Journal of Environmental Sciences
·
2016
·
IF 2.208
Jixing Liu,Fuhong Yu,Jian Liu,Lifeng Cui,Zhen Zhao,Yuechang Wei,Qianyao Sun
A series of meso-microporous Cu-SAPO-34 catalysts were successfully synthesized by a one-pot hydrothermal crystallization method, and these catalysts exhibited excellent NH 3 -SCR performance at low temperature. Their structure and physic chemical properties were characterized by means of X-ray diffraction patterns (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), N 2 sorption-desorption, nuclear magnetic resonance (NMR), Inductively Coupled Plasma-Atomic Emission spectrometer (ICP-AES), X-ray absorption spectroscopy (XPS), Temperature-programmed desorption of ammonia (NH 3 -TPD), Ultraviolet visible diffuse reflectance spectroscopy (UV-Vis DRS) and Temperature programmed reduction (TPR). The analysis results indicate that the high activities of Cu-SAPO-34 catalysts could be attributed to the enhancement of redox property, the formation of mesopores and the more acid sites. Furthermore, the kinetic results verify that the formation of mesopores remarkably reduces diffusion resistance and then improves the accessibility of reactants to catalytically active sites. The 1.0-Cu-SAPO-34 catalyst exhibited the high NO conversion (> 90%) among the wide activity temperature window in the range of 150–425°C.
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Journal of Materials Chemistry A
·
2012
·Vol. 1
·期 4
·1319-1325
·
IF 0
Xiaoyong Qiu,Shuhua Han,Meng Gao
Rhodamine-6G Schiff-base bridged periodic mesoporous organosilicas (RSPMOs) were successfully synthesized by co-condensation of rhodamine Schiff-base derivative-bridged organosilanes and tetraethoxysilane (TEOS), using the ionic liquid 1-hexadecyl-3-methylimidazolium bromide (C16mimBr) as a structure-directing agent. The formation mechanism of ordered mesoporous hybrid materials with crystal-like pore walls was mediated by the self-assembly of both the long-chain ionic liquid and the new organosilane precursors. As the molar fraction of the new organosilane precursors was above 1%, hybrid materials with crystal-like pore walls were obtained, which was due to the face-to-face π–π interaction between rhodamine moieties of the new organosilane precursors within the framework. Little or no fluorescence emission of the hybrid material with rhodamine Schiff-base units was observed because of the existence of spirolactam in rhodamine moieties before chelating with metal ions. However, a dramatic enhancement in fluorescence emission was shown due to opening of the spiro structure in rhodamine moieties, which was induced by intramolecular charge transfer from metal ions to rhodamine units when the hybrid materials chelated with corresponding metal ions. RSPMOs showed high sensitivity and selectivity towards Cu2+ in aqueous solutions with good tolerance for other metal ions, showing great superiority in practical application.
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MOLECULES
·
2022
·Vol. 27
·期 15
·4712
·
IF 4.927
Yu Lei,Bin He,Shujun Huang,Xinyan Chen,Jian Sun
Facile construction of functional nanomaterials with laccase-like activity is important in sustainable chemistry since laccase is featured as an efficient and promising catalyst especially for phenolic degradation but still has the challenges of high cost, low activity, poor stability and unsatisfied recyclability. In this paper, we report a simple method to synthesize nanozymes with enhanced laccase-like activity by the self-assembly of copper ions with various imidazole derivatives. In the case of 1-methylimidazole as the ligand, the as-synthesized nanozyme (denoted as Cu-MIM) has the highest yield and best activity among the nanozymes prepared. Compared to laccase, theKmof Cu-MIM nanozyme to phenol is much lower, and thevmaxis 6.8 times higher. In addition, Cu-MIM maintains excellent stability in a variety of harsh environments, such as high pH, high temperature, high salt concentration, organic solvents and long-term storage. Based on the Cu-MIM nanozyme, we established a method for quantitatively detecting phenol concentration through a smartphone, which is believed to have important applications in environmental protection, pollutant detection and other fields.Keywords:laccase;phenolic oxidation;nanozyme;intelligent detection;self-assembly synthesis
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 25
·6645-6653
·
IF 3.286
Ma Xin,Lin Shijun,Dang Yunfei,Dai Yu,Zhang Xiaojin,Xia Fan
Carbon dot (CD)-based fluorescent probes have been widely exploited; however, multi-component detection using CDs without tedious surface modification is always a challenging task. Here, we develop a convenient and simple CD-based “on-off-on” fluorescent probe for detection of copper(II) ion (Cu 2+ ), ascorbic acid (AA), and acid phosphatase (ACP). Cu 2+ leads to the fluorescence quenching of CDs. The limit of detection (LOD) for Cu 2+ is 2.4 μM. When AA is added into the CDs + Cu 2+ solution, Cu 2+ is reduced by AA to Cu + , causing the fluorescence recovery of CDs. The fluorescent intensity linearly correlates with the concentration of AA in the range of 100–2800 μM with LOD of 60 μM. Besides, the probe has potential application for detection of AA in real samples such as VC tablets, orange juice, and fresh orange. The probe can also indirectly detect ACP that enzymatically hydrolyzes ascorbic acid-phosphate (AAP) to produce AA. This work expands the application of CDs in the multi-component detection and provides a facile fluorescent probe for detection of AA in real samples.
