CHEMISTRY-A EUROPEAN JOURNAL
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2021
·Vol. 27
·期 21
·6538-6544
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IF 5.236
Yi Huang,Le Gao,HaoHai Yu,Zhihua Yang,Junjie Li,Shilie Pan
Graphical Laser damage limitation : Promising ternary infrared nonlinear optical (NLO) materials, Na 6 MQ 4 (M=Zn, Cd; Q=S, Se), with unique [NaQ 4 ] NLO-active groups, are successfully prepared. Theoretical calculations and statistical analyses indicate that the second-harmonic generation effect and band gap in the compounds originate mainly from the distorted NaQ 4 NLO-active units with a short Na−S bond length. Four sodium-based ternary IR nonlinear optical (NLO) materials, Na 6 MQ 4 (M=Zn, Cd; Q=S, Se), were prepared through a high-temperature flux method. The crystal structure of the compounds is built up of isolated [MQ 4 ] tetrahedra and a 3D framework formed by the NaQ n ( n =4, 5) units. The two selenides, Na 6 MSe 4 (M=Zn, Cd), as promising IR NLO materials, show moderate second-harmonic generation (SHG) responses (0.9 and 0.5×AgGaS 2 ) with good phase-matching behavior, as well as high laser damage thresholds (2 and 1.9×AgGaS 2 ). The two sulfides, Na 6 MS 4 (M=Zn, Cd), exhibit higher laser damage thresholds (13 and 4×AgGaS 2 ), but smaller SHG responses (0.3 and 0.2×AgGaS 2 ). Theoretical calculations and statistical analyses indicate that the SHG effect and band gap in the compounds originate mainly from the distorted NaQ 4 NLO-active units with a short Na−S bond length, which provides a new insight into the design of novel IR NLO materials.
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SOLID STATE IONICS
·
2021
·
IF 3.785
Fengjiao Guo,Song Gao,Chenchen Ji,Hongyu Mi,Han Li,Wentao Zhang,Huan Pang
Flexible aqueous Zn-ion batteries have aroused great interest as an emerging energy storage technology in smart/wearable electronics due to their low cost, high energy density , good safety, and flexibility. However, the construction of excellent cathode and anode is still a key step for the Zn-ion batteries development. Herein, we report a rechargeable flexible quasi-solid-state (FQSS) Zn-ion battery assembled with free-binder polyaniline/molecular-decorated carbon cloth (PANI/mCC) cathode and zinc nanosheet/CC (Zn/CC) anode sandwiched by poly(vinyl alcohol)/Zn(CF 3 SO 3 ) 2 gel electrolyte. The nanostructured PANI arrays and Zn sheets oriented on the flexible substrates afford rapid transport channels for electrolyte ions and endow electrodes enough flexibility. Consequently, the constructed FQSS Zn-ion battery exhibits outstanding energy/power densities of 185.7 Wh kg −1 /9742 W kg −1 and good capacity retention of 80% after 1000 charge-discharge cycles at 3.3 C. Impressively, the assembled flexible device can accommodate a series of bending states and show stable performance.
