LANGMUIR
·
2023
·
IF 3.9
Wen Chen,Zhiwei Huang,Jiangwei Ni,Qiqi Zhou,Xiaomin Wu,Huazhen Shen,Huawang Zhao,Guohua Jing
Volatile organic compounds such as benzene are hazardous air pollutants that require effective elimination. Noble metal-based catalysts exhibit high benzene combustion activity, but their prohibitive cost necessitates strategies to enhance utilization efficiency. This study investigates a Pt–Cu alloy catalyst for improved benzene combustion by preferentially exposing Pt active sites through Cu alloying. Aberration-corrected scanning transmission electron microscopy and X-ray spectroscopy characterize the nanoscale distribution and enrichment of Pt on the alloy surface. Kinetic measurements demonstrate substantially enhanced activity compared with Pt catalysts, attributed to increased Pt metallic site exposure rather than alteration of the reaction mechanism. In situ Fourier transform infrared (FTIR) spectroscopy reveals a higher abundance of terrace-like Pt sites in the alloy, beneficial for benzene adsorption. Partial pressure dependence analyses indicate competitive adsorption of benzene and O2, following Langmuir–Hinshelwood kinetics. These findings provide conceptual insights into tuning surface composition in bimetallic catalysts to optimize noble metal efficiency, with broad applicability for sustainable catalytic process advancement.
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高影响因子
Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 6
·1-14
·
IF 20.1
Liang Taixin,Song Ruidong,Chen Chong,Alomar Taghrid S.,Xiao Fei,AlMasoud Najla,El-Bahy Zeinhom M.,Yang Yuanyuan,Algadi Hassan,Sun Lufeng
In this work, graphene oxide–supported Cu/Co nano-catalysts with low scale and large surface area were prepared by solvothermal and heat treatment, and the composite of the catalyst and ammonium perchlorate was obtained by spray method. Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) were used to analyze the surface morphology, phase composition, and electronic structure of the catalyst and composites. The Kissinger equation and differential scanning calorimetry (DSC) test were used to determine the thermodynamic data. The results demonstrate that when the heating rate was 5 K/min and the catalyst GO/Cu-Co-MOF-650 was mixed mechanically, the high-temperature decomposition temperature of AP was decreased by 100 °C, and the activation energy was decreased by 38.99 kJ/mol. By using a composite spray instead of mechanical stirring, AP@GO/Cu-Co-MOF-650 completely eliminated the low-temperature decomposition temperature of ammonium perchlorate, increased the high-temperature decomposition temperature by 117.9 °C, decreased the activation energy by 54.24 kJ/mol, and increased the heat release of ammonium perchlorate by more than four times. These results suggest that the composite of the catalyst and the ammonium perchlorate increased the specific surface area of these two materials in contact with one another, further enhancing the catalytic efficiency.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 19
·14859
·
IF 5.6
Yan Xiao,Jie Li,Yuan Tan,Xingkun Chen,Fenghua Bai,Wenhao Luo,Yunjie Ding
Catalytic conversion of biomass-derived ethanol into n-butanol through Guerbet coupling reaction has become one of the key reactions in biomass valorization, thus attracting significant attention recently. Herein, a series of supported Cu catalysts derived from Ni-based hydrotalcite (HT) were prepared and performed in the continuous catalytic conversion of ethanol into butanol. Among the prepared catalysts, Cu/NiAlOxshows the best performance in terms of butanol selectivity and catalyst stability, with a sustained ethanol conversion of ~35% and butanol selectivity of 25% in a time-on-stream (TOS) of 110 h at 280 °C. While for the Cu/NiFeOxand Cu/NiCoOx, obvious catalyst deactivation and/or low butanol selectivity were obtained. Extensive characterization studies of the fresh and spent catalysts, i.e., X-ray diffraction (XRD), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Hydrogen temperature-programmed reduction (H2-TPR), reveal that the catalysts’ deactivation is mainly caused by the support deconstruction during catalysis, which is highly dependent on the reducibility. Additionally, an appropriate acid–base property is pivotal for enhancing the product selectivity, which is beneficial for the key process of aldol-condensation to produce butanol.Keywords:Ni-based hydrotalcite;biomass conversion;support effect;selectivity;stability
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Laser & Photonics Reviews
·
2023
·Vol. 18
·期 1
·2300809
·
IF 11
Xiankun Zheng,Lijin Wang,Jialin Bai,Han Zhang,Hanzhuang Zhang,Aiwei Tang,Wenyu Ji
