SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Fang Wang,Yun Liao,Tingting Li,Liangshu Xia
Uranium (VI) removal and recovery from wastewater is crucial for sustainable development of nuclear energy and environmental remediation. Among various techniques, the photocatalytic reducing uranium (VI) to immobile uranium (IV) has been regarded as one of the most effective strategies. As a result, the design and fabrication of photocatalysts have attracted extensive attention. In this study, g-C 3 N 4 decorated dendritic fibrous nano-silica was fabricated first and then coupled with CdS. The fibrous photocatalyst showed high surface area and extended visible light absorption. More importantly, it exhibited a satisfying performance for the photocatalytic reduction of uranium (VI) under air atmosphere with solar irradiation. The SEM images and XPS spectrum confirmed that uranium (VI) was indeed photo-reduced to uranium (IV). Meanwhile, quenching experiments showed that O 2− played a key role in uranium (VI) reduction.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Huihui Li,Xiaoyong Wu,Shu Yin,Kenichi Katsumata,Yuhua Wang
Novel g-C 3 N 4 /rutile-brookite TiO 2-x N y composite photocatalysts were fabricated through a facile solvothermal approach. The effect of rutile phase TiO 2 with brookite TiO 2 and g-C 3 N 4 on the photocatalytic activity of g-C 3 N 4 /nitrogen-doped TiO 2 composite was studied. The photocatalytic performance of the photocatalyst was evaluated by measuring the degradation of NO gas under visible and UV light irradiation. It is suggested that g-C 3 N 4 /rutile-brookite TiO 2-x N y forms a Z-scheme photocatalytic system, which shows improvement on the photocatalytic activity than that of g-C 3 N 4 /single brookite TiO 2-x N y . By importing rutile phase TiO 2-x N y , the photogenerated electrons can efficiently transfer from rutile TiO 2 to g-C 3 N 4 , which results in the separation of electron and hole pairs, enhancing the photocatalytic ability. However, single brookite TiO 2-x N y can not remove the photogenerated electrons efficiently and the photocatalytic performances of composites decrease with g-C 3 N 4 amount increase.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Na Li,Xian Li,Xiaoe Ming,Jingyuan Chen,Yeyi Chen,Lifen Zhou,Ruirui Yao,Yuqi Yao
Deferasirox (DEF) is an important iron chelator for treatment of iron overload–related diseases. Monitoring DEF concentration in human serum will provide some valuable information for clinical diagnosis and therapy of such diseases. In this study, we developed a peroxidase-mimicking colorimetric sensor for the detection of DEF by simple assembly of a telomeric dimeric G-quadruplex DNAzyme with Cu 2+ . The DNAzyme–catalyzed oxidation of 3,3′,5,5′-tetramethylbenzidine in the presence of H 2 O 2 can generate a quantitative colorimetric signal, and the color change can be discerned by the naked eye. Compared with the reaction rate of the monomeric G-quadruplex–Cu 2+ DNAzyme, the reaction rate of the dimeric G-quadruplex–Cu 2+ (G2–Cu 2+ ) DNAzyme is significantly accelerated, and the reaction rate gradually increases and then reaches a plateau with increasing number of TTA spacers. Herein, the G2–Cu 2+ DNAzyme is chosen for the highly sensitive detection of DEF based on the DEF–Cu 2+ complex–induced inhibition of its peroxidase-mimicking activities. The limit of detection (LOD) of DEF is achieved as low as 0.03 μM, and the linear range is from 0.05 to 1.2 μM. The proposed strategy exhibits excellent selectivity in the presence of potential interferents, such as metal ions and small molecules. Importantly, the G2–Cu 2+ DNAzyme is further expanded to detect DEF in dispersible tablets and human serum samples. Overall, this G2–Cu 2+ DNAzyme provides a simple, low-cost, and rapid platform for DEF detection. This novel strategy is the first example of DEF analysis by utilizing signal amplification technology based on the G-quadruplex DNAzyme and holds great potential for DEF quality control and therapeutic drug monitoring.
研究领域:
生物化学
·
医学诊断
·
药物分析
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Enzhou Liu,Chenyang Jin,Chenhui Xu,Jun Fan,Xiaoyun Hu
Transition metal phosphides are considered as the most prospective replacements for noble metal cocatalysts used for H 2 evolution during photocatalytic water splitting. In this work, Ni 2 P/g-C 3 N 4 composite photocatalyst was synthesized using a simple in-situ hydrothermal method by one step. Benefiting from the excellent light trapping, efficient transfer of charge carriers and strong stability of Ni 2 P nanoparticles , as well as the stable interface contact between Ni 2 P and g-C 3 N 4 , the Ni 2 P/g-C 3 N 4 exhibit greatly enhanced H 2 evolution performance during photocatalytic water splitting . The optimized H 2 evolution rate can reach 3344 μmol h −1 g −1 over 17.5 wt% Ni 2 P/g-C 3 N 4 , which is 68.2 times greater than that of pure g-C 3 N 4 and even much greater than that of 15 wt% Pt/g-C 3 N 4 . The apparent quantum efficiency (QE) is about 9.1% under 420 nm monochromatic. The enhancement mechanism was demonstrated in detail by transient photocurrent responses, photoluminescence spectra and electrochemical impedance spectroscopy . This work develops a facile strategy to fabricate transition metal phosphide/semiconductor heterojunction systems with potential application for photocatalytic H 2 evolution.
