Materials Today Communications
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2021
·
IF 3.383
Yanqing Xue,Bo Li,Xinliang Wang,Xinlei Li,Han Zhang,Qitang Hao
Agglomeration behavior of TiB 2 particles in 5%TiB 2 /Al-4.5%Cu composites (all compositions are in wt.% unless otherwise specified) is studied by adding different content of Mg to improve its strength and ductility, a widely used in-situ molten salt reaction process is used to produce the composites. The results show that addition of Mg could not only significantly segregate TiB 2 particles but also further refine the α-Al grains and then improve the mechanical properties of the composites on the basis of TiB 2 particles. Here, 0.5% Mg is considered the optimum mass fraction for dispersion, refinement, and modification of particles based on the results of investigation. The yield strength (YS), ultimate tensile strength (UTS), elastic Young’s modulus (EM), and Vicker’s hardness (VHN) of the composites in T6 heat treatment are increased to 375 MPa, 486 MPa, 88 GPa, and 167 HV - an improvement of 21.8%, 16.5%, 20.9%, and 9.4%, respectively, versus the original TiB 2 /Al-4.5%Cu composite (308 MPa, 417 MPa, 63 GPa, and 153 HV). The elongation of the composite is improved by 20.9%. These merits are mainly attributed to addition of Mg, which increases the surface-spread coefficient of TiB 2 particles by reducing the surface tension of the Al melt, thereby improving the wettability .
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Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Yuting Hu,Shixing Wang,Libo Zhang
A novel Cu-based bisligand metal organic framework adsorbent (Cu-BMOF) was prepared by hydrothermal method using 5-methyl-2-thiophenecarboxylic acid and 4,4-azopyridine as organic linkers. The samples were analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and zeta potentiometry (Zeta). To investigate the adsorption performance of Cu-BMOF for Au(III), the effects of pH, temperature, adsorption time and initial concentration were explored. At 298 K and pH = 2, the maximum adsorption capacity of Cu-BMOF for Au(III) is 933 mg/g. Langmuir and quasi-second-order models can describe the adsorption process well. Au(III) adsorption on Cu-BMOF is a monolayer and irreversible chemisorption process. Thermodynamic studies show that the adsorption process of gold on Cu-BMOF is exothermic and spontaneous. The response surface method (RSM) was applied to optimize the adsorption efficiency. Under optimal conditions, the adsorption rate was 99.64%. X-ray photoelectron spectroscopy (XPS) results show that the adsorption mechanism of Cu-BMOF is the binding between Au (III) and the N, and S functional groups of Cu-BMOF. In addition, the affinity of Cu-BMOF for Au(III) is superior compared with that of coexisting ions in water. Cu-BMOF have promising applications in environmental protection and water purification .
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Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Zhifei Hao,Guoquan Liu,Nan Ma,He Zhang,Yi Li,Yuguo Xia,Dongpeng Zhang,Sihui Zhan
Acidity and redox properties of the catalyst are two crucial factors affecting the performance of NH 3 -SCR. Herein, we design a novel WO x /Cu-CeO 2 oxide catalyst in which the WO x species are highly dispersed on the {111}/{100}-terminated surface of Cu-doped CeO 2 nanospheres , which exhibits great deNO x activity advantage and wide operating temperature window (200–400 °C, over 85% NO x conversion with a gas hourly space velocity (GHSV) of 60,000 h −1 ), as well as good sulfur resistance and N 2 selectivity . The relationship among the composition, acidity and redox properties of the WO x /Cu-CeO 2 catalyst is established in the NH 3 -SCR reaction. The combined experimental studies and spectroscopic characterization reveal that the introduction of Cu into the lattice of CeO 2 not only increases the surface Ce 3+ and oxygen vacancy concentration but also provides more sites for capture and dispersion of WO x species, thus mediating and improving the Lewis and Brønsted acid sites and reducibility of catalyst. XPS and DFT calculations further demonstrate that electronic interaction between WO x and Cu-doped CeO 2 is enhanced duo to the existence of interactions of short-range Ce-O-Cu and Ce-O-W. Moreover, the NH 3 -SCR reaction over WO x /Cu-CeO 2 may follow both Langmuir-Hinshelwood and Eley-Rideal reaction pathway according to the in situ DRIFTS.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2021
·Vol. 29
·期 20
·29613-29623
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IF 4.223
Zhao Dianjia,Ye Wenkang,Cui Wenxuan
As eco-friendly adsorption material, hydroxyapatite (Ca 5 (PO 4 ) 3 OH, HA) has been extensively applied to the removal of heavy metal ions. However, separating and recovering of HA powder after the adsorption process limits their application. Alginate-based composite beads (HCA) encapsulated with HA and cellulose were designed to remove Cu(II) from aqueous solution. Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) were used for characteristic analysis. An extensive discussion in terms of HCA adsorption capacity, effect of various Cu(II) concentration, and analysis of the involved mechanisms of Cu(II) removal on the biosorption. HCA beads showed that the maximum adsorption capacity for Cu(II) of 64.14 mg/g at pH = 5 with 8 h contact time. The Langmuir adsorption isotherm and second-order kinetic model gave the closest fit. HCA beads display good regeneration ability after four cycles and offer potentiality for practical application.
