NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 38
·18251-18261
·
IF 3.925
Jiabao Sun,Qiang Li,Dajie Zhang,Dongsheng Xia
Oxytetracycline (OTC) is a typical antibiotic that poses a serious threat to the environment. However, traditional treatment methods suffer from low treatment efficiencies and potential secondary contamination. Therefore, there is a need to develop efficient, convenient, and environmentally friendly removal technology. In this paper, magnetic nano-Cu/Fe composites were successfully synthesized and used as the activator of peroxymonosulfate (PMS) to degrade OTC. The obtained catalysts with different ratios showed excellent degradation effects, especially the Cu/Fe-1 catalysts. The highest removal efficiency of OTC (93%) was achieved with 0.2 g L−1 PMS and 0.1 g L−1 catalyst in 60 min. The impacts of the catalyst and PMS dosages, initial temperature and pH, coexisting anions, microplastics, and real-life water samples were investigated. To explore the mechanism for OTC degradation, radical scavenging and electron spin resonance (EPR) experiments were carried out, and non-radical 1O2 was identified to be the main radical. TEM and XRD results show the presence of CuFe2O4 composites in Cu/Fe-1, which can promote the production of 1O2 and thus improve the OTC degradation efficiency. This work provides a new efficient, stable, low-cost, and environmentally friendly approach for the degradation of oxytetracycline.
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RSC Advances
·
2022
·Vol. 12
·期 51
·32898-32902
·
IF 4.036
Fanwei Meng,Guofang Ma,Jiahe Qiu,Zhendong Fu,Jiaqing Yan,Lingping Wang
Nanozyme is a material with enzyme-like catalytic activity, which has been widely used in environmental, antibacterial, and other fields of research. However, there are few reports on the toxicity of nanozymes. In this work, nanozymes co-assembled from sodium N-lauroyl sarcosinate (Ls) and Cu ions possess a Cu(I)–Cu(II) electron transfer system similar to that of natural laccases. Reaction kinetic studies show that the catalyst follows a typical Michaelis–Menten model. Cu–N-lauroyl sarcosinate nanozyme (Cu-Ls NZ) possess excellent laccase-like activity to oxidize a variety of phenol-containing substrates, such as phenol, 4-iodophenol, and 2,4,5-trichlorophenol. To evaluate the toxicity of the material, the nematode C. elegans was exposed to various concentrations of Cu-Ls NZ. Effects on physiological levels were determined. The results showed that high doses of Cu-Ls NZ increased the amount of reactive oxygen species (ROS), decreased the locomotor activity of nematodes, and inhibited their larval growth.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Gangfeng Li,Shaobiao Feng,Lili Yan,Lijuan Yang,Bei Huo,Liuliu Wang,Sheng Luo,Dexin Yang
Due to a small amount of Cu (Ⅱ) ions being beneficial and too much being harmful, it is necessary to establish a rapid and direct detection method. Herein, we reported a platform based on multiwalled carbon nanotubes (MWCNTs), 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6), and Nafion solution-modified glassy carbon electrode (GCE) for the direct electrochemical detection of Cu (II) ions. We used differential pulse anodic stripping voltammetry, including the electrodeposition of Cu (Ⅱ) ions on the modified GCE and subsequent anodic stripping. Under the optimum conditions, the linear range was 20 μg·L −1 ∼ 950 μg·L −1 , the limit of detection (LOD) was 16 μg·L −1 , and the limit of quantification (LOQ) was 54 μg·L −1 for Cu (II). We realized the quantitative detection of Cu (Ⅱ) ions in juice and tea beverage without tedious pretreatment. The result showed that the sensor had good anti-interference and practicability for actual food samples.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2022
·Vol. 36
·期 10
·e6833
·
IF 4.072
Jing Hu,Yun Luo,Min Hou,Jia Jia Qi,Li Li Liang,Wen Ge Li
Two dinuclear complexes [Cu 2 (LO) 2 ] and [Ni 2 L 2 Cl 2 (C 2 H 5 OH) 2 ] derived from (5-chlorosalicylaldehyde)-4-aminoantipyrine (HL) were synthesized and characterized by infrared (IR) spectroscopy，thermogravimetric analysis, and powder X-ray diffraction. Molecular structures of the Cu (II) and Ni (II) complexes were determined by single-crystal X-ray diffraction. Their cytotoxicity was evaluated by methyl thiazolyl tetrazolium assay against human tumor cells, such as lung carcinoma A549, lung adenocarcinoma H1975, breast carcinoma MDA-MB-231, and nasopharyngeal carcinoma CNE-2Z cell lines. The results showed that the Cu (II) complex had much better anticancer activity than the Ni (II) complex, especially for MDA-MB-231 and CNE-2Z cells. The reason may be that they have different structures. The methyl group on the (5-chlorosalicylaldehyde)-4-aminoantipyrine (HL) was oxidized to the hydroxymethyl group, herein, namely LO, which is difficult to achieve in the normal chemical synthesis process. However, we did it by a solvothermal method at low temperature. It provides a new way of thinking and synthesis. The anticancer activity of the copper complex was next only to cisplatin, and the copper complex was nontoxic for the human normal cell lines. The experiment results also showed that the copper complex could inhibit tumor cell proliferation through the cell cycle and cell apoptosis.
