Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yiwei Sun,Xiaoli Wei,Fangcao Liu,Bing Liu,Jiaming Zhao,Yubao Bi,Wenfeng Han
Developing effective techniques to produce and stabilize highly active metastable F-Al-O species in HFCs dehydrofluorination system without being over-fluorinated to Al-F is a major challenge. Herein, we report a new strategy for the formation and stabilization of metastable species. Using NaH 2 PO 4 as a P source, phosphoric acid groups are modified to the surface of Al 2 O 3 leading to the fabrication of AlPO 4 /Al 2 O 3 interface. P and Al 2 O 3 bond to form Al-O-P structure at the interface and stabilize F-Al-O in the dehydrofluorination system. Further studies show that AlPO 4 /Al 2 O 3 interface increase the oxygen vacancy content of catalyst and accelerate the conversion of HFC-152a on the catalyst surface. Meanwhile, AlPO 4 /Al 2 O 3 interface improves the surface acidity of Al 2 O 3 , endue a large number of Lewis weak acid sites, reducing the carbon accumulation of catalyst, and improving the stability of catalyst. The activity test showed that AlPO 4 /Al 2 O 3 interface shows high catalytic performance (74.2 %) and excellent stability (50 h) for 1,1-difluoroethane dehydrogenation compared with Al 2 O 3 (30 % and low stability) without P modification.
研究领域:
化学工程
·
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2013
·Vol. 5
·期 6
·1469-1473
·
IF 1.855
Dan Wu,He Li,Xiaodong Xue,Haixia Fan,Qiang Xin,Qin Wei
A sensitive and selective sensor was developed for dopamine (DA) determination based on a molecularly imprinted electropolymer of o-phenylenediamine (OPD). A very small quantity of biocompatible sulfonated graphene was modified onto Au electrode to enhance the current response. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were employed to characterize the molecular imprinted (MIP) sensor. Several important parameters controlling the performance of the molecularly imprinted sensor were investigated and optimized. Under optimum condition, DA can be determined in the range of 0.5–7.0 mg L−1 and the low detection limit is 0.11 mg L−1. Ascorbic acid (AA) almost did not interfere in the determination of DA when the concentration molar ratio of 50 : 1. The prepared sensor had been applied to the analysis of DA in human serum samples with satisfactory results. It also showed stable reproducibility and can be easily fabricated at low cost.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Xue Tian,Shuang Wang,Jinsheng Li,Fengxiang Liu,Xu Wang,Hao Chen,Hongzhe Ni,Zhe Wang
Polybenzimidazole (PBI)/ionic liquid (IL) functional Si–O–Si network composite membranes are prepared from PBI with 1-(3-trimethoxysilylpropyl)-3-methylimidazolium chloride. The IL can be hydrolyzed to form Si–O–Si network structure under acidic conditions. And such IL functional Si–O–Si network (NP) in the composite membranes could improve phosphoric acid doping levels and proton conductivities simultaneously. The ability of retaining more PA is also reflected in the high proton conductivity value of PBI/NP-15% membrane which shows almost three-fold increment compared to the pristine PBI. All the PBI/NP-X composite membranes display excellent chemical stability and improved mechanical strength . This is attributed to Si–O–Si network structure. Moreover, PBI/NP composite membranes have demonstrated high thermal stability up to 250 °C, which is attractive for high-temperature (>200 °C) proton exchange membrane fuel cells.
