APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Jiaojiao Fang,Yukai Chen,Wei Wang,Liang Fang,Chunhua Lu,Cheng Zhu,Jiahui Kou,Yaru Ni,Zhongzi Xu
Herein we first coupled a wide photo-response photocatalyst with plasmon-enhanced triplet − triplet annihilation upconversion (TTA-UC) nanoparticles for photocatalytic hydrogen generation. The plasmon-based enhancement of TTA-UC was achieved by introducing Au nanoparticles into the core liquid of TTA-UC nanoparticles containing platinum(II)-octaethylporphyrin and 9,10-diphenylanthracene. Au-TTA nanoparticles encapsulated by silica shells significantly increased the green-to-blue upconversion compared with TTA nanoparticles. The silica shells after further surface functionalization can conjoin with photocatalysts. To improve the stability of cadmium sulfide (CdS), graphitic carbon nitride (g-C 3 N 4 ) was combined with CdS for g-C 3 N 4 -CdS heterojunctions. g-C 3 N 4 -CdS sheets based on Au-enhanced TTA-UC can utilize the upconverted high-energy photons and thereby realized efficient photocatalytic hydrogen production. Au-TTA nanoparticles conjoined with g-C 3 N 4 -CdS reached a high hydrogen production of 16.88 mmol g −1 under visible-light irradiation and an apparent quantum efficiency of 1.439% under green-light irradiation. The study provides a new TTA-supported upconversion-photocatalysis system enhanced by Au plasmon resonance effect for effectively hydrogen generation.
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Royal Society Open Science
·
2019
·Vol. 6
·期 7
·
IF 2.515
Xuecheng Liu,Qian Zhang,Liwei Liang,Lintao Chen,Yuyou Wang,Xiaoqing Tan,Li Wen,Hongyu Huang
CoO/g-C3N4 hybrid catalyst is facilely prepared for application to photocatalytic H2 evolution from water splitting by the vacuum rotation–evaporation and in situ thermal method. The physical and chemical properties of CoO/g-C3N4 are determined by a series of characterization methods. The g-C3N4 with 0.6 wt% Co loading exhibits superior photocatalytic hydrogen evolution activity with an H2 evolution amount of 23.25 mmol g−1 after 5 h. The obtained 0.6 wt% CoO/g-C3N4 can split water to generate 0.39 mmol g−1 H2 without sacrificial agent and noble metal, while the pure g-C3N4 is inactive under the same reaction conditions. The remarkable enhancement of photocatalytic H2 evolution activity of CoO/g-C3N4 composites is mainly ascribed to the effective separation of electron–hole pairs and charge transfer. The work creates new opportunities for the design of low-cost g-C3N4-based photocatalysts with high photocatalytic H2 evolution activity from overall water splitting.
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 9
·5736-5742
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IF 1.093
Bai Jirong,Lv Wenhua,Xu Haiyang,Chen Gang,Ni Zhijiang,Wang Zhilei,Qin Hengfei,Zheng Zheng,Li Xi
Ag3PO4/sulfur-doped g-C3N4 heterojunctions were fabricated by the means of a facile calcination and co-precipitation method. Structural characterization suggested that Ag3PO4 was successfully loaded onto sulfur-doped
g-C3N4. The absorption band edges of sulfur-doped g-C3N4 were shifted to the longer wavelength in comparison with bulk g-C3N4. The Ag3PO4/sulfur-doped g-C3N4 heterojunctions manifested
substantially higher visible-light photocatalytic performance as compared with Ag3PO4/bulk g-C3N4. Photoluminescence spectra suggested that the stable Ag3PO4/SGCN heterojunctions could effectively address the electron—hole
recombination rate, together with remarkably enhancing the photocatalytic activity. The enhancement of light absorption and better dispersion in Ag3PO4/sulfur-doped g-C3N4 provide more migration channels, together with posing crucial responsibility
for the enhanced photocatalytic performance.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wei Chen,Shu-Chang Wu,Zhi-Jun Xia,Guo-Bo Huang,Jun Hu
In this research, we rationally designed and synthesized quantum dots self-decorated SnIn 4 S 8 /g-C 3 N 4 (QDs-SISCN) nanocomposites by in situ anchoring quantum dot (QDs) self-decorated SnIn 4 S 8 (SIS) nanosheets onto the surface of mesoporous graphite carbon nitride (CN) nanosheets in a mixed solvothermal environment. The photoreduction of 4-nitroaniline (4-NA) was used to assess their photocatalytic activity. In this framework, the construction of CN nanosheets-supported QDs-decorated SIS homojunctions can integrate the advantages of both homojunctions and heterojunctions . Benefiting from those favourable properties, the QDs-SISCN nanocomposites exhibit superior photocatalytic activity towards 4-NA reduction under visible-light irradiation (λ > 400) as a result of the optimizied amount of CN nanosheets added. The recycling experiments also reveal high stability of the QDs-SISCN nanocomposites during photocatalytic reactions for 4-NA reduction. Moreover, the investigation of the photocatalytic mechanism from systematic characterizations, including measurements of the photocurrent response, electrochemical impedance spectroscopy (EIS) and photoluminescence (PL) indicate that the improved separation efficiency of charge carriers is a critical parameter for the enhanced photocatalytic activity for 4-NA reduction. We expect this research to provide a promising path to the design and synthesis of highly efficient hybrid photocatalysts for functional-group transformations.
