INORGANIC CHEMISTRY
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2021
·
IF 5.165
Yi-Xin Zhang,Yun-Qiao Tang,Zheng Ma,Ming-Yu Hu,Jing Feng,Zhen-Hua Ge
In this study, Cu2Se1–xSx (x = 0.1, 0.3, and 0.5) alloy powders were prepared by the hydrothermal synthesis method. In the subsequent sintering process, the spontaneous in situ phase separation process of the sample forms a two-phase hybrid structure. The generated Cu2S precipitates in the Cu2Se matrix noticeably enhance phonon scattering, which is beneficial for low thermal conductivity without significantly affecting the electrical transport performance. Ultimately, an optimized thermoelectric performance was obtained in Cu2Se0.9S0.1, reaching a peak zT value of 1.43 at 773 K, the optimum value among the Cu–Se–S systems at this temperature.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Huihui Wu,Jingjing Yan,Xin Xu,Qianhui Yuan,Jinhang Wang,Jun Cui,Aijun Lin
Advanced oxidation processes (AOPs) are promising ways for oxidative degradation of organic pollutants. Atom-dispersed transition metal–nitrogen–carbon (M–N–C) materials exhibit excellent efficiency in activating peroxide bonds and have been extensively pursued for environmental remediation. However, M–N–C with single atoms suffer from intrinsic performance limit of complicated catalytic reactions due to structural simplicity and lack of synergistic active sites. Herein, derived from Fe/Cu–coordinated zeolitic imidazolate frameworks with molecular-scale cages, a well–designed catalyst featuring Fe–Cu dual–metal sites coordinated with N–doped carbon (Fe/Cu–N–C) was fabricated. Compared to the single-atom iron catalyst (Fe–N–C), Fe/Cu–N–C significantly enhanced the chloramphenicol removal rate from 0.073 to 0.093 min −1 due to the synergistic effects of Fe–Cu dual active site. Furthermore, Fe/Cu–N–C exhibits fantastic reactivity for peroxydisulfate (PDS) activation in a wide pH range (3.1 – 10.3). Density functional theory calculations revealed that Fe/Cu–N is the major active site, where electrons transfer from Cu to Fe ensure the low-valence state of Fe for catalytic oxidation. Besides, the optimization of adjacent Cu–N sites improves the bonding orbital distribution of Fe 3d orbitals and promotes the adsorption and cracking of PDS. These findings reveal the cooperative mechanism of Fe–Cu dual–atom site on PDS activation and develop a promising platform toward environmental purification.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Xue Hu,Xiaodan Zhang,Haiyan Cao,Yuming Huang
Copper nanoclusters (Cu NCs) have emerged as promising platform for biosensing, but it remains a challenge to fabricate highly stable Cu NCs with controllable photoluminescence . Herein, we propose a new and elaborate strategy to prepare photoluminescent Cu NCs by using Cu-based metal-organic frameworks (Cu-MOFs) as the precursor. The generated Cu NCs display ordered nanowire structure and superior stability due to the crystal structure of Cu-MOFs. Moreover, the Cu NCs possess unique pH-dependent photoluminescence property. With pH increasing, the yellow-green emission of Cu NCs at 520 nm decreases, and new cyan emission at 455 nm appears and increases gradually. This process might be related to the structure change of the Cu NCs from aggregated nanowire into dispersed spherical particle. On the basis, a facile ratiometric fluorescent sensing platform for pH is fabricated. This ratiometric sensor has great anti-interference capacity and excellent reversibility . In addition, it was successfully applied to monitor the pH of microorganisms, demonstrating the great potential in bioassays. This new synthetic strategy for preparing Cu NCs with tunable emission property may propose new opportunities for their applications.
