CONSTRUCTION AND BUILDING MATERIALS
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2024
·
IF 7.4
Lin Wang,Hongqiang Chu,Jiaxuan Xie,Mingzhi Guo,Linhua Jiang,Xiang Xi,Yi Fang,Wei Zhao
Concrete corrosion in wastewater pipelines is caused by biogenic sulfuric acid produced locally by sulfur-oxidizing microorganisms. Concrete mixtures are commonly modified to prevent this form of corrosion by adding biocides to inhibit their biological activities. However, using biocides is not always desirable because of their limited lifespan and potential for leaching into the environment. Therefore, there is a need to develop more durable alternatives to prevent microbial-induced corrosion of concrete. In this study, three types of Cu-Ti amorphous alloys (Cu 35 Ti 65 , Cu 50 Ti 50, and Cu 65 Ti 35 ) were prepared by ball milling, and compared with commercially available TiO 2 nanoparticles to assess their effects on the resistance of the microbial-induced corrosion performance of mortar. Detailed investigations were conducted on the appearance, mechanical properties, and corrosion depth of mortars at various exposure durations in an accelerated biocorrosion environment. The results revealed that the mortars mixed with Cu 35 Ti 65 , Cu 50 Ti 50 , Cu 65 Ti 35 , and TiO 2 nanoparticles exhibited significantly better resistance to microbial-induced corrosion than the reference mortars. The resistance to microbial-induced corrosion of the mortar mixed with Cu 50 Ti 50 was the best. The superior antimicrobial corrosion performance of the mortar containing Cu-Ti amorphous alloy is influenced by both smaller particle sizes and higher sterilization performance. These findings can contribute to the development of novel applications of amorphous alloys in functional concrete.
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RSC Advances
·
2024
·Vol. 14
·期 7
·4861-4870
·
IF 3.9
Yibo Zhao,Yueyang Li,Lu Chang,Wenjing He,Keling Liu,Minjie Cui,Shengnan Wang,Yujia Zhao,Xinyu Tan
Bimetal doped Cu–Fe-zeolitic imidazole framework-8 (ZIF-8)/graphitic carbon nitride (GCN) (Cu–Fe-ZIF-8/GCN) nanocomposites were prepared via one-pot and ion-exchange methods. The main influencing factors, such as adsorbent concentration, TC concentration, initial pH, and coexisting ions, were evaluated in detail. Due to the suitable pore structures and the presence of multiple interactions on the surface, the nanocomposite showed a high adsorption capacity up to 932 mg g−1 for tetracycline hydrochloride (TC), outperforming ZIF-8 by 4.8 times. The adsorption kinetics and adsorption isotherm were depicted in good detail using pseudo-second-order kinetic and Langmuir models, respectively. Thermodynamic calculation revealed that the adsorption of the nanocomposite under experimental conditions was a spontaneous heat absorption process, and was primarily driven by chemisorption. After four cycles of use, the nanocomposite retained 87.2% of its initial adsorption capacity, confirming its high reusability and broad application prospects in removing tetracycline-type pollutants from wastewater.
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PubMed
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2024
·Vol. 42
·期 24
·3201-3210
·
IF 5.5
Zhou Zhong,Xiang-Ji Liu,Li Ma,Zi-Jian Zhan,Yu-Xin Yuan,Heng-Jian Zhang,Feng-Ying Cai,Yi-Dong Hou,Jian Lü,Rong Cao
Comprehensive Summary Electron transfer is an important way to activate persulfate. Currently, the electrons for persulfate activation mainly originate from organic contaminants or the catalyst itself, which can lead to selective activation of persulfate or oxidation of the catalyst, respectively, and thus become a bottleneck restricting its application. In this work, Cu−doped FeVO 4 (Cu−FVO) was prepared, and the results showed that Cu doping can significantly improve the photocatalytic activity and stability of FVO for peroxymonosulfate (PMS) activation. The optimized Cu−FVO/PMS/light system exhibited a high BPA degradation rate that is 4.3 times higher than that of the FVO/PMS/light. This system manifested a broad applicability to various organic contaminants even with complex matrix. Photoelectrochemical analysis and DFT theoretical calculations revealed that Cu doping boosted the photogenerated charge separation and the adsorption of PMS on FVO. Furthermore, Cu doping led to the establishment of an electron transfer channel from Cu−FVO to PMS, through which photogenerated electrons achieved an efficient PMS activation. Meanwhile, holes were consumed by organic contaminants to avoid the oxidation of catalyst. These collectively enhanced the photocatalytic activity and stability of Cu−FVO, which also maintained high catalytic activity even after 20 cycling degradation reactions.
