APPLIED CATALYSIS A-GENERAL
·
2009
·Vol. 358
·期 2
·173-179
·
IF 3.19
Guan Huang,Shang-Yue Liu,Yong-An Guo,Ai-Ping Wang,Jin Luo,Chun-Cai Cai
The search for a reusable material as an efficient and economic catalyst for hydrocarbon oxidation is an important field of research. In this study, we investigated the highly effective combination of support and metalloporphyrin provided by manganese tetraphenylporphyrin adsorbed onto a precursor of freshly precipitated aluminium hydroxide, followed by conversion to a manganese porphyrin/boehmite compound. This was characterized using FT-IR, UV–vis spectroscopic techniques, N 2 BET analysis, X-ray powder diffraction, transmission electron micrograph technique and thermal analysis. Aerobic oxidation of cyclohexane has been investigated using the compound as a catalyst under mild conditions and in the absence of any solvent and reductant. The results indicate that it has higher catalytic activity than manganese tetraphenylporphyrin and the corresponding chitosan-supported catalyst. In particular, the catalyst exhibits good atom economy for cyclohexane oxidation, high catalyst turnover number, and good ketone and alcohol selectivity. In particular, it has excellent reusability, with no change in original catalytic activity; a quantity of catalyst containing only 1 mg of Mn TPP can be reused 8 times under the promotion of beomite (BM). In addition, we examined the reaction conditions for the use of such nanoparticle-supported manganese tetraphenylporphyrin as a mild and environmental friendly oxidation catalyst.
研究领域:
催化化学
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纳米材料
·
绿色化学
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有机氧化反应
·
多相催化
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Zequn Yang,Hailong Li,Wenqi Qu,Mingguang Zhang,Yong Feng,Jiexia Zhao,Jianping Yang,Kaimin Shih
Mineral sulfide based sorbents were superior alternatives to traditional activated carbons for elemental mercury (Hg0) immobilization in industrial flue gas. A systematical study concerning the influence of sulfur trioxide (SO3) on Hg0 adsorption over a nanosized copper sulfide (Nano-CuS) was for the first time conducted. SO3 was found to significantly inhibit the Hg0 removal over Nano-CuS partially because SO3 oxidized the reduced sulfur species (sulfide) with high affinity to mercury to its oxidized sulfur species (sulfate). Moreover, a brand new “oxidation-reduction” mechanism that led to a simultaneous oxidation of sulfide and reduction of mercury on the immobilized mercury sulfide (HgS) was responsible for the inhibitory effect. Even though the released Hg0 from the reduction of mercury in HgS could be oxidized by SO3 into its sulfate form (HgSO4) and recaptured by the sorbent, the “oxidation-reduction” mechanism still compromised the Hg0 capture performance of the Nano-CuS because HgSO4 deposited on the sorbent surface could be easily leached out when environmentally exposed. These new insights into the role of SO3 in Hg0 capture over Nano-CuS can help to determine possible solutions and facilitate the application of mineral sulfide sorbents as outstanding alternatives to activated carbons for Hg0 immobilization in industrial flue gas.
研究领域:
环境科学
·
化学工程
·
污染控制
·
汞去除
·
气相吸附
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Jiyang Liu,Tianshu Wang,Jin Wang,Erkang Wang
A simple and versatile method is described to construct high performance three-dimensional (3D) graphene-based enzyme biosensor. Monolithic and macroporous 3D graphene foam grown by chemical vapor deposition (CVD) was used as a freestanding electrode for co-immobilization of horseradish peroxidase (HRP) and a commonly used redox mediator, methylene blue (MB). Carbon nanotubes (CNTs) were employed as carriers of MB molecules to immobilize them on 3D graphene surface through strong π-π stacking force. Mussel-inspired biopolymer polydopamine (PDA) was formed by in-situ polymerization and served as a green linker, which could covalently graft HRP on the surface of 3D graphene/MB-CNTs electrode. In addition, PDA layer could also effectively prevent the leakage of inner electron mediators. Owing to the 3D macroporous architecture, exceptional properties of graphene and surface-bound mediators, the biosensor demonstrated outstanding performance for reagentless detection of H 2 O 2 in terms of wide linear range (0.2 μM to 1.1 mM), high sensitivity (227.8 μA mM −1 cm −2 ), low detection limit (58.0 nM), and fast response (reaching 95% of the steady current within 3 s). The biosensor exhibited high reproducibility and stability.
