Surfaces and Interfaces
·
2023
·
IF 6.2
Yijun Wang,Meijuan Ding,Ziyu Li,Mei Li
To facilitate the realize high-value utilization of coal tar pitch, carbon quantum dots (CQDs) were synthesized using ball-milling-assisted H₂O₂ oxidation method with tar pitch as carbon source. Subsequently, Ag₃PO₄/g-C₃N₄/CQDs composites were prepared through the electrostatic self-attraction of CQDs, Ag₃PO₄ and g-C₃N₄. These composites were then employed for the photocatalytic degradation of dyes, including methyl orange (MO), methylene blue (MB) and rhodamine B (RhB). A case study of MO, the degradation rate constant of Ag₃PO₄/g-C₃N₄/CQDs reached 0.02469 min −1 , which was 11 times and 1.6 times higher than that of g-C₃N₄ and Ag₃PO₄. It found that Ag₃PO₄:g-C₃N₄ mass ratio of 1:1 and 5 mg/L CQDs solution loading were optimal. Characterization analysis revealed the specific surface area of the catalyst was increased and optimized band gap structure after the combination of CQDs as the co-catalyst. The possible reaction mechanism was also expounded, Ag₃PO₄/g-C₃N₄/CQDs constructed Z-scheme heterostructure, with CQDs as electron bridge. In addition, the impact of catalyst mass, initial concentration, and pH on the degradation process was studied, as well as the cyclic stability of the catalyst. Based on capture and ESR tests, the main active substances involved in the reaction were in the following order: h + > ·OH > ·O 2 − . These experiments provided a new idea on the application of coal-based CQDs in the field of visible light catalytic degradation.
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2023
·Vol. 4
·期 22
·5585-5593
·
IF 5
Tinglei Wang,Jiayu Xin,Zhen Li,Yong Fan,Yu Wang
Synthesizing highly effective photocatalysts for hydrogen peroxide (H2O2) generation is still a challenge. In this work, the doping of graphite carbon nitride nanosheets with single-atom titanium, using TiCl3 as a precursor, to form single Ti atom-doped graphitic carbon nitride (Ti-SAC/g-C3N4) photocatalysts can efficiently address this challenge. The photocatalytic activity is enhanced by increasing the concentration of titanium to 0.09%, and subsequently decreases with further increases in the concentration of titanium, thus confirming that the concentration of titanium atoms can modulate the performance of the single-atom catalysts. Furthermore, an in-depth investigation indicates that the bottom of the conduction band (CB) and the maximum of the valence band (VB) can be controlled by varying the concentration of titanium atoms. A high bottom of the CB is beneficial to increase the photocatalytic efficiency. Under acidic conditions and utilizing sacrificial agents, the H2O2 production rate of Ti-C3N4-100 can reach 356.45 μmol L−1 h−1 and is 2.44 and 2.13 times higher than that of BCN and g-C3N4, respectively. The electron spin resonance (ESR) spectra suggest that the generation of superoxide radicals is crucial in the photocatalytic process. This work provides a distinctive strategy to realize single titanium atom doping and offers new insights into structure–property relationships.
