Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2024
·
IF 3.9
Kashif Nawaz Khattak,Maosen Zhang,Caixia Deng,Shuang Li,Ling Jiang,Pran Gopal Karmaker,Xiupei Yang
In this work, the hybrid material NH 2 -MIL-125(Ti)@TpPa-NO 2 was synthesized by grafting an amino-functionalized titanium-based metal–organic framework (NH 2 -MIL-125(Ti)) with 2,4,6-tri(4-pyridyl)-1,3,5-triazine-nitro (TpPa-NO 2 ) moieties. The resulting composite material exhibited remarkable removal efficiency owing to the synergistic effects derived from the combination of the NH 2 -MIL-125(Ti) and TpPa-NO 2 components. The material demonstrated excellent stability and recyclability, making it a promising candidate for the treatment of wastewater containing rhodamine-B (Rhd-B). Some characterization techniques were employed to elucidate the structural features and surface morphology of the hybrid material. The adsorption capacity of NH 2 -MIL-125(Ti)@TpPa-NO 2 for Rhd-B dye was evaluated, and the results revealed an exceptional removal efficiency of 99.96 % and a high adsorption capacity of 25.54 mg/g, highlighting the superior adsorption performance of the material. The adsorption process was found to follow Langmuir isotherm and pseudo-second-order kinetics, indicating that chemisorption is the predominant mechanism governing the uptake of Rhd-B dye onto NH 2 -MIL-125(Ti)@TpPa-NO 2 .
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Shumin Xie,Mang Niu,Xingyun Li,Yang Lei,Huanfang Zhang,Shuai Xu,Deyu Wang,Sameh M. Osman,Zhi Peng,Yusuke Yamauchi
The development of high-performance electrocatalysts that rival Pt catalysts is crucial for efficiently driving the hydrogen evolution reaction (HER) to produce H2. Herein, we engineer sophisticated interfacial modulation of the Ru catalysts by constructing B, N co-doped porous carbon confined ultra-small MoC quantum dots (MoC@BNC) as an advanced catalyst carrier and stimulator. Combined experimental and theoretical calculations prove enhanced electron interaction between the Ru catalysts and the MoC quantum dots. Additionally, the B, N co-doped carbon substrate further refines the electronic structure of MoC, reinforcing the modulation of Ru catalysts. The Ru/MoC@BNC catalyst embodies a boosted H2O dissociation ability with a lowered H bonding strength, which promises an outstanding HER performance with an overpotential of 14 mV at 10 mA cm−2 in an alkaline solvent. Furthermore, robust catalytic stability is achieved with almost zero deterioration after the cycling test. This result exemplifies the importance of interfacial manipulation of the Ru catalysts to promote HER catalytic performance.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Rui Fan,Jingjing Dong,Xiaoxiao Li,Ying Chen,Zhengyu Jin,Yuxiang Bai
Reuteran is a functional homopolysaccharide comprising major (α1 → 4) and interspersed (α1 → 6) linkages whose properties and functions are directly associated with the structure. In order to enrich the structural variety and application prospects of reuteran, a GtfB-type 4,6-α-glucanotransferase from Limosilactobacillus mucosae L24-B (LmGtfB), which can synthesize reuteran with high-content linear (α1 → 6) linkages, was screened. LmGtfB exhibited 4,6-α-glucanotransferase activity against starch or dextrin and can synthesize both linear and branching (α1 → 6) linkages, which offered advantages in terms of source and cost. The as-produced reuteran had the highest content of linear (α1 → 6) linkages (19% in the methylation result) among the reuterans synthesized by other GtfB-type 4,6-α-glucanotransferases. A purification method was established and applied to the extraction of the core structure of the LmGtfB products. 1H NMR and enzymatic hydrolysis revealed that the core structure contains 46.24% (α1 → 6) linkages and alternating (α1 → 4)/(α1 → 6) linkages, which was formed by enzymatic transfer of maltose.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Haoyu Ma,Jiaozhu Wu,Chengzhe Gao,Silin He,Pengjian Gong,Qiwu Shi,Zhao Wang,Guangxian Li,Chul B. Park
