JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2020
·
IF 3.306
Yuhang Chen,Jie Zhang,Zhiyong Tang,Yuhan Sun
The 2-phenylethanol production by traditional chemical methods requires multi-step reactions, in which harsh conditions such as high temperature or strong acid/base are required and undesired by-products are easily produced. The visible light catalyzed anti-Markovnikov hydration of styrene is a single-step reaction using non-toxic catalyst under mild conditions. However, this reaction usually takes ten or even dozens of hours, facing the problem in scale up. The present work aims to intensify this reaction in continuous flow microreactor with comparison to traditional batch reactor. The effects of light source shape, reaction temperature, substrate concentration and catalyst concentration on the reaction were investigated. The continuous flow microreactor permitted to ensure more uniform light intensity and larger specific surface area, the reaction rate could thus be enhanced. The maximum productivity of 2-phenylethanol was 0.122 mol/(L.h), which was 2.5 times higher than that obtained in test tube under the same reaction conditions and 34 times higher than that reported in previous literature. The optimal photosensitizer concentration was 2 %. The increase of substrate concentration would lead to the addition reaction between styrene cationic intermediates with styrene, thereby decreasing the selectivity of 2-phenylethanol.
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ACS Nano
·
2025
·
IF 16
Yuan-Hang Wu,Yang Shen,Bing-Feng Wang,Yu-Tong Wang,Shi-Chi Feng,Yi Yu,Yu-Hang Zhang,Zhenhuang Su,Xingyu Gao,Yanqing Li,Jian-Xin Tang
Efforts to improve the performance of perovskite light-emitting diodes (PeLEDs) have predominantly centered on two key strategies: defect passivation and phase modulation, both of which aim to mitigate nonradiative recombination. While recent advances have explored the synergistic mechanisms in multiadditive systems, the inherent multifunctionality of single-additive systems remains underexplored. Here, we investigate a biopharmaceutical agent, ambroxol hydrochloride (AMB), with multifunctional groups as a multifunctional perovskite crystallization regulator. The presence of abundant electron-rich moieties (e.g., −OH and −NH2) facilitates efficient passivation of perovskite grain boundaries via multiple coordination bonds (e.g., O:Pb and N:Pb). These functional groups also exhibit a strong propensity to form hydrogen bonds with halogen ions, thereby effectively suppressing the formation of halogen vacancies and inhibiting ion migration. Furthermore, AMB impedes the adsorption of the spacer molecule phenylethylamine (PEA) on the octahedron surface and competes with PEA for coordination sites, thereby promoting the formation of well-aligned layered phases and enhancing exciton transfer efficiency. Consequently, we obtained spectrally stable sky-blue PeLEDs with a high external quantum efficiency of 22.42%. High-quality active-matrix array displays are further demonstrated, achieving precise independent control of each pixel. These displays exhibit superior brightness and color consistency, making them highly promising for advanced optoelectronic applications.
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DOI
PubMed
高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Hui-Lian Zhou,Ya-Yang He,Yong Wang,Cheng-Yang Zhou,Hong-Wei Hu,Yun Zhang,Guang-Gui Cheng
All-inorganic lead bromide perovskite CsPbBr3 has garnered considerable attention due to its high thermal stability and rapid radiative recombination. Unfortunately, it is still a big challenge to further improve the efficiency and stability of the CsPbBr3 film via the solution processing technique. In this study, we report a method to enhance the CsPbBr3 film quality via annealing at a low temperature of 38 °C. The low-temperature annealing slows the phase transition, allowing for the orderly arrangement of crystal orientations and a surface with fewer defects. With this method, the fabricated CsPbBr3 PeLED exhibits great stability and bright luminescence, achieving an external quantum efficiency (EQE) of 8.21%. The PeLEDs fabricated at 38 °C demonstrated a low turn-on voltage of 1.5 V, with high current densities of 66.8 mA/cm2 at 2.0 V and 371 mA/cm2 at 3.0 V. These results provide valuable insights for the realization of high-efficiency and high-stability PeLEDs for lighting and display applications.
