NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 32
·14522-14531
·
IF 3.591
Liruhua Zhang,Qianhong Shen,SuHua Zheng,LiXin Yu,Feilong Huang,Changteng Zhang,Jiansong Sheng,Hui Yang
A novel Z-scheme mixed-crystal Bi2O3/g-C3N4 composite photocatalyst was successfully prepared by a simple electrospinning–calcination approach. The micromorphology, configuration, chemical interaction and optical properties of the synthesized composite photocatalyst were analyzed and the photocatalytic degradation efficiency was estimated by the photodegradation of antibiotics. The results show that Bi2O3 nanofibers existing as α and β mixed-crystal phases are prepared and mixed with g-C3N4 nanosheets, thus forming a highly efficient α-Bi2O3/β-Bi2O3/g-C3N4 homoheterojunction. Transfer of the photogenerated electrons and holes in the fabricated α-Bi2O3/β-Bi2O3/g-C3N4 homoheterojunction follows a Z-scheme enhanced photocatalytic mechanism, resulting in the effective separation and transfer of photogenerated e− and h+. Moreover, the mixed-crystal Bi2O3/g-C3N4 photocatalyst has an enhanced visible-light absorbance. Therefore, the Bi2O3/g-C3N4 composite displays high photocatalytic properties for degrading tetracycline hydrochloride under 5 W LED visible-light irradiation, and the high photocatalytic activity is maintained even after 5 cycles, indicating the outstanding stability and reusability of the composite photocatalyst.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·Vol. 44
·期 3
·1586-1596
·
IF 4.229
Tianyu Zhao,Zipeng Xing,Ziyuan Xiu,Zhenzi Li,Shilin Yang,Qi Zhu,Wei Zhou
TiO 2-x /g-C 3 N 4 /CdS ternary heterojunctions are fabricated through thermal polymerization-chemical bath deposition combined with in-situ solid-state chemical reduction approach. The prepared materials are characterized by X-ray diffraction, Fourier transform infrared spectra , scanning electron microscopy, transmission electron microscopy , nitrogen adsorption-desorption, and X-ray photoelectron spectroscopy. The results show that the ternary heterojunctions are formed successfully and CdS quantum dots (QDs) and TiO 2 are anchored on surface of g-C 3 N 4 nanosheets simultaneously. The visible-light-driven photocatalytic degradation ratio of Bisphenol A and hydrogen production rate are up to 95% and ∼254.8 μmol h −1 , respectively, which are several times higher than that of pristine TiO 2 . The excellent visible-light-driven photocatalytic activity can be ascribed to the synergistic effect of TiO 2−x , g-C 3 N 4 and CdS QDs which extend the photoresponse to visible light region and favor the spatial separation of photogenerated charge carriers.
研究领域:
材料科学
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光催化
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纳米材料
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环境催化
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能源化学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2022
·Vol. 9
·期 9
·095001
·
IF 2.025
Wanshu Yan,Pingping Hu,Yiguo Jiang,Xiuquan Xu,Xianfeng Ma,Mengru Wang,Xinyue Bao
Photocatalytic inactivation has been proved to be an effective strategy to eliminate pathogenic bacteria in water. Herein, a novel 0D/2D p-n heterojunction of Ag2S-anchored P-doped g-C3N4 (Ag2S/PCN) were constructed by a simple two-step process coupling one-pot calcination and ultrasonic-assisted synthesis. The photocatalytic performance of as-prepared Ag2S/PCN composites was investigated by inactivating multidrug-resistant E. coli under visible light irradiation. The results indicated that Ag2S/PCN-5 possessed outstanding photocatalytic inactivation activity and superior stability, which could completely inactivate 7.0 log E. coli cells within 60 min. The enhanced photocatalytic activity of Ag2S/PCN-5 was mainly attributed to the elevated visible-light response and improved production and transfer of photoexcited charges. In addition, the free radicals trapping experiments results revealed that h+ and •O2− were predominantly responsible for the efficient inactivation activity. Finally, according to the 0D/2D structure and energy band configuration analysis, the enhanced p-n type heterojunction photocatalytic inactivation mechanism of Ag2S/PCN was discussed in detail.
