CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Hongli Wu,Ting Huang,Fei Cao,Qiaogen Zou,Ping Wei,Pingkai Ouyang
Co-production of multi-products is one of the core principles of chemical industry, and it is also an important way to improve the atom economy. Herein, we proposed an approach to co-producing two valuable platform compounds, gluconic acid (GA) and 5-hydroxymethyl furfural (HMF), from sucrose by successive hydrolysis, oxidation and dehydration. In the enzymatic oxidation step, only glucose was oxidized to GA, meanwhile fructose was 100% retained. In the further biphasic dehydration system, only fructose was converted into HMF, whereas GA was maintained with over 95% recovery. After three reactions, the yields of HMF and GA were respectively 42.5% and 48% when the initial feedstock of sucrose was 200 g/L. Two products were easily separated because GA was completely existed in aqueous phase, and HMF was mainly in organic phase. In the whole process, only commercial enzymes and mineral acid were used instead of self-made catalysts.
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JOURNAL OF POWER SOURCES
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2017
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IF 6.395
Chao Yang,Shu Yu,Yu Ma,Chunfu Lin,Zhihao Xu,Hua Zhao,Shunqing Wu,Peng Zheng,Zi-Zhong Zhu,Jianbao Li,Ning Wang
Ti 2 Nb 10 O 29 is an advanced anode material for lithium-ion batteries due to its large specific capacity and high safety. However, its poor electronic/ionic conductivity significantly limits its rate capability. To tackle this issue, a Cr 3+ –Nb 5+ co-doping is employed, and a series of Cr x Ti 2–2 x Nb 10+ x O 29 compounds are prepared. The co-doping does not change the Wadsley–Roth shear structure but increases the unit-cell volume and decreases the particle size. Due to the increased unit-cell volumes, the co-doped samples show increased Li + -ion diffusion coefficients . Experimental data and first-principle calculations reveal significantly increased electronic conductivities arising from the formation of impurity bands after the co-doping. The improvements of the electronic/ionic conductivities and the smaller particle sizes in the co-doped samples significantly contribute to improving their electrochemical properties . During the first cycle at 0.1 C, the optimized Cr 0.6 Ti 0.8 Nb 10.6 O 29 sample delivers a large reversible capacity of 322 mAh g −1 with a large first-cycle Coulombic efficiency of 94.7%. At 10 C, it retains a large capacity of 206 mAh g −1 , while that of Ti 2 Nb 10 O 29 is only 80 mAh g −1 . Furthermore, Cr 0.6 Ti 0.8 Nb 10.6 O 29 shows high cyclic stability as demonstrated in over 500 cycles at 10 C with tiny capacity loss of only 0.01% per cycle.
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RSC Advances
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2016
·Vol. 6
·期 83
·79268-79274
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IF 3.289
Shuo Shi,Qing-Yun Wu,Lin Gu,Kunyu Zhang,Haibin Yu
The present work reports novel bio-based, amorphous, biodegradable and biocompatible polymer networks which were synthesized from polylactide (PLA)-based tetraols and hexamethylene diisocyanate trimer. These bio-based polymer networks exhibit a glass transition temperature (Tg) in the range of 13.4–32.9 °C, which can be adjusted between room temperature and body temperature by variation of the molecular weight of macrotetrols and incorporation of caprolactone (CL) units. Tensile strength and elongation of the resulting polymer networks could be tuned in a wide range from 14 MPa to 43 MPa and 10% to 176%, respectively. A series of shape memory tests indicate that the obtained polymer networks show excellent shape memory behavior at body temperature with a shape recovery rate higher than 90%. Alamar blue assay was used to evaluate the potential biocompatibility of the synthesized polymer networks, and the results demonstrated that all the obtained networks had no cytotoxicity, making them suitable for biomedical applications.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
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2016
·Vol. 47
·期 3
·361-367
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IF 2.223
Xiao Mingshu,Zhang Zhonghui,Tian Yanping,Miao Yuqing,Wang Jiahai
