Molecular Catalysis
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2017
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IF 0
Ruiying Wang,Jianjia Wang,Huimin Zi,Yongmei Xia,Haijun Wang,Xiang Liu
Zr(IV)-salphen-MCM-41 was prepared by immobilizing a zirconium(IV) Schiff base complex onto the surface of MCM-41. The structural properties of the heterogeneous catalysts were characterized by FT-IR, UV, TG, XRD, SEM, TEM, BET, EDX, CO 2 -TPD, NH 3 -TPD and ICP-OES. Studies on the catalytic properties of the immobilized Zr(IV)-Schiff base complexes were performed using the reduction and cyclization of ethyl levulinate (EL) to γ-valerolactone (GVL) with isopropanol as the hydrogen source. Various reaction parameters, such as temperature, reaction time, solvent and catalyst loading were carefully investigated. The optimal conditions (GVL yield up to 90%) involved the utilization of Zr(Salphen)-MCM-41 as the catalyst in isopropanol. The key to heightened reaction performance was the incorporation of the phenolate and aniline groups in the ligands of bound to Zr. This increased the basicity of the catalyst, which subsequently enhances the efficiency of the transfer hydrogenation reported herein. Meanwhile, the immobilized catalyst can be easily separated and efficiently recycled at least five times without significant loss of activity. Finally, we proposed a plausible reaction mechanism based on experimental and characterization data.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Meng Tian,Xueliang Cui,Chunxu Dong,Zhengping Dong
In this study, a novel catalyst has been prepared through supporting Pd nanoparticles (NPs) on the surface of boehmite (γ-AlOOH) based hollow aluminosilicate microspheres (HAM@γ-AlOOH). The prepared Pd/HAM@γ-AlOOH catalyst has high catalytic activity for the hydrogenation of nitroarenes to their corresponding amino derivatives with high yields at ambient conditions. The high catalytic efficiency is attributed to the large pore size of the flower-like hierarchical flakes structure of HAM@γ-AlOOH, that gives Pd NPs on the support surface easy accessibility. Moreover, the Pd/HAM@γ-AlOOH catalyst can also be easily recycled at least five times without obvious decrease of catalytic activity. This work may provide a useful method for the fabrication of supported noble metal NP-based catalysts on the surface of mesoporous hierarchical structure materials with easy accessibility and superior activity.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hong Li,Diyun Chen,Weixing Han,Jun He,Gang Song,Lingjun Kong,Minhua Su
Wastewater from uranium mining activities is highly acidic and contains uranium, thereby posing severe risks to the ecological environment and human health. Accordingly, uranium purification is extremely crucial. Herein, we delicately designed a novel adsorbent of diethylenetriaminepenta(methylenephosphonic) acid (DTPMP) and meso -SiO 2 modified γ-Fe 2 O 3 (γ-Fe 2 O 3 @SiO 2 @DTPMP, denoted as FSD), and found that the adsorbent can remarkably boost the removal performance of U(VI) under highly acidic conditions. The removal efficiencies of U(VI) by FSD are 90.26 % and 99.81 % in strong acidic solutions of pH = 1.0 and pH = 2.0, respectively, which are much higher than most of the reported adsorbents. Importantly, FSD exhibits high adsorption capacity (51.45 mg/g) and excellent anti-interference, even the wastewater stream contained a lot of organic substances ( e.g. , fulvic acid), cations ( e.g. , K + , Na + , Mg 2+ , NH 4 + , Zn 2+ , Co 2+ , etc.), radioactive nuclides ( e.g. , Cs + and Sr 2+ ). After five cycles, the adsorption efficiency and desorption efficiency of FSD only reduced by 8.83 % and 9.61 %, respectively, which are mainly attributed to the unique structures and good chemical stability of FSD. The removal of U(VI) by FSD is a heterogeneous adsorption process which is dominated by chemical adsorption, mainly involving surface coordination complexation. Multiwfn wavefunction and VMD programs based on density functional theory (DFT) further analyzed and visualized the interaction sites and relative strengths of reactions. The results of detailed characterization analysis and theoretical calculations confirmed that the highly efficient U(VI) removal by FSD is mainly ascribed to the strong coordination of the phosphate groups and amino nitrogen atoms in DTPMP with UO 2 2+ . Therefore, this study provides a promising strategy for the removal of U(VI) in strongly acidic wastewater.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Miaotian Long,Zerui Zhang,Long Yan,Liang Yi
