TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2023
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IF 4.5
Jun-lian WANG,Lu LIU,Guo-dong XU,Pei-long WANG,Guo-yong HUANG,Feng-shan YU
To seek more efficient extractant for Pd recovery from leaching solution of spent automotive catalysts, a new compound N-methyl-N-isopropyl octanthioamide (TA-813) was synthesized and characterized through FT-IR, 1 H NMR, ESI-MS and elemental analysis. Its extraction and stripping behaviors for Pd were studied. To evaluate its reusability performance, extraction−stripping cycles were carried out. Finally, TA-813 was applied to separating Pd from simulated leaching solution of spent automotive catalysts. TA-813 shows fast extraction kinetics, high extraction efficiency and specific selectivity for Pd. During extraction two TA-813 molecules coordinate with one Pd. The loaded Pd in the organic phase is efficiently stripped by neutral and acidic thiourea solutions. TA-813 shows no loss in activity after eight extraction−stripping cycles. Even from simulated leaching solution of spent automotive catalysts, in which the concentrations of some purities (La, Ce, Mg, Al) are much higher than that of Pd, Pd is still selectively extracted.
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高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Dufen Hu,Baoyang Lu,Kaixin Zhang,Xiaoxia Sun,Jingkun Xu,Xuemin Duan,Liqi Dong,Hui Sun,Xiaofei Zhu,Shijie Zhen
Two amino-functionalized chiral poly(3,4-ethylenedioxythiophene) (PEDOT) derivatives, poly( N -( tert -butoxycarbonyl)-L-phenylalayl (3,4-ethylenedioxythiophene-2'-yl)methylamide) (PEDOT-Boc-Phe) and poly(L-phenylalayl (3,4-ethylenedioxythiophene-2'-yl)methylamide) (PEDOT-Phe), were synthesized electrochemically via potentiostatic polymerization of corresponding monomers N -( tert -butoxycarbonyl)-L-phenylalayl (3,4-ethylenedioxythiophene-2'-yl)methylamide (EDOT-Boc-Phe) and L-phenylalayl (3,4-ethylenedioxythiophene-2'-yl)methylamide (EDOT-Phe). The electrochemical behavior, structural characterization, spectroscopic properties, and surface morphology of two chiral conducting polymer films were systematically explored. They displayed excellent reversible redox activities, and rough and compact surface. Importantly, PEDOT-Boc-Phe and PEDOT-Phe modified electrodes were used to identify 3,4-dihydroxyphenylalanine (DOPA) enantiomers by square wave voltammetry (SWV) in sulphuric acid solution. It is interesting that the SWV peak currents of enantiomers were found to be quite different and hence the enantiomers could be successfully recognized but the enantioselectivity was not observed using the common method of cyclic voltammetry (CV). Satisfactory results implied that the obtained polymer films could play crucial roles in the development of practical value and analytical application prospects.
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CHINESE JOURNAL OF CATALYSIS
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2023
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IF 16.5
Hongfang Wang,Leitao Xu,Jingcheng Wu,Peng Zhou,Shasha Tao,Yuxuan Lu,Xianwen Wu,Shuangyin Wang,Yuqin Zou
5-Hydroxymethylfurfural (HMF) electrooxidation in neutral conditions is a promising strategy to suppress the formation of humins and corrosive effects on electrochemical devices. However, scarce studies have been reported in neutral media due to the deficiency in electrophilic oxygen (eg OH – ) required for the activation of HMF. Herein, 2,2,6,6-tetramethyl-piperidine-1-oxyl (TEMPO)/Co 3 O 4 was utilized to co-catalyze HMF in neutral media, successfully achieving 2,5-furandicarboxylic acid (FDCA) with yield > 99%. It was found that TEMPO could promote HMF dehydrogenation to 2,5-diformylfuran (DFF) and simultaneously activated water via hydrogen-bonding interactions. As a result, the formation of OH* in neutral electrolytes was favored, which was absorbed by electrogenerated active Co species to facilitate subsequent conversion of formyl-group-involved intermediates to FDCA. This work provides a current understanding of the catalytic mechanism for HMFOR in neutral media and guides the design of highly efficient electrocatalysts for biomass upgrading.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2018
