SENSORS AND ACTUATORS B-CHEMICAL
·
2017
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IF 5.401
Haiyan Wang,Pei Liu,Wenjing Jiang,Xue Li,Huanshun Yin,Shiyun Ai
DNA methylation is one of the important epigenetics events, and it is responsible for transcription, genomic imprinting and cellular differentiation. Aberrant DNA methylation is always contacted with various diseases. Herein, a simple and low-cost photoelectrochemical (PEC) biosensing method is proposed for detection of DNA methylation, assay of DNA methyltransferase (MTase) activity and screening of MTase inhibitor, which is based on M. SssI MTase- HpaII endonuclease system. The graphite-like C 3 N 4 (g-C 3 N 4 ) and CdS quantum dots (CdS QDs) are used as photoactive materials. After the double-stranded DNA (dsDNA) was treated with M. SssI MTase in the presence of S -adenosylmethionine, the methylated dsDNA cannot be digested by HpaII endonuclease and dithiol group at the terminal of dsDNA can be retained. As a result, CdS QDs could be coupled successfully with methylated dsDNA between the reaction of CdS QDs with dithiol of dsDNA, achieving the amplification of PEC response. Thus, the photocurrent of PEC biosensor is consistent with the M. SssI activity. The increased photocurrent was in proportion to M. SssI activity in the linear range from 1 to 80 U/mL with a detection limit of 0.316 U/mL. Furthermore, the effects of atrazine and azamethipos on M. SssI MTase activity were investigated, which might provide useful information on carcinogenic mechanism of pesticide. The PEC biosensor has potential to screen of DNA MTase inhibitor, providing valuable information for anti-cancer drug research and also for cancer therapy.
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Green Energy & Environment
·
2025
·
IF 14.6
Jinshan Chen,Jiangfeng Lu,Ran Lang,Chi Wang,Shuangyou Bao,Yuan Li,Kai Li,Maohong Fan
In this study, a novel Pt-loaded CuPc/g-C 3 N 4 (PtCuCN) composite was synthesized for the selective photocatalytic reduction of CO 2 to CH 4 under visible light. The PtCuCN catalyst achieved a CH 4 yield of 39.8 μmol g⁻ 1 h⁻ 1 , significantly outperforming bulk g-C₃N₄ and CuPc alone by factors of 2.5 and 3.1, respectively, with a high selectivity of 90%. In comparison with other commonly studied photocatalysts, such as g-C 3 N 4 -based catalysts, the PtCuCN composite exhibited superior CH 4 yield and product selectivity, demonstrating its potential as a more efficient photocatalyst for CO₂ reduction. X-ray photoelectron spectroscopy (XPS), density functional theory (DFT) calculations, and in-situ infrared (IR) analysis revealed that the Pt⁰ species effectively lower the activation energy for CH 4 formation, while CuPc extends the light absorption range and enhances charge separation. The combined effects of these components in a Z-scheme heterojunction provide new insights into designing highly selective CO 2 -to-CH 4 photocatalysts. This work demonstrates the potential of PtCuCN as a highly efficient and stable catalyst for CO 2 reduction to CH 4 under visible light.
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Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Decai Yang,Qing Ye,Chao Qu,Fanwei Meng,Lanyang Wang,Yongqi Li
In the quest to enhance photocatalytic performance, structural regulation and interface engineering stand out as effective strategies for amplifying active sites and fostering the separation of photogenerated electron-hole pairs. In this study, a pioneering approach was employed, utilizing a straightforward two-step calcination method to prepare a novel photocatalyst : porous graphite carbon nitride (g-C 3 N 4 , CN) nanosheets (NS) loaded with mesoporous cerium oxide (CeO 2 /CNNS). The distinctive architecture of CeO 2 /CNNS not only elevates the specific surface area and catalytic active sites but also facilitates efficient mass transfer. Experimental results and density functional theory (DFT) calculations corroborate the existence of an internal electric field (IEF) within the Z-scheme heterojunction formed by uniformly dispersed CeO 2 and CNNS. This IEF proves pivotal in promoting charge separation and migration, thereby maintaining robust redox capabilities. Under visible light irradiation, CeO 2 /CNNS demonstrates an impressive 4.2-fold increase in the hydrogen production rate compared to bulk g-C 3 N 4 (BCN), coupled with a 48.5% boost in the photocatalytic degradation rate constant (k) of tetracycline (TC). This study not only unveils the innovative design of CeO 2 /CNNS but also paves the way for a fresh perspective on the design and preparation of multifunctional photocatalysts.
