LANGMUIR
·
2026
·
IF 4.4
Patima Nizamidin,Huifang Chen,Yanmei Li
Gas adsorption selectivity improvement of a metal–organic framework (MOF)-based sensor presents a significant challenge. This study addresses the enhancement of gas adsorption selectivity in MOFs by introducing bimetallic centers. The bimetallic zinc/niobium MOF (Zn/Nb–NDI–BMOF) was synthesized through the solvothermal coordination of Zn and Nb metal sources with the 1,4,5,8-naphthalene tetracarboxydiimide (NDI) organic ligand. Zn/Nb–NDI–BMOF formed a hexagonal-platelet structure with a high refractive index and optical transparency after 5 h of solvothermal growth. In comparison to Zn–NDI–MOF and Nb–NDI–MOF, the developed Zn/Nb–NDI–BMOF film displayed a unique response to H2S in the presence of SO2, NO2, CO2, and HCl gases when incorporated into an optical waveguide sensor (OWGS). The enhancement in the gas-sensing selectivity of Zn/Nb–NDI–BMOF can be attributed to the bimetallic synergistic effect, which alters the framework structure and pore sizes and consequently modifies the optical configuration and activity. Upon exposure to H2S, it is susceptible to proton transfer between H2S and Zn/Nb–NDI–BMOF. Features such as a fast response (response time less than 2 s), a wide detection range (100 ppm to 1 ppb), good reproducibility, a low detection limit (0.69 ppb), thermal stability, and humidity resistance of the Zn/Nb–NDI–BMOF film OWGS for H2S make it a promising candidate for potential applications in environmental monitoring and food freshness assessment.
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DOI
PubMed
高影响因子
ACS Applied Engineering Materials
·
2026
·
IF 3.5
Zehui Yao,Xinhai Zhang,Yi Wang,Xiaozu Wang,Zhaohui Wang,Zhaoliang Cui
Polyimide (PI) membranes face a trade-off between permeability and selectivity, limiting their gas separation applications. To address this, we synthesized 6FDA-DAM/DABA(DAM:DABA = 3:2) PI and two-dimensional COF-1 nanofillers, fabricating hollow fiber mixed matrix membranes (MMMs) via dry-jet wet-spinning. Under optimized conditions (25 cm air gap, 50 °C spinneret temperature, 30 °C NMP coagulation bath), the 10 wt % COF-1 incorporated membranes achieved optimal performance: tensile strength of 15.34 MPa; H2 and CO2 permeances of 79.3 GPU and 54.3 GPU, and ideal selectivities of 187.9 for H2/CH4 and 128.7 for CO2/CH4, respectively. The results demonstrate that the incorporation of COF-1 modifies solvent exchange during spinning, necessitating targeted optimization of spinning parameters to coordinate membrane structure and performance.
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DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2016
·
IF 1.112
Chaohang Xu,Deming Wang,Hetang Wang,Yi Zhang,Guolan Dou,Qingguo Wang
Foamability, foam initial liquid volume, and bubble size of fatty alcohol sodium polyoxyethylene ether sulfate (AES) surfactant solution were studied with and without the addition of sodium carboxymethylcellulose (CMC) at different gas flow rates, using a sparging method. The generation time decreased with increasing gas flow rate. At low gas flow rates, the added CMC greatly enhanced the foamability by preventing bubble collapse. The initial liquid volume of the foam first increased rapidly, and then gradually decreased. Increasing the CMC concentration increased the initial liquid volume of the foam. The mean bubble diameter first clearly decreased, then increased slowly with increasing gas flow rate. CMC showed different effects on bubble size at high and low gas flow rates. Adsorption of CMC on AES molecules forms a network structure and improves bubble film stability, which can explain the above results. These findings provide guidelines for generating foam with excellent properties suitable for coal mine dust control by adjusting the gas flow rate and the concentration of the added water-soluble polymer.
