APPLIED CATALYSIS A-GENERAL
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2025
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IF 4.8
Yi Zhou,Wenfeng Zhao
Designing a low-cost and efficient photocatalytic system to produce high-valuable carbonates from the cycloaddition of CO 2 by using clean and renewable sunlight as the driving force shows great research potential. Here, a commercially available 4,4''-diamino-p-terphenyl (DT) was directly employed to promote the photocatalytic cycloaddition of CO 2 and various epoxides under visible light irradiation. As high as 95 % yield of target carbonate was obtained using blue LED (>450 nm) as a light source for 6 h under solvent-free/atmospheric CO 2 /room temperature conditions. Even under irradiation of natural light, a good yield of 68 % carbonate can also be achieved under ambient conditions. Moreover, in situ EPR and a series of controlled experiments were conducted to investigate the plausible photocatalytic mechanism, demonstrating that amino-containing DT with both π-π and p-π conjugated structure provides abundant basic sites and photogenerated electrons/holes as active sites for CO 2 activation and ring opening of epoxides at the same time.
研究领域:
化学
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环境科学
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材料科学
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DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2021
·Vol. 222
·期 10
·2000418
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IF 2.527
Haoting Zheng,Kun Wu,Weilong Chen,Bingfei Nan,Zhencai Qu,Mangeng Lu
A series of copolymers of poly3-alkylthiophene (PTm) with different side chain lengths and copolymers of 3-butylthiophene and 3-butoxythiophene (PTDx) with different ratios are synthesized by oxidative polymerization. As the length of the side chain decreases, WAXD patterns of PTm show an increase in crystallinity. An increment of 50% in thermal conductivity is observed and the maximum thermal conductivity reaches to 0.320 Wm –1 K –1 . For PTDx, as the proportion of 3-butoxythiophene increases, the UV spectrum appears red-shifted, indicating an enhanced degree of p-π conjugation. The thermal conductivity of PTDx is increased from 0.340 to 0.374 Wm –1 K –1 , which is around twice that of traditional thermoplastics. Molecular dynamics (MD) is used to simulate the changes in the volume and dihedral angle overlap of the polymer at different temperatures, and achieves the same result as the experiment. MD simulations and experimental measurements have shown that reducing steric hindrance and enhancing p-π conjugation can increase the thermal conductivity of the polymer. Young's modulus of PTDx (around 1.86 GPa) is lower than that of conventional plastics, and its flexibility makes it more versatile.
研究领域:
材料科学
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物理学
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DOI
高影响因子
Frontiers in Chemistry
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2021
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IF 5.221
Zhang Weibo,Chen Pinghua,Liu Jun,Huang NanNan,Feng Chenglian,Wu Daishe,Bai Yingchen
Modulating the structure of a photocatalyst at the molecular level can improve the photocatalytic efficiency and provides a guide for the synthesis of highly qualified photocatalysts. In this study, TiO2 was modified by various organic compounds to form different TiO2-based hybrid photocatalysts. 1,10-Phenanthroline (Phen) is an organic material with delocalized π-conjugated systems. It was used to modify TiO2 to form the hybrid photocatalyst Phen/TiO2. Furthermore, 1,10-phenanthrolin-5-amine (Phen-NH2) and 1,10-phenanthroline-5-nitro (Phen-NO2) were also used to modify TiO2 to form NH2-Phen/TiO2 and NO2-Phen/TiO2, respectively. The samples of TiO2, Phen/TiO2, NO2-Phen/TiO2, and NH2-Phen/TiO2 were carefully characterized, and their photocatalytic performance was compared. The results indicated that the photocatalytic efficiency followed the order of NH2-Phen/TiO2 > NO2-Phen/TiO2 > Phen/TiO2 > TiO2. It could be found that modifying TiO2 with different organic compounds containing delocalized π-conjugated systems could enhance the photocatalytic ability; furthermore, the level of this enhancement could be modulated by different delocalized π-conjugated systems.
