JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Jiaxin Zhu,Jinyan Xiong,Gang Cheng,Weijie Li,Shixue Dou
Developing a highly efficient photocatalysis system based on a photocatalyst-cocatalyst host for the hydrogen evolution reaction has potential but is still challenging. Herein, we report enhanced splitting of water achieved by loading copper metal particles on mesoporous TiO 2 microrods through involving of dual ligand agents into the reaction system. The composition , structure, and surface characteristics of the TiO 2 -Cu hybrid were analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, scanning and transmission electron microscopy , and nitrogen adsorption . The formation of a Schottky contact in the interface between the Cu metal and the n -type semiconductor TiO 2 was confirmed experimentally by photo/electrochemical measurements. This Schottky junction, the TiO 2 -Cu hybrid photocatalyst , exhibited superior hydrogen evolution capability with rate of 6046 μmol g −1 h −1 , which is 23 times higher than that of pristine TiO 2 (260 μmol g −1 h −1 ). The experimental results demonstrated that efficient separation and transfer of photo-induced electron-hole pairs greatly contributed to the enhanced photocatalytic H 2 evolution. The Schottky contact between Cu and TiO 2 as well as cocatalyst characteristic of Cu play significant roles in preventing the recombination of electron-hole pairs and enhancing water splitting to form hydrogen. This study demonstrates a rational design to construct Schottky contacts in metal-semiconductor junctions to significantly boost their photocatalytic capacity.
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JOURNAL OF RARE EARTHS
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2019
·
IF 2.846
Dingwen Kang,Jie Yu,Wenhui Ma,Min Zheng,Yunfei He,Pengfei Li
In this study, Cu/Ni-La 0.7 Sr 0.3 Cr 0.5 Mn 0.5 O 3– δ (LSCM) catalysts were synthesized via the citric acid-nitrate process (CNP) and chemical co-precipitation. The catalytic performance of Cu/Ni-LSCM catalysts on dry methane reforming was evaluated in a fixed-bed reactor at 550/650 °C and atmosphere pressure. Cu/Ni loading was investigated as an influencing factor, which led to 5 cases of samples according to the different Cu/Ni mass ratios. The catalysts were characterized by X-ray diffraction (XRD), field emission-scanning electron microscope (FE-SEM), Brunauer-Emmett-Teller (BET) measurement, X-ray photoelectron spectroscopy (XPS), hydrogen-based temperature-programmed reduction (H 2 -TPR) and thermos gravimetric analyzer (TGA). The results show that the methane conversion increases, the resistance against metal sintering increases and the carbon deposition drops after the copper is introduced. This optimum performance can be obtained under Case 3 (Cu:Ni:LSCM = 1:3:6 in mass ratio).
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CHEMOSPHERE
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2019
·
IF 5.108
Jingchun Yan,Yudong Chen,Weiguo Gao,Yun Chen,Linbo Qian,Lu Han,Mengfang Chen
A high catalytic system using Cu layered double hydrotalcite (Cu(II)-Mg(II)-Fe(III)LDHs) and hydrogen peroxide (H 2 O 2 ) was developed for the degradation of ethylbenzene. It was identified that the degradation efficiency of ethylbenzene (0.08 mmol L −1 ) and TOC removal were 96.1% and 39.7% respectively in the presence of 0.1 g L −1 Cu(II)-Mg(II)-Fe(III)LDHs with (Cu 2+ + Mg 2+ )/Fe 3+ molar ratio of 5.0 and 0.16 mmol L −1 H 2 O 2 in 6.0 h. Based on ESR and XPS data, hydroxyl radicals (•OH) were the predominant free radical specials generated from the catalytic decomposition of H 2 O 2 for the degradation of ethylbenzene. The redox of Cu(II)/Cu(III) on the layered Cu(II)-Mg(II)-Fe(III)LDHs surface active sites accounted for the formation of •OH radicals and the cycle of Cu(II) in the Cu(II)-Mg(II)-Fe(III)LDHs/H 2 O 2 system were proposed.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
