CHEMISTRY OF MATERIALS
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2018
·
IF 9.89
Ying Liu,Fei Li,Quanlin Liu,Zhiguo Xia
All inorganic cesium lead halide CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) are generally considered to be sensitive and even decompose when exposed to ambient humidity. Herein, we perform a well-controlled investigation of the effect of postsynthetic water treatment of the as-prepared CsPbX3 NCs on the photoluminescence quantum yields (PLQYs) and stability, and one can find that the surface defective layer of CsPbX3 NCs can be dissolved into water and we can further separate the supernatant CsPbX3 NCs hexane solution from the water, which improves the PLQYs of CsPbCl3, CsPbBr3, CsPbI3 from 5%, 69.3%, 68.1% to 78.5%, 95.5%, 91%, respectively. As a synergetic effect, a trace amount of residual water facilitated the hydrolysis of tetramethyl orthosilicate, leading to the formation of SiO2-coated CsPbX3 NCs with high stability. The stable green-emitting CsPbBr3/SiO2 composite is used as an example to combine with red K2SiF6:Mn4+ to fabricate the light-emitting diodes device on the blue InGaN chip, which displays wide color gamut (128% of National Television Standard Committee standard), providing the possibility for liquid-crystal display backlight utilization.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2015
·Vol. 33
·期 6
·857-868
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IF 1.835
Du Chun-hui,Ma Xu-min,Wu Chun-jin,Cai Mei-qiang,Hu Meng-xin,Wang Ting
Polymerizable ionic liquid copolymer P(MMA- co -BVIm-Br) was synthesized by radical polymerization technique, and characterized by Fourier transform infrared spectrometry (FTIR), 1 H Nuclear magnetic resonance ( 1 H-NMR) and gel permeation chromatography (GPC). The resulting copolymer was used to prepare poly(vinylidene fluoride) (PVDF) blend membranes via a phase inversion method. The effects of the copolymer on the polymorphism, surface wettability and zeta potential ( ζ ) of the blend membranes were investigated by ATR-FTIR, contact angle instrument and zeta potential analyzer. Scanning electron microscopy (SEM and SEM-EDS) was also applied to investigate the morphology and the surface element changes of the fabricated membranes. The results indicated that P(MMA- co -BVIm-Br) copolymer existed on the surface of the membrane which made the blend membrane have a positive surface during the experimental pH range. The copolymer was also in favor of the formation of β crystal phase in PVDF membranes. The contact angle experiment indicated that P(MMA- co -BVIm-Br) copolymer could switch the wettability of the blend membranes from hydrophilic to hydrophobic by exchanging Br − anion with PF 6
− . Compared with pure PVDF membranes, the water flux and water recovery flux of the blend membranes were enhanced obviously. The results from the flux recovery ratio (FR) and total fouling ratio ( R
t ) all suggested that the blend membranes had good anti-fouling properties.
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DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 22
·7210-7218
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IF 4.029
Wenhui Liu,Qi Wang,Yan Zheng,Shubin Wang,Yan Yan,Yanzhao Yang
In this study, a method of one-step separation and recycling of high purity Pd(II) and Pt(IV) using an ionic liquid, 1-butyl-3-benzimidazolium bromate ([HBBIm]Br), was investigated. The effects of [HBBIm]Br concentration, initial metal concentration, and loading capacity of [HBBIm]Br were examined in detail. It was observed that [HBBIm]Br was a very effective extractant for selectively extracting Pd(II) and precipitating Pt(IV). Through selectively extracting Pd(II) and precipitating Pt(IV), each metal with high purity was separately obtained from mixed Pd(II) and Pt(IV) multi-metal solution. The method of one-step separation of Pd(II) and Pt(IV) is simple and convenient. The anion exchange mechanism between [HBBIm]Br and Pt(IV) was proven through Job's method and FTIR and 1H NMR spectroscopies. The coordination mechanism between [HBBIm]Br and Pd(II) was demonstrated via single X-ray diffraction and was found to be robust and distinct, as supported by the ab initio quantum-chemical studies. The crystals of the [PdBr2 ·2BBIm] complex were formed first. Moreover, the influence of the concentrations of hydrochloric acid, sodium chloride, and sodium nitrate on the precipitation of Pt(IV) and extraction of Pd(II) was studied herein. It was found that only the concentration of H+ could inhibit the separation of Pt(IV) because H+ could attract the anion PtCl62−; thus, the exchange (anion exchange mechanism) between the anions PtCl62− and Br− was prevented. However, both the concentration of H+ and Cl− can obviously inhibit the extraction of Pd(II) because H+ and Cl− are the reaction products and increasing their concentration can inhibit the progress of the reaction (coordination mechanism).