研究领域:
材料科学
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化学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Yunpeng Xing,Sihao Zhi,Liang Zhao,Hongda Zhang,Chengchao Yu,Teng Fei,Sen Liu,Haiyan Zhang,Tong Zhang
The graphene-based room-temperature chemiresistive gas sensors have low sensitivity (especially for ppb-level organophosphorous compounds, OPCs), limiting their practical applications. Herein, a novel coupling single-atom Cu and N-enriched, π-conjugated carbon nanodots (NCDs) strategy is proposed to synthesize graphene-based sensing materials with excellent room-temperature DMMP sensing performances. Taking rGO-NCDs-Cu as the example, the N-enriched structures facilitate the adsorption of DMMP by providing more active sites and strengthening the hydrogen bonding interactions between -NH 2 and DMMP molecules. The π-conjugated structures can construct large π-delocalization network promoting charge generation and transport. The N-enriched and π-conjugated structures also result in narrowing band gap of NCDs, effectively enabling the increase of carrier transfer rate. Moreover, the introduction of single-atom Cu sites with Cu-N 2 Cl 2 structure further strengthens the hydrogen bonding interactions between sensing materials and DMMP molecules. Benefiting from this novel coupling strategy, rGO-NCDs-Cu sensor shows high response value of 13.95 % towards 340 ppb DMMP at room temperature. Meanwhile, rGO-NCDs-Cu sensor exhibits short response time (77 s) and recovery time (198 s), low practical limit of detection (34 ppb), excellent repeatability and high selectivity. Our work offers a new strategy for rational design of graphene-based materials for detection of OPCs at room temperature.
研究领域:
材料科学
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化学传感器
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环境监测
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Chuanhong Wang,Jun Yan,Zhongcheng Ma,Zhonggang Wang
Separation of ethylene (C 2 H 4 )/ethane (C 2 H 6 ) is important yet extremely challenging task in petrochemical industry. Herein, three microporous polymers decorated with phenyls (PAN-P), naphthyls (PAN-NA) and anthryls (PAN-AN) were designed and synthesized in order to systematically study the correlations of the varied π-conjugation structure to the selective adsorptions of C 2 H 6 over C 2 H 4 . The adsorption–desorption isotherms of C 2 H 6 and C 2 H 4 in the three polymers are completely reversible at room temperature. Moreover, it is interesting to find that at 298 K, among the three polymers, PAN-AN with the largest π-conjugation anthryl groups exhibits the highest C 2 H 6 /C 2 H 4 dynamic selectivity of 2.70. The different adsorption/separation behaviors of C 2 H 6 /C 2 H 4 in the three polymers are studied by means of the varied π-conjugation microenvironments as well as the porous characteristics such as specific surface areas, pore volumes and pore sizes and distribution.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
Inorganic Chemistry Frontiers
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2024
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IF 6.1
Cheng Chen,Danyang Dou,Yunjie Bai,Bingbing Zhang,Ying Wang
The investigation of birefringent materials is predominantly focused on π-conjugated systems; however, a large band gap or deep ultraviolet (DUV) transmittance cannot be guaranteed. In this work, we propose an extended π-conjugated strategy to increase the birefringence while keeping the large band gap. In the scheme, two new fluoroaluminoborates, BaAlB3O6F2 and BaAl2(B3O6)2F2, are synthesized by combining the [BO3] group with the [AlO4F2] group and the [B3O6] group with the [AlO3F] group through a rational structural design. The experimental results indicate that both BaAlB3O6F2 and BaAl2(B3O6)2F2 exhibit shorter UV cutoff wavelengths (<200 nm) and larger birefringence (Δn > 0.07@546 nm). Notably, this is a new finding in the Ba–Al–B–O–F system since the discovery of the well-known nonlinear optical crystal BaAlBO3F2. In comparison with BaAlBO3F2, BaAlB3O6F2 and BaAl2(B3O6)2F2 exhibit a markedly elevated birefringence (0.0418 vs. 0.087/0.105 at 546 nm). Furthermore, BaAl2(B3O6)2F2 exhibits the largest band gap (7.87 eV) of all known F-containing aluminoborates. This work not only identifies two potential DUV birefringent materials, but also proposes a novel design approach for reconciling the conflicting properties between birefringence and bandgap.