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Journal of Cleaner Production
·
2024
·
IF 9.7
Junfei Liu,Yingbo Dong,Yue Zhang,Wei Liu,Jian Xu,Hai Lin
The toxicity of antibiotic and heavy metal combined pollutants is greater than single antibiotic, achieving its synergistic removal is the key. In this work, a novel g-C 3 N 4 /MoS 2 photocatalyst with hollow structure (CN/MS-V-3) was fabricated by one-step solvothermal method . As expected, CN/MS-V-3 showed an outstanding removal efficiency for tetracycline and Cu 2+ of 98.49% and 99.90%, respectively. The excellent photocatalytic degradation performance for tetracycline in compound wastewater mainly ascribed to the enhanced visible-light capture ability by hollow structure of CN/MS-V-3, formation 1 O 2 and ·OH, and the cycle of Cu 2+ /Cu + and Mo 2+ /Mo 4+ induced the fast electrons transport . The contamination of Cu 2+ in wastewater can play as an accelerator in the CN/MS-V-3 reaction system to improve the degradation performance of tetracycline. DFT results indicated that CN/MS-V-3 heterojunction was formed by combination of side surface MoS 2 –V and g-C 3 N 4 , and the Cu adsorption onto CN/MS-V-3 showed a potential formation of Cu–N and Cu–S bonds. In addition, the tetracycline degradation pathways and evaluation of toxicity of intermediates were also proposed. This work not only provides a promising technology for antibiotic and heavy metal combined contamination removal, but also a clever use of Cu variable valence to accelerate electron cycling to improve the removal performance of the CN/MS-V-3.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yu Huang,Xinyang Xu,Guangjian Fan,Xiaoxuan Zhu,Lin Zhu,Xi Chen
The effect of TiO 2 crystal phase on the photocatalytic properties of TiO 2 /g-C 3 N 4 heterojunction photocatalyst under sunlight irradiation was investigated through experiments and theoretical calculations. Results reveal that for TiO 2 /g-C 3 N 4 heterojunction photocatalyst, anatase phase TiO 2 can adjust the band edge positions to ensure the generation of strongly oxidizing radical species (·O 2- and ·OH), and rutile phase TiO 2 can effectively reduce the band gap to more efficiently utilize sunlight. Consequently, the combination of g-C 3 N 4 with P25 TiO 2 composed of both anatase and rutile phases is the most favorable combination for sunlight-driven photocatalyst among the obtained three TiO 2 /g-C 3 N 4 heterojunction photocatalyst. P25 TiO 2 and g-C 3 N 4 form a type-II/type-II heterostructure with stepped heterojunction and concave heterojunction. The P/CN photocatalyst exhibits excellent photocatalytic activity with degradation efficiencies for naphthalene reaching 100% within 120 min of sunlight irradiation, as well as considerable stability. The combination of P25 TiO 2 and g-C 3 N 4 has shown significant potentials in improving the separation and transfer efficiency of photogenerated electron-hole pairs, as well as enhancing the utilization of sunlight in photocatalytic process. This work provides a promising strategy for the preparation of highly active TiO 2 /g-C 3 N 4 heterojunction photocatalyst for the effective treatment of naphthalene from water.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Xinfei Zhang,Jianhui Zhan,Xiaobo Jia,Jinxing Ma,Bin Han,Zhiliang Wang,Feilong Li,Yitong Wang,Yuan Zhang
In contrast to traditional metal oxides that engage in only two valence state conversions, multivalent metal oxides offer additional electrons, thus accelerating the activation of peroxymonosulfate (PMS) and enhancing catalytic activity. However, the low efficiency of converting between high-valent and low-valent metal ions often limits catalytic performance. In this study, we employed a combined hydrothermal and thermal polymerization strategy to load multivalent vanadium pentoxide (V 2 O 5 ) onto graphitic carbon nitride (g-C 3 N 4 ), thereby constructing a V 2 O 5 /g-C 3 N 4 heterojunction. This heterojunction formed a built-in electric field, facilitating PMS activation and achieving a record-breaking degradation of chloramphenicol (CAP) with a rate constant of 1.13 min −1 . Experimental and theoretical analyses indicated that the synergy between radical and non-radical pathways was the primary mechanism for efficient CAP removal. The built-in electric field altered orbital occupancy, reduced the bandgap, and enhanced electron transfer from g-C 3 N 4 to V 2 O 5 , accelerating the conversion between vanadium valence states and enhancing PMS activation. Furthermore, the V 2 O 5 /g-C 3 N 4 /PMS system exhibited a broad operational pH range (2–10), robust resistance to matrix interference, and exceptional durability, demonstrating its applicability for mitigating ecological toxicity of CAP and treating typical refractory organic pollutants. This study advances the understanding of how built-in electric fields promote PMS activation and introduces a novel approach for addressing emerging pollutants in aquatic environments.