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IF 4.784
Hong Zhang,A.M. Omer,Zhaohong Hu,Li-Ye Yang,Chao Ji,Xiao-kun Ouyang
In this work, composite hydrogel beads based on magnetic bentonite/carboxymethyl chitosan/sodium alginate (Mag-Ben/CCS/Alg) were fabricated and their ability to adsorb copper ions in water was studied. The structure and properties of the composite were characterized via SEM, FTIR, XPS, TGA , VSM, and Zeta potential tests. The effects of the adsorbent dosage, adsorption time, pH, temperature, and initial concentration of Cu(II) on the adsorption results were studied. The results showed that Mag-Ben/CCS/Alg reached equilibrium after 90 min of adsorption, the removal rate of Cu(II) was 92.62 ± 0.39%, and the maximum adsorption capacity was 56.79 mg/g (30 °C). The removal rate of Cu(II) by Mag-Ben/CCS/Alg still remained above 80% after recycling four times. The adsorption process of Cu(II) by Mag-Ben/CCS/Alg occurred in accordance with the quasi-second-order kinetic model and Langmuir adsorption isotherm. The adsorption process was spontaneous and endothermic.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2019
·Vol. 125
·期 6
·1-10
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IF 1.784
Zhou Jinxuan,Zhang Zhibin,Yu Xiaofeng,Shi Xueting,Feng Libang
Abstract The superhydrophobic materials have generated wide interest due to the broad application prospect. However, the superhydrophobicity of artificial superhydrophobic surfaces is easy to lose and which has caused widespread concern. In this work, Cu-based superhydrophobic materials with self-similarity in texture and composition both externally and internally were fabricated using a facile and environment-friendly approach. The as-prepared Cu-based materials not only behave excellent superhydrophobicity, but also show outstanding repellence universality to various liquids, excellent UV resistance and storage stability, and wide pH toleration. More importantly, the as-prepared samples present outstanding superhydrophobicity regenerability once the superhydrophobicity has been destroyed by abrasion, scratch, or fouling. In addition, the Cu-based superhydrophobic materials take on excellent self-cleaning performance and pollutants are difficult to adhere onto the material surfaces. Even if some pollutants have adhered onto the surfaces, they can be cleaned up easily by rolling water droplets. Graphic abstract The superhydrophobic Cu-based materials with self-similarity in texture and composition both externally and internally were prepared. The as-prepared superhydrophobic materials show outstanding repellent universality to various liquids, excellent UV resistance and storage stability, wide pH toleration, and self-cleaning performance. More importantly, the block materials present outstanding superhydrophobicity regenerability once the surfaces have been destroyed by abrasion, scratch, or fouling.
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NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 17
·6772-6780
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IF 3.069
Yuxi Meng,Hanyu Gao,Shuang Li,Fang Chai,Lihua Chen
Herein, high efficiency and recyclable Cu–Ag hybrid catalyst (Trp–Cu–Ag) NPs were prepared by the hydrothermal method using L-tryptophan as a reducing agent and protecting reagent. The structure, morphology and catalytic properties of the Trp–Cu–Ag NPs were investigated in detail. The binary Trp–Cu–Ag NPs were assembled using Trp–Cu nanosheets and Ag nanoparticles through a one-step process. The developed Trp–Cu–Ag NPs show excellent catalytic performance in the reduction of nitrophenols (4-nitrophenol, 2-nitrophenol and 3-nitrophenol). Meanwhile, the Trp–Cu–Ag NPs exhibited a stable conversion efficiency of over 95% for more than 10 recycles in the reduction of 4-nitrophenol. The binary Trp–Cu–Ag NPs can also catalytically reduce K3(Fe(CN)6) in the presence of a NaBH4 aqueous solution with high efficiency. All in all, the obtained Trp–Cu–Ag NPs show potential as a catalyst in practical environmental protection applications due to their cost-effective and recyclable features.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Xiyang Liu,Fei Huang,Yang Yu,Peng Zhao,Yuanbo Zhou,Yide He,Yanhua Xu,Yongjun Zhang
