BIOSENSORS & BIOELECTRONICS
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2022
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IF 12.545
Tao Liu,Bowen Lin,Xueli Yuan,Zhenyu Chu,Wanqin Jin
Mercury ion (Hg 2+ ) is a strong toxic heavy ion that causes severe damages to the environment and readily accumulates in the food chain. However, it remains a major challenge to realize a sensitive and precise recognition of Hg 2+ with a trace concentration for early identifying the pollution source. In this work, a novel electrochemical aptasensor was designed to achieve an ultrasensitive and quantitative detection of trace Hg 2+ , relying on an urchin-like architecture of [email protected] nanoneedles ( [email protected] ) as the electroactive probe. This specific nanostructure was in-situ constructed through a controllable pyrolysis process , serving as a signal magnifier and DNA loading platform owing to its outstanding electrocatalysis and large specific surface areas. Meanwhile, an exonuclease III-assisted cycling amplification strategy was designed to efficiently amplify the signal strength of trace Hg 2+ via the consecutive release of report probes in nicking reaction. This as-prepared Hg 2+ aptasensor exhibited an ultralow detection limit of 3.7 fM (7 × 10 −6 ppm) and a wide linear range from 10 fM to 10 μM, together with the satisfactory stability and reusability for assay in real water samples. It is highly expected that this [email protected] based aptasensor will have tremendous potentials in the early warning and efficient pollution monitoring of heavy metal ions .
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高影响因子
Materials Today Communications
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2022
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IF 3.662
Yaxi Tian,Dongyun Que,Rongfeng Guan,WenYan Shi
Cu-BiVO 4 photocatalysts with an excellent visible light response were successfully fabricated by modification with a SiO 2 template and Cu doping. The SiO 2 hard template changes the morphology of BiVO 4 from rod to sphere. The structure, chemical composition, and optical and photoelectrochemical properties of the photocatalysts were characterized. The photocatalytic activity was measured through RhB degradation under visible light irradiation. The results indicate that copper is successfully doped in the form of Cu 2+ and Cu + . Copper can be used as electron capture traps, which reduces the carrier recombination rate. Compared with other reports, Cu doping is found to greatly improve the ability of BiVO 4 to degrade RhB. The crystal phase of BiVO 4 is not significantly changed due to Cu doping, and the optimal doping amount is 10%. The RhB degradation rate of the optimal 10% Cu-BiVO 4 sample reaches 99.7% within 70 min. Cu-BiVO 4 exhibits stable degradation activity, and the photocatalytic kinetics follows a pseudo-first-order equation. ·O 2 - and h + play dominant roles in RhB degradation by Cu-BiVO 4 . The mechanism for the enhancement of the BiVO 4 photocatalytic ability was researched with first-principles calculations. The results of band structure and density of states calculations reveal that Cu doping not only promotes electron transitions but also acts as an electron trap to reduce the recombination rate and enhance the efficiency of separation and transfer of photogenerated charge carriers. This work highlights a new way to improve the photocatalytic performance and applications of BiVO 4 .
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 52
·78874-78886
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IF 5.19
Xu Junge,Hu Die,Wang Yingmu,Zhang Ziwei
Ciprofloxacin (CIP) is a third-generation fluoroquinolones (FQs) antibiotic, and the occurrence of CIP in the water environment has raised growing concerns owning to its environmental toxicity. In this paper, a novel α-(Fe, Cu)OOH/RGO nanocomposite was synthesized via a one-step reflux method for CIP degradation through a photo-Fenton-like process. When the RGO content was 1 wt%, CIP degradation ratio by the α-(Fe, Cu)OOH/RGO nanocomposite reached 100% under visible light irradiation within 120 min, and total organic carbon (TOC) removal ratio reached 60% within 180 min. The result of molecular fluorescence spectra highlighted that the loading of RGO on the α-(Fe, Cu)OOH significantly increased the content of hydroxyl radicals (·OH) in the heterogeneous photo-Fenton-like system and simultaneously inhibited the recombination of photogenerated electron and hole, which played critical roles in the enhancement of CIP degradation. In addition, 11 main intermediates were identified as the degradation products of CIP in the α-(Fe, Cu)OOH/RGO/H 2 O 2 /visible light reaction systems using liquid chromatograph–mass spectrometer (LC-MS) analyses. The results demonstrated that three degradation pathways for CIP removal by α-(Fe, Cu)OOH/RGO nanocomposite occurred, including (i) oxidation on the piperazine ring and dealkylation, (ii) defluorination and decarboxylation, and (iii) hydroxylation on the quinolone ring. This work would provide a novel insight of CIP degradation pathways in photo-Fenton-like processes. Graphical abstract
