Journal of Environmental Chemical Engineering
·
2021
·Vol. 9
·期 4
·105292
·
IF 5.909
Jie Zhou,Wenyi Cai,Jing Ding,Hui Wan,Guofeng Guan
The appropriate construct of Z-scheme heterostructure composite with high photocatalytic activity has created new opportunities for environmental protection. Herein, graphitic carbon nitride quantum dots/tungsten trioxide (CNQDs/WO 3 ) was firstly fabricated using CNQDs decorated onto the surface of WO 3 nanorod grown along the [110] orientation in hydrothermal environment to construct a Z-scheme heterostructure composite. By various characterization methods, the crystal structure, micro morphology, atomic valence state and surface functional groups of the catalyst were systematically revealed. The results indicated that Z-scheme heterojunctions between CNQDs and WO 3 were successfully constructed. Compared with pure WO 3 , CNQDs/WO 3 exhibited prominent photoreduction performance under visible light irradiation. The optimal 5% CNQDs/WO 3 could reduce almost 100% Cr (VI) under acidic condition with the best photocatalytic activity within 90 min. More than this, 5% CNQDs/WO 3 also displayed excellent stability and recyclability even after five cycles of photoreduction experiments. Based on the free radical quenching experiments, the possible photoreduction reaction mechanism had been proposed in detail. The Z-scheme heterostructure provided the possibility of the generation, rapidly transfer and efficient separation of photogenerated electrons, which were major active species in the Cr (VI) photoreduction process.
研究领域:
环境催化
·
材料化学
·
纳米科技
·
光催化
·
环境污染治理
·
半导体异质结
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2020
·
IF 2.65
Bo Lv,Xuefan Feng,Xiaoping Wu,Xiaoming Wang,Xiong Zou,Huazhong Wang,Fuqin Zhang
Herein, a novel composite photocatalyst was prepared by the vapor deposition of g-C 3 N 4 on TiO 2 nanosquare, dominated with {001} facets. The deposition method is robust, convenient, and effective. The surface topography and structure of the composites were analyzed by XRD , XPS, SEM, and TEM . The mechanism for enhanced photocatalysis was studied using PL, PC, UV–vis-NIR-DRS, TRPL, EIS and EPR. The photocatalytic activities of the fabricated composites were evaluated by the degradation of methylene blue (MB) and hexavalent chromium ions (Cr 6+ ) under visible light irradiation. The photodegradation of MB and Cr 6+ was completed in 50 and 40 min, respectively. Based on a pseudo-first-order kinetic model (ln(C 0 /C) = kt), the measured the degradation rate constant for MB using gCN/TO5 was 4.6 and 35.9 times higher than that of pure g-C 3 N 4 and TiO 2 , respectively. Similar results were found for the Cr 6+ degradation. The outstanding photocatalytic performance of the g-C 3 N 4 on TiO 2 composite was ascribed to the presence of the TiO 2 /g-C 3 N 4 heterojunctions , which effectively improved the separation of the photoexcited electrons and holes hence the enhancement of visible-light photoactivity . Overall, this work showed a convenient and efficient method for fabricating the visible light photocatalysts with established possible mechanisms for the photoactivity of the hybrid photocatalytic composite material.