Abstract In this work, the synthesis of Co–Fe–Se ultrathin nanosheet-fabricated microspheres was reported for the first time as electrocatalysts toward hydrogen evolution reaction (HER). The Co–Fe–Se ternary compounds exhibited high electrocatalytic activity of HER with low onset potential in acid media due to the high specific surface area of Co–Fe–Se ultrathin nanosheet-fabricated microspheres. The presence of multiwall carbon nanotubes improved the immobilization effect of Co–Fe–Se catalysts and electron transfer between catalysts and electrode surface, leading to the improved stability and HER electrocatalysis. The non-noble metal-based ternary compounds of Co–Fe–Se obtained from earth-abundant elements may enlighten a new way of exploring cost-effective catalysts for HER to develop hydrogen energy. Graphical Abstract
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Journal of Applied Biomaterials & Functional Materials
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2016
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IF 0.934
Junyan Yao,Shijie Zhang,Wudan Li,Yujie Li
BackgroundThe amorphous poly(lactic acid-co-lysine) (PLL) with hydrophilic reactive groups was synthesized by the condensing copolymerization and the blending miscibility of poly(L-lactic acid) (PLLA) and PLL was investigated.MethodsThe miscibility of PLLA and PLL was evaluated by analyzing the thermal properties, crystallization behaviors, crystal morphologies and mechanical properties of the PLLA/PLL blends.ResultsThe results indicated that amorphous PLL changed the crystallization behaviors and thermal properties of PLLA, decreasing the crystallinity of PLLA in the blends. The amorphous PLL molecule chains in PLLA/PLL blends were able to enter into the lamellars of PLLA spherulites and affect the crystallization behaviors of PLLA, resulting in imperfect, spherulite structures of PLLA. The formation of hydrogen bonds between PLLA molecular chains and PLL molecular chains enabled partial compatibility in this blend system.ConclusionsThe existence of PLL improved the hydrophility of PLLA/PLL blends, led to a higher content of PLL in the PLLA/PLL blend system, and better hydrophilic properties of the blend system. The PLL was partially miscible with the PLLA, and the PLLA/PLL blend with 10 wt% PLL had improved tensile properties.
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RSC Advances
·
2016
·Vol. 6
·期 107
·105442-105448
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IF 3.289
Yue Cao,Yan Li,Yin Wu,Wenliang Li,Chunlei Yu,Yanxin Huang,Luguo Sun,Yongli Bao,Yuxin Li
Co-Encapsulated angiostatin (AS) and curcumin (Cur) in poly(ethylene glycol)-b-poly(ε-caprolactone) polymersomes (PEG–PCL-PMs) were prepared by film hydration method. The size and zeta potential of the prepared PEG–PCL-PMs were about 153 nm and −0.22 mV, respectively. Transmission electron microscopy was employed to confirm the polymersomal structure of PEG–PCL-PMs. In vitro drug release profiles showed a sustained release of angiostatin and curcumin from the dual-drug loaded polymersomes under physiological conditions (pH 7.4). In addition, confocal laser scanning microscopy and flow cytometry showed that drug-loaded polymersomes were delivered efficiently into the cytoplasm and nuclei of human microvascular endothelial cell line (HMEC-1) and then released active drugs in cells. Dual drug-loaded polymersomes (AS–Cur-PMs) remarkably inhibited proliferation and migration of HMEC-1 cells compared to those treated with the single drug. The chick chorioallantoic membrane assay showed that AS–Cur-PMs inhibited vessel sprouting in the chicken chorioallantoic membrane. Our data demonstrates a synergistic effect of angiostatin and curcumin in inhibiting angiogenesis, both in vitro and in vivo.
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BIOMACROMOLECULES
·
2025
·
IF 5.4
Dan Li,Youbing Li,Yu Zhang,Yunsheng Xu,Xianming Zhang,Minna Hakkarainen
Production of high-performance polyesters with tailored degradability remains a challenge. Here, a series of poly(ethylene-co-isosorbide terephthalate) (PEIT) copolyesters were synthesized by varying the isosorbide (IS) content (0–20 mol %) using tetrabutyl titanate (TBT) as the catalyst. By variation of the IS content, the thermal, mechanical, and optical properties of the copolyesters were effectively tailored. As the IS content increased, the Tg was raised from 80 to 101 °C, and the tensile strength from 58.8 to 68.7 MPa. Moreover, excellent transparency was maintained (up to 90% light transmittance). Interestingly, the susceptibility to hydrolytic degradation was significantly enhanced by the incorporation of IS, with PEIT-20 showing approximately 3.5 times higher weight loss compared to PET after 50 days of alkaline degradation in 0.1 M NaOH solution. This outlines an attractive approach for developing high-performance copolyesters with tunable properties and degradation rates, suitable for applications in transparent thermal packaging materials.
