JOURNAL OF MEMBRANE SCIENCE
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2016
·
IF 5.557
He Ding,Fusheng Pan,Ena Mulalic,Hassan Gomaa,Weidong Li,Hao Yang,Hong Wu,Zhongyi Jiang,Baoyi Wang,Xingzhong Cao,Peng Zhang
In this study, Cu + and Fe 2+ ions were co-impregnated onto carbon nitride nanosheets via polydopamine chelating, and then incorporated into a Pebax matrix to fabricate the facilitated transport hybrid membranes. The homogeneously dispersed nanosheets disturb the packing of Pebax chains and render the hybrid membrane an appropriate free volume property. The existence of stabilizer Fe 2+ on Cu + Fe 2+ @CNs prevents the disproportionation and oxidation of Cu + , which is an efficient facilitated transport carrier for thiophene via π-complexation in gasoline desulfurization. Accordingly, the hybrid membranes exhibit superior desulfurization performance along with good stability even at high operation temperature. Especially, when the content of Cu + Fe 2+ @CNs is 5 wt%, the membrane achieves the optimum desulfurization performance with a permeation flux of 13.42 kg/(m 2 h) (18.76% higher than that of pure Pebax membrane) and an enrichment factor of 7.11 (28.80% higher than that of pure Pebax membrane) under 60 °C for octane-thiophene model gasoline with thiophene content of 1312 ppm. Besides, the membrane shows good stability in the long-term desulfurization under high operation temperature of 60 °C for 10 days and keeps the stability of incorporated Cu + for six months. The study offers a facile approach to enhance the carrier stability in high-performance facilitated transport membranes.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2016
·
IF 3.976
Taowu Ma,Shuangjiao Gong,Bin Tian
Copper oxide nanoparticles (CuO-NPs) may pose high ecological risks to aquatic ecosystems. While sediments are the final destinations for CuO-NPs, little is known about the potential ecotoxicity of sediment-associated CuO-NPs on freshwater deposit-feeding macroinvertebrates. The gastropod Bellamya aeruginosa was chosen as an ecotoxicological test species. Adult snails were exposed to Cu (180 μg/g dry weight (DW)) added to sediments in the form of CuO-NPs, CuO microparticles (CuO-MPs, size control), and CuSO 4 (solubility control) for 7, 14, and 28 days, Cu burdens in different tissues and biomarkers of oxidative stress were determined to understand Cu accumulation differences among tissues, potential mechanisms of Cu uptake, time-effect relationships, particle size effects, and the relative contribution of toxicity from CuO-NPs and its soluble Cu ions. There was no difference in Cu ion concentrations in porewaters between the CuO-NPs and CuO-MPs treatments. In addition, relatively low Cu ion concentrations in porewater might indicate their remarkably low solubility. The hepatopancreas and gonad of B. aeruginosa are the primary target tissues for Cu accumulation. Cu accumulation in the hepatopancreas and gonad from CuSO 4 treatments was consistently higher than that from the CuO-NPs and CuO-MPs treatments. After long-term exposure, Cu accumulation was higher from CuO-NPs than from CuO-MPs, especially, the Cu accumulation rate from CuO-NPs was greater than that from CuSO 4 . Short-term exposure to the three Cu forms caused oxidative stress to the hepatopancreas. CuO-MPs did not cause oxidative damage. Long-term exposure to CuO-NPs and CuSO 4 resulted in oxidative damage. Overall, prolonged exposure to CuO-NPs will increase the ecotoxicity risk to B. aeruginosa . Although there was no difference in Cu accumulation between the CuO-NPs and CuO-MPs treatments after 14 days of exposure, pronounced oxidative damage was caused by exposure to CuO-NPs but not to CuO-MPs, implying that toxicity of CuO-NPs could be attributed to specific nanoparticulate effects.
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MICROCHIMICA ACTA
·
2016
·Vol. 184
·期 2
·423-429
·
IF 4.831
Jiao Lei,Mu Zonggang,Miao Luyang,Du Wenwen,Wei Qin,Li He
A dual enhancing strategy has been employed to develop a sandwich type of electrochemical immunoassay for the prostate specific antigen (PSA). The signal is enhanced by using Pt-Cu hierarchical trigonal bipyramid nanoframes (HTBNFs) and a composite consisting of Fe 3 O 4 nanoparticles and reduced graphene oxide in polydopamine that serve to capture the primary antibody (Ab1). This nanocomposite shows better electrical conductivity than Fe 3 O 4 and reduced graphene oxide (RGO), respectively, alone. The Pt-Cu HTBNFs were used to label the secondary antibody (Ab2) and act as tags for signal amplification by virtue of their outstanding electrochemical reduction activity towards H 2 O 2 . At a working potential of +0.1 V (vs. SCE), the interference by dissolved oxygen can be avoided. This immunoassay is highly sensitive, with a linear range that extends from 0.1 pg⋅mL −1 to 5 ng⋅mL −1 and an ultralow detection limit of 0.03 pg⋅mL −1 .