研究领域:
材料科学
·
环境科学
·
化学
·
光催化
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Shihui Zhang,Xu Zhang,Wanting Shi,Weiyan He,Caihong Li,Xiaojing Wang
Slow charge transfer and a weak built-in electric field (BIEF) at the heterojunction interface critically hinder the construction of efficient S-scheme heterojunctions. Secondary calcination and ultrasonic treatment of g-C 3 N 4 enhance interfacial contact with MIL-101, shortening carrier migration paths. P and Mn doping increases the Fermi-level difference between g-C 3 N 4(C,S) and MIL-101, strengthening the BIEF to drive directional carrier migration. This facilitates the recombination of carriers with low-redox-potential at the heterojunction interface while spatially separating carriers with high-redox-potential, successfully constructing an S-scheme P-Mn-MCN (C,S) heterojunction. The optimized system delivers remarkable photocatalytic performance, achieving 98 % tetracycline hydrochloride degradation under visible light within 60 min.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Jiahui Zhao,Dahai Zeng,Qiwei Wang,Zhidan Lin,Florian Vogel,Wei Li,Peng Zhang
Ultrafiltration technology, separating water from impurities by the core membrane, is an effective strategy for treating wastewater to meet the ever-growing requirement of clean and drinking water . However, the similar nature of hydrophobic organic pollutants and the membrane surface leads to severe adsorption and aggregation, resulting unavoidable membrane degradation of penetration and rejection. The present study presents a novel block amphiphilic polymer, polyethersulfone-g-carboxymethyl chitosan@MWCNT (PES-g-CMC@MWCNT), which is synthesized by grafting hydrophobic polyethersulfone to hydrophilic carboxymethyl chitosan in order to suspend CMC in organic solution. A mixture of hydrophilic carboxymethyl chitosan and hydrophobic polymers (polyethersulfone), in which hydrophilic segments are bonded to hydrophobic segments, could provide hydrophilic groups, as well as gather and remain stable on membrane surfaces by their hydrophobic interaction for improved compatibility and durability. The resultant ultrafiltration membranes exhibit high water flux (198.10 L m −2 ·h −1 ), suitable hydrophilicity (64.77°), enhanced antifouling property (82.96%), while still maintains excellent rejection of bovine serum albumin (91.75%). There has also been an improvement in membrane cross-sectional morphology, resulting in more regular pores size (47.64 nm) and higher porosity (84.60%). These results indicate that amphiphilic polymer may be able to significantly promote antifouling and permeability of ultrafiltration membranes.
研究领域:
环境科学
·
材料科学
·
水处理技术
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2016
·
IF 5.886
Wang Ren,Ying Zhang,Hong Guo Chen,Zhong Feng Gao,Nian Bing Li,Hong Qun Luo
A novel signal-on and label-free resonance Rayleigh scattering (RRS) aptasensor was constructed for detection of Hg2+ based on Hg2+-triggered Exonuclease III-assisted target recycling and growth of G-quadruplex nanowires (G-wires) for signal amplification. The hairpin DNA (H-DNA) was wisely designed with thymine-rich recognition termini and a G-quadruplex sequence in the loop and employed as a signal probe for specially recognizing trace Hg2+ by a stable T–Hg2+–T structure, which automatically triggered Exonuclease III (Exo-III) digestion to recycle Hg2+ and liberate the G-quadruplex sequence. The free G-quadruplex sequences were self-assembled into guanine nanowire (G-wire) superstructure in the presence of Mg2+ and demonstrated by gel electrophoresis. The RRS intensity was dramatically amplified by the resultant G-wires, and the maximum RRS signal at 370 nm was linear with the logarithm of Hg2+ concentration in the range of 50.0 pM to 500.0 nM (R = 0.9957). Selectivity experiments revealed that the as-prepared RRS sensor was specific for Hg2+, even coexisting with high concentrations of other metal ions. This optical aptasensor was successfully applied to identify Hg2+ in laboratory tap water and river water samples. With excellent sensitivity and selectivity, the proposed RRS aptasensor was potentially suitable for not only routine detection of Hg2+ in environmental monitoring but also various target detection just by changing the recognition sequence of the H-DNA probe.
研究领域:
分析化学
·
环境科学
·
生物传感技术
✓ 已验证
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 6
