CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Jianming Wu,Xi Cheng,Yulin Li,Guisheng Yang
In this study, Fe 3 O 4 -nanoparticles-contained polyamide 6 (PA 6) microparticles (FP) were developed by a first dispersion of Fe 3 O 4 -nanoparticles in ε-caprolactam (CL) monomer in the presence of polystyrene (PS) and a subsequent in situ CL open polymerization into PA 6, followed by PS removal. The FP microparticles (as magnetic separation material) and nanochitin (n-CT, as an effective metal-cation natural adsorbent) were then in situ encapsulated into poly(vinyl alcohol)-enhanced chitosan hybrids (PVA/CTS) to form biodegradable nanocomposite hydrogels (FPCC) with magnetic separation ability. The FPCC hybridized hydrogels enabled about 1.7-fold Cu(II) adsorption capacity as compared to the pure PVA/CTS hydrogels with a Cu(II) adsorption value of 38.7 mg/g. More attractively, the adsorption equilibrium could be achieved within 10 min, which is quicker than many previous adsorbents. Furthermore, simulation results indicated that Cu(II) adsorption behaviors of the hybrid hydrogels conform to a pseudo-second-order kinetic model and a Langmuir isotherm model.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Jiahe Li,Xing-Yue He,Xiaowen Wang,Yiwei Lv,Jian-Gong Ma,Bo Li,Peng Cheng
CO2 hydrogenation is one of the key technologies for carbon recycling and greenhouse effect mitigation. Cu-based catalysts have been widely used in the hydrogenation of CO2 to methanol. However, the low catalytic efficiency and instability of Cu-based catalysts limit their industrial application. Herein, a Zr-based metal−organic framework was used to synthesize a Cu NWs@ZrO2 catalyst with a Cu-ZrO2 interface. The Cu NWs@ZrO2 catalyst shows high activity with promising selectivity and excellent stability for the synthesis of methanol from CO2 hydrogenation. Density functional theory calculations and in situ diffuse reflectance Fourier transform infrared spectroscopy confirmed that the CO2 hydrogenation on Cu NWs@ZrO2 followed the HCOO* pathway, and the Cu-ZrO2 interface made a significant contribution to the key intermediate step of CO2 to HCOO* and accelerated the CO2 hydrogenation.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Qing-Shuai Zhang,Yu-Le Wang,Li Yue,Yu-Dong Shan,Song-Hai Wu,Yong Liu,Xu Han
Although selective oxidation of benzene to phenol (SOBP) by H2O2 is an important chemical process, overoxidation of benzene by the produced nonselective •OH during the activation of H2O2 inevitably reduces the oxidation selectivity. We, therefore, attempt to mediate the oxidation selectively by using electrophilic KHCO3 in the oxidation system. In this study, Mo–Cu/NC has been successfully synthesized via ball-milling bimetallic Mo–Cu and N-doped carbon, which exhibits high reactivity in SOBP by H2O2 and KHCO3 with a desirable phenol yield of 25.1% and selectivity of 100%. A series of characterizations and DFT calculations reveal that the reaction between H2O2 and KHCO3 produces HCO4–, which is then moderately activated on Mo1Cu2/NC via the nonradical pathway with the formation of Mo-(η2-O2) peroxo. Meanwhile, Ov at Mo1Cu2/NC facilitates the adsorption of benzene, which is then selectively oxidized by Mo-(η2-O2) peroxo to phenol via the oxygen atom transfer pathway. This study provides new insights on the importance of Mo-(η2-O2) peroxo mediated by H2O2–KHCO3 in selective oxidation of aromatic C–H bond via the nonradical pathway.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Yu Duan,Zihan Ma,Jiaxuan He,Yingying Huang,Shuo Bao,Jinlin Lu
P2-type layered cathode materials have low energy density due to low initial Na content. In this research, high sodium content P2-type cathode material Na0.8Li0.08Ni0.23Mn0.67Cu0.1O1.92F0.08 (NMC-LF), was synthesized by a simple high-temperature solid-phase method. The strong electronegativity of F allows the local TM-O bond to be transformed into a TM-F bond, and the TMO6 octahedron becomes more stable. The doping of Li+ not only maintains structural stability but also transforms the two-phase reaction in the high-voltage range into a solid-solution reaction. This leads to an effective suppression of the irreversible P2–O2 phase transition in the high-voltage region. At 20 mA·g–1, the initial discharge capacity of NMC-LF reaches 131.05 mAh·g–1. At a high current density of 200 mA·g–1, the discharge capacity reaches 101.9 mAh·g–1 and remains at 99.31% after 150 cycles. The diffusion coefficient of NMC-LF is as high as 8.67 × 10–13 cm2·s–1. Furthermore, the structural evolution during material formation is elaborated by high-temperature XRD, and it is determined that there are no impurities at 900 °C. Under the joint synergy of Li/F/Cu and the design of high sodium content, the long-cyclic and high-rate performance has been significantly improved. In-situ XRD tests show that Li/F/Cu codoping inhibits the P2–O2 phase transition and enhances structural reversibility. This provides a new idea for the research of layered cathode materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaobo Min,Han Lu,Yun Li,Changhao He,Yiwei Deng,Yunyan Wang,Cong Peng,Yong Ke,Yanfa Hu,Zhidong Xi,Liyuan Chai