In the context of the future sixth-generation (6G) communication system, the development of multi-functional materials with ultra-low dielectric permittivity ( D k ) and ultra-low dielectric loss ( D f ) is of paramount importance for the design of terahertz (THz) frequency electromagnetic wave transmission devices. In this work, polyimide- block -polydimethylsiloxane (PI- b -PDMS copolymer, PIC) material with low D k , high flexibility and high supercritical fluid foaming ability was fabricated via copolymerization. Additionally, core–shell SiO 2 @BN nanofillers were synthesized by condensing tetraethyl orthosilicate (TEOS) on hexagonal boron nitride (BN) nanofiller surface. Subsequently, flexible polyimide/SiO 2 @BN foam was fabricated via supercritical N 2 foaming. The resulting PIC/SiO 2 @BN nanocomposites exhibit exceptional flexibility and impressive thermal resistance (thermal decomposition temperature 472.2 °C). Notably, the incorporation of core–shell SiO 2 @BN nanofillers leads to the formation of a molecular interface anchoring structure through hydrogen bonding effect. This structure effectively reduced the mobility of the flexible PIC polymer chains on the SiO 2 @BN nanofiller surfaces. Consequently, the porous PIC/SiO 2 @BN materials show a low shrinkage ratio, low dielectric property ( D k = 1.21, D f = 0.012 at 1 THz), excellent THz transmission rate (91.4 %) and long distance 6G THz signal coverage (125.99 m). Furthermore, porous PIC/SiO 2 @BN materials show superior flame-retardant and thermal infrared stealth properties.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 85
·53996-54001
·
IF 3.108
Anna Zheng,Ling Su,Zheng Li,Guijin Zou,Xiang Xu,Yong Guan
To break through the industrial development bottlenecks of anionic polymerization in the field of polar monomers, poly n-hexyl methacrylate (PHMA) was prepared at 0 °C, 30 °C, and 60 °C with potassium tert-butoxide (t-BuOK) as the initiator in tetrahydrofuran (THF) and the conversions were almost complete. Gel permeation chromatography (GPC) analysis of poly n-hexyl methacrylate indicated that t-BuOK existed in numerous states when dissolved in THF, including different types of association and ion-pairs. A series of block copolymers of n-hexyl methacrylate (n-HMA) and methyl methacrylate (MMA), PMMA-b-PHMA (Mn 8200–16 200) and PHMA-b-PMMA (Mn 19 100–9500) were synthesized at 0 °C, and conversions were close to 100%. The results of dynamic mechanical analysis (DMA) indicated that there were two glass transition temperatures, −10 to 0 °C for the PHMA block and 100 to 110 °C for the PMMA block. Furthermore, the competing behaviors of n-HMA and MMA in copolymerization were investigated by one-shot feeding of two types of monomers at 0 °C, 30 °C, and 60 °C. The kinetics curves and 13C-NMR analysis of the copolymers indicated that the polymerization of n-HMA in the copolymerization was significantly dominant over that of MMA at set temperatures. The results in this study provided the possibility to realize anionic polymerization of methacrylate esters on a commercial scale.
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 4
·2718-2725
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IF 3.201
Fan Yang,Yan Cao,Zhuo Chen,Xing He,Liqiang Hou,Yongfeng Li
Boron and nitrogen co-doped graphene-like carbon (BNG) is a metal-free catalyst that has been synthesized by combining ball-milling with thermal treatment. Firstly, the edge-selectively-functionalized graphene nanoplatelets (EFGnPs) were prepared by ball milling of the pristine graphite, which can facilitate boron incorporation. BNG catalysts with a high content of boron and nitrogen can then be obtained by pyrolysis of a mixture of EFGnPs and boric acid. We found that the reduction of nitroarenes can be catalyzed using a low BNG loading and a small amount of N2H4 in ethanol to form aminoarenes in high yields. The type of boron species in the BNG catalyst has an important effect on the reduction reaction. Furthermore, the catalyst containing the most B/N shows the highest catalytic activity during the reduction of nitroarenes, indicating that the doped B/N within the BNG is a key active site in impelling this reaction. Moreover, the BNG catalyst can be used six times, and no dehalogenation phenomenon occurs during the reduction process for halogen-substituted nitroarenes in contrast to the case when conventional metal catalysts are used.