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高影响因子
AICHE JOURNAL
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2022
·Vol. 68
·期 11
·e17834
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IF 4.167
Wuyuan Liu,Zhaoying Wang,Ming Sun,Jiajian Gao,Lifeng Wang,Zihan Gao,Yingying Xu,Xiangyun Zhao,Cheng Zhang,Lin Yu
A series of CeO 2 modified Cu-SSZ-13 monolith catalysts were prepared by embedding CeO 2 into the washcoat of Cu-SSZ-13 monolith catalyst through solvent combustion method. These CexCu-SSZ-13 catalysts were studied in the selective catalytic reduction (SCR) of NO with NH 3 , among which the Ce2Cu-SSZ-13 catalyst exhibited the best low-temperature activity, hydrothermal stability, and sulfur resistance. The physicochemical properties of the catalysts were characterized using multiple methods. Results showed that the acidity, redox capacity, and ammonia adsorption capacity significantly enhanced after CeO 2 modification, thus leading to the high performance of Ce2Cu-SSZ-13 catalyst. Furthermore, the introduction of CeO 2 induced the fast SCR reaction by promoting the oxidation of NO to NO 2 . Analog calculation suggested that the porous structure generated via solvent combustion in the washcoat effectively increased the diffusion rate of reaction. In situ diffuse reflectance infrared Fourier transform spectroscopy ( in situ DRIFT) analysis showed that Brønsted acid sites were the main active center and the reaction followed Eley–Rideal mechanism.
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高影响因子
ELECTROANALYSIS
·
2022
·Vol. 35
·期 4
·e202200374
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IF 3.077
Yuanhao Pang,Zhourui Xiao,Yanan Deng,Xueying Zhou,Yu Wang,Yali Yuan,Yun Zhang
The electrodeposition method was firstly applied to obtain uniform cube-shaped copper nanoparticles on conductive glass (ITO), and then a layer of tiny nickel nanoparticles. A bimetallic composite electrode (Cu−Ni/ITO), characterized by TEM, XPS and XRD, was prepared to construct the non-enzyme electrochemical glucose sensor with high catalytic activity. The catalytic performance of Cu−Ni/ITO had been greatly improved, probably due to the synergistic bimetallic catalysis effect. The electrode had a satisfactory linear response in the range of 2.5×10 −7 M to 2.6×10 −3 M, with detection limit as low as 67 nM. Besides, Cu−Ni/ITO had good anti-interference ability and reproducibility, indicating the promising application for glucose detection in practical samples.
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高影响因子
Greenhouse Gases-Science and Technology
·
2021
·Vol. 11
·期 6
·1234-1244
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IF 2.013
Ting Lei,Dong Wei,Dongya Feng,Hao Chen,Hairong Yue
The Cu-based catalysts have been widely employed in the hydrogenation of CO 2 -derived ethylene carbonate (EC) to ethylene glycol (EG) and other derivatives, but still suffered from some problems such as unsatisfactory selectivity and catalyst stability. Herein, a Cu@MIL-101 catalyst was prepared via a two-solvent method to anchor copper (Cu) nanoparticles into the MIL-101 metal organic frameworks, which exhibited superior catalytic performance with ∼100% conversion, 2-hydroxyethyl formate (2-HEF) selectivity of 82% at 160°C, or EG selectivity of ∼92% at 180°C. The characterization results showed that the Cu 0 and Cr 3+ species play a key role on the dissociation of H 2 and activation of C-O and C=O bonds in the esters, and thus exhibited an excellent catalytic performance of the EC hydrogenation. In addition, the strong interaction between Cu 0 species and unsaturated coordination Cr 3+ species in the MIL-101 framework resulted in the high stability. Since the product of methanol was not generated on the Cu@MIL-101 catalyst, it is valuable to produce 2-HEF by controlling the temperature of 160°C in the EC hydrogenation rection. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.