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GREEN CHEMISTRY
·
2024
·Vol. 26
·期 4
·2290-2299
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IF 9.3
Peng Bai,Yicheng Zhao,Yongdan Li
Conventional photocatalytic CO2 reduction is usually combined with the oxidation of H2O or sacrificial agents, which faces problems such as low catalytic activity and inefficient atom economy. In this work, a photocatalytic CO2 reduction and selective styrene oxidation synergetic system is developed with an NH4Cl-modified g-C3N4/BiOBr composite photocatalyst. The interfacial heterostructure promotes the formation of surface amino groups and oxygen vacancies, which facilitates the adsorption and chemical reduction of CO2. The heterostructure also improves the separation of photogenerated electron–hole pairs and enhances the photocatalytic activity. The simultaneous consumption of electrons and holes is beneficial for both CO2 reduction and styrene oxidation processes. Meanwhile, the oxygen atoms removed during CO2 reduction are utilized efficiently for styrene oxidation in this synergistic system, and thus the atom economy is improved significantly. The generation rates of CO, CH4, benzaldehyde and styrene oxide are 802, 8, 684 and 139 μmol g−1 h−1, respectively. This study provides a novel strategy for designing a green photocatalytic CO2 reduction system.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Lina Wang,Hanpei Yang,Qiangshun Wu,Rui Ma
Photocatalysis-self-Fenton system, integrating photocatalysis with Fenton technology, emerge as promising approaches for environmental remediation. In this study, we introduced K, Na doped g-C 3 N 4 /FeOCl (DCN/FeOCl) catalyst, where amino groups on the DCN surface interacted with unsaturated Fe on FeOCl, forming Fe–N bonds and a Z-scheme heterojunction . The resulting DCN/FeOCl demonstrated efficient H 2 O 2 production and rapid tetracycline (TC) degradation under visible light. The Z-scheme heterojunction and nitrogen vacancy enhanced electron-hole pair separation and O 2 adsorption. Additionally, we proposed a mechanism for dual-channel photocatalytic H 2 O 2 production. This work presents a novel strategy for in-situ H 2 O 2 production and activation, facilitating water decontamination .
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Yukun Li,Haiyang Zhang,Sen Yao,Cong Chao,Qishi Chen,Junhua Chen,Fengjuan Fan,Hongyuan Jia,Mingjia Dong
Bi 2 WO 6 /g-C 3 N 4 (BC) Z -scheme heterojunction assembled with graphene aerogel (GA) was successfully prepared by a simple hydrothermal associated with natural seasoning method. The physico-chemical, morphological and photoelectric properties of the Bi 2 WO 6 /g-C 3 N 4 /GA (BCGA) composite was characterized by various instruments, and its photocatalysis performance for persulfate (PDS) activation was explored in the removal of ciprofloxacin (CIP) under simulated sunlight (SSL) irradiation. The optimal mass ratio of BC was 30 % (abbreviated as BCGA-30) in BCGA. Under the optimal conditions (10 mg/L CIP, 50 mg/L PDS, pH = 6.66 and 0.2 g/L BCGA-30), the degradation rate of CIP was 94.3 %, which was 4.18 times that of BC. As the carrier of BC, GA could promote the light absorption and the photo-induced electron transfer of BCGA-30. The removal efficiency of CIP was remained at 80.2 % after five cycles, illustrating that BCGA-30 had an excellent repeatability. Based on the results of the energy band structures , HR-TEM, XPS and free radical quenching experiments, the heterojunction type of composites and possible photocatalytic activation mechanism during CIP degradation were confirmed over BCGA-30/PDS/SSL system. The BCGA-30/PDS/SSL system might be a potential treatment process for the removal of antibiotics wastewater.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Tengyue Song,Yuhuai Shi,Xueli Zhang,Wenhui Wang,Wenkuang Pan,Guangwei Xiao,Mengli Yin,Xiong Cao