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DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Yongzhi Tu,Ziming Zhang,Peien Huang,Jiale Zou,Zhi Xiong,Meiting Zheng,Zhifei Ma,Jianxin Chen
Unlike conventional Fe₃O₄-MnO₂ composites, an architecture-engineered Fe₃O₄-MnO₂ (FM-21) heterostructure was constructed by anchoring Fe₃O₄ nanoparticles onto α-MnO₂ nanorods. Under visible light irradiation, the FM-21/PDS system achieves 96.5 % Orange II degradation within 60 min with a kinetic rate constant of 0.0596 min −1 , significantly outperforming its individual components and dark condition controls. Multiple characterization techniques confirm that the unique interfacial configuration establishes a direct Z-scheme charge transfer pathway, substantially enhancing charge carrier separation efficiency. XPS analysis provides direct evidence that visible light accelerates the co-cycling of Fe 3+ /Fe 2+ and Mn 4+ /Mn 3+ redox pairs, thereby maintaining highly efficient PDS activation. Quenching experiments and EPR analysis further reveal that the synergistic effect between radical and non-radical pathways, which is dominated by singlet oxygen ( 1 O₂) and holes (h + ), drives the degradation process. This mechanism enables the degradation of various pollutants with minimal dependence on their charge characteristics, demonstrating the catalyst's broad applicability. The catalyst also exhibits practical advantages including magnetic separability and stable performance over five consecutive cycles. This study demonstrates that the synthesized FM-21 exhibits significant potential for visible light-enhanced PDS activation in eliminating recalcitrant organic pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Gongduan Fan,Xia Li,Jiuhong Lin,Xinyi Wu,Ling Zhang,Jiaxin Wu,Yingmu Wang
In this work, a facile separation of self-floating Ag 3 VO 4 /BiVO 4 hydrogel (ABVH) photocatalyst was constructed via the freeze-thaw method for the inactivation of Microcystis aeruginosa . The as-synthesized photocatalyst exhibited excellent photocatalytic performance, resulting in the degradation efficiency of chlorophyll a reaching approximately 99.6% within 4 h under visible light. The cell morphology, intracellular organic matter (IOM), extracellular organic matter (EOM), and antioxidant system were severely disrupted during the photocatalytic process. The inactivation mechanism could be ascribed to the ·OH and h + generated by hydrogel photocatalyst under visible light irradiation. Furthermore, five repetitive experiments and cyclic compressive stress-strain tests demonstrated that the as-prepared hydrogel possessed excellent reusability and mechanical strength properties. Besides, the hydrogel photocatalyst showed excellent potential for the removal of M. aeruginosa in the presence of natural organic matter (NOM). Overall, the synthesized self-floating hydrogel photocatalyst may offer a novel insight into the control of harmful cyanobacterial blooms.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yun Zheng,Lili Zhang,Yuke Li,Yayun Wang,Jingling Chen,Bizhou Lin,Yanzhen Zheng,Lin Cheng,Sibo Wang,Yilin Chen
Polymeric carbon nitride (CN) has evoked considerable attention in photocatalysis, however, its π-deficiency conjugated frameworks engendering weak visible-light absorption and rapid charge recombination hinder the practical utilizations. Herein, a novel donor–acceptor (D-A) conjugated polymer based on triptycene incorporated carbon nitride ( T -CN) has been facilely prepared by thermal copolymerization of melamine and 2,6,14-triaminotriptycene. Combined with the density functional theory (DFT) calculations, it is found that the formation of intramolecular charge transfer and the extended π-conjugative effect in the D-A structure contribute to a broadened light-harvesting spectral range, a higher charge separation/transfer efficiency and more active sites of T -CN for photoredox reactions. The T -CN catalyst accomplished superior visible-light photocatalytic performance in both hydrogen evolving and carbon dioxide reduction. The optimal T -CN catalyst exhibited the highest hydrogen evolution rate of 80.9 ± 1.3 μmol·h −1 and carbon monoxide production rate of 8.1 ± 0.2 μmol·h −1 , which are ca. 8-fold and 20-fold of bulk CN, respectively. The convenient strategy of constructing D-A conjugated structure opens up a new intriguing avenue toward the rational creation of efficient polymeric nanomaterials for versatile applications of solar fuel production.
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DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 46
·39810-39817
·
IF 3.289
Yifan Jiang,Juncheng Hu,Jinlin Li
Tin-doped Bi2S3 (TDB) microspheres assembled by nanosheets with different Sn contents were synthesized via a simple one step solvothermal method. These photocatalysts were characterized by XRD, SEM, TEM, BET, XPS and DRS. The results showed that the TDBs with a portion of Sn4+ substitution at Bi3+ sites in Bi2S3 lattice were consist of nanosheets, Sn dopant can increase the specific surface area and range of light response. What's more, the possible formation mechanism of the unique structure was discussed. It exhibits that the introduction of Sn can improve the photocatalytic activity, and 3 mol% is the optimal content of doped Sn for the degradation of RhB under visible light (λ > 420 nm) irradiation. Compared to the un-doped Bi2S3, the enhanced photocatalytic activities of the TDBs might be attributed to the photo-generated electrons and holes recombination were prevented by doping Sn. The EIS measurements further confirmed the better photogenerated charge carrier separation and transport efficiency of TDBs samples. Moreover, the possible mechanism of photocatalysis process and the possible active species were investigated in detail. This photocatalyst also showed good reusability during the recycled experiments.
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Polymer Chemistry
·
2017
·Vol. 8
·期 9
·1579-1588
·
IF 5.375
Zhiquan Li,Weizhen Shen,Xiaoya Liu,Ren Liu
Simultaneous thiol-based hybrid photopolymerization is an efficient and versatile tool to prepare interpenetrating polymeric networks. A highly active photoinitiator is essential for an efficient simultaneous hybrid reaction. In this paper, several unimolecular photoinitiators, which contain thioxanthone derivatives as chromophores as well as free radical generators, and 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) as a latent alkaline species, were straightforwardly prepared in two steps. The photolysis study indicated that under 405 nm LED light irradiation, the photoinitiators can produce free radicals and a strong base simultaneously via a photodecarboxylation mechanism. The generated active species are highly efficient in catalyzing thiol–yne–epoxy hybrid polymerization without post-exposure baking and the properties of the hybrid network can be tailored by adjusting the compositional ratios of the formulations. The photocured materials using unimolecular photoinitiators exhibit superior thermal and mechanical properties compared to those prepared using a bimolecular initiation system from the literature. The presented strategy to realize simultaneous thiol–yne–epoxy hybrid photopolymerization shows potential for the fabrication of optical devices with enhanced refractive index and improved mechanical properties.
