Journal of Analytical Methods in Chemistry
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2021
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IF 2.193
Hongchuan Li,Rui Jin,Hongxiang Hu,Yusef Kianpoor Kalkhajeh,Yingying Zhao,Yue Gao,Borui Zhang
Sodium alginate (SA), polyvinyl oxide (PEO), and ceramic nanomaterials were used to prepare alginate composite gel. The present study examined the removal rate and adsorption capacity of alginate composite gel for removal of wastewater As(III), Pb(II), and Zn(II). Batch experiments were conducted to study the influence of experimental parameters such as pH and temperature, as well as the mechanism of As(III), Pb(II), and Zn(II) adsorption with the new adsorbent. The results showed the high efficiency of sodium alginate composite gel for removal of wastewater As(III), Pb(II), and Zn(II). Under the condition of the best liquid-solid ratio and the contact time, the removal rates of As(III), Pb(II), and Zn(II) were 67.42%, 95.31%, and 93.96%, respectively. The pseudo-second-order kinetic equation was superior to fit the adsorption kinetics process. The isothermal adsorption models of As(III) and Pb(II) fitted well with the Freundlich model, and Zn(II) fitted well with the Langmuir model. The results of SEM, EDS, XPS, and FTIR analyses revealed that the adsorption process occurred mainly via chemisorption. The results of the present study suggest that new adsorbents can be effectively utilized for As(III), Pb(II), and Zn(II) removal from water.
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LANGMUIR
·
2019
·
IF 3.683
Qiong Ma,Yingying Zhang,Xueping Dang,Jianlin Huang,Youhong Ai,Huaixia Chen
In this work, adsorption behaviors of pyrene (PYR), fluoranthene (FLT), phenanthrene (PHE), and fluorene (FLU) on the coordination cluster [Zn5(H2Ln)6](NO3)4]·8H2O·2CH3OH (Zn5) were studied. The adsorption mechanism and spectrum analyses revealed that the synergistic effect of hydrophobic interaction, π–π stacking, and N–H···π interaction played a crucial role during the adsorption process. The maximum adsorption capacities of PYR, FLT, PHE, and FLU were 406.4, 399.7, 153.7, and 114.3 mg g–1, respectively, resulting from the Langmuir isotherm model. Quick removal of PYR and FLT was found in kinetic experiments with the adsorption equilibrium being reached within 1 min. Competitive adsorption indicated that the adsorption sites for PYR, FLT, PHE, and FLU on Zn5 were identical, and synergistic effects also existed in the adsorption process. Therefore, Zn5 has the potential to be used as an adsorbent in the field of wastewater treatment.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Xiaomeng Dou,Xiao Jiang,Wenzhi Li,Chaofeng Zhu,Qingchuan Liu,Qiang Lu,Xusheng Zheng,Hou-min Chang,Hasan Jameel
Kraft lignin depolymerization to liquid fuels with high yields is crucial to the comprehensive achievement of sustainable and economic feasibility. Herein, we prepared a bimetallic Co-Zn/Off-Al H-beta catalyst through a two-step post synthesis method composed of dealumination and metal incorporation. The bifunctional Co-Zn/Off-Al H-beta catalyst efficiently converted Kraft lignin to liquid fuels, which was attributable to the synergistic effect of Co hydrogen binding sites and Zn Lewis acid sites on H-beta support. Catalytic hydrogenation with Co:Zn = 1:3/Off-Al H-beta catalyst at 320 °C for 24 h gave the highest yield of petroleum ether soluble product (81%, mainly monomers and dimers). Under these conditions, the liquefied lignin gave a higher heating value of 33.3 MJ/kg, which is a significant increase from 26.0 MJ/kg of Kraft lignin. The catalyst stability test showed excellent recyclability. This work provides a paradigm of improving lignin depolymerization efficiency via the combined use of Lewis acid and hydrogenation catalyst.
