JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xin Xiao,Yaoting Wang,Huimin Zhang,Zhiling Chou,Haochen Ding,Xinyu Lu,Yiming Zou,Li Chen,Dongping Sun
This study investigated the controllable synthesis method and photocatalytic performance of a g-C 3 N 4 /MnIn 2 S 4 heterostructure. Through a carefully designed experimental scheme, the g-C 3 N 4 /MnIn 2 S 4 heterostructure was successfully prepared, and its composition, structure, and morphology were thoroughly characterized. The experimental results demonstrated that the heterostructure achieved a high photodegradation efficiency of 92.3% for RhB and 72.8% for TC under visible light, significantly outperforming its individual components. After four cycles, the degradation rate remained relatively stable. The photocatalytic reaction mechanism was thoroughly investigated by adding different trapping agents, revealing that the active species were mainly ·O₂⁻ and h⁺ and EPR, which significantly affected the degradation efficiency. The g-C 3 N 4 /MnIn 2 S 4 heterostructure achieved efficient separation of the photogenerated carriers, significantly enhancing its photocatalytic performance for RhB and tetracycline degradation. VB-XPS tests exhibited that the valence bands of MnIn 2 S 4 and g-C 3 N 4 were 1.25 and 2.25 eV, respectively. Combined with UV-vis DRS results, the calculated conduction bands are -0.79 and -0.53 eV, respectively. The study found that efficient separation between photogenerated holes and electrons in the heterostructure had a crucial impact on its photocatalytic performance.
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Sustainability
·
2024
·Vol. 16
·期 10
·4231
·
IF 3.3
Ke Ren,Fangjie Ding,Lijun Zhang,Fengping Peng,Jianzhong Guo,Chunzheng Wu
The food industry is responsible for generating considerable amounts of waste, such as excess fruits and leftover sugars, which contribute to resource depletion and pose environmental challenges. This research delves into the application of gold-modified graphitic carbon nitride nanosheets (Au/CN) as a potent catalyst for the transformation of these food wastes into H2via piezoelectric reforming during sonication. Au/CN demonstrated a superior rate of H2evolution compared to pristine g-C3N4(i.e., 1533.3 vs. 364.9 µmol/g/h) and it maintained its efficiency through multiple cycles of use. The catalytic activity was found to be optimal at a neutral pH level and with increased sugar concentrations. The enhanced catalytic performance of Au/CN was ascribed to the efficient segregation of charge carriers as well as the reduced charge transfer distance. This study underscores the viability of using Au/CN as a means for converting food wastes into a sustainable source of H2energy.
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Water
·
2024
·Vol. 16
·期 10
·1372
·
IF 3
Rong Liu,Mingming Li,Jie Chen,Yu Yin,Wei Zhao,Zhanghao Gong,Hua Jin,Zhigang Liu
Residual drug pollutants in water environments represent a severe risk to human health, so developing a cheap, environmentally friendly, and effective photocatalyst to deal with them has become a hot topic. Herein, a magnetically separable Fe3O4@TiO2/g-C3N4photocatalyst with a special heterojunction structure was fabricated, and its photocatalytic performance was assessed by degrading tetracycline (TC). Compared to Fe3O4@TiO2, the synthesized Fe3O4@TiO2/g-C3N4exhibited superior TC degradation performance, which was primarily ascribed to the heterojunction formed between TiO2and g-C3N4and its ability to enhance the visible light absorption capacity and reduce the photoinduced electron/hole recombination rate. Moreover, a free radical capture experiment further confirmed that ·O2−and h+are the predominant components in the TC degradation reaction. Under UV–Vis irradiation, the TC degradation rate escalated to as high as 98% within 120 min. Moreover, Fe3O4@TiO2/g-C3N4was demonstrated to be easily recovered by magnetic separation without any notable loss even after five cycles, showing exceptional stability and reusability. These findings indicate that Fe3O4@TiO2/g-C3N4is a promising photocatalyst for environmental remediation that may provide a sustainable approach to degrading antibiotic pollutants in wastewater.
