APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Chaoyang Song,Junqi Nie,Chao Ma,Cuifen Lu,Feiyi Wang,Guichun Yang
1,2,3-Triazole contained conjugated porous polymers (CPPs) have recently emerged as a new class of efficient photocatalysts. To gain more insight into the excellent photocatalytic activity of this kind of CPPs, herein, we report the design and preparation of a series of 1,2,3-triazole-based CPPs via oxidative coupling polymerization to study their photocatalytic performance. These CPPs have donor-acceptor properties and 1,2,3-triazole serves as an electron acceptor. The resulting CPPs with thiophene, carbazole and diphenylamine as electron donor units, respectively, have distinct porosities and optoelectronic properties, and showed effective photocatalytic performance towards oxidative hydroxylation of arylboric acids and alkylation of vinylarenes with diethyl bromomalonate or bromoacetonitrile. The thiophene contained CPP was a more efficient photocatalyst for the catalytic reactions, which can be attributed to its smaller optical band gap and greater charge separation efficiency. Furthermore, PTPT has shown reliable recyclability with no significant loss in its catalytic activity.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
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IF 4.291
Xinmeng Xu,Xiang Xu,Yanning Zeng,Faai Zhang
Well-defined poly (methyl methacrylate) (PMMA) was prepared by metal-free atom transfer radical polymerization (metal-free ATRP) using a commercially available inexpensive organic dye fluorescein (FL) as a photocatalyst, and amines as electron donors without degassing of the polymerization mixture. The effect of the molar ratio of the electron donor to FL on the kinetic and induction period during the polymerization was investigated. Moreover, the kinetics of MMA polymerization was affected by the catalyst concentration, electron donor species, and oxygen concentration in the polymerization system. Finally, the high activity of the metal-free ATRP system in the presence of a small amount of oxygen was confirmed by chain extension polymerization.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2021
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IF 7.267
Jinming Zeng,Yongxiang Wang,Karthikeyan Rajan,Zongliang Xiao,Rizwan Ur Rehman Sagar,Ping Liu
N,N,N′,N′-tetraphenylbenzidine (TPB) and N,N,N′,N′-tetra(p-tolyl)benzidine (TPB-4Me), were synthesized. Their optoelectrochemical and electrochromic properties were discussed. Both TPB and TPB-4Me exhibited a reversible color change between colorless and dark-green under applied bias voltages . Furthermore, TPB or TPB-4Me and ethyl viologen (EV) or tungsten trioxide (WO 3 ) were used as anode and cathode electrochromic materials, respectively; a series of color complementary ambipolar gel electrochromic devices (ECDs), ECD-3, ECD-4, ECD-5, and ECD-6, were fabricated and investigated. All of ambipolar ECDs displayed reversible color changes between transparent and black under different voltages. In addition, they exhibited high optical contrast in both visible and near-infrared regions; their corresponding optical contrasts were 74.6%, 87.9%, 78.2%, and 78.5% at 750 nm, respectively. In comparison, ECDs based on WO 3 exhibited higher optical contrast (in near-infrared region) and shorter bleaching time than ECDs based on EV. The optical contrasts of ECD-5 and ECD-6 based on WO 3 were greater than 57.6% and 54.0% in the wavelength range of 420–1000 nm, respectively. Their corresponding coloring/bleaching times were found to be 6.6 s/21.7 s and 6.0 s/24.6 s, respectively. The transparent-to-black attributes of these ambipolar ECDs are promising for electrochromic smart windows .
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Shuyue Li,Dongxu Yu,Lina Liu,Shiyu Yao,Xiaoqi Wang,Xu Jin,Dong Zhang,Fei Du
Rechargeable aqueous zinc-ion batteries (AZIBs) have attracted widespread attention as a sustainable energy storage system owing to the safe aqueous electrolyte. Manganese-based materials are potential cathodes for AZIBs, whereas, the dissolution of manganese would result in the significantly decline of capacity and unsatisfied lives. Herein, an in-situ electrochemical induced artificial solid electrolyte interphase (SEI), (Zn(OH) 2 ) 3 (ZnSO 4 )(H 2 O) 5 nanoflakes, is discovered to generate and coat on the surface of MnO@C in the initial charging process which could prevent the direct contact between the electrolyte and electrode with the result of inhibiting the excessive dissolution of manganese oxides. Benefiting from the artificial SEI, MnO@C exhibits an extremely excellent cycle performance with 0.003% capacity decay per cycle over 10,000 cycles without Mn 2+ additive in electrolyte. Moreover, MnO@C is proved to demonstrate a (de)intercalation reaction mechanism after the electrochemical activation process in initial charging process. The strategy proposed in this study provides a new proposal to develop high stable manganes oxide cathodes for AZIBs.
