Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Wenjun Zhu,Sylvestre Ndayiragije,Xiaohua Zuo,Xiaofei Zhang,Guanghui Wang,Xiaobo Wang
Single-atom Cu and N co-coordinated porous carbon (Cu-N-C) was synthesized by hydrothermal-calcination using zinc zeolite imidazole frameworks (ZIF-8) as the precursor. The catalyst showed excellent adsorption and catalytic ability due to the ideally-dispersed single atomic copper sites and the unique nitrogen-doped porous carbon. The complete removal of sulfamethoxazole (SMX, 18 mg/L) could be achieved within 40 min of pre-adsorption and 25 min of oxidative degradation in the present of peroxymonosulfate (PMS). The adsorption capacity of Cu-N-C (0.2 g/L) was evaluated to be 58.69 mg/g. The apparent degradation rate constant ( k ) of SMX on Cu-N-C was 0.155 min -1 , which was 14.1 times faster than that on N-C (0.011 min -1 ). From the activation mechanism, it was found that CuN units acted as the main active sites in Cu-N-C for PMS activation . EPR analysis and quenching experiments verified that the reactive oxygen species (ROSs) of SO 4 · - and 1 O 2 were involved in the decomposition and mineralization of SMX. This work provides a new perspective for the development of Fenton-like single-atom catalysts.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2022
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IF 4.383
Bing Xiao,Minghao Xu,Bin Lu,Yun Wang,Hui Liu,Rufen Chen
Economical elimination of organic pollutants from waste water has be paid more attention owing to its environmental and ecological significance. In this study, an easily achievable process to in-situ fabricate copper and co-modified Z-scheme BiOCl/Bi 2 O 3 heterojunction was proposed. The study on the formation mechanism indicated that the introduction of copper ions is favorable for the formation of Bi-based catalyst with flaky morphology while the addition C-dots makes the nanosheets loosely be packed and intercrossed each other. The composite exhibited a high degradation efficiency for Bisphenol A (BPA) and 91% of BPA was removal within 35 min under xenon lamp irradiation. The excellent photocatalytic performance was attributed to the synergistic effect of the in-situ formation Z-scheme BiOCl/β-Bi 2 O 3 heterojunction, multiple charge transfer channels including Cu 2+ /Cu + and C-dots, and efficient charge separation. The electron paramagnetic resonance (EPR) analysis and quenching tests revealed that O 2 •− play a main role in degradation of BPA. Based on the experimental results, the photo-catalytic mechanism is proposed and the degradation path of BPA is revealed.
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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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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Junji Guo,Xungang Diao,Mei Wang,Zhi-Bin Zhang,Yizhu Xie
Electrochromic devices with unique advantages of electrical/optical bistability are highly desired for energy-saving and information storage applications. Here, we put forward a self-driven Al-ion electrochromic system, which utilizes WOx films, Cu foil, and graphite rod as electrochromic optical modulation and graph display electrodes, coloration potential supplying electrodes, and bleaching potential supplying electrodes, respectively. The inactive Cu electrode can not only realize the effective Al3+ cation intercalation into electrochromic WOx electrodes but also eliminate the problem of metal anode consumption. The electrochromic WOx electrodes cycled in Al3+ aqueous media exhibit a wide potential window (∼1.5 V), high coloration efficiency (36.0 cm2/C), and super-long-term cycle stability (>2000 cycles). The dynamic optical modulation and static graph display function can be achieved independently only by switching the electrode connection mode, thus bringing more features to this electrochromic system. For a large-area electrochromic system (10 × 10 cm2), the absolute transmittance value in its color-neutral state can reach about 41% (27%) at 633 nm (780 nm) by connecting the Cu and WOx electrodes for 140 s. The original transparent state can be readily recovered by replacing the Cu foil with the graphite rod. This work throws light on next-generation electrochromic applications for optical/thermal modulation, privacy protection, and information display.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2022
·Vol. 97
·期 7
·1900-1908
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IF 3.709
Yanjie Wu,Huiping Zhang,Ying Yan
BACKGROUND Cu-ZSM-5 was prepared on paper-like sintered stainless steel fibers (PSSF) by ion-exchange method for the catalytic wet peroxide oxidation (CWPO) of phenol in a fixed bed reactor. The prepared Cu-ZSM-5/PSSF catalyst was characterized by scanning electron microscope (SEM), Brunner−Emmet−Teller (BET), X-ray diffraction (XRD), Fourier Transform InfraRed (FT-IR), Ultraviolet–visiblespectroscopy (UV–vis) and X-ray photoelectron spectroscopy (XPS). RESULTS The XRD results showed that the ZSM-5 membrane was loaded well over PSSF with good crystallinity, even after the process of ion-exchange. The UV–vis inferred that isolated copper was the predominant species over ZSM-5 pores of the catalyst. Then, the effects of different catalyst bed heights, reaction temperatures, and feed flow rates on catalytic performance were investigated to obtain optimum reaction conditions. CONCLUSIONS Finally, the catalytic reaction kinetics analysis over Cu-ZSM-5/PSSF catalyst were carried out with the Power-rate Law Kinetic model. The experimental results showed that the reaction order was the first-order reaction, and the activation energy of the oxidation reaction was Ea = 72.9 kJ/mol. The initial oxidation rate equation (−r A0 = 5.36 × 10 8 e −72 994/RT C A ) was obtained for phenol degradation using Cu-ZSM-5/PSSF catalyst. © 2022 Society of Chemical Industry (SCI).