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JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Zheng Meiru,Liu Ying,Qiao Peng,Wang Xueqin,Guo Xin,Zhang Mei,Zhang Jiaojing,Zhang Jianwei,Feng Fuping
Photocatalysis technologies for degrading organic pollutants have emerged as a promising strategy for environmental remediation. This study aimed to develop efficient photocatalysts by synthesizing TiO 2 -loaded composites derived from CuZnAl layered double hydroxides (LDHs) and assessed their performance in the decomposition of rhodamine B (RhB). CuZnAl-LDH nanosheets were synthesized via coprecipitation and then calcined at high temperatures to obtain CuZnAl layered double oxides (CZA-LDO). By varying the amount of ascorbic acid, the CuO in CZA-LDO was reduced to different extents, thereby varying the ratio of Cu, Cu 2 O and CuO. TiO 2 was then deposited on the surface. The morphology, crystal structure, bonding state, and photocatalytic performance of the composite materials were assessed. When exposed to UV light, the optimized TiO 2 /Cu–Cu 2 O–CuO–0.7 composite material achieved a degradation rate of 96.0% for RhB within 110 min, which was significantly better than TiO 2 /CZA-LDO (46.0%) and other Cu-modified samples (66.2%–77.9%). The enhanced photocatalytic properties of the prepared nanocomposite were ascribed to doping with Cu, Cu 2 O and CuO, which effectively enhanced the electron–hole pair separation efficiency. These findings demonstrate the potential of Cu-Cu 2 O-CuO-LDO-based photocatalysts as effective materials for degrading organic contaminants in environmental remediation. Graphical abstract
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Li Ma,Xiong Zhao,Zijuan Luo,Zhenzhen Chen,Jinjia Wei,Nanjing Hao
Porphyrin-based metal–organic frameworks are widely utilized in the photocatalytic field owing to their unique photosensitive properties. Whereas controllable substrate morphology and uniform distribution of the noble metal nanoparticles still remain challenging in traditional synthesis. Herein, Cu-TCPP@MOFs and PtNPs/Cu-TCPP@MOFs with flower-like architecture were produced via continuous flow strategy and double spiral microreactor efficiently and controllably. The results revealed that 5.2 wt% Pt nanoparticles with 2.68 nm were embedded evenly on the Cu-TCPP@MOFs within 5 min. Compared to the Cu-TCPP@MOFs, the PtNPs/Cu-TCPP@MOFs exhibited much superior catalytic performance for rhodamine B (RhB) degradation under visible-light-driven, the reaction rate constant and catalytic activity parameter increased from 0.010 to 0.027 min −1 , and 0.03 to 11.25 s·g −1 , respectively. The free radical capture experiments revealed that h + , ·OH, and ·O 2 − played a synergistic role in the RhB degradation, whereas ·OH plays the most prominent effect. The reasonable degradation pathways of RhB were proposed by combining the density functional theory (DFT) with liquid chromatography mass spectrometry (LC-MS) investigation. This work not only provided insights into the design and controllable preparation of high-performance photocatalysts but also provided an effective strategy for degrading organic pollutants in the water environment, which poses significant environmental and economic benefits.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Yajuan Tu,Yuxin Hou,Xinyang He,Ming Ouyang,Ruoyi Chen,Xiang Wang,Xingyun Guan,Peng Liu,Mingli Fu,Steven L. Suib,Pingxiao Wu,Daiqi Ye
