JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Yunfei Sun,Min Ma,Bo Tang,Sen Li,Li Jiang,Xiaohong Sun,Miaoling Que,Chongben Tao,Zhengtian Wu
The copper-benzene-1,3,5-tricarboxylate (Cu-BTC) attracts increasing attention because of its large BET surface area available for the adsorption of gases. However, low stability in water creates a barrier for its potential applications. In this study, graphene oxide (GO) and reduced graphene oxide (RGO) are adopted to modify the Cu-BTC. The influence of GO and RGO on the resulting BET surface area, pore diameter distribution, morphology and yield of the Cu-BTC are revealed. It is found that the adsorption abilities of the resulting composites for the polar and nonpolar gas molecules are closely related to the presence at surface of the functional groups of the used graphene samples, which provides a potential method to achieve selective adsorption. Furthermore, the preparation processes of the GO/Cu-BTC and RGO/Cu-BTC exert a significant effect on the performances of the resulting product, which is also studied in detail.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
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2019
·
IF 3.073
Juan Ma,Baiqin Zhou,Hong Zhang,Wenbo Zhang,Zhilong Wang
Tetracycline with high solubility and biodegradation-resistance has been widely detected from both surface and ground water, and has been proved negative impact on water environment and human health. Adsorption is considered as an environment-friendly and efficient approach to deal with TC contamination in wastewater treatment . In this work, KOH activating municipal wasted sludge biochar with different amounts of nanoscale Fe/Cu was prepared and used to remove TC from water with high performance. The removal efficiency of the composite was found to be significantly improved after loading Fe/Cu particles and the highest removal amount could reach to 386.93 mg/g under the optimum molar ratio of Fe:Cu = 5:3. The analytical results of isotherms, kinetics and thermodynamics suggested that the excellent removal performance of TC by the composite was involved many mechanisms, such as physical adsorption, hydrogen bonding, π–π interaction, complexation and electron transfer. The removal mechanisms of TC and the characteristics of composite were also confirmed by FTIR, XRD , XPS and BET determination. The excellently improved adsorption capacity , environmental-friendly and readily-made properties entrusted the novel sludge-based composite with great potential for TC removal from wastewater.
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Catalysts
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2019
·Vol. 9
·期 6
·538
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IF 3.444
Lili Liu,Xiaojing Zhou,Li Liu,Shuai Jiang,Yingjie Li,Luxia Guo,Shijuan Yan,Xishi Tai
Three bimetallic Cu–Ni nanoparticle-supported catalysts were synthesized by co-immobilization followed by H2reduction. A chromium(III) terephthalate metal organic framework (MIL-101), titanium dioxide (TiO2), and carbon (C) with different properties (acidity and Brunauer–Emmett–Teller surface area) were selected as supports for studying the effect of the support nature on the catalytic activity and selectivity in the oxidation of benzyl alcohol. The physicochemical properties of the Cu–Ni-supported catalysts were characterized by XRD, NH3-TPD, nitrogen adsorption/desorption, TEM, EDS, XPS, and ICP-OES. Bimetallic Cu–Ni nanoparticles were highly dispersed on the support. The catalytic activities of CuNi/MIL-101, CuNi/TiO2, and CuNi/C were tested in the selective oxidation of benzyl alcohol to benzaldehyde in the presence of molecular oxygen under mild reaction conditions. The highest benzaldehyde yields were achieved with CuNi/TiO2, CuNi/MIL-101, and CuNi/C catalysts at 100 °C within 4 h under 5, 3, and 3 bar of O2, respectively. The bimetallic Cu–Ni-supported