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PubMed
高影响因子
ACS Applied Nano Materials
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2021
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IF 5.097
Sellan Premkumar,Zhouzheng Jin,Dan Liu,Devaraj Nataraj,Bhekie B. Mamba,Alex T. Kuvarega,Jianzhou Gui
Improving charge transport properties between the quantum dots (QDs) and reducing the non-radiative recombination have been attempted on silver bismuth iodide (Ag2BiI5) perovskite QDs using oleylamine–sulfide passivation. Herein, we have prepared Ag2BiI5 silver bismuth iodide QDs via a simple ligand-assisted reprecipitation method, and the samples were passivated with the oleylamine–sulfide complex. The absorption and emission profiles were red-shifted, which implies that the overall size of the QDs has increased after the passivation. An increase in the emission intensity confirmed the reduction of non-radiative recombination and an increase in excited-state carrier lifetime, as observed from the time-correlated single-photon counting-lifetime measurements. Further, the photocurrent devices were fabricated and generated high-magnitude photocurrent values in the ranges of ∼1.1 to 1.8 μA (bare Ag2BiI5) and ∼0.27 to 0.54 μA (oleylamine–sulfide-passivated Ag2BiI5) for the biasing voltages of 0.1 and 0.2 V, respectively. Surprisingly, the oleylamine–sulfide-passivated Ag2BiI5 sample exhibited a sharp rise in the photocurrent value with a high on/off ratio. In addition, the bare and oleylamine–sulfide-passivated QDs were further applied for the fluorescence detection of copper Cu(II) ions in drinking water samples for the first time.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
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IF 3.218
Waseem Abbas,Qinglei Liu,Naeem Akhtar,Javed Ahmad,Muhammad Ehsan Mazhar,Tengfei Li,Imran Zada,Lulu Yao,Raheela Naz,Muhammad Imtiaz,Wang Zhang,Ali Amjad,Di Zhang,Jiajun Gu
Precisely monitoring dopamine (DA) with high sensitivity, selectivity, and low cost from real life biological samples such as urine to investigate the suspected catecholamine-secreting tumor remains a big challenge. Here, for the first time, we synthesize a DA sensor based on Cu nanoplatelets (Cu@CNP) encapsulated by carbon nanoparticles (CNP) that are pre-modified by a benzimidazolium-1-acatate ionic liquid (BAIL). The simple scalable route (freeze-drying followed by a temperature-switchable carbonization process) enables the CNP shells with controlled thickness to form upon the Cu nanoplatelets. Among the resulting products, Cu@CNP-600 (Cu@CNP carbonized at 600 °C) shows a high concentration of exposed {111} Cu crystal planes, surface defects with quadrupole and dipolar plasmons multipoles , and graphitic layers. Once deposited onto the lead pencil electrode (LPE), the Cu@CNP-600 modified with highly conductive BAIL synergistically allows highly sensitive and selective detection of DA. We successfully apply this novel electrode to monitor the DA from the urine of neuroblastoma patients with high sensitivity. The designed electrode can be used not only in the diagnosis of suspected catecholamine-secreting tumors but also in the evaluation of drugs’ efficacy.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Deshan Cheng,Xue Bai,Junjie Pan,Jihong Wu,Jianhua Ran,Guangming Cai,Xin Wang
Incorporating conductive components into fibrous structure for wearable applications has attracted research attention recently. However, utilizing the flexibility and wearability of textiles to maintain a stable and durable wearable performance is a big challenge, as the intrinsic properties of textiles and the conductivity of the incorporated components have to work synergically in the fibrous system without compromising. In this work, polydopamine-templated PET fabrics were prepared to grow copper nanoparticles (Cu NPs) on the surface of the knitted PET fabrics. The surface morphology, chemical composition and crystalline structure of the Cu NP-coated PET fabrics were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The results showed that Cu NP layer was successfully deposited onto the polydopamine-templated PET fabrics. The fabrics showed excellent electrical conductivity due to the loading of Cu NPs. The unique knitted structure together with the durable deposition of Cu NPs resulted in negative change in electrical resistance of the fabrics under strains, granting the fabrics the potential in wearable applications. The Cu NP-coated PET fabrics were demonstrated to be applicable as wearable strain sensors and electrical heaters.