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ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Bin Zhou,Qingsong Liu,Caihong Zheng,Yao Ge,Lili Huang,Haoyang Fu,Shengqiong Fang
For the efficient degradation of organic pollutants with the goal of reducing the water environment pollution, we employed an alkaline hydrothermal treatment on primeval g-C 3 N 4 to synthesize a hydroxyl-grafted g-C 3 N 4 (CN-0.5) material, from which we engineered a novel Fenton-like catalyst, known as Cu–CN-0.5. The introduction of numerous hydroxyl functional groups allowed the CN-0.5 substrate to stably fix active copper oxide particles through surface complexation, resulting in a low Cu leaching rate during a Cu–CN-0.5 Fenton-like process. A sequence of characterization techniques and theoretical calculations uncovered that interfacial complexation induced charge redistribution on the Cu–CN-0.5 surface. Specifically, some of the π electrons in the tris-s-triazine units were transferred to the copper oxide particles along the newly formed chemical bonds (C (π) -O-Cu), forming a π-deficient area on the tris-s-triazine plane near the complexation site. In a typical Cu–CN-0.5 Fenton-like process, a stable π-π interaction was established due to the favorable positive-negative match of electrostatic potential between the aromatic pollutants and π-deficient areas, leading to a significant improvement in Cu–CN-0.5's adsorption capacity for aromatic pollutants. Furthermore, pollutants also delivered electrons to the Cu–CN-0.5 Fenton-like system via a “through-space” approach, which suppressed the futile oxidation of H 2 O 2 in reducing the high-valent Cu 2+ and significantly improved the generation efficiency of • OH with high oxidative capacity. As expected, Cu–CN-0.5 not only exhibited an efficient Fenton degradation for several typical aromatic organic pollutants, but also demonstrated both a low metal leaching rate (0.12 mg/L) and a H 2 O 2 utilization rate exceeding 80%. The distinctive Fenton degradation mechanism substantiated the potential of the as-prepared material for effective wastewater treatment applications.
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高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Jun Han,Fangzhou Wu,Zhongwei wang,Yan Gao,Bin Dai,Wei Wang
The performance of the photocatalysts is influenced by factors such as electron generation ability, charge separation rate, and active sites distribution. In this study, needle-shaped precursors were prepared through low-temperature supramolecular self-assembly, and conical porous hollow carbon nitride (PHCN) was obtained after high-temperature pyrolysis. The PHCN not only possesses a thin-walled porous structure but also contains nitrogen defects embedded in its structure, which synergistically enhance the efficiency of photogenerated charge separation and provide more reactive sites. The DFT calculations showed that nitrogen defects and Pt-loading synergistically optimize the intermediate reaction process of graphitic carbon nitride (g-C 3 N 4 ). PHCN had excellent photocatalytic degradation of tetracycline hydrochloride (TCH) and Rhodamine B (Rh B). The photocatalytic hydrogen evolution rate of PHCN was 20.0 times higher than that of bulk g-C 3 N 4 (BCN). This study elucidated the relationship between crystallization rate and precursor morphology, as well as the influence of their physicochemical properties on photocatalytic performance. It also lays the foundation for constructing materials with nitrogen defects and special morphology through supramolecular self-assembly.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jing Liu,Huiyu Dong,Carmen Sans,Xiangjuan Yuan
In this study, a series of boron (B) and oxygen (O) dual doped g-C 3 N 4 (BOCNx) composites with different boric acid dopant dosages were successfully synthesized through one-step thermal condensation method. Amongst, BOCN50 exhibited the best catalytic ozonation activity, achieving 97 % of iopamidol (IPM) degradation within 15 min and the highest k value (0.3166 min −1 ), which was 8 times higher than that of ozonation alone. Multiple characteristic techniques were used to explore the surface properties of BOCNx catalysts and it was found that B and O primarily coordinated in g-C 3 N 4 as the forms of C-O, C = O and B-N bonds. Further investigation in the structure–activity relationship of BOCNx catalyst indicated that the increasing contents of oxygen-containing functional groups and B-N bonds were linearly correlated with the IPM degradation rate. The results of scavenger experiments and ESR analysis demonstrated that the main reactive oxygen species involved were hydroxyl radicals, superoxide radicals, and singlet oxygen ( • OH, • O 2 − and 1 O 2 ). Additionally, up to 12 intermediate products of IPM during the reaction were detected, and the corresponding degradation pathways were elucidated. Finally, the structure of BOCN and the active sites for O 3 adsorption were determined by density functional theory (DFT) calculation, thus providing theoretical support for studying the mechanism of catalytic ozonation degradation.