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高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Qiang-Qiang Ma,Peng Zhou,Yizhen Liu,Zuowei Xie
Transition metal catalyzed selective cage B–H functionalization of carboranes has made significant progress in recent years, giving rise to the efficient synthesis of a large variety of cage B-functionalized carboranes including alkenylation, arylation, alkynylation, borylation, hydroxylation, acyloxylation, amination, and halogenation. However, the mechanisms of these catalytic B–X coupling reactions are not well understood. Herein, we describe the isolation and characterization of the catalytically relevant o-carborane based palladium(II) metallacycle, disclosing the details of Pd-catalyzed B–H functionalization of o-carboranes. As a result, highly selective catalytic B(3,6)-dihalogenation, -dimethylation, and -diarylation of o-carboranes have been achieved.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Qihang He,Lei Wang,Feng Xiao,Rong Su,Yu Jiang,Lichuan Chen,Zeyi Wang,Bin Jia,Ping He,Chao Chen,Yali Zeng,Yun Zhou,Bin Tang
The design of advanced noble-metal-free electrocatalysts with high activity and good stability for the hydrogen evolution process (HER) is both appealing and challenging. Herein, cauliflower-like Co–B–P nanoparticles anchored on multi-layered g-C 3 N 4 nanosheets (Co–B–P/g-C 3 N 4 ) are fabricated by a facile electroless deposition method at room temperature . The effect of P/B ratios on electrocatalytic performance of ternary Co–B–P/g-C 3 N 4 catalysts for HER is fully investigated in 1.0 M KOH solution. Due to both the synergetic effect among P, B and Co, and the support of multi-layered g-C 3 N 4 nanosheets , ternary Co–B–P/g-C 3 N 4 catalyst exhibits satisfactory electrocatalytic HER performances. The onset overpotential for the best ternary Co–B–P/g-C 3 N 4 catalyst is only 93 mV, whereas it is 173 mV for binary Co–B/g-C 3 N 4 catalyst. When current density achieves 10 mA cm −2 and 40 mA cm −2 , the required overpotentials for ternary Co–B–P/g-C 3 N 4 catalyst are 174 mV and 226 mV, respectively, which are much lower than those of binary Co–B/g-C 3 N 4 catalyst (261 mV and 327 mV). Furthermore, the stability test indicates that ternary Co–B–P/g-C 3 N 4 catalyst possesses a favorable long-term electrochemical stability under alkaline condition. The satisfactory electrocatalytic performances of as-prepared ternary Co–B–P/g-C 3 N 4 catalyst suggest that it is a promising candidate to substitute noble-metal based catalysts for HER.
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TALANTA
·
2024
·
IF 5.6
Chengchen Pang,Bei Yuan,Keyun Ren,Haitao Xu,Kunying Nie,Chunlei Yu,Zhanli Liu,Yanyan Zhang,Sibel A. Ozkan,Qingqing Yang
In preparing monoclonal antibodies by hybridoma cell technology, the quality of B lymphocytes used for cell fusion directly affects the sensitivity of monoclonal antibodies. To obtain B-lymphocytes producing high-quality specific antibodies for cell fusion during the immunization phase of the antigen, we prepared a TH2-Cell stimulatory delivery system as a novel adjuvant. Astragalus polysaccharide has a good ability to enhance antigenic immune response, and it was encapsulated in biocompatible materials PLGA as an immunostimulatory factor to form the delivery system (APS-PLGA). The preparation conditions of APSP were optimized using RSM to attain the highest utilization of APS. Immunization against ZEN-BSA antigen using APSP as an adjuvant to obtain B lymphocytes producing ZEN-specific antibodies for cell fusion. As results present, APSP could induce a stronger TH2 immune response through differentiating CD4 T cells and promoting IL-4 and IL-6 cytokines. Moreover, it could slow down the release efficiency of ZEN-BSA and enhance the targeting of ZEN-BSA to lymph nodes in vivo experiments. Ultimately, the sensitivity of mouse serum ZEN-specific antibodies was enhanced upon completion of immunization, indicating a significant upregulation of high-quality B lymphocyte expression. In the preparation of monoclonal antibodies, the proportion of positive wells for the first screening was 60%, and the inhibition rates of the antibodies were all similar (>50%). Then we obtained the ZEN monoclonal antibody with IC50 of 0.049 ng/mL, which was more sensitive than most antibodies prepared under conventional adjuvants. Finally, a TRFIAS strip assay was preliminarily established with a LOD value of 0.246 ng/mL.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 37
·15032-15038
·
IF 5.7
Haoran Wang,Jiahao Jiao,Abudukadi Tudi,Shilie Pan,Min Zhang
Two borates, K3Al2B11O21 (KABO) and K3Al2MoB9O21 (KAMBO), with edge-sharing [BO4] (ES-[BO4]) tetrahedra and different B–O configurations in one structure, were rationally designed and prepared at atmospheric pressure by introducing covalent tetrahedra. KABO is the first borate identified to have ES-[BO4] tetrahedra and two different dimensional B–O groups, namely, isolated [B6O12] groups with ES-[BO4] and one-dimensional infinite chains. In addition, KAMBO is a rare borate that features ES-[BO4] tetrahedra and two distinct isolated B–O groups ([B6O12] and [B3O6]). The discovery of these two compounds not only enriches the structures of borates, but also suggests a novel method for creating borates with ES-[BO4] tetrahedral structures and flexible B–O configurations at atmospheric pressure.
