a feasible and simple strategy to fabricate a nanoscale heterojunction incorporating g-C3N4, and has great potential in environmental protection and water splitting.Keywords:heterojunction;Ag/TiO2/g-C3N4;Co-assembly;hydrogen evolution
研究领域:
材料科学
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环境科学
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光催化
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 42
·期 1
·489-496
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IF 3.269
Zengyu You,Qianhong Shen,Yuxuan Su,Yang Yu,Hui Wang,Tian Qin,Fang Zhang,Di Cheng,Hui Yang
A novel Z-scheme core–shell g-C3N4/MCNTs/BiOI heterojunction was successfully designed and fabricated through filling multi-walled carbon nanotubes (MCNTs) with g-C3N4, followed by the loading of BiOI on the outer surface of the MCNTs. The structure–property relationship was analyzed by X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectra (DRS), photoluminescence spectra (PL), ESR probe tests and reactive species trapping measurements. The results show that the BiOI nanoparticles are uniformly loaded on the surface of the MCNTs which are fully filled by g-C3N4. The MCNTs connect the two semiconductors of g-C3N4 and BiOI, and serve as electron mediating conductors to promote the transfer of the photo-generated electrons, thereby constructing a Z-scheme heterojunction between g-C3N4 and BiOI. With this unique structure, enhanced visible-light photocatalytic activities are achieved because of the synergistic effect of light harvesting and improved separation efficiency of photo-generated carriers.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Fanwei Meng,Chao Qu,Lanyang Wang,Decai Yang,Zezhong Zhao,Qing Ye
Photocatalytic CO 2 reduction technology plays a significant role in the energy and environmental sectors, highlighting the necessity for developing high-efficiency and stable catalysts. In this study, a novel photocatalyst, x NiCo 2 O 4 /CN ( x = 1, 3, and 5 wt%), was synthesized by depositing zeolitic imidazolate framework-67 (ZIF-67)-derived nickel cobaltate (NiCo 2 O 4 ) hollow nanocages onto porous graphitic carbon nitride ( g -C 3 N 4 , CN) nanosheets for photocatalytic CO 2 reduction. Under visible light irradiation, the resulting 3NiCo 2 O 4 /CN photocatalyst demonstrated exceptional CO yields of up to 2879.5 μmol g −1 h −1 , surpassing those of NiCo 2 O 4 and CN alone by factors of 3.3 and 11.6, respectively. The introduction of hollow NiCo 2 O 4 nanocages increased the specific surface area of the material and enhanced the number of active sites, while strengthening visible light absorption. The creation of a built-in electric field, induced by the Fermi level difference between the two materials, was confirmed through ultraviolet photoelectron spectroscopy (UPS) characterization. This resulted in the formation of a Z-scheme heterojunction, significantly enhancing the separation and migration of photogenerated charge carriers. Notably, 3NiCo 2 O 4 /CN exhibits excellent stability during long-term photocatalytic reactions, ensuring reliable performance for practical applications. This study offers novel insights and methodologies for developing efficient photocatalytic CO 2 reduction catalysts.
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
PubMed
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
·
IF 3.958
Zhiwei Li,Guodong Jiang,Zihao Zhang,Ye Wu,Yinhui Han
Photocatalysts Phosphorus-Doped g-C 3 N 4 (P(x%)-g-C 3 N 4 ) were successfully prepared by a two-step method using melamine and phosphonitrilic chloride trimer (Cl 6 N 3 P 3 ). Then, the Phosphorus-doped g-C 3 N 4 sheets coated with TiO 2 nanoparticles (P(x%)-g-C 3 N 4 /TiO 2 ) were prepared by solvent-thermal method. The as-prepared P(x%)-g-C 3 N 4 /TiO 2 composites showed enhanced light absorption and photocatalytic properties in visible light region. The morphology of g-C 3 N 4 nanosheets and square flake TiO 2 nanoparticles were analyzed with field emission scanning electron microscopy (FESEM) and scanning electron microscopy (SEM). X-ray photoelectron spectroscopy (XPS) proved that the P-C bonds were generated in P(x%)-g-C 3 N 4 . Photoluminescence (PL) spectra revealed that the phosphorus doping improved the separation and transfer of photogenerated electrons and holes in P(x%)-g-C 3 N 4 , UV–vis diffuse reflectance spectra (UV-vis DRS) indicated that the P(x%)-g-C 3 N 4 /TiO 2 heterostructure enhanced the absorption of visible light. The photocatalytic activity of the P(x%)-g-C 3 N 4 was evaluated by photocatalytic degradation of Methyl Blue (MB) under visible light irradiation. The result indicated that the P(0.1%)-g-C 3 N 4 /TiO 2 composite present considerably high photocatalytic degradation activities on MB, and the degradation of MB by P(0.1%)-g-C 3 N 4 /TiO 2 were 5.1 times and 2.9 times as high as that of g-C 3 N 4 and P25, respectively. At the end of article, a possible photocatalytic mechanism was discussed based on the experimental results.
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
危险品化学品经营许可证（带存储）