Polymer-Plastics Technology and Materials
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2019
·
IF 0
Ying Pan,Ke Ke,Lin Cheng,Hongting Zhao
In this study, flexible polyurethane foam (FPUF) was successfully coated with nano-Mg(OH)2 platelets. Due to the strong interaction between chitosan and nano-Mg(OH)2, it was possible to yield modified foam with a weight-gain of up to 15 wt% by depositing one chitosan layer and one nano-Mg(OH)2 layer. Meanwhile, the adsorption isotherms of Cu2+ on FPUF covered with 10 wt% coating (FPUF-10) shows the Langmuir behavior. It was found that for the FPUF-10, the removal % for Cu2+ after 30 min and 50 min treatment were 86% and 90%, respectively. Moreover, the maximum removal % could reach up to 95%.
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ENERGY & FUELS
·
2019
·
IF 3.021
Jingwei Li,Lijuan Jiang,Shuai He,Licheng Wei,Rongfu Zhou,Jinming Zhang,Dingsheng Yuan,San Ping Jiang
Development of efficient, stable, and robust bifunctional electrodes is important for the practical and industrial application of water electrolysis technologies for renewable hydrogen production. Here, we report the fabrication of heterostructured Ni(OH)2 nanosheets/Ni3S2 nanoneedles grown on Ni foam, Ni(OH)2/Ni3S2/NF, as a highly active and mechanically strong bifunctional electrode for overall water splitting. The results indicate that heterostructured Ni(OH)2/Ni3S2 interfaces are the reactive center for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The redistribution of electrons and formation of the Niδ+ and Sδ− active species serve as the hydroxyl and proton acceptors and significantly promote the transformation of intermediate species and charge transfer processes in both the OER and HER. The Ni(OH)2/Ni3S2/NF electrode shows overpotentials as low as 252, 279, and 319 mV to reach 30, 50, and 100 mA cm–2, respectively, for OER and 48, 79, and 185 mV to achieve 10, 20, and 100 mA cm–2, respectively, for HER in 1.0 M KOH solution. An alkaline electrolyzer assembled by bifunctional Ni(OH)2/Ni3S2/NF electrodes displays cell voltages of 1.80 V to deliver 100 mA cm–2 and is stable for over 100 h. This study demonstrates promising potential of the Ni(OH)2/Ni3S2/NF bifunctional electrode for advancing water-splitting technologies.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 38
·24561-24569
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IF 3.906
Ping Wang,Hengyan Yang,Ding Wang,AiYing Chen,Wei-Lin Dai,Xianglong Zhao,Junhe Yang,Xianying Wang
We report a feasible strategy via hydrothermal crystallization to activate Kagome lattice-structured Cu3V2O7(OH)2·2H2O volborthite mineral as a stable visible-light-driven photocatalyst. It was demonstrated to play a crucial role in stimulating absorption ability and photodegradation performance for the removal of methylene blue present in high concentration. In contrast, direct calcination was almost ineffective, whereas post-calcination was significantly detrimental. Moreover, the photocatalytic water oxidation activity of hydrothermally crystallizated volborthite was comparable to that of BiVO4, and it was clearly higher than those of WO3 and g-C3N4 from aqueous NaIO3 solution. By further in situ decoration with an optimum amount of CoOx cocatalysts (i.e., 2 wt%), the oxygen evolution rate of volborthite was greatly enhanced, and it was 1.6-fold, 1.8-fold and 2.9-fold higher than those of BiVO4, WO3 and g-C3N4, respectively. The importance of hydrothermal crystallization can be elucidated in terms of water-Kagome lattice structure interactions involving built-in intrinsic electric field and formation of single hydrogen bonds.
