ACS Applied Nano Materials
·
2023
·
IF 5.9
Jinqing He,Tong Dou,Shuteng Diao,Yiping Wang,Xuhui Zhao,Fazhi Zhang,Xiaodong Lei
The reduction of carbon dioxide to valuable chemical products is a hot topic of current research. In this article, Cu nanoparticle-decorated Fe3O4 (Cu/Fe3O4) is prepared by using layered double hydroxide (LDH) as the precursor. The CuFe-LDH is synthesized using the coprecipitation method and further reduced to obtain the final material Cu/Fe3O4. The uniform layered structure of LDH results in highly dispersed metallic elements in the corresponding Cu/Fe3O4, in which Cu atoms provide Cu0 and Cu+ pairs and good electrical conductivity during the reduction process with Fe3O4 as the framework. Therefore, Cu/Fe3O4 shows high selectivity for CO2 electroreduction to ethanol, in which the Faraday efficiency is 50.9% at −0.3 V vs RHE. Experimental results show that Cu/Fe3O4 generates uniformly distributed Cu+ sites during CO2 electroreduction, which is conducive to the formation of *CHO, a key intermediate to ethanol. This study provides a design method for catalysts of CO2 electroreduction with feasibility.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 107
·期 13
·4301-4309
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IF 5
Wang Xueqin,Chen Xuyang,Liu Junyan,Tao Haizhen,Shao Ninghan,Li Wenlin,Huang Shiyu,Zhang Xiyan,Li Na
Abstract Total antioxidant capacity (TAC) is currently considered as a vital indicator of food quality in antioxidant ability and attracts much attention for human healthcare. It is thus of great significance to realize the accurate and rapid detection of TAC in foods. Herein, we have constructed a preferable hybrid nanozyme based on the mesoporous silica-stabilized CuO composited Fe 3 O 4 nanoparticles (Fe 3 O 4 @MSNs@CuO, FMC NPs), which possess the enhanced peroxidase (POD)-like activity via cascade response for specific and sensitive determination of TAC in fruit foods. The results showed the hybrid nanozyme displayed a remarkable POD-like activity, excellent selectivity and sensitivity, and the limit of detection (LOD) of the colorimetric sensor was 6.13 mM with the concentration range from 10 to 45 mM. Therefore, the fabricated hybrid nanozyme can be regarded as an effective biosensor for the evaluation of antioxidant quality in fruit foods in future. Key points
• The stabilized bimetallic nanozyme was constructed for TAC analysis in fruits.
• The hybrid nanozyme possessed the enhanced POD-like activity by cascading effects.
• The nanozyme was an effective biosensor for antioxidant quality evaluation in fruits.
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Materials Chemistry Frontiers
·
2021
·Vol. 6
·期 1
·103-116
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IF 6.482
Li Yu,Tiantian He,Jia Yao,Wendi Xu,Shuping Peng,Pei Feng,Cijun Shuai
Developing a novel antibacterial material with highly effective and long-lasting antibacterial activity to prevent bacterial infection during or post bone scaffold transplantation is an urgent need for bone regeneration. In this study, a synergistic antibacterial system for a polyglycolic acid (PGA) scaffold was constructed by cation exchange of montmorillonite (MMT) with Cu2+ and then intercalation of cetyltrimethylammonium bromide (CTAB) into the interlayer of MMT. On one hand, the introduced Cu2+ enlarged the interlayer spacing of MMT, facilitating the intercalation of CTAB into the MMT interlayer to impart the antibacterial effect. On the other hand, the intercalation of CTAB into MMT shifted the surface potential of MMT from negative to positive, improving the bacterial adsorption capacity by electrostatic forces so that Cu2+ could act directly on the negatively charged bacteria. As a result, the bacterial adsorption rate of Cu2+ and CTAB modified MMT (Cu-CMMT) improved by 76.5% compared with that of MMT, which could be explained by the increased zeta potential from −26.1 to 19.7 mV. Besides, the scaffold with Cu-CMMT exhibited robust antibacterial activities against E. coli with an antibacterial rate of 98.1%, which was significantly higher than that of the scaffold with Cu2+ or CTAB modified MMT individually. The scaffold with Cu-CMMT exhibited the highest level of reactive oxygen species (ROS), which was attributed to the dilapidation of bacterial cells.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2021
