SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
·
IF 4.098
Yanxia Xiao,Wenjuan Dong,Huiping Wang,Yumin Hao,Zihan Wang,Shaomin Shuang,Chuan Dong,Xiaojuan Gong
A novel visual nanoprobe was developed for the sequential detection of morin and zinc ion (Zn 2+ ) based on Cl and N co-doped carbon quantum dots (ClNCQDs) via a fluorometric and colorimetric dual-readout mode. The yellow fluorescence ClNCQDs was synthesized by the one-step hydrothermal treatment of o -chlorobenzoic acid and p -phenylenediamine. The most distinctive property of the ClNCQDs is the large stokes shift (177 nm), which is significantly higher than other reported CQDs. The fluorescence of the ClNCQDs can be effectively quenched by morin based on the synergistic effect of IFE, electrostatic interaction, and dynamic quenching process, and recovered upon the addition of Zn 2+ due to strong interaction between morin and Zn 2+ . The nanoprobe exhibited favorable selectivity and sensitivity toward morin and Zn 2+ with detection limits of 0.09 µM and 0.17 µM, respectively. Simultaneously, the color of the ClNCQDs solution was changed (light-pink → faint-yellow → dark-yellow) along with the variation of the fluorescence signal of the ClNCQDs. This proposed nanoprobe was successfully applied for morin and Zn 2+ analyses in actual samples and live cells with high accuracy. The results of this study demonstrate the great application prospects of the ClNCQDs for morin and Zn 2+ detection in complex actual samples and biosystems.
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COMBUSTION AND FLAME
·
2021
·
IF 4.185
Tingting Zhou,Xiaodong Li,Chunjiao Liu,Xianrui Shi,Bo Wu,Xiaohui Duan,Guangcheng Yang
To meet the requirement of miniaturization and integration of the micro thrusters based on the chemical fuels, high-energy density compound is an emerging material as the chemical fuel. However, it is still challenging to realize the high-efficiency, stable and self-sustaining microcombustion of the high-energy density chemical fuels. Herein, we report the high-performance microcombustion of CWs/AP/CL-20 composite with nanoscale 2,4,6,8,10,12-(hexanitrohexaaza)cyclododecane (CL-20) and oxidizer ammonium perchlorate (AP) confined in a self-standing carbonized butterfly wing scales (CWs) matrix. CWs with multi-channeled hierarchical porous structure provide a model architecture for loading of AP and CL-20. CL-20 is designed to serve as heat/pressure loss compensate agent due to its high-energy density, fast energy release rate and large amounts of gas release during combustion process. The combustion of CWs/AP/CL-20 is greatly enhanced due to the enhanced heat and mass transfer originating from the multi-channeled hierarchical porous structure and synergistic reactions between components at nanoscales, which is demonstrated as promising solid-propellant for the micro thruster. It is found that the sample with oxygen balance close to zero, which can be conveniently regulated by adjusting the mass ratio of CL-20 and AP, has the best microcombustion performance, resulting in a specific impulse of 383.5 N·s/kg.
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CHEMICAL ENGINEERING COMMUNICATIONS
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2016
·
IF 1.433
Lu Bai,Shu-Ni Li,Quan-Guo Zhai,Yu-Cheng Jiang,Man-Cheng Hu
In the present work, physicochemical properties, such as density (ρ), refractive index (nD) and viscosity (η), for six binary systems containing [Cnmim]Cl (Cnmim = 1-alkyl-3-methylimidazolium; n = 6, 8) and three dipolar aprotic solvents [N-methyl-2-pyrrolidinone, 1,3-dimethyl-2-imidazolidinone and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone)] were measured at wide composition ranges and temperatures from T = 288.15 to 333.15 K at atmosphere pressure. Moreover, the derived properties, such as excess molar volumes (), apparent molar volumes (Vφ,i), deviations in refractive index (ΔnD), and isobaric thermal expansivity coefficients (αP), were calculated. The Redlich–Kister polynomial equation was fitted to the excess molar volumes and the deviation in refractive index data. The experimental results in this work allow us to discuss the interactions in the mixtures. The physicochemical properties of such systems may be useful for applications of imidazolium-based ionic liquids in the field of chemical engineering.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Mengmeng Zhu,Junbo Wang,Lei Hou,Yiwen Yuan,Lili Liu,Yaoqing Chu,Chunmei Huang
The design and syntheses of new birefringent crystals will be of great importance in commercial applications and materials science. A series of ultraviolet (UV) birefringent crystals, AX·(H2SeO3)n (A = K, Cs; X = Cl, Br; n = 1, 2), with large sizes up to 23 × 6 × 3 mm3, was successfully synthesized by simple aqueous solution method. These four compounds belong to three different space groups. Isomorphic KCl·(H2SeO3)2 and CsCl·(H2SeO3)2 crystallize in the P1¯ space group, while CsBr·(H2SeO3)2 and CsCl·H2SeO3 crystallize in the P21/m and P21/c space groups, respectively. They exhibit cocrystal structures composed of [2(H2SeO3)]∞ and [AX]∞ frameworks, ingeniously inheriting the large optical anisotropy of selenite and the wide band gap of alkali metal halide. And it proves that these compounds indeed possess large birefringence (0.1–0.17 at 532 nm) and short UV cutoff edges (227–239 nm), achieving a balance of optical properties. This research affords a simple and viable strategy for the design and syntheses of new UV birefringent crystals. Besides, it is also found that the n value and ionic size (A and X ions) have important influences on the crystal structures and optical properties of AX·(H2SeO3)n. And this will promote further understanding of the alkali metal halide selenite family.