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CERAMICS INTERNATIONAL
·
2019
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IF 3.45
Runjiang Guo,Hongdong Wang,Ran Tian,Dongliang Shi,Hua Li,Yao Li,Hezhou Liu
In this report, a novel hollow boxes shape ZnSnO 3 is synthesized via a one-pot surfactant-free method. We synthesize CNT@ZnSnO 3 hollow boxes via hydrothermal reaction by using the Zn-MOF(ZIF-8) as the Zn source at the first time. Several characterization techniques are used to investigate the structure, morphology, composition and specific surface area of CNT@ZnSnO 3 . CNT@ZnSnO 3 hollow boxes demonstrated large specific surface area (up to 45.73 m 2 /g), which is favorable for the strong gas sensor response. The ethanol sensor based on CNT@ZnSnO 3 hollow boxes exhibited high response of ethanol up to 166 at 240 °C at the concentration of 100 ppm, which is about 8 times higher than the sensing response of ZnSnO 3 nanocubes. Moreover, CNT@ZnSnO 3 hollow boxes based ethanol sensor also shows the excellent selectivity and stability. As a novel green gas sensor, CNT@ZnSnO 3 hollow boxes show the great potential in the gas sensing field.
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Nano-Micro Letters
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2019
·Vol. 11
·期 1
·1-17
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IF 9.043
Niu Qijian,Chen Binling,Guo Junxia,Nie Jun,Guo Xindong,Ma Guiping
Developing an efficient and durable oxygen reduction electrocatalyst is critical for clean-energy technology, such as fuel cells and metal–air batteries. In this study, we developed a facile strategy for the preparation of flexible, porous, and well-dispersed metal–heteroatom-doped carbon nanofibers by direct carbonization of electrospun Zn/Co-ZIFs/PAN nanofibers (Zn/Co-ZIFs/PAN). The obtained Zn/Co and N co-doped porous carbon nanofibers carbonized at 800 °C (Zn/Co–N@PCNFs-800) presented a good flexibility, a continuous porous structure, and a superior oxygen reduction reaction (ORR) catalytic activity to that of commercial 20 wt% Pt/C, in terms of its onset potential (0.98 V vs. RHE), half-wave potential (0.89 V vs. RHE), and limiting current density (− 5.26 mA cm −2 ). In addition, we tested the suitability and durability of Zn/Co–N@PCNFs-800 as the oxygen cathode for a rechargeable Zn–air battery. The prepared Zn–air batteries exhibited a higher power density (83.5 mW cm −2 ), a higher specific capacity (640.3 mAh g −1 ), an excellent reversibility, and a better cycling life than the commercial 20 wt% Pt/C + RuO 2 catalysts. This design strategy of flexible porous non-precious metal-doped ORR electrocatalysts obtained from electrospun ZIFs/polymer nanofibers could be extended to fabricate other novel, stable, and easy-to-use multi-functional electrocatalysts for clean-energy technology.
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CARBON
·
2019
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IF 7.466
Lulu Chen,Yelong Zhang,Xiangjian Liu,Ling Long,Siyu Wang,Xiaolong Xu,Minchao Liu,Wenxiu Yang,Jianbo Jia
The development of transition metal nitrides/carbon hybrids with well-organized morphology, outstanding efficiency and durability for Zn-air batteries are of great urgency. Herein, a morphology-controlled strategy to efficiently fabricate uniform Co 4 N nanoparticles anchored on N -doped carbon (Co 4 N@NC-m) is reported. The diameters and distribution of Co 4 N nanocrystals can be tuned to be homogeneous profited by abundant N sources in melamine. Moreover, thanks to the advantages of higher nitrogen doping content, better electrical conductivity , higher degree of graphitization , and larger electrochemical surface area, Co 4 N@NC-m possesses excellent oxygen reduction reaction (half-wave potential of 0.87 V) and oxygen evolution reaction (overpotential of 398 mV at 10 mA cm −2 ) activities in basic solution. The Zn-air battery fabricated with Co 4 N@NC-m owns higher open circuit voltage (1.490 V), larger power density, and better rechargeability than those of the commercial IrO 2 + 20% Pt/C catalysts, which proves the potential application in practical energy conversion devices.
