INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Na Li,Huan Xia,Shiyuan Liu,Junjiang Teng,Yanbin Jiang
In order to improve the activity and reusability of β-xylosidase, the β-xylosidase mutant S160N-R333H (R333H) which could convert notoginsenoside R1 to ginsenoside Rg1 and xylose was immobilized on the metal-organic framework (MOF) UiO-66-NH 2 . The physical and biochemical properties of immobilized β-xylosidase ( [email protected] 2 ) were studied in detail. The results showed improved performances, i.e. the high immobilization yield of 93% and recovery activity of 192.8%, better stability under acidic or trypsin-containing conditions, the higher activity in the reaction containing ions , and the improved catalytic efficiency (was 1.37-fold than that of free R333H). Importantly, the ginsenoside Rg1 yields remained more than 80% after six recycles in McIlvaine buffer and pure water. The UiO-66-NH 2 could catalyze xylose dehydration to produce furfural and the yield reached 69%. Thus this study provides a promising method for production of bioactive or platform chemicals via continuous conversion of xyloylated substrates using nanocatalyst synthesized by β-xylosidase and MOF.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yufeng Sun,Longhua Xu,Geoffrey I.N. Waterhouse,Minglin Wang,Xuguang Qiao,Zhixiang Xu
A novel three dimensional electrochemical sensor with signal amplification and selective recognition of sulfamerazine (SMR) was successfully constructed. First, highly conductive amino-functionalized carbon [email protected] organic frameworks (NH 2 [email protected] ) and molybdenum disulfide (MoS 2 ) nanosheets were employed to modify the glassy carbon electrode (GCE) by simple physical deposition, in order to enhance the SMR response signal. Then, molecularly imprinted polymer (MIP) membrane was anchored on the surface of this modified GCE by electrochemical polymerization to achieve selective recognition for SMR. The electrochemical performance of the assembled electrochemical sensor was systematically investigated with differential pulse voltammetry and cyclic voltammetry. This obtained sensor displayed excellent selectivity for SMR and good reproducibility. Under optimal conditions, the sensor offered a wide current response for SMR from 3.0 × 10 −7 to 2.0 × 10 −4 mol L −1 , with a limit of detection of 1.1 × 10 −7 mol L −1 . Furthermore, this developed sensor was successfully applied for the determination of SMR in pork and chicken samples with recoveries of 86.0%–102.0%, and results correlated well with those obtained by high-performance liquid chromatography.
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ACS Applied Nano Materials
·
2019
·
IF 0
Yi Feng,Qian Chen,Mengjue Cao,Nan Ling,Jianfeng Yao
Defect engineering and surface chemistry are closely related to the performance of materials. In this work, the effects of Zr precursors and Ti substitution on the photocatalytic performance of UiO-66-NH2 are studied and analyzed from the perspective of defect engineering and surface chemistry. The findings show that when using ZrOCl2·8H2O as the Zr precursor combined with the postsynthetic treatment of Ti substitution, sample U-OCl-Ti shows significant improvement in Cr(VI) adsorption (20.9 mg/g) and photocatalytic reduction of Cr(VI) under visible light. The improvement can be attributed to the highly defective framework and more -NH2 groups exposed on the surface; therefore the highest light absorption and lowest recombination rate of photogenerated electron–hole pairs are observed in U-OCl-Ti. The findings in this study contribute to a better understanding of how defects and surface chemistry affect the photocatalytic performance, thus providing some designing knowledge for the synthesis of UiO-66 or UiO-66-NH2 with high photocatalytic performance.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Kunxin Wang,Zhencai Qu,Hui Yang,Guoming Yuan,Xiu-e Li,Zhijun Liu,Yanhan Tao,Yang Li,Kun Wu,Jun Shi
