CHEMOSPHERE
·
2024
·
IF 8.1
Long Chen,Miao Li,Ying Yang,Xiaoqing Qiu
The strong metal-support interactions (SMSI) can profoundly affect the electronic state of platinum (Pt) cocatalysts, which plays a dominant role for photocatalytic activity in the supported photocatalysts. However, the conventional Pt/g-C 3 N 4 photocatalysts usually shows negligible SMSI effect because of the lack of the reducible species. Herein, we demonstrate that the linker engineering of UiO66-type MOFs can effectively strengthen the SMSI and optimize the electron density of Pt nanoparticles on g-C 3 N 4 nanosheets. The enhancement of electron-donating ability of the ligand functional groups effectively enriches the electron density of Pt cocatalysts, thus accelerating the photocatalytic hydrogen evolution rate. The results show that CN@Pt@UiO66-NA (the electron-donating functional group modified) exhibits the excellent photocatalytic hydrogen evolution activity (4.22 mmol g −1 h −1 ), which is 2.7 times that of CN@Pt@UiO66-NO 2 (the electron-withdrawing functional group modified).
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高影响因子
Advanced Sustainable Systems
·
2024
·
IF 6.5
Xiaohan Sun,Jinliang Zhu,Qianqian Yu,Jiazuo Zhou,Fangmiao Wang,Zishuai Jiang,Yifan Liu,Yuan Yu,Yingxin Li,Haiyue Yang,Yudong Li,Chengyu Wang
Photocatalysis technology of g-C 3 N 4 is of great value in wastewater treatment, thus calling for developing a concise and high-efficiency method to improve its photocatalytic efficiency. Here, a novel photocatalyst consisting of tourmaline particles (TPs) and graphitic carbon nitride (g-C 3 N 4 ) is prepared by a step calcining method with enhanced photocatalytic performance. The self-polarized electric field of TPs attracts the photogenerated electrons generated by the catalyst and delays the recombination rate of electron-hole pairs, for which reason the prepared photocatalyst exhibits a wider spectral response and stronger photocatalytic activity. The mechanism analysis exhibits that the reactive substances including h + , ·OH, 1 O 2 , and ·O 2 − generated by TPs/g-C 3 N 4 effectively eliminate the contaminant during photocatalysis. The degradation efficiency of Rhodamine B (RhB) of g-C 3 N 4 -0.5% TPs is increased from 88.47% to 97.76% after 30 min illumination compared with pure g-C 3 N 4 . Furthermore, to facilitate catalyst recycling and reuse, a photocatalytic lignocellulose membrane is prepared. After five cycles, the degradation efficiency of the membrane decreases from 97.89% to 95.54%, still maintaining 97.60%. This study has constructed an innovative tourmaline/g-C 3 N 4 photocatalyst and recyclable photocatalytic lignocellulose membrane with enhanced pollutant degradation properties by introducing naturally polarized minerals, providing a new approach for efficient water treatment.
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TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Yong Xu,Baoyu Yu,Ruixin Wang,Kunhong Hu,Tianhui Ren
The inferior dispersion stability and simple functionality of MoS 2 -based nanofluids restrict their efficient application in lubrication. Herein, a novel nanofluid composed of C 3 N 4 /MoS 2 , 3-isocyanatopropyltrimethoxysilane, and C 3 N 4 /MoS 2 -catalyzed product (polyethylene glycol-borate ester, PEG-BA) was proposed. C 3 N 4 nanosheets could induce the formation of regular MoS 2 nanospheres. The resulting C 3 N 4 /MoS 2 showed excellent catalytic activity for the esterification of PEG-BA. The C 3 N 4 /MoS 2 @PEG-BA nanofluid exhibited favorable dispersion stability in PEG600 with no stratification for ≥ 82 days. The addition of 3.0 wt% C 3 N 4 /MoS 2 @PEG-BA nanofluid could significantly reduce friction coefficient (30.7 %) and wear scar diameter (28.9 %). The excellent lubrication properties of the nanofluid are attributed to the synergistic lubrication effect of C 3 N 4 /MoS 2 and PEG-BA. Furthermore, the nanofluid exhibits remarkable photothermal conversion performance in both oil and air mediums.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zhenxing Chen,Lifeng Gui,Hao Wang,Xiaohui Lu,Congcong Wu,Xiaojie Yang,Yanyan Li,Li Zhao,Shimin Wang
Interface recombination is the main challenge associated with the MAPbI 3 perovskite solar cells. Aim of this study was to inttroduce anthracene rings into the g-C 3 N 4 framework to enhance the conjugation as well as electron extraction and transport capabilities. It showed that the introduction of a conjugated system containing anthracene ring modified g-C 3 N 4 (AACN) as an interface modification layer reduced the interfacial carrier recombination resulting in an increase of device efficiency from 11.35 % to 14.97 %. Under unpacked condition, 500 h of testing at a relative humidity of 30 %, the AACN modified MAPbI 3 perovskite solar cells showed efficiency retention of 80 % compared to 56 % retention observed for MAPbI3 perovskite solar cells. It provides an insight for the application of conjugated systems to modify g-C 3 N 4 and its application in photovoltaic devices.