研究领域:
材料科学
·
生物传感器与生物电子学
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纳米技术
·
酶工程
·
电分析化学
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DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2016
·Vol. 74
·期 7
·1680-1688
·
IF 1.064
Xu Feigao,Tan Wencheng,Liu Heng,Li Dan,Li Yuexiang,Wang Min
Crack-free PDMS-SiO 2 -TiO 2 composite as photocatalyst was prepared for degrading dyes by using thin-film fixed bed reactor. The hydrophobic surface of the photocatalyst loaded with PDMS-SiO 2 -TiO 2 composite could be considered as an extractant for organic pollutants. The effect of different supports including pumice stone, medicinal stone, and fiberglass for photocatalytic efficiency were compared. Under the same condition, it was found that the photocatalytic degradation effect of dyes was best when PDMS-SiO 2 -TiO 2 composite was fixed on pumice stone rather than medicinal stone or fiberglass. Furthermore, when pumice stone was used as the support for PDMS-SiO 2 -TiO 2 composite, the photocatalytic degradation effect of dyes hardly decreased after five cycles.
研究领域:
环境化学
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材料科学
·
光催化
·
废水处理
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DOI
高影响因子
TALANTA
·
2026
·
IF 6.1
Tai Ye,Shuying Yue,Long Bai,Haohao Chen,Chenyang Li,Rehemutula Wubuli,Kehua Dang,Min Yuan,Hui Cao,Ziqing Ye,Fei Xu
Co-immobilization of horseradish peroxidase (HRP) with G-quadruplex/hemin complex often suffer from low efficiency, intricate procedures, and reduced catalytic performance. To address these challenges, we developed a biomineralization strategy that integrates HRP and G-quadruplex/hemin into the single nanosheet structure. By engineering a split aptamer sequence into a G-rich domain, the nanosheets synergistically combine enhanced catalytic activity with better target-specific molecular recognition. Compared with either free HRP or it biomineralized counterpart alone, the prepared nanosheets exhibited markedly improved peroxidase-like activity. In the presence of enrofloxacin, specific aptamer-target binding facilitated the formation of a ternary complex on the electrode surface, enabling the catalysis of H 2 O 2 -mediated oxidation of TMB. Under the optimized conditions, the electrochemical aptasensor displayed a wide linear detection range of 1 nM–10 μM with a low detection limit of 0.53 nM. Beyond high selectivity, the sensor demonstrated excellent practical applicability in spiked milk and egg white samples. The generality of the developed platform was further confirmed by its successful extension to other antibiotics detection through replacing the split-aptamer pairs.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
·
2026
·
IF 3.5
Jiangtao Liu,Xinyue Liu,Lei Lei,Hui Guo,Ruyi Jin,Zhi Li,Hao Yan
A temperature/light dual-stimuli-responsive polymeric carrier PPEGMA-b-PNIPAM-hv-PMAA-b-PS was designed and synthesized through host-guest mutual recognition, and further applied for pectinase immobilization. Both the host molecule PPEGMA-b-PNIPAM-β-CD and the guest molecule PS-b-PMAA-Azo were prepared via ATRP, hydrolysis, and click chemistry, respectively. The characterization of polymeric structure and morphology was carried out by 1H NMR, FTIR, and GPC. This polymer could self-assemble into spherical micelles in aqueous media, the critical micelle concentration (CMC) and the micellar morphology were also examined by UV–Vis, TEM, DLS, fluorescence spectra, etc. The enzyme immobilization property of the enzyme carrier was investigated too. It was revealed when pH was 4.0, immobilization concentration was 8 U/mL, temperature was 25 °C, and immobilization time was 60 min, both the immobilized amount and the relative activity could reach the maximum. By comparison with free pectinase, immobilized pectinase had a better tolerance to the variation of temperature and pH, and enhanced storage stability and reusability. Moreover, the relative activity of immobilized pectinase could be easily regulated by adjusting the temperature or UV irradiation. So, we can predict this immobilization material has a great application potential in industrial catalysis.