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MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Tengyan Wu,Guokang Shen,Feng Ding,Duxin Li,Hongbin Zhong
In this study, the La doped Mn–Zn nanoferrites were synthesized through hydrothermal method , and then were used to activate persulfate for degrading azo dye the Direct Blue 15 (DB15). The structure and morphology of the as-prepared sample were characterized by X-ray Diffraction (XRD), Fourier Transformed Infrared Spectrometer (FTIR), Transmission Electron Microscopy (TEM) and Energy Dispersive Spectrometer (EDS). The results indicated that the La doped Mn–Zn ferrite was successfully synthesized in this study. Four absorption bands were observed in FTIR spectra and assigned to the corresponding site bonds. Mn 0.6 Zn 0.4 La x Fe 2- x O 4 was chosen as catalysts to activate persulfate (PS/Mn 0.6 Zn 0.4 La x Fe 2- x O 4 ) to decolorize the DB15. It was found that the DB15 was degraded effectively by PS/Mn 0.6 Zn 0.4 La x Fe 2- x O 4 systems. Furthermore, the influences of synthesized conditions (such as the temperature, holding time and doping content of La) of Mn 0.6 Zn 0.4 La x Fe 2- x O 4 on the DB15 decolorization were analyzed. The results indicated that the doping of La can significantly improve the DB15 degradation, 100% degradation of DB15 can be obtained by PS/Mn 0.6 Zn 0.4 La 0.09 Fe 1.91 O 4 within 15 min. The enhancement of synthesized holding time of Mn 0.6 Zn 0.4 La x Fe 2- x O 4 at 160 °C can also increase the DB15 decolorization, and the degradation rate of the DB15 reached almost 100% within 25 min when using Mn 0.6 Zn 0.4 La 0.05 Fe 1.95 O 4 synthesized at 160 °C for 13 h as catalyst.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2020
·
IF 2.717
Wentao Hu,Xi'an Fan,Zigui Luo,Fan Luo,Guangqiang Li,Jian Wang
In this work, Fe/ZnO soft magnetic composite (SMC) is prepared successfully by sol-gel method combined with a pyrolysis process. Formation mechanism and effect of annealing on magnetic properties for the Fe/ZnO SMCs are studied in detail. The results show that Fe/zinc acetate hydrogel mixture will be decomposed into the Fe/ZnO composites by heating above 340 °C. And ZnO is well coated on the surfaces of Fe particles. The Fe/ZnO composite compact has lower total core loss and better frequency stability of magnetic permeability compared with pure Fe compact. In addition, annealing treatment shows an enhanced effect on the magnetic properties for the Fe/ZnO composite compact such as reduced coercivity and increased permeability. The annealed Fe/ZnO SMCs can keep stable magnetic permeability (26) from 50 Hz to 10 kHz, high magnetic induction (1.65 T) and a relatively low core loss of 91.11 kW/m 3 measured under a magnetic flux density of 30 mT at 10 kHz. Therefore, the Fe/ZnO soft magnetic composites prepared by the above-mentioned method provide a great potential application in electromagnetic conversion equipment.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 12
·9057-9064
·
IF 2.22
Zhao Jingkui,Liu Xiansong,Kan Xucai,Chen Zuhua,Liu Chaocheng,Wang Wei,Lv Qingrong,Huang Jingwen,Shazeda Mudssir
In this study, novel Ni–Cu–Zn ferrites with the chemical formula [Ni 0.6 Zn 0.4 ][Cu 0.2 Co x Fe 1.8− x ]O 4 ( x = 0, 0.05, 0.10, 0.15, 0.20, 0.25) doped with Co 2+ ions were designed and manufactured by standard solid-state reaction method. The magnetic properties, surface characteristics, and ion occupancy of ferrites were studied by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM), and we explained the different mechanisms of the results and the relationship between magnetic properties and microstructures. For the obtained samples, cobalt ions entered the lattice, and all samples were characterized as spinel structures. As the doping amount of Co 2+ ions increases, the lattice constant and volume of the sample also increases. With an appropriate doping level, Co 2+ ions-doped Ni–Cu–Zn ferrites can maintain higher saturation magnetization, higher magnetic permeability, and lower hysteresis loss. When x ≤ 0.1, the saturation magnetization M s increases significantly as the doping amount of Co 2+ ions increases, but when x > 0.1, the value decreases. The experimental results show that the saturation magnetization value is 118.08 emu/g, the magnetic permeability value is 39.47 H/m, and the hysteresis loss is 1.192 mW/cm 3 at an optimum doping amount. Therefore, the sample achieves the best magnetic properties when the doping amount is 0.1.
