EUROPEAN POLYMER JOURNAL
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2023
·
IF 6
Kun Liu,Qiaoqiao Xiong,Zhuowei Gu,Feng Zhang,Yawen Fu,Fengli Xie,Wenjun Yi,An Li,Jundong Xu,Lijun Li
Visible light-mediated photoinduced reversible addition-fragmentation chain transfer polymerization (RAFT) copolymerization of 1,3-pentadiene isomers and maleic anhydride (MAH) in the absence of photocatalysts or photoinitiators was realized in tetrahydrofuran (THF) solvent at r.t. under various visible wavelengths. The well-defined alternating copolymers were successfully and efficiently synthesized by directly using O -ethyl- S -benzoic thioanhydride ( EBT ) as chain transfer agent activated by blue light (460 nm). The conventional thermal-initiated radical copolymerization of 1,3-pentadiene (PD) isomers (except cis -1,3-pentadiene (CP)) and MAH gave both DA cycloaddition products and alternating sequence copolymers. In contrast, the alternating copolymer was the only isolated product in this photoinitiated polymerization system, in which the DA reaction was completely suppressed. Moreover, both trans -1,3-pentadiene (TP) and PD isomers can be copolymerized with MAH to give alternating copolymers with high yields up to 100%, although the photopolymerization rates are in the order: PD > CP > TP. And the copolymerization can be implemented by simply switching the light source ON/OFF. We supposed that the donor–acceptor interaction between the PD and MAH (similar to St (styrene)/MAH system) plays an important role in this novel light-induced RAFT alternating copolymerization behavior.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Nan Ma,Zongjie Zhang,Wei Li,Xiaoyong Huang
Bright cyan-emitting phosphor is indispensable to fill the cyan gap for the fabrication of full-visible-spectrum warm-white light-emitting diodes (LEDs) with high color rendering index (CRI). In this study, we demonstrate a novel efficient cyan-emitting Ce 3+ -activated CaLu 2 HfScAl 3 O 12 (CLHSA) garnet phosphor for application in blue-light-excited full-spectrum warm-white LEDs. CLHSA:Ce 3+ phosphors show broadband excitation spectra in the 300–470 nm spectral range with a maximum peak at 408 nm, indicating they can be efficiently pumped by the blue LED chips. The optimal doping concentration of Ce 3+ ions is found to be 1 mol%. Upon 408 nm excitation, the optimal CLHSA:1%Ce 3+ phosphor gives rise to a bright broadband cyan emission (peak position: 498 nm; bandwidth: 97.5 nm) with CIE chromaticity coordinates of (0.2196, 0.4265) and high photoluminescence quantum yield of 64.5%. Finally, we have fabricated a blue-light-excited high-CRI warm-white LED device by employing the CLHSA:1%Ce 3+ cyan phosphor, commercial YAG:Ce 3+ yellow phosphor and commercial CaAlSiN 3 :Eu 2+ red phosphor as well as a 450 nm LED chip, which demonstrates a bright warm-white light emission with a high CRI (Ra = 92.6), a low correlated color temperature (3660 K), and good CIE chromaticity coordinates of (0.3993, 0.3939) as well as a high luminous efficacy of 45 lmW −1 . Therefore, this newly discovered efficient cyan-emitting CLHSA:1%Ce 3+ phosphor is promising for application in blue-chip-pumped full-visible-spectrum warm-white LEDs with high CRI values.
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RSC Advances
·
2023
·Vol. 13
·期 51
·36477-36483
·
IF 3.9
Jian Li,Renkun Huang,Lu Chen,Yuzhou Xia,Guiyang Yan,Ruwen Liang
The construction of heterojunctions has been used to optimize photocatalyst fuel denitrification. In this work, HKUST-1(Cu) was used as a sacrificial template to synthesize a composite material CuxO (CuO/Cu2O) that retains the original MOF framework for photocatalytic fuel denitrification by calcination at different temperatures. By adjusting the temperature, the content of CuO/Cu2O can be changed to control the performance and structure of CuxO-T effectively. The results show that CuxO-300 has the best photocatalytic performance, and its denitrification rate reaches 81% after 4 hours of visible light (≥420 nm) irradiation. Through the experimental analysis of pyridine's infrared and XPS spectra, we found that calcination produces CuxO-T mixed-valence metal oxide, which can create more exposed Lewis acid sites in the HKUST-1(Cu) framework. This leads to improved pyridine adsorption capabilities. The mixed-valence metal oxide forms a type II semiconductor heterojunction, which accelerates carrier separation and promotes photocatalytic activity for pyridine denitrification.
