MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-8
·
IF 6.232
Long Yuanli,Liu Shuang,Cai Yunfei,Zhang Jiale,Zhang Xinfeng,Tang Yurong
Graphitic carbon nitride (g-C 3 N 4 ) as an outstanding photoresponsive nanomaterial has been widely used in biosensing. Other than the conventional single channel sensing mode, a triple-channel sensing array was developed for high discrimination of proteins based on the photoresponsive g-C 3 N 4 . Besides the photoluminescence and Rayleigh light scattering features of g-C 3 N 4 , we exploit the new photosensitive colorimetry of g-C 3 N 4 as the third channel optical input. The triple-channel optical behavior of g-C 3 N 4 can be synchronously changed after interaction with the protein, resulting in the distinct response patterns related to each specific protein. Such a triple-channel sensing array is demonstrated for highly discriminative and precise identification of nine proteins (hemoglobin, trypsin, lysozyme, cytochrome c, horseradish peroxidase, transferrin, human serum albumin, pepsin, and myoglobin) at 1 μM concentration levels with 100% accuracy. It also can discriminate proteins being present at different concentration and protein mixtures with different content ratios. The practicability of this sensor array is validated by high accuracy identification of nine proteins in human urine samples. This indicates that the array has a great potential in terms of analyzing biological fluids.
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研究领域:
生物传感器
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分析化学
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材料科学
·
生物技术
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Guanshu Zhao,Jing Ding,Fanyang Zhou,Xueqi Chen,Liangliang Wei,Qingwei Gao,Kun Wang,Qingliang Zhao
Inefficient utilization of photo-induced charge carriers and low recyclability are limitations for photocatalyst to get access to the practical application. A novel ternary BiVO 4 /g-C 3 N 4 /NiFe 2 O 4 composite with dual Z-scheme heterojunction was successfully developed and constructed to enhance the separation of photo-induced charge carriers and the absorption range of visible light. The structure, composition, morphology, magnetic, and optical properties of this photocatalyst were investigated comprehensively. The photocatalytic performance, mechanism, and pathway of ofloxacin degradation under visible light were studied. Results indicated that the internal interaction between different semiconductors presented the successful fabrication of ternary composite, and its red shift of adsorption range of visible light contributed to an enhancement of photocatalytic ability. The as-prepared ternary composite exhibited highest photocatalytic removal rate constant for ofloxacin, which was 3.8, 16.3 and 71.2 times as much as that of the pure BiVO 4 , pure g-C 3 N 4 and pure NiFe 2 O 4 , respectively. The five successive recycling experiments exhibited the high photocatalytic stability of the as-prepared catalyst, with simple recovery operation due to its magnetic property. The holes and superoxide radicals dominated the photocatalytic degradation process of pollutants. A dual Z-scheme heterojunction other than conventional heterojunction was responsible for the enhancement on redox capacity and the separation of charge carriers. Different transformation products during ofloxacin photocatalytic degradation were identified and transformation pathway was put forward. This study provides a promising strategy on the application of visible-light-driven photocatalysts in water treatment.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Junnan Qu,Yi Du,Yibing Feng,Jianyong Wang,Bo He,Minxing Du,Yang Liu,Nan Jiang
A visible-light-responsive hybrid photocatalyst , K-doped g-C 3 N 4 /BiOBr, has been synthesized by K-doped g-C 3 N 4 (K–CN) and BiOBr. The property of photocatalysts was characterized by XRD , FT-IR, TEM, SEM , DRS , PL , EIS and HPLC. The photocatalytic activity of K-doped g-C 3 N 4 /BiOBr was evaluated by degradation of Rhodamine B (RhB) and tetracycline hydrochloride under visible-light irradiation. The K-doped g-C 3 N 4 /BiOBr hybrid photocatalyst which contains K–CN with mass fraction of 20% (20K–CN/BiOBr) shows the best degradation efficiency of RhB. The degradation efficiency of RhB (20 mg/L) can be achieved to 99% and the degradation efficiency of tetracycline hydrochloride by BiOBr decreased with the increase of K-doped g-C 3 N 4 doping. The results of photocurrent and EIS assumed that the tight coupling between K–CN and BiOBr can enhance the separating efficiency of photo-generated carrier. In addition, the capture experiment proof that h + is the primary active substance in the system of reaction and ·OH is the auxiliary active substance. After five degradation experiments, the efficiency of the degradation of Rhodamine B by the sample can still reach 90%, which proves that the samples are stable. A new and efficient method is provided in this work to solve the pollution of organic dyes and antibiotics.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Polymers
