ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Ping Zhang,Deyi Hou,David O’Connor,Xuanru Li,Simo Pehkonen,Rajender S. Varma,Xun Wang
Many challenges remain for the mass production of nanoparticles for the removal of contaminants from water, primarily due to the complexity of the synthetic protocols involved and the use of hazardous reagents. Although the development of phytosynthetic methods for the green fabrication of nanomaterials have seen keen interest, there remains much scope for improvement in terms of maximizing adsorption capacity and controlling the size of the nanoparticles produced. A green and sustainable pathway is described using Virginia creeper (Parthenocissus quinquefolia) leaf extract in the presence of oxalic acid for the synthesis of earth abundant Fe,Cu-based nanoparticle adsorbents. This optimized green method could produce Fe,Cu-based nanoparticles with a remarkably high maximum adsorptive capacity (1399 mg g–1) for aqueous Malachite Green (MG) removal. Furthermore, various particle sizes (between 160 and 1000 nm) were attained by simply varying the amount of oxalic acid. The synthesized adsorbent displayed other excellent characteristics, including (i) maintaining a high adsorption capacity over a wide range of pH conditions, (ii) remaining chemically stable under an ambient storage environment, and (iii) having good recycling potential, with consistent removal efficiency observed over four adsorption/desorption cycles. This work not only promotes the use of natural, earth-abundant, and renewable resources in synthesizing novel and efficient absorbents but also provides a simple, convenient, and cost-effective strategy for the purification of dye-laden wastewater.
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MICROCHIMICA ACTA
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2018
·Vol. 185
·期 8
·1-5
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IF 5.705
Ni Pengjuan,Chen Chuanxia,Jiang Yuanyuan,Zhao Zhenlu,Lu Yizhong
A fluorometric assay is described for sulfide ions determination. It is based on the finding that the oxidation of the non-fluorescent substrate thiamine (TH) by Cu(II) in basic solution to form fluorescent thiochrome is inhibited by sulfide ions. This results in a decrease in fluorescence intensity which is proportional to the concentration of sulfide ions. Under the optimized conditions, the decrease in fluorescence, best measured at excitation/emission wavelengths of 370/440 nm, decreases linearly in the 0.03 to 2.5 μM sulfide ions concentration range. The detection limit is 20 nM. The method shows excellent selectivity over many potentially interfering ions and has been successfully applied to the determination of sulfide ions in spiked tap water, lake water and the synthetic wastewater samples. The method is time-saving and environmentally friendly, and in our perception shows a great potential in water quality inspection and environmental monitoring.
A fluorescent assay for sulfide ions detection is proposed based on its inhibitory effect on the oxidation of thiamine by Cu(II) ions.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2018
·Vol. 94
·期 1
·167-177
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IF 2.587
Xuejuan Cao,Junnan Wei,Huai Liu,Xinyue Lv,Xing Tang,Xianhai Zeng,Yong Sun,Tingzhou Lei,Shijie Liu,Lu Lin
BACKGROUND γ-Valerolactone (GVL) is a versatile biomass-derived platform molecule that could serve as a building block to produce chemicals, materials and fuels, but the production of GVL from biomass via a cost-competitive method is challenging. In this contribution, a robust Cu─Mg oxide was prepared as an efficient bifunctional catalyst for both H 2 production by MeOH reforming and hydrogenation of methyl levulinate (ML) to GVL in MeOH medium. RESULTS Cu 0.87 Mg 0.13 O x prepared by a urea hydrolysis method offered a GVL yield up to 90.6% at 220°C in 4 h without external hydrogen. This catalyst could be reused for at least seven consecutive cycles without loss of its activity. Notably, Cu 0.87 Mg 0.13 O x also provided nearly 70% GVL yield in methanolysis products of cellulose in the presence of humins. Characterization of the catalyst indicates that the incorporation of MgO greatly facilitates the stabilization of Cu + species that possess a better catalytic performance in ML hydrogenation compared with metallic Cu. CONCLUSION This robust Cu 0.87 Mg 0.13 O x could greatly contribute to develop a highly facile and desirable two-step strategy for GVL production from cellulose, through the integration of ML production by methanolysis of cellulose, H 2 formation by MeOH reforming and ML hydrogenation in MeOH medium. © 2018 Society of Chemical Industry
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BIOSENSORS & BIOELECTRONICS
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2018
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IF 8.173