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DOI
高影响因子
Energy Technology
·
2015
·Vol. 3
·期 8
·815-819
·
IF 2.824
Yao Liu,Biyu Chen,Yulong Chen,Shihao Zhang,Weiqi Guo,Yuanhao Cai,Bien Tan,Weixing Wang
Methane is important in future energy schemes. The main strategies for storing and transporting methane are compression, liquefaction, and physical adsorption in synthetic porous materials. Here, we show that methane can be stored in a hydrated form using natural amino acids such as leucines as effective promoters to form methane hydrate with a high formation rate and a high capacity. In addition, the methane hydrate formed from the L -leucine solution dissociates without foaming phenomenon. We also showed that the heavier hydrocarbons in natural gas can enhance the promoting effect of L -leucine.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jiajia Fan,Jinyuan Hu,Shengchi Bai,Xifan Li,Guijing Chen,Jia Chen,Sheng Chen,Baicang Liu
Developing high-performance anti-fouling ultrafiltration membranes is essential for treating shale gas wastewater (SGW), addressing its severe membrane fouling issues. This study reports the fabrication of polyvinylidene fluoride (PVDF)/PVDF-graft-poly(ethylene glycol) methyl ether methacrylate (PVDF-g-PEGMA) blended hollow fiber membranes via non-solvent induced phase separation for direct treatment of SGW. The influences of the copolymer doping ratio on microstructure, chemical composition, and hydrophilicity were systematically investigated. The addition of PVDF-g-PEGMA contributed to a favorable membrane morphology and significantly improved hydrophilicity. The 20 wt% PVDF-g-PEGMA modified membrane achieved a 64.4% increase in pure water flux while retaining over 95.9% rejection for both humic acid and bovine serum albumin. More importantly, in long-term filtration of SGW, the modified membrane demonstrated a stable permeation flux of ~30.4 L·m −2 ·h −1 , surpassing the performance of the unmodified membrane by 300% and reducing the cost of water treatment for unit flux by 17.6%. Analysis based on the extended Dragun-Landau-Verwey-Overbeek theory indicated that the incorporation of PVDF-g-PEGMA effectively reduced the attractive interaction energy between the membrane and pollutants. These results demonstrate that the PVDF-g-PEGMA blending modification not only significantly enhanced membrane permeability and anti-fouling performance under challenging real wastewater conditions but also achieved sustained flux and superior anti-fouling behavior during lab-scale SGW operation, thereby enabling water reuse with reduced maintenance demand.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Paifeng Luo,Shengwen Zhou,Yugang Zhou,Wei Xia,Lin Sun,Jigui Cheng,Chenxi Xu,Yingwei Lu
Over the past few years, significant attention has been focused on HC(NH2)2PbI3 (FAPbI3) perovskite due to its reduced band gap and enhanced thermal stability compared with the most studied CH3NH3PbI3 (MAPbI3). However, FAPbI3 is sensitive to moisture and also encounters a serious structural phase-transition from photoactive α-phase to photoinactive δ-phase. Herein, we first develop a novel FAI gas-phase-assisted mixed-cation compositional modulation method to fabricate CsxFA1–xPbI3 perovskite solar cells (PSCs), and realize the structural stabilization of α-phase FAPbI3 with the incorporation of smaller inorganic Cs+ ions. Through the setting of different Cs+ contents (x = 0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.50) along with a moderate FAI vapor deposition process, a series of CsxFA1–xPbI3 films with consistent compositions are fabricated, which perfectly resolves the main blocking problems of the conventional solution approach, such as difficulty in compositional control and rough film morphology. Meanwhile, we find that the Cs+ amount is crucial for generating phase-pure CsxFA1–xPbI3 (0 < x < 0.30) while higher contents result in phase segregation. Consequently, the optimum amount of Cs+ (x = 0.15) is verified, and Cs0.15FA0.85PbI3 shows the smallest unit cell volume and good moisture-resistant feature. Correspondingly, the highest power conversion efficiency (PCE) of 14.45% based on Cs0.15FA0.85PbI3 PSCs is successfully achieved in this work.
研究领域:
材料科学
·
光伏技术
·
钙钛矿太阳能电池
·
薄膜制备
·
能源材料
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Xue Li,Xue Zhao,Jiapei Lv,Xiuxiu Jia,Shuxing Zhou,Yimin Huang,Fengqin Chang,Hucai Zhang,Guangzhi Hu
Electrochemical techniques have shown advantages for the removal of low-concentration nitrate. Here, copper oxide nanosheets were grown on self-supporting nickel foam (NF) to prepare electrodes (CuO/NF), which realized the rapid and highly selective conversion of nitrate pollutants in sewage into nontoxic and harmless N 2 . The CuO/NF afforded 100% NO 3 – removal within 100 min and 99.53% selectivity for N 2 at –50 mA without producing a lot of by-products (NO 2 – , NH 4 + , and N 2 H 4 ). Furthermore, 81.8% of NO 3 – was removed under the given conditions after six experimental repetitions. These results suggest that the catalyst has excellent electrochemical stability. The performance of CuO/NF for the electrocatalytic removal of NO 3 – in simulated wastewater (which contained Cl – and SO 4 2– ) was almost unaffected. Because of the high efficiency, high stability, and low cost of CuO/NF, this catalyst is practical for the removal of nitrate for wastewater purification.