研究领域:
环境科学
·
微生物学
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材料科学
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Zhang Yifeng,Liu Yixin,Li Rongxia,Saddam Khan Malik,Gao Picheng,Zhang Yong,Wei Qin
Herein, a novel label-free photoelectrochemical (PEC) immunosensor based on SnS 2 @mpg-C 3 N 4 nanocomposite is fabricated for the detection of prostate specific antigen (PSA) in human serum. Firstly, mesoporous graphite-like carbon nitride (mpg-C 3 N 4 ) with carboxyl groups is synthesized successfully which possesses high specific surface area and large pore volume. Then, SnS 2 as a typical n-type semiconductor with weak photoelectric conversion capability is successfully loaded on carboxylated mpg-C 3 N 4 to form a well-matched overlapping band-structure. The as-synthesized SnS 2 @mpg-C 3 N 4 nanocomposite performs outstanding photocurrent response under visible-light irradiation due to low recombination rate of photoexcited electron-hole pairs, which is transcend than pure SnS 2 or pure mpg-C 3 N 4 . It is worth noting that SnS 2 @mpg-C 3 N 4 nanocomposite is firstly employed as the photoactive material in PEC immunosensor area. The concentration of PSA can be analyzed by the decrease in photocurrent resulted from increased steric hindrance of the immunocomplex. Under the optimal conditions, the developed PEC immunosensor displays a liner photocurrent response in the range of 50 fg·mL −1 ~ 10 ng·mL −1 with a low detection limit of 21 fg·mL −1 . Furthermore, the fabricated immunosensor with satisfactory stability, reproducibility and selectivity provides a novel method for PSA determination in real sample analysis.
研究领域:
分析化学
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生物传感器
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纳米技术
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医学诊断
✓ 已验证
DOI
高影响因子
Biochar
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2022
·Vol. 4
·期 1
·1-19
·
IF 11.452
Han Yu,Gan Lu,Gong Han,Han Jiangang,Qiao Weichuan,Xu Lijie
Metal-free photocatalysts have attracted growing concern recently. Herein, the composites combining g-C 3 N 4 with wood pulp cellulose biochar (WPBC/g-C 3 N 4 ) were synthesized to effectively activate peroxymonosulfate (PMS) under visible light for the degradation of diclofenac (DCF). The incorporation of WPBC endowed g-C 3 N 4 with enhanced visible light absorption, improved charge separation capability, reduced electrical conductivity, and increased photocatalytic and PMS activation capability. Based on quenching tests, electron paramagnetic resonance (EPR), electrochemical analysis and solvent exchange experiments, both radical and nonradical mechanisms were proposed. Radical species including ·OH, h + , ·O 2 – were identified to contribute to DCF degradation. The 1 O 2 and electron transfer were the dominant nonradical pathways for DCF degradation. Moreover, the common influencing factors were examined, and DCF concentration was the most influential factor based on principal component analysis. Generally, the composites exhibited good reusability during consecutive runs. Based on HPLC/MS analysis, four intermediates were detected and the possible DCF degradation pathway was proposed. This work provided a potential strategy based on metal-free WPBC/g-C 3 N 4 for the photocatalytic activation of PMS to effectively degrade emerging contaminants in wastewater. Graphical abstract
研究领域:
环境科学
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光催化材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 8
·3573-3584
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IF 3.5
Xu Man,Luo Yongping,Zeng Linsheng,Huang Ping,Xu Shunjian,Liu Yike,Wang Yongya,Li Xianchang,xie Yu
In consideration of the increased activity of Pt-based catalysts for methanol oxidation in direct methanol fuel cells, it is necessary to apply an ideal support in the construction of Pt-based catalyst for methanol oxidation. In this study, Ag/g-C 3 N 4 nanosheets (Ag/GCNN) nanocomposites with different Ag contents were synthesized and used as the progressive support to construct Pt/Ag/GCNN catalyst. As a nitrogen-rich polymeric semiconductor, GCNN is easily coordinated with various metals. The introduction of Ag nanoparticles can improve the electrical conductivity of the catalyst and cooperate with Pt for optimizing the performance of electrocatalytic oxidation of methanol. The electrochemical experiment results demonstrated that Pt/Ag/GCNN has