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 15
·5917
·
IF 4.6
Lei Zhao,Dong Zhang,Xin Wang,Yang Li,Zihan Li,Hua Wei,Boxuan Yao,Gongtao Ding,Zifan Wang
The emergence and fast development of carbon dots (CDs) provide an unprecedented opportunity for applications in the field of photoelectricity, but their practicability still suffers from complicated synthesis procedures and the substrate dependence of solid-state fluorescence. In this study, we design a unique microwave-assisted solid-phase synthesis route for preparing tunable fluorescent CD powders with yellow, orange, and red fluorescence (Y-CDs, O-CDs, R-CDs) by simply adjusting the mass ratio of reactants, a method which is suitable for the large-scale synthesis of CDs. The Y-/O-/R-CDs were systematically characterized using physics and spectroscopy techniques. Based on the perfect solid-state fluorescence performance of the proposed fluorescent CD powders, the Y-/O-/R-CDs were successfully applied for the construction of multi-color and white light-emitting diode devices at low cost. Furthermore, the Y-CDs displayed much higher yield and luminous efficiency than the O-CDs and R-CDs and were further used for fingerprint identification on the surfaces of glass sheets and tinfoil. In addition, the R-CD aqueous solution fluorescence is sensitive to pH, suggesting its use as a pH indicator for monitoring intracellular pH fluctuations. The proposed series of fluorescent powders composed of CDs may herald a new era in the application of optical components and criminal investigation fields.Keywords:tunable carbon dots;large-scale synthesis;solid-phase synthesis;light-emitting diodes;fingerprint identification
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Juying Li,Ying Liu,Yiqian Song,Li Cao,Yezhi Dou,Jia Yu,Yueqing Zhang,Jian He,Wei Dai,Cheng Yao,Deyang Kong
Due to the high toxicity, persistence and resistance of perfluorooctanoic acid (PFOA), developing convenient and efficient methods to degrade such highly recalcitrant contaminants is urgently needed. Herein, a visible light-responsive semiconductor carbon nitride (CN) was introduced to realize enhanced degradation of PFOA by providing the strong oxidizing radical •OH. In this study, 365 nm UV light and 456–760 nm visible light were applied as two comparable light sources, highlighting the fact that under simple visible light irradiation, both the degradation rate and defluorination rate of PFOA ultimately reached over 95 % with the aid of the Fe 3+ /CN system in at most 70 h. In addition, possible influencing factors, including the dosage of ferric ions (varying from 0–0.01 mol/L), the contaminant itself (ranging from 20 μg/L to 5 mg/L) and semiconductor CN (5–20 mg/L), were also investigated, and an accelerated reaction mechanism was proposed. Our results shed light on the most recent development of effective and sustainable technologies for PFOA breakdown in the environment.
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ACS Catalysis
·
2023
·
IF 12.9
Mei Li,Zhenyang Zuo,Shengbo Zhang
Developing effective photocatalysts for CO2 reduction to high value-added chemicals or fuels is a promising strategy for alleviating serious environmental problems and energy crisis. Currently, the photocatalytic efficiency is still too slow to arouse industrial interest for most semiconductor photocatalysts due to their low CO2 uptake, limited visible light capture capacity, and serious recombination of electron–hole. Herein, we successfully synthesized a high-density ultrafine Au cluster (∼0.7 nm)-doped cobalt-layered double hydroxide nanocage (Au/Co-LDH) photocatalyst through an in situ redox strategy to explore the structure–activity relationship in the CO2 reduction system. A series of experimental characterizations showed that CO2 adsorption, visible light capture capacity, and charge transfer rate are significantly enhanced due to the highly dispersed and ultrafine Au cluster doping. Density functional theory calculations indicate that Au doping also promoted charge redistribution at the active site, increased the density of states near the Fermi energy level, stabilized the *COOH intermediate, and reduced the energy barrier of the rate-determining step. As a result, Au/Co-LDH delivers a CO evolution rate of 5610 μmol g–1 h–1 toward CO2 reduction under visible light (λ > 420 nm), which is 4 times and 22 times more active than the undoped one and Au nanoparticles, respectively. We believe that this work will provide an important implication for the development and optimization of photocatalysts for CO2 reduction.