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FUEL
·
2021
·
IF 6.609
Chengming Huang,Dingmei Han,Linjie Guan,Linhua Zhu,Yi Mei,Dedong He,Yun Zu
Propane dehydrogenation (PDH) is a prospective benign process for the production of propylene, but generally depends on high-price Pt and toxic Cr(VI) catalysts that often suffer from the rapid deactivation derived from metal sintering and severe coke deposition. To overcome these problems, the breakthroughs in an alternative catalyst design with efficient, low-cost and eco-friendly play a crucial role in successfully developing this process. Here, we facilely fabricate the bimetallic-site catalyst of Ni-Zn anchored in the zeolitic framework of silicalite-1 (depicted as NiZn-S-1) by employing ligand-protected strategy, which performs high temperature stability. Under comparable conditions, the NiZn-S-1 catalyst with high Ni/Zn molar ratio of 3:1 (named 0.2Ni0.06Zn-S-1) exhibits superior catalytic activity (initial propane conversion of 32.5 % and actual TOF propane of 28.5 min −1 ) with low deactivation rate (0.0778 h −1 ) and great propylene selectivity (>90%) after 30 h on stream. In particular, the catalytic performance on this catalyst almost keeps same as that of fresh catalyst after 4 successive oxidation–reduction cycles. Multiple characterizations further demonstrate that the enhancement of PDH performance ought to be attributed to the synergistic effect between bimetallic Ni-Zn sites, which favors the selective activation of C–H bond and propylene desorption to reduce the formation of coke species with high graphitization degree, boosting the improvement of catalyst stability. The design of novel bimetallic-sites catalyst can give a new idea on the development of alternative PDH catalysts with economical- and environment-friendly in the future.
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IONICS
·
2021
·Vol. 27
·期 10
·4429-4437
·
IF 2.817
Wang Jing,Liu Xue-An,Zhang Dashui,Tong Zhangfa,Ji Hongbing,Qu Hui-Ying
The popularity of intelligent electronic products demands suitable smart electrodes with high specific capacitance, superior durability, and intrinsic safety. Herein, a bifunctional titanium dioxide (TiO 2 ) electrode with electrochromic energy storage in the Zn-ion aqueous electrolyte was demonstrated. The color of the electrode can be changed according to its charging state by Zn 2+ intercalation/de-intercalation, to realize the noticeable judgment and prediction of the energy contained. Direct growth of TiO 2 by the hydrothermal method effectively increases the bonding force between the active TiO 2 material and the substrate. Electrochemical results show that the TiO 2 electrode has high specific capacitance of 139.8 mF·cm −2 at 1.5 mA·cm −2 , and retains 93% of the initial areal specific capacitance after 100 CV cycles. In addition, it exhibits high transmittance contrast of 45% at a wavelength of 980 nm in the near-infrared region, short bleaching time (6.5 s) and coloration time (18.0 s) at an alternating potential between 0 and − 1.1 V. These superior electrochemical and electrochromic performances can be attributed to the fast Zn 2+ diffusion facilitated by the porous structure and short ion diffusion distance of the TiO 2 electrode.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Kun Jiang,Kun Liu,Qian Peng,Muyang Zhou
Montmorillonite (MMT) and humus have a good adsorption effect on heavy metal ions . This study proposed a synthetic method for a novel composite of humus-like substances/MMT (HLS-MMT) by introducing humus precursors into the interlayer domain of MMT and then forming HLS through in situ catalytic polycondensation reaction. The structure and morphology of samples were characterized by XRD , FTIR, and SEM , which demonstrated the successful loading of HLS on the internal and external surfaces of MMT. The experimental results showed that the loading of HLS on MMT was very stable, and the adsorption capacity of the modified MMT for lead and zinc ions was greatly enhanced. The effects of single-factor experiments showed that the pH value was the key factor affecting the adsorption process . In addition, the adsorption process was found to be in good agreement with the Langmuir isotherm model and the pseudo-second-order kinetic model . The competitive adsorption experiment displayed that HLS-MMT had a higher affinity for Pb ions than Zn ions, and the cycling experiment presented that the adsorbent had good regeneration and cycling performance. This study shows that HLS-MMT is a novel adsorbent with a good capacity to separate and enrich Pb and Zn ions similar to ion-exchange resin.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Huizhen Lv,Yu Song,Zengming Qin,Mingyue Zhang,Duo Yang,Qing Pan,Zhihui Wang,Xinjian Mu,Jianming Meng,Xiaoqi Sun,Xiao-Xia Liu
The disproportionation of the Jahn-Teller (J-T) active manganese oxides (Mn 3+ ) often leads to uncontrollable Mn 2+ dissolution, which has been identified as one of the major causes of the performance degradation in conventional Zn-MnO 2 batteries. Herein, we use the “unwanted” disproportionation of the Mn 3+ cations to realize effective MnO 2 /Mn 2+ transformation, achieving high specific capacity (550 mAh g −1 ) and good cycling stability (5000 cycles without capacity decay) in a Zn-MnO 2 hybrid battery with mild aqueous electrolytes. Mechanism study shows that MnO 2 is deposited on the cathode during charging, H + /Zn 2+ insertion and disproportionation occur sequentially during discharging, leading to Mn 2+ dissolution. The generated high-valence manganese oxides via disproportionation further experience reduction-disproportionation-dissolution, which proceeds repeatedly in the expanded discharge potential to 0 V vs. Zn 2+ /Zn, resulting in the complete dissolution of the cathodic materials. Our results provide the fundamental understanding on the controversial mechanisms of Zn-MnO 2 batteries with mild aqueous electrolytes and highlight the effect of disproportionation in pushing the electrochemical performance of the promising Zn-MnO 2 hybrid batteries.
