APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Li Zhang,Xuerui Yang,Runsheng Zhou,Sen Lin,Lei Zhou
In this study, Ni/Co layered double hydroxide (Ni/Co-LDH) with uniform flake structure was synthesized successfully as an effective activator in the carbamazepine (CBZ) degradation by peroxymonosulfate (PMS). Our results indicated that Ni/Co-LDH possessed a high specific surface area (72.9942 m 2 /g) and exhibited great activation performance, in which 100% CBZ removal could be achieved within 300 s under neutral conditions with 5 mg/L Ni/Co-LDH and 0.3 mmol/L PMS. In addition, the crystal structure and morphology of the prepared Ni/Co-LDH kept unchanged during degradation cycles. X-ray photoelectron spectroscopy (XPS) analysis and free radical identification experiment speculated that the cycle of Ni 2+ /Ni 3+ and Co 2+ /Co 3+ on Ni/Co-LDH surface were responsible for efficient HO•/SO 4 •− generation from PMS. Based on identified products through high resolution mass spectrometry (HR-MS), it was proposed that the degradation pathway of CBZ was a heterozygous process involving deamidation, hydroxylation and electron transfer. The ECOSAR calculation results indicated the toxicity of some products was still at very toxic level, thus certain attention should be paid to the toxicity of intermediates in the process of treating pollutants in water.
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Polymers
·
2021
·Vol. 13
·期 20
·3493
·
IF 4.329
Zhang Chen,Ting Yang,Lin Cheng,Jianxin Mu
First, nickel particles were deposited on the surface of graphite nanoplatelets to fabricate highly conductive GnPs@Ni core-shell structure hybrid fillers via electroplating. The modified GnPs were blended with polyphenylene sulfone via the solution blending method, followed by the hot-pressing method to achieve high thermally conducting GnPs@Ni/PPSU composites for high performance electromagnetic interference effectiveness. The results showed that in-plane and through-plane thermal conductivity of the composite at the 40 wt% filler loading could reach 2.6 Wm−1K−1and 3.7 Wm−1K−1, respectively, which were 9.4 and 20 times higher than that of pure PPSU resin. The orientation degree of fillers was discussed by XRD and SEM. Then, heat conduction data were fitted and analyzed by the Agari model, and the heat conduction mechanism was further explored. The testing results also demonstrated that the material exhibited good conductivity, electromagnetic shielding effectiveness and superior thermal stability. Overall, the GnPs@Ni/PPSU composites had high thermal conductivity and were effective electromagnetic shielding materials at high temperatures.Keywords:graphene;thermal properties;composites
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Junmei Liang,Tao Chen,Jiapeng Liu,Qicheng Zhang,WenChao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Chemoselective hydrodeoxygenation (HDO) of lipids to diesel-like hydrocarbons is important for biomass to biofuel conversion. Here we design a new Ni-based catalyst (Ni/MoO 2 @Mo 2 CT x ) with extraordinary catalytic performance in the HDO of palmitic acid. To relieve the loss of C atom for Ni-based catalyst, partial oxidation of Mo 2 CT x MXene was used as a novel support. As a result, the catalytic activity and selectivity ratio of hexadecane/pentadecane (C 16 /C 15 ) were enhanced over Ni/MoO 2 @Mo 2 CT x catalyst, and the major product of palmitic acid HDO is C 16 , demonstrating a high C atom economy. This facilitated catalytic performance may be ascribed to the synergic effect of metal Ni, Mo 2 CT x MXene as well as MoO 2 active sites. The palmitic acid (–COOH) can convert into hexadecanal (–CHO) and hexadecanol (–CH 2 OH) over Ni/MoO 2 @Mo 2 CT x catalyst in the initial stage. The metal Ni further contributes to the hydrogenation of the hexadecanal to C 15 with the cleavage of C–C bonds by decarbonylation (DCO) route. MoO 2 nanoparticles obtained from Mo 2 CT x oxidation accelerate the scission of C–O bonds of the hexadecanol to improve the selectivity of C 16 by hydrogenation-dehydration route.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Bei Xue,Kezhi Li,Yao Guo,Jinhua Lu,Shengyue Gu,Leilei Zhang
Direct assembling 2D zeolitic imidazolate frameworks-derived (ZIFs)-derived Ni-Co oxide on Ni foam (Ni x Co 3−x O 4 /Ni foam) is a very attractive way to obtain high performance for electrochemical energy storage device. In this work, the highly optimized Ni x Co 3−x O 4 /Ni foam was prepared via facile co-precipitation, ion-exchange method and subsequently composited with rGO , acting as binder-less electrode for high properties hybrid supercapacitors . As electrode materials , the pure Co 3 O 4 /Ni foam shows 94.40 C g −1 (209.78 F g −1 ) at 1 A g −1 , while the highly optimized Ni x Co 3−x O 4 /Ni foam exhibits a high capacity of 870.3 C g −1 (1934F g −1 ) at 1 A g −1 . Compared with Ni x Co 3−x O 4 /Ni foam, the reduced graphene oxides (rGO) modified Ni x Co 3−x O 4 /Ni foam electrodes possess a porous conductive structure, displaying more superior capacity of 1440.99 C g −1 (3202.22F g −1 ) at 1 A g −1 and a higher cycling stability of 76.10% retention value after 1000 cycles. Subsequently, the Ni x Co 3−x O 4 /rGO/Ni foam electrodes were assembled as a hybrid supercapacitor , exhibiting a maximum energy density of 36.31 Wh kg −1 , a maximum power density of 8000 W kg −1 and a good cycling stability of 76.29% retention value after 3000 cycles. The Ni x Co 3−x O 4 /rGO/Ni foam also could light the blue LED device. Thereby, it is proved that Ni x Co 3−x O 4 /rGO/Ni foam is a promising materials for hybrid supercapacitors.