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RSC Advances
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2019
·Vol. 9
·期 70
·40845-40854
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IF 3.049
Saira Shams,Waqas Ahmad,Amjad Hussain Memon,Yun Wei,Qipeng Yuan,Hao Liang
Herein, we report an effectual method for designing a novel form of nanozyme laccase mimic namely Cu/H3BTC, using copper ions and 1,3,5-benzene tricarboxylic acid (1,3,5-H3BTC). This Cu-based metal–organic framework (MOF) was synthesized through a simple procedure of mixing of two usual reagents at room temperature. Amido Black 10B (AB-10B) was chosen as a model dye for degradation consequences. Results showed that Cu/H3BTC MOF revealed significantly higher catalytic efficacy under certain conditions like high pH, extreme temperature and high salt conditions and it has long-term storage stability, which can lead to a significant decline in catalytic activity of laccase. In addition, the degradation of AB-10B was up to 60% after ten cycles, showing good recyclability of Cu/H3BTC MOF. The UV-visible spectral changes clearly showed that Cu/H3BTC MOF is an effective laccase mimic for the degradation of azo dye AB-10B, which was degraded more easily within the time duration of 60 min. The Cu/H3BTC MOF also possessed fundamental activities like laccase with regard to oxidation of the phenolic compounds. Moreover, a technique for the quantitative detection of epinephrine by Cu/H3BTC MOF was established. These findings help to understand the laccase-like reactivity and provide a basis for the future design and application of metal-based catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Faqing Shi,Limeng Liu,Yujin Wang,Guihong Geng
TaC 0.6 -Cu composites were fabricated by hot pressing of TaC, Ta and Cu powder mixtures. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, scanning-transmission microscopy, X-ray energy-dispersive spectroscopy, and selected area electron diffraction were used to investigate formation process and growth behavior of the ζ-Ta 4 C 3-x lamellae. Cu addition did not change the reaction sequence of TaC + Ta → Ta 2 C + TaC y → ζ-Ta 4 C 3-x to form the targeted ζ-Ta 4 C 3-x phase, but enhanced growth of ζ-Ta 4 C 3-x lamellae by introducing a dissolution-reprecipitation mechanism due to presence of Cu liquid at high temperatures. ζ-Ta 4 C 3-x could directly nucleate and grow on h-Ta 2 C grain surface, meanwhile C immediately reacted with Ta solutes in Cu liquid after the C atoms diffusing along the {111} TaCy stacking faults out of parental γ-TaC y grains to initiate extension of ζ-Ta 4 C 3-x lamella outside the γ-TaC y grains, thus grew large ζ-Ta 4 C 3-x lamellae with a uniform thickness in the microstructure of the TaC 0.6 -Cu composites. The TaC 0.6 -Cu composites with large ζ-Ta 4 C 3-x lamellae in the microstructures showed increase in fracture toughness.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Tao Luo,Yanan Yuan,Danna Zhou,Liting Luo,Jinjun Li,Feng Wu
In the recent years, sulfite-induced oxidation of various contaminants using oxysulfur radicals (SO 4 − , SO 5 − and SO 3 − ) has been explored to establish novel advanced oxidation processes (AOPs). Although transition metals, such as cupric ions (Cu(II)), have been demonstrated to be capable of activating sulfite (S(IV)), the catalytic mechanism of the specific Cu(II) species is still not very clear. In this work, N-acetyl- para -aminophenol (APAP) was used as a basic substrate to investigate the process, mechanism and stability of the Cu(II)-S(IV) system with low dosages of Cu(II) (0.010 mmol L −1 ) in an alkaline solution (pH 10). The results show that 0.010 mmol L −1 Cu(II) can efficiently activate S(IV) for the oxidation of APAP and other contaminants (e.g., metoprolol, sulfanilamide, aniline, 4-chloroaniline, N,N-dimethylaniline, p -nitrophenol and 3-nitrophenol). Simulation calculations for the distribution of the Cu(II) species and pH-dependence of APAP oxidation in the Cu(II)-S(IV) system showed that Cu(OH) 2 particles are