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 14
·5563
·
IF 4.6
Yayang Wang,Ziyi Liu,Yuesheng Li,Xiaojie Yang,Lingfei Zhao,Jian Peng
The development of a stable and highly active photocatalyst has garnered significant attention in the field of wastewater treatment. In this study, a novel technique involving a facile stirring method was devised to fabricate an array of g-C3N4/ZnO nanowire (ZnO NW) composites. Through the introduction of g-C3N4to augment the generation of electron-hole pairs upon exposure to light, the catalytic efficacy of these composites was found to surpass that of the pristine ZnO NWs when subjected to simulated sunlight. The photocatalytic performance of a 20 mg·L−1methylene blue solution was found to be highest when the doping rate was 25 wt%, resulting in a degradation rate of 99.1% after 60 min. The remarkable enhancement in catalytic efficiency can be ascribed to the emergence of a captivating hetero-junction at the interface of g-C3N4and ZnO NWs, characterized by a harmoniously aligned band structure. This alluring arrangement effectively curtailed charge carrier recombination, amplified light absorption, and augmented the distinct surface area, culminating in a notable boost to the photocatalytic prowess. These findings suggest that the strategic engineering of g-C3N4/ZnO NW heterostructures holds tremendous promise as a pioneering avenue for enhancing the efficacy of wastewater treatment methodologies.Keywords:g-C3N4;ZnO NW;heterostructure;photodegradation
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 41
·94112-94125
·
IF 5.8
Zhang Mingyuan,Li Yueyao,Zhou Xiaoying,Wang Liping,Xie Yuke,Hou Chentao
In recent years, wastewater treatment to remove tetracycline hydrochloride (TCH) has received much attention in water treatment problems. ZIF-67/C 3 N 4 composite adsorbent, a nanosheet structured material stacked with MOFs, was prepared by in situ growth method, which has high adsorption activity for tetracycline hydrochloride in wastewater. Comparing the effect of monomeric and composite adsorbents, Z 6 C 2 had the best adsorption effect (206 mg·g −1 ), which was 77.6% higher than that of ZIF-67 (116 mg·g −1 ) and 10.8 times higher than that of C 3 N 4 (19 mg·g −1 ). The structure of ZIF-67 stacked on C 3 N 4 nanosheets has an excellent specific surface area and number of active sites, as well as π-π interactions, electrostatic interactions, and hydrogen bonding interactions between the adsorbent and TCH, which combine to enhance the adsorption performance. The adsorption process is accompanied by a combination of chemisorption, mass transport, and internal diffusion rate-limiting. It was shown that the adsorption process is favorable for monolayer adsorption as well as a heat absorption reaction that proceeds spontaneously. The adsorbent exhibits good stability and adsorption capacity, which may be suitable for efficient and low-cost water purification.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Wan-Ting Lin,Cheng-Ye Zhu,Di Zhou,Wan-Long Li,Ping Fu,Xiao-Jun Huang,Zhi-Kang Xu,Ling-Shu Wan
Thin film nanocomposite membrane with a nanomaterial interlayer (TFNi) has attracted extensive attention in recent years. Herein, for the first time, tannic acid (TA) functionalized g-C 3 N 4 nanosheets are used to construct an interlayer for the fabrication of TFNi nanofiltration membranes with enhanced separation performance. The TA-C 3 N 4 nanosheet interlayers possess high hydrophilicity, low resistance for water transport, and strong structural stability, which is conducive to improving water permeance of the TFNi membranes. Meanwhile, the uniformity of interfacial polymerization on the interlayers is improved by virtue of the smooth surface of the interlayer, enabling the formation of an integral and dense polyamide layer with a thickness of only about 10 nm. The TFNi membranes exhibit excellent performance with water permeance of 34.25 L m −2 h −1 bar −1 and Na 2 SO 4 rejection of 98.53%, which are obviously higher than those of the corresponding membrane without TA-C 3 N 4 nanosheets (21.03 L m −2 h −1 bar −1 and 92.04%). The TFNi membranes also show significant selectivity improvement toward divalent/monovalent ions. This work gives inspiration for designing advanced nanofiltration membranes with functionalized nanomaterials acting as interlayers.