Kangyao Zhang,Shuzhen Lv,Minghua Lu,Dianping Tang
In this work, a new “signal-on” split-type photoelectrochemical (PEC) sensing platform for prostate-specific antigen (PSA) detection was successfully constructed using p-type Cu-doped Zn 0.3 Cd 0.7 S as the photosensitive semiconductor material and target-triggered rolling circle amplification (RCA) for signal amplification . The signal derived from Cu-doped Zn 0.3 Cd 0.7 S was amplified by hemin/G-quadruplex. Upon target PSA introduction, the aptamer-primer probe (apt-pri) was captured by capture antibody-conjugated magnetic bead (MB-mAb) to form the sandwiched MB-mAb/PSA/apt-pri. The complex could initiate the RCA reaction to produce a long single-stranded DNA that provided binding sites for G-rich DNA and to form long single-stranded DNA/G-quadruplex/hemin. Upon the addition of exonuclease III (Exo III), the hemin/G-quadruplex immobilized on the RCA long product could be released by the digestion of Exo III. The hemin/G-quadruplex complexes in this study were used as efficient electron acceptors to neutralize the photoelectrons generated from the semiconductor and hindered the recombination of charges, thus enhancing the photocurrent . Under the optimum conditions, the developed sensing system displayed a good analytical performance with a linear range of 0.05–40 ng mL −1 PSA and a detection limit of 16.3 pg mL −1 . Furthermore, good selectivity , high anti-interference ability, satisfactory reproducibility, and good accuracy were also achieved. These prominent analytical properties revealed that our strategy might be a potential and reliable tool for the detection of PSA.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Ni Xiong,Rui Bao,Jianhong Yi,Dong Fang,Jingmei Tao,Yichun Liu
CNTs/Cu-Ti composites were fabricated successfully by spray pyrolysis , low energy ball milling and subsequent hot pressing (HP). Microstructure and mechanical properties of the composites were characterized by SEM, EDS, HRTEM , XRD, hardness and tensile tests. The results reveal that in situ generated nano-TiC particles, as a transition phase from CNTs to Cu-Ti matrix, which played a “rivet” role in enhancing the interfacial bonding between the CNTs and Cu-Ti matrix is formed in the composites. Consequently, mechanical properties of the CNTs/Cu-Ti composites are enhanced compared with alloy matrix, and an optimal balance between elevated ultimate tensile strength and impressively larger plastic deformation is achieved by adding 0.4 wt% CNTs in the composites. (ultimate tensile strength (UTS) 352 MPa, elongation 28.2%, the UTS is 39% higher than that of the Cu-Ti alloy, and the ductility increased significantly by 62%.) Finally, strengthening and toughening mechanisms are discussed. This study provides new insights into the interface structure and strength-ductility in metal-matrix composites.
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Nanoscale
·
2018
·Vol. 10
·期 34
·15932-15937
·
IF 7.233
Feng Wang,Jian Lin,Hongye Wang,Shansheng Yu,Xiaoqiang Cui,Asghar Ali,Tao Wu,Yang Liu
Herein, the ECL behaviors of precise mono-Cu+ ion doped Cd–In–S supertetrahedral chalcogenide nanoclusters (Cu@CdInS NCs) were investigated, and the effect of mono-Cu+ ions at the vacancy site of NCs on ECL emission performance was also elucidated. Precise mono-Cu+ ion doping not only induced new ECL emission at 596 nm with enhanced efficiency as high as 21.72% relative to [Ru(bpy)3]2+, but also improved acid tolerance of the ECL performances of NCs. In addition, a simple, fast and label-free dopamine ECL sensor with excellent selectivity was achieved.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 12
·8269-8275
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IF 1.354
Wang Manchao,Peng Lin,Wang Jiahui,Li Changqing,Guan Lihao,Lin Yuqing
In this study, hierarchical ternary nanocomposites, i.e., Cu–TiO2-mesoporous silica microspheres (Cu–TiO2-MSM), were synthesized as ternary photocatalyst system to improve the visible light photocatalytic degradation of the environmental pollutant model
dye methylene blue (MB). The innovation of this method is in situ depositing TiO2 and Cu2O nanoparticles sequentially onto the surface of mesoporous silica microspheres to form highly active heterostructure. The improved activity for the degradation of MB is attributed
to: (1) the high adsorption capacity of the porous and interconnected-channel-structure MSM to MB; (2) the valence band electrons of TiO2 released from the conduction band generating abundant highly active free radicals, which directly reacted with adsorbed MB. The photocatalytic
degradation efficiency to MB was found to be 98% in 5 min, and almost 100% in 20 min. This study paves a way for the development of a ternary-doped catalyst for visible light photocatalytic degradation and may exhibit widely application in industry.