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Peng Yan,Xiang Li,Deyun Ma,Lijun Li,Yuwen Lan,Zhiyong Li,Xiaoting Lu,Manqi Yang,Fenglan Liang
An ultramicropore MOF , {[Co 6 (5-MIA) 5 (tmbpy)(μ 3 -OH) 2 (ethanol) 2 ]∙(ethanol) 2 } n ( 2 ) (5-H 2 MIA= 5- methoxyl-isophthalic acid; tmbpy = 3,3′-dimethyl-4,4′-bipyridine), was rationally designed and constructed. The gas sorption behavior of 2 for C 2 H 2 , CO 2 , CH 4 , CO, and N 2 was investigate by experiments. The C 2 H 2 and CO 2 uptakes of the activated sample ( 2a ) were up to 64.87 cm 3 g −1 and 63.97 cm 3 g −1 at 273 K (100 kPa), respectively. Specifically, 2a possesses 3.5 Å of aperture and multi-functional sites (open Co 2+ sites and methoxy groups), resulting in the synergistic effect of size sieving and host-guest interactions for selective adsorption of carbon dioxide (or acetylene). The IAST selectivities of C 2 H 2 /CH 4 (1:1) and CO 2 /CH 4 (1:1) on 2a were 26.6 and 12.3 at ambient temperature and 100 kPa, respectively. The easy regeneration, outstanding humid/thermal stability, and good reusability, make it a promising candidate for industrial application of the separation of C 2 H 2 /CH 4 , CO 2 /CH 4 , CO 2 /N 2 and CO 2 /CO.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Hang Yu,Tieyan Li,Xingda Yang,Chunxi Li,Jianguo Mi,Hong Meng,Junsu Jin
In order to improve the heat transfer efficiency of the shaped activated carbon in CO 2 adsorption, we proposed a rapid CO 2 adsorption–desorption approach by coating the outer surface of the metal tube with a hydrophobic carbon layer. The coating layer was prepared by carboxylated cellulose nanofibers (CNF) as the binder, coconut shell-activated carbon as the carrier, and methyltrimethoxysilane (MTMS) as the hydrophobic modifier. The oxygenated groups can increase its surface polarity and adsorptivity for the weakly polar small molecules like carbon dioxide. The equilibrium adsorption capacity of SAC-6-1.0 for CO 2 in dry (15 vol% CO 2 ) and wet flue gas (15 vol% CO 2 + 4.7 vol% H 2 O) is 39.4 mg/g and 34.3 mg/g, respectively, at 40 °C and 1.0 bar, which is 54.5% and 382.4% higher than that of the original activated carbon. After 10 cycled reuses, over 97% of its adsorption capacity can be retained. The CO 2 adsorption performance of SAC-6-1.0 is better than most of the oxygenated and sulfur-doped activated carbons, albeit slightly worse than that of nitrogen-doped ones. The present hydrophobic carbon coating approach is of great industrial application in the field of CO 2 capture and other gas separation.