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RSC Advances
·
2024
·Vol. 14
·期 7
·4861-4870
·
IF 3.9
Yibo Zhao,Yueyang Li,Lu Chang,Wenjing He,Keling Liu,Minjie Cui,Shengnan Wang,Yujia Zhao,Xinyu Tan
Bimetal doped Cu–Fe-zeolitic imidazole framework-8 (ZIF-8)/graphitic carbon nitride (GCN) (Cu–Fe-ZIF-8/GCN) nanocomposites were prepared via one-pot and ion-exchange methods. The main influencing factors, such as adsorbent concentration, TC concentration, initial pH, and coexisting ions, were evaluated in detail. Due to the suitable pore structures and the presence of multiple interactions on the surface, the nanocomposite showed a high adsorption capacity up to 932 mg g−1 for tetracycline hydrochloride (TC), outperforming ZIF-8 by 4.8 times. The adsorption kinetics and adsorption isotherm were depicted in good detail using pseudo-second-order kinetic and Langmuir models, respectively. Thermodynamic calculation revealed that the adsorption of the nanocomposite under experimental conditions was a spontaneous heat absorption process, and was primarily driven by chemisorption. After four cycles of use, the nanocomposite retained 87.2% of its initial adsorption capacity, confirming its high reusability and broad application prospects in removing tetracycline-type pollutants from wastewater.
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Chuanhao Li,Yi Tian,Shuangyu Wang,Ping Yang,Xiao Zhang
To improve the stability of Ag based co-catalysts and to increase the photocatalytic performance of graphitic carbon nitride (g-C 3 N 4 ), Ag 2 Se nanoparticles were grown onto superior thin sulfur-doped g-C 3 N 4 nanosheets which was fabricated via two-step thermal polymerization at high temperature. Ultrathin S-doped g-C 3 N 4 nanosheets were prepared via two-step thermal polymerization using melamine and thiourea. The ratios of Ag 2 Se were adjusted to fabricate a series of Ag 2 Se/S-g-C 3 N 4 (Ag 2 Se/SCN) composite samples by controlled solvothermal synthesis. S-doping plays an important role in mono-dispersion of Ag 2 Se nanoparticles on S-g-C 3 N 4 nanosheets because of the control of growth sites. The photocatalytic removal of tetracycline hydrochloride test indicates that sample Ag 2 Se/SCN-3 with Ag 2 Se loading of 3 % reveals the best removal effect, in which tetracycline hydrochloride of 60 % is removed within 60 min. Photocatalytic hydrogen generation test results without co-catalyst addition demonstrate that sample Ag 2 Se/SCN-3 exhibits the best H 2 evolution rate of 2116.35 μmol·g −1 ·h −1 , which is 3.8 times of that of pure carbon nitride. The photocatalytic mechanism tests suggest that Schottky heterojunctions are formed in the Ag 2 Se/S-g-C 3 N 4 composites. The formation of Schottky heterojunctions improved the separation efficiency of photogenerated charge carriers. The incorporation of Ag 2 Se nanoparticles (as the co-catalyst) on S-g-C 3 N 4 nanosheets is the key for drastically improving the photocatalytic performance and eliminating the use of Pt co-catalyst during the photocatalytic processes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hongji Chen,Yan Wu,Huiping Xiao,Hongfei Yin,Qian Fei,Chunyu Yuan,Qiuyu Zhao,Yujin Zhang,Yongzheng Zhang,Woonming Lau
Owing to the low conversion efficiency of Fe 3+ to Fe 2+ during the peroxymonosulfate (PMS) activation process, the design of an efficient Fenton-like catalyst is still a challenge. In this work, 0D/2D Co-doped Fe 2 O 3 /g-C 3 N 4 (CNCFO) composite catalysts were constructed for organic pollutant degradation, where the Co-doping not only boosts the conversion efficiency of Fe 3+ to Fe 2+ , but also acts as active site for PMS activation. Among them, CNCFO2 showed excellent catalytic performance, where 96.4% of MO could be degraded within 45 s. X-ray photoelectron spectroscopy (XPS) confirmed that the cobalt doping promoted the cycle of Fe 3+ /Fe 2+ , which was responsible for the enhanced PMS activation. Meanwhile, the good stability and reusability of CNCFO2 itself provide opportunities for its potential practical applications. Based on systematical characterizations, the Z-scheme photo-Fenton mechanism was proposed. This study offers a fresh perspective on the advancement of designing highly efficient Fenton-like catalyst for applications in the field of environmental purification.