Energetic solid propellants are critical technologies for advancing strategic and tactical weaponry. To further develop the application of CL-20 to energetic solid propellants, it is necessary to explore more efficient catalysts to enhance their thermal decomposition characteristics. In this paper, three composites of nickel–iron layered double oxides doped with 0 wt%, 5 wt% and 20 wt% g-C 3 N 4 (NiFe-LDO/g-C 3 N 4 ) were synthesized by co-precipitation and heat treatment methods. These composites were characterized using Scanning electron microscope (SEM), X-Ray diffractometer (XRD), Fourier transform infrared (FT-IR) spectrometer, and X-ray photoelectron spectrometer (XPS). Three prepared composites were tested for catalytic pyrolysis performance of CL-20 using Differential scanning calorimeter (DSC). The results show that NiFe-LDO/g-C 3 N 4 has an excellent layered structure and can significantly enhance the thermal decomposition performance of CL-20. Compared with 253.52 °C for raw CL-20, the thermal decomposition peak temperatures decreased to 246.61 °C, 245.64 °C and 244.08 °C after addition of the three catalysts, respectively. Additionally, the activation energies declined from 234.02 kJ·mol −1 to 192.55 kJ·mol −1 , 176.33 kJ·mol −1 and 160.78 kJ·mol −1 . Then, a potential catalytic mechanism is proposed. This study shows that NiFe-LDO/g-C 3 N 4 serves as a high-quality catalyst for the enhancement of CL-20 thermal decomposition performance, with further prospective applications in solid propellants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Ming Yi,Jiangwei Shang,Yunqing Liu,Xiuwen Cheng
In recent years, eliminating impurities from wastewater has become increasingly crucial. Photocatalytic technology has become a viable strategy for degrading organic pollutants. This study created novel Z-scheme TiO 2 -modified g-C 3 N 4 using a solvent-tunable, two-step method. The optimized TiO 2 /g-C 3 N 4 -Et/vis system demonstrated a removal efficiency of 94.4 % for acetaminophen (ATP) within 40 min and 91.0 % for methylparaben (MPB) within 100 min. Furthermore, the system maintained 92.7 % ATP degradation efficiency after five cycles, indicating excellent recoverability and sustainability. Photochemical tests and mechanistic studies revealed that solvent modulation and TiO 2 modification increased the specific surface area and facilitated the formation of Z-scheme heterojunctions. These heterojunctions effectively inhibit the recombination of photogenerated electron-hole pairs and enhanced the degradation efficiency of organic pollutants, primarily driven by •O 2 − . LC-MS analysis found the intermediates of ATP and MPB, and several potential routes of degradation were suggested. This work sheds fresh light on the production of high-performance TiO 2 /g-C 3 N 4 nanoparticles for applications related to energy and the environment.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Dong Chen,Rui Zhang,Jie He,Maoqin Xu,Zixi Li,Yujie Liu,Dongyuan Li
A nitrogen-deficient g-C 3 N 4 -BiOBr-Bi 2 WO 6 /PVDF composite ultrafiltration membrane with high-efficiency retention and degradation capabilities for various dyes and antibiotics was prepared using a simple in situ deposition combined with phase inversion method. Under normal pressure, the membrane achieved a retention rate of over 95 % for multiple dyes, featured numerous hydrophilic sites, and demonstrated an average pollutant flux of 147.6L·m −2 ·h −1 . In a simulated visible solar light flow-circulation device, the composite membrane exhibited excellent efficiency and final degradation performance, achieving a degradation rate of 97.7 % for RhB within 1 h and a final degradation rate of 99.6 %. DFT calculations provided evidence for the potential distribution and interaction forces between nanoparticles and PVDF molecules, supporting the observed results. The in situ synthesized BiOBr nanomaterials grow and embed within the membrane, forming heterojunctions with an internal electric field alongside other materials. The incorporation of heterojunction materials improves the surface and internal physical structure of the PVDF membrane, endowing it with excellent photocatalytic degradation performance, enhanced hydrophilicity, and improved retention capabilities. Additionally, the composite membrane exhibits outstanding self-cleaning properties. This work provides a broad-spectrum and efficient solution for water pollution treatment.
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