研究领域:
材料科学
·
能源化学
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 15
·A3564
·
IF 3.12
Yuanduo Qu,Zhiwei Tang,Lianfeng Duan,Xuesong Li,Xueyu Zhang,Wei Lü
Great efforts have been dedicated to fabricating electrode materials of supercapacitors especially for carbon-based system. To achieve satisfied device performance, the fabrication of electrodes generally involved complicated procedure, poisonous agents, and expensive materials. Herein, we develop a facile and economical method to prepare carbon-based electrode materials. The nitrogen-rich g-C3N4 is used as template and N source, and glucose is used as C source to prepare N-doped 3D porous carbon materials by hydrothermal treatment followed by calcinations. The structure and N content could be adjusted by hydrothermal temperature. The specific surface area of 954 m2 g−1 and 11% N content is achieved, thus providing the excellent carrier storage ability and electrocatalytic activity. The supercapacitors fabricated from present 3D carbon networks achieve a specific capacitance of 90F/g, and shows excellent cycling stability. Present method is free of involving complicating procedure and poisonous reagents for fabrication of 3D carbon structures.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2021
·Vol. 36
·期 7
·075004
·
IF 2.352
Yefeng Chen,Dan Tang,Zhuhan Wang,Wen Li,Mengyun Yin,Qin Yang,Yafen Zhou,Kaiming Zhang,Taotao Kan,Limei Zhou
As an important intermediate, imine is widely used in industrial chemistry. The photocatalytic oxidation of amines to form imines is a green and economical method. But it remains a challenge for the efficient transformation under mild conditions. Herein, a Z-scheme carbon nitride (CM)-Fe2O3 heterojunction photocatalyst was synthesized by in-situ preparation of Fe2O3 nanoparticles on two-dimensional CM nanosheets. The as-prepared catalyst exhibited efficient photocatalysis activity in selective oxidation of benzylamine to N-benzylidene benzylamine. Under ambient air and room temperature, the selectivity and conversion rate both can reach 99.9%, and the corresponding turnover frequency value reaches up to 9.99 mmol g−1 h−1, superior to the most of heterogeneous photocatalysts reported in previous literatures. The excellent catalytic activity of the modified CM material may be due to the enhanced absorption of visible light and the improved photogenerated carrier separation and migration rate, and the Z-scheme mechanism also retains the strong oxidation and reduction ability of the composite material. This work will provide a promising and practical method to promote the photocatalytic conversion of solar-driven organics.
研究领域:
材料科学
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环境化学
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光催化技术
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DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 12
·892
·
IF 3.8
Yangzhou Deng,Yuqi Zhang,Kunkun Wei,Yue Wang,Shihui Zou,Juanjuan Liu
Advanced oxidation catalyzed by metal oxides is a promising approach for degrading organic pollutants in wastewater. A critical strategy to enhance the performance of these catalysts is optimizing the dispersion of their active components through innovative synthesis methods. In this study, we report a one-pot synthesis of g-C3N4nanomeshes supported with highly dispersed VO2catalysts (V-g-C3N4) for the advanced oxidation of methylene blue (MB). The characterization results reveal that the involvement of VCl3in the pyrolysis of melamine facilitates the formation of g-C3N4nanomeshes with abundant amino groups (NH/NH2). The strong interaction between vanadia species and amino groups prevents VO2particles from agglomerating, resulting in a significantly higher vanadia dispersion than V-g-C3N4-im synthesized via the traditional impregnation method. V-g-C3N4exhibits a sophisticated microstructure and surface structure, which leads to a rate constant 2.3-fold higher than V-g-C3N4-im in the catalytic degradation of methylene blue using H2O2as the oxidant. X-ray photoelectron spectroscopy, trapping experiments, and electron paramagnetic resonance measurements reveal that the rapid adsorption and fast diffusion of MB over g-C3N4nanomeshes, together with the efficient H2O2activation into ·OH radicals via the V4+/V5+redox cycle, synergistically contribute to the superior MB removal efficiency of V-g-C3N4. Moreover, V-g-C3N4demonstrates no significant decrease in activity even after the fourth cycle, indicating its excellent stability during the pollutant removal process.