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ChemistrySelect
·
2024
·Vol. 9
·期 9
·e202304054
·
IF 1.9
Caihong Xue,Xianlan Wang,Guijun Yang,Hao Yang,Hui Nan,Guocai Ma,Shiai Xu
Graphical A larger specific surface area and three-dimensional (3D) permeable lamellae carboxylated g-C 3 N 4 (HCN) are successfully prepared by HNO 3 and introduced into the PVDF-HFP to obtain a high-performance composite separator. The wettability and ionic conductivity of separator can be improved through the carboxylated HCN. The LFP || Li half-cell of the separator has a capacity of 71 % at a 5 C rate and 94 % after 400 cycles at a 2 C rate. Polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) is a standard electrolyte membrane and binder material for lithium-ion batteries (LIBs) because of the benefits of membrane formation and strong mechanical properties. Still, its use is limited due to unavoidable defects such as high crystallinity and poor electrochemical performance. In this paper, a larger specific surface area and three-dimensional (3D) permeable lamellae carboxylated g-C 3 N 4 (HCN) were successfully prepared by HNO 3 and introduced into the PVDF-HFP to obtain a high-performance composite separator. The wettability and electrolyte absorption of PVDF-HFP separator can be improved through the carboxylated HCN. More crucially, because PVDF-HFP has several active sites and low crystallinity, adding HCN can greatly increase the ionic conductivity of separators. The ionic conductivity of PH-HCN at 25 °C is 0.52 S cm −1 , 4.7 times higher than the initial PVDF-HFP membrane, and the oxidation potential can reach 4.8 V. The assembled lithium-ion batteries half-cell has a capacity of 71 % at a 5 C rate and 94 % after 400 cycles at a 2 C rate. Therefore, the improved separator has the potential to be applied to high-performance LIBs.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Yu Zhang,Mengfei Tian,Bin Qiao,Jiabo Cheng,Yaru Zhang,Kuiwang Chen,Jie Liu,Chunjian Zhao,Chunying Li
As one of the most widely used antibiotics, sulfamethoxazole (SDZ) poses significant health risks to the ecological environment by causing harm to aquatic organisms and accelerating evolution of antibiotic resistant bacteria. Metalloporphyrin hydrogen-bonded organic framework (PFC-72) demonstrates promising prospect in the field of photocatalysis owing to its high specific surface area, wide light harvesting range, stable physical and chemical properties, and semiconductor properties. Herein, we constructed an efficient photocatalyst PFC-72/g-C 3 N 4 by one-step solvent thermal method for photocatalytic degradation of SDZ. When doping content of PFC-72 is 10 %, photocatalytic degradation efficiency of SDZ can reach 96.82 % after 120 min of visible light irradiation, and PFC-72/g-C 3 N 4 exhibits excellent structural stability. The photocatalytic efficiency of SDZ is improved by increasing specific surface area, enhancing absorption range of visible light, and inhibiting recombination of photogenerated electron-hole pairs. In addition, photodegradation pathways of SDZ in PFC-72/g-C 3 N 4 was determined by UPLC-MS/MS analysis. Finally, dominant reactive species (·O 2 − , h VB + , and ·OH) in the system were detected through free radical masking experiments, and photocatalytic mechanism was clarified. This work investigates a novel and efficient porphyrin-HOF based photocatalyst, which has great potential for degradation of SDZ.