·
2016
·Vol. 8
·期 1
·10
·
IF 2.944
Bo Jin,Juan Shen,Xiaoshuang Gou,Rufang Peng,Shijin Chu,Haishan Dong
A series of energetic polymers, poly(vinyl 2,4,6-trinitrophenylacetal)-g-polyglycidylazides (PVTNP-g-GAPs), were synthesized via cross-linking reactions of PVTNP with three different molecular weight GAPs using toluene diisocyanate as the cross-linking agent. The structures of these energetic polymers were characterized by ultraviolet visible spectra (UV–Vis), attenuated total reflectance-Fourier transform-infrared spectroscopy (ATR-FTIR), and nuclear magnetic resonance spectrometry (NMR). The glass-transition temperatures of these energetic polymers were measured with differential scanning calorimetry (DSC) method, and the results showed that all the measured energetic polymers have two distinct glass-transition temperatures. The thermal decomposition behaviors of these energetic polymers were evaluated by differential thermal analysis (DTA), thermogravimetric analysis (TGA) and thermogravimetric analysis tandem infrared spectrum (TGA-IR). The results indicated that all the measured energetic polymers have excellent resistance to thermal decomposition up to 200 °C, and the initial thermal decomposition was attributed to the breakdown of azide group. Moreover, the sensitivity properties of these energetic polymers were measured with the national military standard methods and their compatibilities with the main energetic components of 2,4,6-trinitrotoluene (TNT)-based melt-cast explosive were evaluated by using the DTA method. The results indicate that these energetic polymers have feasible mechanical sensitivities and can be safely used with TNT, cyclotetramethylene tetranitramine (HMX), 1,1-diamino-2,2-dinitroethene (FOX-7), 3-nitro-1,2,4-triazol-5-one (NTO) and 1,3,5-triamino-2,4,6-trinitrobenzene (TATB).Keywords:energetic polymer;poly(vinyl 2,4,6-trinitrophenylacetal)-g-polyglycidylazides;thermal stability;sensitivity property;compatibility
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 12
·6939-6945
·
IF 10.733
Fu Zhang,Jihua Zhang,Jianming Li,Xu Jin,Yapeng Li,Min Wu,Xiongwu Kang,Tao Hu,Xiaoqi Wang,Wei Ren,Genqiang Zhang
Transition metal phosphide (TMP) co-catalysts have been widely applied to modify graphitic carbon nitride (g-C3N4) for improving the photocatalytic activity, but it is still a great challenge to fabricate high performance and stable g-C3N4 based photocatalysts decorated with TMP co-catalysts by simple approaches. Herein, we report a facile and general strategy for the synthesis of TMP/g-C3N4 hybrid photocatalysts with high H2 production performance under visible light irradiation. Among the as-prepared TMP/g-C3N4 hybrids, the CoP/g-C3N4 sample with an optimum mass content of 2.5 wt% delivers the highest photocatalytic H2 evolution rate of 956.8 μmol g−1 h−1. DFT calculations and experimental results reveal that the superior catalytic activity could be predominantly attributed to the larger number of active sites and the enhanced photo-excited charge transfer dynamics benefitting from the synergistic effect of the ultrasmall particle size and the intimate contact interface between g-C3N4 and CoP. We anticipate that the protocol would provide a promising strategy for designing TMP co-catalyst based hybrid nanostructures aiming to optimize photocatalytic hydrogen generation efficiency.
研究领域:
材料科学
·
催化化学
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能源科学
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DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
W.-W. Liu,Y.-C. Liu,C.-Y. Cui,S.-T. Niu,W.-J. Niu,M.-C. Liu,M.-J. Liu,B. Gu,L.-Y. Zhang,K. Zhao,F. Ran,Y.-L. Chueh
Fast extraction of photo-generated charge plays a crucial function in improving the photovoltaic conversion efficiency (PCE) of the perovskite solar cells (PSCs). Here, an effective strategy to decrease the charge recombination losses by introducing versatile carbon nitride ( g -C 3 N 4 ) nanosheets to the CsPbBr 3 films was demonstrated. The incorporation of the g -C 3 N 4 additive can restrain the nucleation and crystalline growth rate of perovskite films by an interaction of lone pair electrons from the exposed N atoms to the PbBr 2 precursor, resulting in high-quality CsPbBr 3 films with an increase in crystalline size. Notably, a ‘coupling effect’ between the lone pair electrons from g -C 3 N 4 nanosheets and unsaturated Pb dangling bonds (Br vacancies) around the grain boundaries significantly decreases trap states caused by defects, leading to the fewer recombination centers in CsPbBr 3 films. The g -C 3 N 4 nanosheets serving as an energy barrier can also successfully suppress the recombination loss of back electrons with holes from the g -C 3 N 4 interface, yielding a superior PCE of 8.0% with a fill factor of 80.25%. The result opens an alternative path to enhance the performance of CsPbBr 3 PSCs by passivating the trap states of perovskite films with the improvement of the crystallization quality and charge extraction efficiency.