Copper slag cleaning has always been critical for ensuring an efficient copper recovery in copper smelting system. However, current cleaning methods focus on copper enrichment, regardless of zinc and lead recovery. In order to address the severe resource wastage of lead‑zinc values in copper smelting slag, this study proposed an innovative copper slag cleaning technique for efficient and in-situ synergistic sulfidation recovery of Cu, Pb and Zn, and investigated the sulfidation mechanisms. A systematic characterization of copper slag was conducted and revealed that Zn 2 SiO 4 and PbSiO 3 are two of the main occurrence phases lost in slag, respectively, and they are the most difficult phases to recovery. Furthermore, thermodynamic, thermogravimetric analysis and experimental results regarding Zn 2 SiO 4 and PbSiO 3 in-situ synergistic sulfidation by CaSO 4 gypsum residue revealed that PbSiO 3 sulfidation mechanism progressed via CaSO 4 → CaS conversion, followed by diffusion of molten PbSiO 3 to CaS particle surfaces where Pb S bonding produced PbS shells. At the same time, Zn 2 SiO 4 involves calcium-promoted decomposition into ZnO and SiO 2 , and subsequent ZnO-CaS interfacial reaction producing ZnS and CaO. In addition, pilot experiments were conducted to detect the feasibility and stability of the proposed technique. Optimal conditions (12.02% sulfurizing agent dosage, 1 °C/min slow cooling) were determined and achieved comprehensive sulfidation rates of 88.55% Cu, 66.26% Pb, and 59.24% Zn, with effective enrichment as matte. Lead‑zinc sulfides attained flotation-required particle sizes (>40 μm) while residual phases showed minimal metal contents. This study addresses the challenge of lead‑zinc resource wastage in copper slag, introducing a novel approach and methodology for its resource utilization.
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ACS Applied Energy Materials
·
2025
·
IF 5.5
Zhixuan Tan,Bin Liang,Jiaping Yang,Kepan Yan,Jiarong Chen,Xiaoying Liu,Xu Peng,Tangchao Xie,Yijuan Li
Zinc metal is one of the most promising anode materials for aqueous batteries. However, nonuniform deposition of zinc metal anodes and hydrogen evolution reactions (HER) severely affect the stability of aqueous zinc–ion batteries. Herein, a simple redox reaction between zinc metal and graphene oxide and a subsequent one-step replacement reaction were utilized to in situ fabricate rod-shaped zinc oxide, reduced graphene oxide (rGO), and Cu nanoparticles on the zinc anode surface. This ingenious design constructs an artificial gradient zinc-affinity interface layer (ZnO–rGO–Cu), which regulates the longitudinal electric field distribution, enabling Zn2+ to deposit uniformly along the gradient from bottom to top, thereby suppressing the dendrites growth. Besides, Cu nanoparticles and rGO partially isolate the zinc from the electrolyte to inhibit the unwanted HER. Moreover, these components reduce the interface contact angle with aqueous electrolytes, enhancing electrolyte affinity and electrochemical activity. Consequently, the Zn–rGO–Cu symmetric cells cycle stably for 1000 h at 1 mA cm–2, and the half-cells achieve 1500 stable cycles at 2 mA cm–2 with a high Coulombic efficiency of 99%. Furthermore, full cells paired with manganese-based and vanadium-based cathodes stably cycle 900 times at 0.5 A g–1 and 600 times at 2 A g–1, respectively. This study thus provides insights into rationally designing multifunctional interphase layers for high-performance zinc–ion batteries.
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Catalysis Science & Technology
·
2025
·
IF 4.2
Yumei Zhang,Yue Wang,Dongle Wang,Yating Liu,Tong Gao,Qingqiang Zhou,Qingzhi Luo,Jing An,Xueyan Li,Yandong Duan,Desong Wang
A novel Cu–B2O3/porous boron nitride (PBN) composite was developed as a highly efficient and reusable heterogeneous catalyst for the solvent-controlled conversion of arylboronic acids. In water, the catalyst promotes ipso-hydroxylation to phenols, while in methanol, it facilitates aerobic homocoupling to biphenyls, using air as a green oxidant. The synergistic interaction between Cu nanoparticles and B2O3 sites enhances both catalytic activity and stability. This work offers a sustainable and selective approach for synthesizing phenolic and biphenyl compounds under mild conditions.