研究领域:
材料科学
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光学
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DOI
高影响因子
Journal of Coatings Technology and Research
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2025
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IF 2.8
Tang Baoling,He Ziyu
The commonly used dispersants for graphene dispersions reduce the conductivity of the composite. In this work, a dispersant with an amphiphilic structure, CA-g-PANI, has been designed and synthesized. The dispersant grafts citric acid (CA) onto polyaniline via an amide reaction, which gives CA-g-PANI the hydrophilic groups (carboxyl groups) and the benzene ring structures that can be π–π conjugated with graphene, and it can improve the dispersion properties of graphene; CA-g-PANI contains the polyaniline structure, which is electrically conductive and enhances the electrical conductivity of graphene dispersions. The molecular structure and properties of the dispersant were systematically characterized through FTIR spectra, UV absorption spectra, and other methods. The graphene-based composites were prepared by screen printing method, and the dispersibility and resistivity of CA-g-PANI were compared with gum arabic and alkali lignin (natural dispersants). Graphene concentration reached up to 30 mg/mL in the presence of CA-g-PANI at the weight ratio of 1:0.03 (CA-g-PANI: graphene). CA-g-PANI also exhibited good performance for stabilizing graphene (stable for 6 days), with an electrical conductivity of up to 917.43 S/m. In the study, it was shown that CA-g-PANI as a graphene dispersant improved the conductivity of graphene dispersions while enhancing the dispersing properties of graphene.
研究领域:
材料科学
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化学工程
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纳米技术
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Yachao Xu,Hongsen Zhang,Qi Liu,Jingyuan Liu,Rongrong Chen,Jing Yu,Jiahui Zhu,Rumin Li,Jun Wang
It is still a challenge to obtain uranium (U) adsorbents with high selectivity , excellent cycle stability and excellent performance through design and synthesis. In this paper, the TiO 2 /CPAN-AO catalyst was prepared by the hydrothermal method combined with high temperature cyclization dehydrogenation . TiO 2 /CPAN-AO has excellent photocatalytic properties, which can reduce U(VI) to U(IV) quickly and selectively. The generated Z-type heterojunction promotes the reduction ability of photogenerated electrons, and obtains great selectivity to UO 2 2+ (Uranyl ions) through the AO group. TiO 2 /CPAN-AO with π-electron conjugated structure broadens the spectral range through surface hybridization and prolongs the lifetime of photo-generated charges. Under the induction of light, the uranium extraction capacity of TiO 2 /CPAN-AO after 5 h of irradiation is about 2.38 g/g. TiO 2 /CPAN-AO is a catalyst with enhanced adsorption capacity, making it possible to extract uranium from large-scale natural seawater in the future.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
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IF 4.5
Xiaoxi Li,Jiajia Li,Dilnur Kurbanjan,Tianhao Yu,Hong Du
Zeolite imidazole frameworks (ZIFs) structures are widely used as an efficient catalyst for metal organic frameworks (MOFs) in electrocatalysis. In this work, the structure of the trimetallic ZIFs sample was rationally designed by the method of doping with Ni 2+ and Zn 2+ . After that, a layer of highly conductive π-π conjugated organic molecules was wrapped on the trimetallic ZIFs sample to form a heterojunction structure of NiZnCo-ZIF@HHTP composite. The activity of oxygen evolution reaction (OER) of NiZnCo-ZIF was improved after it was combined with HHTP. NiZnCo-ZIF@HHTP presents a low overpotential (η ≈ 193 mV @10 mA cm −2 ), a small Tafel slope (97.4 mV dec −1 ) and outstanding stability for OER in 1 M KOH solution. The superior OER performance of NiZnCo-ZIF@HHTP is due to the effect of doping of Ni and Zn to form a trimetallic ZIF material. The synergistic effect of Ni Zn codoped enhances the conductivity of ZIF-67 material. Meanwhile, the π-π conjugation effect of HHTP organic macromolecule can further enhance the electrical conductivity of NiZnCo-ZIF. The result suggests that the co-doping of polymetallic cations and the coating of conducting organic molecules can be vital for modifying ZIFs electrocatalysts. This work provides a meaningful reference value for modifying non-precious metal ZIFs materials in electrocatalysis.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
LANGMUIR
·
2023
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IF 3.9
Wei Yang,Yanhua Gao,Mingli Cao