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PubMed
高影响因子
ChemCatChem
·
2018
·Vol. 10
·期 20
·4555-4561
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IF 4.674
Xiaoguang Liang,Ruoting Dong,Dapan Li,Xiuming Bu,Fangzhou Li,Lei Shu,Renjie Wei,Johnny C. Ho
Graphical A hierarchical porous electrocatalyst structure utilizing Ni(OH) 2 nanosheets directly synthesized on Ni foam as the conductive and interconnected supports is developed for the deposition of Ni−B nanoparticles by using the facile dip-coating method. This synergistic hybrid electrocatalyst system configured of Ni−B nanoparticles, Ni(OH) 2 nanosheets and Ni foam can exhibit dramatically electrocatalytic activities and superior long-term stabilities towards oxygen evolution reaction. Earth-abundant and highly-efficient electrocatalysts for oxygen evolution reaction (OER) are urgently desired to realize the large-scale storage and conversion of renewable energies. In this work, we develop a hierarchical porous electrocatalyst structure utilizing Ni(OH) 2 nanosheets directly synthesized on Ni foam as the conductive and interconnected supports. By coupling with amorphous Ni−B nanoparticles, this hybrid catalyst exhibits dramatically enhanced electrocatalytic activities and durabilities towards OER. In specific, along with the optimized Ni−B loading, this catalyst requires only an impressively small overpotential of 300 mV to drive a current density of 100 mA cm −2 for oxygen evolution in 1 M KOH electrolyte. Meanwhile, it also yields a small Tafel slope of 49 mV dec −1 and a superior long-term stability. All these results evidently indicate that the hierarchical hybridization of Ni−B with Ni(OH) 2 on Ni foam can effectively synergize the oxygen evolution, opening up a new vista for designing high-performance transition metal-based nanostructures in the field of electrochemical water splitting.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2013
·Vol. 37
·期 10
·3024-3029
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IF 2.966
Yinhua Jin,Jianhua Liu,Quan Zheng,Jun Xu,Bhoj Raj Sharma,Guilin He,Min Yan,Lin Zhang,Yang Song,Tao Li,Qinghai Yuan,Yong Sun,Haishan Yang
Molecular imaging techniques have shown increasing potential in the definition and imaging of the structure and function of biological systems for preclinical applications. Herein, we report a high-quality dual-modal imaging platform based on water-stable gadolinium-doped Yb(OH)CO3 nanoparticles. These nanoprobes were prepared via a one-pot method, meeting the criteria for a biomedical material. Compared with iobitridol, which is routinely used in clinical applications, our Yb(OH)CO3:Gd nanoparticles provided greatly enhanced contrast at regularly used clinical voltages. By virtue of their doping with gadolinium, these well-designed nanostructures could also be applied as an excellent MRI nanoprobe, which provided similar biodistribution results with our CT experiments. Detailed in vitro and in vivo toxicological study indicated that the uniformly sized nanoparticles possessed high biocompatibility and also low toxicity, making them safe for clinical use. The concept presented here shows great potential for the design and synthesis of nanoprobes with high imaging efficiency and low systemic toxicity.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2015
·
IF 4.642
Zanyong Zhuang,Xinwen Ou,Jingyuan Li,Yuan Zhou,Zhihong Zhang,Shengfa Dong,Zhang Lin
Abundant salts and complex constituents pose challenges to the enrichment of trace-level uranyl from field water samples. On the basis of the chemical behavior of the uranyl cation in several physical–chemical conditions (in the presence of MgCl2 etc.), we developed a facile and green strategy to improve the uranyl extraction from field water samples, different from the traditional way with organic impregnation. In our systems about nano-Mg(OH)2 treating salt lake brine, when the adsorbent is pretreated with a trace amount of UO22+ ion, the ability to extract uranyl from brine can increase by 2–5 times. The molecular dynamics simulation and time-resolved laser-induced fluorescence spectroscopy analysis show that, in the preadsorption stage, UO22+ ions can steadily bind to the Mg(OH)2 (001) surface because of the interaction with surface hydroxyl groups. When pretreated Mg(OH)2 was exposed to brine, the coordination interaction between the preloaded UO22+ ion and the [UO2(CO3)x(2x–2)–] in solution engenders good selectivity and affinity for uranyl over competitive ions in brine. Besides, the coordination number of UO22+ by carbonate oxygen is large, which further facilitates subsequent adsorption. Such strategy does not introduce other impurities and can apply to metal-oxides-type adsorbents, e.g., TiO2. This study should shed light on further improvement of efficient uranyl extraction from field samples and give insights into the mechanism understanding of uranyl adsorption in real systems.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
·
IF 2.76
Yu Zheng,Ping Zhang,Hairong Yue,Gang Xiang,Zexin Qian,Hongtai Li,Wei Jiang,Bin Liang,Simo O. Pehkonen,Shaojun Yuan
Ni 3 Si 2 O 5 (OH) 4 nanotubes (NTs) are synthesized by a facile one-pot hydrothermal reaction, and further functionalized by grafting of poly(methacrylic acid) (PMAA) brushes via distillation-precipitation polymerization. The resultant PMAA-grafted NTs are used as a novel nanosorbent to uptake copper(II) ions. Success in each functionalization step is ascertained by the characterization of TEM, FTIR, XPS, SEM and TGA. Batch adsorption results indicate that the adsorption of the pristine and PMAA-grafted silicate NTs is fairly fast and the equilibrium is established within 20 min, and the kinetics follow the pseudo-second-order mechanism, evidencing chemisorption as the rate-limiting step. The best interpretation for the equilibrium data is given by Langmuir isotherm, and the maximum adsorption capacity is 2.13 mmol g −1 (136 mg g −1 ) at pH 5 and 25 °C. The successive adsorption-desorption studies reveal that the PMAA-grafted silicate NTs are readily regenerated, and keep their adsorption and desorption efficiencies constant over five cycles. The Ni 3 Si 2 O 5 (OH) 4 - g -PMAA NTs could be directly reduced via hydrothermal reaction to achieve magnetic property for easy separation. With the inherent advantages of pH-sensitivity of PMAA, large surface area and magnetic properties of Ni 3 Si 2 O 5 (OH) 4 NTs, the PMAA-grafted silicate NTs offer a promising and highly efficient nanocomposite sorbent to remove heavy metal ions from aqueous solution.
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高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 42
·6305-6313
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IF 3.474
Abraham Adenle,De-Kun Ma,De-Peng Qu,Wei Chen,Shaoming Huang
The fabrication of hollow micro- and nanocrystals can not only increase the specific surface area of the materials but also benefit the understanding of the crystal facet-dependent catalytic activity. On the other hand, both the rational doping of heteroatoms and loading of co-catalysts can enhance the photocatalytic activity of semiconductor-based photocatalysts. However, up to now, there have been only a few reports on the synergetic effect of the two. In this work, BiVO4 hollow microplates (HMPs) and solid microplates (SMPs) were synthesized by a facile hydrothermal route, and B3+ ion-doped BiVO4 HMPs loaded with Co(OH)2 nanoparticles [Co(OH)2/B–BiVO4] were prepared through a one-step impregnation method. The as-prepared products were characterized in detail. The formation mechanism of BiVO4 HMPs was also proposed on the basis of time-dependent SEM observations and XRD analyses. Taking rhodamine B (RhB) as a kind of pollutant model, the photocatalytic activities of BiVO4 HMPs, BiVO4 SMPs, B3+ ion-doped BiVO4 HMPs, BiVO4 HMPs loaded with Co(OH)2 nanoparticles, and Co(OH)2/B–BiVO4 HMPs were systematically studied. The results show that {010}-dominant BiVO4 SMPs exhibited better photocatalytic activity for the degradation of RhB than {010} and {110}-dominant BiVO4 HMPs. In addition, the doping of B3+ ions and loading of Co(OH)2 nanoparticles could synergistically enhance the photocatalytic activity of BiVO4 HMPs. The present study not only provides reliable evidence for the crystal facet-dependent photocatalytic activity of BiVO4 but also develops a new strategy for enhancing its photocatalytic activity.