研究领域:
材料科学
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光伏技术
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Saudi Chemical Society
·
2021
·
IF 3.932
Tao Chen,Yuan Zhao,Ya-nan Sang,Min Tang,Guo-wen Hu,Xiao-bing Han,Jie Gao,Rui Ma
Efficient adsorption and separation of organic dyes in the wastewater is highly desirable for environmental protection. A facile synthesis of magnetic bio-based chitosan (CS) microspheres grafted with sodium polystyrene sulfonate (SPSS) via electron beam radiation is described. The obtained microspheres were characterized by FTIR, SEM, TG and VSM, which demonstrated millimetric magnetic CS-g-SPSS microspheres were obtained with enhanced thermal stability. Experimental parameters such as absorbed dosage, mass ratio, initial pH, initial concentration and contact time for the adsorption were thoroughly investigated. To investigate the adsorption rate and recyclability, evaluation of adsorption kinetic model and adsorption/desorption experiment were conducted.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Shufan Feng,Yan-Ping Zhang,Huihui Xu,Xue-qing Gong,Jianli Hua
Developing environmental-friendly photocatalysts with efficient photocatalytic activity is a promising way to tackle energy and environment issues. In this paper, perylene diimide (PDI) and its four derivatives ( SF-HPDI , N-HPDI , S-HPDI, and Se-HPDI ) with variable substituents at the bay position were synthesized and further used to construct the heterojunctions with g-C 3 N 4 for photocatalytic H 2 O 2 evolution. Among them, Se-HPDI /g-C 3 N 4 heterojunction achieves the highest H 2 O 2 production rate of 224.27 μM h –1 under visible light, which is 10.1 times higher than that of bare g-C 3 N 4 . The enhancement is because introducing substituents at the bay position increases the disparity of electron distribution between different constituent layers in heterojunctions, which is conducive to improving the interfacial electric field. Also, the load of PDIs broadens the optical absorption range of g-C 3 N 4 and suppresses H 2 O 2 decomposition. This work may inspire the further design of PDI-based photocatalysts.
研究领域:
材料科学
·
环境科学
·
光化学
·
催化
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DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 19
·9362-9368
·
IF 6.97
Peng-Fei Guo,Xi-Ming Wang,Meng-Meng Wang,Ting Yang,Ming-Li Chen,Jian-Hua Wang
Boron-titanate monolayer nanosheets were prepared through a scalable step by step intercalation approach for anchoring 3-mercaptopropyltriethoxysilane (MPTS) on the surface. MPTS provides clickable sites with 4-vinylphenylboronic acid (VPBA) via a thiol–ene (TE) click reaction to obtain monolayer titanate nanosheets with boronic acid ligands immobilized on the surface. The nanosheets obtained are denoted as VPBA-MPTS-TiNSs, with a lateral dimension of a few dozen nanometers and with a thickness of ca. 3.5 nm. The nanosheets exhibit a superior adsorption capacity of 1669.7 mg g−1 and favorable selectivity for the adsorption of glycoproteins by employing immunoglobulin G (IgG) as the protein model. The adsorbed IgG is thereafter readily collected by using 0.1% (m/v) cetane trimethyl ammonium bromide (CTAB) as the eluent. The practical applications of VPBA-MPTS-TiNSs are further demonstrated by the selective adsorption/purification of IgG from human serum.