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JOURNAL OF CHEMICAL PHYSICS
·
2024
·Vol. 161
·期 11
·
IF 3.1
Ran Xunan,Chen Zhihua,Ji Hongzhou,Ma Zhaoyu,Xie Yuxi,Li Wenping,Zhang Junying
With advantages such as low cost, high stability, and ease of production, visible light photocatalytic C 3 N 4 with a unique microscopic layered structure holds significant potential for development. However, its hydrogen production efficiency remains low due to the pronounced recombination of photo-generated charge carriers and limited surface reaction sites. Normally, the photocatalytic performance of C 3 N 4 can be enhanced by loading noble metals with surface plasmon resonance. It is worth noting that the size of noble metal nanoparticles has a great influence on photocatalytic performance. In this study, accurate controlling of the size and distribution of Au nanoparticles was achieved on the surface of C 3 N 4 by introducing amino groups to improve photocatalytic performance. Results show that uniformly distributed Au nanoparticles in the range of 2–6 nm can be obtained on C 3 N 4 with a remarkable enhancement of hydrogen production efficiency, which is about 114 times the property of pure C 3 N 4 . The small-sized and uniformly distributed Au nanoparticles can provide more reaction sites and increase the separation of photo-generated charge carriers, in turn improving Au/NH 3 –C 3 N 4 photocatalytic hydrogen release rate to 6.85 mmol g −1 h −1 . This work offers a facile way to enhance photocatalytic performance by controlling the size of metal nanoparticles on C 3 N 4 precisely.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Chong Sun,Muhan Zhang,Qiqi Fei,Daoying Wang,Zhilan Sun,Zhiming Geng,Weimin Xu,Fang Liu
In this paper, a novel immunosensor was built for quantitative detection of heat shock protein 90 (HSP90) based on graphite-like carbon nitride nanosheets (g-C 3 N 4 NSs) hybridized with gold-F127 nanoparticles (g-C 3 N 4 -F127-Au NSs) modified electrode. The transmission electron microscope (TEM) was used to observe the structure and morphology of g-C 3 N 4 -F127-Au NSs. The successful preparation of g-C 3 N 4 -F127-Au NSs was characterized by UV–vis spectra, fourier transform infrared spectra (FTIR) and Raman spectra. Meanwhile, the electrochemical properties were measured by linear sweep voltammetric (LSV) and differential pulse voltammetry (DPV). Under the optimized conditions, the peak currents were linear with the concentration of HSP90 ranging from 3.5 μg/mL to 2.43 mg/mL. The linear regression equation was I (μA) = 10.31–10.05logc (R 2 = 0.9986, n = 9) with the detection limit of 2.67 μg/mL. Finally, the immunosensor exhibited good selectivity performance and provided a new approach for meat quality evaluation.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 34
·15149-15157
·
IF 2.7
Jinpu Zhang,Xiaoyu Wang,Ruihan Du,Siyang Sun,Shuyi Yu,Chunli Kang
Graphitic carbon nitride (gCN) has shown great potential in photocatalysis. Developing suitable cocatalysts is a critical way to enhance gCN's photocatalytic performance. In this paper cobalt–nickel bimetallic phosphide (CoNiP) was used as a cocatalyst to modify gCN. A gCN/CoNiP composite was successfully prepared by a simple hydrothermal method. XRD, XPS, SEM, UV-vis DRS, and PL characterization studies showed that a Schottky junction-like structure was constructed between gCN and CoNiP, which intensified the visible light response, enhanced the charge transfer rate and prohibited the recombination of photogenerated carriers, thus significantly improving gCN photocatalytic activity. Under simulated sunlight, the removal efficiency of methylene blue (10 mg L−1) was 97.8% by 120 min of irradiation, 44.6% higher than that of gCN. The quenching experiment showed that ˙O2−, ˙OH and h+ were the main active species. Based on the above points, the possible mechanism of photocatalysis was deduced.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Da Sheng,Qing He,Zhong-Hua Cao,Lun-Bo Chen,Song-Hai Wu,Yong Liu,Hai-Tao Ren,Xu Han