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Wancen Xie,Guijing Chen,Chen Chen,Zhaoyang Song,Qidong Wu,Lun Tian,Zhongde Dai,Songmiao Liang,Peng Tang,Xiang Zhang,Jun Ma,Baicang Liu
Large-scale nanofiltration (NF) membrane fabrication relies on the use of harmful solvents and dangerous monomers ( e.g. , piperazine and trimesoyl chloride). Herein, we employed greener polydopamine (PDA) and polyethyleneimine (PEI) co-deposition to construct NF selective layer on poly(vinyl chloride) (PVC) substrate prepared by using the green solvent methyl-5-(dimethylamino)-2-methyl-5-oxopentanoate (PolarClean). The metal-organic framework (MOF) UIO-66 was also co-deposited to tune the NF selective layer property by exploiting hydrogen bonds , Π-Π interaction, and coordination bonds between oxygen functional groups and zirconium (Zr) of UIO-66 and the PDA-PEI complex, as well as its intrinsic properties of high hydrophilicity and positive charge. It also improved the surface area of NF selective layer, contributing to higher permeability. However, excessive dosage, higher than 0.1 g/L, promoted PDA aggregation, thus reducing its deposition on membrane surfaces and causing defects. When the dosage was 0.05 g/L, the ternary coated NF membrane exhibited the best property with low molecular weight cut-off (MWCO, ∼350 Da), adequate hydrophilicity, high permeance (3.17 ± 0.3 L m −2 h −1 bar −1 ), and high MgCl 2 rejection (>80%). When used for shale gas wastewater (SGW) treatment, the ternary coated membrane showed removal rates of 58.5% for dissolved organic carbon , 71.1% for fluorescent organics, and 6.2% for total dissolved solids, allowing the effluent to meet the standards of SGW internal reuse. This work helps to inspire the next-generation sustainable NF membrane fabrication.
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DOI
高影响因子
JOURNAL OF FOOD SAFETY
·
2022
·Vol. 43
·期 2
·e13027
·
IF 2.449
Kun Wang,Linhuanyi Wu,Yongshi Li,Hui Li
In this study, the halloysite nanotubes (HNT) were incorporated into chitosan (CS) to prepare CS/HNT composite film by solution-casting method. Different HNT contents were studied in relation to the morphological, optical, mechanical, barrier and thermal properties of CS/HNT composite films. After incorporation of HNT, the CS/HNT composite films showed improvement in UV light shielding, barrier against water vapor and oxygen, mechanical strength and thermal stability as well as achievement of ethylene scavenging property. Especially, when 5 wt% HNT were added, more homogenous distribution of HNT in CS matrix was observed by SEM, resulting in 169.9% increase in tensile strength, 52.94% decline in oxygen permeability and 4.07 times enhancement in the ethylene scavenging capacity at 100 kPa pressure compared with pure CS film. Moreover, the obtained film with 5 wt% HNT effectively maintained the freshness of bananas and cherry tomatoes under ambient conditions. This study demonstrated that the CS/HNT composite films could be used as active food packaging material to extend the shelf-life of fresh fruits and vegetables.
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DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Shengji Wu,Yalun Ma,Wangsheng Yu,Hui Wang,Wei Yang,Lei Che,Zhongxi Han
How to enhance the SO 2 tolerance of transition metal oxide-supported activated carbon is one of the hottest issues in the field of mercury capture from flue gas. Addition of a foreign metal ion to prepare bimetallic adsorbent is a common method of improving the SO 2 tolerance of adsorbent. However, this approach suffers from high cost and a complex preparation process. In this study, CeO 2 - and Co 3 O 4 -supported activated carbon ( m %CeO 2 /AC and m %Co 3 O 4 /AC), with various loading values of active center, were prepared by an incipient wetness impregnation method, and their SO 2 tolerances were compared. The mercury removal performance and SO 2 tolerance of both CeO 2 /AC and Co 3 O 4 /AC could be remarkably improved through increasing the loading amount of the active center. Co 3 O 4 /AC exhibited high affinity with SO 2 , and the chemisorbed oxygen in Co 3 O 4 would be largely consumed, when SO 2 was present in the flue gas, resulting in a significant decrease of mercury removal efficiency. The mercury removal efficiencies of 20%CeO 2 /AC, 40%CeO 2 /AC and 60%CeO 2 /AC were 86.1%, 93.7% and 93.7%, respectively, during removal of mercury from flue gas at 150 °C in the presence of SO 2 . 20%CeO 2 /AC was the optimal adsorbent for mercury capture from flue gas, owing to its excellent mercury removal efficiency, strong SO 2 tolerance and relatively lower cost. The mercury species formed over spent 20%CeO 2 /AC were HgO and HgSO 4 . The HgO was generated through the reaction of mercury and chemisorbed oxygen, while the formation of HgSO 4 was due to the reaction between mercury, SO 2 and chemisorbed oxygen. The regeneration investigation indicated that the activity of spent 20%CeO 2 /AC could be almost fully recovered through a temperature-programmed decomposition and desorption process. The present study showed that the SO 2 tolerance of CeO 2 /AC could be easily improved through regulation of the loading amount of the active center.
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高影响因子
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