研究领域:
材料科学
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Jimin Qiu,Yuchen Ji,Wenfang Li,Yuhang Li,Wenguang Zhao,Yunxing Zuo,Weiyuan Huang,Chen Zhu,Mingjian Zhang,Guorui Zheng,Luyi Yang,Feng Pan,Zu-Wei Yin
Lithium cobalt oxide (LiCoO2) cathodes suffer serious structure instability when charged to high voltage (>4.5 V), including H1-3 phase transition, cobalt dissolution, and interfacial side reactions, which are closely related to the instability of surface lattice oxygen. Herein, an interfacial B–O complexing strategy was proposed to stabilize the surface lattice oxygen of LiCoO2 at 4.6 V, through the preferential coordination between derived products of the tris(pentafluorophenyl)borane electrolyte additive and LiCoO2. Combining a series of in situ and ex situ characterization methods with temporal and spatial resolution, it was revealed that the emergence of peroxy-like species (O22–) at high potentials is one of the origins of the instability of LiCoO2, which can be well inhibited thanks to interfacial B–O complexing. Thus, oxygen loss and interfacial side reactions can be drastically retarded, which consequently provides a more stable chemical environment for Co element, avoiding the dissolution and valence reduction of Co. Owing to the well-anchored Co and O elements, undesirable phase transition and local coordination structure change are suppressed, hence improving the capacity retention and rate performance of LiCoO2 at 4.6 V. This study provides an interfacial complexing strategy to stabilize the high-voltage LiCoO2 cathode.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2014
·
IF 3.096
Weiqiang Huo,Weixin Zhang,Wei Wang,Xiaohua Zhou
Two types of microcapsules (MCs) were prepared by the emulsion cross-linking method, where biguanidino chitosan (BGCS)and O -carboxymethyl chitosan ( O -CMCS) served as the wall materials, and the antibacterial agent 2,4-diamino-6-(2-pyridyl)-1,3,5-triazine (PyTNH) served as a model water-soluble drug. The physicochemical performance of the MCs and their drug release behavior were investigated by Fourier transform infrared spectroscopy, thermogravimetric analysis/derivative thermogravimetric analysis, scanning electron microscopy, and swelling and in vitro drug release studies of the two MCs with unmodified chitosan-MCs (CS-MCs) used as the control. The results indicated that the degree of cross-linking, encapsulation efficiency, and thermal stability of the shell wall of the BGCS-microcapsules (BGCS-MCs) were much higher than those of the control and the O -CMCS-microcapsules (CMCS-MCs), owing to the reduction of steric hindrance and development of the conjugation effect in the cross-linking process. Studies on the swelling and in vitro drug-release behavior revealed a sustained release effect of the BGCS-MCs. Moreover, the CMCS-MCs were found to exhibit a pH-dependent drug release behavior, which can be attributed to the successive formation of H-bonds and repulsive forces with the change in the pH of the medium. Based on these results, the swelling-release models and the drug release kinetics of BGCS-MCs and CMCS-MCs are proposed.
研究领域:
药剂学
·
生物材料学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Huimin Li,Zhe Sun,Chenlong Dong,Xueli Zhang,Chengkun Lei,Baobao Jin,Qianqian Shen,Husheng Jia,Jinbo Xue
Photocatalytic non-oxidative coupling of methane is an attractive strategy for CH 4 to C 2 conversion, how to facilitate the photogenerated charge separation and accelerate the C–C coupling to promote the reaction kinetics remains a great challenge. Herein, a symbiotic r-Fe 2 O 3 /NiO heterostructure with robust interfaces is constructed in situ. The coherent interface not only provides unique Ni–O–Fe asymmetric sites, but also achieves the separation and transport of photogenerated charge. The unbalanced charge density distribution of two adjacent methyl or methylene at the Ni–O–Fe asymmetric site alleviates the dipole repulsion of the C–C coupling, and promotes C–C coupling to form C 2 hydrocarbons. Under visible light irradiation, the optimal r-Fe 2 O 3 /NiO performs a brilliant C 2 activity up to 71.00 μmol g −1 h −1 , and the C 2 H 4 yield can reach a high value of 40.46 μmol g −1 h −1 and the selectivity of 56.98 %. This work provides new insights into the coupling of C–C to generate C 2 hydrocarbons.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ETHNOPHARMACOLOGY
·
2015
·
IF 2.998
Hui-Hui Xiao,Quan-Gui Gao,Ming-Xian Ho,Yan Zhang,Ka-Chun Wong,Yi Dai,Xin-Sheng Yao,Man-Sau Wong
