Catalysts
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2019
·Vol. 9
·期 7
·596
·
IF 3.444
Ying Liu,Huan Zhang,Cong Ma,Nan Sun
Precious metal-free NiMoM (M = Pr2O3, Cu2O) catalysts have been synthesized through a simple coreduction method, without any surfactant or support material, and characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The resultant Pr2O3- or Cu2O-modified NiMo catalysts exhibit different structures, which is due to a difference in the synergistic effects of NiMo and the modifying elements. NiMoPr2O3has an amorphous structure, with low crystallinity and uniform particle dispersion, while NiMo@Cu2O adopts the core–shell structure, where the core and shell are synergistic with each other to promote electron transfer efficiency. The support material-free nanocatalysts Ni9Mo1(Pr2O3)0.375and Ni4Mo@Cu2O are both highly efficient compared with bimetallic NiMo catalysts, in terms of hydrogen generation from hydrous hydrazine (N2H4·H2O) at 343 K, with total turnover frequencies (TOFs) of 62 h−1and 71.4 h−1, respectively. Their corresponding activation energies (Ea) were determined to be 43.24 kJ mol−1and 46.47 kJ mol−1, respectively. This is the first report on the use of Pr-modified NiMo and core–shell NiMo@Cu2O catalysts, and these results may be used to promote the effective application of noble metal-free nanocatalysts for hydrogen production from hydrous hydrazine.Keywords:NiMoM (M = Pr2O3, Cu2O) catalysts;hydrous hydrazine;hydrogen production
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 10
·2727-2735
·
IF 5.934
Xue Song,Pan Yang,Jingchuan Wang,Xiaochong Zhao,Yuanlin Zhou,Yintao Li,Lijun Yang
The exploration of highly efficient catalysts for the hydrolysis of hydrous hydrazine is of great significance for the achievement of future hydrogen economy. In this regard, herein, a catalyst with NiFePd loaded on the metal–organic framework (MOF) UiO-66 was successfully prepared by a simple and safe chemical impregnation method. Due to its high specific surface area, the as-prepared NiFePd/UiO-66 catalyst exhibited efficient catalytic performance for the generation of hydrogen from hydrous hydrazine in an alkaline solution. The results showed that the Ni0.25Fe0.25Pd0.5/UiO-66 catalyst exhibited optimal properties for the decomposition of hydrous hydrazine in an alkaline aqueous solution with a nearly 100% hydrogen selectivity, good activity, and the high total turnover frequency (TOF) value of up to 662.4 h−1 at 80 °C. Moreover, the Ni0.25Fe0.25Pd0.5/UiO-66 catalyst exhibited good durability, which slightly decreased after five cycles of catalytic reaction at 60 °C.
研究领域:
材料科学
·
催化化学
·
能源化学
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产品关联
DOI
高影响因子
SENSORS
·
2019
·Vol. 20
·期 1
·140
·
IF 3.031
Yaqi Lu,Dan Wu,Ziyin Li,Quanjie Lin,Xiuling Ma,Zhangjing Zhang,Shengchang Xiang
It very important to be able to efficiently detect hydrazine hydrate in an aqueous medium due to its high toxicity. Here, we have proposed a new idea: to construct a sensor for the rapid determination of hydrazine hydrate based on the nano-CuO derived by controlled pyrolysis of HKUST-1 [Cu3(BTC)2(H2O)3]. The as-prepared CuO at 400 °C possesses a uniform appearance with nano-structure via SEM images, and the nano-CuO-400 has exhibited excellent electrocatalytic activity towards hydrazine oxidation. Amperometrici-tcurves shows the peak current as linearly proportional to the hydrazine concentration within 1.98–169.3 μmol L−1and 232–2096 μmol L−1with the detection limit of 2.55 × 10−8mol L−1and 7.01 × 10−8mol L−1, respectively. Moreover, the sensor constructed in the experiment shows good selectivities, and it is feasible to determining actual water samples.