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RARE METALS
·
2025
·
IF 11
Taichong Chitboonyakasem,Ya Gao,Xinbo Qiu,Jing Peng,Jian Zhou
en The sluggish kinetics of the oxygen reduction reaction (ORR) necessitate developing oxygen electrodes with enhanced electrocatalytic activity for practical zinc–air battery applications. In this study, an iron-doped copper sulfide electrocatalyst (CuFeNS-PNC) anchored on metal–organic framework-derived carbon substrates was designed, featuring a bimetallic Cu 5 FeS 4 architecture where iron electronically modulates copper sites. The performance enhancement of this copper–iron sulfide bimetallic system relative to a monometallic copper sulfide arises from synergistic Fe-Cu interactions, as confirmed by X-ray photoelectron spectroscopy (XPS), revealing electron transfer from iron to copper. Density functional theory (DFT) calculations demonstrate that iron incorporation downshifts the copper d-band center, weakening OH* adsorption energy to a more optimal level, thereby boosting ORR kinetics. Consequently, the CuFeNS-PNC catalyst achieves superior electrocatalytic performance with an ORR onset potential ( E onset ) of 0.988 V and a half-wave potential ( E 1/2 ) of 0.874 V, significantly surpassing commercial Pt/C and conventional metallic sulfide catalysts. When integrated into a zinc–air battery, it delivers a high open-circuit voltage (1.450 V), specific capacity (789 mAh g −1 ), and peak power density (117.9 mW cm −2 ). This work provides valuable guidelines for the rational design and synthesis of electronically modulated metallic sulfides to enhance ORR activity for energy storage and conversion applications. 摘要 zh 氧还原反应 (ORR) 的缓慢动力学过程限制了锌空气电池的实际应用, 因此开发具有优异电催化活性的氧电极材料至关重要。本研究设计了一种负载于金属有机框架衍生碳基底上的铁掺杂铜硫化物电催化剂 (CuFeNS-PNC) , 其结构为双金属Cu 5 FeS 4 , 其中铁元素通过电子调控作用调节铜活性位点。与单金属铜硫化物相比, 该双金属体系的性能提升源于Fe–Cu之间的协同作用。X射线光电子能谱结果表明, 存在从Fe向Cu的电子转移。密度泛函理论计算进一步揭示, 铁的引入使铜的d带中心下移, 优化OH*的结合强度, 进而加速ORR动力学过程。因此, CuFeNS-PNC催化剂表现出优异的电催化性能, 具有0.988 V的氧还原起始电位和0.874 V的半波电位, 显著优于商用Pt/C及常规金属硫化物催化剂。应用于锌空气电池时, 该催化剂实现了高达1.450 V的开路电压、789 mAh g⁻ 1 的比容量以及117.9 mW cm⁻²的峰值功率密度。本研究为通过电子结构调控设计高效金属硫化物催化剂以提升氧还原活性、促进能量存储与转换应用提供了有价值的指导。
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Nanomaterials
·
2025
·Vol. 15
·期 11
·778
·
IF 4.3
Weimin Ning,Mingxuan Li,Lei Jiang,Mei Yang,Maoyan Liu,Yong Liu
Bacterial leaf blight (BLB) is a destructive disease caused byXanthomonas oryzae pv. oryzae(Xoo). It has been proven that BLB adversely influences the growth and production of rice, resulting in substantial losses in yield. Nanoparticle–antimicrobial compounds possess excellent physicochemical properties, which have generated groundbreaking applications in protecting rice against BLB attacks. However, there is less research focused on the interaction between nanoparticles and the microbiome of BLB rice leaves, particularly the structure and function of endophytic bacteria, which are essential to plant health and pathogenesis. Therefore, the study explored how Cu-Ag nanoparticles influenced the endophytic bacteria’s composition and functions in healthy and BLB rice leaves. The data demonstrated that the relative abundance of beneficial bacteria,Burkholderiales,Micrococcales, andRhizobiales, increased after the introduction of Cu-Ag nanoparticles on the leaves of BLB rice. The examination of PAL activity demonstrated that nanoparticles limited the spread ofXooin rice leaves. Furthermore, endophytic community functional prediction demonstrated that nanoparticles may regulate the physiological process associated with potential stress resistance and growth-promoting function in the endophytic communities. This investigation may enhance the understanding of interactions between nanoparticles and the composition of rice endophytic microbiome, which can contribute to the exploration and application of nanomaterials in crop pathogen management.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Lei Wu,Xiuyun Ma,Xiumei Liu,Hong Du,Feng Wang