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IF 0.824
Lian-Ming ZHANG,Dong-You ZHANG,Ying ZENG,Jian-Ping LI
A novel strategy based on DNA induced conformation change was developed by rendering the imprinting cavity with refined structure in order to further improve the selectivity of molecular imprinting membrane. The double-stranded DNA (dsDNA) were first self-assembled on the surface of the gold electrode, then cimaterol (CIM) molecule, taken as the representative target, would bind with the groove of dsDNA to form complex template, together with which the molecular imprinting polymers (MIPs) was prepared by electropolymerization in the monomer solution. After the elution of CIM, the obtained MIPs sensor had a remarkably high selectivity toward CIM. The combination process of CIM and DNA was studied by UV-Vis spectroscopy and was found to follow the groove combination model. The optimal conditions of the system were optimized by electrochemical method. The results showed that the sensor had the best recognition ability toward CIM when the elution time was 35 min by ethanol-acetic acid (8:1, V/V ) as an eluent and rebound time was 45 min. This sensor exhibited a linear detection range of 1.0 × 10 −13 −1.0 × 10 −10 M with a detection limit of 3.2 × 10 −14 M. The sensor was successfully applied for detection of CIM in pork samples.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2019
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IF 0.931
Hong-Ying LIU,Lang-Lang ZHU,Zhi-Heng HUANG,Yu-Bing QIU,Han-Xiao XU,Jia-Jun WEN,Wei-Wei XIONG,Li-Hua LI,Chun-Chuan GU
An electrochemical sensor was successfully fabricated by coupled ammoniated modification with PBS activation on glassy carbon electrodes (CA-GCE) and characterized by electrochemical impedance spectra. The CA-GCE showed outstanding electrochemical performance, and was applied to simultaneous detection of resorcinol (RC), catechol (CC) and hydroquinone (HQ), which could be ascribed to new active sites by the introduction of amino and oxygen-containing groups and H-bonds formed between hydroxyl groups of RC, CC, and HQ with amine, hydroxyl and carboxyl groups of CA-GCE. The reaction kinetics of RC, CC, and HQ and their reaction on CA-GCE were studied. Experimental results showed that the electrochemical reaction was adsorption controlled. Under the optimal conditions, the linear detection ranges for RC, CC, and HQ were 5–200 μM, 10–300 μM, and 1–300 μM, respectively, with their detection limits of 0.47, 0.23 and 0.46 μM, respectively. Interference and repeatability was further investigated. This strategy opened a new horizon for qualitative and quantitative detection of dihydroxy benzene.
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CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Haiqiang Zhao,Weihong Qi,Xinfeng Zhou,Haofei Wu,Yejun Li
Platinum and palladium (PtPd) alloy nanoparticles (NPs) are excellent catalysts for direct methanol fuel cells. In this study, we developed PtPd alloy NPs through the co-reduction of K 2 PtCl 4 and Na 2 PdCl 4 in a polyol synthesis environment. During the reaction, the feed molar ratio of the two precursors was carried over to the final products, which have a narrow size distribution with a mean size of approximately 4 nm. The catalytic activity for methanol oxidation reactions possible depends closely on the composition of as-prepared PtPd alloy NPs, and the NPs with a Pt atomic percentage of approximately 75% result in higher activity and stability with a mass specific activity that is 7 times greater than that of commercial Pt/C catalysts. The results indicate that through composition control, PtPd alloy NPs can improve the effectiveness of catalytic performance.