研究领域:
分析化学
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材料科学
·
环境科学
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DOI
高影响因子
CHEMPHYSCHEM
·
2025
·
IF 2.2
Hao Yu,Mukendi Archip Tshimanga,Tshimanga Landry Wa Tshimanga,Meng Gao
Graphical Co−B/SBA-15 catalysts are prepared through an impregnation chemical reduction process. The hydrogen hydrolysis performance is meticulously investigated using the water displacement method. Through detailed experimental procedures and comprehensive analysis, the findings highlight the significant potential of Co−B/SBA-15 catalysts in hydrogen production applications, emphasizing the importance of catalyst structure and preparation methods on their performance metrics. Hydrolysis of NaBH 4 has garnered great concern in the production of hydrogen. Four different cobalt loadings (5 wt.%, 10 wt.%, 12.5 wt.% and 15 wt.%) were impregnated on SBA-15 molecular sieve. The effect of Co loading on the catalytic performance of the CoB/SBA-15 catalysts for NaBH 4 hydrolysis using the drainage method was studied. Characterizations using XRD, SEM, XPS, and N 2 adsorption-desorption were analytically conducted to examine the physiochemical properties of the CoB/SBA-15 catalyst. The catalytic activity test revealed that the optimum Co loading was 10 wt.% at which the maximum rate of hydrogen production was 153.0 mL/min⋅gcat, higher than the other samples. In addition, the effect of Co loaded, catalyst amount, and temperature were examined. Furthermore, the stability of the catalyst was maintained after five cycles. Cobalt-based catalysts are a promising catalytic system for hydrogen generation by hydrolysis of NaBH 4 .
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Zhanxian Li,Wenying Zhang,Chunxia Liu,Mingming Yu,Hongyan Zhang,Liang Guo,Liuhe Wei
It is significant to develop probes for rapid, selective, and sensitive detection of the highly toxic hydrazine in both environmental and biological science. In this work, under mild condition, a novel colorimetric and ratiometric fluorescent probe ( probe 1 ) was synthesized. Probe 1 with a chemoselective reaction mediated by hydrazine in which the diethyl malonate moiety was transformed into an aldehyde group exhibited high sensitivity and good selectivity in hydrazine recognition. Probe 1 can quantitatively detect hydrazine in concentration range from 0 to 120 μM with the LOD of 1.6 μM. Further, it displayed good selectivity and anti-interference over many species including some nucleophilic species, anions and metal ions. The ratiometric fluorescence change of this probe upon addition of hydrazine in living cells has been successfully demonstrated. Furthermore, the probe displays low dark toxicity under physiological temperature.
研究领域:
环境科学
·
生物化学
·
分析化学
✓ 已验证
DOI
高影响因子
TALANTA
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2020
·
IF 5.339
Kun Zhang,Yan Huang,Yin-Jing Shen,Shuang Ma,Ting-Ting Chen
The development of convenient and efficient fluorescence techniques is of great significance for selective detection and precise determination of biotoxic N 2 H 4 in human health and environmental sciences. By the pre-organization-assisted template synthesis , disclosed here is a luminescent Sm(III) macrocycle-based probe Sm - 2 m bearing dynamic imine bonds as recognition moieties which provides the selective and ratiometric turn-off fluorescence sensing for N 2 H 4 over various amine species based on the N 2 H 4 -induced structure transformation. This fluorescent sensing process finished within 20 min shows the low limit of detection (0.18 μM, 7.2 ppb) and wide linear sensing range (0–60.0 μM). Furthermore, probe Sm - 2 m is also be used to quantitatively determine N 2 H 4 in vapor gas and water samples through fluorescence color changes, which are evaluated by the Sm - 2 m -impregnated test paper strips and RGB value outputs. Finally, our proposed smartphone-based analytical method gives satisfactory N 2 H 4 detection results. It is thus believed that this work can shed some lights on development of optical probes and detection techniques for N 2 H 4 , even other hazardous chemicals.