Schematic of the dual amplification strategy in the immunosensor for the prostate specific antigen (PSA) that is based on the use of a first antibody (Ab 1 ) conjugated to a Fe 3 O 4 -reduced graphene oxide nanocomposite (Fe 3 O 4 -RGO), and of Pt-Cu trigonal bipyramid nanoframes as a label for the second antibody (Ab 2 ).
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BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Zheng-Zhe Zhang,Jia-Jia Xu,Zhi-Jian Shi,Ya-Fei Cheng,Zheng-Quan Ji,Rui Deng,Ren-Cun Jin
The increasing application of engineered nanoparticles (NPs) has posed an emerging challenge to wastewater treatment processes. The short-term impacts of CuNPs, CuONPs, ZnONPs and AgNPs on anaerobic ammonium oxidation (anammox) process were investigated firstly in this study. CuONPs, ZnONPs and AgNPs up to 50 mg g −1 suspended solid (SS) did not affect anammox activity, reactive oxygen species (ROS) production or cell membrane integrity. However, 1.25 mg g −1 SS CuNPs significantly inhibited the anammox activity and the loads that caused 50% inhibition were 4.64 ± 1.24 and 3.27 ± 0.79 mg g −1 SS for anammox granules and flocs, respectively. 5 mg g −1 SS CuNPs caused serious accumulation of the toxic intermediate N 2 H 4 . Furthermore, CuNPs interacted with extracellular polymeric substances by specifically bonding to tyrosine or tryptophan-containing groups, C-O-C in polysaccharides and –OH in polymeric compounds. Therefore, this study calls for more attention to the risks of NPs to the anammox-based processes.
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RSC Advances
·
2017
·Vol. 7
·期 29
·17873-17881
·
IF 3.108
Piyong Zhang,Ting Song,Tingting Wang,Heping Zeng
A broad spectrum absorption photocatalytic system has been expected for a long time, especially for catalysts where the absorption mainly concentrates on the ultraviolet region, like TiO2. Here, dye sensitization was used to realize this expectation for TiO2. Anatase TiO2 was prepared by a hydrothermal method and then modified with Cu nanoparticles (NPs) by chemical reduction reaction. The highest H2 production rate was 3.33 mmol g−1 h−1 for Cu(3%)–TiO2 (content of Cu NPs was 3 wt%) and for pure TiO2 was only 0.356 mmol g−1 h−1. Next, the Cu(3%)–TiO2 photocatalyst was sensitized with various amounts of Erythrosin B (ErB) and the highest H2 production rate was 13.4 mmol g−1 h−1 with 3 mg of ErB in the photoreaction system. Under monochromatic light irradiation (500, 550, 600 and 650 nm), no photocatalytic activity was detected for Cu(3%)–TiO2 and some photocatalytic activities were obtained for sensitized Cu(3%)–TiO2, indicating that ErB sensitization can extend the visible light harvesting ability efficiently. Through photoelectrochemical analysis, electron–hole separation and transfer processes were promoted significantly by modification with Cu NPs and then sensitization by ErB. A possible ErB sensitization mechanism is proposed between ErB and Cu–TiO2 for the improvement of the photocatalytic activity.