For effectively strengthening the comprehensive properties of intumescent flame-retardant epoxy resins (EPs), a microencapsulating γ-Fe 2 O 3 by polypyrrole (PPy) named PPy-Fe 2 O 3 was synthesized and used as a synergist to simultaneously enhance the flame retardancy, smoke toxicity suppression and mechanical strength of EP composites containing diaminodiphenylmethane modified ammonium polyphosphate (DDP). The results demonstrate that the mixture of PPy-Fe 2 O 3 and DDP exhibits a surprising synergistic effect on strengthening the comprehensive properties of EP composites. Specifically, EP composite containing 0.2 wt% PPy-Fe 2 O 3 and 9.8 wt% DDP achieves the UL94 V-0 rating with a limiting oxygen index (LOI) value of 35.5%, while 10 wt% DDP only imparts a UL94 V-1 rating and a LOI value of 34.0% to EP. Furthermore, 0.2 wt% PPy-Fe 2 O 3 shows a 11.0% reduction in peak smoke production rate and a 12.3% reduction in peak heat release rate of the EP/DDP system. The enhanced fire security of EP/DDP/PPy-Fe 2 O 3 is attributed to the formation of more phosphorus-rich structures retained in the char, thus reducing the release of harmful gases including NH 3 , CO, and CO 2 , and generating more incombustible gases including H 2 O to weaken burning intensity. Meanwhile, the satisfactory compatibility of PPy-Fe 2 O 3 with epoxy matrix imparts a superior mechanical strength to EP composites.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
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IF 5.6
Ni Wei,Xin Xu,Jiushun Qin,Wei Lai,Ruoyan Li,Chenhuan Lai,Qiang Yong
Development of green pretreatment strategies with excellent lignin removal ability is particularly important for masson pine biorefinery. γ-Valerolactone (GVL), as a green and recyclable solvent, has unique solvent characteristics to extract lignin. In this study, three acid catalysts, including sulfuric acid (H 2 SO 4 ), hydrochloric acid (HCl) and p -toluenesulfonic acid (TsOH), were used to catalyze γ-valerolactone (GVL) pretreatment of masson pine. Among them, the TsOH-catalyzed GVL pretreatment achieved the highest lignin removal ratio and the best cellulose enzymatic hydrolysis yield. Under the optimized pretreatment conditions (150 ℃, 150 mM TsOH, GVL/H 2 O (4:1, w/w), 1 h), the lignin removal ratio reached 89.0 %, achieving a 72 h glucose yield of 87.1 % from the pretreated residues. The solvent lignins from pretreatment liquid was separated and characterized by NMR analysis. Meanwhile, the hexoses in pretreatment liquid were further converted into levulinic acid (LA) using the TsOH-catalyzed bi-phase reaction systems. This study gives insights into developing a biorefining process for the effective utilization of masson pine.
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RADIATION PHYSICS AND CHEMISTRY
·
2024
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IF 2.8
Bingbing Qian,Yaodong Dai,Lingfei Xin,Chuqing Yao,Guohui Wang,Shuquan Chang
It is well known that the properties of polyethylene can be improved by irradiation-induced crosslinking the formation of three-dimensional network structures. This paper investigated the effects of gamma irradiation on the mechanical, thermal stability, and γ-rays shielding properties of TAIC-containing γ-rays shielding composites (HDPE/WC-PEW/TAIC). As a result, SEM images showed that agglomerations are alleviated after polyethylene wax (PEW) coated tungsten carbide (WC). The tensile strength and hardness increased from 25.39 MPa to 94 HA to 29.49 MPa and 98 HA after 50 kGy irradiation in vacuum as compared with all composites, while the thermal stability was also improved. The XPS and gel content results showed that the more crosslinked structures generated after 50 kGy irradiated in vacuum between high-density polyethylene (HDPE) and PEW, but irradiation in air is accompanied by the destruction of polymer skeleton. Moreover, the shielding rates of HDPE/WC-PEW/TAIC with thickness of 2 mm and containing 50 wt% WC can exceed 50% and 25% for 137 Cs and 60 Co sources respectively. In summary, HDPE/WC-PEW/TAIC could be an alternative to lead as γ-rays shielding material with excellent mechanical, thermal, and γ-rays shielding properties after 50 kGy irradiation in vacuum.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Yun Hu,Jingru Sun,Cuige Zhang,Chunmiao Xia,Liuyan Zhu,Maodong Xu,Rongli Zhang,Yinsheng Fang