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RARE METALS
·
2021
·Vol. 41
·期 3
·931-941
·
IF 4.003
Guo Jun,Wang Zi-Yuan,Zhu Yu-Ke,Chen Lin,Feng Jing,Ge Zhen-Hua
Bi 2 S 3 is composed of inexpensive and environmental friendliness elements, which has received extensive interests and been investigated as a promising mid-temperature thermoelectric material for years. Even pure Bi 2 S 3 possesses a high Seebeck coefficient and low thermal conductivity, its low electrical conductivity leads to a low figure of merit (ZT) value. In this work, Bi 2 S 3 fabricated by solid-state melting combined with spark plasma sintering can significantly enhance the thermoelectric performance via introducing small amounts of Cu and BiCl 3 . Cu interstitial doping and Cl substitution on S site result in a large increase in electrical conductivity. Additionally, the enhanced phonon scattering is derived from the point defects caused by element doping, the grain boundaries, and the small amount of secondary phase, which leads to the low thermal conductivity. Finally, a high ZT value of 0.7 is obtained at 773 K and reaches a large average ZT of 0.36 in the temperature range from room temperature (RT) to 773 K for the Cu-interstitial-doped and BiCl 3 -alloyed (Cu 0.01 Bi 2 S 3 + 0.175 mol% BiCl 3 ) sample. Furthermore, the mechanical properties of the Cu 0.01 Bi 2 S 3 + 0.175 mol% BiCl 3 sample are lower than those of other Bi 2 S 3 samples, which stem from the weak chemical bonding strength. Graphic abstract
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DESALINATION
·
2021
·
IF 9.501
Xu Ma,Xinyi Wan,Zhou Fang,Zhuoyi Li,Xiaobin Wang,Yue Hu,Mengyang Dong,Zhizhen Ye,Xinsheng Peng
Solar-driven interfacial desalination (SDID) has emerged as an efficient and eco-friendly technology to produce clean water. However, salt deposition on photothermal material severely restricts the operation stability and service life. Herein, this issue was addressed by regulating the oriented seawater transportation through flexible Cu(TCNQ) metal-organic frameworks (MOFs)-based nanorod arrays (MAS) and isolating the salt crystallization from the evaporating surface. The SDID device with the novel architecture is rationally designed, which not only shows good anti-salt deposition ability and superior clean water production performance, but also achieves simultaneous salt extraction. Under 1 sun irradiation, the MAS in SDID device displays an impressive water evaporation rate of 1.78 kg m −2 h −1 (projected area) and a high salt extraction rate of 47.0 g m −2 h −1 . Even at night, the MAS can also extract salt at the rate of 12.6 g m −2 h −1 . This work provides a new idea to design highly efficient multifunctional solar desalination device for seawater resource comprehensive utilization and zero-liquid discharge.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Yongjun Sun,Yuanyuan Yu,Xing Zheng,Aowen Chen,Huaili Zheng
In this study, three magnetic flocculants, namely, MC, MC-g-PAM, and MC-g-PAA, were prepared. The structure characteristics, flocculation performance, and floc characteristics of the three magnetic flocculants were systematically studied and compared. SEM, FT-IR, XPS, XRD, TG–DSC, and VSM characterization results show that MC, MC-g-PAM, and MC-g-PAA are successfully prepared and exhibit good magnetic induction. The removal rates of copper ions by MC, MC-g-PAM, and MC-g-PAA under the optimal coagulation conditions are 93.39 %, 88.64 %, and 61.41 %, respectively. Kinetic fitting shows that the flocculation reaction process of MC and MC-g-PAM conforms to pseudo first-order kinetics, while the flocculation reaction process of MC-g-PAA conforms to pseudo second-order kinetics. The flocs produced by MC-g-PAA have larger particle size and fractal dimension than those by MC and MC-g-PAM. At 80 mg/L dosage and pH 6, the floc size and floc fractal dimension obtained by MC-g-PAA reach the maximum values of 48.28 um and 1.468, respectively. Zeta potential studies show that the flocculation functions of the three flocculants are mainly adsorption bridging, adsorption electric neutralization, and chelating precipitation. Recycling experiments show that MC-g-PAA has good recyclability, and the recovery rate after the fifth use is 77.24 % with the Cu(II) removal rate of 67.53 %.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Xia Xu,Ke Jia,Shifei Chen,Daning Lang,Chao Yang,Lu Wang,Ronglan Wu,Wei Wang,Jide Wang