catalysts possessed two types of catalytic active sites: acid sites and bimetallic Cu–Ni nanoparticles. The CuNi/MIL-101 catalyst possessed a high number of acid sites and exhibited high yield during selective benzyl alcohol oxidation to benzaldehyde. Importantly, the catalysts exhibited a high functional group (electron-donating and electron-withdrawing groups) tolerance. Cu–Ni-supported catalysts with an Cu:Ni mole ratio of 1:1 exhibited the highest yield of 47% for the selective oxidation of benzyl alcohol to benzaldehyde. Reusability and leaching experiment results exhibited that CuNi/MIL-101 showed better stability than CuNi/TiO2and CuNi/C catalysts due to the large porous cavities of MIL-101 support; these cavities can be used to trap bimetallic Cu–Ni nanoparticles and inhibit nanoparticle leaching.Keywords:Cu–Ni nanoparticles;MIL-101;TiO2;carbon;benzyl alcohol oxidation
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WATER ENVIRONMENT RESEARCH
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2019
·Vol. 91
·期 8
·770-779
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IF 1.24
Jinhong Fan,Hehe Qin,Yunfei Zhang,Simin Jiang
In this study, Fe/Cu bimetal composite was prepared by high-energy ball milling (BM) method for the removal of refractory organics. The BM Fe/Cu bimetal was characterized by SEM-EDS, XRD, and XPS. Evenly distributed Fe and Cu was observed in the EDS mapping. In contrasting experiments, the removal rate of 4-chlorophenol (4-CP) by BM Fe/Cu materials was about 10-fold faster than that by chemical substitution deposition (CSD) of Fe/Cu material. Complete 4-CP removal and 66.7% of total organic carbon (TOC) mineralization in the BM Fe/Cu–O 2 system were achieved. Dissolved oxygen plays a crucial role for 4-CP degradation through the in situ generation of reactive oxygen species (ROS) such as H 2 O 2 , ·OH, and via oxygen activation reactions. The predominant reactive radicals were identified to be and ·OH through ESR technique and inhibition experiments. The coexistence of oxidation and reduction of 4-CP in the BM Fe/Cu-O 2 system was proposed. Practitioner points 4-CP removal rate by BM Fe/Cu is 10-fold faster than that by CSD Fe/Cu at the same conditions. Complete 4-CP removal and 66.7% of TOC reduction were achieved. All three ROS including ·OH, , and H 2 O 2 coexisted in the BM Fe/Cu-O 2 system. A harmonious coexistence of oxidation and reduction mechanism was proposed.
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高影响因子
Journal of Materials Chemistry A
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2019
·Vol. 7
·期 10
·5712-5718
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IF 10.733
Ying Zhou,Kai Zhao,Yu Han,Zhenhe Sun,Hongtao Zhang,Lingqun Xu,Yanfeng Ma,Yongsheng Chen
The two most challenging issues for Li metal anodes are large volume change during the plating/stripping process and the growth of Li dendrites induced by uneven Li deposition. They lead to low coulombic efficiency, short cycling lifespan and serious safety issues of Li metal batteries. Here we developed a facile strategy to prepare a nitrogen-doped-carbon/ZnO (NDC/ZnO) modified Cu foam (MCuF) current collector for Li metal anodes. The MCuF shows stable Li plating/stripping behavior with the Li dendrite-mitigation feature. The resultant half cells achieve a super long lifespan of over 600 cycles at 1 mA cm−2 and over 200 cycles at a high current density 10 mA cm−2. Moreover, the full cell paired with LiFePO4 also exhibits a long lifespan of over 150 cycles at a high rate of 5C. Such high performance can be attributed to the characteristics of MCuF, including its 3D porous structure with high conductivity, enlarged surface area and uniform lithophilic NDC/ZnO sites. We believed that our work can provide a facile strategy for fabricating high-performance 3D current collectors for Li metal storage and stable Li metal batteries.