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APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Linan Wang,Shuxian Zhuang,Liu Wang,Na Wang,Hengliang Mo,Yang Tang,Yongmei Chen,Yanzhi Sun,Pingyu Wan
Co(OH) 2 nanoflakes integrating with Cu nanoparticles were deposited on nickel foam (CuNps-Co(OH) 2 Nfs/Ni f ) by a green and facile one-step deposition method and used for non-enzymatic glucose sensors. The CuNps-Co(OH) 2 Nfs/Ni f composite was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and high resolution transmission electron microscopy. Electrochemical oxidation of glucose on the CuNps-Co(OH) 2 Nfs/Ni f composite was investigated by chronoamperometry and cyclic voltammetry. The prepared CuNps-Co(OH) 2 Nfs/Ni f electrode shows not only an extremely high sensitivity of 42.7 mA mM −1 cm −2 in the concentration range from 1 to 250 μM for glucose detection but also an obvious current response to glucose at a level of 1 μM with a low detection limit of 73 nM (S/N = 3). Moreover, the glucose sensor based on CuNps-Co(OH) 2 Nfs/Ni f also exhibits high recovery ratio toward real sample analysis. This work indicates that the fast electron transfer, large surface area, and highly effective active sites based on the hierarchical structure of ultra-thin and open-interlaced Co(OH) 2 Nfs interspersed by CuNps contribute to the excellent performance of CuNps-Co(OH) 2 Nfs/Ni f electrodes. The proposed one-step preparation of hierarchical nanostructure of CuNps and Co(OH) 2 Nfs provides a promising and efficient strategy in the development of outstanding non-enzymatic glucose biosensors.
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ELECTROCHIMICA ACTA
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2018
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IF 5.116
Yue Song,Tianran Sun,Long Cang,Song Wu,Dongmei Zhou
Further research into more cost-effective methods to treat toxic metal-ethylenediaminetetraacetate (Me-EDTA) complexes is required due to their high bioavailability. In this study, we compared electrodialysis (ED) with different compartment designs (2-, 3- and 4-compartment designs) and electrochemical oxidation (EO, 1-compartment design) to treat a dilute Cu(II)-EDTA solution (1 mM). After a 48-h treatment with a constant current applied at 32 mA, the Cu removal efficiencies were achieved at 49%, 87%, 79% and 96% for 1-compartment EO and 2- to 4-compartment ED, respectively, and the total organic carbon concentrations decreased from 138 mg/L to 100, 64, 57 and 39 mg/L, respectively. The energy consumptions for 1-compartment EO and 2- to 4-compartment ED were 7.7, 8.4, 13.9 and 15.4 W h, respectively. Based on all above results, the most cost-effective design was determined to be the 2-compartment ED. Moreover, the 3- and 4-compartment ED treatments have faster contaminant removal kinetics than 1-compartment EO and 2-compartment ED. This study clarified the mechanisms of the migration and the transformation of Cu-EDTA during EO and ED with different membrane combinations, which is helpful for improved selection of compartment design for metal-chelate complex removal.