The complex and time-consuming character of the current methods to synthesize cuprous catalysts hampers use of such compounds as replacements for noble metal catalysts for the degradation of organic pollutants . Herein, we report on the development of a simple one-pot method for synthesis of Cu 2 O/Cu nanoparticles . The method was comprised of adding benzyl alcohol during the process of nanoparticle synthesis, where the amount of benzyl alcohol used determined the content of Cu in the obtained nanoparticles . A thorough physicochemical characterization was carried out for the synthesized nanoparticles, where it was found that they could act as catalysts for ultra-fast degradation of phenolics and dyes. Thus, their catalytic activity for the degradation of 4-nitrophenol, methyl orange, and Congo red were evaluated, where pseudo-first-order kinetics were observed. The percentage degradation and rate constant (k app ) values were, respectively, 98% (in 60 s) and k app = 61.23 × 10 −3 s −1 for 4-nitrophenol, 96% (in 100 s) and k app = 31.5 × 10 −3 s −1 for methyl orange, and 97% (in 100 s) and k app = 35.5 × 10 −3 s −1 for Congo red. Comparisons with previously reported cuprous catalysts for degradation of these compounds revealed that the Cu 2 O/Cu nanoparticles of the present paper exhibited the fastest degradation rates.
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IRANIAN POLYMER JOURNAL
·
2021
·Vol. 30
·期 7
·685-695
·
IF 1.899
Zeng Lelin,Zhou Feixiang,Zhan Xuehui,Zhang Yusheng,Xie Wanyun,Wang Guoxiang,Liang Enxiang
Heavy metal pollution is a serious environmental problem, and adsorption is regarded as an effective technology for metal ions removal. A new absorbent triethylene tetramine (TETA)-modified crosslinked polyacrylonitrile (TETA-modified XL-PAN) was prepared by photo-induced precipitation polymerization of acrylonitrile in water at room temperature using FeC 2 O 4 as photoinitiator and N , N′ -methylenebisacrylamide as crosslinking agent. The TETA provided amidogens, to bond Cu(II) ions and the crosslinking agent was used to improve the stability of adsorbent. FTIR, SEM, BET, and TG were used to characterize the TETA-modified XL-PAN. The FTIR results demonstrate that the XL-PAN was successfully modified by TETA. The SEM images show that TETA-modified XL-PAN powders were agglomerated from 100 to 200 nm spherical particles. TETA-modified XL-PAN was used as an adsorbent to remove Cu(II) ion from wastewater. The effects of contact time, pH, Cu(II) concentration, temperature, and reuse cycles on adsorption were investigated, respectively. Experimental results showed that the adsorption isotherms agreed well with the Langmuir model and a chemical adsorption between TETA-modified XL-PAN and Cu(II) was inferred. After optimizing the experimental conditions, the maximum adsorption capacity of TETA-modified XL-PAN for Cu(II) was 46.6 mg/g with an adsorption time of 8 h. Furthermore, the TETA-modified XL-PAN adsorbent can be well regenerated by acid solutions. After eight regeneration and adsorption processes, the adsorption capacity still reached more than 90% of the first adsorption capacity. These results demonstrated the potential use of TETA-modified XL-PAN as an effective adsorbent for Cu(II) ions removal from wastewater.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 41
·14475-14482
·
IF 4.174
Jing Yang,Xianliang Li,Junbiao Wu,Yide Han,Zhuopeng Wang,Xia Zhang,Yan Xu
Multicomponent spinel ferrites are essential to be used in high-performance gas-sensing materials. Herein, multinary (Cu,Zn)Fe2O4 spinel nano-microspheres with tunable internal structures, including solid, core–shell, and yolk–shell, were successfully synthesized by a simple self-templated solvothermal method combined with a subsequent annealing strategy. The internal structures of the (Cu,Zn)Fe2O4 nano-microspheres significantly rely on the heating rates of the precursors, which show promising selective response towards trimethylamine gas. Among them, the as-formed yolk–shell (Cu,Zn)Fe2O4 nano-microspheres exhibited high response to triethylamine with excellent selectivity of STEA/SX = 1.86 at 160 °C, fast response–recovery rate (58 s/136 s), and long-term repeatability and stability of more than one month. The corresponding triethylamine gas-sensing mechanism with the special microstructures is discussed. This work provides new insights into the rational design of interior structure and the modulation of high gas response and selectivity of multinary spinel ferrites in gas-sensing applications.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 41