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CATALYSIS LETTERS
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2019
·Vol. 149
·期 4
·974-984
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IF 2.372
Zhang Xiaotong,He Ning,Liu Chunyan,Guo Hongchen
Highly dispersed Pt–Cu alloy nanoparticles encapsulated in silicalite-1 were prepared by one-pot method. Taking propane dehydrogenation as a probe reaction, it was found that anti-coke ability was improved by encapsulation. Through H 2 -TPR, CO adsorption DRIFT spectra and X-ray Photoelectron Spectroscopy experiment, enhanced anti-coke ability was ascribed to the electronic environment change of encapsulated metal. And it was further confirmed by in situ coking experiment. Owning to limited acidity, metal encapsulated by silicalite-1 molecular sieve exhibited better anti-coke ability and higher propylene selectivity than that by stronger acidic ZSM-5 molecular sieve. Moreover it was found that the combination of Cu and Pt made better catalytic performance and accelerated dehydrogenation more effectively compared with monometallic catalysts. Therefore, Pt–Cu alloy nanoparticles encapsulated in silicalite-1 molecular sieve core–shell material was a potential coke-resistant catalyst for alkane dehydrogenation reaction. Graphical Abstract
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Nano Research
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2018
·Vol. 11
·期 3
·1379-1388
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IF 7.994
Liu Xiao-Yuan,Zhang Guozhen,Chen Hao,Li Haowen,Jiang Jun,Long Yi-Tao,Ning Zhijun
The development of photocatalysts that can effectively harvest visible light is essential for advances in high-efficiency solar-driven hydrogen generation. Herein, we synthesized water soluble CuInS 2 (CIS) and Cu-In-Zn-S (CIZS) quantum dots (QDs) by using one-pot aqueous method. The CIZS QDs are well passivated by glutathione ligands and are highly stable in aqueous conditions. We subsequently applied these QDs as a light harvesting material for photocatalytic hydrogen generation. Unlike most small band gap materials that show extremely low efficiency, these new QDs display remarkable energy conversion efficiency in the visible and near-infrared regions. The external quantum efficiency at 650 nm is ∼1.5%, which, to the best of our knowledge, is the highest value achieved until now in the near-infrared region.
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Materials Research Express
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2018
·Vol. 5
·期 7
·075030
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IF 1.151
Jian Feng,Xiaosheng Yang,Guangwei Feng,Hong Xu
In this study, the different compositions of Zn–Cu–In–S quantum dots (ZCIS QDs) were prepared by a facile synthetic approach. The compositions and particle sizes of ZCIS nanocrystals were precisely controlled. The composition-dependent molar extinction coefficient of nonstoichiometric ZCIS QDs has been determined by combination of ICP-MS with UV–vis absorption and TEM. The molar extinction coefficient values were found to comply with a power function with exponents of 3.6 and 1.8 with the variation of the content of Cu or Zn, respectively. The extinction coefficient of ZCIS QDs exhibited the composition dependency and seemed to be larger than that of CuInS2 for a given size. The determination of the extinction coefficient makes it feasible to calculate the concentration of ZCIS QDs in solution and promotes its further applications in bioanalysis.
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BIOSENSORS & BIOELECTRONICS
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2018
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IF 8.173
Xuewei Wang,Chi Zhang,Yajie Zhang,Jian Sun,Leilei Cao,Jinkai Ji,Fude Feng
Functionalization of π-conjugated polymers is dispensable for solubilization of the rigid and hydrophobic backbones in water. However, polymer aggregation is always present and leads to issues with complication and reproducibility in spectral properties. Herein, we reported a simple and robust method to make a series of conjugated polymer nanostructures by a crosslinking strategy. In favor of multivalency effect, polythionenes with various chain lengths were functionalized with branched polyethylenimine (PEI) via ester aminolysis reaction under mild conditions. Photophysical studies revealed the conjugated backbones could be well stabilized and dispersed in water. By taking advantage of intermolecular recognition interaction between copper ions and cationic PEI, we applied crosslinked polythiophenes as a nano probe at very low concentration (0.01 mg/mL) to fluorescently detect copper ions with high sensitivity up to 10 nM and selectivity over other metal ions in aqueous solutions, without occurrence of detectable aggregates. The overall performance of our nano probes outperforms reported water-soluble polymers-based probes, particularly in probe availability and manipulation as well as selective copper detection capability.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xin Xu,Kang Shen,Min Wen,Qingliu Wu,Guangya Hou,Huazhen Cao,Liankui Wu,Guoqu Zheng,Yiping Tang
A three-dimensional (3D) Cu/Fe 3 O 4 anode material was synthesized successfully via a simple and flexible route. Cu nanowires grew on Cu sheet directly by oxidation and reduction as 3D current collector, Fe 3 O 4 nanosheets were coated on the collector surface by electrodeposition to form 3D Cu/Fe 3 O 4 nanocomposite. The characterization results showed that oxidation time affects the morphology of Cu nanowires greatly, the collector has optimum 3D nanostructure at 200 s oxidation with high performance. The 3D Cu/Fe 3 O 4 anode possessed high cycling capability, the capacity reached 700 mAh/g after 300 cycles at 0.5 A/g. And it exhibited high rate performance, the capacity reached 482 mAh/g at 2 A/g and it recovered to 853.5 mAh/g at 0.2 A/g after 100 cycles of different rate tests. The high performance is ascribed to the unique 3D nanostructure of current collector, which provides sufficient space for large volume change and stress release, and reduces the distance for transporting lithium ions and electrons.