higher electrocatalytic activity and stability for methanol oxidation than Pt/GC and Pt/GCNN. The mass activity of Pt/Ag/GCNN-0.6 (18.66 mA mg Pt −1 ) is 7.07, 4.60 and 1.26 times that of Pt/GCNN (4.06 mA mg Pt −1 ), Pt/Ag/GCNN-0.4 (4.06 mA mg Pt −1 ) and Pt/Ag/GCNN-0.8 (14.76 mA mg Pt −1 ) at the forward peak potential. The J f / J b ratio of Pt/Ag/GCNN-0.6 is 3.31, which is bigger than that of Pt/GCCN (2.62), Pt/Ag/GCNN-0.4 (2.69), and Pt/Ag/GCNN-0.8 (2.56). A suitable mechanism was proposed to explain that Ag/GCNN supported Pt catalyst can improve the CO toxicity resistance and electrocatalytic performance. Based on the coordination of GCNN, Ag was first modified to form a support, and then the remaining coordination sites were used to support Pt. It provided a new strategy for the design of catalysts for methanol electrooxidation. Graphical abstract
研究领域:
材料科学
·
电化学
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催化
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纳米技术
·
能量转换
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xinyu Du,Xue Bai,Lu Xu,Lei Yang,Pengkang Jin
A novel TiO 2 /g-C 3 N 4 -PS system was proposed, in which a TiO 2 /g-C 3 N 4 heterojunction was used to activate persulfate (PS) to enhance pollutant photodegradation under visible-light irradiation. In this study, the TiO 2 /g-C 3 N 4 photocatalyst was synthesized by a simple calcination method, and acetaminophen (AAP) was chosen as a model pollutant to test the degradation efficiency of the photocatalytic system. The TiO 2 /g-C 3 N 4 -PS system exhibits an efficient activity for PS activation and a high efficiency for pollutant degradation . The results show that 100 mL of a 5 mg/L AAP solution could be almost completely degraded in 30 min with 0.5 g/L photocatalyst and 2 mM PS, and TOC can be decreased by 82.5% in 60 min. After adding PS, the degradation rate of the TiO 2 /g-C 3 N 4 photocatalytic system was greatly improved by nearly 13 times, compared to the TiO 2 /g-C 3 N 4 system. The radical quenching experiments and electron paramagnetic resonance (EPR) results indicate that SO 4 − , OH and h + all contribute to eliminating organic compounds. Additionally, the TiO 2 /g-C 3 N 4 -PS photocatalytic system was employed to eliminate other typical micropollutants, such as phenol , bisphenol A and carbamazepine, and experiments were also carried out using real water matrices, and the ideal performance shows that the TiO 2 /g-C 3 N 4 -PS photocatalytic system has a strong nonselective oxidative ability for degrading contaminants.
研究领域:
环境科学
·
化学
·
材料科学
·
水处理
✓ 已验证
DOI
高影响因子
NANO
·
2023
·
IF 1.2
Chen Wang,Lu Gan,Yuxuan Li,Shan Wang,Li Lu,Siyao Zhang,Wenrui Wang,Yan Chen
Graphite carbon nitride (g-C 3 N 4 ) polymer with two-dimensional planar structure is a new star in nanodrug delivery systems in recent years because it shows characteristics of low cost, nontoxicity, biocompatibility and easy functionalization. However, conventional g-C 3 N 4 shows bulk, macro size, small specific surface area and poor water solubility. To improve this, most works are always confined to physical ultrasound, oxidative peeling or template-strategy, which have the disadvantages of redundant steps, environment-unfriendliness and high cost. In this paper, a modified supramolecular self-assembled strategy was carried out to construct a novel graphitic carbon nitride nanoplatform (named by CA-MA X ) using melamine and cyanuric as precursors. The chemical structure characterization, drug loading experiment and cell tests in vitro of the CA-MA X nanoplatform were carried out and discussed in detail. Results indicated that the obtained samples show enhanced specific surface area, more exposed groups and good biocompatibility. Compared to the traditional carbon nitride (named by MA-CN), the newly prepared CA-MA X carrier shows improved drug loading efficiency and good pH-responsive loading, as well as releasing. Cell uptake experiment demonstrates that CA-MA 2 -DOX can be swallowed by cancer cells and during treatment of the cancer cell process, the CA-MA 2 -DOX complex experiences phagocytizing by the cancer cell, controlled-release DOX and kills the cancer cell after DOX was passively diffused into the nucleus. CA-MA 2 -DOX exhibited significant in vitro antitumor activity. To our knowledge, this is the first time the supramolecular self-assembled method was used in carbon nitride nanocarrier construction for cancer treatment.