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2019
·Vol. 103
·期 6
·802-807
·
IF 1.65
Du Jingjing,Guo Ruilin,Li Ke,Ma Bingbing,Chen Yan,Lv Yanna
In this work, we assessed the toxic effects of ZnO nanoparticles (NPs; 1, 10, and 50 mg L −1 ) and the corresponding dissoluble Zn ions (0.71, 8.66, and 35.59 mg L −1 ) on Microcystis aeruginosa . After chronic exposure (28 days), significantly higher growth inhibition was observed under ZnO NPs at 1 mg L −1 (47%) than under Zn ions at 0.71 mg L −1 (−15%). The opposite effect pattern was observed for ZnO NPs at 10 (71% vs. 80%) and 50 mg L −1 (73% vs. 95%) compared to Zn ions at the corresponding concentrations. After 7 days of exposure, ZnO NPs at 10 and 50 mg L −1 led to an increase of 83 and 53% in malondialdehyde content, as well as an increase of 106 and 61% in superoxide dismutase activity, respectively. However, Zn ions at the corresponding concentrations showed negligible impacts on the two parameters. The different results indicate that the insoluble NPs during the initial exposure mostly account for lipid peroxidation, which further lead to microalgal antioxidant response. During the subsequent exposure, the contributors of ZnO NP toxicity shift with the concentration and exposure time of ZnO NPs. In conclusion, the study presents new insights into the different contributions of insoluble NPs and dissoluble metallic ions to metallic NP toxicity.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 6
·2303-2311
·
IF 3.288
Ning Jiang,Hongchao Geng,Yan Qiao,Xingqi Zhu,Chenyi Li,Qingyun Cai
A visible-light-active CuInSe2:Zn/g-C3N4/TiO2 nanowire (NW) photoelectrode was prepared by in situ growth of g-C3N4 on the surface of TiO2 NWs, followed by drop deposition of Zn-doped CuInSe2 quantum dots (CuInSe2:Zn QDs). It has a 2.205 eV band gap and can absorb visible light. The as-prepared ternary hybrid nanocomposite CuInSe2:Zn/g-C3N4/TiO2 NWs shows high photon absorption and photocurrent generation efficiency, as well as a high bactericidal effect on Staphylococcus aureus.
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MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Tiantian Kang,Haoping Wang,Xiaoju Wang,Liheng Feng
A simple fluorescent probe comprised of coumarin and quinoline units was designed and synthesized through acylhydrazine bonding mode. On account of the “push-pull” structure, the probe exhibits high selectivity and sensitivity for Zn(II) with an obvious red-shift of fluorescence and a visible color change. The detection of Zn(II) by the probe is almost free from interference of other ions and reversible based on intramolecular charge transfer process. Three five-membered rings of the probe with Zn(II) were formed and verified by MS and 1 H NMR spectra. Notably, as a simple, fast and environmentally friendly device, detection of ions by test paper has great practicality, the probe could be designed as test papers for detecting Zn(II) taking advantage of the color change character under 365 nm UV lamps.
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