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 10
·3879
·
IF 3.4
Yelin Dai,Ziyi Feng,Kang Zhong,Jianfeng Tian,Guanyu Wu,Qing Liu,Zhaolong Wang,Yingjie Hua,Jinyuan Liu,Hui Xu,Xingwang Zhu
Water pollution is a significant social issue that endangers human health. The technology for the photocatalytic degradation of organic pollutants in water can directly utilize solar energy and has a promising future. A novel Co3O4/g-C3N4type-II heterojunction material was prepared by hydrothermal and calcination strategies and used for the economical photocatalytic degradation of rhodamine B (RhB) in water. Benefitting the development of type-II heterojunction structure, the separation and transfer of photogenerated electrons and holes in 5% Co3O4/g-C3N4photocatalyst was accelerated, leading to a degradation rate 5.8 times higher than that of pure g-C3N4. The radical capturing experiments and ESR spectra indicated that the main active species are •O2−and h+. This work will provide possible routes for exploring catalysts with potential for photocatalytic applications.Keywords:photocatalyst;type-II heterojunction;carrier separation;photodegradation
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 8
·1-12
·
IF 2.8
Yan Xin,Xie Ming,Pan Liangfeng,Ai Tao,Li Zhuo,Niu Yanhui
The recombination of charge carriers in photocatalysts is one of the main factors restricting photocatalytic performance. In this paper, the NaNbO 3 /g-C 3 N 4 heterojunction photocatalyst was prepared by a simple ultrasonic mixing approach and applied to obtain superior piezo-photocatalytic activity. The results showed that the NaNbO 3 nanowires were attached to the g-C 3 N 4 surface for efficient degradation of rhodamine B (RhB). Through the synergistic action of visible-light irradiation and ultrasonic vibration, the RhB solution could be degraded within 30 min by 5% NaNbO 3 /g-C 3 N 4 heterojunction. The reaction rate constant ( k ) of 5% NaNbO 3 /g-C 3 N 4 heterojunction is 2.7 times that of pure g-C 3 N 4 . Moreover, quenching tests and electronic spin resonance (ESR) indicated that ·O 2 − was the primary active species for RhB degradation. The enhanced photocatalytic performance was attributed to the formation of the heterojunction at the NaNbO 3 /g-C 3 N 4 interface. Furthermore, the piezoelectric field that originated from the bending deformation of NaNbO 3 nanowires effectively promoted charge carriers separation efficiency in the NaNbO 3 /g-C 3 N 4 heterojunction.
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 3
·655
·
IF 3.4
Yuxin Bai,Shasha Xu,Jing Chen,Xun Sun,Shan Zhao,Jingcai Chang,Zuoli He
Ternary heterojunction photocatalysts can improve the transport and separation of photogenerated electrons and holes, which could promote their reduction and oxidation properties for environmental and energy applications. In this research, the ternary photocatalyst Ti3C2@TiO2/g-C3N4was successfully synthesized via direct electrostatic self-assembly during hydrothermal process. Ti3C2MXene was used to optimize the interfacial carrier transport and separation between the interfaces. The obtained ternary heterostructured photocatalyst had a higher photocatalytic degradation performance for removing rhodamine B (RhB) and 4-chlorophenol (4-CP). The synergistic effect of heterojunction between g-C3N4and TiO2and Schottky barrier presented among TiO2and Ti3C2suppressed the recombination of the photogenerated electron–hole pairs. Moreover, the Ti3C2can serve as an active site for the adsorption and activation of organic pollutants resulting from sufficient functional groups (F−here).Keywords:Ti3C2;g-C3N4;heterojunction;photocatalyst;4-chlorophenol
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yan Jiang,Feiqiang Qu,Lin Tian,Xiaofei Yang,Zhaoyong Zou,Zixia Lin
The solar-to‑hydrogen conversion via semiconductor-based photocatalytic water splitting has triggered the search for cost-effective, high-performance photocatalytic materials. Graphitic carbon nitride (g-C 3 N 4 ) has proven to be a promising metal-free photocatalyst for the hydrogen evolution reaction (HER), however, bulk g-C 3 N 4 suffers from limited HER efficiency owing to its disadvantages including fast electron-hole recombination, low conductivity and irregular microstructure. Herein, we report a supramolecular chemistry-based approach to construct g-C 3 N 4 nano-architectures by calcining the pre-organized complexes originating from the copolymerization of