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ANALYTICAL CHEMISTRY
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2021
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IF 6.986
Yue Lin,Xiu Huang,Yongchun Liu,Dong Cao,Dawei Lu,Zeming Feng,Qian Liu,Zhenyu Lin,Guibin Jiang
Soot is ubiquitous and has large detrimental effects on climate, air quality, and human health. However, identification of soot in carbonaceous media is very challenging due to its nanoscale carbon nature and complex sources. Due to the shortage in the methodology, until now, the fate and health effect of soot particles after inhalation are still poorly understood. Here, we report a new method for label-free identification, quantification, and imaging of soot particles in complex media based on laser desorption/ionization mass spectrometry fingerprinting. We found that soot particles from different origins and with different morphologies showed highly consistent mass spectral fingerprints deriving from peak ratios of small carbon cluster anions (C2––C10–), which enabled both accurate quantification of soot in fine particulate matter (PM2.5) samples and label-free imaging of soot particles in biological media. By using this technique, we tracked and imaged the suborgan distribution of soot particles in mice after exposure to PM2.5. The results showed that the lung is the main target organ for short-term inhalation exposure to soot particles. This study helps to better understand the inhalation toxicology of soot and also provides a practical novel methodological platform for identification, tracing, and toxicological studies of elemental carbon-based nanomaterials.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Ling Wang,Ying-shuang Zhang,Hong-ru Jiang,Hui Wang
As promising adsorbents in carbon capture and storage, hyper-cross-linked polymers (HCPs) require high CO2 uptake and selectivity over N2 and CH4. Herein, we reported a series of novel carbonyl-incorporated HCPs using oxalyl chloride as a cross-linker. To enhance the CO2 adsorption capacity and gas selectivity, the fabricated HCPs were further modified by methods of amine functionalization (HCPs-N) and KOH activated carbonization (HCPs-C). Accordingly, the maximum CO2 adsorption capacity of HCPs (HCP3) reaches 198 mg/g owing to abundant carbonyl groups and dominant microporous structures (SBET1047 m2/g, Smicro628 m2/g). Meanwhile, under the effect of amine functionalization, the selectivity of the obtained HCPs-N (HCP3-N) is greatly improved, reaching a maximum of 85.71 (SCO2/N2) and 8.12 (SCO2/CH4). Furthermore, after KOH activated carbonization, the amount of CO2 adsorption of HCPs-C (HCP3-C) significantly increases to 270 mg/g due to the higher specific surface area (SBET1421 m2/g) and arising ultramicroporous structures (Vultra0.26 cm3/g). Aromatic polymers with microporous structures and carbonyl group can be prepared and functionalized to improve the CO2 adsorption and gas selectivity by simple and mild reactions. Our study provides new options for CO2 capture of HCPs and provides a new idea for the synthesis of new HCPs.
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LUMINESCENCE
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2020
·Vol. 36
·期 2
·336-344
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IF 1.855
Yan Liu,Jian shi Du,Shao long Qi,Lu bao Zhu,Qing biao Yang,Hai Xu,Yao xian Li
A novel highly active fluorescence chemical sensor (TBI) for CN − was synthesized based on triphenylamine–benzothiazole as a new fluorophore, and was used for the first time as a fluorophore for detection of CN − . Fluorescence quantum yield of the probe clearly increased when using triphenylamine–benzothiazole as the group. The probe possessed good selectivity towards CN − and had anti-interference ability over common ions. After adding CN − , the UV–visible spectrum of TBI changed clearly and underwent a dramatic colour change from red to colourless, which could be observed clearly by the naked eye. The limit of detection for CN − was calculated to be 2.62 × 10 −8 M, which was well below the WHO cut-off point of 1.9 μM. The novel probe displayed fast sensing of CN − . The detection mechanism was a nucleophilic addition reaction between CN − and a carbon atom –C = N– in indole salt. The π-conjugation and intramolecular charge transfer (ICT) transition in the TBI molecule were destroyed by this addition, which resulted in a change of fluorescence before and after the addition of CN − . The mechanism was verified using theoretical calculation, 1 H NMR titration, and mass spectra. In addition, the probe showed low cytotoxicity and could be used for biological imaging in HeLa cells.
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Green Energy & Environment
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2020
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IF 6.395
Yuxin Wu,Yuncheng Ding,Jianhong Xu,Yundong Wang,Kathryn Mumford,Geoffrey W. Stevens,Weiyang Fei
Utilization of carbon dioxide (CO 2 ) is of great significance in the development of CO 2 absorption and the solution of greenhouse gas effect. Highly efficient conversion of CO 2 into cyclic carbonate with green catalysts is essential for the more sustainable expansion of CO 2 fixation. Traditional batch reactor is limited by low efficiency, high cost and low security. Meanwhile, continuous flow system showcased a myriad of virtues, including shortening the residence time from hours to seconds, and decreasing reaction temperature, and possessing the nature of easy industrial scale-up. In this paper, a continuous-flow microreaction system was developed to synthesis propylene carbonate (PC) from propylene oxide (PO) and CO 2 using 1-butyl-3-methylimidazolium bromide ([BMIM]Br) as catalyst. By observing the flow patterns inside microreaction system, the effects of reaction temperature, molar fraction of catalyst, operating pressure, residence time, molar ratio of CO 2 /PO as well as recycling performance of catalyst on the overall performances were comprehensively evaluated into details. Under different reaction conditions, the flow patterns were set to vary between slug flow and annular flow. The results showed that the yield of propylene carbonate (PC) can reach 99.7% at 140 °C and 3.0 MPa with the residence time of 166 s, while the recycling performance of the designed system greatly conforms the future trend of green chemistry.