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BULLETIN OF MATERIALS SCIENCE
·
2025
·Vol. 48
·期 1
·1-9
·
IF 2.1
Qi Wenqian,Deng Bo,Mao Hui
Despite the low levels of copper ions in aquatic environments, excessive concentrations of copper ions can eventually cause serious harm to animals and humans as they are biologically enriched and ecologically cycled. Herein, an appropriate and selective separating material for copper ions with low concentrations needs to be developed. In the present work, bayberry tannin-modified chitosan fibres (TMF) were fabricated for selective removal of Cu 2+ . The adjacent phenolic hydroxyl groups at the B ring of tannin enable them to chelate with heavy metal ions, while the fibre structure of chitosan is conducive to the extended distribution of the active sites. It showed an adsorption capacity of 14.98 mg g –1 for Cu 2+ at 303 K, which was higher than that of most conventional adsorbents and activated carbon. Moreover, in the presence of co-existing heavy metal ions, including Ni 2+ , Cd 2+ , Fe 3+ and Cr 3+ , we found that TMF showed highly selective adsorption of Cu 2+ , with Cu 2+ concentrations as low as 5 mg l –1 . The TMF can be robustly recycled through acid treatment with 96.6% desorption efficiency.
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JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 18
·9117-9122
·
IF 5.968
Sha Chen,Hongye Zhang,Lingyan Wu,Yanfei Zhao,Changliang Huang,Maofa Ge,Zhimin Liu
Based on the galvanic replacement reaction between Cu nanoparticles and noble metal ions, a simple and efficient strategy was developed for the preparation of supported Cu–M (M = Pt, Pd, Ru, Rh) bimetallic nanoparticles under intense ultrasonication irradiation at ambient environment. A series of Cu–M/TiO2 bimetal catalysts with controllable composition, metal particle size less than 2 nm and narrow size distribution were obtained, and characterized by transmission electron microscopy (TEM), high resolution transmission electron microscope (HRTEM) with scanning TEM (STEM) mode, energy-dispersive X-ray spectrometers (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and ICP-AES analysis. It was demonstrated that most of the metal particles were present in the form of bimetallic state. The mechanism of this strategy was discussed. The resultant Cu–Pd/TiO2 was used to reduce nitrate at room temperature, and it exhibited extremely high activity.
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Haolin Sun,Xiaoyu Zhang,Hainan Ma,Lina Zhang,Yang Zhang,Ruimeng Sun,Haoran Zheng,Han Wang,Jiayu Guo,Yanqi Liu,Yurou wang,Yanfei Qi
Rapid and sensitive detection of pathogenic bacteria is crucial for disease prevention and control. The CRISPR/Cas12a system with the DNA cleavage capability holds promise in pathogenic bacteria diagnosis. However, the sensitivity of CRISPR-based assays remains a challenge. Herein, we report a versatile and sensitive pathogen sensing platform (HTCas12a) based on the CRISPR/Cas12a system, hybridization chain reaction (HCR) and Poly T-copper fluorescence nanoprobe . The sensitivity is improved by HCR and the Poly-T-Cu reporter probe reduces the overall experiment cost to less than one dollar per sample. Our results demonstrate the specific recognition of target nucleic acid fragments from other pathogens. Furthermore, a good linear correlation between fluorescence intensity and target quantities were achieved with detection limits of 23.36 fM for Target DNA and 4.17 CFU/mL for S.aureus , respectively. The HTCas12a system offers a universal platform for pathogen detection in various fields, including environmental monitoring, clinical diagnosis, and food safety.