In this study, the degradation of ofloxacin (OFX) over Cu–Ce tyre carbon catalysts by the microwave assisted persulfate process was examined for the first time. The results showed that the Cu–Ce tyre carbon catalysts dramatically improved OFX decay efficiency. The optimal reaction conditions were the Cu–Ce tyre carbon catalysts of 2.0 g/L and the persulfate dosage of 12.0 g/L under microwave power of 400 W at 60 °C. The OFX conversion and total organic carbon (TOC) removal reached 95.8% and 87.6%, respectively, after 60 min catalytic oxidation under optimal conditions. To identify the properties of Cu–Ce tyre carbon catalyst, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), the Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and the ultraviolet–visible (UV–vis) diffuse reflectance spectra studies have been carried out. Eleven kinds of degradation products and five pathways during degradation process of OFX and degradation products were identified by GC–MS and HRMS.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2019
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IF 4.527
Peng Gu,Qi Li,Weizhen Zhang,Zheng Zheng,Xingzhang Luo
Eastern China is a typical region that suffers from harmful cyanobacterial blooms. Numerous studies have focused on bloom formation mechanisms; however, the detailed mechanisms remained unclear. Our study explored the influence of four metal ions (Ca, Cu, Pb and Cd) on Microcystis aeruginosa to determine their effects on bloom formation. We found that Ca concentrations higher than 100 mg L −1 contributed to cyanobacterial bloom formation. The presence of Ca triggered the anti-oxidation process and promoted the secretion of extracellular polysaccharides , thus inducing aggregation of algal cells and enhancing their buoyancy 2.1-fold more than the control ( p ＜0.05). The reverse regulation of dissolved CO 2 to bicarbonate by carbonic anhydrase formed a large amount of carbonate and decreased the growth rate by 38–56%. Cu (>0.1 mg L −1 ) presented significant toxicity to algal cells while Pb (>1 mg L −1 ) suppressed the algal growth rate due to the acidic condition. Cd (<0.1 mg L −1 ) exhibited no apparent toxicity to the algae. Furthermore, as the buoyancy increased, Cd was likely to facilitate the formation of cyanobacterial blooms, which needs further research. These findings can provide a theoretical basis for eutrophic lake management and contribute to the development of water quality and wastewater discharge standards.
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HIGH PERFORMANCE POLYMERS
·
2018
·
IF 1.047
Ting Li,Zengxiao Wang,Junrong Yu,Yan Wang,Jing Zhu,Zuming Hu
In this article, active groups were introduced to the surface of aramid fiber by building a Cu2+ bridge between the aramid fiber and polyethyleneimine (PEI) to improve adhesion in composites between the aramid fiber and the matrix such as epoxy resin. The changes in the structure and properties of the aramid fiber were verified with Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and the single-fiber pull-out test. The FTIR and XPS results show a significant change in the structure and morphology of the aramid fiber after modification. The results of the single-fiber pull-out test show that the interfacial shear strength (IFSS) of epoxy composites reinforced with PEI-grafted aramid fiber increases by 48.8% compared with the IFSS of epoxy composites reinforced with untreated fiber. Thus, the proposed method can improve the interfacial bonding of composites by creating a copper ion bridge between the aramid fiber and PEI.