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APPLIED CLAY SCIENCE
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2021
·
IF 5.467
Fushuai Wang,Fei Pan,Guoliang Li,Peiqing Zhang,Ning Wang
Developing cost-effective catalysts for the reduction of carcinogenic and highly toxic 4-nitrophenol to chemical and pharmaceutical intermediate 4-aminophenol has received considerable attention in recent years. Here, spherical montmorillonite (SMt) supported Cu-based catalyst doping with a covalent organic framework (COF) was constructed. Microsized SMt could be easily picked up from the mixture due to its self-sedimentary ability, which could easily solve the recycling issues of catalysts. Furthermore, granular SMt with uniform morphology and structure facilitated supporting and preparing catalysts with homogeneous properties. Moreover, SMt with a large specific surface area was suitable as the substrate for loading catalysts with high content. COF acted as a cocatalyst to accelerate the reaction processing. Cu + /Cu 2+ ions presented considerable catalytic ability for 4-nitrophenol removal due to their electron transferability and low cost. The valence of Cu ions on the prepared catalyst was analyzed and an apparent reduction rate constant ( K app ) of 5.3 min −1 and turnover frequency (TOF) of 955.5 h −1 were obtained at pH = 5 and 40 °C. The mechanism of the pH influence on the catalytic activity of our prepared heterostructure was further investigated. Moreover, the prepared heterostructure could be easily recovered and reused without any devices, and K app could be maintained after being recycled 5 times. Our strategy to fabricate cost-effective heterogeneous catalysts may provide a promising way to apply for these kinds of catalysts.
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高影响因子
ACS Applied Nano Materials
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2021
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IF 5.097
Yingping Zheng,Weidong Bao,Guoning Liu,Shaopeng Qi,Dehua Yu,Kaili Ma,Zhenrong Chen,Xiangting Hu,Yongbing Lou
Ultrasmall Cu/Ni-NiOx nanoparticles (NPs) had been successfully prepared by attaching and growing Ni-NiOx NPs on the surface of Cu NPs and then uniformly dispersed onto graphene (G) surface. High-angle annular dark-field–scanning transmission electron microscopy (HAADF-STEM) characterization confirmed that Ni-NiOx NPs were uniformly distributed on the surface of Cu NPs. The catalytic methanolysis of ammonia borane (AB) proved that Cu/Ni-NiOx NPs possessed high catalytic hydrogen (H2) evolution activity, and the highest turnover frequency (TOF) was 17.72 mol H2·mol–1 Cu·min–1. Comparative experiments revealed that the high catalytic activity originated from the abundant catalytic active sites of Cu/Ni-NiOx NPs. The attachment of Ni-NiOx on the surface of Cu NPs that dispersed on G (G-Cu/Ni-NiOx) can not only effectively improve the antioxidative performance of Cu NPs under ambient conditions but also promote the methanolysis of AB to produce H2.
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JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Yilin Wang,Senqing Fan,Zeyi Xiao,Zenghui Mai,Ke Bai,Jiaojiao Chen,Yu Chen,Jingyun Liu
A catalytic membrane nano reactor (CMNR) with deep-permeation nanocomposite structure (DPNS) has been fabricated by flowing synthesis for methanol dehydrogenation to formaldehyde. In this structure, Cu/ZnO nanoparticles are in situ immobilized in the pores of Ti membrane substrate with thickness 1 mm, pore size 10 μm and porosity 45%. The characterization by XRD , TGA , XPS, SEM and TEM indicates that the Cu/ZnO nanoparticles with mean size of 82 nm was successfully embedded into the membrane pores, and well distributed along the thickness direction of the membrane. The ICP measurement results demonstrate that the immobilization amount of 20 mg of Cu/ZnO nanoparticles per gram of Ti membrane substrate can be obtained. The prepared Cu/ZnO/Ti CMNR was built in the technological apparatus for catalytic dehydrogenation of methanol. For one sheet of membrane setting up, the conversion efficiency of methanol 7.5%, the mass specific activity 183 mmol MeOH ·h -1 ·g cat -1 , the pressure drop 2.7 kPa with gas permeating the membrane have been measured, under mass ratio of Cu to ZnO 0.05 in the membrane, reaction temperature 360 °C, the gas flux 8 m 3 ·m -2 ·h -1 through the membrane. The selectivity of formaldehyde is up to 98% and increases with increasing reaction temperature, the highest mass specific activity of 318 mmol MeOH ·h -1 ·g cat -1 can be achieved with mass ratio of Cu to ZnO 0.12 at 360 °C. For three sheets of CMNRs setting up in serials, over 18% of conversion efficiency has been achieved with gas pressure drop 6.8 kPa. If 70 sheets of CMNRs are packed in serials to build a reactor with 70 mm thickness, which will produce the gas pressure drop 162 kPa, the conversion efficiency of 99% would be expected according to a simple simulation based on the experimental measurement.