·1-12
·
IF 5.3
Chen Yafei,Zhang Xuhui,Huang Wanjin,Jin Zhenhuan,Wei Xiaoping,Li Jianping
Atrazine (ATZ) is used extensively, resulting in residues in food and the environment, posing a serious threat to human health. Herein, Cd 0.5 Zn 0.5 S/Ti 3 C 2 photoelectric material was synthesized and immobilized on a FTO electrode as a photoanode. A photoelectrochemical (PEC) aptamer sensor was constructed for the highly sensitive and selective determination of ATZ based on signal amplification via cascade catalysis of CRISPR/Cas12a and G-quadruplex/hemin DNAzyme (G4/hemin DNAzyme). G4/hemin DNAzyme catalyses the oxidation reaction between H 2 O 2 and dopamine (DA) to form polydopamine (PDA) deposit. This process, in turn, inhibits the photocurrent at the photoanode, leading to a decrease in photocurrent. Concurrently, the depletion of DA as an electron donor for the PEC reaction at the photoelectrode further contributes to the decrease in photocurrent. ATZ can hybridize with ATZ aptamer (Apt) in Apt/cDNA to release activation strand (cDNA), which activates the activity of CRISPR/Cas12a and triggers cleavage of G4, causing the cleaving of G4/hemin DNAzyme immobilized on the electrode surface. This process leads to a decrease of G4/hemin DNAzymes amount on the electrode, consequently reducing both the PDA generation and the DA consumption. As a result, the photocurrent is restored. The cascade catalysis of CRISPR/Cas12a and G4/hemin DNAzyme has been demonstrated to result in photocurrent amplification. The photocurrent change was linear with the logarithmic value of ATZ concentration in the range 1.00 × 10 –12 to 1.00 × 10 –5 mol/L. The limit of detection was 3.47 × 10 –13 mol/L. The sensor has been successfully applied to the determination of trace ATZ in environmental and food samples. Graphical abstract
研究领域:
环境科学
·
分析化学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Jing Fan,Yanan Yang,Jie Liu,Qi Qi,Fenhong Song
In light of the energy and environmental crises humanity faces, photocatalytic hydrogen production has emerged as one of the effective solutions. Nevertheless, the development of high-performance, low-energy-consumption, and long-lasting stable photocatalysts remains extremely urgent. In this study, a NiS-Mn 2 SnS 4 /g-C 3 N 4 composite with efficient photocatalytic hydrogen evolution performance is synthesized via a simple physical mixing method and calcination process. The introduction of NiS and Mn 2 SnS 4 significantly increases the specific surface area of the g-C 3 N 4 composite, and a dual Type-II heterojunction capable of efficiently separating electron-hole pairs is formed between the components and g-C 3 N 4 . Under 300 W xenon lamp irradiation, the NiS-Mn 2 SnS 4 /g-C 3 N 4 composite achieves a hydrogen evolution rate of 7672.45 μmol·g −1 ·h −1 , corresponding to 3.76, 59.74, and 254.64 times enhancements compared to bare g-C 3 N 4 , NiS, and Mn 2 SnS 4 , respectively. After four cycles, the hydrogen production of NiS-Mn 2 SnS 4 /g-C 3 N 4 still reaches 91 % of the rate in the first cycle. Photoelectrochemical property characterization demonstrates that the composite samples can generate more active sites, reduce the overpotential for H 2 evolution, and enhance light absorption efficiency. Combined with density functional theory (DFT) calculations and band structure analysis, it is confirmed that a strong electronic coupling effect exists among NiS, Mn 2 SnS 4 , and g-C 3 N 4 , and the electron transfer follows a Type-II pathway. This study provides important references and insights for constructing high-activity and high-specific-surface-area g-C 3 N 4 -based photocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Minmin Liu,Baitong Niu,Hongxu Guo,Shaoming Ying,Zhangxu Chen
g-C 3 N 4 @Ni 3 C nano-sheets have been prepared by a simple pyrolysis under different temperature, and the as-prepared samples have been characterized by many means, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), the Brunauer–Emmett–Teller (BET) and pore size distribution. The as-prepared g-C 3 N 4 @Ni 3 C nano-sheet has been proved to be a versatile functional material, that is the application in supercapacitor electrode materials, hydrogen generation via NaBH 4 hydrolysis and reduction of p– nitrophenol. This method offers a new strategy for preparation of environmental energy materials through simple raw materials.