Biobased carboxymethyl chitosan-modified black phosphorene (BP-CMC) was prepared through an amidation reaction between amino group functionalized black phosphorene (NH 2 -BP) and CMC. Density functional theory (DTF) express that the adsorption energy between urea and phosphene is −6.28 eV, indicating a strong interaction. The resulting BP-CMC was further applied to reinforce the mechanical, flame-retardant and thermal conductivity performance of honeycomb cellulose nanofiber (CNF) film via vacuum filtration. Cone calorimetry test (CCT) result exhibits that the introduction of 30 wt% BP-CMC significantly promoted the fire safety of CNF. For instance, a 98.41% reduction in smoke production rate (SPR), 92.00 % decline in CO release and a 61.31% decrease in heat release rate (HRR) were observed compared to neat CNF. Furthermore, Thermogravimetric infrared (TG-IR) indicates a significant decrease in the release of flammable gases. Raman spectra verify that the incorporation of 30 wt% BP-CMC improves the graphitization degree of residual chars, thus limiting the transfer of heat and oxygen. The improvement in fire safety is attributed to the formation of an intumescent flame-retardant system, which is rich in carbon source (CMC), acid source (BP) and gas source (amino). Simultaneously, the introduction of 30 wt% BP-CMC into CNF leads to considerable enhancement in thermal conductivity (up to 17.49 %), thermal diffusion (utmost to 43.45 %) and heat capacity (increased by 19.23 %). Moreover, the 30 wt % addition of BP-CMC into CNF possesses excellent mechanical properties with the improvement of toughness (increased by 143.50 %) and tensile strength (increased by 140.90 %). This strategy not only provides a new strategy for functionalizing BP but also upgrades the application potential of BP nanosheets in the fire safety of polymer composite films.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Syed Jalil Shah,Xinqi Luan,Xin Yu,Weige Su,Yucheng Wang,Zhongxing Zhao,Zhenxia Zhao
The development of metal organic framework (MOF)-based π-π conjugated structures capable of effectively transforming H 2 O from humid air to • OH radicals for VOCs photodegradation is a significant but difficult task. Herein, an amino-ionic liquid (NH 2 -IL) based dual-mode bridging strategy was proposed to connect 3D-graphene with NH 2 -MIL-125 forming IL-3DGr/NM(Ti) nanohybrids for advanced acetaldehyde photodegradation. The rational integration of these components was responsible for: (1) maintaining π-π conjugated electron transport system; (2) generating abundant coordinatively unsaturated sites and oxygen vacancies; (3) increasing surface area of the nanohybrids. With these attributes, IL-3DGr/NM(Ti) demonstrated enhanced charge separation and transportation electrochemical impedance spectroscopy (EIS): 7-times), acetaldehyde adsorption (22 %), light absorption (bandgap: 1.51 eV). The rapid H 2 O adsorption and photoconversion to • OH radicals by IL-3DGr/NM(Ti) enabled it to demonstrate superior CH 3 CHO photodegradation rate under high humidity, surpassing many state-of-the-art photocatalysts by 9 to 187 times under static air conditions and with nearly similar catalyst dosages* (photocatalyst weight and initial acetaldehyde concentration (mg ppm −1 ) ratio). Interestingly, the IL-3DGr/NM(Ti) photocatalytic activity was enhanced by increasing RH% up-to 80 %. Besides, the nanohybrids demonstrated tremendous stability, with only a 3.9 % decline observed after 5 consecutive-cycles. This strategy provides new prospects to improve the compatibility of graphene/MOF materials for futuristic photoelectrical applications under high humidity.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Ruixue Yan,Hao Guo,Zeyun Yang,Wenting Niu,Jianpeng Ma,Liping Peng,Mingyue Wang,Wu Yang