Currently, the performance of quantum-dot light-emitting diodes (QLEDs) based on environmental-friendly Cu─In─Zn─S quantum dots (QDs) still lags far behind that of Cd-QDs-based devices. Here it is demonstrated that the unique trap-related recombination in Cu─In─Zn─S QDs is mainly responsible for the low device efficiency. The luminous efficiency of Cu─In─Zn─S-based QLEDs is rather sensitive to the temperature and hole-transporting layers (HTLs) due to the susceptible thermal-related trappingdetrapping processes of holes in radiative Cu-related traps. The holes in Cu-related traps can be quenched by escaping to the valence band of the QDs or/and transferring to the adjacent HTLs. An HTL with low highest occupied molecular orbitals is desired to enhance the hole injection and hinder the aforementioned hole transfer. As a result, a high device efficiency of 6.0 cd A −1 is achieved at room temperature, which is attributed to suppressed HTL-induced emission quenching and efficient valence-band-dominated hole injection from HTL to the QDs. The device efficiency is further increased to 13.2 cd A −1 at 150K by suppressing thermal-induced quenching.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Abubakar Yakubu Haruna,Yubo Luo,Zheng Ma,Wang Li,Haiqiang Liu,Xin Li,Qinghui Jiang,Junyou Yang
The thermoelectric performance of n-type Bi2Te3 needs further enhancement to match that of its p-type Bi2Te3 counterpart and should be considered for competitive applications. Combining Cu/Cl and multiscale additives (AgBiSe2) presents a suitable route for such enhancement. This is evidence of the enhanced thermoelectric performance of Bi1.995Cu0.005Te2.69Se0.33Cl0.03. Moreover, by incorporating 0.65 wt % AgBiSe2 (ABS) into Bi1.995Cu0.005Te2.69Se0.33Cl0.03, we further reduce its lattice thermal conductivity to ∼0.28 W m–1 K–1 at 353 K owing to the extra phonon scattering of multiscale ABS. Additionally, the Seebeck coefficient enhances (−183.89 μV K–1 at 353 K) owing to the matrix’s reduced carrier concentration caused by ABS. As a result, we achieve a high ZT of ∼1.25 (at 353 K) and a high ZTave of ∼1.12 at 300–433 K for Bi1.995Cu0.005Te2.69Se0.33Cl0.03 + 0.65 wt % ABS. This work provides a promising strategy for enhancing the thermoelectric performance of n-type Bi2Te3 through Cu/Cl doping and ABS incorporation.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Xiangyang Zheng,Tongyu Han,Haifeng Shi
Photocatalysis combined with peroxymonosulfate (PMS) activation exhibits a great potential prospect in wastewater purification. Unfortunately, the recombination of photogenerated carriers along with insufficient active sites is a bottleneck problem of PMS activation. Herein, Cu-doped Bi 2 WO 6 with oxygen vacancy (V o ) was synthesized via a one-pot solvothermal method to achieve efficient tetracycline degradation with the assistance of the PMS. By adjusting the Cu(NO 3 ) 2 ·3H 2 O amount, the 3Cu-BWO-V o exhibited an optimal photocatalytic tetracycline (TC) degradation rate of 94%, which was 2.7 times higher than pure Bi 2 WO 6 . Photoluminescence (PL), time-resolved photoluminescence (TR-PL), and linear sweep voltammetry (LSV) confirmed that the enhanced catalytic activity was owing to the additional active sites and inhibition of carrier recombination by Cu doping and oxygen vacancy. Cycling experiments further demonstrated the stability and applicability of 3Cu-BWO-V o . This work opens up a new insight into photocatalytic defect engineering and advanced oxidation technology based on PMS for environmental remediation.
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RSC Advances
·
2023
·Vol. 13
·期 38
·26324-26329
·
IF 3.9
Shuhua Cao,Anlin Wang,Kaoxue Li,Zhiteng Lin,Hongwei Yang,Xiaolei Zhang,Jianmei Qiu,Xishi Tai
A novel tetranuclear Cu(II) complex (TNC) was successfully synthesized and characterized by X-ray single crystal diffraction. The interaction of the complex with calf thymus DNA (CT-DNA) has been studied by UV-vis absorption titration, fluorescence technology and molecular docking. The results indicated that TNC could bind to the DNA through an intercalative mode. The agarose gel electrophoresis experiment showed that TNC could cleave supercoiled plasmid DNA into linear DNA. The anticancer activity of TNC was tested on four cancer cell lines: MCF7, A549, 4T1 and HepG2. The results indicated that TNC shown significant activity against all of above cell lines.
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Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Hanjing Zhu,Meng Zhou,Ke Jing,Baohong Tian,Yi Zhang,Xu Li,Yunzhang Li,Xianhua Zheng,Heng Li,Zipeng Ma,Yong Liu,Alex A. Volinsky,Jin Zou
The 0.5Y 2 O 3 /Al 2 O 3 -Cu/30Mo3SiC and 0.3GO-0.5Y 2 O 3 /Al 2 O 3 -Cu/30Mo3SiC composites were fabricated by fast hot press sintering. Hot compression tests of the composites were carried out using the Gleeble-1500 simulator at 0.001–10 s −1 strain rates and 650–950 °C deformation temperatures. The effects of doped reduced graphene oxide (rGO) on the hot deformation behavior and microstructure of 0.5Y 2 O 3 /Al 2 O 3 -Cu/30Mo3SiC composites were investigated. Trace of molybdenum carbide (MoC) layers/nanoparticles formed in-situ at the rGO-Cu/Mo interface, which is beneficial to the interfacial bonding of the composite. The enhanced flow stress and activation energy of hot deformation is attributed to the addition of the rGO. The activation energy of the composites was improved by 11% with the addition of rGO. The dislocation density and texture orientation ratio decrease at higher deformation temperatures.