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Tian Mao,Wenhong Han,Lingshuang Li,Jiaqi Zhao,Longtao Sun,Wendong Zhang,Xirui Lu,Yi Liu,Xiaoyan Shu
This study used Nd 2 O 3 as a simulant for trivalent actinides to systematically investigate the immobilization performance of a natural aluminosilicate glass (amphibolitic granulite). The microstructure and physicochemical properties of the waste forms were characterized in detail by XRD, FTIR, Nd L 3 -edge XANES, EXAFS, and electron microscopy. Their mechanical properties and chemical durability were evaluated via density and hardness measurements, as well as product consistency testing (PCT). The sample with the maximum solid solubility of 38 wt % Nd 2 O 3 exhibits a high density of 3.37 g/cm 3 , a Vickers hardness of approximately 8.19 GPa, and a normalized mass loss of 1.46 × 10 −6 g m −2 after 42 days. Overall, this natural aluminosilicate matrix is a promising candidate for the immobilization of high-level radioactive waste, indicating outstanding physical and chemical stability.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Jiandong Cui,Yuxiao Feng,Tao Lin,Zhilei Tan,Cheng Zhong,Shiru Jia
Metal–organic frameworks (MOFs) have recently emerged as a promising candidates for the immobilization of enzymes due to their diversified structures and porosity. However, a lack of good size and morphological control over the as-prepared MOFs has limited their practical applications in some cases. Herein, instead of zeolitic imidazolate framework-8 (ZIF-8) with the standard rhombic dodecahedral morphology, we successfully synthesize a novel mesoporous catalase@ZIF composite with cruciate flower-like morphology by embedding catalase molecules into uniformly sized ZIF crystals. With extraordinarily large mesopore size and high protein loading capacity, the catalase@ZIF composites with cruciate flower-like morphology exhibit 400% higher activity than that of catalase@ZIF composites with conventional rhombic dodecahedral morphology, and show higher reusability than conventional rhombic dodecahedral morphology. More importantly, we demonstrate for the first time that the biomacromolecules (proteins) can not directly regulate the crystal size, morphology, and crystallinity of ZIF-8. Moreover, the crystal morphology of ZIF has primary dependence on concentrations of 2-methylimidazole and Zn2+ ions, and can be directly controlled by adjusting concentrations of Zn2+ ions while keeping the high concentration of 2-methylimidazole.
研究领域:
生物化学
·
纳米材料科学
·
生物催化
·
药物递送系统
·
结构生物学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Hao Dong,Kang Wang,Di Zhou,Yoshihiro Ito,Lihua Hu,Zhengbiao Zhang,Xiulin Zhu
Recent advances in the enrichment of semiconducting single-walled carbon nanotubes (s-SWCNTs), particularly via conjugated polymers extraction, allow for their wide applications with unique performances, especially for transistors and sensors. Both the low-cost enrichment and convenient device fabrication of s-SWCNTs have become high-priority and challenging tasks. In this study, we demonstrate that a dopamine functionalized thiophene-fluorene copolymer has the capability of selectively dispersing not only HiPco (0.7–1.2 nm) but also large diameter Arc-Discharge (1.2–1.7 nm) s-SWCNTs with a high efficiency and certain chirality in polar solvent tetrahydrofuran . Moreover, it is convenient to immobilize the obtained conjugated polymer wrapped s-SWCNTs on universal substrates, such as films and particles, based on the dopamine structure feature, which would facilitate the further development of their multifarious applications.