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Advanced Science
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2025
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IF 14.1
Fengyi Zhong,Jianping Sheng,Chenyu Du,Ye He,Fengying Zhang,Yanjuan Sun,Ying Zhou,Fan Dong
Heterojunctions, known for their decent separation of photo-generated electrons and holes, are promising for photocatalytic CO 2 reduction. However, a significant obstacle in traditional post-assembled heterojunctions is the high interfacial barrier for charge transfer caused by atomic lattice mismatch at multiphase interfaces. Here, as research prototypes, the study creates a lattice-matched co-atomic interface within CsPbBr 3 -CsPb 2 Br 5 polytypic nanocrystals (113-125 PNs) through the proposed in situ hybrid strategy to elucidate the underlying charge transfer mechanism within this unique interface. Compared to CsPbBr 3 nanocrystals, the 113–125 PNs exhibit a remarkable 3.6-fold increase in photocatalytic CO 2 reduction activity (173.3 µmol −1 g −1 within 5 h). Furthermore, Kelvin probe force microscopy results reveal an increase in the built-in electric field within this lattice-matched co-atomic interface from 43.5 to 68.7 mV, providing a stronger driving force for charge separation and directional migration. Additionally, ultrafast transient absorption spectroscopy uncovers the additional charge carrier transfer pathways across this lattice-matched co-atomic interface. Thus, this unique co-atomic interface significantly promotes the interfacial electronic coupling and mitigates the charge transfer barrier, thus facilitating efficient charge separation and transfer. These insights underscore the importance of interfacial structure in heterojunction design and comprehending the intricate interplay between interface and carrier dynamics.
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Desalination and Water Treatment
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2024
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IF 1
Chao Wang,Su Xu,WenChao Liao,TsingHai Wang
Manganese oxide-based catalysts have been frequently adopted to activate peroxymonosulfate (PMS) for the degradation of refractory contaminants such as sulfamethoxazole (SMX). In this study, the Co-doped ɑ-MnO 2 catalyst was prepared to validate the concept that the introduction of additional oxidation states and structural defects due to the doping process would significantly enhance the efficiency of PMS activation. Among all Co@ ɑ-MnO 2 catalysts prepared, the activator with the mole ratio of Co/Mn 0.05:1 exhibited the highest SMX degradation. A near 100% removal of SMX (1000 μ g / L ) was achieved within 1 min in a condition with 10.0 mmol/L PMS and 0.5 g/L Co 0.05 @ ɑ - MnO 2 at 25 ℃ . The effects of catalyst dose, PMS concentration, initial SMX concentration, solution pH, temperature, and coexisting cations, anions, and humic acid (HA) on SMX degradation were studied. The impressive sustainability of the Co 0.05 @ ɑ-MnO 2 /PMS system was confirmed by its capability of operating over a wide pH range, its stability after multiple cycles, and its insensitivity to the coexisting of cations. The presence of high electrophilic anions, such as NO 2 ¯ and HCO 3 ¯ , on the other hand, would compromise the SMX degradation. Furthermore, reactive oxygen species (ROS) generated in the Co@ ɑ-MnO 2 /PMS system were identified by scavenger tests and electron paramagnetic resonance (EPR). Singlet oxygen ( 1 O 2 ) was verified to be the major route contributing to the degradation of SMX. In addition, sulfate radicals ( SO4 •¯ ), superoxide radicals (O 2 •¯ ), and hydroxyl radicals (ּ • OH) were also generated in the Co@ ɑ-MnO 2 /PMS system and participated in SMX degradation. Therefore, the Co@ ɑ-MnO 2 is a promising catalyst for PMS activation in the degradation of SMX.