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GREEN CHEMISTRY
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2019
·Vol. 21
·期 20
·5647-5656
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IF 9.405
Xiaohao Liu,Xiaodong Liu,Guangyue Xu,Ying Zhang,Chenguang Wang,Qiang Lu,Longlong Ma
Selective conversion of cellulose into high value-added C3 chemicals is a great challenge in biorefinery due to the complicated reaction process. In this work, 61.6% yield of acetol was obtained by one pot conversion of cellulose using Ni–Sn/SiO2 catalysts. A series of characterization methods including TEM, STEM-HAADF, EDS, AAS, XRD, XPS, H2-TPR, Py-FTIR, and CO2-TPD were carried out to explore the structure–activity relationship. The strong basicity of the catalysts was a key factor affecting the production of acetol. In addition, catalysts with the hydrothermally stable L-acid sites and no B-acid sites inhibited side reactions and ensured efficient conversion of cellulose into small molecules. Further studies showed that the formation of the Ni3Sn4 alloy significantly promoted the acetol production, and its weak hydrogenation activity inhibited further conversion of acetol. Noninteger valence tin species (Snδ+ and SnOx) were formed both in Ni3Sn4 and Sn/SiO2. These Sn species were the source of basic sites and the active sites for catalyzing cellulose to acetol. Under the synergistic catalysis of Sn/SiO2 and the Ni3Sn4 alloy, cellulose was efficiently converted into acetol. This work provides guidance for the selective conversion of cellulose into C3 products.
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Journal of CO2 Utilization
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2019
·
IF 5.189
Qingxiang Ma,Yunxing Han,Qinhong Wei,Shengene Makpal,Xinhua Gao,Jianli Zhang,Tian-sheng Zhao
The bimodal mesoporous-macroporous alumina support was prepared via evaporation-induced self-assembly method (EISA), in which the polystyrene latex spheres with 100 nm diameter size were employed as sacrificial templates to fabricate macropores. The mesoporous-macroporous Al 2 O 3 -supported Ni catalyst (Ni/MM-A) was prepared by incipient-wetness impregnation method and applied for dry reforming of methane (DRM) to syngas. Characterizations by XRD, H 2 -TPR, SEM, and TEM revealed that the long-range ordered mesopore structure together with existing macropores was fabricated by using the EISA method, and the Ni particles were mainly stabilized inside the mesoporous channels of Al 2 O 3 support and the strong interaction between Ni and Al 2 O 3 was constructed. The Ni/MM-A catalyst exhibited more excellent catalytic performance in DRM reaction than that over Ni/M-A without macroporous structure. Stability tests for 100 h DRM reaction further indicated that the Ni/MM-A catalyst presented strong catalytic stability, which was significantly attributed to the macroporous structure that allowed the rapid mass transport, enhanced the tolerance to graphitic carbon and reduced the amount of graphitic carbon depositions.