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BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Jiayi Zheng,Liheng Chen,Xueqing Qiu,Yingchun Liu,Yanlin Qin
Lignin is the most abundant natural phenolic polymer. However, the severe condensations of industrial lignin resulted in an undesirable apparent morphology and darker color, which hindered its application in the field of daily chemicals. Therefore, a ternary deep eutectic solvent is used to obtain lignin with light-color and low condensations from softwood. The results showed that the brightness value of lignin extracted from aluminum chloride-1,4-butanediol-choline chloride at 100 °C and 1.0 h was 77.9, and the lignin yield was 32.2 ± 0.6%. It is important that 95.8% of β-O-4 linkages (β-O-4 and β-O-4′) was retained. Lignin is used to prepare sunscreens and is added to physical sunscreens at 5%, with SPF up to 26.95 ± 4.20. Meanwhile, enzyme hydrolysis experiments and reaction liquid composition tests were also conducted. In conclusion, a systematic understanding of this efficient process could facilitate high-value utilization of lignocellulosic biomass in industrial processes.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 33
·2302038
·
IF 19
Hui Liu,Huan Luo,Jianying Huang,Zhong Chen,Zhihua Yu,Yuekun Lai
An intelligent fiber actuator that can sense, adapt, and interact with environmental stimuli is highly desirable for numerous applications. However, conventional fiber sensors have difficulty in responding to complex environments with fast sensing and actuation. Herein, water/light dual-responsive double-twisted RGO@HHF (hollow hydrogel fiber loaded with reduced graphene oxide) actuators are successfully developed based on dynamic self-contraction/elongation via twisting, folding, plying, and re-plying process. Under stimuli by water and light, the twisted RGO@HHF provides a forward and reverse torsional stroke of 3168 and 60° cm −1 , respectively. The excellent swelling properties endow the fiber with highly effective water-responsive ability, and the hollow structure can reduce the water required for fiber to swell. Meanwhile, the RGO loading further accelerates water evaporation and enhances the light response rate of the fiber. After twisting and re-plying, the double-twisted RGO@HHF exhibits highly increased elongation and contraction under light/water stimulation. On this basis, a new strategy is proposed for efficient desalination and anti-salt accumulation. The double-twisted RGO@HHF can elongate to absorb water and contract to evaporate seawater under sunlight/water stimulation, respectively. The accumulated salt can be dissolved in the seawater during the dynamic process. This study provides a promising approach for realizing sustainable seawater desalination.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Lan Xia,Long Yuan,Kai Zhou,Jing Zeng,Kailian Zhang,Guocan Zheng,Qiang Fu,Zhining Xia,Qifeng Fu
Mussel-inspired polydopamine (PDA) and its derivative materials have exhibited a huge potential as a facile and versatile route to fabricate multifunctional coatings on virtually any substrate surface. However, their performance and applicability are frequently obstructed by limited optical absorption in visible regions of PDA and poor surface adhesion persistence of dopamine solutions. Herein, we report a facile strategy to improve these problems by rationally regulating the dopamine polymerization pathway through mixed-solvent-mediated periodate oxidation of dopamine. The spectral analysis, ultrahigh-performance liquid chromatography coupled with high-resolution mass spectrometry, and density functional theory simulations systematically demonstrate that the mixed-solvent reaction systems can effectively accelerate the periodate-induced formation of cyclized moieties in the PDA microstructure and inhibit their further oxidative cleavage, thus contributing to narrowing the inherent energy band gap of PDA and improving the long-lasting surface deposition performance of aged dopamine solutions. Moreover, the newly constructed cyclized species-rich PDA coatings have excellent surface uniformity and significantly enhanced chemical stability. Benefiting from these fascinating properties, they have been further used for permanent dyeing of natural gray hair with remarkably improved blackening effect and excellent practicability, which exhibited their promising prospect in real-world applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 24
·66303-66313
·
IF 5.8
Xu Zhimin,Ju Shaohua,Gao Peng,Lin Junjian,Niu Yifan,Meng Fei,Li Shunling,Li Fangfang,Du Jiahao,Xu Li,Peng Hongbo,Pan Bo