Hollow carbon spheres (HCSs) have attracted broad attention in aqueous zinc-ion hybrid supercapacitors (ZIHSCs) owing to their distinctive properties. However, traditional methods for fabricating HCSs face limitations, including complex multistep procedures, the use of corrosive chemicals, and stringent reaction conditions. In this work, biomass-based poly(γ-glutamic acid)/Ni 2+ /melamine/chitosan nanoparticles were used as the precursors to fabricate N/O co-doped hollow graphite carbon spheres (HGCSs). Thanks to the appropriate hydrophilic characteristic, specific surface area, pore size distribution, and electrical conductivity, the fabricated HGCSs cathode exhibited superior electrochemical properties. The assembled HGCSs-based ZIHSCs device showed a satisfactory specific capacitance of 133.2 mAh·g −1 at a current density of 1.0 A·g −1 , high energy densities of 75.2 Wh·kg −1 at 10,000 W·kg −1 and 107.9 Wh·kg −1 at 1000 W·kg −1 , respectively. Additionally, the assembled HGCSs-based ZIHSCs device displayed an exceptional cycling stability, enduring up to 10,000 cycles at 0.5 A·g −1 with a capacity retention rate of 98.1 %. This work provides a facile and novel strategy to prepare superior electrochemical performance biomass-based HGCSs cathode for ZIHSCs.
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PubMed
高影响因子
Foods
·
2025
·Vol. 14
·期 7
·1206
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IF 5.1
Jingwen Li,Yujuan Hu,Qing Ma,Dongkun Zhao,Xinjing Dou,Baocheng Xu,Lili Liu
This study prepared palm stearin/linseed oil-based margarines (PST/LO-BMs) and palm stearin/linseed oil oleogel-based margarines (PST/LO-OBM) by incorporating varying proportions (20–60% oil phase) of linseed oil (LO) and LO-based oleogel, respectively. By comparing PST/LO-OBMs and PST/LO-BMs, it was found that the introduction of phytosterol–γ-oryzanol (PO) complexes and glycerol monostearate (GMS) to PST/LO-OBM induced three distinct crystalline morphologies: needle-like crystals, spherical crystals, and cluster-type crystals. These crystal assemblies synergistically constructed a robust three-dimensional network, effectively entrapping both aqueous droplets and liquid oil fractions while substantially reinforcing the structural integrity of PST/LO-OBM. Notably, the incorporated gelators modified the crystallization behavior, where GMS likely served as a nucleating site promoting triglyceride crystallization. This structural modulation yielded favorable β’-form crystal polymorphism, which is critically associated with enhanced textural properties. Comparative analysis with commercial margarine revealed that the PST45/LO40-OBM formulation exhibited comparable rheological performance, crystalline type, and thermal properties, while demonstrating superior nutritional characteristics, containing elevated levels of α-linolenic acid (23.54%), phytosterol (1410 mg/100 g), and γ-oryzanol (2110 mg/100 g). These findings provide fundamental insights for margarine alternatives with nutritional attributes.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Junying Wu,Ruijie Guo,Houting Kang,Yanming Wang,Jingyuan Tian,Jierong Wang,Hong Yan
Metal–organic frameworks (MOFs) have great potential in improving the fire safety of polymer materials. To improve the fire resistance and smoke suppression of polypropylene (PP), a flame-retardant system ZIF-67@γ-CD-MOFs@APP incorporating multiple flame-retardant elements was designed and applied to PP. The coated PP passed UL-94 V-0 level with the LOI up to 36.2% and char residue of 12.47%. The PHRR, PSPR, COP, and CO 2 P of coated PP were reduced by 52.65%, 24.72%, 36.49%, and 52.29%, respectively, compared to neat PP. In addition, the tPHRR, tPSPR, tCOP, and tCO 2 P were prolonged by 405.3%, 345.4%, 427.8%, and 405.3% compared to pure PP, allowing more escape time when facing a real fire. Integrating the hierarchical porous structure provided by ZIF-67 and γ-CD-MOFs, catalytic carbonization of transition metal Co and the nitrogen-containing ligand, ZIF-67@γ-CD-MOFs@APP played a flame-retardant role both in the condensed and gas phase, endowing PP with enhanced flame retardancy and smoke suppression. The “all-in-one” strategy provides helpful insights for constructing fire retardant system with multi-level nanostructure.