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JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Yiping Tang,Kang Shen,Ziye Lv,Xin Xu,Guangya Hou,Huazhen Cao,Liankui Wu,Guoqu Zheng,Yida Deng
Lithium metal anode is regarded as the "holy grail" due to its extremely high specific capacity, low density and low reduction potential. However, Li dendrite growth reduces coulombic efficiency and causes safety accidents synchronously. In this paper, a rational designed three-dimensional ordered macroporous Cu is used as current collector for Li metal anode with excellent electrochemical performance, which is prepared by colloidal template method combined with copper electrodeposition . The novel porous Cu/Li anode with the pore size of 450 nm can stably run for 750 h at 0.2 mA/cm 2 with a small Li electroplating/stripping overpotential (<30 mV), and it exhibits a high coulombic efficiency of 93.3% over 120 cycles. The three-dimensional ordered macroporous structure with large specific surface area results in lower local current density and enhances electrochemical reaction kinetics, and benefits Li deposition inside pores. Especially, the Li layer on the arc area of outer pores acts as seed crystal for the subsequent Li deposition, which leads to Li uniform nucleation and dendrite suppression effectively.
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Inorganic Chemistry Frontiers
·
2018
·Vol. 5
·期 7
·1524-1532
·
IF 5.106
Jun-Hao Zhou,Da-Wei Lan,Sheng-Song Yang,Yu Guo,Kun Yuan,Lin-Xiu Dai,Ya-Wen Zhang
Bimetallic hollow structures can be efficiently used to improve the utilization of noble metals in electrocatalysts, but few studies have reported the application of bimetallic hollow nanocomposites for the electrochemical reduction of CO2. Herein, we demonstrated the synthesis of hollow Au–Cu nanoparticles of size ranging from 50 nm to 100 nm with a wall thickness of 4.95 ± 0.81 nm for efficient CO2 reduction reaction (CO2RR) via galvanic replacement and the Kirkendall effect between copper and gold. In the fabrication procedure, a gold precursor was pre-dissolved in TOP to lower the reduction potential of Au3+, which could then be reduced by Cu0. The obtained hollow Au–Cu NPs were then supported on carbon black for CO2RR measurement, and it exhibited a maximum CO FE of 53.3% at −0.7 V (vs. RHE), which was very close to that of Au NP/C, but the gold mass current density of hollow Au–Cu NP/C was much higher. The hollow Au–Cu NP/C also showed good stability in long-time measurements for CO2RR. To find out how the superior catalytic performance was achieved, hollow Au–Cu NP/C was then annealed in O2 and N2. It was found that after being annealed, the catalysts almost totally lost the activity towards CO2RR, which may be due to the partial segregation of Cu species on the nanoparticle surface as well as a decrease in the surface defect density with the improvement in crystallinity. Thus, it was concluded that high dispersion of more Au atoms on the nanoparticle surface together with the presence of more surface defect sites could account for the superior CO2RR performance of the as-synthesized hollow Au–Cu NP/C.
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