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Journal of Integrative Agriculture
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2018
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IF 1.042
Zhen-gang LIU,Huan-huan WANG,Chao-bin XUE
Laccase (EC 1.10.3.2) is known to oxidize various aromatic and nonaromatic compounds via a radical-catalyzed reaction, which generally includes two types of laccase, Lac1 and Lac2. Lac1 oxidizes toxic compounds in the diet, and Lac2 is known to play an important role in melanizing the insect exoskeleton. In this study, we cloned and sequenced the cDNA of the diamondback moth, Plutella xylostella Lac2 ( PxLac2 ), from the third instar larvae using polymerase chain reaction (PCR) and rapid amplification of cDNA ends techniques. The results showed that the full-length PxLac2 cDNA was 1 944 bp long and had an open reading frame of 1 794 bp. PxLac2 encoded a protein with 597 amino acids and had a molecular weight of 66.09 kDa. Moreover, we determined the expression levels of PxLac2 in different stages by quantitative PCR (qPCR). The results indicated that PxLac2 was expressed differently in different stages. We observed the highest expression level in pupae and the lowest expression level in fourth instar larvae. We also investigated the enzymatic properties of laccase, which had optimal activity at pH 3.0 and at 35°C. Under these optimal conditions, laccase had a Michaelis constant ( K m ) of 0.97 mmol L −1 , maximal reaction speed ( V m ) of 56.82 U mL −1 , and activation energy ( E a ) of 17.36 kJ mol −1 to oxidize 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid ammonium salt). Type II copper enhanced laccase activity below 0.8 mmol L −1 and reduced enzyme activity above 0.8 mmol L −1 with an IC 50 concentration of 1.26 mmol L −1 . This study provides insights into the biological function of laccase.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Shafaq Sahar,Akif Zeb,Yanan Liu,Naseeb Ullah,Anwu Xu
We prepared the Fe 3 O 4 /g-C 3 N 4 nanoparticles (NPs) through a simple electrostatic self-assembly method with a 3:97 weight ratio to investigate their Fenton , photo-Fenton and oxidative functionalities besides photocatalytic functionality. We observed an improvement of the Fenton and photo-Fenton activities of the Fe 3 O 4 /g-C 3 N 4 nanocomposites . This improvement was attributed to efficient charge transfer between Fe 3 O 4 and g-C 3 N 4 at the heterojunctions, inhibition of electron-hole recombination, a high surface area, and stabilization of Fe 3 O 4 against leaching by the hydrophobic g-C 3 N 4 . The obtained NPs showed a higher degradation potential for rhodamine B (RhB) dye than those of Fe 3 O 4 and g-C 3 N 4 . As compared to photocatalysis , the efficiency of RhB degradation in the Fenton and photo-Fenton reactions was increased by 20% and 90%, respectively. Additionally, the horseradish peroxidase (HRP) activity of the prepared nanomaterials was studied with 3,3,5,5-tetramethylbenzidinedihydrochloride (TMB) as a substrate. Dopamine oxidation was also examined. Results indicate that Fe 3 O 4 /g–C 3 N 4 nanocomposites offers more efficient degradation of RhB dye in a photo-Fenton system compared with regular photocatalytic degradation, which requires a long time. Our study also confirmed that Fe 3 O 4 /g-C 3 N 4 nanocomposites can be used as a potential material for mimicking HRP owing to its high affinity for TMB. These findings suggest good potential for applications in biosensing and as a catalyst in oxidation reactions.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2018
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IF 0.824
Bo-Wen TIAN,Fei FENG,Bin ZHAO,Fan LUO,Xue-Lei YANG,Hai-Mei ZHOU,Xin-Xin LI
A monolithic micro gas chromatography (μGC) chip which integrated the micro separation column (μSC) and the micro thermal conductivity detector (μTCD) based on MEMS (Micro-electro-mechanical systems) technique was fabricated. Compared to the state of the art, the μSC with high depth-to-width ratio channels that was coated with mesoporous silica nanoparticles as stationary phase could effectively improve the column capacity and separation performance. Besides, the stable suspending μTCD, which was designed and fabricated in two ports of the μGC chip, could availably enhance the thermal isolation and reliability of the device. The mixture of light hydrocarbons (methane, ethane, propane and butane) could be separated from each other and detected by this monolithic integrated μGC chip, in which the overall analysis and detection time was only 33 seconds, the separation resolution of ethane and propane was 8.34, and the number of theoretical plate was as high as 11420. The monolithic integrated μGC chip has many advantages such as good separation resolution, high column efficiency and short analysis time, and is suitable for portable gas chromatographic field and onsite detection.