·
IF 2.262
Lili Yan,Siyu Jiang,Pinhua Rao,Guanghui Li,Zongdi Hao,Lei He,Shanliang Liu,Guofeng Shang
Rice hull biochar modified by ZnS nanocrystals (RBZ) was developed as an efficient absorbent for the removal of Cu(II) in aqueous solution. Response surface methodology (RSM) was applied for modeling and optimizing the performance of RBZ. The maximum adsorption capacity of RBZ toward Cu(II) through the Langmuir model fitting was 248.98 mg g−1, which was four times larger than that of rice hull biochar (RB). The adsorption kinetics of Cu(II) and XPS analysis revealed that the chemisorption process played the leading role when using RBZ. Through competition ions study, Pb(II), Cd(II), or Ca(II) can slightly reduce the adsorption of Cu(II). According to the Box Behnken design method, the analysis of variance results showed that the pH and adsorbent dosage had significant effects on the predicted responses of adsorption capacity and removal efficiency. When using the optimum conditions, pH 6, temperature 27 °C, and dosage 0.20 mg mL−1 for removing Cu(II) in solution, the maximum adsorption capacity and relatively higher removal efficiency could be obtained through the 3D response surface plots. The results demonstrated that RSM is feasible to achieve optimal conditions for adsorption capacity and removal efficiency simultaneously toward heavy metals from aqueous medium, and the interaction between them when using the biochar/ZnS composite.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Yanjie Duan,Zhixiong Huang,Xiangbin Dong,Jingyu Ren,Lin Lin,Shuhong Wu,Runping Jia,Xiaowei Xu
Transition metal oxalates have attracted people's attention owing to their low cost, low lithium insertion potential and high theoretical reversible capacities. Disappointingly, high irreversible capacity thanks to the formation of SEI as well as the consumption and exfoliation of active materials during the process of cycling severely restrict its application of it. In this work, a comprehensive evaluation of Co, Ni, Cu and Zn doped manganese oxalate was made. All samples are synthesized via facile and time-saving microwave hydrothermal method . It is intriguing that merely 30 min is required to accomplish the entire process and all samples possess fine electrochemical performance. As far as the four bimetallic oxalates, the resulting Mn 0·5 Ni 0·5 C 2 O 4 exhibits the optimum performance (746.2 mA h g −1 after 100 cycles at 0.2 A g −1 and 546.7 mA h g −1 at 1 A g −1 after 400 cycles), which can be attributed to one-dimensional rod-like morphology of Mn 0·5 Ni 0·5 C 2 O 4 as well as the synergistic and catalytic effect of Mn and Ni, resulting in faster electrode kinetics . Mn 0.5 Ni 0.5 C 2 O 4 displays incalculable potential and can be applied in the highly reversible lithium-ion batteries.
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CHEMOSPHERE
·
2021
·
IF 7.086
Liuting Mo,Yi Tan,Yulin Shen,Shifeng Zhang
Cellulose-based aerogels have considerable potential for various application due to renewable, low cost, and high availability. However, mechanical robustness and functionalization remain major challenges. Here, we synthesized a compressible, recoverable cellulose nanofiber (CNF)/carboxymethyl cellulose (CMC)/branched polyethyleneimine (BPEI) aerogel via electrostatic-modulated interfacial covalent crosslinking and freeze-drying process. The porous BPEI@CNF/CMC aerogel possessed excellent mechanical compression and high-density metal-chelating groups, which exhibited fast adsorption kinetics and high adsorption capacity (452.49 mg g −1 ) in static copper adsorption process. Furthermore, BPEI@CNF/CMC aerogels displayed excellent recyclability and could still reach 85% after 10 cycles. The integrated analyses of ATR-FTIR and XPS suggested that the predominant adsorption mechanism included electrostatic interaction, ion-exchange and chelation. This strategy provides a sustainable route to fabricate efficient biomass-based adsorbents for selective copper removal from water.