研究领域:
材料科学
·
纳米技术
·
生物化学
·
蛋白质纯化
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2014
·
IF 6.007
Shifu Chen,Yingfei Hu,Sugang Meng,Xianliang Fu
The separation mechanisms of photogenerated electrons and holes for composite photocatalysts have been a research focus. In this paper, the composite g-C 3 N 4 -WO 3 photocatalysts with different main parts of C 3 N 4 or WO 3 were prepared by ball milling and heat treatment methods. The photocatalytic performance was evaluated by degradation of methylene blue (MB) and fuchsin (BF) under visible light illumination. The photocatalyst was characterized by X-ray powder diffraction (XRD), UV–vis diffuse reflection spectroscopy (DRS), transmission electron microscopy (TEM) and Brunauer–Emmett–Teller (BET) methods. The separation mechanisms of photogenerated electrons and holes of the g-C 3 N 4 -WO 3 photocatalysts were investigated by electron spin resonance technology (ESR), photoluminescence technique (PL), and determination of reactive species in the photocatalytic reactions. When the main part of the g-C 3 N 4 -WO 3 photocatalyst is WO 3 (namely g-C 3 N 4 /WO 3 ), the transport process of the photogenerated electrons and holes adopts the generic band–band transfer. Meanwhile, g-C 3 N 4 is covered by WO 3 powder, and the role of g-C 3 N 4 can not be played fully. The photocatalytic activity of the photocatalyst is not obviously increased. However, when the primary part of the WO 3 -g-C 3 N 4 photocatalyst is g-C 3 N 4 (namely WO 3 /g-C 3 N 4 ), the migration of photogenerated electrons and holes exhibits a typical characteristic of Z-scheme photocatalyst, and the photocatalytic activity of the photocatalyst is increased greatly.
研究领域:
材料科学
·
环境科学
·
光催化技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yanmei Xing,Liying Yin,Yingnan Zhao,Zhilu Du,Hua-Qiao Tan,Xing Qin,Wingkei Ho,Tianyu Qiu,Yang-Guang Li
The reasonable construction of heterojunction photocatalysts with clear nanostructures and a good interface contact especially the one-dimensional/two-dimensional (1D/2D) composite heterojunction with unique morphology is considered one of the most effective strategies for designing highly efficient photocatalysts. Herein, a series of the 1D β-keto-enamine-based covalent organic framework (COF)/2D g-C3N4 composite materials COF–CN (1:x; where 1:x represents the mass ratio of COF and g-C3N4, x = 2.5, 5, 10, 15, 20) is prepared through the in situ reaction of 2,4,6-triformylphloroglucinol (Tp) and benzidine (BD) in stripped g-C3N4 suspension. A series of characterizations, such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), have verified their 1D/2D heterojunction structure. With the introduction of 1D COF nanobelts, the absorption of the composite is largely extended to 560 nm. Photocatalytic experiments reveal that the composite COF/CN shows evidently superior photocatalytic performance than individual COF and g-C3N4. The optimized COF–CN (1:10) exhibits a H2 production rate of 12.8 mmol g–1·h–1 under visible-light (λ ≥ 420 nm) irradiation, which is about 62 and 284 times higher than those of COF and g-C3N4, respectively. The apparent quantum efficiency (AQE) of COF–CN (1:10) is about 15.09% under 500 nm light irradiation, which is one of the highest among previous COF- or g-C3N4-based materials. This work provides important strategies for designing and constructing high-efficiency heterojunction photocatalysts with multidimensional features.
研究领域:
材料科学
·
光化学
·
催化
·
纳米技术
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xinfei Zhang,Xiaobo Jia,Jianhui Zhan,Bin Han,Nan Zhang,Honghao Xie,Feilong Li,Yuan Zhang
The activation of peroxydisulfate (PDS) by g-C 3 N 4 -based catalysts has captured considerable interest; however, the oxidation prowess falls short of expectations, and the inherent processes remain enigmatic. Herein, a novel C C engineered g-C 3 N 4 (CCN) was successfully developed via a one-step thermal polymerization method for the activation of PDS. Our findings revealed that the CCN/PDS system selectively degraded various organic contaminants, operated effectively across a wide pH range (3−9), and maintained high performance in the presence of common water impurities. Experiments and theoretical calculations indicated that the electron transfer process (ETP) was the primary mechanism for phenol degradation. The introduction of C C led to charge redistribution and improved conductivity in g-C 3 N 4 . This enhancement strengthened PDS adsorption at electron-deficient carbon sites and bolstered electron transfer between PDS and organic contaminants. Moreover, a nonradical pathway predicated on ETP emerged when phenol, PDS, and CCN were present, propelled by differences in molecular orbital energies. This study not only deepens our understanding of PDS activation through the ETP but also introduces a novel strategy for the removal of organic contaminants from water.
研究领域:
环境科学
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材料科学
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化学工程
·
水处理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）