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PubMed
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 36
·e55918
·
IF 2.7
Juan Chai,Yaxin Hou,Yanhui Zhang,Yan Xia,Shiya Ran,Shengyan Wang,Nianfu Chen,Zhenghong Guo,Juan Li,Zhengping Fang
Inspired by the significant catalytic charring effect of metal–organic frameworks (MOFs), Cu-MOF decorated ammonium polyphosphate (APP@Cu-MOF) was prepared by coupling agents to improve the fire safety of epoxy resin (EP). After adding 9 wt% APP@Cu-MOF, the fire performance of EP is significantly improved with limiting oxide index (LOI) value of 29.4 and UL-94 V-0 rating. The peak heat release rate (PHRR), total smoke production (TSP), CO production, and CO 2 production of EP composite samples decreased by 34.6%, 54.7%, 24.6% and 30.0%, respectively. It is proposed that the synergistic effect among Cu-MOF and APP promoted the char formation of EP. The dense carbon layers formed a barrier that prevented the transfer of heat and inhibited the release of toxic gases, thus acting as a flame retardant. This work provides a new strategy to develop a high-efficient MOF-decorated flame retardant with smoke inhibition, toxicity reduction, and catalytic carbonization effect.
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Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Fangfang Chang,Zihan Lin,Yongpeng Liu,Qing Zhang,Xiaolei Wang,Zhengyu Bai
The ability to adjust the composition and surface structure of Cu-based nanomaterials is important for designing catalysts to effectively convert CO2 into multi-carbon products via electrocatalytic reduction. Herein we report a potential-driven in situ forming Cu/Cu2O catalyst featuring interface and tensile strain characteristics from the partial reduction of Cu2O nanocubes for electrocatalytic enhancement of the electrochemical CO2 reduction reaction (CO2RR). The results revealed interesting catalytic relationships between Cu+–Cu0 compositions and tensile strain, exhibiting maximum faradaic efficiencies for C2 products in the H-type cell at a Cu0 : Cu+ ratio of ∼46 : 54. As revealed by operando X-ray diffraction analysis, Cu/Cu2O in this ratio exhibits a clear tensile strain in Cu during the CO2RR. The outstanding performance of this composition is attributed to the tensile strain and interface of the surface, in addition to the composition synergy due to the Cu0 sites decorating the surface in an electron-rich state and being conducive to CO2 adsorption and activation and the Cu+ sites enhancing the carbon–carbon coupling to adsorbed *CO, which were also supported by density functional theory (DFT) calculations and in situ ATR-FTIR. The findings open up a new pathway for the rational design of Cu-based catalysts with enhanced activity and selectivity to boost the CO2RR.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yeshuang Wang,Mingxian Duan,Zhelin Su,Chao Yang,Yuxiao Wang,Tian Kou,Jiawei Kou,Huiling Fan
Cu–1,3,5-benzenetricarboxylate (Cu–BTC) exhibited potential for hydrogen sulfide (H 2 S) removal, however, its sulfur capacity is limited due to it relies only on the adsorption reaction path. Herein, a series of Fe-doped Cu–BTC materials (denoted as x Fe–Cu–BTC) were synthesized to enhance H 2 S removal capacity via a adsorption–oxidation bifunctional synergism mechanism. The prepared materials were characterized using various techniques, and their H 2 S removal performance was measured under dry and ambient conditions. The experimental results demonstrated that the 18%Fe–Cu–BTC shown the optimal breakthrough sulfur capacity of 122.8 mg S/g, marking a 2.1-fold and 10.3-fold improvement over pure Cu–BTC and Fe–BTC, respectively. The characterization analyses revealed that the Cu 2+ active sites initially react with H 2 S to form CuS, while the incorporated Fe 3+ sites trigger the oxidation of CuS, yielding elemental sulfur, Cu 2+ and Fe 2+ . The resultant Cu 2+ and Fe 2+ further engage in reactions with H 2 S to form CuS and FeS, thereby enhancing the H 2 S removal capacity via dual reaction pathways of adsorption and oxidation. Additionally, appropriate Fe doping increased the specific surface area and pore volume of Cu–BTC, which exposed more active sites and improved molecular diffusion. Based on the obtained findings, a plausible desulfurization mechanism involving adsorption and oxidation synergism for remove H 2 S was proposed.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Ao Ding,Yupeng He,Fei-Fei Chen,Yan Yu