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CHINESE JOURNAL OF CATALYSIS
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2019
·
IF 4.914
Guodong Chen,Jian Du,Xilong Wang,Xiaoyue Shi,Zonghua Wang,Han-Pu Liang
ABSTRACT The development of highly efficient and cost-effective electrode materials for catalyzing the oxygen evolution reaction (OER) is crucial for water splitting technology. The increase in the number of active sites by tuning the morphology and structure and the enhancement of the reactivity of active sites by the incorporation of other components are the two main strategies for the enhancement of their catalytic performance. In this study, by combining these two strategies, a unique three-dimensional nanoporous Fe-Co oxyhydroxide layer coated on the carbon cloth (3D-FeCoOOH/CC) was successfully synthesized by in situ electro-oxidation methods, and directly used as a working electrode. The electrode, 3D-FeCoOOH/CC, was obtained by the Fe doping process in (NH 4 ) 2 Fe(SO 4 ) 2 , followed by continuous in situ electro-oxidization in alkaline medium of “micro go chess piece” arrays on the carbon cloth (MCPAs/CC). Micro characterizations illustrated that the go pieces of MCPAs/CC were completely converted into a thin conformal coating on the carbon cloth fibers. The electrochemical test results showed that the as-synthesized 3D-FeCoOOH/CC exhibited enhanced activity for OER with a low overpotential of 259 mV, at a current density of 10 mA cm –2 , and a small Tafel slope of 34.9 mV dec –1 , as well as superior stability in 1.0 mol L –1 KOH solution. The extensive analysis revealed that the improved electrochemical surface area, conductivity, Fe-Co bimetallic composition, and the unique 3D porous structure together contributed to the enhanced OER activity of 3D-FeCoOOH/CC. Furthermore, the synthetic strategy applied in this study could be extended to fabricate a series of Co-based electrode materials with the dopant of other transition elements.
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CHINESE JOURNAL OF CATALYSIS
·
2025
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IF 17.7
Yang Zhang,Nengneng Xu,Bingbing Gong,Xiaoxiao Ye,Yi Yang,Zhaodi Wang,Biyan Zhuang,Min Wang,Woochul Yang,Guicheng Liu,Joong Kee Lee,Jinli Qiao
Storing solar energy in battery systems is crucial to achieving a green and sustainable society. However, the efficient development of photo-enhanced zinc-air batteries (ZABs) is limited by the rapid recombination of photogenerated carriers on the photocathode. In this work, the visible-light-driven CoS 2 /CuS@CNT-C 3 N 4 photocatalyst with unique petal-like layer structure was designed and developed, which can be used as air electrode for visible-light-driven ZABs. The superior performance of ZABs assembled by CoS 2 /CuS@CNT-C 3 N 4 was mainly attributed to the successful construction of Schottky heterojunction between g-C 3 N 4 and carbon nanotubes (CNTs), which accelerates the transfer of electrons from g-C 3 N 4 to CoS 2 /CuS cocatalysts, improves the carrier separation ability, and extends the carrier lifetime. Thereinto, the visible-driven ZABs assembled by CoS 2 /CuS@CNT-C 3 N 4 photocatalyst has a power density of 588.90 mW cm –2 and a charge-discharge cycle of 643 h under visible light irradiation, which is the highest performance ever reported for photo-enhanced ZABs. More importantly, the charge-discharge voltage drop of ZABs was only 0.54 V under visible light irradiation, which is significantly lower than the voltage drop (0.94 V) in the dark. This study provides a new idea for designing efficient and stable visible-light-driven ZABs cathode catalysts.
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Smart Materials and Structures
·
2015
·Vol. 24
·期 7
·075001
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IF 2.502
Qingsong He,Linlin Song,Min Yu,ZhenDong Dai
We develop an ionic polymer metal-carbon nanotube composite (IPMCC) actuator composed of a multiwalled carbon nanotube (MWCNT)/Nafion membrane sandwiched between two hybrid electrodes, composed of palladium, platinum and MWCNTs. The surface morphology and cross-sectional structure of the metal-carbon nanotube hybrid electrode were observed using scanning electron microscopy (SEM). SEM investigation indicated that the MWCNT layer can adhere very well with the platinum–palladium metal electrode, fill the cracks in the metal surface, and prevent the oxidation of nanoscale platinum particles. These observations show that the surface resistance of the total electrode is retained and the stability of electrode property is maintained. The displacement, blocking force and nonlinear current versus voltage (V–I) characteristics were measured. Compared with an ionic polymer metal composite (IPMC), the IPMCC shows a more stable displacement and blocking force under 1, 1.2 and 2 V at 0.1 Hz, and 2.34–3.29 times higher effective air-operating time under 3 V at 0.1 Hz. It can be observed from the V–I characteristics that the change in shape becomes significant at amplitudes higher than 1.2 V. An equivalent circuit is used to model the nonlinear behavior of the IPMCC, in which the leakage current was taken into account and analyzed. The values of the components in the circuit are estimated and electrical behavior is simulated by using the Pspice software. Compared with the model with no consideration of the leakage current, the simulations obtained by the model considering leakage current showed better agreement with the experimental results. The impressive leakage current (20 mA), which is successfully simulated by the proposed model with the nonlinear circuit, is shown to play an important role in the total current.
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