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Journal of Environmental Chemical Engineering
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2019
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IF 0
Fujin Sun,Qihui Zeng,Wen Tian,Yingming Zhu,Wei Jiang
Silver oxide is a high-performance visible-light-driven nanoparticle photocatalyst. However, its high cost and difficult recovery limit its wide application. Constructing a magnetic composite is a smart strategy to effectively utilize nanoparticle photocatalysts with acceptable performance maintenance. In this study, three magnetic ferrite supports, that is, CoFe 2 O 4 , ZnFe 2 O 4 , and NiFe 2 O 4 , were used as support to load Ag 2 O and construct Ag 2 O/MFe 2 O 4 composites to lower the Ag consumption and intensify the recovery rate. The photoactivity, stability, and magnetic recovery of the three composite magnetic photocatalysts were evaluated by using four typical organics. The results of the batch experiment confirm that Ag 2 O/MFe 2 O 4 (60%) possesses a good photoactivity and stability. However, Ag 2 O/ZnFe 2 O 4 exhibits a better photoactivity and higher magnetic recovery based on cycling during the semi-continuous process. The ferrites are inert for photocatalysis process without significant effect on Ag 2 O photocatalytic performance, but increase the surface area and improve the recovery rate as magnetic composite carriers.
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APPLIED CLAY SCIENCE
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2019
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IF 3.89
Wenning Yang,Jia Li,Min Liu,Dickon H.L. Ng,Yong Liu,Xiaofan Sun,Jie Yang
Novel hierarchically porous CoAl-LDH (layered double hydroxides)/MFe 2 O 4 (Ni, Zn, Co) hybrids with excellent peroxidase-like catalytic activity , high selectivity and reusability were first fabricated by using natural cotton as a bio-template. Among them, CoAl-LDH/NiFe 2 O 4 exhibited the best intrinsic peroxidase-like property due to its 3D hierarchically porous structure with more exposed active sites, which could effectively catalyze peroxidase substrate 3,3′,5,5′- tetramethylbenzidine (TMB) in the presence of H 2 O 2 to produce typical blue color reaction. A facile and visual system for glucose detection using glucose oxidase was successfully established, which exhibited a sensitive response to glucose in the range of 25–400 μM with detection limit of 13 μM based on the hydroxyl radical originated from the decomposition of H 2 O 2 by the catalysis of CoAl-LDH/MFe 2 O 4 (Ni, Co, Zn) hybrids. This work offered an effective strategy to achieve morphology-controllable hierarchically porous materials and provided a new insight into seeking novel enzyme mimetics with enhanced catalytic activities.
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JOURNAL OF POWER SOURCES
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2019
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IF 7.467
Hu Luo,Yingming Wang,Gongwei Wang,Li Xiao,Juntao Lu,Lin Zhuang
Redox electrochemical capacitors , using soluble redox couples to utilize the “dead weight” of the electrolyte to add faradaic charge, are considered as an effective strategy to increase the energy storage capacity of the electro-chemical double-layer capacitors. In this work, we report a new aqueous dual-redox electrochemical capacitor, using Zn 2+ /Zn as the anolyte and Br 3 ˉ/Brˉ as the catholyte. The electrolyte contains 1 M ZnBr 2 , 0.1 M TPABr and 2 M Zn(OTf) 2 . The theoretical voltage gap of the two redox couples is larger than 1.7 V, which is expected to be an advantage for higher specific energy. Tetrapropyl ammonium cation (TPA + ) has been used as a complex agent to solve the Br 3 ˉ cross diffusion issue. To avoid the generation of [TPA] 2 [ZnBr 4 ] precipitation, an appropriate amount of Zn(OTf) 2 has been added to the electrolyte to adjust the Zn/Br ratio. After adding these two additives, the coulombic efficiency of the dual-redox EC has been increased from 90% to 99%, and the open-circuit voltage loss (24 h) has been dropped from 31% to 5%. The newly configured Zn/OTf/TPA/Br redox EC exhibits a specific energy of 110 W h/kg at 1 A/g, a high power density (7 kW/kg) and stable cycling over 6000 cycles.
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JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
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2019
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IF 4.178
Qin Sun,Wanchun Yang,Yihan Liu,Yufeng Li,Mingyu Li
Soda lime tempered glass was successfully joined by a Bi-B-Zn lead-free low-melting glass with a composition of 35Bi 2 O 3 -50H 3 BO 3 -15ZnO (mol%). The Bi-B-Zn glass exhibited a glass transition temperature (T g ), softening point (T d ) and crystallization temperature (T c ) of 346 ℃, 364 ℃and 448 ℃ respectively. The wettability of the glass on tempered glass substrate was investigated, and a contact angle of less than 13.94° was obtained when the temperature was raised to above 470 ℃ in open atmosphere. The microstructural evolution, interfacial bonding mechanism and mechanical properties of the joint at different joining temperatures were investigated. The diffusion bonding between Bi-B-Zn glass solder and tempered glass was achieved. The crystals of Bi 4 B 2 O 9 were detected in the joint when the joining temperature was higher than 450 ℃. The shear strength and Vickers hardness of the joint reached 35.14 ± 1.89 MPa and 191.55 ± 13.93 MPa, respectively. The effects of the fractions and size of Bi 4 B 2 O 9 on the shear strength were evaluated, and the fracture mechanism at the interface was also clarified.
