Materials
·
2024
·Vol. 17
·期 11
·2563
·
IF 3.1
Qi Liu,Hang Li,Xiaoqian Wang,Jiazhen He,Xuemin Luo,Mingwei Wang,Jinfeng Liu,Yong Liu
Amidst the rapid advancements in the fields of photovoltaics and optoelectronic devices, CsPbBr3nanosheets (NSs) have emerged as a focal point of research due to their exceptional optical and electronic properties. This work explores the application potential of CsPbBr3NSs in photonic and catalytic domains. Utilizing an optimized hot-injection method and a ZnBr2-assisted in situ passivation strategy, we successfully synthesized CsPbBr3NSs with controlled dimensions and optical characteristics. Comprehensive characterization revealed that the nucleation environment and thickness significantly influenced the structure and optical performance of the materials. The results indicate that the optimized synthesis method enables control over the lateral dimensions of the nanoparticles, ranging from 9.1 ± 0.06 nm to 334.5 ± 4.40 nm, facilitating the tuning of the excitation wavelength from 460 nm (blue) to 510 nm (green). Further analyses involving photoresponse and electrochemical impedance spectroscopy demonstrated the substantial potential of these NSs in applications such as photocatalysis and energy conversion.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Liangdi Jiang,Zhouyang Huang,Jiacan Xu,Liqiu Zhang,Ziwen Du
Selectivity is the key for adsorption or recovery of per- and polyfluoroalkyl substances (PFAS) from aqueous environments. In this study, the fluorinated metal–organic frameworks (MOFs) with different fluorine contents were prepared and investigated to evaluate the selective adsorption of an emerging PFAS, sodium p‑perfluorous nonenoxybenzenesulfonate (OBS). Adsorption of OBS increased with the increasing fluorine content of MOFs, and the best fluorinated MOFs showed an excellent selective adsorption capacity. The influence of various co-existing hydrocarbon substances on OBS adsorption was slight. The adsorption amount of OBS was 15-fold to that of the hydrocarbon surfactants (n-caprylic acid). The selectivity was attributed to the fluorinated structures of MOFs whose oil contact angle was up to 101°, and thus the oleophobicity of fluorinated structures made MOFs repel hydrocarbon compounds. Molecular dynamics simulations and density functional theory calculations indicated that the fluorinated structures were able to capture OBS molecules from the long distances (roughly 1–100 nm) via hydrophobic interaction, and then formed a F–F non-covalent interaction which was highly probable to be driven by a dispersion force to further attract OBS fluorinated tails within shorter distances (less than 3.5 Å). The combination of oleophobic and fluorophilic effects contribute to the exclusive selectivity of fluorinated MOFs for OBS molecule.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Ran Chen,Shan Luo,Zifan Song,Youqing Tian,Dai Shi,Beili Lu,Hanyang Liu,Lirong Tang,Guanfeng Lin,Jianghuan Shi,Shunjie Wang,Xingzhong Cao,Biao Huang,Jiashu Yuan,Xinda You
Cellulose acetate (CA), a biomass-derived material for desalination membranes, faces challenges in nanofiltration-based desalination due to its weakly charged hydroxyl groups. Here we report gradient-charged CA membranes (GC-CAMs) engineered through the surface segregation of ionic covalent organic framework nanosheets (iCOFNs). Pre-evaporation drives sulfonated iCOFNs to migrate from the bulk to the surface due to the density difference between the nanosheets and CA solution, which creates a gradient distribution of iCOFNs and forms GC-CAMs via phase inversion. The charged nanosheets enriched on the front surface increase the membrane charge density from −0.89 to −1.13 mC m −2 while decreasing membrane pore size from 0.74 to 0.68 nm, synergistically enhancing ion exclusion via electrostatic repulsion and size sieving. By positioning the front membrane surface downstream, salt rejection is further improved by mitigating the charge shielding effect. By regulating the pre-evaporation time and iCOFN content, the optimized GC-CAM achieves a Na 2 SO 4 rejection of ∼95 %, which is maintained at ∼90 % over two months. When applied to natural water purification, it reduces total dissolved solids by ∼83 % while moderately removing heavy metal ions. The proposed gradient structure offers a novel approach for the charge engineering of nanofiltration membranes.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Zhipeng Zhang,Jie Chen,Yan Ke,Xi Du,Xiaoqun Qiu,Liming Zhou,Yugao Zhang,Minghui Qiu,Jing Guo,Xu Jiang,Lu Shao