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CHINESE JOURNAL OF CATALYSIS
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2016
·
IF 2.628
Xinping Duan,Yan Yin,Xuelin Tian,Jinhuo Ke,Zhaojun Wen,Jianwei Zheng,Menglin Hu,Linmin Ye,Youzhu Yuan
Disintegration or redispersion of supported sintered gold nanoparticles (Au NPs) in the presence of alkyl halide can give catalyst regeneration or redispersion of sintered Au catalysts. The selectivity of alkyl halides, temperature and size distributions were investigated to elucidate the redispersion of Au NPs during halide-induced decomposition. This study proved that the alkyl halide induced the redispersion of sintered Au NPs which depended on the R–X (X = I, Br, Cl) bond dissociation energy (BDE) and thus provided a simple descriptor for the regeneration of inactive supported Au catalysts. A correlation between the BDE of R–X and dispersion efficiency was established. The tendency for disintegration and redispersion followed the R–X BDE of the alkyl halide. Compared to alkyl chlorides and bromides, iodides were more efficient for redispersing sintered Au NPs. As a descriptor, the BDE of R–I played a crucial role in particle redispersion. These findings provided insights into the mechanism of organic halide-induced Au NP disintegration and the effect of the halide type on the redispersion of sintered catalysts.
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JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Lu Liu,Yiwen Wu,Mengyu Guan,Zhigao Dai,Guogang Li
The luminescence properties of perovskite quantum dots are crucial for their applications in various optoelectronic devices. Enhancing the luminescence performance of CsPb(Br/I) 3 quantum dots is a critical challenge for their application in optoelectronic devices. This paper explores the use of noble metal nanostructures to improve the luminescence intensity of these quantum dots through localized surface plasmon resonance (LSPR). We conducted electric field simulations to optimize the LSPR effect and prepared Au@Ag@SiO 2 nanobipyramids with tailored LSPR peaks. The nanobipyramids were then connected to CsPbCl 2 Br, CsPbBr 3 , and CsPbBrI 2 quantum dots using amine-functionalized SiO 2 layers, forming a nanocomposite that showed a significant increase in luminescence. The study identifies the importance of the SiO 2 spacer layer in preventing luminescence quenching and demonstrates that the LSPR effect can be harnessed to achieve up to a 15-fold enhancement in luminescence intensity. This research provides a promising avenue for advancing the efficiency of solar energy harvesting devices, light-emitting devices, and optical detectors.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Yuanyuan Cui,Jianmin Sun
The direct oxidative carboxylation of olefins and CO 2 to synthesize cyclic carbonates involves a tandem process of epoxidation and CO 2 cycloaddition reactions. However, designing a multifunctional catalyst for this reaction remains challenging. Herein, a composite catalyst ImBr@UiO-66-Br(Co) was synthesized by post-metallization of Co 2+ and subsequent functionalization with an imidazole ionic liquid (IL), which was used effectively for this reaction. The effects of temperature, CO 2 pressure, catalyst dosage, and reaction time on the direct oxidative carboxylation of olefins to cyclic carbonates were investigated. The results showed that ImBr@UiO-66-Br(Co) exhibited optimal performance in the solvent-free reaction system with styrene (3 mmol), tert -butyl hydroperoxide (6 mmol), and tetrabutylammonium bromide (TBAB, 50 mg) at 80 ℃ under 1 MPa CO 2 for 24 h, achieving a styrene conversion of 90.3 % and styrene carbonate selectivity of 80.7 %. The excellent catalytic activity of ImBr@UiO-66-Br(Co) was attributed to the synergistic interactions of the Lewis acidity Zr 4+ sites, the strong nucleophilicity provided by Br - , the weak base sites from tertiary amine and quaternary ammonium groups in imidazole IL, and the redox-active Co 2+ sites. Additionally, the catalyst was easy to separate and maintained stable activity and selectivity over at least five cycles. Finally, the potential catalytic mechanism for the direct oxidative carboxylation of olefins to cyclic carbonates was proposed.