研究领域:
环境科学
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材料科学
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催化化学
✓ 已验证
DOI
高影响因子
Functional Materials Letters
·
2021
·
IF 2.17
Xu Huang,Yiwen Zhang,Zhi Liang,Yingfeng Zhao,Huiwen Yuan,Mingyang Li,Fengping Peng,Wei Wang
In this paper, a series of isotype heterojunction photocatalysts with urea-derived g-C 3 N 4 (CNU) as the core and cyanamide-derived g-C 3 N 4 (CNC) as the shell are reported. A much thinner CNC shell which can protect the CNU core from thermal etching and determines the light absorption is beneficial to improve the photocarrier transfer and separation efficiency, pore volume, and the overall crystalline degree of the most active CNU/CNC2 core–shell isotype heterojunction photocatalyst for rhodamine B (RhB) degradation. Contrast experiments confirm that the electron-derived oxidant species (⋅O 2 − ) play key roles in driving the RhB degradation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Zhengyuan Jin,Jiaqi Chen,Shaolong Huang,Jiahao Wu,Qitao Zhang,Wenfei Zhang,Yu-Jia Zeng,Shuangchen Ruan,Teruhisa Ohno
A composite photocatalyst composed of carbonaceous material and g-C 3 N 4 is fabricated by a simple thermal treatment of melamine (hydrothermally treated melamine) with cellulose acetate. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and elemental analysis data reveal the formation of carbonaceous material in the composites. The photocatalytic activity was evaluated by the H 2 liberation rate from water splitting under visible-light irradiation. The optimized composite, which is prepared from the precursor of hydrothermally treated melamine with cellulose acetate, shows 35 times higher photocatalytic activity than bulk g-C 3 N 4 (melamine as the precursor) and a quantum efficiency of 1.05% (0.01 g of catalyst) under irradiation at 420 nm. The enhancement of the photocatalytic activity is ascribed to the unique electronic properties of the carbonaceous material, the enlarged specific surface area and the improved light absorption.
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
MOLECULES
·
2021
·Vol. 26
·期 22
·7054
·
IF 4.412
Juan Liang,Chengjun Jing,Jiarong Wang,Yupawang Men
Graphitic carbon nitride (g-C3N4) photocatalysts were synthesized via a one-step pyrolysis process using melamine, dicyandiamide, thiourea, and urea as precursors. The obtained g-C3N4materials exhibited a significantly different performance for the photocatalytic reduction of Cr(VI) under white light irradiation, which is attributed to the altered structure and occupancies surface groups. The urea-derived g-C3N4with nanosheet morphology, large specific surface area, and high occupancies of surface amine groups exhibited superior photocatalytic activity. The nanosheet morphology and large surface area facilitated the separation and transmission of charge, while the high occupancies of surface amine groups promoted the formation of hydrogen adsorption atomic centers which were beneficial to Cr(VI) reduction. Moreover, the possible reduction pathway of Cr(VI) to Cr(III) over the urea-derived g-C3N4was proposed and the reduction process was mainly initiated by a direct reduction of photogenerated electrons.Keywords:Cr (VI) reduction;photocatalytic;g-C3N4precursors;nanosheet morphology;surface characteristics
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 14
·1964-1972
·
IF 8.683
Mingrui Guo,Meng Chen,Jixiang Xu,Jing Wang,Lei Wang
The intramolecular doping of donor units or acceptor units in carbon nitride (g-C3N4, CN) is regarded as an effective method for regulating electron structure and enhancing the catalytic activity of CN. Herein, benzene rings and eosin Y (EY) co-grafted CN with carbon vacancies (EY-PhCN) was prepared by calcining a supermolecular precursor consisting of melamine, cyanuric acid, and benzonquanmine followed by covalently hooking the EY. Theoretical and experimental results demonstrated the directional electron transfer, spatially isolated electron–hole pairs and increased light response in the resulting ultrathin holey EY-PhCN. An optimal H2 production rate of 4.44 mmol g−1 h−1 was obtained over the 1%Pt-loaded EY-PhCN catalyst. The corresponding apparent quantum yield was 27.38% at 420 nm. Moreover, the EY-PhCN exhibited high CO2 reduction rate with H2O. The yields of CO and CH4 were 61.91 and 13.75 μmol g−1, respectively within 5 h light irradiation, higher than that of CN (CO: 24.60 μmol g−1, CH4: 8.51 μmol g−1). The work may give new insight into associating carbon vacancies and edge decoration on CN to achieve remarkably enhanced photocatalytic activity.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Zhu Ye’an,Qiu Jialin,Zhang Zimeng,Nie Yidan,Wang Bo,Peng Li,Song Zengkai,Xie Zongbo,Le Zhanggao
The photocatalytic conversion of U(VI) to a lower oxidation state is essential in environmental cleanup, with g-C 3 N 4 being a leading photocatalyst candidate. However, the application of conventional bulk g-C 3 N 4 is limited by its low specific surface area, high rates of photogenerated carrier recombination, and limited utilization of visible light. This study presents a novel synthetic approach, termed “thermal polymerization-acidification-annealing,” that uses urea to prepare modified g-C 3 N 4 samples. Notably, the CN-3 sample has a coral-like porous structure, which significantly increases its specific surface area and reduces the bandgap, thereby improving its photocatalytic performance. Under 100 min of visible light irradiation, the CN-3 sample achieved a 95.5% reduction of U(VI) in solution, which is 2.5 times more efficient than conventional g-C 3 N 4 . The material also demonstrated excellent stability and reusability, maintaining nearly 90% reduction in U(VI) after five consecutive photocatalytic cycles. These results highlight the importance of morphological engineering for enhancing the photocatalytic performance of g-C 3 N 4 and provide a viable strategy for developing efficient and durable materials for environmental and energy applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）