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SENSORS AND ACTUATORS B-CHEMICAL
·
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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FUEL
·
2023
·
IF 7.4
Xin Guo,Zhiyong Ding,Na Kang,Liu Yang,Yuanjiang Wang,Cheng Zhang,Zhaoqiang Li,Tiantian Zhang,Yan Wang,Yu Wang,Hao Qu
The zeolite-based catalyst is a promising option for the selective catalytic reduction (SCR) of nitrogen oxides (NO x ) due to its low toxicity. However, the challenge lies in its low-temperature activity. This study developed a multi-component catalytic system consisting of Ce/Mn/Cu-loaded Beta zeolite to reduce NO x . With fixed contents of Cu and Mn, we investigated the NH 3 -SCR process and the mechanism of action of the rare-earth species (i.e., Ce) in the system. Upon optimization of the content of Ce, the Ce/Mn/Cu-loaded Beta zeolite demonstrated enhanced low-temperature activity compared to samples loaded with Cu or Cu/Mn in the temperature range of 150–250 °C. When Ce was loaded in an appropriate proportion, it regulated the oxidation state of Cu, optimizing active adsorption species for NO and strengthening the strength of Brønsted acid sites in the catalyst. These synergetic effects led to improved NH 3 -SCR catalytic performance. This study can contribute to a better understanding of multiple metal-loaded zeolites in the NH 3 -SCR process and inform future design of Beta-type catalysts.
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Engineering
·
2023
·
IF 12.8
Ning Li,Haoxi Dai,Mengting He,Jun Wang,Zhanjun Cheng,Beibei Yan,Wenchao Peng,Guanyi Chen
The distribution pattern of metals as active centers on a substrate can influence the peroxymonosulfate (PMS) activation and contaminants degradation. Herein, atomic layer deposition is applied to prepare Cu single atom (SA-Cu), cluster (C-Cu), and film (F-Cu) decorated MXene catalysts by regulating the number of deposition cycles. In comparison with SA-Cu-MXene (adsorption energy ( E ads ) = −4.236 eV) and F-Cu-MXene ( E ads = −3.548 eV), PMS is shown to adsorb preferably on the C-Cu-MXene surface for activation ( E ads = −5.435 eV), realizing higher utilization efficiency. More SO 4 − · are generated in C-Cu-MXene/PMS system with steady-state concentration and 1–3 orders of magnitude higher than those in the SA-Cu-MXene and F-Cu-MXene activated PMS systems. Particularly, the contribution of SO 4 − · oxidation to sulfamethoxazole (SMX) degradation followed the order, C-Cu-MXene (97.3%) > SA-Cu-MXene (90.4%) > F-Cu-MXene (71.9%), realizing the larger SMX degradation rate in the C-Cu-MXene/PMS system with the degradation rate constants ( k ) at 0.0485 min −1 . Additionally, SMX degradation routes in C-Cu-MXene/PMS system are found with fewer toxic intermediates. Through this work, we highlighted the importance of guided design of heterogeneous catalysts in the PMS system. Appropriate metal distribution patterns need to be selected according to the actual water treatment demand. Metal sites could be then fully utilized to produce specific active species to improve the utilization efficiency of the oxidants.