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2022
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IF 9.463
Mulan Cui,Xiaowei Mu,Wei Cai,Xuan Wang,Daolin Ye,Jianchao Xi,Yuan Hu,Weiyi Xing
To enhance the flame retardancy and smoke suppression effects of epoxy resin (EP), three inorganic compounds of copper modified covalent organic frameworks (COFs), COFs@CuO, COFs@Cu 2 O, COFs@Cu(OH) 2 are synthesized. The flame retardancy of EP can be significantly uprated by adding only 2 wt% COFs@Cu 2 O. The PHRR and THR yield of EP/COFs@Cu 2 O decrease by 36.6% and 20.4% compared with that of unmixed EP, respectively. The smoke density of EP/COFs@CuO reduces by 54.3% compared with that of pure epoxy. Moreover, the peak CO yield (COPR) of EP/COFs@Cu 2 O nanocomposites is 42.8% lower than that of unmixed EP. In addition, the impulse strength of EP/COFs@CuO augment 50.7% than that of pure epoxy, and the tensile strength of EP/COFs@CuO is 80.0% higher than that of EP/COFs. The synergy between metallic inorganic compounds and COFs is investigated. This work proves a guidance for preparation of high safety EP.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2023
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IF 3.8
Gaiqin Miao,Lifei Liu,Xia An,Xu Wu
In this work, a high-performance CuNiAl-LDHs catalyst was innovatively synthesized for electrochemical carbon dioxide reduction (CO 2 RR) of methanol (CH 3 OH) through the modulated synthesis of Cu-based layered double hydroxide (LDHs). It was found that the optimal CuNiAl-LDHs has superior CH 3 OH selectivity compared to CuAl-LDHs and CuMgAl-LDHs, with the Faraday efficiency (FE) of 76.4% for CH 3 OH generation at −1.2 V. And their FE and current density (4.8 mA·cm −2 ) remained stable during up to 24 h of electrolysis. Meanwhile, this study confirms the significant performance advantages of CuNiAl-LDHs over their derived composite oxides. Series characterization further proves that the excellent catalytic performance of CuNiAl-LDHs is importantly associated with their richness in Cu + and hydroxyl group (—OH). The research expands the application fields of LDHs compounds. Meanwhile, the series of discoveries provide a new insight for the preparation of CH 3 OH by constructing CO 2 RR.
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MOLECULES
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2023
·Vol. 28
·期 15
·5683
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IF 4.6
Yan Xiao,Nannan Zhan,Jie Li,Yuan Tan,Yunjie Ding
The catalytic upgrading of ethanol into butanol through the Guerbet coupling reaction has received increasing attention recently due to the sufficient supply of bioethanol and the versatile applications of butanol. In this work, four different supported Cu catalysts, i.e., Cu/Al2O3, Cu/NiO, Cu/Ni3AlOx, and Cu/Ni1AlOx(Ni2+/Al3+molar ratios of 3 and 1), were applied to investigate the catalytic performances for ethanol conversion. From the results, Ni-containing catalysts exhibit better reactivity; Al-containing catalysts exhibit better stability; but in terms of ethanol conversion, butanol selectivity, and catalyst stability, a corporative effect between Ni–Al catalytic systems can be clearly observed. Combined characterizations such as XRD, TEM, XPS, H2-TPR, and CO2/NH3-TPD were applied to analyze the properties of different catalysts. Based on the results, Cu species provide the active sites for ethanol dehydrogenation/hydrogenation, and the support derived from Ni–Al–LDH supplies appropriate acid–base sites for the aldol condensation, contributing to the high butanol selectivity. In addition, catalysts with strong reducibility (i.e., Cu/NiO) may be easily deconstructed during catalysis, leading to fast deactivation of the catalysts in the Guerbet coupling process.Keywords:copper catalyst;hydrotalcite;stability;ethanol;butanol
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2023
·Vol. 25
·期 34
·23306-23313
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IF 3.3
Guohui Li,Pengyu Li,Zhi Ge,Dawei Yan,Wei Sun,Yuanyuan Sun,Xiaoxia Zhou