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APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Wei She,Jing Wang,Xuewei Li,Jingfang Li,Guijie Mao,Weizuo Li,Guangming Li
Tuning of the metal–metal/oxide interaction is a vital route to enhance the performance of the supported catalysts. In this study, a Cu/Zn bimetallic MOFs was synthesized through a simple solvothermal method by using an adenine rigid biomolecule acted as organic linker. Furthermore, a ZnO/nitrogen-doped carbon composite supported Cu catalyst (named as Cu-ZnO/NC-BMOFs) derived from the bimetallic CuZn-MOFs was obtained via one-pot pyrolysis method. The developed Cu-ZnO/NC-BMOFs catalyst was tested for hydrogenation-amination tandem reaction. The bimetallic CuZn-MOFs with the uniformly dispersed Cu and Zn centers acted as a self-sacrificing template, which could facilitate the derived catalyst with strengthened Cu-ZnO interaction, high dispersity, and more N species. All of these advantages give the developed Cu-ZnO/NC-BMOFs catalyst with higher performance in hydrogenation-amination tandem reaction compared with traditional Cu/ZnO/NC-IWI (synthesized by incipient wetness impregnation) catalyst. The Cu-ZnO/NC-BMOFs exhibits good stability for the recycling experiments with a negligible loss in its performance. More importantly, the Cu-ZnO/NC-BMOFs catalyst could convert nitroarenes into the corresponding imines or secondary amines with excellent selectivity (>90.0%). This bimetallic MOFs-derived strategy may provide a way for fabricating NC supported catalysts in other tandem reactions.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2021
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IF 5.876
Shihan Wang,Siyao Bian,Jianzhuo Liu,Jihui Li,Shuying Xu,Zhenyi Liang
Background Biochar has attracted considerable attention as a low-cost adsorbent comprised of carbon matrix and mineral for treatment of wastewater. The main purpose of this work was to manufacture CaCO 3 -rich biochars using crayfish shell as feedstock for removal of Cu(II) and Pb(II) from aqueous solution. Methods Pristine and magnetic biochars were prepared via direct pyrolysis and K 2 FeO 4 -promoted pyrolysis , respectively, and characterized by element analysis, BET, FTIR, SEM-EDS, XRD and XPS. Moreover, their adsorption capabilities toward Cu(II) and Pb(II) were investigated in aqueous solution. Findings A large amount of CaCO 3 was assembled on the pristine biochar pyrolyzed at 600 °C, leading to 715.10 mg/g and 1682.87 mg/g adsorption capacities for Cu(II) and Pb(II), respectively. Whereas, CaCO 3 and single phase Fe 3 O 4 were simultaneously introduced into the magnetic biochar with K 2 FeO 4 -promoted pyrolysis at 600 °C using 1/1 (g/g) ratio of K 2 FeO 4 to crayfish shell, where 417.05 mg/g and 974.10 mg/g maximum adsorption capabilities were obtained for Cu(II) and Pb(II) with 29.66 emu/g saturation magnetism, respectively. Cu(II) and Pb(II) were mainly adsorbed onto the biochars as carbonates and oxides by their interaction with CaCO 3 and carbon matrix.
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高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Qing Wang,Yun Mou,Jiaxin Liu,Yang Peng,Mingxiang Chen
The electrochemical behavior of additives determinates the filling process of through ceramic holes (TCHs), which is severely affected by Cu(II) concentration in the virgin make-up solution (VMS). High concentrations of Cu(II) are rarely reported in through-holes (THs) filling owing to its insufficient throwing power. High concentration CuSO 4 (0.7 M) and low concentration H 2 SO 4 (0.61 M) were confirmed as VMS, and thiazolinyl polydipropyl sulfonate (SH110), polyethylene glycol (PEG), and nitrotetrazolium blue chloride (NBT) were chosen as the accelerator, suppressor, and leveler, respectively. The electroplating performances were investigated under different plating solutions. The electrochemical behavior of additives and their combinations were evaluated by galvanostatic and cyclic voltammetric measurements. The filling performance of PEG-SH110-NBT in high Cu(II) solution is affected by convection. Plating efficiency is effectively improved by SH110 in the designed high Cu(II) plating solution. PEG and NBT have a synergistic effect on inhibition, while NBT shows a leveling effect only in the presence of SH110. The plating solution with a low air agitation flow rate effectively promotes the high-quality filling of TCHs with a high aspect ratio (AR) of 5, 4.75, and 3.8. The filled TCHs display mirror-bright surface and grain refinement without the void defects.
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高影响因子
危险品化学品经营许可证（带存储）