Bacterial infections result in significant burdens on public health, especially with the increasing prevalence of antibiotic resistance owing to the overuse of antibiotics. The development of the next-generation nanoantibacterial materials as alternatives to antibiotics is urgently needed. Metal–organic frameworks (MOFs) have been emerging as promising antibacterial materials. However, the impact of metal centers on the properties and antibacterial activity of MOFs has not been clarified to date. In this work, five M-MOF nanomaterials (M = Fe, Co, Ni, Cu, Zn) are synthesized with 2-methylimidazole as an organic ligand. Subsequently, the minimum inhibitory concentration (MIC), minimum bactericidal concentration, and time-kill curves are studied to evaluate their antibacterial activity. In addition, the destruction of the bacterial cells after treatment with M-MOFs is observed via scanning electron microscopy. The experimental results demonstrate that the Co-MOF and Zn-MOF polyhedra exhibit optimal antibacterial activity. They can effectively inhibit the growth of both Gram-negative bacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus at a low concentration. On the other hand, the Fe-MOF irregular particles show the weakest antibacterial activity among five M-MOFs and the antibacterial activity of the Ni-MOF and Cu-MOF nanosheets are comparable to each other. The huge difference in antibacterial activity of M-MOFs is attributed to the difference in the shape and size, specific surface area, surface charge, ion release, and production of reactive oxygen species. Overall, this study clarifies the relationship between metal centers in M-MOFs and their antibacterial activity.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Dingkun Yang,Yu Lei,Zhou Fan,Weigen Chen,Fu Wan
Surface-enhanced Raman scattering (SERS), functioning as a highly sensitive trace detection tool, has gained popularity as an analytical technique and is extensively employed in diverse domains such as electrical engineering. In this paper, the exploration is conducted regarding the application of surface-enhancement technology in the quantitative detection of the aging characteristics of transformer oil-paper insulation. Flower-like silver nanoparticles (AgNPs) were deposited in situ on a copper foil coated with porous graphene, thereby fabricating a Cu-graphene (porous)-AgNPs surface-enhanced substrate. This substrate effectively prevented the oxidation of nanoparticles while maintaining the SERS activity. By creating apertures in graphene, the adsorption capability of the substrate for organic small molecules like furfural was enhanced, and the size of silver nanoparticles was optimized to achieve better detection outcomes. The performance of the substrate was evaluated using R6G as the probe molecule, and the findings indicated that the substrate exhibited excellent sensitivity, uniformity (RSD values are below 10 %), and antioxidant properties (after 30 days, the peak strength decreased by 8.23 %). When this substrate was utilized for the detection of transformer aging characteristics, the detection limits for furfural, acetone, and methanol reached 0.04 mg/L, 0.18 mg/L, and 0.18 mg/L respectively, fulfilling the analytical requirements of oil-immersed transformers. This research holds significant importance in guaranteeing the stable operation of the power supply system and the smooth development of the national economy.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jiyun Zheng,Guogang Shu,Wei Wang,Qiulin Li,Wei Liu
Surface quality improvement by Cu activation and oxidation roughening process was studied during electroless coating Cu on boron carbide (B 4 C) particles. The surface morphology was characterized by scanning electron microscope (SEM) and the phase identification was determined by X-ray diffraction (XRD) analysis. Two aspects concluding surface activation and surface roughening were investigated to understand the effect of each on Cu coating. Cu activation process increased surface activity of B 4 C by pre-deposition Cu nano-crystals, which was effective and cost-saving when compared with conventional Pd activation method. The influence of activation pH on electroless Cu coating was discussed and a moderate pH 12 is suitable for Cu deposition. Surface roughening process availably promoted wettability of B 4 C particles with aqueous solution. Etched pits were formed on B 4 C surface and resulted in fresh surface exposed after oxidization roughening process, which was beneficial for Cu bonding and coating on B 4 C surface.
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