CATALYSIS LETTERS
·
2024
·
IF 2.3
Shen Nan,Hua Shaofeng
A dual-enzyme cascade catalytic system (Cu-rGO-Fe 3 O 4 -GA-CEL-PEI-GOD) was prepared by co-immobilizing cellulase (CEL) and glucose oxidase (GOD) on a nanocomposite (Cu-rGO-Fe 3 O 4 ) to efficiently catalyze the conversion of carboxymethyl cellulose (CMC) to gluconic acid. A layer-by-layer strategy was used by adding polyethyleneimine (PEI) to allow the upper enzyme layer to attach to the lower neighboring layer, increasing the loading capacity of the support. The loading capability of CEL and GOD on Cu-rGO-Fe 3 O 4 -GA-CEL-PEI-GOD were 55.034 mg g −1 and 12.4 mg g −1 , respectively. The specific activity of CEL on Cu-rGO-Fe 3 O 4 -GA-CEL was 74.3 U·g −1 , and that of immobilized CEL after cross-linking PEI was 25.45 U·g −1 , which could retain 34.253% of the enzyme activity. The specific activity of GOD on Cu-rGO-Fe 3 O 4 -GA-CEL-PEI-GOD was 30.9 U·g −1 . The carrier Cu-rGO-Fe 3 O 4 has peroxidase-like activity, which can timely remove harmful H 2 O 2 to the enzyme, thereby improving the yield of gluconic acid and the stability of biocatalysts. The yield of gluconic acid with Cu-rGO-Fe 3 O 4 -GA-CEL-PEI-GOD reached 96.04% within 2 h, higher than the control systems for comparison. In addition, the Cu-rGO-Fe 3 O 4 -GA-CEL-PEI-GOD maintained 82.61% of catalytic activity even after undergoing seven cycles of reaction. The dual-enzyme catalytic systems had shallow temperature and pH optima of 40 °C and 4.5. Such a chemoenzymatic cascade system provides a new strategy for the conversion from CMC to gluconic acid in one-step. Graphical Abstract Enzymatic conversion of sodium carboxymethyl cellulose (CMC-Na) to gluconic acid.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 25
·1-14
·
IF 2.8
Qian Wanqing,Xu Qingliang,Yu Xueqing,Hussain Fayaz,Chen Xinhua,Su Weitao,Sun Shikuan,Song Kaixin
To develop new luminescent materials for optical thermometers, a series of Er 3+ /Eu 3+ doped double perovskite La 2 MgSnO 6 phosphors are synthesized by a high-temperature solid-phase method. The structure, luminescence performance, energy transfer, and thermal sensitivity are systematically studied by X-ray diffraction (XRD), scanning electron microscopy fluorescence spectroscopy, lifetime decay curve, and temperature-dependent emission spectra. The prepared samples possess good coincidence with pure perovskite phase, and the refined high-quality XRD data reveal that Eu 3+ and Er 3+ jointly occupy La 3+ sites. which is attributed to the effective energy transfer from Er 3+ to Eu 3+ ions. By adjusting the doping concentration of Eu 3+ , the emission of Er 3+ is attenuated and the luminous color is modulated from green to orange-red. These demonstrate the existence of energy transfer between Er 3+ and Eu 3+ . In addition, the optimized La 2 MgSnO 6 : 0.075Er 3+ , 0.04Eu 3+ phosphor exhibits excellent thermal stability and good temperature cycling. The emission intensity showed good cycling in the process of repeated heating and cooling, and maintained to 76% of the initial temperature (303K) at 403K. Studied the optical temperature sensing performance of LMS: 0.075Er 3+ , 0.04Eu 3+ fluorescent powder. The results of fitting the fluorescence intensity ratio with the non-thermal coupling characteristic peaks of 555 and 706nm showed excellent optical sensitivity, and the S a and S r were calculated as 0.0029K −1 and 1.21%K −1 , respectively. All results indicate that LMS: 0.075Er 3+ , 0.04Eu 3+ phosphors could have potential applications for non-contact optical temperature measurement materials.