The enhanced photocatalytic properties of Z-Scheme Bi@BiOCl/C3N4-DPY heterojunction materials were successfully prepared by the ultrasonic-assisted coprecipitation method. The Bi@BiOCl/C3N4-DPY heterojunction exhibited remarkable photocatalytic activity under visible light irradiation, and the degradation rate of methyl orange (MO) was about 90.6% in 180 min. This impressive efficiency is mainly due to the Z-Scheme charge transfer mechanism in Bi@BiOCl/C3N4-DPY, resulting in the efficient separation of charge carriers and an increase in the REDOX potential of photogenerated electrons and holes. C3N4 was modified with a π-deficient conjugated pyridine ring, which caused the light absorption redshift, promoted the formation of oxidizing •O2–, and improved the photocatalytic activity. At the same time, a well-aligned heterojunction is formed at the interface between C3N4-DPY and BiOCl, facilitating the seamless transfer of light-induced electrons from the LUMO of C3N4-DPY to the CB of BiOCl. In addition, the addition of Bi introduces a unique band gap reduction effect, resulting in a change in the density of the band states, which further promotes charge transfer and separation. It is worth noting that the introduction of metallic bismuth (Bi) brings about a unique band gap reduction effect, resulting in a change in the density of states within the band, which ultimately promotes charge transfer and separation. The Z-scheme charge migration inside Bi@BiOCl/C3N4-DPY further promotes the efficient separation of photogenerated electron–hole pairs, greatly improving the overall efficiency of the material. The Z-structured photocatalyst developed in this study has great application potential in various fields of photocatalysis.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2025
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IF 6.7
Ruonan Jiang,Zhenzhen Cai,Huazangnaowu Bai,Yali Liu,Baiyi Zu,Xincun Dou
The precise modulation of the π-conjugated bridge within a probe is of considerable importance for the development of reaction-based fluorescent probes endowed with specific functionalities. Here, a series of naphthalimide-based fluorescent probes with a fluorescence ratio and attenuated sensing properties for H2O2 have been designed by precisely tuning the type of the π-conjugated bridge located between the boric acid recognizing the moiety and the naphthalimide fluorophore. The modulation of the π-conjugated bridge species mainly focused on three structural units, thiophene, benzene, and furan, among which the thiophene helped us to construct the most efficient naphthalimide-based fluorescent probe (E)-(5-(((2-(2-mercaptoethyl)-1,3-dioxo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino)methyl)thiophen-2-yl)boronic acid (MOHB-IMTP). It demonstrated the most remarkable fluorescence changes before and after the reaction and thus a significantly superior sensing performance for H2O2, including fairly good selectivity and a lower limit of detection (LOD, 38.5 nM). In addition, based on cellulose-induced aggregation of the reaction products, the MOHB-IMTP/cellulose probe was further developed and proven to have a faster and more sensitive (4.0 nM) detection toward H2O2. We postulate that this π-conjugated bridge modulation and cellulose signal enrichment strategy will actively promote the development of high-performance fluorescent probes and sensing devices.
研究领域:
分析化学
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生物传感
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材料科学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
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IF 3.99
Kaili Yao,Yi Liu,Huan Yang,Jingyou Yuan,Shaoyun Shan
In this study, a polyaniline-modified 3D-spongy SnS photocatalyst (PANI/SnS) has been prepared using an in-situ oxidative polymerization technique for the enhanced photocatalytic degradation of methyl orange. PANI/SnS reached to a rate constant of 4.040 × 10 −2 min -1 > 2 times of that pure SnS and maintained a good stability after four cycling runs for methyl orange degradation. The better photocatalytic activity and stability of PANI/SnS catalyst were ascribed to the π-conjugated structure characteristic of PANI and the interaction between PANI and SnS. On the one hand, induced π-conjugated electrons transferred from PANI to SnS could effectually inhibite the electrons and holes recombination. On the other hand, the presence of C–S and Sn-N bonds between PANI and SnS could protect the S and/or Sn element from direct exposure to the corrosive environment, then restraining photocorrosion behavior. This study implies that conductive conjugated polymer (PANI) modified tin sulfide will be a potential reusable and stable photocatalyst for methyl orange removal from waste-water by photocatalysis .
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
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