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高影响因子
RSC Advances
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2016
·Vol. 6
·期 88
·85367-85373
·
IF 3.289
Wenle Ma,Li Wang,Junying Xue,Hongtao Cui
Usually, monolayer-stated nanosheets of hydroxides have to be prepared by a multiple step layer-exfoliation processe, following “bottom-up” mechanism. The related preparative procedure is quite exhaustive and low yielding. In this work, α-Ni(OH)2 monolayer nanosheets were successfully synthesized in pure ethanol solution with a high yield using NaOH as a precipitant, based on a facile one-step “bottom-up” strategy. It was proposed that the water-deficient environment in ethanol solution could not provide adequate water molecules for the formation of hydrogen bond to link the layers, resulting in monolayer formation. Due to the large interface between the monolayer and electrolyte, the obtained monolayer nanosheets presented high electrochemical performance.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Hongying Zhao,Ying Chen,Qiusheng Peng,Qingning Wang,Guohua Zhao
A novel bifunctional MOF(2Fe/Co)/CA cathode with a high surface possessing area, and good electrocatalytic and photocatalytic activity, was proposed for the solar photo–electro–Fenton (SPEF) process. The optimal nFe: nCo ratio was 2:1 for successfully introducing MOF(2Fe/Co) on the surface of CA, which is due to the specific interaction affinity of FeOOH between MOF(2Fe/Co) and CA. Continuous on–site generation of H 2 O 2 through an oxygen reduction reaction (ORR) was achieved over the CA cathode. The electron transfer number (n) of the ORR with CA was 2.5 in the selected potential range. Moreover, the addition of MOF can behave as the active sites for enhancing the ORR activity and hence can increase the yield of the H 2 O 2 . Simultaneously, the photoinduced electron (e cb − ) of MOF(2Fe/Co) efficiently in–situ decomposed H 2 O 2 to form hydroxyl radicals ( OH). The observation indicated that the e cb − is an efficient and new Fenton–like catalysts that is pH–independent. Efficient photo–electro–catalytic performance was exhibited when applied to degrade Rhodamine B (RhB) and dimethyl phthalate (DMP). Almost 100% RhB removal and 85% DMP removal were reached in 45 min and 120 min, respectively. The MOF(Fe/Co)/CA presented very low iron and cobalt leaching (<0.5 ppm) even in an acidic media, and it retained an efficient degradation efficiency in the wide pH range of 3–9.
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高影响因子
GREEN CHEMISTRY
·
2017
·Vol. 19
·期 24
·5809-5817
·
IF 9.125
Haidong Yang,Yu Long,Yan Zhu,Ziming Zhao,Ping Ma,Jun Jin,Jiantai Ma
The exploration of highly efficient nonprecious metal-based electrocatalysts for the oxygen evolution reaction (OER) is of great importance for potential applications in sustainable energy conversion. Recently, the layered metal hydroxide (LMH) family is receiving extensive research attention owing to its unique structural properties. However, the gained electrocatalytic performance of LMH-based catalysts for the OER is still far from the state-of-the-art requirements because of its finite number and poor reactivity of exposed active sites. In response, we synthesized crystal lattice distorted ultrathin cobalt hydroxide (denoted as CLD-u-Co(OH)2) nanosheets with a great number of efficient catalytic active sites through the introduction of Ga into ultrathin Co(OH)2, followed by a selective removal of Ga, denoted as the “introduction @ removal” process. As a result, the crystal lattice distortion confined inside CLD-u-Co(OH)2 generates abundant elongated Co–OOH bonds on exposed (10) facets serving as efficient catalytic active sites for the OER. Besides, the optimized amount of “introduction @ removal” of Ga (4 at%) allows for an exquisite balance between distortion engineering and electrical conductivity, synergistically. The as-prepared CLD-u-Co(OH)2 achieves an overpotential of 265 mV at a current density of 10 mA cm−−2, an unexpectedly small Tafel slope of 47 mV dec−−1, and a long-term stability (beyond 20 h) in basic media. It is mainly attributed to abundant catalytic active sites, robust reactivity per site, and good electrical conductivity. Furthermore, the green and sustainable engineering of crystal lattice distortion to improve the intrinsic electrocatalytic activity of CLD-u-Co(OH)2 nanosheets presented in this work may provide a promising strategy to design and synthesize newly highly efficient LMH-based electrocatalysts for the OER.
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高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Chun Tang,Zhi Liang Zhao,Jie Chen,Bo Li,Liang Chen,Chang Ming Li
The direct urea fuel cell holds great promise for energy-sustainable developments and mitigating water contamination but it still faces a great challenge to overcome the sluggish kinetics of the urea oxidation reaction (UOR). In this work, we report Se-Ni(OH) 2 -shelled vertically oriented NiSe nanowires on a Ni foam as an electrocatalyst toward UOR, showing a low potential of 0.366 V vs. SCE to drive 100 mA cm −2 in alkaline solution and out-performing all the reported non-noble-metal UOR catalysts up to date. Experimental results and theoretical calculation reveal that the vertically and distantly arranged nanowires with highly porous structure produce high mass transport paths for urea to fully access the reaction sites, the NiSe core offers high conductivity for fast electron transport , and the Se-Ni(OH) 2 shell provides large amount of active catalytic sites while lowering the CO 2 adsorption/desorption barrier than Ni(OH) 2 for fast reaction kinetics. This work opens up an exciting new direction to design electrocatalysts for high performance fuel cells and other energy applications.
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高影响因子
危险品化学品经营许可证（带存储）