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CHEMISTRY OF MATERIALS
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2024
·
IF 7.2
Yan Guo,Bin-Wen Liu,Chao-Hong Xie,Wen-Fa Chen,Ming-Xin Li,Xiao-Ming Jiang,Guo-Cong Guo
Rare-earth infrared nonlinear optical (IR NLO) compounds have garnered significant attention due to their abundant electronic structures. However, their NLO efficiency has been relatively modest, attributed to the localization of valence electron shells in rare-earth metals. Traditional design strategies for IR NLO materials have predominantly focused on MQ4 (M = metal, Q = S or Se) tetrahedra, with limited exploration of MQ6 octahedra. We introduce a novel approach to enhance NLO effects by incorporating distorted mixed anionic octahedral M(S/X)6 groups. To illustrate this strategy, we undertake structure modification and optimization of IR NLO performance using the Y–Ga–Ge–S system as an example. The synthesis of a new rare-earth chalcogenide, Y6Ga2GeS14 (1), serves as a foundation. Further halogen atom substitution yields Y6Ga4.2S13.6Cl3.4 (2), Y6Ga2.83Ge2S16.75Cl (3), and Y6Ga2.83Ge2S16.5Br1.5 (4). All compounds demonstrate remarkable NLO performance, including moderate NLO coefficients (0.17–0.70 × AgGaS2), large laser-induced damage thresholds (LIDTs) (3.78–6.19 × AgGaS2), and a broader transmission range (0.5–14.9 μm). The incremental enhancement of NLO efficiency in compounds 1–4 can be attributed to symmetry breaking induced by halogen atom substitution and increased distortion of the octahedral M(S/X)6 motifs in their structures, validating the effectiveness of our strategy. Notably, this strategy concurrently increases the band gap and LIDT, overcoming the NLO–LIDT incompatibility, being strikingly different from other reported approaches. This work provides new insights into optimizing the NLO performance of rare-earth IR NLO compounds through the modulation of octahedral motifs.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 30
·17299-17305
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IF 3.43
Chenyang Zhou,Ya Chu,Linlin Ma,Yingqian Zhong,Chao Wang,Yalan Liu,Haoyue Zhang,Beibei Wang,Xia Feng,Xi Yu,Xiaotao Zhang,Yan Sun,Xiaozeng Li,Guangjiu Zhao
In this work, we introduced halogen-substituted chiral molecules as A-site cations to synthesize a series of novel organic–inorganic hybrid two-dimensional (2D) chiral perovskite materials (R-X-p-mBZA)2PbBr4 (X = H, F, Cl, Br; p: para-position; mBZA = α-methylbenzylamine) for the first time. This halogen-substituted cation strategy collectively solved problems of narrow emission, weak chirality and low photoluminescence quantum yield (PLQY) for the emerged chiral perovskites. Photoluminescence (PL) spectra are significantly broadened due to the additional emission from self-trapped excitons (STEs) besides free excitons (FEs) states modulated by introducing significant disorder to the Pb–Br–Pb angle. The chirality of A-site chiral molecules is transferred and amplified to entire perovskite materials by fixing the chiral molecules at A-site via the interaction of halogen atoms. Furthermore, their PLQYs are improved with the reduction of energy gap and inhibition of the non-radiative transition from STEs to ground state. The halogen-substituted A-site cation strategy can be performed to develop organic–inorganic hybrid chiral perovskites with various optoelectronic applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Kexin Li,Zhenxing Zeng,Liushui Yan,Mingxin Huo,Yihang Guo,Shenglian Luo,Xubiao Luo