Although photooxidation of benzyl alcohol to benzaldehyde in aqueous solution is an important chemical process, its selectivity cannot be readily controlled due to the overoxidation of benzaldehyde. In this study, a series of Bi–Mo/CN photocatalysts are synthesized, and their reactivity in photooxidation of benzyl alcohol under visible light is compared. Bi–Mo/CN-2 exhibits high photocatalytic reactivity in the conversion of benzyl alcohol (51%) with a high selectivity toward benzaldehyde of 99.9%. In this process, the formed ≡Bi–OO• and ≡Bi–OOH selectively oxidize benzyl alcohol to benzaldehyde via the H-abstraction pathway after O2 is photoreduced on Bi–Mo/CN, accompanied by the formation of H2O2. Meanwhile, the doped Mo utilizes the produced H2O2 or ≡Bi–OOH to produce ≡Mo–O2 peroxo, which not only contributes to the selective oxidation of benzyl alcohol to benzaldehyde but also effectively prevents overoxidation of benzaldehyde. This work provides new insight into designing novel photocatalysts for selective oxidation of organic substrates.
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JOURNAL OF MATERIALS RESEARCH
·
2024
·
IF 2.7
Shen Wenting,Du Jiaxin,Mei Xiangyu,Liu Su,Liu Fujian,Si Yinsong
Graphitic carbon nitride (g-C 3 N 4 ), owing to its unique structure, has emerged as a hotspot in the semiconductor photocatalytic hydrogen production. However, the intrinsic poor crystallinity of g-C 3 N 4 , which leads to poor hydrogen production efficiency, remains a significant drawback. This study introduces a novel approach for synthesizing highly crystallized g-C 3 N 4 by optimizing precursor mass and employing a fixed temperature polymerization technique. Our research focuses on the intermediate stage polymerization at 220 °C using varying masses of dicyandiamide (DCY) precursors. The results indicate that an increase in the mass of the DCY precursor leads to g-C 3 N 4 with a more regular microstructure and enhanced crystallinity. The photocatalytic hydrogen production rate of this g-C 3 N 4 reached up to 3779 μmol·h −1 ·g −1 , which is five times that of the original g-C 3 N 4 .This research holds significant implications for improving the photocatalytic hydrogen production performance of intrinsic g-C 3 N 4 . Graphical abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yali Song,Ziyan Li,Cairong Yang,Xiaojing Zhang,Qiong Wang,Xiaoyu Wen,Hongzhong Zhang,Long Huang
A simple method for preparing C self-doped g-C 3 N 4 (CCN) was proposed by calcining urea and barbituric acid to effectively degrade sulfamethoxazole (SMX). X-ray photoelectron spectroscopy and element content analysis implied C atom replaced the original position of the bridging N atom to form CCN. Compared to g-C 3 N 4 , the absorption edge of CCN was red-shifted. As a result, the band gap of CCN was reduced, which improved the light absorption capacity of CCN and the separation efficiency of photogenerated electron-hole. Ultimately, the photocatalytic activity of CCN was finally boosted. CCN can effectively degrade SMX under visible light. Among CCN with various C dosage, when 0.05 g of barbituric acid was added in the preparation process, the obtained sample (CCN-0.05) exhibited uppermost degradation efficiency on SMX, which can reach 99.0 % after irradiation for 60 min. Additionally, the first-order kinetic reaction rate constant (0.086 min −1 ) was 8.9 times higher than that of g-C 3 N 4 (0.0097 min −1 ). Electron paramagnetic resonance and trapping experiments showed that the dominant reactive species on SMX degradation were surface ·O 2 − and photogenerated holes by CCN-0.05 under visible light. Moreover, CCN-0.05 can still achieve effective removal of SMX under actual water backgrounds and showed selective degradation on sulfonamides.
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