·17671-17678
·
IF 3.288
Saira Shams,Waqas Ahmad,Amjad Hussain Memon,Sumaira Shams,Yun Wei,Qipeng Yuan,Hao Liang
The objective of this study was to design a more effective antibacterial agent to overcome the problem of fast-growing bacterial resistance. The results showed that a Cu/H3BTC metal–organic framework (MOF) exhibited a notable antibacterial performance towards Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli), and could significantly disrupt the cell membrane, resulting in the discharge of cell constituents. In addition, morphological changes were elucidated using scanning electron microscopy (SEM). SEM photographs demonstrated noticeable and apparent changes in the morphology of bacterial cells, signifying cell damage that was further confirmed via confocal laser scanning microscopy (CLSM). Furthermore, the result of agarose gel electrophoresis (AGE) showed that Cu/H3BTC MOF could enter the bacterial cells by impairing cell membranes and inhibiting the synthesis of DNA. These findings indicated that the Cu/H3BTC MOF is a potent antimicrobial material that can be applied to hinder the growth of pathogenic microbes.
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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2020
·Vol. 52
·期 1
·314-321
·
IF 2.035
Ren Guoxing,Xiao Songwen,Xia Longgong,Liao Caibin,Liu Zhihong
To obtain fundamental information on the dissolution of cobalt into alumina-saturated MnO-SiO 2 -Al 2 O 3 slags in the smelting reduction of spent lithium-ion batteries, the equilibrium distribution of cobalt between Co-Cu alloys and alumina-saturated MnO-SiO 2 -Al 2 O 3 slags was measured at 1573 K and 1623 K under a controlled CO-CO 2 atmosphere. The results show that (i) the solubility of cobalt in the slag increased with increasing concentration of cobalt in the alloy and increasing oxygen partial pressure in the atmosphere at a fixed concentration of cobalt in the alloy, and (ii) the activity coefficient of CoO in the slag increased with increasing cobalt oxide in the slag. The activity coefficient of CoO in the slag, γ CoO, referred to as solid CoO, can be described as a function of the concentration of CoO in slag as follows: γ CoO = 11.2957(wt pct CoO in slag) + 12.0944 (1573 K, (wt pct MnO)/(wt pct SiO 2 )= 0.76–0.83); γ CoO = 2.2286(wt pct CoO in slag) + 4.5232 (1623 K, (wt pct MnO)/(wt pct SiO 2 )= 0.78–0.85).
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Handong Jiao,Jianxun Song
Owing to the enhanced selective depolarization effect of the liquid Cu, Ti has been successfully collected from mixed oxide ores or slags by using advanced molten oxide electrolysis (MOE) configuring with a liquid Cu cathode. However, the products prepared via above process are Cu-Ti alloys. Additional process is needed for the separation of Ti from those alloys. To achieve this goal, here, we selected a simple electrochemical approach to separate Ti from the Cu-Ti alloys in molten salt. Compared to the pure Cu electrode, the Cu-Ti alloys with different Ti contents show more negative electro-oxidation potential, which, in principle, indicates that Ti could be electrochemically extracted from the Cu-Ti alloys. Furthermore, the results of constant current electrolysis show that the effective separation of Ti is affected by the anodic current density and the Ti content in the Cu-Ti alloys. Specifically, the anodic current density, enabling the effective separation of Ti, increases with the increase of the Ti content in the Cu-Ti alloys. We have fitted a relationship equation between the anodic current density and the Ti content, which will be helpful for guiding separation of Ti from the Cu-Ti alloys. These findings confirm the feasibility of the molten salt electrolysis for the separation of Ti, and also make the Ti extraction based on the advanced MOE a complete process.
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