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高影响因子
Nanoscale
·
2013
·Vol. 5
·期 20
·9764-9772
·
IF 6.233
Dongfang Hou,Xianluo Hu,Pei Hu,Wei Zhang,Mingfei Zhang,Yunhui Huang
A novel p–n junction photocatalyst of Bi4Ti3O12 nanofibers–BiOI nanosheets has been fabricated through a simple and economical technique of electrospinning combined with a successive ionic layer adsorption and reaction (SILAR) process. The products are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectra (DRS), and photoluminescence (PL) spectroscopy. The as-formed Bi4Ti3O12 nanofibers are composed of inter-linked nanoparticles of 50–80 nm in size. The thickness of the as-grown BiOI nanosheets is about 10 nm and the size of the BiOI nanosheets increases with the SILAR cycles. In particular, many {001} facets of BiOI nanosheets are exposed, which is favorable to enhance the visible-light photocatalytic activity. The p–n junction photocatalyst exhibits enhanced visible-light-driven photocatalytic activity for decomposition of rhodamine B (RhB) and phenol. The enhanced photocatalytic activity can be attributed to the extended absorption in the visible light region resulting from the BiOI nanosheets and the effective separation of photogenerated carriers driven by the photo-induced potential difference generated at the Bi4Ti3O12–BiOI p–n junction interface.
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Nanoscale
·
2013
·Vol. 5
·期 5
·2028-2035
·
IF 6.233
Dongfang Hou,Wei Luo,Yunhui Huang,Jimmy C. Yu,Xianluo Hu
Bi4Ti3O12 nanofibers with diameters of 50–100 nm have been fabricated for the first time through a simple and economical technique of electrospinning combined with subsequent calcination. The as-formed Bi4Ti3O12 nanofibers are porous and composed of inter-linked nanoparticles of 30–50 nm in size. They exhibit both enhanced visible-light-driven photocatalytic decomposition of rhodamine B (RhB) and favorable recycling capability. It is attributed to not only the macrostructure, such as the morphology, surface texture, and grain shape, but also the intrinsic structures of oxygen vacancies and surface adsorbed oxygen.
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高影响因子
FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 2
·345-353
·
IF 2.153
Liu Jun,Sun Meng,Chang Meng-Jie,Fan Si-Meng,Hui Qian,Ni Fu-Rong,Yuan Bin
Novel CoFe 2 O 4 /MIL-100(Fe) (CFO/MIL-100(Fe)) core/shell nanofibers were prepared by successive ionic layer adsorption and reaction (SILAR) assembly of MIL-100(Fe) on electrospun CoFe 2 O 4 nanofibers. The MIL-100(Fe) shells were constructed on the dispersed CoFe 2 O 4 fiber surface with high uniformity, homogeneous thickness and high stability. Due to the inherent porosity of MIL-100(Fe), a higher specific surface area of 225.77 m 2 /g is achieved for the CFO/MIL-100(Fe)-10 sample. The formed CFO/MIL-100(Fe) catalysts exhibit high catalytic activity towards degradation of rhodamine B (RhB) under visible light irradiation. The photocatalytic activity remains above 77 % within 60 min illumination after four cycles. Due to the simple synthetic method, highly uniform structure, strong magnetic recoverable, as well as good photocatalytic performance, the obtained CFO/MIL-100(Fe) core/shell nanofibers could be promising photocatalysts for practical application.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Haixin Zhao,Shu Cui,Lan Yang,Guodong Li,Nan Li,Xiaotian Li
Photocatalysts with a hierarchically porous structure have attracted considerable attention owing to their wide pore size distribution and high surface area , which enhance the efficiency of transporting species to active sites. In this study, hierarchically meso-macroporous TiO 2 photocatalysts decorated with highly dispersed CdS nanoparticles were synthesized via hydrolysis, followed by a hydrothermal treatment . The textural mesopores and interconnected pore framework provided more accessible active sites and efficient mass transport for the photocatalytic process. The light collection efficiency was enhanced because of multiple scattering of incident light in the macropores. Moreover, the formation of a heterojunction between the CdS and TiO 2 nanoparticles extended the photoresponse of TiO 2 to the visible-light range and enhanced the charge separation efficiency. Therefore, the hierarchically meso-macroporous TiO 2 /CdS photocatalysts exhibited excellent photocatalytic activity for the degradation of rhodaming B under visible-light irradiation. Trapping experiments demonstrated that superoxide radicals ( O 2 − ) and hydroxyl radicals ( OH) were the main active species in photocatalysis . A reasonable photocatalytic mechanism of TiO 2 /CdS heterojunction photocatalysts was also presented.
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