Photocatalytic conversion of carbon dioxide into fuels provides an effective approach to realize carbon resource utilization. However, the photocatalytic efficiency is still relatively low due to the recombination of photogenerated charges. Herein, we have designed Cu-doped SnO2 nanoparticles (Cu–SnO2) using a glucose-involved hydrothermal crystallization method for the photocatalytic reduction of CO2. The rich oxygen vacancies facilitated the separation and transfer of photogenerated charges, and the confined effect of the typical mesoporous structure promoted the adsorption of CO2, especially a high density of grain boundaries (GBs) and the doping of atomic Cu would introduce new active sites to activate CO2 molecules. This elaborately designed catalyst exhibited super and stable photocatalytic conversion activity of CO2-into-CO, with a CO optimal yield of 107 µmol g−1 in 4 h, which was 2.75 times that over pure SnO2. In situ Raman results indicated that the CO2 reduction reaction followed a *COOH pathway on Cu–SnO2. This work provides implications for the construction of a catalyst with rich defects in the field of energy and environmental catalysis.
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ADVANCED MATERIALS
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2023
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IF 29.4
Yingzhen Wei,Shuang Wang,Mengyang Chen,Jinfeng Han,Guoju Yang,Qifei Wang,Jiancheng Di,Hongli Li,Wenzheng Wu,Jihong Yu
Core–shell catalysts with functional shells can increase the activity and stability of the catalysts in selective catalytic reduction of NO x with ammonia x . However, the conventional approaches based on multistep fabrication for core–shell structures encounter persistent restrictions regarding strict synthesis conditions and limited design flexibility. Herein, a facile coaxial 3D printing strategy is for the first time developed to construct zeolite-based core–shell monolithic catalysts with interconnected honeycomb structures, in which the hydrophilic noncompact silica serves as shell and Cu-SSZ-13 zeolite acts as core. Compared to a Cu-SSZ-13 monolith which suffers from the interfacial diffusion, the SiO 2 shell layer can increase the accessibility of active sites over Cu-SSZ-13@SiO 2 , resulting in a 10–20% higher NO conversion at200−550 °C under 300 000 cm 3 g −1 h −1 . Meanwhile, a thicker SiO 2 shell enhances the hydrothermal stability of the aged catalyst by inhibiting the dealumination and the formation of CuO x . Other representative monolithic catalysts with different topological zeolites as shell and diverse metal oxides as the core can be also realized by this coaxial 3D printing. This strategy allows multiple porous materials to be directly integrated, which allows for flexible design and fabrication of various core–shell monolithic catalysts with customized functionalities.
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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 ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Xinran Ji,Tengqian Chen,Chang Shen,Ye Zhao,Ke Zhou,Meiling Sun,Yinghua Yu,Lining Fan,Hui Zheng,Qiong Wu,Qiangyuan Zhang,Yang Zhang
Nickel-copper-zinc (NiCuZn) ferrites with high permeability and low magnetic loss have high application potential in high-frequency electronics. In this work, NiCuZn ferrite samples with different Cu contents were prepared by a two-step sintering method. First, the optimal temperatures of the two-step sintering method (1025/925 °C) were confirmed, thereafter the influence of the Cu content on the crystal structure, microstructure, magnetic and dielectric properties of NiCuZn ferrite were studied in detail. Structural characterization showed that an increase in Cu content promoted grain growth and resulted in NiCuZn ferrites with a denser microstructure and decreased porosity. However, a second phase of CuO formed once the content of Cu (x value) reached 0.16. The magnetic hysteresis loops revealed that the saturation magnetization increased as x increased and the highest value of 57.3 emu/g was obtained at x = 0.14. The dielectric property measurement showed that increasing the Cu content could improve the dielectric constant and reduce the dielectric loss. The permeability measurements showed an increase in permeability with Cu content from x = 0.10 to x = 0.14 and a decrease when x = 0.16. Consequently, a NiCuZn ferrite with an appropriate microstructure and with high permeability (μ'=855), low magnetic loss (tanδ μ = 0.02), and high saturation magnetization (57.3 emu/g) could be obtained at a Cu content of x = 0.14 and sintering temperatures of 1025/925 °C in the two-step sintering method. This NiCuZn ferrite provides new guidance for developing RF frequency multilayer inductors.
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