A series of nonmetallic elements co-doped titanium dioxide coated carbon nitride nanotubes (C/X-TiO 2 @C 3 N 4 NTs, X = N, F, Cl) was successfully prepared by a simple sol-gel-pyrolysis process using phenolic organic pollutants, titanium butoxide, and carbon nitride nanotubes as precursors. The morphology, porosity, phase and chemical structure, and optical and electronic property of as-prepared C/X-TiO 2 @C 3 N 4 NTs were well characterized. The as-prepared C/X-TiO 2 @C 3 N 4 NTs exhibited excellent visible-light photocatalytic activity in the conventional degradation and hydrogen evolution systems compared with traditional TiO 2 /g-C 3 N 4 heterojunction, which is attributed to their unique tubular nanostructure and nonmetallic elements co-doped TiO 2 component. Subsequently, the visible-light photocatalytic activity of C/X-TiO 2 @C 3 N 4 NTs was further studied in the simultaneous hydrogen evolution with organic pollutant degradation system on the basis of our previous work. The reaction mechanisms in different photocatalytic systems were further discussed in detail.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yanli Kong,Siyu Dai,Qingwu Chen,Yong Nie,Jiangya Ma
Slow transformation efficiency of Fe(III)/Fe(II) limits the generation of radicals in peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs), and these radicals was easy to be interfered by the presence of water constituents. In addition, in-situ coagulation during this oxidation process was neglected. This study proposed Fe(II)/PMS-Mn(VII) in the presence of chlorides ions (FPMC) process to reveal multiple promoting effects of Mn on redox cycle of Fe(III)/Fe(II) and different reactive mechanisms of Cl − on types of radicals generation pathways, and the in-situ coagulation enhanced mechanisms was investigated. Results showed that the dual functionality of oxidation and in-situ coagulation in FPMC process was significantly enhanced that carbamazepine (CBZ) could be efficiently and quickly removed. The reduction product Mn(III) of Mn(VII) could promote the redox cycle of Mn(II)/Mn(III) and Mn(III)/Mn(IV) that facilitated Fe(III)/Fe(II), sustaining the reactivity of the system. Cl − could significantly promote the cycling of Mn(Ⅲ)/Mn(Ⅳ) that indirectly affected the cycle of Fe(III)/Fe(II).
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JOURNAL OF ORGANIC CHEMISTRY
·
2024
·
IF 3.3
Yangyi Zhang,Guisheng Deng
In the Au(PPh3)Cl/AgOTf/TsOH/MeCN/N2/25 °C system, diastereoselective synthesis of cis-3a,8a-dihydrofuro[2,3-b]benzofuran derivatives with a substituent at the 8a-position has been achieved by using 1-(2-hydroxyphenyl)-3-arylprop-2-yn-1-ols and β-oxoketones (amides, acid) as starting materials. The studies revealed that the acidity of methylene in substrates plays a key role in the differential reactions. A stronger acidity of the methylene is favorable in the desired conversion. The unique role of TsOH as an additive acid in the synthesis strategy has been rationalized. 2-Oxo-phosphonate, 2-oxo-sulfonate, and 3-oxobutanoate are suitable for the conversion.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 6
·1-8
·
IF 6.232
Wang Xiuli,Cheng Zhili,Zhou Yun,Tammina Sai Kumar,Yang Yaling
A fluorescence method is described for the determination of hydroquinone based on the double carbon dot system as peroxide mimic enzymes and fluorescent probes. Deep eutectic solvent (DES)–based fluorescent carbon dots (N/Cl-CDs) and copper-doped carbon dots (N/Cu-CDs) were prepared by the hydrothermal method. Both carbon dots were characterized with transmission electron microscopy (TEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), ultraviolet-visible (UV-Vis) spectroscopy, X-ray photoelectron spectrometry (XPS), Fourier transform infrared (FT-IR) spectroscopy, and fluorescence spectroscopy. N/Cl-CDs displayed intrinsic peroxidase-like activity and were able to catalyze the oxidation of hydroquinone (H 2 Q) to p-benzoquinone (BQ) along with an intermediate. The intermediate (BQ) did quench the N/Cu-CD photoluminescence (PL) at 450 nm using an excitation wavelength of 347 nm. Based on the results, a fluorescent platform is proposed for the determination of hydroquinone with a promising determination limit of 0.04 μM (linear range, 1.0–75 μM). The recoveries of spiked water samples were in the range 89.5–105.1%, with relative standard deviations (RSDs) of 1.5–2.9%. This method was applied to determination of H 2 Q in environmental water samples.