The treatment and reuse of high-salinity dyeing wastewater remains a critical challenge in the cotton textile industry, where lamellar graphene oxide (GO) membranes show significant potentials but are limited by permselectivity and stability of their channels. Herein, the porous covalent organic framework nanosheets (CONs) incorporated GO (GO/CON) membranes with engineered separation nanochannels were fabricated by a continuous rod-coating strategy using Mayer bars. Specifically, the incorporation of porous TpPa-SO 3 H nanosheets into GO membranes enhanced membrane permeability and dye/salt selectivity, attributed to the introduction of additional porous channels and the strengthened electrostatic properties from CONs. This GO/CON membrane exhibits exceptional durability during continuous cross-flow operations exceeding 300 h in high-salinity dyeing wastewater. Furthermore, the high-salinity permeate was successfully reused for dyeing cotton fabrics, producing textiles with minimal color differences, thereby demonstrating both environmental sustainability and economic viability for practical industrial applications.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Tiemei Li,Xin Zhang,Lichong Duan,Shuhao Cui,Yingyu Chang,Xia Zhang
A new ferrofluid based on hydrophobic deep eutectic solvent and Fe 3 O 4 @NH 2 -graphene oxide was designed, and then used as extraction medium for the extraction and analysis of estrogens in water by coupled with vortex-assisted liquid-liquid micoextraction and high performance liquid chromatography. The morphology, structure, thermal stability and magnetic property of the material were studied by scanning electron microscope (SEM), Fourier Transform-Infrared Spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM). Four estrogens, including estradiol (E2), ethinyl estradiol (EE2), bisphenol AP (BPAP) and hexestrol (HEX), were used as the model analytes. Key parameters related to the ferrofluid preparation and extraction conditions were optimized by single-factor and response surface method. Under the optimal conditions, good linearity (R 2 > 0.99) in the concentration ranges of 0.1–200, 0.2–200, 0.007–200 and 0.15–200 μg/L were obtained for E2, EE2, BPAP and HEX, respectively. The limits of detection for E2, EE2, BPAP and HEX were 0.030, 0.070, 0.002 and 0.05 μg/L, respectively. The established method was successfully applied for the quantification of E2, EE2, BPAP and HEX in urine, environmental water, beverage and package samples. The method was simple, rapid, sensitive and producible.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Le Gou,Zhentao Ping,Liyi Dai,Yuanyuan Wang
Organic acids are commonly used additives in the hydrothermal carbonization (HTC) of sewage sludge (SS). Previous studies have demonstrated that organic acids can effectively increase the carbon content of hydrochar, reduce its nitrogen content, and improve its combustion performance. Due to significant differences in molecular structure and chemical reactivity among organic acids with varying carbon chain lengths, they may exert distinct influences on hydrochar yield, carbon content, and combustion behavior. However, there remains a lack of systematic research on the effects of organic acids with varying carbon chain lengths during the HTC process. In this study, an orthogonal experimental design was employed to investigate the influence of C1 to C9 organic acids on the carbon content of hydrochar under various temperatures (170–230 °C) and concentrations (0.1–0.5 mol/L). The results showed that as the carbon chain length increased, organic acids were more likely to incorporate into the hydrochar structure through chemical reactions, resulting in a gradual increase in both carbon content and calorific value. Furthermore, the addition of long-chain organic acids led to a reduction in nitrogen content and enhancement of the combustion characteristics of the hydrochar. Meanwhile, long-chain organic acids were also beneficial for the recovery of nutrients from the aqueous phase. These findings provide a systematic reference for improving hydrochar quality and promoting aqueous phase resource recovery in the HTC of SS using organic acids.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shan Luo,Ran Chen,Ruiyuan Zeng,Dai Shi,Youqing Tian,Jiamei Sun,Zifan Song,Yuanhui Xiao,Jiashu Yuan,Jianghuan Shi,Haixiong Liu,Hanyang Liu,Beili Lu,Lirong Tang,Biao Huang,Jiande Lin,Meijie Wang,Xinda You