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Molecular Catalysis
·
2024
·
IF 3.9
Mengyao Yun,Tao Chen,Ning Zhao,Zhenhua Li
Energy is of great importance for the development of modern society, which is mostly dependent on crude oil. Due to the severe pollution caused by using crude oil and the diminishing of crude oil reserves, it is urgent to look for clean oil from alternative resource other than crude oil. Currently, Coal-to-Liquid (CTL) or Biomass-to-Liquid (BTL) technology is an important way to produce clean liquid fuels through Fischer-Tropsch Synthesis (FTS) of syngas. For FTS process, catalyst is a main factor for affecting on syngas conversion and product distribution. For traditional oxides-supported catalysts, the mutual constraint between active metal loading and dispersion at high metal loading is hard to overcome, which will hinder the synthesis of high-performance FTS catalysts. In this paper, a new type of Co@SiO 2 -T (CS-T) and Co@SiO 2 -X (CS-X) catalysts with core-shell structure were prepared by using polyvinyl pyrrolidone (PVP) as the structural stabilizer, hexadecyl trimethyl ammonium Bromide (CTAB) as the templating agent and tetraethyl orthosilicate (TEOS) as the silica source. The effects of hydrothermal temperature and pyrolysis temperature on the catalyst physical-chemical properties and FTS performance were investigated. The results showed that increasing the hydrothermal temperature favored the formation of the core-shell structure of the catalysts. With the increase of pyrolysis temperature, the catalyst particle size decreased from 0.54 μm to 0.23 μm. The FTS activities of the catalysts showed a volcano trend with hydrothermal and pyrolysis temperatures.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Muhammad Sabir,Mahmoud Sayed,Zhuofan Zeng,Bei Cheng,Wang Wang,Chuanbin Wang,Jingsan Xu,Shaowen Cao
The photocatalytic conversion of carbon dioxide (CO 2 ) into valuable products holds great promise from environmental and economic perspectives. However, current photocatalytic materials still exhibit unsatisfactory efficiency. In this study, a notably efficient step-scheme (S-scheme) heterojunction was developed by combining the Co-MOFs with carbon nitride nanosheets (g-C 3 N 4 ). The electrostatic interaction between these components not only facilitates the exfoliation of g-C 3 N 4 layers but also enhances the stability of the photocatalyst structure. The optimal heterojunction Co-CN4 photocatalyst achieved a significantly enhanced CO production rate of 16.1 µmol g −1 h −1 , which is 4.7 times higher than that of pure g-C 3 N 4 . This improved activity is ascribed to the enhanced light absorption and mitigated charge carrier recombination. Density functional theory (DFT) computations in conjunction with experimental observations elucidate the establishment of a close contact interface. Additionally, electron paramagnetic resonance (EPR) and in situ X-ray photoelectron spectroscopy (XPS) characterization unveil the electron transfer pathway of Co-CN4 during photocatalytic CO 2 conversion. This study offers valuable insights into the design of S-scheme photocatalysts for enhancement of CO 2 photoreduction.
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Nanoscale Advances
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2025
·
IF 4.6
Yu Ma,Lan Yang,Shangdi Wu,Liran Xu,Hua Huang
Polydopamine (PDA) is a widely utilized photothermal conversion material recognized for its ease of synthesis and environmental friendliness. However, its relatively weak light absorption capabilities lead to lower photothermal efficiency, restricting its application in solar steam generation (STG) processes. To effectively enhance light absorption, this study introduces a deep co-deposition method for the microstructural design of STG membranes. Unlike traditional surface co-deposition methods, which coat a layer of PDA on the membrane surface, the deep co-deposition method allows for the incorporation of PDA within the internal nanohydrogel structural units of the membrane. This approach significantly increases the PDA loading, resulting in a marked enhancement of light absorption capabilities. In the near-infrared region (800–2500 nm), where the light absorption of PDA is relatively weak, the absorbance improved from 70.18% (surface co-deposition) to 88.20% (deep co-deposition). While PDA has been extensively studied across various fields, its application as a structural and functional additive in hydrogels remains limited, particularly in comparison to the rapid advancements in PDA-based surface-engineered hydrogels. Thus, this study may provide valuable insights for related research areas.
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