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CHEMOSPHERE
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2019
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IF 5.108
Xinying Zhang,Chang Su,Xiaoyan Liu,Zhenguo Liu,Xia Liang,Yanming Zhang,Yuwei Feng
The aim of this study was to investigate whether the plant-growth-promoting rhizobacteria (PGPR) could enhance phytoremediation efficiency of Scirpus triqueter ( S.triqueter ) in the pyrene-Ni co-contaminated soil. We also expected to reveal the possible mechanism for the affected phytoremediation efficiency induced by PGPR. We used three kinds of contaminated soils (Ni-contaminated soil, pyrene-contaminated soil and pyrene-Ni co-contaminated soil) to conduct this pot study. After harvest, plants growth indicators, polyphenol oxidase (PPO) activity and soil microbial community structure of each treatment were investigated to explain the different dissipation rates of pyrene and removal rates of Ni between treatments with and without PGPR. The results showed that PGPR-inoculated S. triqueter increased dissipation rates of pyrene and removal rates of Ni in all three contaminated soils, among which Ni removal rates in Ni single contaminated soil was elevated most significantly, from 0.895‰ to 8.8‰, increasing nearly 9 folds. However, Ni removal rate efficiency in co-contaminated soil was weakened because more toxic and complicated co-contaminated soil restrained plant growth and Ni absorption. We also observed that co-contamination harmed the soil microbial community more severely than that in single pyrene or Ni contaminated soil through phospholipid fatty acids analysis. Furthermore, dissipation rates of pyrene and removal rates of Ni were found positively correlated to the PPO activity and the abundance of branched and saturated fatty acids reflected by Pearson correlation analysis.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Hongcai Su,Ekkachai Kanchanatip,Defeng Wang,Haidan Zhang,Antoni,Ishrat Mubeen,Zhicheng Huang,Mi Yan
Ni/Al 2 O 3 catalyst is the one of promising catalysts for enhancing H 2 production from supercritical water gasification (SCWG) of biomass. However, due to carbon deposition , the deactivation of Ni/Al 2 O 3 catalyst is still a serious issue. In this work, the effects of lanthanum (La) as promoter on the properties and catalytic performance of Ni/Al 2 O 3 in SCWG of food waste were investigated. La promoted Ni/Al 2 O 3 catalysts with different La loading content (3–15 wt%) were prepared via impregnation method. The catalysts were characterized using XRD , SEM, BET techniques. The SCWG experiments were carried out in a Hastelloy batch reactor in the operating temperature range of 420–480 °C, and evaluated based on H 2 production. The stability of the catalysts was assessed by the amount of carbon deposition on catalyst surface and their catalytic activity after reuse cycles. The results showed that 9 wt% La promoter is the optimal loading as Ni/9La–Al 2 O 3 catalyst performed best performance with the highest H 2 yield of 8.03 mol/kg, and H 2 mole fraction of 42.46% at 480 °C. La promoted Ni/Al 2 O 3 catalysts have better anti-carbon deposition properties than bare Ni/Al 2 O 3 catalyst, resulting in better gasification efficiency after reuse cycles. Ni/9La–Al 2 O 3 catalyst showed high catalytic activity in SCWG of food waste and had good stability as it was still active for enhancing H 2 production when used in SCWG for the third time, which indicated that La promoted Ni/Al 2 O 3 catalysts are potential additive to improve the SCWG of food waste.
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高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 12
·1688
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IF 4.034
Xiaoyu Hu,Peilong Li,Xin Zhang,Bin Yu,Chao Lv,Ning Zeng,Junhong Luo,Zhi Zhang,Jiangfeng Song,Yong Liu
A high-efficient and low-cost catalyst on hydrogen isotope separation between hydrogen and water is an essential factor in industrial application for heavy water production and water detritiation. In past studies, Pt-based catalysts were developed but not practical for commercial use due to their high cost for vapor phase catalytic exchange (VPCE), while for impregnated nickel catalysts with a lower cost the problems of agglomeration and low Ni utilization existed. Therefore, to solve these problems, in-situ grown Ni-based catalysts (NiAl-LDO) derived from a layered double hydroxide (LDH) precursor were fabricated and first applied in VPCE in this work. Compared with traditional impregnated Ni-based catalysts, NiAl-LDO catalysts own a unique layered structure, homogeneous dispersed metallic phase, higher specific surface area as well as stronger metal-support interactions to prevent active metal from agglomerating. These advantages are beneficial for exposing more active sites to improve dynamic contacts between H2and HDO in a catalyst surface and can bring excellent catalytic activity under a reaction temperature of lower than 400 °C. Additionally, we found that the dissociative chemisorption of HDO and H2occurs not only in Ni (111) but also in NiO species where chemisorbed H(ads), D(ads), OH(ads) and OD(ads) are formed. The results highlight that both of the Ni2+species and Ni0species possess catalytic activities for VPCE process.Keywords:vapor phase catalytic exchange;layered double oxides;Ni catalyst;water detritiation
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ENERGY CONVERSION AND MANAGEMENT
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2019
·
IF 7.181
Jie Ren,Jing-Pei Cao,Fei-Long Yang,Xiao-Yan Zhao,Wen Tang,Xin Cui,Qiang Chen,Xian-Yong Wei
Lignite rich in oxygen-containing species (OCSs) was employed as perfect ion-exchange material for high activity catalyst preparation. HCl treatment Shengli lignite (HSL) selectively removed the organic salt and improved capability of ion exchange. In this paper, highly desirable and layered carbon supported Ni catalyst was prepared by modified lignite. Thanks to the excellent role of Ni (1 1 1) plane and porous layered graphene-like delocalized electronic structure, specific structure of lignite provides an exchange platform in facilitating the Ni electron transfer during the catalytic reaction process. Ni loaded on HSL (Ni/HSL) showed the great catalytic activity and stability for reforming of toluene and biomass tar. Ni/HSL prepared at 650 °C shows the great activity and stability for toluene steam reforming (TSR) and biomass tar reforming (BTR). A series of instruments (XRD, SEM, TEM, H 2 -TPR, XPS, CO pulse adsorption, etc.) were employed for characterization. Based on these significant characterizations of catalyst, calculation of turnover frequency (TOF), and results of conversion of toluene and corncob tar. The results revealed the layered delocalized electronic structure of Ni/HSL, which has lower activation energy than other reported catalysts. Uniform dispersed catalyst was synthesized successfully for reforming of toluene and biomass tar.