研究领域:
化学
·
环境科学
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生物医学
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产品关联
DOI
PubMed
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Liu Xina,Zhu Meiqing,Xu Chenyang,Fan Fugang,Chen Panpan,Wang Yi,Li Dongyang
As an inorganic small molecule pollutant, the toxicity and potential carcinogenicity of hydrazine (N2H4) are of increasing concern. In this work, A water-soluble fluorescent probe (OCYB) based on the intramolecular charge transfer (ICT) mechanism for the detection of hydrazine was designed and synthesized. Taking the advantage of 4-bromobutyryl as the recognition group, the high selectivity of OCYB to N2H4 was confirmed by steady-state fluorescence spectroscopy. The limit of detection (LOD) was calculated to be 78 nM in the DMSO-HEPES (pH 7.4) system. The detection mechanism was verified by NMR, HRMS and density functional theory (DFT) calculations. In addition, OCYB exhibits strong anti-interference ability and an “Off-On” fluorescence enhancement effect. Importantly, OCYB can be used to effectively monitor the fluorescence distribution of N2H4 in environmental water samples and organisms.
研究领域:
分析化学
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环境科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
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2023
·
IF 6.2
Shuang-Shuang Liu,Wei-Na Wu,Xiao-Lei Zhao,Yun-Chang Fan,Yuan Wang,Zhi-Hong Xu
The microenvironments of biological systems are associated with the pathology of organisms. This study, aimed to construct a hemicyanine-based probe ( 1 ), which can respond to mitochondrial viscosity and hydrazine (N 2 H 4 ), for imaging application in living cells and zebrafish. The probe showed no fluorescence due to the intramolecular rotation in the solution; however, it exhibited a strong emission at 730 nm when the molecules were restricted to a high-viscosity environment. The addition of N 2 H 4 caused an elimination reaction of the N-substituted group in the pyridinium part and further broke the C C bond to produce a highly fluorescent hydrazone . Also, the probe could selectively and quantitatively detect N 2 H 4 via the fluorescence enhancement at 510 nm in a concentration range of 0 μM–140μM, with the limit of detection being 0.0485 μM. This probe may be used to study diseases related to N 2 H 4 and viscosity changes in biological systems. Furthermore, the analysis methods based on probe 1 for N 2 H 4 detection in soil, water, and air samples were successfully established.
研究领域:
生物化学
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环境科学
·
医学影像
✓ 已验证
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Jiajun Shi,Haoxue Tan,Zhonglong Wang,Xiaoqin Yang,Xiaoping Rao,Ping Zhao,Qian Jiang
Hydrazine (N 2 H 4 ) and bisulfite (HSO 3 – ) detection methods are urgently needed due to its harmful to the human health and environment safety. Herein, we reported a dual-response fluorescence probe EPC , which is capable of sequential detection of N 2 H 4 and HSO 3 – by two different fluorescence signals. The probe EPC itself showed yellow florescence. In presence of N 2 H 4 , probe EPC exhibited an obviously fluorescence change (from yellow to green). However, a new addition product came into being after probe EPC mixed with HSO 3 – , followed with weak yellow emission. More important, probe EPC exhibited excellent fluorescence response properties for N 2 H 4 and HSO 3 – , such as high sensitivity (0.182 µM for N 2 H 4 , 0.093 µM for HSO 3 – ), rapid response (55 s for N 2 H 4 , 45 s for HSO 3 – ), excellent selectivity and anti-interference performance. The sensing mechanisms for N 2 H 4 and HSO 3 – were proved by 1 H NMR and MS spectra. Practical applications were studied. EPC based test paper can be utilized for quantitative detecting N 2 H 4 in actual water samples. And, probe EPC has been successfully applied to recognize N 2 H 4 contaminant in soil samples. Moreover, EPC has great potential to be used to detect HSO 3 – in real food samples.
研究领域:
分析化学
·
环境科学
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DOI
PubMed
高影响因子
DYES AND PIGMENTS
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2020
·
IF 4.613
Wenfang Liu,Haishuang Jia,Jie Zhang,Ling Shao,Jun Wang,Dawei Fang
In this work, a novel dual-excitation and dual-emission fluorescent probe , CDs–COO–Fluorescein (CDs–COO–F), for the specific detection of hydrazine (N 2 H 4 ) was designed and synthesized through esterification reaction of carbon dots (CDs) and fluorescein (F). The prepared CDs were characterized by TEM, XPS , XRD and FT-IR and the optical properties of CDs and CDs–COO–F were described by UV–vis and fluorescence spectra. On the other hand, the affecting factors including hydrazine (N 2 H 4 ) concentration and interfering substances on the hydrazine (N 2 H 4 ) detection were researched. The high sensitivity and high selectivity of CDs–COO–F in detection hydrazine (N 2 H 4 ) could be confirmed. Two good linear responses of fluorescence emission intensities of CDs–COO–F at 462 nm and 515 nm as functions of hydrazine (N 2 H 4 ) concentration were obtained, respectively. The limits of detection hydrazine (N 2 H 4 ) were 0.504 μM and 0.269 μM under 370 nm and 480 nm excitation wavelength lights, respectively. The detecting mechanism of hydrazine (N 2 H 4 ) by CDs–COO–F was deduced from the experimental results. Cell imaging and cytotoxicity experiments of CDs–COO–F were measured. The experiment results show that the fluorescent probe CDs–COO–F can be applied to detect hydrazine (N 2 H 4 ) in aqueous solution and living cells.