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Food and Bioprocess Technology
·
2025
·
IF 5.8
Yi Hongbo,Li Jun,Wang Peng,Wang Shengnan,Guo Xiaofei,Zhu Danshi,Liu He,Zhang Na
A high-salt diet is detrimental to human health, and applying γ -glutamyl peptides, known for their significant taste-enhancing properties, can offer a promising strategy for reducing salt intake while preserving saltiness. This study employed glutaminase-mediated transpeptidation of soy protein isolate hydrolysate to produce γ -glutamyl peptides, followed by identifying peptide sequences through LC–MS/MS analysis. γ -Glu-Gly-Pro-Phe and γ -Glu-Ala-Phe-Phe were selected for solid-phase synthesis and evaluated for their taste-enhancing effects. The results showed that both peptides could enhance saltiness, umami, and kokumi, with taste enhancement thresholds of 0.76 ± 0.22 and 0.58 ± 0.21 mmol L –1 , 0.43 ± 0.18 and 0.40 ± 0.21 mmol L –1 , and 0.25 ± 0.18 and 0.20 ± 0.21 mmol L –1 . Molecular docking and molecular dynamics simulation confirmed their stable binding with the calcium-sensing receptor (CaSR). Overall, γ -glutamyl peptides derived from soybean protein isolate exhibit taste-enhancing properties, making them potentially effective taste enhancers. Graphical
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高影响因子
Separations
·
2025
·Vol. 12
·期 11
·303
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IF 2.7
Ruiyi Sun,Fan Li,Yu Xie,Na Sui,Yong Li,Junlian Wang
In this study, two γ-carbon-substituted dialkylphosphinic acids—symmetrical di-(3,5,5-trimethylhexyl)phosphinic acid (P355) and unsymmetrical (2-ethylhexyl)(3,5,5-trimethylhexyl)phosphinic acid (P227-355)—were synthesized via a precise free radical addition method. Their chemical structures were fully characterized using ESI-HRMS,1H NMR,31P NMR, and FT-IR. Their middle REE extraction/separation performance, anti-emulsification behavior, and underlying mechanisms were investigated. Key results showed that P355 had better Dy saturation capacity (357.51 mg/L) and good selectivity for middle REEs (their average value ofβN + 1/N= 3.18), while P227-355 showed higher back-extraction efficiency (≈90% Dy stripping at ≥0.02 mol/L H2SO4). Methyln-pentyl ketone (MNPK) eliminated emulsification and boosted saturation capacity (324.18 mg/L Sm and 357.51 mg/L Dy for P355). Mechanistically, the extraction followed cation exchange (Sm3++ 2(HL)2↔ Sm·L3·(HL) + 3H+); MNPK formed hydrogen-bonded associates (HL·MNPK) with free extractants, slightly reducing the effective concentration of (HL)2but not altering the core cation exchange mechanism.
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American Journal of Translational Research
·
2019
·
IF 3.266
Zhongyue Huang,Huijie Gu,Xiaofan Yin,Long Gao,Kunxi Zhang,Yiming Zhang,Jun Xu,Liang Wu,Jingbo Yin,Lei Cui
Microspheres have gained immense popularity in bone tissue engineering because of their unique properties as injectable scaffolds for bone tissue regeneration. Herein, we evaluated the feasibility of using poly (γ-benzyl-L-glutamate) (PBLG) microspheres for bone engineering by examining the attachment, proliferation, and osteogenic differentiation of adipose-derived stem cells (ASCs) in vitro and the use of PBLG microspheres in healing non-union in vivo . Scanning electron microscopy and fluorescent 3, 30-dioctadecyloxacarbocyanine perchlorate-labeling were performed to study the attachment and growth of ASCs to the PBLG microspheres, and a DNA assay was performed to quantify cell proliferation with time. Osteogenic differentiation of ASCs cultured on the PBLG microspheres was assessed by determining alkaline phosphatase expression and extracellular calcium deposition, which was further confirmed by real-time polymerase chain reaction for osteogenesis-related genes. Femoral non-union were created in mouse models and filled with ASCs/PBLG microspheres in vivo . The results showed that ASCs attached, spread, and showed good osteogenic differentiation on the PBLG microspheres in vitro . Moreover, the ASCs/PBLG microspheres could repair the mouse femoral non-union in vivo . Thus, PBLG microspheres have good biocompatibility and cytocompatibility and are potentially useful as an injectable scaffolds for bone tissue engineering.
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