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JOURNAL OF CATALYSIS
·
2017
·
IF 6.844
Yanning Shi,Jingjing Chen,Zhiyong Mao,Bradley D. Fahlman,Dajian Wang
In this work, Z-scheme heterostructure were constructed over the visible light response g-C 3 N 4 photocatalysts by loading Porous silicon (PSi) to enhance the photocatalytic H 2 evolution performance. The synthesized Z-scheme g-C 3 N 4 /PSi composites with a PSi loading content of 2.50 wt% achieves the highest photocatalytic H 2 evolution rate at 870.4 µmol h −1 g −1 , which is about 2 times as high as the pure g-C 3 N 4 with H 2 evolution rate of 427.2 µmol h −1 g −1 . Various techniques including XRD, SEM, TEM, FTIR, XPS, UPS, PL and electrochemical method were employed to demonstrate the successful construction of g-C 3 N 4 /PSi composites and to investigate the origin of the enhanced potocatalytic activity. The formed heterostructure between g-C 3 N 4 nanosheets and PSi were verified to be the dominant reason for the enhancement of photocatalytic activity, resulting from the separation promotion of photogenerated charge carriers in a direct Z-scheme mechanism. This study presented a promising Z-scheme g-C 3 N 4 /PSi photocatalysts with promising H 2 evolution performance, which might drive the progress of solar energy conversion technologies.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2017
·Vol. 2017
·期 40
·4797-4802
·
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.
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CHEMOSPHERE
·
2024
·
IF 8.1
Yuesen Wang,Yanchun Huang,Yi Chen,Luming Dou,Yi Ren,Naiwen Li,Bo Lai,Bo Tan
Cobalt-based materials are promising catalysts for activating peroxymonosulfate (PMS) to degrade organic pollutants. Among various cobalt-based catalysts, the alteration in cobalt species and the reactive species produced are not fully understood. Herein, four materials were synthesized by controlling synthesis methods and doping of g-C 3 N 4 to regulate cobalt species. Through two methods, ZIF/Co and Co 3 O 4 , whose main cobalt species are Co–O/Co–N and Co O/O–Co O, were synthesized. On this basis, ZIF/Co–CN and Co 3 O 4 –CN were synthesized by adding g-C 3 N 4 . Then, the four materials were used to activate PMS for carbamazepine (CBZ) degradation, focusing on the correlation between active sites and reactive species. Co O/O–Co O mainly led to the formation of free radicals, while Co–N tended to produce non-free radicals. The addition of g-C 3 N 4 would facilitate non-free radical catalysis by promoting the conversion of Co–O to Co–N and enhancing the catalytic role of C and N. Finally, the systems with a high proportion of non-free radicals showed better degradation performance when multiple pollutants co-existed, and reactive species may be selective to different pollutants. The findings have significance for the synthesis design of cobalt-based catalysts and the regulation of reactive species to degrade different pollutants practically.
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高影响因子
CATALYSIS TODAY
·
2024
·
IF 5.2
Sen Wang,Hong Chen,Qing Lin,Qian Lu,Wei Lv,Can Wang,Linhao Yu,Yingying Li,Yongdan Li
Two significant strategies for enhancing photocatalyst performance are heterojunction construction and band gap modulation, but up until now, these methods have typically been treated separately. This work examines a strategy combining the heterojunction with a mid-gap state to prepare a novel Cr 2 O 3 modified Cr-doped g-C 3 N 4 photocatalyst for antibiotics degradation. According to the characterization results, the integration of Cr 3d orbital energy level into the original band gap of g-C3N4 results in the formation of Cr-doped g-C 3 N 4 , leading to a reduction in the band gap from 2.80 eV to 2.36 eV. Besides, the constructed Z-type heterojunction enhances the separation of photoinduced carriers. The degradation experiments of tetracycline proved the significant enhancement in the photocatalytic performance of the prepared catalyst. In addition, the degradation effect of the prepared catalyst on tetracycline in micro-polluted lake water was also investigated, revealing the applicability of the catalyst in the purification of natural water environments.