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FUEL
·
2018
·
IF 4.908
Yun-Chuan Pu,Shui-Rong Li,Shuai Yan,Xiao Huang,Duo Wang,Yue-Yuan Ye,Yun-Quan Liu
Copper sintering at temperatures above 200 °C has been a big challenge for the application of copper-based catalysts in methanol reforming for hydrogen production. In the present work, a Cu/ZnO catalyst promoted by Sc 2 O 3 was developed, which is capable of converting methanol into hydrogen-rich gas with good activity and decent stability in the temperature range of 220–600 °C. The role of Sc in Cu/Sc 2 O 3 -ZnO catalysts was explored through the XRD, H 2 -TPR, N 2 O chemisorption, TEM, Raman, and XPS analyses. The results indicated that ZnO lattice was doped with the Sc 3+ ion, which led to increased metal dispersion, strengthened interaction between Cu metal and support oxide, and subsequently enhanced catalytic activity and stability of the Cu/Sc 2 O 3 -ZnO catalyst in methanol reforming for hydrogen production.
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ChemCatChem
·
2018
·Vol. 10
·期 18
·4010-4017
·
IF 4.674
Kui Ma,Zhonghui Cui,Zhitao Zhang,Jingjing Huang,Zhirui Sun,Ye Tian,Tong Ding,Xingang Li
Graphical Blowing off steam : This paper describes a new approach of designing Cu−Ni bimetallic catalytic systems for dimethyl ether/methanol steam reforming. The Cu−Ni system exhibits an interesting alloy-mediated selectivity of CO and CH 4 , thereby producing hydrogen-rich reformates with an ultra-low CO concentration (<1000 ppm), which could be commercially potential for fuel cells. Steam reforming of simple oxygenated hydrocarbons without C−C bonds is suitable for small-scale decentralized H 2 production for fuel cells. However, the relatively high CO concentration in H 2 -rich reformates produced by traditional Cu-based catalysts will poison the Pt-based anode in fuel cells. Here, we describe a new approach to the design of Cu−Ni bimetallic catalysts based on nickel-phyllosilicate for steam reforming of dimethyl ether (DME). With the tunable formation of the Cu−Ni alloy, we can modulate the selectivity of CO and CH 4 in steam reforming and achieve H 2 -rich reformates with an ultra-low concentration of CO (below 1000 ppm). This process only requires simple and low-energy purification pretreatments to meet the requirements of commercial fuel cells. Mechanistic studies reveal that the Cu−Ni alloy can adsorb CO, particularly at high temperatures, and simultaneously suppress CO dissociation to methane.
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APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Shaozhong Li,Yu Wang,Bin Yang,Limin Guo
Mesostructured catalysts with optimized microstructure and surface properties endowed them attractive catalytic performance. Herein, the mesostructured AlCeO supports with different weight ratio of Al 2 O 3 and CeO 2 have been prepared on the basis of a self-assembly sol-gel process, then 15 wt.% Cu was loaded onto the mesostructured AlCeO supports by incipient wetness impregnation method. The mesostructured AlCeO supports with varied ratio of Al 2 O 3 to CeO 2 resulted in the very different Cu particle size, and for the optimized catalyst Cu/AlCeO-7 (the amount of Al 2 O 3 in AlCeO support was 70 wt.%), the Cu crystal size was around 7 nm based on the characterization of XRD and TEM. The Cu/AlCeO-7 catalyst had strong metal-support interactions (SMSI) and more Cu-ceria interface, which was confirmed by the XPS. Furthermore, the Cu/AlCeO-7 catalyst showed the highest exposed Cu surface area ( S Cu ) (25.5 m 2 /g cat ) from the analysis results of H 2 -TPR and dissociative chemisorption of nitrous oxide. The CO 2 -TPD results demonstrated the Cu/AlCeO-7 had strong surface basicity. Hence, Cu/AlCeO-7 catalyst showed the highest space time yield of methanol (STY MeOH ). The CO 2 conversion (Cu/AlCeO-7, V(H 2 )/V(CO 2 ) = 3/1, GHSV = 6000 mL h −1 g −1 and P = 4 MPa) was up to 22.5% at 553 K, the methanol selectivity can reach 94% at 473 K, and the STY MeOH was up to 7.2 mmol g cat. -1 h -1 at 493 K. The as-prepared mesostructured Cu/AlCeO-7 exhibited a promising catalyst candidate for CO 2 hydrogenation to methanol.
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