研究领域:
分析化学
·
生物医学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Shu-Hua Han,Dan-Dan Huang,Zhang-Jian Cheng,Ai-Lin Liu,Yun Lei
Most known chemiluminescence (CL) systems are flash-type that generate weak luminescence and decline quickly after dozens of seconds, while the glow-type CL systems have stable emission for an extended period to achieve accurate quantitation. In this work, a long-term CL system based on hydrazine-hydrate (N 2 H 4 ·H 2 O) modified carbon quantum dots (N-CQDs) as a luminescent probe, with K 2 S 2 O 8 and H 2 O 2 as co-reactants, was proposed. The CL emission enhanced by H 2 O 2 increased 18-fold more than that of N-CQDs and K 2 S 2 O 8 direct reaction, and decayed by 5% of the maximum intensity over 700 s. In the reaction system, K 2 S 2 O 8 and H 2 O 2 co-reactants can promote each other to continuously generate corresponding radicals (•OH, O 2 •− , 1 O 2 ), which in turn trigger the CL emission of N-CQDs. This phenomenon was identified as the primary cause for the production of persistent CL. In addition, a stable and selective CL sensor based on the N-CQDs-K 2 S 2 O 8 -H 2 O 2 CL enhancing system was developed for ascorbic acid quantitation in the linear range from 0.1 to 10.0 mM with a detection limit of 0.036 mM. The method has been applied to the analysis of tablet samples and holds potential in pharmaceutical analysis field.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Qilu Yao,Meng He,Xiaoling Hong,Xinyu Chen,Gang Feng,Zhang-Hui Lu
Hydrazine borane (N 2 H 4 BH 3 , 15.4 wt%) and hydrous hydrazine (N 2 H 4 ·H 2 O, 8 wt%) are promising chemical hydrogen storage materials that have attracted much attention in recent years due to their high gravimetric hydrogen capacities. The selective and rapid catalytic dehydrogenation of N 2 H 4 BH 3 and N 2 H 4 ·H 2 O is the key to the potential use of the abovementioned materials in hydrogen applications. In this study, a series of Rh-MoO x nanoparticles (NPs) with various metal compositions have been successfully prepared via a simple one-step chemical reduction approach in the absence of a surfactant/support at room temperature . The obtained surfactant/support-free Rh-MoO x NPs exhibit good dispersibility and small particle size. Among all of the as-prepared Rh-MoO x NPs, the optimized Rh-MoO x catalysts with a molar ratio of 1:1 show the highest catalytic properties with 100% H 2 selectivity for hydrogen evolution from aqueous N 2 H 4 BH 3 and N 2 H 4 ·H 2 O solutions at 323 K under alkaline conditions. The turnover frequency (TOF) values of Rh 0.5 (MoO x ) 0.5 NPs are 2000 and 750 h −1 for hydrogen evolution from N 2 H 4 BH 3 and N 2 H 4 ·H 2 O , respectively, which are among the highest values ever reported for Rh-based catalysts. The superior catalytic performances could be attributed to the small particles size, low crystallinity , modified electronic structure, and strong basic sites of Rh NPs induced by the MoO x dopant . The highly rapid and selective Rh-MoO x catalyst may further encourage the deployment and application of N 2 H 4 BH 3 and N 2 H 4 ·H 2 O as safe and convenient sources of hydrogen for fuel cells.
研究领域:
化学工程
·
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）