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Small Methods
·
2025
·
IF 9.1
Jinrui Li,Huiyan Xie,Di Sun,Hongguang Li,Xia Xin
Exploring potential third-order nonlinear optical (NLO) materials attracts ever-increasing attention. Given that the atomically precise and rich adjustable structural features of silver nanoclusters (Ag NCs), as well as the unique π-electron conjugated system of carbon-based nanomaterials, a supramolecular co-assembly amplification strategy to enhance the luminescent intensity and NLO performance of the hybrids of the two components, are constructed and the relationship between structures and optical properties are investigated. By combining water soluble Ag NCs [(NH 4 ) 6 [Ag 6 (mna) 6 ] (H 2 mna = 2-mercaptonicotinic acid, abbreviated to Ag 6 ─NCs hereafter) containing uncoordinated carboxyl groups with water-soluble fullerene derivatives modified with multiple hydroxyl groups (fullerenols, C 60 ─OH), the π-electron delocalization is expanded owing to non-covalent hydrogen bonding effect between Ag6─NCs and C 60 ─OH, which provides a feasible basis for realizing the NLO response. Then, the co-assemblies are doped into a PMMA matrix to prepare composite film and its NLO properties are evaluated by Z-scan technique. Remarkably, the effective nonlinear absorption coefficients β is of two orders magnitude higher than those of the Ag 6 ─NCs assemblies at the absence of C 60 ─OH. This work showcases a new approach for amplifying NLO responses which greatly facilitates the development of integrated photonic devices.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Wen Liu,Furong Ye,Yahao Zhao,Peng Liu,Changcun Han,Meng-Dai Luoshan,Jiayi Tian,Zhengwang Cheng,Yizhong Huang
In the quest for effective photocatalysts for hydrogen production via photocatalytic water splitting, ZnIn 2 S 4 has garnered considerable attention due to its high photocatalytic hydrogen evolution capability. In this study, boron-doped ZnIn 2 S 4 was successfully synthesized via a hydrothermal method , with a small amount of cobalt phosphate (Co-Pi) decorated on its surface. The hydrogen evolution rate of boron-doped ZnIn 2 S 4 was determined to be 5.2 mmol g −1 h −1 , surpassing that of pure ZnIn 2 S 4 by 1.68 times. Moreover, with the addition of Co-Pi to boron-doped ZnIn 2 S 4 , the hydrogen production rate escalated to 29.7 mmol g −1 h −1 , which is 9.58 times higher compared to pure ZnIn 2 S 4 . UV–vis analysis revealed that boron doping introduced new energy levels into ZnIn 2 S 4 , effectively narrowing the bandgap and enhancing light absorption wavelength range. Furthermore, PL and XPS analyses indicate that Co-Pi effectively captures photogenerated holes (h + ) in ZnIn 2 S 4 , retaining photogenerated electrons and overcoming the disadvantage of electron-hole pair recombination in ZnIn 2 S 4 . The doping and loading of Co-Pi as a cocatalyst ultimately contribute to enhancing hydrogen production efficiency, thereby significantly improving the photocatalytic hydrogen evolution capability of ZnIn 2 S 4 . This study provides a scalable idea for designing composite catalysts in which doping and co-catalysts work together.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2025
·
IF 4.9
Feifei Wang,Dianlong Jia,Qingcui Song,Xiaomeng Lu,Guozi Xia,Jun Li,Xiaodong Jia,Mingliang Gu,Fengjiao Yuan,Zhengping Wang,Zhangyong Xia
Resistance against tumor necrosis factor-related apoptosis-inducing ligand (TRAIL)-induced cell death of cancer cells is a major obstacle in clinical application of TRAIL. Bortezomib (BTZ) is the first-generation proteasome inhibitor to enhance TRAIL-mediated apoptosis and overcome tumor cell resistance to TRAIL, therefore we developed a novel nanodrug called LSBTZ-TRAIL to co-deliver TRAIL and BTZ via liposomes. TRAIL was coupled to the surface of the liposome by DSPE-PEG 2000 -NHS, while BTZ was encapsulated in the internal aqueous phase. LSBTZ-TRAIL was characterized with a particle size of 147.00 ± 1.300 nm, polydispersity index (PDI) of 0.056 ± 0.005 and zeta potential of -8.17 ± 0.600 mV. LSBTZ-TRAIL did not change the secondary structure of TRAIL, and LSBTZ-TRAIL was stable in 50% fetal bovine serum and tumor microenvironment. In vitro, the cell killing capacity of LSBTZ-TRAIL was 1.16-6.22 times that of TRAIL + BTZ. Mechanistically, LSBTZ-TRAIL induced apoptosis of tumor cells by up-regulating the death receptor (DR4/5) and activating the caspase signaling pathway. In vivo and in vitro uptake experiments, LS-TRAIL accumulated more in tumor cells or tissues than LS. In vivo , the antitumor effect of LSBTZ-TRAIL was 2.62 times that of TRAIL + BTZ, and prolonged the survival and blood circulation time of mice. In addition, safety evaluation showed that LSBTZ-TRAIL had no acute toxic effects in vivo . These results suggested that the liposomal co-delivery system of TRAIL and BTZ significantly enhance their antitumor effects and provide a new approach to overcome TRAIL-resistance.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Zhiyi Liao,Jiayi Li,Wenqiang Ni,Rixing Zhan,Xisheng Xu