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Journal of the Iranian Chemical Society
·
2016
·Vol. 14
·期 1
·111-119
·
IF 1.3
Yang Xiaomei,Fu Xiaomin,Bu Ningning,Han Li,Wang Jianfeng,Song Chengying,Su Yunlai,Zhou Lipeng,Lu Tianliang
Cu–Ni/γ-Al 2 O 3 bimetallic catalysts were developed for anaerobic dehydrogenation of non-activated primary aliphatic alcohols to aldehydes. Systematic investigation about the promotion effect of nickel on the catalytic performance was carried out. Hydrogenation of C=C bond rather than C=O bond, was significantly improved over Cu–Ni/γ-Al 2 O 3 catalyst by introducing nickel, which interprets the good conversion of primary aliphatic alcohols. This work would contribute to design new catalysts for dehydrogenation of primary aliphatic alcohols.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Changyan Zhou,Huiping Zhang,Ying Yan,Xinya Zhang
The technique -- chemical vapor deposition (CVD) is known for its atom economy, simple preparation steps in catalyst preparation as well as high catalytic activity of the catalysts made by this method and was applied to the preparation of copper modified catalysts supported on Linde Type A zeolite membrane/paper-like stainless steel fibers (LTA/PSSF) in this work. A series of catalysts were prepared for acetone oxidation . Several techniques were carried out to characterize the catalysts including X-ray diffraction (XRD), scanning electron microscope (SEM), energy disperse X-ray spectrometer (EDS) mapping, X-ray photoelectron spectrum (XPS), N 2 adsorption and desorption isotherms as well as H 2 -temperature programmed reduction (H 2 -TPR). The results of the SEM showed that the zeolite membrane grew successfully on the surface of PSSF support, and the EDS illustrated that the copper oxides coated on the support materials uniformly. The Cu/LTA/PSSF catalyst prepared by CVD was tested in a zeolite membrane reactor . The experimental results revealed that higher loading results in better catalytic activity as the 10% Cu/LTA/PSSF-CVD presented the highest catalytic activity in acetone oxidation (90% of acetone converted at 300 °C) when compared with 5% Cu/LTA/PSSF-CVD (322 °C) and 1% Cu/LTA/PSSF-CVD (305 °C). The CVD method is proved to be a feasible and powerful way to prepare the catalyst. The experimental results suggested that the T90 of the 10% Cu/LTA/PSSF-CVD is slightly higher than that of 10% Cu/LTA/PSSF- impregnation (IM, 310 °C) and much better than that of granular Cu/LTA catalyst (346 °C), though the T50 (268 °C) is slightly lower than 10% Cu/LTA/PSSF-IM (260 °C).
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ACS Catalysis
·
2016
·
IF 9.307
Jie Sun,Qiuxia Cai,Yan Wan,Shaolong Wan,Li Wang,Jingdong Lin,Donghai Mei,Yong Wang
The promotional effects of a cesium promoter on higher alcohol (C2+OH) synthesis from syngas over Cs2O-Cu/ZnO/Al2O3 catalysts were investigated using a combined experimental and density functional theory (DFT) calculation method. In the presence of a cesium promoter, the C2+OH productivity increases from 77.1 to 157.3 g kgcat–1 h–1 at 583 K due to the enhancement of the initial C–C bond formation. A detailed analysis of chain growth probabilities (CGPs) confirms that initial C–C bond formation is the rate-determining step in the temperature range of 543–583 K. Addition of a cesium promoter significantly increases the productivities of 2-methyl-1-propanol, while the CGP values (C3* to 2-methyl-C3*) are almost unaffected. With the assistance of a cesium promoter, the CGPs of the initial C–C bond formation step (C1* to C2*) increase from 0.13 to 0.25 at 583 K. DFT calculations indicate that the initial C–C bond formation during syngas synthesis over the ZnCu(211) model surface is mainly due to the HCO + HCO coupling. In the presence of Cs2O, the stabilities of key intermediates such as HCO and H2CO are enhanced, which facilitates both HCO + HCO and HCO + H2CO coupling steps with lower activation barriers. In addition, Bader charge analysis suggests that the presence of cesium ions could facilitate nucleophilic coupling between HCO and H2CO for the initial C–C bond formation.
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JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Qinghua Xu,Yulu Wang,Liqiang Jin,Yu Wang,Menghua Qin
A novel nanocomposite based on black wattle (BW) tannin and nanocellulose was prepared and applied in heavy metal ions adsorptive removal from aqueous solutions. Firstly, nanocrystalline cellulose was oxidized by sodium periodate to get dialdehyde nanocellulose (DANC). BW tannin was then covalently immobilized onto DANC, which was used as both the matrix and crosslinker, to obtain tannin-nanocellulose (TNCC) composite. The resulting nanocomposite was characterized using FTIR, AFM, and TG. The successful immobilization was confirmed by the chromogenic reaction between FeCl 3 and TNCC and FT-IR analysis. AFM images revealed that TNCC was ellipsoidal particles with lengths ranging from 100–400 nm. Zeta potential measurement showed that TNCC was negative charged at a pH range from 1–12. Compared to the original tannin, the thermal stability of TNCC was slightly increased by the addition of nanocellulose. TNCC demonstrated the maximum adsorption efficiency at pH 2 for Cr(VI) and pH 6 for Cu(II) and Pb(II), respectively. The adsorption for these three metal ions followed pseudo second-order kinetics, indicating the chemisorption nature. The adsorption isotherms all fitted well with the Sips model, and the calculated maximum adsorption capacities were 51.846 mg g −1 , 53.371 mg g −1 and 104.592 mg g −1 for Cu(II), Pb(II) and Cr (VI), respectively.