研究领域:
材料科学
·
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 12
·4360-4367
·
IF 4.099
Erbing Hua,Gang Liu,Guan Zhang,Xiaoxiang Xu
Separation of photo-generated electron–hole pairs plays a crucial role in determining the practical performance of semiconductor photocatalysts. Here we have successfully fabricated two dimensional g-C3N4/Ba5Ta4O15 nanosheet heterostructures through an in situ urea degradation method. The so-formed nanosheet heterostructures demonstrate superior photocatalytic activities in H2 evolution reactions over individual component. Further analysis using photoelectrochemical measurements suggests efficient charge separations at the interfaces of these heterostructures which contribute to a prolonged lifetime of photo-generated charges as well as the much enhanced photocatalytic activities. The in situ fabrication method adopted in this work ensures a firm anchorage of g-C3N4 onto Ba5Ta4O15 nanosheets and a face-to-face contact between these two semiconductors. Such a peculiar microstructure is critical to the high photocatalytic activity and apparently outweighs the conventional ones that involve only physical mixtures of two semiconductors and a point-to-point contact.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
半导体物理
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 37
·22987-22997
·
IF 3.945
Long Shi,Juanqin Xue,Wen Xiao,Peng Wang,Mingyang Long,Qiang Bi
The coal chemical industry generates large amounts of solid waste and volatile organic compounds (VOCs). In this study, the solid waste semi-coke powder obtained in the semi-coke production process was used as a raw material to prepare high-specific surface area semi-coke activated carbon (SAC) by a carbonization and activation process, and a ternary z-scheme heterojunction photocatalyst with high catalytic performance was loaded for synergistic treatment by adsorption and photodegradation to achieve waste treatment with waste. The prepared semi-coke activated carbon has a specific surface area of 619.27 m2 g−1, which can achieve effective adsorption of VOCs. The ternary z-scheme heterojunction photocatalyst BiPO4–BiVO4–g-C3N4 (PVCN) was supported on a semi-coke activated carbon substrate by a one-step sol–gel method. Based on the synergistic effect of adsorption and photocatalysis, the obtained PVCN/SAC material can degrade toluene by 85.6% within 130 minutes under simulated sunlight irradiation, which is 2.43 times that of pure photocatalyst. The rate of degrading toluene can be increased by 4.43 times. Capture experiments showed that superoxide radicals (˙O2−) and hydroxyl radicals (˙OH) were the key active species in the degradation pathway. Even after five cycles, the material maintained 81.6% of the degradation performance. In this work, we deeply investigate the mechanism of semi-coke activated carbon as a matrix for enhancing photocatalytic degradation performance. The findings of this work provide new insights into the efficient degradation of VOCs and provide a good theoretical basis for the development of high-performance photocatalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Hongyang Pan,Jiamin Gu,Kaiyang Hou,Junyao Li,Yu Wang,Yiying Yue
Photocatalytic technology has received considerable attention due to its advantages of high efficiency, economy and thorough degradation of pollutants, making it the most promising sewage treatment technology. However, the difficulty in recycling usually limits its applications. In our research, we developed a composite aerogel with excellent mechanical properties, photocatalytic properties and recyclability to adsorb and degrade rhodamine B (RhB) dye. In this composite, g-C 3 N 4 /BiOBr was loaded on the matrix of rGO and chitosan (CS), with borax as the crosslinking agent. The adsorption experiment showed that the equilibrium adsorption capacity of g-C 3 N 4 /BiOBr@CS/rGA aerogels were 3.08 mg/g. The composite photocatalyst of g-C 3 N 4 /BiOBr could effectively inhibit the recombination of photo-generated carriers, loaded on the rGO matrix with admirable conductivity, which further improved the photocatalytic performance. The degradation rate of RhB could reach to 94.6% at 180 min under the neutral condition of pH= 7. In addition, the amine group of CS reacted with the carboxyl group of GO to form an amide group, it enhanced the mechanical properties of the aerogels. The compressive strength was 0.152 MPa at 50% strain, and there was basically no decrease after 5 cycles. The composite aerogels exhibited good recycling performance, and the degradation rate was about 80% after 4 cycles.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jinge Du,Shuanglong Ma,Na Zhang,Wenjing Liu,Mengdi Lv,Tianjun Ni,Zhen An,Kai Li,Yichun Bai
A novel porous Z-scheme Ag/AgFeO 2 /g-C 3 N 4 (AAF/UPCN) photocatalyst was successfully prepared via a facile hydrothermal, precipitation and photo-deposition–method. Under visible light irradiation, AAF/UPCN exhibited excellent bisphenol A degradation effect and Staphylococcus aureus inactivation effect compared with porous g-C 3 N 4 (UPCN) and AgFeO 2 . The •O 2 ‾ was the major active species during the photocatalytic degradation process. For the photocatalytic mechanism, the photoexcited electrons of UPCN transferred to AgFeO 2 mediated by Ag nanoparticles . This charge migration and separation route was verified collectively by the PL spectra, photoelectrochemical characterizations, chemical scavenger experiments and ESR measurements. Furthermore, the band distribution of catalysts was obtained by DFT calculation. This Ag nanoparticles mediated electron transfer pathway could promote the effective segregation of photoexcited carriers. The synergistic effect of UPCN, AgFeO 2 and Ag in heterostructure could promote the efficient separation of photogenerated charge carriers. This study provides a new strategy for rational design of high-efficient g-C 3 N 4 -based photocatalysts for environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）