研究领域:
纳米技术
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材料科学
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药学
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生物医学工程
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肿瘤学
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化学合成
✓ 已验证
DOI
高影响因子
Microsystems & Nanoengineering
·
2024
·Vol. 10
·期 1
·1-16
·
IF 7.3
Yang Shuo,Li Kaiyue,Huang Ping,Liu Keyan,Li Wenhui,Zhuo Yuquan,Yang Ziwen,Han Donglai
This study introduces a multifunctional device based on Cu 2 O/g-C 3 N 4 monitoring and purification p–n heterojunctions (MPHs), seamlessly integrating surface-enhanced Raman scattering (SERS) detection with photocatalytic degradation capabilities. The SERS and photocatalytic performances of the Cu 2 O in various morphologies, g-C 3 N 4 nanosheets (NSs) and Cu 2 O/g-C 3 N 4 MPHs with different g-C 3 N 4 mass ratios were systematically evaluated, with a particular emphasis on the Cu 2 O/g-C 3 N 4 -0.2 MPH, where g-C 3 N 4 constituted 20% of the total mass. Multiple optical and electrochemical tests revealed that the Cu 2 O/g-C 3 N 4 -0.2 MPH effectively enhances charge separation and reduces charge transfer resistance. The Cu 2 O/g-C 3 N 4 -0.2 SERS sensor exhibited a relative standard deviation (RSD) below 15% and achieved an enhancement factor (EF) of 2.43 × 10 6 for 4-ATP detection, demonstrating its high sensitivity and consistency. Additionally, it demonstrated a 98.3% degradation efficiency for methyl orange (MO) under visible light within 90 min. Remarkably, even after 216 days, its photocatalytic efficiency remained at 93.7%, and it retained an 84.0% efficiency after four cycles. XRD and SEM analyses before and after cycling, as well as after 216 days, confirmed the structural and morphological stability of the composite, demonstrating its cyclic and long-term stability. The excellent performance of the Cu 2 O/g-C 3 N 4 MPH is attributed to its Z-type mechanism, as verified by radical trapping experiments. The evaluation of the self-cleaning performance of the Cu 2 O/g-C 3 N 4 -0.2 SERS sensor demonstrated that its Z-scheme structure not only provides excellent self-cleaning capability but also enables the detection of both individual and mixed pollutants, while significantly enhancing the SERS signal response through an effective charge transfer enhancement mechanism.