Natural nanofibrous palygorskite with micropores, nanotubular halloysite with mesopores, and disc-shaped diatomite with macropores exhibit distinct advantages in dispersing metal oxide particles due to their regular porosity, mechanical adhesion, and thermal stability. Three natural porous minerals with typical morphology were employed as supports for Cu-Co oxides in the catalytic oxidation of butyl acetate. XRD and Raman reveal that spinel-structured Cu 0.72 Co 2.28 O 4 and tenorite-structured CuO are main phases on three supports, while SEM and TEM suggest that halloysite and palygorskite are better than diatomite in dispersing Cu-Co oxide particles. Due to high dispersion, superior reducibility, and moderate Co 3+ -O 2- , the halloysite-supported Cu-Co oxides exhibit the lowest T 50 of butyl acetate conversion at 232 °C among three supported catalysts. Natural porous supports modulate the spinel lattice, improve the adsorption of butyl acetate, provide surface hydroxyls in oxidation, and enhance the thermal stability of Cu-Co oxides. The gaseous O 2 supplements the surface chemisorbed oxygen and lattice oxygen, which participate in the complete oxidation of butyl acetate. Above results indicate that natural porous minerals are potential supports to transition metal oxides for VOCs oxidation.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Shuai Hu,Xiaoxuan Zhu,Yan Zhu,Chenliang Zhou,Gewen Yu,Yanming Wang,Cong Wang,Zhenfeng Wang,Jian Ding,Yuqing Wang,Xiaohui Guo
To enhance the activity and selectivity of Cu-based catalysts in the CO 2 hydrogenation reaction, this study systematically investigated the regulation effect of Nd-doping on the structure and surface properties of different oxide support (MgO, Al 2 O 3 , ZrO 2 , and CeO 2 ), and further explored its influence on the state of Cu species as well as the catalytic performance in CO 2 hydrogenation to methanol. The results show that the introduction of Nd 3 + can effectively induce lattice distortion of the support which promotes the generation of oxygen vacancies and the formation of surface basic sites, thereby enhancing the interfacial electronic interaction between Cu and support and improving the stability of Cu + active centers. Among them, the Cu catalyst supported on Nd-doped ZrO 2 exhibited the best catalytic performance such as the high CO 2 conversion and selectivity to methanol. Various characterization (XRD, SEM, in-situ XPS, H 2 -TPR, CO 2 -TPD, and H 2 -TPD) results confirmed the key role of Nd-doping in regulating the oxygen defects, electronic structure, and Cu species distribution over support. This study reveals the structural regulation mechanism of Nd in constructing efficient Cu-based catalysts for CO 2 hydrogenation from the perspective of support engineering, providing theoretical basis and practical guidance for the design of new high-performance catalytic materials.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Ke Wang,Yuqing Huang,Shiyong Sun,Haoming Tang,Lin Gong,Dongdong Wang,Xueyan Zhang,Sen Lin
The detoxification and valorization of toxic p-nitrophenol (p-NP) and its ester derivatives into high-value p-aminophenol (p-AP) present a significant challenge in green chemistry. This work addresses this challenge by developing a hybrid catalyst through the co-immobilization of lipase and a novel bimetallic Cu/Mn aminoclay nanozyme (CMAC) onto montmorillonite (Mt). The key innovation lies in the multifunctional design of CMAC, which serves not only as a highly active laccase-mimicking nanozyme but also as an intrinsic immobilization matrix for lipase, while the Mt support simultaneously prevents nanozyme aggregation and enhances structural stability. This integrated lipase-CMAC@Mt. platform enables efficient substrate channeling, whereby the p-NP intermediate generated from lipase-catalyzed hydrolysis of p-NPP is directly reduced by adjacent CMAC to p-AP, minimizing intermediate accumulation and overcoming diffusion limitations. As a result, the hybrid catalyst achieves efficient one-pot conversion of p-NPP to p-AP, without requiring harsh reagents or intermediate separation. Remarkably, it exhibits exceptional reusability (76.8 % activity retention after 10 cycles) and storage stability (82.4 % activity retained over 30 days), substantially outperforming conventional free enzyme systems. This study demonstrates a strategic bio-nano synergy that combines the specificity of enzymes with the robustness of nanozymes, offering a scalable and economically viable platform for simultaneous toxic waste elimination and resource recovery.