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ACS Applied Nano Materials
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2024
·
IF 5.3
Yu Yao,Qianhong Shen,Qifeng Chen,Yanyan He,Libei Jiang,Jie Liu,Yue Li,Xudan Cao,Hui Yang
A silver phosphate (Ag3PO4)/silver (Ag)/silver halide (AgX, X = Cl, Br, or I) ternary composite photocatalysts were prepared by loading Ag nanoparticles on Ag3PO4 tetrapods followed with in situ halogenation. The interface charge transfer behavior in the Ag3PO4/Ag/AgX nanocomposite was studied, and the photocatalytic performance was also evaluated. The results show that the Ag3PO4/Ag/AgI photocatalyst exhibits higher photocatalytic activity than the other two photocatalysts due to the more matched band structure between AgI and Ag3PO4. An internal electric field (IEF) from Ag3PO4 to AgI is formed at the heterogeneous interface, so the photogenerated electrons at the conduction band of AgI can rapidly transfer to the valence band of Ag3PO4 and recombine with photogenerated holes, which is consistent with the S-scheme charge transfer mechanism. Meanwhile, the photogenerated electrons left at the conduction band of Ag3PO4 can transfer to Ag nanoparticles due to the Schottky junction and react with oxygen to produce •O2–, which is proved to be the main active species in the photocatalytic procedure. This tandem junction modulated between the S-scheme heterojunction and Schottky junction promotes the efficient separation of photogenerated carriers, thus significantly increasing the average PL lifetime of electrons by 2.95 times. Therefore, the Ag3PO4/Ag/AgI photocatalyst exhibits excellent photocatalytic activity for the degradation of methylene blue and norfloxacin. The seven consecutive cyclic tests prove the good stability of the photocatalyst, thus showing the application potential in the field of sewage treatment.
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ENERGY
·
2025
·
IF 9.4
Xiaohua Li,Zhitao Lei,Yu Cao,Shanshan Shao,Shiliang Wu
The cycloketones were prepared efficiently via the selectively hydrogenation of aqueous phase lignin-derived single phenolic monomer and mixtures. The yield and selectivity of cycloketones was greatly improved over Br modified metal-acid mixed catalyst (PdH5@Br). First, the effect of side-chain functional structures on the aqueous-phase hydrogenation of phenols with Pd/C catalysis was investigated and it was found that the benzene ring with methyl group attached is more easily hydrogenated, and the phenolic hydroxyl side chain was more susceptible to form carbonyl than methoxy groups. A large number of enols existed, thus the catalyst acidity was adjusted by extra addition of HZSM-5, over which the yield of cycloketones from guaiacol was significantly boosted to 67.9%. Subsequently, the electronic properties of catalyst were altered by adding Br over Pd catalyst, weakening the over-chemisorption of intermediate phenol, and the hydrogenating of phenol under PdH5 were enhanced, thus an increased yield of cycloketone of 18.4% occurred. After the hydrotreating of guiaiacol for 2 h at 523 K and 2 MPa H 2 , the yield of cycloketone reached 80.4% on PdH5@Br. The hydrotreating performance of PdH5@Br with lignin-derived phenolic monomer mixtures as the feedstock was also tested, and it presented great universality and stability. It provides an efficient catalyst system and promising technological ideas for biomass hydrotreating.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2024
·
IF 11.2
Xiaotu Yang,Zihao Yue,Ruixiang Deng,Zhengliang Zhang,Tao Zhang,Lixin Song
Stability hinders further development of all-inorganic CsPb X 3 ( X = Cl, Br, I) quantum dots (QDs) although they exhibit promising prospects in optoelectronic applications. Coating perovskite quantum dots (PQDs) with a glass network to form QD glass can significantly improve their stability. However, the dense glass network degrades their luminescent performance. In this work, the crystallization behavior of PQDs in glass and better luminescence properties are prompted by introducing titanium dioxide into borosilicate glass. The luminescence intensity of TiO 2 -doped CsPbBr 3 QD glass is increased by 1.6 times and the PLQY is increased from 49.8 % to 79 % compared to the undoped glass. Evidence proves that the improved properties are attributed to the enhanced nucleation effect of titanium dioxide during the annealing process. Benefiting from the densification of the glass network caused by titanium dioxide doping, the stability of the PQD glass is further improved. LED devices with an ultra-wide color gamut that fully covers the NTSC1953 standard and achieves 128.6 % of the NTSC1953 standard as well as 91.1 % of the Rec.2020 standard were fabricated by coupling PQD glass powder, demonstrating promising commercial applications of PQD glass in optoelectronic displays.