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VACUUM
·
2024
·
IF 3.8
Xingtao Cheng,Yi He,Siming Yan,Ruxia Song,Zhiyuan Li,Liping Yan,Hongjie Li,Kaijun Wei,Qing Yuan,Shijun Xu
In this study, a pulsed electrodeposition approach was used to create a Ni-Cu/ZrB 2 composite coating on the surface of J55 steel. Ni-Cu/ZrB 2 composite coatings with different material additions were prepared, and the surface morphology, grain size, microhardness and wear and corrosion resistance were investigated. The results confirmed that the embedding of ZrB 2 in the Ni-Cu coating can refine the grains and make the coating surface denser. Furthermore, ZrB 2 can effectively increase the wear resistance and corrosion resistance of the coating; the Ni-Cu/ZrB 2 (1.0 g/L) composite coating reflects this by having the shallowest and narrowest wear cross-section as well as the lowest average friction coefficient (0.537). Additionally, the composite coating has the highest impedance modulus, reaching 83.60 kΩ/cm 2 . The composite coating improved corrosion resistance by 63.1 % compared to the pure sample. The enhancement in the coating's corrosion resistance can be attributed to three factors. Firstly, the addition of zirconium diborate refines the coating grain and changes the corrosion type from pitting corrosion to homogeneous corrosion. Secondly, zirconium diborate forms a physical barrier against corrosive ions. Lastly, the formation of the oxide layer on the coating during the process of corrosion, also enhances the material's resistance to corrosion.
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THERMOCHIMICA ACTA
·
2024
·
IF 3.1
Jiaming Liu,Xinwen Ma,Wenhao Wang,Weiduo Fei,Xiandie Zhang,Xiang Ke,Xiang Zhou
In this study, Cu(OH)F nanoparticles are prepared through a simple hydrothermal reaction and their effects on the thermal oxidation and ignition characteristics of micron-sized Al powder (μ-Al) are explored for the first time. Thermal analysis in air atmosphere (50∼1050 °C) shows that compared to raw μ-Al, the normalized weight gain of Al in Al-Cu(OH)F increases by about 36.9%, 64.8%, and 106.3% when the added Cu(OH)F is 1 wt%, 3 wt%, and 5 wt%, respectively. After mixed with NH 4 ClO 4 , electric ignition and open-air combustion tests show shortened ignition delay time (by 42.6%∼63.8%) and increased maximum light intensity (by 48.9%∼117.8%) for Al-Cu(OH)F. The effects of Cu(OH)F result from its decomposition products, namely, HF and CuO. HF reacts with alumina shell to form AlF 3 , which sublimes at high temperature and thus exposes Al core instantly, while CuO can react with Al core to release heat, further facilitating the thermal oxidation and ignition processes.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Wenjing Yang,Hexue Jia,Tingting Li,Yuepeng Liu,Yi Li
Superoxide radicals (·O 2 − ) has been regarded as one of the reactive oxygen species (ROS) for the elimination of complex contaminants via electro-Fenton like (EF-like) technology. However, the generation path of ·O 2 − is diverse, and the influence of the physicochemical properties of metals on the mechanism of ·O 2 − conversion is significant in the EF-like treatment of wastewater. Herein, metals (M = Mn, Cu) loaded zeolitic imidazolate frameworks catalytic materials (M–NC) were prepared for sulfamethoxazole (SMX) removal to analyze the effect of metals on the pathways of ·O 2 − generation. The removal kinetic rate of SMX by Cu–NC was 1.32 times higher than that of Mn–NC. Quenching experiments demonstrated that ·O 2 − is the most important oxidizing species to achieve SMX removal. The RRDE measurements and quantitative experiment on the concentration of H 2 O 2 experiments indicated that Mn–NC was more inclined to generate ROS through activation of H 2 O 2 and Cu–NC through other ways. Therefore, the transformation pathways of ·O 2 − in different catalytic systems were thoroughly analyzed. Electron paramagnetic resonance test and reactive oxygen species quenching experiments indicated that the pathway for ·O 2 − production of Mn–NC was O 2 → H 2 O 2 → ·O 2 − , and that of Cu–NC was O 2 → ·O 2 − . The strategy of using Mn and Cu-based catalysts to investigate the mechanism of the ·O 2 − generation pathway provided a way to efficiently utilize the conversion of ·O 2 − .
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