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POLYMER BULLETIN
·
2021
·Vol. 79
·期 2
·1201-1216
·
IF 2.87
Yu Changjiang,Li Han,Ma Haoyue,Zhang Limei,Li Yu,Lin Qiang
A magnetic composite microsphere, calcium alginate (CA)/carboxymethyl cellulose (CMC)@MnFe 2 O 4, was prepared using CA and CMC encapsulated MnFe 2 O 4 through blending and cross-linking for the removal of Cu(II) from aqueous solution. The CA/CMC@MnFe 2 O 4 was characterized in detail by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and X-ray phosphorescence spectroscopy. In addition, various adsorption conditions including the initial pH of Cu(II) solution, equilibrium contact time, and initial Cu(II) concentration were tested. The adsorption data fit better to the Langmuir isotherm and follow the pseudo-second-order model, suggesting that it is a monolayer adsorption process with chemisorption as the rate-limiting step. The maximum adsorption capacity of the CA/CMC@MnFe 2 O 4 was 77.22 mg g −1 at 25 ℃ and pH 5. Cu(II) removal mechanisms of CA/CMC@MnFe 2 O 4 follow ion exchange as well as the formation of complexes as evidenced based on the microstructure analysis and adsorption data fitting.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Shabab Hussain,Xinyi Wan,Zhuoyi Li,Xinsheng Peng
The major obstacle in membrane filtration technology is the membrane fouling, which not only decreases the membrane efficiency, but also enhances its operational cost. In order to fabricate a membrane with antifouling characteristics, potential nanofillers have been added to the engineering polymer(s) to make a composite to improve the membrane efficiency. Herein, we incorporate porphyrin-based ultrathin, highly ordered porous photothermal responsive copper tetrakis(4-carboxyphenyl)porphyrin (Cu-TCPP) nanosheets as a novel nanofillers into the polysulfone (PSf) matrix. High loading (6 wt%) and well dispersed Cu-TCPP nanosheets incorporated polysulfone nanocomposite (Cu-TCPP/PSf) ultrafiltration membranes are prepared via non-solvent induced phase inversion. The Cu-TCPP/PSf composite membranes demonstrate pronounced antifouling and antibiofouling potential along good separation performance. The nanocomposite membranes demonstrate photo-induced pore tuning due to the local heating of photothermal Cu-TCPP nanosheets by visible light, which further improves the membrane separation efficiency. The Cu-TCPP/PSf composite membrane with 6 wt% Cu-TCPP nanosheets enhances the pure water permeance from 23.42 to 260.61 L·m −2 ·h −1 ·bar −1 , with improved antifouling potential, precise permeance recovery ratio of 99.13% after three cycles, and good separation performance for 100 and 200 nm particles. Considering relatively moderate cost, facile processing, tunable porosity, durable and good mechanical strength along restrained swelling, the Cu-TCPP/PSf membranes are considered as potential candidate as antifouling/antibiofouling ultrafiltration membranes for water purification.
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JOURNAL OF SUPERCRITICAL FLUIDS
·
2021
·
IF 4.577
Jian-Lei Qi,Qin-Qin Xu,Dan Zhou,Jian-Zhong Yin,Qi-Ke Jiang
Cu single atoms dispersed on N-doped carbon materials (Cu-NC) were obtained after supercritical CO 2 deposition and decompression, without further post-treatment. AC-HAADF-STEM, STEM , XRD , ICP-OES, and XPS results confirmed that the Cu atoms were equably dispersed over the N-doped carbon (NC) support with the loading of 0.80 wt%. The catalytic performance of Cu-NC in solvent-free oxidation of phenylcarbinol to benzaldehyde was investigated, and the conversion of 73.9% and selectivity of 85.7% were obtained at 50 °C for 1 h. A high-pressure view cell was used to observe the dissolution and diffusion for Cu(acac) 2 in scCO 2 . The stability of Cu-NC structures and the formation path of active oxygen species (O*) on different configurations were predicted by density functional theory (DFT) calculations, and CuN 3 C 1 was found to be more conducive to the activation of tert-butyl hydroperoxide (TBHP).
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REACTIVE & FUNCTIONAL POLYMERS
·
2021
·
IF 3.975
Yingdong Duan,Qizheng Li,Biyun Peng,Shaobo Tan,Zhicheng Zhang
In the present work, diverse vinyl monomers were successfully grafted onto poly(vinylidene fluoride-hexafluoropropylene) P(VDF-HFP) via direct activation of C F bonds using Cu(0)/4,4′-dimethyl-2,2′-bipyridyl (DMDP) as catalyst under mild conditions. The structure of the graft copolymer was carefully characterized, and the initiating site was confirmed at the same time. Moreover, the kinetic results indicated the controlled behavior of the graft polymerization, and the composition of the graft copolymer can be regulated by changing the reaction conditions. This work may provide a facile strategy to endow P(VDF-HFP) copolymer with new functions via directly activating C F bonds.
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