A fluorescence method was established for the determination of hydroquinone based on the double carbon dot system as peroxide-mimic enzymes and fluorescent probes. Chlorine-doped carbon dots (N/Cl-CDs) derived from deep eutectic solvent (DES) displayed intrinsic peroxidase-like activity, and were able to catalyze the oxidation of hydroquinone (H2Q) to p-benzoquinone (BQ) along with an intermediate. The intermediate (BQ) did quench the N/Cu-CD photoluminescence (PL). This method was applied to H2Q in environmental water samples.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 27
·18219-18226
·
IF 4.449
Weiyin Gao,Chenxin Ran,Minqiang Wang,Le Li,Zhongwang Sun,Xi Yao
Although reduced graphene oxide (rGO)-based photocatalyst composites have been intensively developed during the past few years, the influence of reduction extent of rGO on the photocatalytic performance of the rGO-based composite has virtually not been investigated due to some technical limitations, such as the poor water dispersibility of rGO and low reduction selectivity of the hydrothermal method, which make it difficult to control the reduction extent of rGO in these composites. Herein, we used a facile room-temperature method to synthesize Ag/AgX (X = Cl, Br)/rGO photocatalyst composites as a model to study the effect of reduction extent of rGO on the photocatalytic performance of the photocatalyst. It was found that the photocatalytic activities of both Ag/AgCl/PrGO and Ag/AgBr/PrGO systems had an optimized threshold of the reduction extent of photoreduced GO (PrGO). More importantly, due to the different conductive band values of AgCl and AgBr, the optimized thresholds in the two systems were at different PrGO reduction extents, based on which we proposed that the favorable energy band matching between AgX and PrGO in the two systems played a crucial role in obtaining high photocatalysis performance. Besides, the photocatalytic reaction of the Ag/AgBr based system was confirmed to be a pseudo-second-order kinetics reaction rather than pseudo-first-order kinetics reaction. The new insights presented in this work provided useful information on the design and development of a more sophisticated photocatalyst, and can also be applied to many other applications.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·
IF 11.3
Jinchen Jiang,Haixia Meng,Zhenhao Shu,Nannan Zhao,Xiaojun Lin,Jianglan Li,Minjun Qin,Siyu Wu,Lianglin Qiu
As an emerging alternative to perfluorooctanesulfonate (PFOS), 6:2 chlorinated polyfluoroalkyl ether sulfonate (6:2 Cl-PFAES) is associated with male reproductive disorders, yet its testicular targets and mechanisms remain unclear. This study combined in vivo exposure of male C57BL/6J mice (0, 4, 40, and 400 μg/L for 18 weeks) and in vitro assays in primary Leydig cells to demonstrate that 6:2 Cl-PFAES dose-dependently reduced sperm count and serum/testicular testosterone, accompanied by testicular interstitial vacuolation. Transcriptomics and metabolomics demonstrated the concurrent significant enrichment of autophagy pathways and disruption of lipid metabolism. Mechanistically, 6:2 Cl-PFAES suppressed expressions of Sirtuin 1 (SIRT1), ras-related GTP binding protein 7 (RAB7), and deacetylation of forkhead box class O1 (FOXO1), thereby impairing lipophagy flux and promoting lipid droplets accumulation. Molecular docking indicated comparable binding affinity of 6:2 Cl-PFAES and PFOS to SIRT1 (−10.4 kcal/mol), and further research demonstrated that 6:2 Cl-PFAES reduced the deacetylation activity of SIRT1. Crucially, Sirt1 overexpression in transgenic mice (Sirt1TG) or pharmacological activation of SIRT1 (SRT1720) and RAB7 (ML-098) rescued testosterone synthesis and restored lipophagy flux. This study identifies the SIRT1–FOXO1–RAB7 axis as a core target for 6:2 Cl-PFAES-induced suppression of testosterone biosynthesis via lipophagy dysregulation, providing critical molecular insights for assessing the reproductive risks of PFOS alternatives.
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