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JOURNAL OF LUMINESCENCE
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2020
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IF 3.28
Kaiyao Shi,Yang Liu,Jingru Ma,Yuqing Zhao,Liang Liu,Jingying Wang
In this paper, five boron dipyrromethene dyes were designed with aromatric-amine-cored structure. Their molecular structure and photophysical performance were discussed in detail in various solvents. It was found that these five dyes were highly fluorescent ones in toluene with emission quantum yield higher than 95%. Amplified spontaneous emission (ASE) performance of these fluorescent dyes was then analyzed in toluene. Efficient and promising ASE spectra peaking at ~545 nm were observed for four of these fluorescent dyes with full width at half maximum value of ~5 nm and ASE efficiency up to 9%. It was confirmed that aromatric-amine-cored structure was positive to improve ASE performance. The reason for ASE missing in one of these fluorescent dyes was revealed as the vibrational relaxation of its N–H group. In solvent MeCN, however, this dye showed an interesting phenomenon, emission turn on effect towards Hg(II). Its sensing performance and sensing mechanism were discussed in detail as well. Good linear response and high selectivity were found for both colorimetric sensing and emission turn on sensing.
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MATERIALS CHEMISTRY AND PHYSICS
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2021
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IF 4.094
Lijing Chang,Yanjun Hou,Ju Bai,Haoran Xu,Yuhang Zhang,Shoulei Miao,Cheng Wang
Two electrochromic polymers containing triphenylamine groups with memory storage function were synthesized. The structures of the polymers have been characterized in detail. The polymers had good solubilities, excellent thermal stabilities and high fluorescence intensities. The reversible redox peak can also be clearly observed in the cyclic voltammogram, and the electrochromic color contrast was obvious. In addition, the polymers can also be used as memory storage materials with excellent "write-read-erase-rewrite" performance. Among them, the P2 film presented noticeable color changed from light yellow to pine green during the voltage 0 V–1.4 V, the coloring time was 3.3 s and the bleaching time was 3.7 s, the coloration efficiency was 207 cm 2 C −1 . The ON/OFF current ratio of P2 was 10 3.1 and the threshold voltage of P2 was 0.91 V. The results showed that these polymers have broad application prospects in the field of dual-function materials.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Meng Rong,Liangrong Yang,Li Wang,Jiemiao Yu,Hongnan Qu,Huizhou Liu
Three triphenylamine-based polyaminal networks (TMPs) with monodispersed ultramicropore (about 0.54 nm) and abundant doped-nitrogen (up to 42.88 wt%) are successfully prepared through the direct polycondensation of triphenylamine-based aldehydes with melamine . The synergistic effects of uniform ultramicropore and rich CO 2 -philic polar sites endow TMPs with exceptional CO 2 sorption capacity and selectivity over N 2 and CH 4 . For example, the CO 2 uptakes of TMPs can reach 15.7 wt% (273 K) and 11.2 wt% (298 K) at 1 bar. Especially, at a low pressure of 0.15 bar, TMP-3 simultaneously exhibits excellent CO 2 sorption capacity of 4.16 wt% (∼1 mmol g −1 , 298 K), high adsorption selectivities of CO 2 /N 2 (61.9, 298 K) and CO 2 /CH 4 (7.8, 298 K) and good cycle reusability, which are superior to most of the microporous polymers. In addition, the porous properties of TMPs could be effectively tuned by varying the amount of substitution formyl. This facile preparation method and excellent CO 2 adsorption properties enable TMPs to possess promising application potential in CO 2 capture and separation from low-concentration gas mixtures.
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DYES AND PIGMENTS
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2019
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IF 4.018
Yang Yuan,Pei Yin,Tao Wang,Zengming Yang,Weidong Yin,Shaoxiong Zhang,Chunxuan Qi,Ma Hengchang
A variety of triphenylamine (TPA) are shown to undergo C–C bond formation using quinone-based chloranil/H + reagent as the metal free oxidative system to afford triphenylamine dimers very conveniently. Then, TPA dimers have been further converted to the emission color tunable compounds via simple chemical transformations. Importantly, we established the primary relationship between chemical structures with the optical behaviors from the aspect of emission (λ em ) wavelength, fluorescence life time (τ) and aggregation-induced-emission (AIE) property in this work. The further application of these compounds to cell imaging was fully demonstrated.
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