Ethnopharmacological relevance Sambucus williamsii Hance (SWH), which belongs to the Caprifoliaceae family distributed in various regions of China, Korea and Japan, has been used as a folk medicine for treatment of bone and joint diseases in China for thousands of years. In previous studies, SWH was shown to possess anti-osteoporosis, healing fracture, anti-inflammatory and analgesic activities. Our previous studies showed that SWH extract effectively suppressed ovariectomy-induced increase in bone turnover and improved bone mineral density and bone biomechanical strength in rats as well as in mice. An 8- O -4′ norlignan, (7 R ,8 S )-1-(4-hydroxy-3-methoxyphenyl)-2-[4-(3-hydroxypropyl)-2-methoxyphenoxy]-1,3-propanediol (PPD) was previously isolated and identified as the bioactive ingredient in SWH. The present study aimed to characterize the bone protective effects as well as its mechanism of actions in osteoblasts. Materials and methods Bone protective actions of PPD on different cells were determined by proliferation assay, alkaline phosphatase (ALP) activity assay, calcium deposition as well as real-time reverse transcriptase-polymerase chain reaction (RT-PCR). In addition, estrogen receptor (ER) antagonist ICI182,780 and mitogen-activated protein kinase kinase (MEK) inhibitor U0126 blocking assays, competitive ER radioligand binding assay, ERE-dependent luciferase reporter assay and immunoblotting were used to determine if PPD activated ER and if the effects of PPD on osteoblastic functions were ER dependent. Results PPD exerted anabolic effects in osteoblasts and its effects were abolished by co-incubation with ICI182,780 or U0126. PPD induced mRNA expressions of Runx2, ALP, osteocalcin, and increased the ratio of osteoprotegerin/receptor activator of nuclear factor κB (OPG/RANKL). PPD failed to bind to either ERα or ERβ and did not activate ERE-luciferase activity via ER. PPD induced the phosphorylation of extracellular regulated kinases (ERK) and its effect was completely abolished by U0126. It also induced the phosphorylation of ERα at serine 118. Conclusion These data show that PPD is a bioactive compound in SWH that exerts oestrogen-like actions in osteoblast-like cells via ligand-independent, estrogen response element (ERE)-independent and mitogen-activated protein (MAP) Kinase-mediated rapid nongenomic ER signaling pathway.
研究领域:
民族药理学
·
分子生物学
·
骨代谢研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Zhongtao Shang,Tao Zhang,Qiao Yang,Dingke Wang,Yuyi Liao,Dongjia Xie,Yiyang Dai,Yuan Wang,Shaojun Yuan
Nanocomposites consisting of metal oxide and carbon materials are usually preferred as electrode for electrochemical energy storage. Nonetheless, their unsatisfied capacitance hinders the reached energy density of aqueous supercapacitors (SCs). Herein, Fe 2 O 3 /carbon heterointerface was constructed on porous carbon fiber (PCF), which could serve as an efficient active site for stabilizing K + and Na + storage. The theoretical calculations revealed the enhanced accumulation and transfer of charges around the Fe 2 O 3 /carbon interface, thus favoring the electron transfer and boosting the faradaic reaction. The interactions of Fe 2 O 3 and PCF was found to simultaneously cause faster ion transfer and more surface charge storage, which made the as-prepared Fe 2 O 3 @PCF electrode deliver a superior SCs performance in 2 M KCl or 1 M Na 2 SO 4 electrolyte. The asymmetric aqueous supercapacitor devices consisted of Fe 2 O 3 @PCF and MnO 2 /CC electrodes with maximum operating potential of 2.0 V achieved a high areal energy density of 0.126 mWh cm −2 at a power density of 1.2 mW cm −2 along with good stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Xinjun He,Mengqiao Gao,Fukun Li,Zhiyang Tang,Jie Qu,Jinxing Long,Qiang Zeng,Xuehui Li
Catalytic hydrogenolysis of lignin has attracted steady attentions in regard of producing high-value aromatic chemicals from the renewable resource and achieving the “carbon neutrality” goal. However, current techniques for lignin hydrogenolysis are highly challengeable due to the necessity of pure H2 and relatively low yields in monomers. In this work, a novel and efficient approach has been proposed for the conversion of lignin to monophenols under readily available and cost-effective syngas. The results demonstrated that CO has the dramatic promotion on the bagasse lignin hydrogenolysis over commercialized Pd/C at 230 °C for 4 h, the yield of monophenols reaches 357.2 mg/g at 3.0 MPa syngas (CO/H2=2/1), which is approximately 1.7 times of that under pure H2. As evidenced by quantitative 31P NMR analysis, the promoting effects of CO on lignin depolymerization are positively correlated with the content of side-chain hydroxyl groups in lignin. Further investigations on lignin model conversion reveal that CO suppresses the dehydroxylation at Cα-OH, with concomitant enhancement of Cβ-O bond cleavage (increasing from 10% in H₂ to 64% in syngas). This inhibitory effect on side-chain hydroxyls elimination directly correlates with the 1.7-fold increase of monophenol yields observed during catalytic depolymerization. Therefore, this work provides a new insight in lignin depolymerization using industrial catalyst of Pd/C and the cost-effective syngas.