the major active species in the catalysis of S(IV). The surface complexation of S(IV) with the Cu(OH) 2 particles prior to the production of oxysulfur radicals is the basic mechanism of the alkaline Cu(II)-S(IV) system. Radical inhibition with scavengers (ethanol, tert-butyl alcohol or aniline) demonstrates that SO 5 − , SO 4 − and hydroxyl radicals (HO ) are responsible for the contaminant oxidation. Moreover, SO 5 − is believed to be the main active species in the Cu(II)-S(IV) system, which has a second-order rate constant of 2.98 × 10 8 M −1 s −1 with APAP. This work renews our recognition of the Cu(II)-S(IV) system applications and further understanding of the catalytic role of the nascent Cu(OH) 2 particles in the activation of S(IV).
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Lei Wang,Wenjing Zhi,Jing Wan,Juan Han,Chunmei Li,Yun Wang
Enhancing the stability and reusability of enzymes by encapsulating them within a powerful class of porous materials termed metal–organic frameworks (MOFs) has been demonstrated by recent studies. However, in all of these reports, the stability of MOFs under acidic conditions was a major issue for enzymes with catalytic activity at low pH. The objective of this study is to encapsulate the β-glucosidase (β-G) into the Cu-MOF due to its acidic stability, using a coprecipitation approach. Indeed, the as-prepared β-G@Cu(PABA) biocomposite with high encapsulation efficiency exhibited enhanced resistance to acidic and thermal conditions as well as organic solvents. Importantly, the β-G@Cu(PABA) biocomposite showed superior reusability, retaining 90% of activity even after 10 cycles. Using the hydrolysis of carboxymethylcellulose (CMC) as a mode, the mixture of β-G@Cu(PABA) biocomposite and coimmobilized cellulase afforded 98% glucose yield, which was twofold enhancement when compared with coimmobilized cellulose alone. The β-G@Cu(PABA) biocomposite and coimmobilized cellulase could been easily recovered and recycled to still retain 70% productivity in the eight cycles for hydrolyzing CMC. This discovery for the first time highlights the potential of Cu-MOF in preserving the enzymes under acidic conditions. The developed β-G@Cu(PABA) biocomposite by coprecipitation approach affords a valuable platform for enzyme-based industrial applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Dejin Zang,Yichao Huang,Qi Li,Yajie Tang,Yongge Wei
The design and synthesis of specific functional complex materials as desired catalysts for improved energy conversion and storage are of great importance and with grand challenges. Here, a facile synthesis strategy of Anderson POMs supported Cu dendrites toward electrochemical hydrogen evolution reaction with dramatically decreased overpotential under acidic aqueous condition is established in this work. We present the preparation of well crystallized Cu dendrites through co-electrodeposition on TiO 2 array with Anderson-type POM NiMo 6 O 24 . Structural and state of valence investigation of the as-obtained electrocatalyst (NiMo 6 O 24 @Cu/TNA) evidence the specific morphology tunability and modification of Cu dendrites surfaces. During HER course, NiMo 6 O 24 can improve the H + transfer and further help the H atom absorption which remedies the weakness of insufficient H atom absorption ability of Cu along with its strong electron transfer lowering overpotential upon HER. Therefore, HER with NiMo 6 O 24 @Cu/TNA is considerably enhanced by decreasing related overpotential of 130 mV compared to porous Cu foam. The modification of NiMo 6 O 24 endowed catalysts strong corrosion resistance assuring long term stability. Hence, the proposed strategy possesses improved activity and long term stability upon HER with NiMo 6 O 24 @Cu/TNA as electrocatalyst. Depending on the diversity of POMs, the current feasible and reliable heterogeneous electrocatalysts design with POMs would inspire more effective, low-cost strategies for energy conversion and open the pathway for large scale production.
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