研究领域:
材料科学
·
纳米技术
·
化学工程
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DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2019
·
IF 0
Zhi Min Ou,Jia Ying Pan
In this study, magnetic chitosan microspheres (Fe3O4-CTS) were prepared via chemical co-precipitation and cross-linked with lipase using glutaraldehyde to form Fe3O4-CTS-glutaraldehyde-lipase particles. The textural characteristics of Fe3O4-CTS-glutaraldehyde-lipase particles were assessed by scanning electron microscopy. The optimal immobilization conditions were 2.1 mg/mL lipase, 10 mg/mL Fe3O4-CTS-glutaraldehyde, pH 7.5, 30 °C, 2 h. The loading amount of lipase was 126.0 mg/g carrier, and the specific activity reached to 46.7 U/mg. Fe3O4-CTS-glutaraldehyde-lipase particles was used in resolution of racemic 1-phenylethylamine in a solvent-free system. The conversion and enantiomeric excess of (R)-N-(1-phenylethyl)acetamide reached 33.6% and 97%.
研究领域:
生物催化
·
纳米技术
·
酶工程
·
有机合成
·
手性拆分
✓ 已验证
DOI
BIOSENSORS & BIOELECTRONICS
·
2025
·
IF 10.5
Yue Huang,Yang Liu,Chuan Dong,Qi Zan,Feng Feng,Ruibing Wang,Shaomin Shuang
Mitophagy is a key pathway for regulating mitochondrial quality and quantity which is essential for the preservation of cellular homeostasis. Mitophagy process may be accompanied by changes of the mitochondrial microenvironments. The multifunctional fluorescent probe is crucial for the precise detection of multiple microenvironments, which is vital for the visualization of mitophagy. Herein, a mitochondria-immobilized fluorescent probe DPP was designed and fabricated to visualize mitophagy by monitoring polarity and viscosity in dual-channel. The DPP is characterized by "D-π-A" structure, which provides the basis for the intramolecular charge transfer (ICT) and twisted intramolecular charge transfer (TICT) platform, enabling dual-channel responses to polarity and viscosity at emission wavelengths of 487 nm and 656 nm, respectively. The significant wavelength gap (169 nm) between the above channels prevents signal crosstalk. Additionally, the incorporation of 1, 4-dibenzyl chloride grants the probe mitochondrial immobilization capabilities, avoiding the leak of probe due to mitochondrial depolarization during autophagy. The DPP accumulates in mitochondria and monitors polarity and viscosity changes in green and red channels, respectively. Notably, the investigation of the relationship between polarity and viscosity revealed that an increase in viscosity is accompanied by a decrease in polarity. The mitophagy was effectively observed through the induction of DPP by rapamycin, with a particular emphasis on the increase in viscosity and decrease in polarity. Thus, DPP offers a powerful tool for a deeper understanding of the physiological and pathological processes associated with mitophagy and are regulated by various microenvironmental parameters.
研究领域:
细胞生物学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2012
·
IF 5.602
Huan Guo,Cui Ye,Hanchang He,Zhiwu Chen,Jianqiang Hu,Guanqi Hu,Aiqing Li
Neodymium (Nd) substituted bismuth titanate (Bi 4− x Nd x Ti 3 O 12 , BNTO- x ) nanoplates inlaid one another were prepared by sol–gel hydrothermal method, which was explored for protein immobilization and biosensor fabrication. Comparative experiments witnessed that Bi 3+ ions in bismuth titanate (Bi 4 Ti 3 O 12 , BTO) were successfully substituted with Nd 3+ ions, and the electrochemical properties of the Hb–Chi–BNTO biosensors closely depended on the Nd 3+ ion content. With increasing the Nd 3+ doping content, the electrochemical performance of the Hb–Chi–BNTO- x biosensors showed regularly variable. Moreover, compared with the Hb–Chi–BTO and other Hb–Chi–BNTO- x biosensors, the Hb–Chi–BNTO-0.85 biosensor had more excellent electrochemical and electrocatalytic properties such as stronger redox peak currents (approximately three-fold), smaller peak-to-peak separation (50 mV), larger heterogeneous electron transfer rate (14.1 ± 3.8 s −1 ), higher surface concentration of electroactive redox protein (about 8.16 × 10 −11 mol/cm 2 ), and better reproducibility and stability. The Nd-depended electrochemical properties of the Hb–Chi–BNTO biosensors may open up a new idea for designing third-generation electrochemical biosensors, and the BNTO-0.85-based biosensor is also expected to find potential applications in many areas such as biomedical, food, and environmental detection.
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产品关联
DOI
PubMed
高影响因子
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