Ionic covalent organic framework (iCOF) nanosheet membranes hold great potential in nanofiltration-based desalination by offering superior chargeability for ion exclusion. However, controllable assembly of iCOF nanosheets into high-performance membranes remains challenging due to the electrostatic repulsion between them. We propose an electrostatic-modulation strategy to reduce the chargeability of iCOF nanosheets by modulating the dielectric properties of the solvent environment, which enables the fabrication of dense laminated charged COF membranes (CCOFMs). By decreasing the solvent dielectric constant from 78.5 (water) to 24.3 (ethanol), the zeta potential of sulfonated COF nanosheets is compressed from −35.8 mV to −3.76 mV. The reduction in chargeability weakens the electrostatic interaction energy between iCOF nanosheets by approximately 500 kJ mol −1 and thereby promoting the formation of a denser laminated structure during subsequent vacuum-assisted assembly. The denser structure of CCOFMs leads to narrowed effective pore size from 0.678 nm to 0.476 nm to enhance ion exclusion by coupling steric hindrance and electrostatic effect. The optimized CCOFM display outstanding rejections of ∼96.3%, ∼95.0%, and ∼80.0% for Na 2 SO 4 , MgSO 4 , and NaCl, respectively, surpassing the benchmark COF membranes. The dense structure also renders CCOFM outstanding stability by maintaining Na 2 SO 4 rejection above 94.7% for over 1000 h, which enables the purification of organic saline wastewater with Na 2 SO 4 rejection of ∼97.3% and tetracycline rejection of ∼99.9%. The electrostatic-modulated assembly of iCOF nanosheets enlightens the precise construction of charged laminated membranes for ion-related separations.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Lingqi Shen,Yuan Yan,Xiaoyan Jiang,Xuerong Yang,Zhihui Zhang,Zuguang Li
As new green solvents, the low volatility of deep eutectic solvents (DESs) limits their development in natural product extraction. In this work, a series of novel lower critical solution temperature (LCST) type temperature-responsive DESs (TRDESs) were prepared and applied to the extraction of carotenoids from tomato. The highest yields (408.85 ± 4.97 μg/g of lycopene, 68.78 ± 2.00 μg/g of β-carotene) were obtained under the following conditions: extractant DES-16 (methyl 1-benzylpiperidine-4-carboxylate: valeric acid: heptanoic acid = 2:1:1), solid-liquid ratio 1:58 g/mL, extraction temperature 68 °C, and extraction time 44 min. Utilizing the temperature response characteristics of TRDESs, the separation of carotenoids and TRDESs was achieved in a mild way. Upon analysis, hydrophilic polysaccharides were simultaneously extracted and retained in water through the recovery experiment. Green Analytical Procedure Index (GAPI) proved the greenness of the method. This work provides new ideas for DESs in the extraction of natural products.
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Light-Science & Applications
·
2025
·Vol. 14
·期 1
·1-13
·
IF 23.4
Zhang Qingkai,Yang Kaiyu,Luo Chengyu,Lin Zhihan,Chen Weiguo,Yu Yongsheng,Hu Hailong,Li Fushan
Perovskite quantum dots light-emitting diodes (PeLEDs) have been developed for next-generation high resolution display applications. However, the hindered charge injection and massive charge trapping due to the insulating and defective surface of quantum dots (QDs) usually lead to a slow rise in electroluminescence (EL) response, which makes it challenging to realize ultra-high refresh rate displays with nanosecond response. Herein, an ionic liquid 1-Butyl-3-methylimidazolium Trifluoromethanesulfonate ([BMIM]OTF) was used to enhance the crystallinity and reduce the surface area ratio of QDs, which effectively decreases defect state and injection barrier at the interface. Therefore, the rise time of EL response with steady-state is successfully reduced by over 75%. We further reduce the capacitance effect by decreasing the light-emitting unit area. Thus, ultra-high resolution (9072 pixel per inch) PeLEDs with light-emitting pixel size of 1.3 μm were realized, achieving a brightness exceeding 170,000 cd/m 2 and an external quantum efficiency up to 15.79%. Moreover, it achieves nanosecond ultrafast response time under steady-state, which is the fastest response time of PeLEDs reported so far. Our work represents the most advanced performance of ultra-high-resolution PeLEDs, and provides in-depth insights into the mechanism of improving their response speed, showing significant potential in high refresh rate active display application.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yingyi Nong,Jisong Yao,Jizhong Song