In this study, ferrous composites (Fe x O 4 ) were prepared by microreactor to activate peroxydisulfate (PDS) for the degradation of bisphenol A (BPA) with visible (Vis) light irradiation. X-ray diffraction (XRD), energy-dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM) were used to characterize the morphology and crystal phase of Fe X O 4 . Photoluminescence (PL) spectroscopy combined with amperometric tests were used to determine the role of PDS on the performance of photocatalytic reaction. The main reactive species and intermediates for BPA removal were determined by electron paramagnetic resonance (EPR) measurement and quenching experiments. The result indicated that singlet state oxygen ( 1 O 2 ) contributed more to the BPA degradation than that of other reactive radicals (·OH, SO 4 ·− and ·O 2 − ); these reactive radicals and 1 O 2 formed by the reaction between photo-generated electrons (e − ) and holes (h + ) of Fe x O 4 and PDS. During this process, the consumption of e − and h + also improved their separation efficiency and thus enhanced the degradation of BPA. In addition, the photocatalytic activity of Fe x O 4 in Vis/Fe x O 4 /PDS system was 3.2-fold and 6.6-fold higher than that of single Fe x O 4 and PDS under Vis light, respectively. The Fe 2+ /Fe 3+ cycle could effectively drive the photocatalytic activation of PDS through indirect electron transfer and the formation of reactive radicals. This work illustrated that the degradation of BPA was rapidly in Vis/Fe x O 4 /PDS system mainly through 1 O 2 , which further improve our understanding on the efficient removal of organic contaminants in the environment.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 18
·4569-4578
·
IF 4.3
Li Meng Xiao,Kang Kai Wen,Huang Min,Cheng Ru,Wang Wei,Gao Jie,Wang Jian
Tyrosinase (TYR), as an important biological enzyme, has been widely used in synthetic biology, medical hairdressing, environmental detection, biological sensors, and other fields. In clinical practice, tyrosinase activity is an important indicator for detecting melanoma. Therefore, the detection of tyrosinase activity is of great importance. Based on the polyphenol oxidase activity of tyrosinase, a simple and rapid detection method was proposed based on the adjustable light scattering properties of cobalt hydroxyl oxide nanoflakes (CoOOH NFs). It was found that the amount and size of CoOOH NFs decreased due to the redox reaction mediated by catechol (CC), resulting in a lower light scattering signal of CoOOH NFs. However, in the presence of tyrosinase, catechol was oxidized to a quinone structure, resulting in the reduced decomposition of CoOOH NFs and recovered light scattering signal, which was developed for the quantitative detection of tyrosinase activity. It was found that in the range of 10–400 U/L, the light scattering intensity was correlated linearly with tyrosinase activity, and the limit of detection was 6.71 U/L (3 σ / k ). To verify the feasibility of the proposed method in clinical samples, the spiked recovery experiments were carried out with human serum samples, which showed recovery rates between 93.0% and 104.6%, suggesting the high accuracy. The proposed assay provides a simple and rapid method for detection of a natural enzyme based on the adjustable light scattering properties of CoOOH nanoflakes, which lays the foundation for the development of various enzyme sensing applications in the future. Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zheng Lian,Ting Wu,Xining Zhang,Shuangfei Cai,Youlin Xiong,Rong Yang
Advanced oxidation processes (AOPs) based on photocatalysis and peroxymonosulfate (PMS) activation have shown potential in antibiotics degradation by generating series of reactive oxygen species (ROS). However, construction of AOP materials with easy preparation and high reusability is still a challenge. Herein, we prepared a Mo 2 C/MoO x thin film through one-step chemical vapor deposition (CVD), and this film could synergistically promote PMS activation and visible-light photocatalysis due to the redox cycles of multiple Mo valence states and staggered bandgap structures of Mo-based components in the film. The generated oxygen species (mainly 1 O 2 radical, accompanying by other ones involving OH, SO 4 − and O 2 − radicals) could efficiently degrade the uneasily degradable antibiotics, tetracycline (TC), with a removal efficiency of 91.7 % within 60 min. Meanwhile, the film could maintain the TC degradation capability for at least 10 cycles, exhibiting promising reusability. The work could provide feasible approaches to develop easily prepared AOP thin film materials for antibiotic pollutant degradation.
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危险品化学品经营许可证（带存储）