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ATMOSPHERIC ENVIRONMENT
·
2024
·
IF 4.2
Cici Fan,Huijie Yan,Weigang Wang,Zheng Sun,Maofa Ge
Aldehydes are one of the most important oxygenated volatile organic compounds in the atmosphere, contributing to atmospheric radicals such as HO 2 and RO 2 , which play a pivotal role in atmospheric chemistry and the oxidative capacity of the atmosphere. The kinetics, gas-phase products, and SOA formation of pentanal and n-hexanal initiated by Br atoms were studied in this work. The reaction rate constants of n-pentanal and n-hexanal reacting with Br atoms were determined to be (1.77 ± 0.25) × 10 −11 cm 3 molecule −1 s −1 and (2.07 ± 0.29) × 10 −11 cm 3 molecule −1 s −1 at 298 K and 760 Torr, respectively. Key gas-phase products, including smaller aldehydes, carboxylic acids, and alcohols, are known to contribute to atmospheric reactivity and have potential implications for air quality by promoting the formation of secondary pollutants and influencing the oxidative capacity of the atmosphere. The SOA yields were (5.24 ± 0.10)% and (6.00 ± 1.20)% for n-pentanal and n-hexanal, respectively, higher than the SOA yields of the aldehydes reaction initiated by OH radicals. The higher SOA yields observed from Br atoms oxidation compared to OH radical oxidation highlight the necessity to re-evaluate the role of halogen chemistry in atmospheric processes, particularly in regions where halogen compounds are prevalent. This research enhances our understanding of the atmospheric fate of aldehydes and highlights the importance of considering halogen-driven oxidation pathways in atmospheric models.
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ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Linna Han,Zixu Wang,Wanfang Feng,Qing Xia,Yucun Niu,Liyan Liu
Background The enrichment of sugar phosphates (SPx) from complex biological samples was of significant importance for elucidating their roles in physiological and pathological processes. However, the detection of SPx faced numerous challenges due to the high structural similarity among its isomers, its extremely low abundance within cells, the complexity of biological samples, and the inefficiency and cumbersome nature of traditional enrichment methods. Therefore, there was an urgent need to develop an efficient enrichment technique, leveraging the advantages of magnetic separation to achieve precise detection of sugar phosphates in biological samples. Results A novel magnetic material, Fe 3 O 4 @UiO-66-Br, was synthesized for efficient and convenient enrichment of SPx in biological samples. The material exhibited a high specific surface area (225.08 m 2 /g) and strong magnetism (33.61 emu·g −1 ). Only 600 μg of Fe 3 O 4 @UiO-66-Br was required to completely adsorb five types of SPx within 4 min. The adsorption process was pH-tolerant and can be accomplished simply by standing. Kinetic, thermodynamic, and isotherm studies revealed favorable adsorption properties, characterized as spontaneous and endothermic monolayer chemisorption. Mechanistic studies using XPS, FT-IR, and DFT identified multiple interactions, including coordination, hydrogen bonding, and electrostatic interactions. The analytical protocol featured a wide linear range (0.01–10000 ng/mL), low detection limits (0.002–0.01 ng/mL), high precision (RSD<13.21 %), and accuracy (80.05 %–116.41 %). Significance The protocol was successfully applied to real blood samples, demonstrating the potential of magnetic MOFs for SPx adsorption and detection. This novel material and protocol provided an efficient approach for enriching and detecting trace SPx in complex biological matrices, facilitating further studies on their roles in physiological and pathological processes.
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Journal of Environmental Sciences
·
2025
·
IF 6.3
Canyan Yang,Wei Liu,Zhao Zuo,Jinhua Xiao,Huawang Zhao,Bihong Lv,Zuoming Zhou,Xiaomin Wu,Guohua Jing
Carbon-carbon (C-C) coupling, the rate-determining step in electrocatalytic CO 2 reduction reaction (CO 2 RR) to C 2+ products, has low efficiency and poor stability. It originates from an ineffective water dissociation capability and a high energy barrier for the C-C coupling pathway on existing catalysts. Herein, an efficient and facile Br-CuO electrocatalyst was synthesized to promote water dissociation and achieve an impressive Faradic Efficiency (FE) of around 60% C 2 H 4 at a current density of up to -350 mA/cm 2 with stability of 16 h. Combinative theoretical and experimental protocols strongly evidence that the architecture of Cu 0 -Cu + sites is crucial for the enhancement in CO 2 RR activity. Cu 0 activates CO 2 and Cu + strengthens *CO adsorption to further boost C-C coupling. Furthermore, Br doping can facilitate the dissociation of water to generate *H, which promotes the protonation of *CO to *CHO, thereby enabling the low energy barrier asymmetric *CHO-*CO coupling. The in situ ATR-FTIR and Density functional theory (DFT) was analyzed to explain the reaction mechanism and pathway. This study elucidates the critical function of water dissociation and provides a promising avenue to efficient CO 2 -to-C 2 H 4 electrocatalysis.
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