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ACS Sensors
·
2019
·
IF 6.944
Zhongrun Zeng,Xian Fang,Wei Miao,Ying Liu,Thandavarayan Maiyalagan,Shun Mao
Rapid and accurate determination of disinfection byproducts (DBPs) has become an emerging need for environmental monitoring and has yet to be realized in electrochemical sensors with metal organic framework (MOF)-based materials. In this study, a highly sensitive electrochemical sensor for trichloroacetic acid (TCAA) detection based on iron(II) phthalocyanine (PcFe) and a Zn-based metal organic framework (ZIF-8) composite is fabricated. As an electrode material, ZIF-8 possesses a large surface area and porous structure, which exhibits high absorbability; meanwhile, PcFe (II), as the sensing element, undergoes a reduction process from PcFe (II) to PcFe (I) during the sensing process. In the presence of TCAA, PcFe (I) is reoxidized by TCAA, which shifts the reaction equilibrium and accelerates the electron transfer on the electrode interface. By analyzing the reduction current of PcFe (II), the quantitative detection of TCAA is realized. The sensor shows a limit of detection (LOD) of 1.89 nM, which is superior to other reported TCAA sensors, as well as a high sensitivity (826 μΑ/μM). Moreover, the good selectivity and stability of this sensing platform demonstrate its capability and promise in determination of trace DBPs. The reported sensor provides a new strategy for electrochemical detection of DBPs and could expand the applications of MOFs in emerging technologies for monitoring contaminants.
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ELECTROCHIMICA ACTA
·
2018
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IF 5.116
Zhongliang Deng,Qingfeng Yi,Guang Li,Yao Chen,Xiaokun Yang,Huidong Nie
One of the major challenges towards the development of the conventional alkaline Zn-air battery is its spontaneous discharge caused by the unstability of the anode Zn in concentrated alkaline electrolyte . Utilization of a neutral electrolyte as the alternative to alkaline electrolyte is likely to be a promising strategy to overcome this issue because of much high stability of anode Zn in neutral solution. To realize the normal operation of the neutral Zn-air battery however, a crucial issue is how to ensure that the cathodic catalyst can efficiently electro-catalyze oxygen reduction reaction (ORR) in neutral solution. Herein, we report a facile preparation of Ni/Co-doped C-N nano-composite catalysts (NiCo/C-N) from direct pyrolysis of Ni/Co salt, polyaniline (PANI), carbon nanotube (CNT) and dicyandiamide. Among the as-synthesized catalysts, Ni 1 Co 3 /CN-3 presents high and stable ORR current density of 5.27 mA cm −2 in 0.5 mol L −1 KNO 3 solution at 2000 rpm. Electron transfer number of ORR on Ni 1 Co 3 /CN-3 catalyst is 3.78, showing a nearly completed reduction of O 2 to H 2 O. A neutral Zn-air battery with the prepared NiCo/C-N composite coated on carbon paper as the air electrode catalyst and metal Zn as the anode was constructed in 0.5 mol L −1 KNO 3 solution. For the catalyst Ni 1 Co 3 /CN-3, the open circuit voltage of the neutral Zn-air battery is 1.16 V, and the maximum power density is 38.5 mW cm −2 . The galvanostatic discharge time is 345.7, 160.6, 18.1 and 1.3 h as the discharge current density keeps 10, 50, 100 and 150 mA cm −2 respectively. A stable voltage plateau arises at various discharge current densities. The neutral Zn-air battery can repeatedly discharge after the zinc anode has been replaced, indicating that the synthesized ORR catalyst is an excellent cathode material for the neutral Zn-air battery. This kind of neutral Zn-air battery has a wide application prospect as mobile power supply.
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