Hydrogenation of xylose is an important industrial process for the production of xylitol, which is known as a healthy sweetener. In this work, bimetallic phyllosilicate-derived Cu–Ni alloy catalysts were constructed via an ammonia evaporation method followed by reduction under hydrogen and applied for the hydrogenation of a high-concentration xylose aqueous solution for the production of xylitol. The Cu–Ni alloy catalysts exhibited higher xylose conversion than the corresponding monometallic Cu and Ni catalyst. And the xylitol yield was increased with the increase of the ratio of nickel to copper for the bimetallic alloy catalyst. The higher xylose conversion was obtained at elevated reaction temperature and H2 pressure. In addition, reduction conditions, especially temperature, were found to significantly influence the catalytic activity of the phyllosilicate-derived Cu–Ni alloy sample. The 5Cu15Ni-EA catalyst activated at 700 °C exhibited excellent performance for xylose hydrogenation in terms of xylose conversion (>99%) and xylitol selectivity (>99%) under moderate conditions (100 °C and 4 MPa H2). The performance of the 5Cu15Ni-EA catalyst is also superior to the reported consequences of xylitol manufacture via hydrogenation over a Raney nickel catalyst and a co-impregnation-derived bimetallic catalyst. Furthermore, the xylitol yield did not change obviously for 5Cu15Ni-EA during the 200 h of continuous reaction in a fixed bed reactor. The XRD, XPS, HRTEM–EDS mapping, and line scan results of the fresh reduced 5Cu15Ni-EA sample verified the existence of a highly dispersed Cu–Ni alloy. The formation of these uniformly dispersed Cu–Ni alloy sites induced efficient performance for the hydrogenation of a high-concentration xylose aqueous solution.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2025
·
IF 5.6
Xue Wang,Yuanyuan Zhang,Yingying Chen,Qing Ma,Hongzhuo Liu,Shi Jin,Guangqi Yan
Diabetic foot ulcers (DFUs) persist due to excessive reactive oxygen species (ROS), infection, and poor angiogenesis. We engineered an injectable guar gum hydrogel (AuCu-Arg/Gel) embedding gold/copper nanozymes (Au@Cu₂(OH)₃Cl– L -Arg) to address these barriers synergistically. The nanozymes display cascade-mimicking peroxidase, superoxide dismutase, and catalase activities to rebalance ROS. In the acidic, bacteria-laden niche, peroxidase-like activity is switched on, generating hydroxyl radicals (•OH) and driving bacterial viability to < 1 %. Concurrently, the ROS-rich milieu triggers nitric oxide (NO) release from L -arginine (2.93 μM in 10 min), upregulating VEGF and neovascularization. Mild near-infrared (NIR) photothermal heating (1.5 W cm⁻², 5 min) increased the apparent POD-like initial rate 1.94-fold vs no-NIR (see Fig. 2 A). without tissue injury. In diabetic rats, AuCu-Arg/Gel plus NIR accelerated wound closure, dampened inflammation, and increased collagen deposition and vascular density. The results confirmed day-12 residual wound areas to 2.1 % (AuCu-Arg/Gel + NIR). This spatiotemporally programmable platform integrates ROS modulation, on-demand antibacterial action, NO gas therapy, and photothermal enhancement for chronic wound management.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yupeng Wang,Xiangyuan Yu,Shulong Wen,Yihu Sun,Huibin Wei
The effective and economical removal of heavy metal-organic complexes remain an urgent challenge in the field of industrial wastewater treatment. In this study, Ca-doped ferrihydrite composites and Ca/Al co-doped ferrihydrite composites were synthesized via a simple one-step co-precipitation method and applied for the oxidative removal of EDTA-Cu in a hypochlorite system. The incorporation of Al significantly enhanced the material's stability. The Fe-Ca-Al composite exhibited a catalytic degradation efficiency of 97 % after 4 reaction cycles, representing a 32 % improvement compared to the Ca-doped ferrihydrite (Fe-Ca). Mechanistic studies revealed that the Fe-Ca-Al composite demonstrated strong selective adsorption of the organic moieties in EDTA-Cu over a broad pH range. Moreover, the oxygen vacancies (Ov) induced by Ca and Al co-doping played a crucial role in the enhanced catalytic performance and efficient removal of EDTA-Cu. These abundant Ov promoted electron transfer and provided numerous surface adsorption sites, facilitating the conversion of O 2 · - to 1 O 2 . Given that 1 O 2 can rapidly degrade organic compounds containing amino and carboxyl groups, it shows excellent potential for the treatment of EDTA-Cu. This study presents a highly active and reusable catalyst based on a Ca-Al doping strategy, offering a promising approach for the removal of organic-heavy metal complexes.
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