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Hui-Juan Wang,Bing-Hao Wang,Xiao-Yuan Hu,Sha Bai,Lang Chen,Shuang-Feng Yin
Cu content tunes site occupancy (octahedral or tetrahedral) for active site design. • Cu-Co 3 O 4 -7% induces higher spin Co 3+ , weakens Co–O, boosts O latt reactivity. • Cu-Co 3 O 4 -7% achieves complete CO conversion at 150 °C via O latt -mediated mechanism. • Linking occupancy, spin, bond length to performance for O latt catalyst design. Metal doping represents an effective strategy for modulating the electronic structure of cobalt spinel oxides and tailoring catalytic performance. However, the precise site occupancy of dopants in Co 3 O 4 lattice, octahedral versus tetrahedral, remains a subject of debate, hindering a mechanistic understanding of the promotional role of metal doping. In this study, by adjusting the doping amount of Cu (Cu-Co 3 O 4 -x%, x represents the amount of doped Cu), site-specific incorporation of Cu into either octahedral or tetrahedral sites of Co 3 O 4 was precisely controlled. The resulting Cu-Co 3 O 4 -7% achieves the highest CO oxidation activity under a high gas hourly space velocity. It is revealed that Cu doped in octahedral sites promotes the transition of Co 3+ from low spin to higher spin states. This spin-state transition weakens the Co 3d−O 2p interaction, facilitates lattice oxygen mobility, optimizes CO adsorption, and collectively enhances CO oxidation. This work provides a targeted approach for regulating the Co 3+ spin state and elucidates its critical role in molecular activation processes.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Hanzi Liu,Xinlin Xie,Lei Liu,Zhigang Yi,Xing Peng,Pansong Li,Zhiqiang Sun
Solid-phase DFMs yielded 0.65 mmol g −1 CH 3 OH in ICCU at 300 °C and 30 bar. • Ga promoted methanol production by optimizing the Cu-ZnO x interface. • Cu-ZnO x promoted CO 2 migration and activation for CH 3 OH synthesis. • DFT, AIMD, and DRIFTS revealed formate hydrogenation pathways. • Cu-ZnO x interfaces enable ZnO to Cu electron transfer, lowering barriers by 0.51 eV. The development of dual functional materials (DFMs) for cyclic CO 2 capture and hydrogenation is essential for converting diluted CO 2 into valuable C 1 products, yet remains challenging due to inherent trade-off between CO 2 conversion and CH 3 OH selectivity over catalysis center. Herein, we engineered a series of copper-based materials and for selective hydrogenation of CO 2 to CH 3 OH. The highly dispersed Cu-ZnO-Ga catalyst demonstrated exceptional methanol formation activity of 0.65 mmol g −1 at 300 °C and 30 bar in 1 h hydrogenation time. Through a quantitative investigation of coordination environments, we revealed that pressure-induced conditions promote Cu 0 nanoparticle migration toward ZnO x species, generating synergistic Cu 0 -Zn δ+ interfacial sites. These interfaces facilitated CO 2 activation via a deoxygenation pathway, while carbonates remain inert during hydrogenation. Combined in situ spectroscopy and theoretical calculations demonstrated that stable formate and methoxy intermediates on Cu 0 -ZnO x facilitated heterolytic C O scission and C H bonding, significantly lowering the energy barrier for activating captured CO 2 .
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Frontiers in Bioengineering and Biotechnology
·
2023
·
IF 5.7
Mingxiang Liu,Lei Zheng,Kangkang Zha,Yayan Yang,Yunping Hu,Kai Chen,Feng Wang,Kunyu Zhang,Wei Liu,Bobin Mi,Xiufeng Xiao,Qian Feng
The regeneration of skin tissue is often impeded by bacterial infection seriously. At the same time, reactive oxygen species (ROS) are often overexpressed in infected skin wounds, causing persistent inflammation that further hinders the skin repair process. All of these make the treatment of infected wounds is still a great challenge in clinic. In this study, we fabricate Cu(II)@MXene photothermal complex based on electrostatic self-assembly between Cu 2+ and MXene, which are then introduced into a hyaluronic acid (HA) hydrogel to form an antibacterial dressing. The rapid adhesion, self-healing, and injectability of the dressing allows the hydrogel to be easily applied to different wound shapes and to provide long-term wound protection. More importantly, this easily prepared Cu(II)@MXene complex can act as a photothermal antibacterial barrier, ROS scavenger and angiogenesis promoter simultaneously to accelerate the healing rate of infected wounds. Our in vivo experiments strongly proved that the inflammatory condition, collagen deposition, vessel formation, and the final wound closure area were all improved by the application of Cu(II)@MXene photothermal hydrogel dressing.
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