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Journal of Environmental Sciences
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2018
·
IF 3.12
Rong Cheng,Mi Kang,Zhi-peng Shen,Lei Shi,Xiang Zheng
Pathogenic viruses in drinking water are great threats to public health. Visible-light-driven photocatalysis is a promising technology for virus inactivation. However, the existing photocatalytic antiviral research studies have mostly been carried out in single-component systems, neglecting the effect of natural organic matter, which exists widely in actual water bodies. In this paper, electrospun Cu-TiO 2 nanofibers were prepared as photocatalysts, and their photocatalytic antiviral performance in the presence of humic acid (HA) was comprehensively studied for the first time. The properties of the reaction mixture were measured during the reaction. In addition, the safety, reliability and stability of photocatalytic disinfection in the mixed system were evaluated. The results showed that the virus removal efficiency decreased with the increase of the HA concentration. The type of reaction solution, such as PBS buffer solution or water, did not affect the removal efficiency noticeably. Under acidic conditions, the electrostatic forces between photocatalysts and viruses were strengthened, leading to higher virus removal efficiency. As the reaction time went on, the pH value in the solution increased first and then tended to be stable, the conductivity remained stable, and the dissolved oxygen increased first and then decreased. The safety test showed that the concentration of Cu ions released into the solution was lower than specified by the international standards. No photoreactivation was observed, and the addition of HA significantly reduced the reutilization efficiency of the photocatalysts.
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POLYMER
·
2018
·
IF 3.483
Hongde Lei,Lu Liu,Lukuan Huang,Weixing Li,Weihong Xing
In this study, we fabricated a novel anti-fouling poly(vinylidene fluoride) (PVDF) membrane using a novel amphiphilic copolymer of PVDF grafted with tetrahydrofurfuryl methacrylate (PVDF-g-THFMA). This copolymer was synthesized via photoinduced Cu(II)-mediated reversible deactivation radical polymerization . The amphiphilic copolymer was characterized by 1 H nuclear magnetic resonance and Fourier transform infrared spectroscopy . The morphology of the copolymer was examined using scanning electron microscopy. The permeability and hydrophilicity of the membranes were evaluated on the basis of their pure water flux and dynamic contact angles, respectively. The anti-fouling property of the membranes was evaluated by carrying out filtration using a bovine serum albumin (BSA) solution. The PVDF-g-THFMA copolymer membranes showed a pure flux of up to 293.9 L m −2 h −1 bar −1 and a molecular weight cut off of 39.5 kDa. After the filtration of the BSA solution, the PVDF-g-THFMA copolymer membrane was washed with deionized water and the recovery ratio of the pure water flux reached a value of 89.1%. The modified membrane showed good filtration performance and anti-fouling property.
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CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Yufang Wu,Zhenqiang Lv,Xin Zhou,Junjie Peng,Yuning Tang,Zhong Li
We report a bifunctional SBU-tuning strategy that simultaneously enhances the selective CO 2 adsorption capacity of Cu-BTC and its structural stability under moisture. A series of Gly@Cu-BTCs were prepared by grafting glycine (Gly) to the secondary building units (SBUs) of the commercially available Cu-BTC through the nano-seed assistant ultrafast room temperature synthesis. N 2 isotherms evidenced higher BET specific surface area and pore volume of Gly@Cu-BTCs than that of Cu-BTC. Hence, Gly 0.3 @Cu-BTC exhibited a superior CO 2 capacity of 5.4 mmol/g at ambient conditions, which is 12% higher than that of Cu-BTC. Besides, the adsorptive selectivity of Gly 0.3 @Cu-BTC for the equimolar CO 2 /CH 4 and CO 2 /N 2 mixtures was separately up to 8.53 and 59.38, being 11% and 15% higher compared to that of Cu-BTC. More importantly, the stability of Gly 0.3 @Cu-BTC against moisture was improved. After 10 days’ exposure in 55% relative humidity, Gly 0.3 @Cu-BTC preserved 80% of its original CO 2 capacity, while only 9% CO 2 capacity remained for Cu-BTC. In addition, negligible CO 2 capacity loss of Gly 0.3 @Cu-BTC was observed in the subsequent 10 days in moisture after the initial exposure. Gly 0.3 @Cu-BTC exhibited excellent regenerability, and its CO 2 desorption efficiency reached up to 98% based on the consecutive adsorption-desorption cycles. The origination of the improved stability under moist of Gly 0.3 @Cu-BTC was interpreted with DFT calculation. The bifunctional SBU-tuning strategy demonstrated in this work enables the potential adsorptive separation application of Cu-BTC under moist working condition.
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