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高影响因子
ANALYTICAL SCIENCES
·
2025
·
IF 2
Xia Shaojie,Yang Zhenyuan,Sun Xiaohui,Huang Junjie,Peng Kuan,Wang Yonghong
Ochratoxin A (OTA), a highly toxic mycotoxin, extensively contaminates a wide range of food commodities. Given increasing demands for sensitive and user-friendly detection platforms, we developed a colorimetric OTA biosensor leveraging copper-silver nanoclusters (Cu/Ag NCs), whose peroxidase-like activity is augmented via G/C-rich DNA hybridization. The system employs two tailored DNA strands: a template strand featuring a cytosine-rich domain for NC synthesis flanked by terminal recognition segments and an enhancer strand containing a guanine-rich signal amplification domain and a complementary linker. Upon OTA binding with the aptamer, the apt-template complex dissociates, facilitating template-enhancer hybridization to form G/C-rich double-stranded DNA. This structural transition substantially enhances the peroxidase-like activity of DNA-Cu/Ag NCs, accelerating the oxidation of 3,3′,5,5′-tetramethylbenzidine by H 2 O 2 while simultaneously amplifying the colorimetric signal. Quantitative OTA detection is accomplished by monitoring this dynamic color response. The biosensor demonstrates a semi-log linear detection range from 5.0 nM to 1.0 μM with a detection limit of 5.0 nM. Furthermore, the specific test has high selectivity for other common mycotoxins, and its applicability has been validated through real sample analysis, suggesting that the DNA-Cu/Ag NCs biosensor used for OTA detection holds promising practical applications in food samples. Graphical abstract
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Xiang Li,Wenjie Zhao,Guosong Wu,Yinghao Wu
The harsh service environment in the splash zone poses serious challenges for the long-term durability of steel pipe piles. The basalt fibers (BF) reinforced-composite coatings have acquired great attention in various fields such as offshore wind power equipment and construction industry due to the high strength and chemical stability. However, the service life of BF reinforced-composite coatings is greatly restricted by poor interfacial compatibility between BFs and polymer resin. In this work, we fabricated a BF reinforced epoxy powder composite coating with excellent erosion resistance by constructing L-Cys@Cu MOF on BFs. The interfacial shear strength value between MBF and EP was 49.66 % larger than that of BF. Contrasted to EP, the adhesion strength between 2.5 %MBF/EP coating and the steel substrate was 79.65 MPa, which was increased by 24.67 %. Interestingly, the mass and volume loss of 2.5 %MBF/EP coating was decreased by 22.77 % and 21.16 %, respectively, compared with 2.5 %CBF/EP coating. These results demonstrate the broader applicability of BF in composite materials, arising from the synergistic effect of mechanical interlocking between MBF and EP and the formation of cross-linking network between L-Cys@Cu MOF and EP. This work provides a novel perspective for the development of BF reinforced-composite coatings with long-term erosion resistance.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 35
·18302-18309
·
IF 11.301
Da Li,Tongtong Liu,Linlin Huang,Jing Wu,Jiannan Li,Liang Zhen,Yujie Feng
The electrochemical conversion of CO2 into fuels and chemicals attracts worldwide attention for tackling global warming and energy crises. However, the efficiencies and selectivities for targeted products such as formate are still far from satisfactory. Herein, core–shell structured Cu2O/Cu@C immobilized on nitrogen-doped graphene sheets (Cu2O/Cu@C/NG) is prepared and used for CO2 reduction. Cu2O/Cu@C/NG yields higher activity towards formate in terms of a lower onset potential (−0.38 V versus RHE) and higher faradaic efficiency (82.1 ± 1.2%), as well as stable performance over 30 h. The enhancements in selectivity and activity are attributed to the synergistic effects between Cu sites and N doping, simultaneously improving CO2 adsorption and the interfacial charge transfer process. Additionally, N doping restrains hydrogen evolution on the copper sites, leaving more available sites for CO2 reduction. This study provides an efficient strategy to increase the activities of electrocatalysts for CO2-to-formate electroreduction.
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