Alterations in guanine (GA) and adenine (AE) levels within the human body are intricately linked to overall health and daily physiological functions. Therefore, it is crucial to develop an accurate and sensitive sensor for quantifying the levels of GA and AE. In this present paper, a novel electrochemical sensor NH 2 -MXene@COF TA-DH /GCE was constructed by in-situ growing COF TA-DH with high crystallinity, good thermal stability and N-rich active centers based on Schiff base condensation reaction of 1, 3, 5-tris-(4-aminophenyl) triazine (TAPT) and 2,5-dihydroxyl-terephthalaldehyde (DHTA) on highly conductive NH 2 -MXene and then modifying it on the surface of the glass carbon electrode (GCE). The highly dispersed sandwich structure of NH 2 -MXene@COF TA-DH significantly increases the specific surface area and exposes a greater number of active sites. Benefitted from remarkable synergistic effect, the sensor exhibited excellent electrochemical catalytic activity and high sensitivity for GA and AE detection. The sensing platform was successfully used for simultaneous detection of GA and AE with wide linear ranges of 0.6–230 μM and 1–450 μM and low detection limits of 0.07 μM and 0.44 μM, respectively. This study expands applications of COFs and MXene in electrochemical biosensing platform and provides a general and valuable strategy for COFs-based electrochemical sensor construction for biomedical investigations
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2016
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IF 7.476
Weiwei Hu,Quansheng Chen,Huanhuan Li,Qin Ouyang,Jiewen Zhao
Rare earth-doped upconversion nanoparticles have promising potential in the field of pesticide detection because of their unique frequency upconverting capability and high detection sensitivity. This paper reports a novel aptamer-based nanosensor for acetamiprid detection using fluorescence resonance energy transfer (FRET) between NH 2 -NaYF 4 : Yb, [email protected] 2 (UCNPs) and gold nanoparticles (GNPs). Herein, GNPs as acceptors efficiently quench the fluorescence of UCNPs and acetamiprid specifically interacts with acetamiprid binding aptamer (ABA), causing the conformation changes of ABA from random coil to hairpin structure. Accordingly, ABA no longer stabilizes the GNPs in salt solution, leading to the varying aggregation extent of GNPs. Thus, the fluorescence of UCNPs are proportionally recovered. Under the optimized conditions, the enhancement efficiency was observed to increase linearly with the concentration of acetamiprid from 50 nM to 1000 nM, resulting in a relatively low limit of 3.2 nM. Additionally, the aptasensor demonstrated high selectivity to similar structure pesticides such as imidacloprid and chlorpyrifos , and further confirmed its application capacity in adulterated tea samples.
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2014
·
IF 6.451
Liuliu Gao,Junlin He,Wailan Xu,Jing Zhang,Junmin Hui,Yanlei Guo,Wenjuan Li,Chao Yu
α2,6-Sialylated glycans are crucial molecular targets for cancer diagnosis and clinical research. In this work, a novel ultrasensitive electrochemical biosensor was fabricated based on a graphite oxide (GO), Prussian blue (PB), and PTC-NH 2 (an ammonolysis product of 3,4,9,10-perylenetetracarboxylic dianhydride) nanocomposite for the selective detection of α2,6-sialylated glycans. To increase the sensitivity of the electrochemical biosensor, gold nanoparticles (GNPs) were immobilized on a GO–PB–PTC-NH 2 modified glassy carbon electrode (GCE). Sambucus nigra agglutinins (SNAs), which specifically bind with α2,6-sialylated glycans, were covalently immobilized on GNPs for the sensitive detection of α2,6-sialylated glycans in serum. This proposed method can be applied to human serum, and it worked well over a broad linear range (0.1 pg mL −1 –500 ng mL −1 ) with detection limits of 0.03 pg mL −1 . Moreover, recovery of the spiked samples ranged from 100.2% to 105.0%, suggesting that this excellent electrochemical biosensor can be used for the practical detection of α2,6-sialylated glycans.