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高影响因子
CRYSTENGCOMM
·
2024
·Vol. 26
·期 38
·5440-5451
·
IF 2.6
Xiaoyun Ye,Hangyu Zhong,Yumei Zhang,Xuehua Liu,Wei Tian,Li-An Ma,Qianting Wang
Previous studies on photocatalytic technology have shown that doping co-catalysts and constructing composite heterojunctions are effective strategies for improving the photocatalyst performance. The Ti3C2/SrTiO3/g-C3N4 composite photocatalyst with a gradient heterostructure was prepared by the high-temperature calcination method with Ti3C2 as the co-catalyst. The effects of g-C3N4 content on the microstructure and hydrogen evolution rate of the Ti3C2/SrTiO3/g-C3N4 composites were investigated under simulated sunlight. The results showed that the photocatalyst with 60 wt% of g-C3N4 had the optimal hydrogen evolution rate of 1733.13 μmol g−1 h−1 after simulated sunlight irradiation for 4 h, which was approximately 3.3 times higher than that of Ti3C2/SrTiO3. After four photocatalytic hydrogen evolution cycles, no significant decrease in the hydrogen evolution rate of the Ti3C2/SrTiO3/g-C3N4 composite was observed. This work may serve as a rational reference on the synergistic effect of heterostructures and cocatalysts to improve the separation effect of electron–hole pairs, thus improving the hydrogen evolution effect of the catalyst.
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JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Haohuan Yuan,Wenting Xiao,Xin Zhang,Jiao Bao,Wei Li,Bo Huang,Guannan He
Efficient carrier separation and high electron migration efficiency are essential for sustainable H 2 energy production via photocatalysis . In this work, a Mn 0.5 Cd 0.5 S/Ti 3 C 2 MXene/g-C 3 N 4 all-solid-state Z-scheme photocatalyst is constructed by a series of processes, including low temperature calcination , etching, ultrasonication and solvothermal process. The appropriate energy band structures of g-C 3 N 4 and Mn 0.5 Cd 0.5 S enable the formation of the Z-scheme system, achieving efficient carrier separation. The Ti 3 C 2 MXene flakes assembled between g-C 3 N 4 nanosheets and Mn 0.5 Cd 0.5 S particles can accelerate the charge migration rate in the system. The optimized ternary composite exhibits the highest hydrogen evolution rate (HER) of 13.7 mmol g −1 h −1 , which is much higher than that of the pure g-C 3 N 4 and Mn 0.5 Cd 0.5 S. Meanwhile, the apparent quantum yield (AQY) value of the composite at 420 nm reaches up to 24.07 % and exhibits high stability. Based on the characterization, the photocatalytic mechanism of carrier transfer in the Z-scheme heterojunction is also revealed. The finding of this article provides insights into the high efficiency of carrier transfer and separation in the photocatalytic reactions.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shuting Guo,Qiongfang Zhuo,Gang Huang,Liying Lan,Tongyin Zhu,Wenlong Wang,Zehong Yang,Jiasheng Fang,Yongfu Qiu,Bo Yang
Imidacloprid (IMD) is a kind of neonicotinoid insecticide, which is widely used in the agricultural production. There are few reports on electrocatalytic degradation of IMD with the low concentration. In this study Ti 4 O 7 -C 3 N 4 electrode was employed for the first time to electrocatalytically degrade low concentration IMD. Compared with pure Ti 4 O 7 electrode, the oxygen evolution potential was increased from 1.84 V to 2.50 V, the charge transfer resistance (R ct ) was reduced by 66.05 %, and the oxygen vacancies were increased by 2.5 times compared to the original Ti 4 O 7 . Especially, the R ct for Ti 4 O 7 (5.45 Ω·cm 2 ) was only 1/7 of that for boron-doped diamond (BDD) (38.89 Ω·cm 2 ). IMD degradation ratio was up to 98 % in only 1.256 min (75.360 s) using a Ti 4 O 7 -C 3 N 4 . When SongShan Lake water, Wanjiang water, and secondary effluent were treated, the degradation radios of IMD were 70.30 %, 72.33 % and 81.12 %, respectively. In the presence of Cl − coexisting ions, no disinfection by-product of ClO 4 − was detected, which is an advantage for Ti 4 O 7 -C 3 N 4 compared with BDD. The first and 48th degradation ratios were 99 % and 97 %, respectively, indicating the good stability of Ti 4 O 7 -C 3 N 4 . The development of Ti 4 O 7 -C 3 N 4 provides a stable, low energy consumptions and no secondary pollution anode for the treatment of actual wastewater.
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