研究领域:
材料科学
·
环境科学
·
分析化学
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光催化
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纳米技术
·
传感器技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Pin Chen,Siyuan Di,Xiaoqing Qiu,Shukui Zhu
In order to achieve excellent visible light photoactivity of TiO 2 , it is still urgently required to extend their optical absorption ability and improve the potential of charge separation and migration. Here we synthesized highly efficient visible-light-active catalysts F-TiO 2 /g-C 3 N 4 via a one-step-calcination method. Due to the synergic effect of ≡Ti−F, ≡Ti:F−H and the heterojunction, the obtained catalysts possess promising properties as highly efficient separation and migration of photoelectron-hole pairs. The prepared F-TiO 2 /g-C 3 N 4 heterojunction can be successfully applied to degrade the widely used flame retardants and antibiotics. More than 95% of tetrabromobisphenol A (TBBPA) was decomposed after light illumination for 120 min, and 98% of sulfamethazine (SMZ) was degraded for 60 min by F-TiO 2 /g-C 3 N 4 . Furthermore, a reasonable catalytic mechanism for the F-TiO 2 /g-C 3 N 4 catalysts was proposed. It could be seen that the active species •O 2 − , •OH, and h + played important roles in the photocatalytic process under visible light illumination.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Jiaying Li,Xiang Yu,Yi Zhu,Xionghui Fu,Yuanming Zhang
A novel 3D-2D-3D BiOI/porous g-C 3 N 4 /graphene hydrogel (BPG) composite photocatalyst was synthesized via a two-step hydrothermal method and shows a synergy of adsorption and photocatalysis . In comparison with bulk g-C 3 N 4 , 2D porous g-C 3 N 4 (pCN) exhibited not only shortened diffusion distance for photogenerated carrier transport but also large contact area for rapid interfacial charge separation. Nevertheless, the photocatalytic performance was far from satisfactory due to the poor light harvesting. Incorporating 3D flower-like BiOI with 2D pCN to form a heterojunction was found to be an efficiency way for improving light harvesting, while charge separation efficiency was also enhanced. 3D graphene hydrogel, in which the effective photocatalyst 3D-2D BiOI/pCN heterojunction was homogenously distributed, not only revealed excellent adsorption capability and bulk electron transfer but also provided simplicity of separation and recovery. Consequently, in static system, the degradation efficiency of methylene blue (MB) and the typical antibiotic levofloxacin hydrochloride (LVF) was 7.2 and 2.7 times as high as that for BiOI. In flow system, the pollutants could be constantly degraded without separation with the removal rates about 1.54 and 1.67 times higher than those of BiOI, which kept unchanged for 30 h. The construction of 3D-2D-3D BPG composite combined the excellent adsorption capacity of GH with the photocatalytic activity of BiOI/pCN heterojunction, resulting in a high removal efficiency towards pollutants. This work provided deep insight into design and fabrication of 3D hydrogel composites with excellent synergy of adsorption and photocatalytic properties.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 22
·7316-7325
·
IF 6.119
Chao Zhang,Hailian Bao,Xiaodi Chen,Xingliang Liu,Shiai Xu
Three typical arylamine organic dyes were covalently grafted onto g-C3N4 to form the resulting composites g-C3N4/TPA-CNCHO, g-C3N4/EtPTZ-CNCHO and g-C3N4/EtCz-CNCHO. They were synthesized by 1,3-dipolar cycloaddition with (E)-3-(4-(diphenylamino)phenyl)-2-formylacrylonitrile (TPA-CNCHO), (E)-3-(10-ethyl-10H-phenothiazine-3-yl)-2-formylacrylonitrile (EtPTZ-CNCHO), or (E)-3-(9-ethyl-9H-carbazol-3-yl)-2-formylacrylonitrile (EtCz-CNCHO) dyes. The experimental results show that arylamine organic dye moieties were successfully attached to g-C3N4, and this attachment can efficiently extend the light absorption area of pure g-C3N4 from approximately 460 nm to more than 650 nm. The obtained g-C3N4/TPA-CNCHO, g-C3N4/EtPTZ-CNCHO and g-C3N4/EtCz-CNCHO samples showed enhanced H2 evolution activity with photocatalytic H2 production rates that were approximately 105-, 93- and 67-fold that of pure g-C3N4. By combining the comprehensive analysis from experiments and density functional theory (DFT) calculations, a possible mechanism can be drawn: the introduced arylamine organic dye fragments attached to the surface of the g-C3N4 may acquire more light irradiation, and effective photoexcited carrier transfer from the donor dye fragments to the acceptor g-C3N4 could be achieved through the IFCT process. The results confirm that the covalent azomethine ylide bonds formed via 1,3-dipolar cycloaddition between the g-C3N4 and organic dye can truly enhance the photocatalytic H2 evolution rate of the obtained samples. It is believed that this kind of modification can be an effective strategy for achieving other kinds of functional organic dyes grafted onto g-C3N4 with highly efficient photocatalytic H2 activity.
研究领域:
材料科学
·
化学
·
光催化
·
能源材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）