The mixed-halide CsPbCl 3-x Br x perovskite quantum dots (QDs) have emerged as promising candidates for pure-blue light-emitting diodes (LEDs). However, the widely existing defects in these mixed-halide perovskites, arising from uncontrollable crystallization and low Cl vacancy formation energy, significantly restrict the device performance. Herein, a cation-anion pair-assisted synthesis strategy is proposed to obtain high-quality CsPbCl 3-x Br x QDs. Guanidinium sulfate (GA 2 SO 4 ) is introduced during the synthesis process, in which sulfate anions passivate undercoordinated Pb 2+ defects, effectively reducing the non-radiative recombination, and the guanidinium cations interact with halides on the QD surface via hydrogen bonds, inhibiting the formation of Cl vacancy defects. Benefiting from this synergistic passivation effect of the cation-anion pair, the photoluminescence quantum yield of the QDs increases from 42% to 86%. Meanwhile, the QDs exhibit high crystalline quality, which facilitates the transport of charge carriers. Resultantly, the QLEDs achieve a record external quantum efficiency of 24.9% at 470 nm, showing a 1.6-fold improvement over that of the control devices. This work demonstrates that a synergistic ion-pair passivation strategy is a practical design approach for realizing efficient and stable pure-blue perovskite LEDs.
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JOURNAL OF SUPERCRITICAL FLUIDS
·
2025
·
IF 4.4
Yao Peng,Wenyu Zhong,Weizhong Zheng,Dongdong Hu,Xiaojia Wang,Jiayang Sun,Xinyu Zhuo,Yichong Chen,Ling Zhao
Carbon dioxide (CO 2 ) water suspension foaming can produce complex special-shaped components foamed products with microcellular and low-density bead foams. The traditional water suspension foaming process has wastewater, complexity, high energy consumption, and hydrolysable polymer degradation. Based on the above problems, the water-free bead foaming process in spouted bed is developed, which has simple process and high efficiency. However, due to the differences in molecular structure of different polymers and the different plasticization effect of CO 2 on polymers, there are differences in the adhesion behavior of polymer beads in the foaming process. In this work, thermoplastic polyurethane (TPU) beads were selected as raw materials, and the effects of different CO 2 -philic surfactants on the adhesion and foaming behavior of TPU beads were investigated. Molecular dynamics (MD) simulations and experiments showed perfluorooctanoic acid (PFOA) can inhibit the adhesion of TPU foamed beads. Under 4 wt% PFOA, non-adhered TPU foamed beads with expansion ratio is 10.75, cell size is 49.83 μm and cell density is 4.30 × 10 7 cells/cm 3 can be prepared. Then, the shrinking TPU foamed beads are foamed twice by nitrogen (N 2 ), and expansion ratio is over 14 times, cell size is 60.06 μm, and cell density is 5.23 × 10 7 cells/cm 3 . Through this method, achieving non-adhered TPU foamed beads characterized by high expansion ratio, high cell density, and small cell size. Finally, PFOA was efficiently recovered and reused via flash evaporation, achieving a recovery ratio exceeding 97.69 %. It’s worthy that minor losses may still present environmental and health concerns.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Zhibin Xu,Zhiheng Xu,Sirui Zhu,Xuebin Zhang,Dandan Yang,Xiaobin Tang
Two-dimensional CsPbX 3 perovskite nanosheets serve as unique platforms for polarized emission modulation. However, the integrated control mechanism of bandgap engineering and polarized optical properties remains largely unexplored. In this study, we demonstrated a halogen gradient strategy using iodine-doped CsPbBr 3-x I x nanosheets with polymer encapsulation, enabling simultaneous band structure modification and optical anisotropy regulation. The iodine gradient enabled continuous tuning of the degree of polarization (up to 0.39) across a broad-spectrum range of 520–677 nm. Notably, radiation-induced polarized emission was observed in perovskite nanostructures under X-ray excitation, revealing directional transport behavior under high-energy stimulation. This work presents a detailed systematic investigation into X-ray-induced linearly polarized luminescence from perovskite nanosheets. The polarization-sensitive response detector exhibited enhanced current ratios, which can be attributed to iodine-induced defect suppression. This work not only advances the field of polarized optoelectronics but also establishes new opportunities for the detection of X-ray polarization response.
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