Altered skin integrity increases the chance of infection, and bacterial infections often lead to a persistent inflammatory response that prolongs healing time. Functional artificial hydrogels are receiving increasing attention as suitable wound dressing barrier. However, the antimicrobial effect of the new dressing still needs to be explored in depth. In this work, the antimicrobial peptide MSI-1 was covalently attached to chitosan-modified poly (vinyl alcohol) hydrogels mixed with Prussian blue nanoparticles (PBNPs) via a primary amine group coupled to a carboxyl group. The synthesized hydrogel has a long-lasting antimicrobial surface and is able to maintain its bactericidal effect on Staphylococcus aureus and Escherichia coli for 24 h. Due to the presence of PBNPs, the hydrogel was able to rise to 48.3 °C within 10 min under near infrared (NIR) light irradiation at a wavelength of 808 nm and maintain this mild temperature to avoid bacterial biofilms. The hydrogel showed >90 % survival in co-culture with cells for 3 d and did not damage major organs in animal experiments. Thus, the photothermal dual-mode antimicrobial hydrogel synthesized in this study increases the selectivity as a safe and efficient wound dressing for the treatment of infected skin defects.
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Soft Matter
·
2012
·Vol. 8
·期 13
·3665-3672
·
IF 4.39
Dong Ma,Hong-Bin Zhang,Kai Tu,Li-Ming Zhang
Novel supramolecular hydrogel/micelle composites were designed for the co-encapsulation and prolonged release of camptothecin (CPT) and granulocyte colony-stimulating factor (G-CSF). For this purpose, heparin-conjugated Pluronic F-127 (Hep-F-127) was synthesized by a click reaction and then used to self-assemble the micelles with their hydrophobic cores loaded with CPT and hydrophilic shells complexed with G-CSF. By mixing α-cyclodextrin (α-CD) and CPT-loaded Hep-F-127 micelle/G-CSF complexes in an aqueous system, the supramolecular hydrogel/micelle composite with good injectability could be formed under mild conditions. For the co-encapsulated CPT and G-CSF, they could maintain their biological activity and exhibit a more prolonged release when compared to CPT-loaded Hep-F-127 micelles/G-CSF complexes. Moreover, the gelation properties and drug release profiles could by tuned by α-CD amount.
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ADVANCED MATERIALS
·
2024
·
IF 27.4
Yan Wang,Ting Ou,Yue Dong,Lu Chen,Yunjie Huang,Delong Sun,Wei Qiang,Xiaopeng Pei,Yiju Li,Ying Tan
Hybridizing aqueous electrolytes with organic co-solvents can effectively expand the voltage window of aqueous electrolytes while reducing salt usage, but most reported co-solvents are usually flammable and toxic, hardly achieving compatibility between safety and electrochemical performance. Here, a new non-flammable and non-toxic low-salt-concentration (1.85 m) aqueous electrolyte is reported using the green co-solvent isosorbide dimethyl ether (IDE). Owing to its unique 3D molecular structure, IDE can form a five-membered ring structure by binding the Li ion. The steric hindrance effect from IDE weakens its solvation ability, generating anion-participated solvation structures that produce a robust and uniform LiF-rich solid electrolyte interphase layer while containing elastic IDE-derived organics. Moreover, the multiple O atoms in IDE can effectively regulate the intermolecular hydrogen bonding networks, reducing H 2 O molecule activity and expanding the electrochemical window. Such unique solvation structures and optimized hydrogen bonding networks enabled by IDE effectively suppress electrode/electrolyte interfacial side reactions, achieving a 4.3 V voltage window. The as-developed Li 4 Ti 5 O 12 (LTO)||LiMn 2 O 4 (LMO) full cell delivers outstanding cycling performance over 450 cycles at 2 C. The proposed green hybrid aqueous electrolyte provides a new pathway for developing high-voltage aqueous lithium batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zan Zhang,Meng Zhang,Gaojie Yan,Mengke Li,Haifeng Ji,Yi Feng,Xiongwei Qu,Xiuli Hu,Xiaojie Zhang
The performance of Li-S batteries based on multiphase and multi-electron transfer mechanisms is highly dependent on the redox kinetics of sulfur. However, the slow redox kinetics of the endogenous redox mediator lithium polysulfides hinders the preparation of high-performance Li-S batteries. In this work, two functional polyurea binders (PUSe and PUS) were synthesized, which possess diselenide or disulfide modules. PUSe and PUS binders can not only limit the shuttling effect of polysulfides by abundant urea groups effectively, but also give the sulfur cathode excellent mechanical properties by introducing intermolecular hydrogen-bonding networks and diselenide and disulfide modules. More significantly, selenium-selenium and sulfur-sulfur modules have been considered as redox co-mediators to accelerate the redox process of sulfur cathode. Li-S batteries involved with PUSe and PUS as binders show excellent electrochemical performance, while significantly accelerating the redox kinetic process, the initial discharge specific capacity of the cell with PUSe as binder was as high as 963.1 mAh/g and 856.7 mAh/g after 500 cycles at 1C; the capacity decay rate is only 0.022% per cycle.