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RSC Advances
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2015
·Vol. 5
·期 80
·64976-64982
·
IF 3.84
Shuaishuai Ma,Jinjuan Xue,Yuming Zhou,Zewu Zhang,Zhilan Cai,Daibao Zhu,Shuang Liang
A facile hard template approach has been developed to prepare mpg-C3N4/TiO2 composites using SiO2 nanoparticles as a hard template and cyanamide as a precursor. The samples have been well characterized using X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). The results demonstrate that TiO2 nanoparticles sized 5–10 nm were distributed on the surface of mpg-C3N4 to form the mpg-C3N4/TiO2 heterojunction photocatalyst. In this way, the mpg-C3N4/TiO2 heterojunction catalyst has a porous structure and large surface area, which increases the contact area for pollutants. Rhodamine B (RhB) was used as a representative organic pollutant to evaluate the photocatalytic activity of the samples under visible light irradiation. The results show that the as-prepared mpg-C3N4/TiO2 heterojunction catalyst has a significantly enhanced visible light photocatalytic activity compared to pure mpg-C3N4 and that the degradation rate was 1.6 times higher than that of pure mpg-C3N4. The increased photocatalytic activity of the mpg-C3N4/TiO2 heterojunction catalyst can be attributed to the formation of the heterojunction between mpg-C3N4 and TiO2, which suppresses the recombination of photoinduced electron–hole pairs. Furthermore, based on systematic characterization and discussion, a possible photocatalytic mechanism for the excellent photocatalytic performance was proposed.
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JOURNAL OF MOLECULAR LIQUIDS
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2024
·
IF 5.3
Huan Cheng,Kuang Luo,Xiaojun Wen,Lijun You,Ning Cai,Jumei Li
In this work, we proposed a straightforward self-assembly and in-situ deposition protocol to construct Cu 2 O/g-C 3 N 4 /Ag composites, which demonstrated peroxidase-like attribute and exceptional SERS activity. These composites proved to be an effective SERS analysis tool for detecting organic fungicides like malachite green (MG) and crystal violet (CV). Remarkably, they achieved detection limits as low as 10 −9 M in DI water as well as fish pond water, and exhibited a strong linear correlation between logarithmic concentrations and SERS intensities (R 2 ≥ 0.97). Beyond that, with the aid of hydrogen peroxide (H 2 O 2 ), the peroxidase-like Cu 2 O/g-C 3 N 4 /Ag composites rapidly degraded MG and CV molecules within just 5 min. Furthermore, their practical reusability based on the peroxidase-like reaction was proved by high SERS performance across 5 detection cycles. These results emphasize the immense potential of Cu 2 O/g-C 3 N 4 /Ag in SERS-based trace fungicide detection and suggest future applications in ecological restoration through peroxidase-like reactions.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 3
·1872
·
IF 4.9
Jian Feng,Li Wang,Bo Xiao,Xia Ran,Caiying Wang,Jinming Zhu,Zuoji Liu,Chaozhong Li,Xinai Cui,Rong Li,Guangwei Feng,Zeqin Dai
Photocatalytic technology has been recently conducted to remove microbial contamination due to its unique features of nontoxic by-products, low cost, negligible microbial resistance and broad-spectrum elimination capacity. Herein, a novel two dimensional (2D) g-C3N4/Bi(OH)3(CNB) heterojunction was fabricated byincorporating Bi(OH)3(BOH) nanoparticles with g-C3N4(CN) nanosheets. This CNB heterojunction exhibited high photocatalytic antibacterial efficiency (99.3%) againstEscherichia coli(E. coli) under visible light irradiation, which was 4.3 and 3.4 times that of BOH (23.0%) and CN (28.0%), respectively. The increase in specific surface area, ultra-thin layered structure, construction of a heterojunction and enhancement of visible light absorption were conducive to facilitating the separation and transfer of photoinduced charge carriers. Live/dead cell staining, sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) assays and scanning electron microscopy (SEM) have been implemented to investigate the damage to the cell membrane and the leakage of the intracellular protein in the photocatalytic antibacterial process. The e−, h+and O2•−were the active species involved in this process. This study proposed an appropriate photocatalyst for efficient treatment of bacterial contamination.
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高影响因子
RARE METALS
·
2024
·
IF 9.6
Wang Wei-Wei,Huang Rui,Tao Yu,He Peng,Tuo Su-Xing,Bian Yu-Jian,Hu Rui-Ting,Yan Jun,Liang Yan-Jie,Zhang Wen-Chao
The electrochemical utilization of Zn anodes in aqueous batteries is hampered by the intricate and interconnected issues of Zn dendrite growth, H 2 evolution and Zn corrosion reactions. In this study, a multifunctional protective layer comprising MXene and graphitic carbon nitride (g-C 3 N 4 ) was constructed using a self-assembly strategy. The MXene/g-C 3 N 4 protective layer exhibited robust zincophilic characteristics, which facilitated a uniform distribution of the electric field and ensured a sufficient influx of Zn 2+ . This reduces the Zn 2+ nucleation barrier and prevents dendrite growth. In addition, the hydrophobic nature of the protective layer, coupled with its negative charge, can repel SO 4 2− and select water molecules from the electrolyte, which aids in mitigating corrosion and H 2 evolution. The symmetric Zn cell coated with the MXene/g-C 3 N 4 protective layer showed remarkable stability, achieving over 2000 h of reversible cycling at 1 mA·cm −2 . Furthermore, the MXene/g-C 3 N 4 -coated Zn anode paired with a sodium-doped V 2 O 5 cathode (NVO) exhibited enhanced cycling capability over 1500 cycles. Graphical Abstract
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