two symmetrical precursors, melamine and trithiocyanuric acid. The resultant g-C 3 N 4 micro-/nanostructures not only effectively induce enhanced visible light-harvesting property but also accelerate the electron-hole separation and charge carrier transfer, leading to highly improved HER performance. X-ray photoelectron spectroscopy (XPS) analysis confirms the chemical environment of different elements, while in-situ electron paramagnetic resonance (EPR) characterizations reveal the types of oxygen-containing radicals and charge carrier dynamics. Compared to pristine g-C 3 N 4 , the optimal large-aspect-ratio g-C 3 N 4 sheets derived from ethanol show the fastest HER rate of 1144 μmol·h −1 ·g −1 . The improvement of photocatalytic activity can be ascribed to synergistic effects of extended visible light absorption, boosted charge transfer and more active catalytic sites for HER in modified g-C 3 N 4 materials.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 17
·6683-6687
·
IF 3.069
Xiaohui Sun,Xianghui An,Sa Zhang,Zhongtao Li,Jing Zhang,Wenting Wu,Mingbo Wu
Modified g-C3N4 sheets (CNS) with a bandgap of 2.61 eV were fabricated through physical vapor deposition (PVD) of g-C3N4. During the PVD process, a series of gaseous derivatives derived from pristine g-C3N4 at 700 °C condense into CNS at low temperature (<400 °C). As a result, CNS still retains a typical semiconductor structure (bandgap of 2.61 eV), while at the same time, CN and O–H defect groups were introduced to its tri-s-triazine-based structure.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Yong Zhang,Hongyu Jing,Tao Wen,Yao Wang,Yang Zhao,Xiangke Wang,Xiaohong Qian,Wantao Ying
It is challenging to capture N-glycopeptides with high recovery and high specificity from complicated biosystems. Herein, we present a facile and economical procedure to generate a novel self-assembling 4-Mercaptobenzene boronic acid functionalized and Au-doped Straticulate C 3 N 4 (MASC), with enhanced affinity capability towards glycopeptides . The materials possess low pH value adaptation, high hydrophilicity and stability, good repeatability and recyclability, and provided high selectivity (1:100), low limit of detection (0.33 fmol/μL), high enrichment efficiency (~ 80%) and high recovery rate (~ 90%) towards glycopeptides. The materials can capture glycopeptides unbiasedly, as demonstrated by the identification of 37 glycopeptides from IgG and 21 glycopeptides from horseradish peroxidase (HRP). The performance of MASC on human urine and serum glycoproteome analysis was also tested. An average of 1465 glycopeptides from 839 glycoproteins and 1553 glycopeptides from 884 glycoproteins were identified from female and male urine samples in a single mass spectrometry analysis. O -glycopeptides from human urine were also significantly enriched. Additionally, 463 glycopeptides assigned to 209 glycoproteins were identified from 5 μL of human serum. All of these results indicate that MASC presents a good performance and applicability in the field of glycoproteomic research.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Jiabai Cai,Xueqing Wu,Yuehai Li,Ye Lin,Hui Yang,Shunxing Li
The goal of this work was to assess the performance of Pt nanoparticles (NPs) as co-catalysts on the photocatalytic activity of TiO 2 @Pt@C 3 N 4 hollow spheres, which was tested by photodegrading rhodamine B and methyl blue under visible light irradiation. TiO 2 @Pt@C 3 N 4 composites were fabricated by using modified polystyrene balls as templates, hydrothermal reactions , and calcination . Under simulated sunlight irradiation, photocatalytic activity was in the following of TiO 2 @Pt@C 3 N 4 > TiO 2 @C 3 N 4 > C 3 N 4 > P25. The photo-conversion rate of the TiO 2 @Pt@C 3 N 4 increased significantly relative to TiO 2 @C 3 N 4 and the others. The combination of TiO 2 and C 3 N 4 , as well as the sandwiched of Pt NPs reduce electron-hole recombination as a result of having an electron trap site, which can store and shuttle photo-generated electrons, and enhance photo-generation of active radicals. Electron paramagnetic resonance (EPR) spectroscopy, as well as photo-luminescence (PL), and electrochemical measurements were taken to verify this conclusion. Considering the multi-functional combination of precious metals and semiconductor materials , this work may provide new ideas for the design of high-performance catalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）