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PubMed
高影响因子
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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REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Yipeng Zhang,Yani Wang,Kewei Wang,Xiaopeng Xiong
The persistent presence of antibiotic contaminants, such as fluoroquinolones (FQs), in aquatic environments poses significant environmental risks. In this study, a porous poly(glycidyl methacrylate) (PPGMA) microsphere adsorbent was designed for the efficient removal of FQs. Acrylate monomers were dispersed in water to prepare an oil-in-water high internal phase emulsion, which was subsequently subjected to ultraviolet (UV) irradiation for 3 min to prepare the microsphere with high yield. To template the porous structure, cyclohexane, a poor solvent for the polymer, was introduced into the initial monomer oil phase, and its influence on the evolution of porous morphology was systematically investigated. Thereafter, the porous microsphere was modified through grafting with polyethyleneimine to facilitate the in-situ growth of a metal-organic framework, UiO-66-NH 2 . The modification progress was monitored, and the final UiO@PPGMA microspheres were comprehensively characterized. Based on adsorption kinetics and thermodynamics, the microsphere containing only 2.78 % UiO-66-NH 2 exhibits significantly enhanced adsorption rate and capacity, which can be attributed to the in-situ grown UiO-66-NH 2 nanoparticles. Furthermore, the UiO@PPGMA microsphere can be easily regenerated, allowing it to be packed in a column for cyclic fixed-bed adsorption. Consequently, our results demonstrate a facile strategy for preparing porous microsphere adsorbents, which may have promising applications in the removal of antibiotic contaminants from water sources.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 37
·25465-25474
·
IF 10.7
Yalin Niu,Peng Jiang,Tianying Guo
Developing high-performance artificial enzyme materials with practical applications in efficient catalytic hydrolysis detoxification of organophosphate (OP) nerve agents remains a formidable challenge. Herein, UiO-66-NH2-stabilized Pickering high internal phase molecularly imprinted polymer systems (MOFs@PHIPMIPs) were developed using OPs as template molecules. Thus, UiO-66-NH2-doped high-internal-phase MIP composites were obtained, which integrate MIPs and MOFs successfully, showing remarkable catalytic hydrolysis activity towards OPs. In addition, by introducing methyl methacrylate (MMA) during copolymerization, the MOFs@PHIPMIPs would effectively acquire pH buffering properties. The multi-porous composite catalysis system exhibits an exceptionally high detoxification efficiency towards dimethyl-4-nitrophenyl phosphate (DMNP) in pure water (kobs = 0.9162 min−1, t1/2 = 0.76 min). This work presents a new strategy for the preparation of artificial phosphatase materials with high-performance catalytic detoxification of OPs with great application prospects.
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高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Kuirong Feng,Lingxin Meng,Jingmei Xu,Pengyun Zhao,Na Li,Jinxuan Lei
In this paper, UiO-66-NH2 was successfully modified with a phosphate group by a Schiff base reaction. The phosphate and amine bifunctionalized UiO-66-NH2 (PUIN) was successfully prepared. A series of composite membranes were prepared by adding PUIN fillers to sulfonated poly(aryl ether ketone sulfone) (FSPUIN-X) containing fluorene groups. The introduction of PUIN containing both phosphate and amino bifunctional groups increased the number of proton transport sites within the membrane and facilitated the construction of continuous proton transport channels. The addition of PUIN resulted in a significant increase in the proton conductivity of FSPUIN-X due to the introduction of more proton transport sites. The conductivity of FSPUIN-5 (174.22 mS cm–1) was 1.46 times higher than that of pure membranes (119.32 mS cm–1) at the same condition. And the open-circuit voltage and power density of FSPUIN-5 also reached 0.957 V and 0.54 W cm–2, respectively. The structure and morphology of PUIN and membranes were characterized by Fourier infrared (FT-IR), X-ray polycrystalline diffraction (XRD), nuclear magnetic resonance hydrogen spectrum (1H NMR), and scanning electron microscopy (SEM). Meanwhile, the PUIN also strengthened the mechanical properties of FSPUIN-X series membranes. All of the results indicated that the introduction of phosphate and amine bifunctionalized UiO-66-NH2 promoted the comprehensive performance of the composite membranes.
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