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ELECTROCHIMICA ACTA
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2019
·
IF 5.383
Juan Xia,Qi Wang,Miaomiao Chen,Wenwen Li,Jie Liu,Jitang Chen,Hai Wu,Suhua Fan
To avoid the evaporation and leakage of the liquid electrolyte and increase the long-term stability of the cell, a strategy was developed to construct bifacial dye-sensitized solar cells employing quasi-solid-state electrolyte (BQDSSCs). Two metal selenides with different morphologies, Co 0.85 Se, which has a foliate structure like the structure of graphene, and Ni 0.85 Se, which has uniform nanoparticle , were synthesized by a facile one-step hydrothermal method . The proposed BQDSSCs were then constructed using the TiO 2 photoanode, polyvinylidene fluoride gel electrolyte, and Co 0.85 Se or Ni 0.85 Se as the counter electrode (CE) electrocatalysts . Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization measurements were performed to investigate the electrochemical behavior of the Co 0.85 Se, Ni 0.85 Se, and Pt CEs. The results showed that the graphene-like Co 0.85 Se material exhibited better operational stability, greater charge-transfer ability, and higher electrocatalytic activity for the reduction of I 3 − than the Ni 0.85 Se nanoparticles. Furthermore, for the BQDSSCs, Co 0.85 Se yielded the highest power conversion efficiencies (PCE) of 8.33% and 4.79% under front and rear irradiations, respectively, in comparison with the front and rear efficiencies of 7.44% and 4.05% for Pt and 7.23% and 4.16% for Ni 0.85 Se CEs, respectively. The BQDSSC device based on the Co 0.85 Se CE exhibited good long-term stability with only a 5% drop in power conversion efficiency after 1000 h of one-sun soaking. Consequently, graphene-like Co 0.85 Se was considered to be an ideal material for constructing cost-effective BQDSSCs.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 16
·5315-5326
·
IF 4.052
Shaolei Zhao,Keyu Tao,Yun Gong
Co-Incorporated NiV2O6/Ni(HCO3)2 arrays with different morphologies can grow on nickel foam (NF) via a mild one-step hydrothermal method. Among them, S-0.5-20 and S-0.25-20 were obtained at a 1 : 1 : 20 molar ratio of Co/V/urea with 0.5 and 0.25 mmol Co(NO3)2, respectively. They demonstrate high areal capacities of 0.99 mA h cm−2 (7.94 F cm−2) and 0.56 mA h cm−2 (4.48 F cm−2) at 1 mA cm−2, respectively, which are superior to that of Co-incorporated Ni(HCO3)2/NF synthesized in the absence of Na3VO4. S-0.25-20 possesses good rate capability with 82.1% retention when the current density is increased 20-fold, and it shows superior long-term durability with 106.2% retention of the initial capacity after 10 000 charging/discharging cycles at 100 mA cm−2. These results are associated with the porous and orderly hierarchical Co-incorporated NiV2O6/Ni(HCO3)2 nanoflake arrays directly grown on the Ni foam. Moreover, due to the synergetic effect of the individual components, electrons can be transferred from V centers to Ni active sites, thus improving the stability of the vanadate. The generation of more active species, such as Co3+, during cycling could account for the increased capacity. A S-0.25-10//activated carbon (AC) asymmetrical supercapacitor shows a high energy density of 0.533 mW h cm−2 at a power density of 0.232 mW cm−2 (0.415 mW h cm−2 at 4.983 mW cm−2). Furthermore, the formation mechanism of the Co-incorporated NiV2O6/Ni(HCO3)2 nanoflake arrays is proposed.
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危险品化学品经营许可证（带存储）