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Nanoscale
·
2015
·Vol. 7
·期 28
·11956-11961
·
IF 7.394
Wenxiu Yang,Xiaoyu Yue,Xiangjian Liu,Junfeng Zhai,Jianbo Jia
A highly efficient N, S co-doped porous carbon ORR catalyst was simply designed in our report from ordered mesoporous carbon (OMC) and trace ionic liquids (ILs). The microstructure OMC was chosen as the template for improving the specific area, confining the ILs in the mesopores, and promoting the formation of the planar N and S doping. The resulting IL/OMC (IOMC) nanostructure exhibits comparable ORR activity and better stability than the commercial Pt/C catalyst in 0.10 M KOH solution, which makes it one of the best-performing metal-free carbon ORR catalysts. We deduced that the excellent ORR activity is attributed to the synergistic effect of N, S, and the ordered mesoporous structure. Interestingly, the ORR activity can be further boosted in both basic and acidic solutions after Fe doping into the IOMC nanostructures which clearly emphasizes that transition metal Fe is important for the construction of ORR active functional sites especially in acidic solution.
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RSC Advances
·
2015
·Vol. 5
·期 104
·85640-85645
·
IF 3.84
Benxia Li,Xiankun Shao,Yonggan Hao,Yan Zhao
Transition metal oxides with hollow or mesoporous microstructures represent a unique class of heterogeneous catalysts or catalyst supports with many fascinating features such as the large surface areas, tunable pore sizes and volumes, multitude of compositions, and ease of functionalization. In this work, we demonstrated a general ultrasonic-spray-assisted synthesis of various transition metal oxide hollow/mesoporous microspheres, using only low-cost commercial metal chlorides as precursors and water as solvent. As typical examples, five mono-component metal oxides (CeO2, α-Fe2O3, Co3O4, SnO2 and TiO2) hollow or mesoporous microspheres were prepared and their formation mechanisms were discussed. The catalytic carbon monoxide (CO) oxidation indicated that these metal oxide products exhibited improved catalytic activities than some of those reported previously, due to their tiny crystalline grains, large pore volume and specific surface area. The universality of this synthetic method was also demonstrated in producing multi-component and multi-functional metal oxides with hollow/mesoporous structures. This work therefore provides an industrial level producing method for the scalable preparation of various metal oxide hollow/mesoporous microspheres which are expected to be used as high-performance catalysts or catalyst supports in more chemical reactions.
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SOLAR ENERGY
·
2015
·
IF 3.469
Haoran Yan,Jianxin Wang,Bo Feng,Ke Duan,Jie Weng
In the present work, a novel multistage structure dye-sensitized solar cell (DSSC), which consists of Ag nanowires (AgNWs), TiO 2 nanoparticles and graphene wrapped TiO 2 mesoporous microspheres (GTMs), was fabricated by using simple spin coating steps. The aim of this study was to modify the bandgap of GTMs by using graphene so as to promote the light absorption of GTMs in the visible light region and in turn to improve the power conversion efficiency (PCE) of DSSCs. Additionally, graphene and AgNWs can enhance the electron transfer in the DSSC to further improve the PCE of DSSCs. The effect of AgNWs and GTMs light scatting layer on the photovoltaic performance of DSSCs was investigated. The results showed that a PCE of 7.42% was achieved for the DSSC co-modified by GTMs and AgNWs, which was about twice as much as that for the DSSCs only with a TiO 2 nanoparticle layer (with a PCE of 3.53%). This present study might open a new avenue for the improvement of the PCE of DSSCs.
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