研究领域:
化学工程
·
可再生能源
·
催化
·
生物质转化
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL SCIENCES
·
2017
·Vol. 129
·期 3
·289-294
·
IF 1.235
LIU YAOWEN,ZHAO FEN,ZHOU HAOHUA,XIE KAI,JIANG YUBO
CuI-catalyzed selective Ullmann C–O coupling of 1,4-disubstituted 1,2,3-triazole bromides with phenols were achieved through the coordination of N(2) atom. The ortho C–Br bond in N(1) aryl can be selectively coupled with phenols, while other C–Br bonds remain inert, generating ortho aryloxyl 1,4-diaryl 1,2,3-triazoles.
CuI-catalyzed selective Ullmann C–O couplings of 1,4-disubstituted 1,2,3-triazole bromides with phenols were achieved through the coordination of N(2) atom in triazole. The ortho C-Br bond in N(1) of aryl can be selectively coupled with phenols, while other C-Br bonds remain inert, generating ortho -aryloxyl 1,4-diaryl 1,2,3-triazoles.
研究领域:
有机化学
·
药物化学
·
生物有机化学
·
催化化学
·
合成方法学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Ju Liu,Danna Yan,Qianying Chen,Huayong Peng,Lu Jin,Chong Feng,Lixia Zhang,Guomin Zhao,Depo Yang,Zhimin Zhao
In this study, a homogeneous polysaccharide, named YDOP-1 was isolated form Dendrobium officinale using hot water extraction and ethanol precipitation method. YDOP-1 was characterized to be a typical O -acetyl-glucomannan with the molecular wight was 13,456 Da. Cell viability and colony forming assay showed that YDOP-1 possess moderate anti-gastric cancer effects. In order to further improve the anti-gastric cancer effects of YDOP-1, a selenium modification on YDOP-1 was performed. Energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS) analysis demonstrated that the Se was successfully introduced into YDOP-1 by forming Se O bonds. Se modification significantly enhanced the anti-gastric cancer effects of YDOP-1, which could effectively inhibit the proliferation of MGC-803 cells via suppressing colony and inducing apoptosis by regulating the apoptosis proteins of Bax, Bcl-2, and Caspase-7. Our results indicated that the Se modified O -acetyl-glucomannan, YDOP-Se, was expected to be useful in the biomedicine field for the gastric cancer treatment.
研究领域:
药用植物学
·
肿瘤生物学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 10
·2531-2537
·
IF 3.431
Cheng Hao,Wu Shubin,Huang Jinbao,Zhang Xiaohua
Although o -quinonemethide (6-methylene-2,4-cyclohexadien-1-one) has been proposed as a key intermediate in char formation during the pyrolysis of guaiacol (2-methoxyphenol), direct evidence of this (e.g., spectroscopic data) has not yet been provided. Using in situ FTIR spectroscopy, the pyrolysis of guaiacol was investigated from 30 °C to 630 °C at 40 °C/min. The IR profiles showed direct evidence of o -quinonemethide production at about 350 °C, which vanished rapidly at around 420 °C in the vapor phase, indicating char formation. In addition, at 400 °C, salicyl aldehyde was observed, which decomposed slowly at about 500 °C. In combination with the known products of guaiacol pyrolysis, these results allowed the major reaction pathways of guaiacol pyrolysis to be discerned. Density functional theory calculations were performed, and the results were found to be in good agreement with the experimentally obtained IR profiles. These findings provide guidance on how to suppress secondary reactions of guaiacol during lignin pyrolysis.
On-line analysis of pyrolysis process of guaiacol using in situ FTIR
研究领域:
化学
·
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）