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Soft Matter
·
2012
·Vol. 8
·期 46
·11644-11653
·
IF 4.39
Zhangwei Wang,Hengjie Lai,Peiyi Wu
The assembly properties, thermal phase behavior and microdynamics of poly(NIPAM-b-BVImBr), poly(N-isopropylacrylamide)-b-poly(1-butyl-3-vinylimidazolium bromide), in aqueous solution are investigated by dynamic light scattering (DLS), turbidity measurements and FTIR spectroscopy in combination with two-dimensional correlation spectroscopy (2Dcos) and the perturbation correlation moving window (PCMW) technique. In particular, the influence of the introduction of the poly(BVImBr) segment on the solution properties of the block copolymer has attracted our attention: a core–shell micelle structure forms, consisting of a relatively hydrophobic core of poly(BVImBr) and a hydrophilic shell of PNIPAM; the phase transition temperature increases, due to one more step in the dehydration process originating from the alkyl side chains of the poly(1-butyl-3-vinylimidazolium bromide) (PIL) segment; what's more, a stronger hysteresis during the heating–cooling cycle, closely related to the recovery process, is observed. It reveals that the hydrogen bonds of CO⋯D–N among the micelles formed during heating are harder to remove, thus, the reconstruction of the CO⋯D–O–D hydrogen bonding and the recovery hydration process for the C–H groups during cooling are prevented due to the compact and regular micelle structure. More interestingly, the CO groups interact with the N–D groups at room temperature because of the existence of the micelle structure, which is regarded as intra-micelle hydrogen bonding; above the LCST, hydrogen bonds of the CO⋯D–N among the aggregated micelles called inter-micelle hydrogen bonding occur.
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APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Chengqun Xu,Feng Long Gu,Honghai Wu
A BiOCl-Mt material assembled from BiOCl and Na-montmorillonite (Na-Mt) was characterized by XRD , FT-IR, TEM, XPS and UV–vis DRS . Na-Mt was clearly demonstrated to be capable of improving BiOCl's photocatalytic performance. The focus was placed on the evaluation of BiOCl-Mt in the terms of photocatalytic activity for cationic Rhodamine B (RhB) and anionic Orange G (OG). Both can be removed more efficiently using BiOCl-Mt compared with pure BiOCl under ultraviolet light irradiation. Although h v b + and O 2 − are the two primary reactive species, the improved photocatalytic degradation performance is primarily attributed to the enhanced separation of photogenerated charge carriers in the catalyst. The Bronsted acidity derived from montmorillonite acid sites and the dissolved oxygen in the solution are capable of promoting dye photocatalysis because they effectively capture the photogenerated electrons. Under optimized conditions, TOC mineralization with rates of 82.3% for RhB and 85.9% for OG was obtained in a BiOCl-Mt catalysed photocatalysis process. The mechanism responsible for the oxidative decomposition of the two different dyes is primarily hole-driven. BiOCl-Mt was stable during the process, with its structures remaining almost unchanged after it was recycled three times. Therefore, BiOCl-Mt will have a promising worldwide application in dye-containing wastewater treatment .
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