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Analytical Methods
·
2022
·Vol. 14
·期 33
·3153-3159
·
IF 3.532
Ling Mei,Tiantian Si,Shuai Wang,Jie Zhu,Hao Tang,Xiaojing Liang
The TiO2@MOF-919(Fe–Cu) solid-phase extraction material was prepared by growing MOF-919(Fe–Cu) in situ on three-dimensional radial TiO2 microspheres by a simple solvothermal method. This combination drew on both the resources of good single dispersion and extraction rate, which made it a better extraction material. It was accompanied with high-performance liquid chromatography (SPE–HPLC) for the separation and determination of four benzoylurea pesticides (triflumuron, chlorbenzuron, teflubenzuron and diflubenzuron) in afforestation irrigation water and juice samples (grape, peach and apple juices). Under the optimal conditions, the linearity of the method ranged from 1 to 400 μg L−1 with a correlation coefficient (R2) ≥ 0.9994, while the detection limit was in the range of 0.40–0.56 μg L−1 for the four pesticides. The adopted material showed good reusability and can be used no less than 10 times. The intra-day and inter-day precision were in the range of 1.78–3.24% and 4.06–5.08%, respectively. The proposed method was then successfully applied for the detection of benzoylurea pesticides in the spiked samples with good recoveries (72.3–108.4%) and good precision (5.15%) due to π–π and hydrophobic interactions between the analytes and adsorbent. The results show that the composite had the potential to be used as a SPE adsorbent for the enrichment and extraction of benzene ring structures containing imide groups in actual samples.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Yuqing Pan,Na Li,Shiyuan Ran,Du Wen,Qinlan Luo,Ke Li,Qulan Zhou
Efforts have been devoted to exploring the effective composite catalysts for low-temperature selective catalytic reduction of NOx by CO (CO-SCR) using Fe-Cu bimetal oxide (Fe2Cu1) as the active component and rice husk ash (RHA), amorphous SiO2, and activated carbon (AC) as supports. The results showed that the beneficial role of RHA as a catalyst support for CO-SCR was primarily reliant on amorphous SiO2 in RHA and not on AC. Both Fe2Cu1/RHA and Fe2Cu1/amorphous SiO2 catalysts exhibited the best catalytic performance of CO-SCR, which had good stability, wide active temperature range, high conversion ratio, 100% N2 selectivity, and superior resistance to O2, SO2, and H2O (g). The CO and NOx conversion ratios of Fe2Cu1/amorphous SiO2 could reach up to approximately 100% from 100 to 500 °C. The excellent SCR performance was associated with the large specific surface area and good structural stability of amorphous SiO2, the uniform distribution of active sites, dual redox cycle of Fe2O3 and CuO species, and many surface-adsorbed oxygen species, which made amorphous SiO2-based catalysts highly competitive for application in the SCR process. This research provides the underlying insights for the improvement of industrial application to realize ″non-ammonia SCR″ technology with near-zero NOx/CO emissions synergistically at low temperatures.
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Molecular Catalysis
·
2022
·
IF 5.089
Pan Pan,Mingming Li,Yuxin Liu,Yisi Feng,Xinglong Li
2,5-diformylfuran (DFF) is a multifunctional intermediate, which can be used in drugs, functional polymers, fluorescent materials and surfactants. In this paper, a TEMPO-assisted magnetic Fe 3 O 4 @SiO 2 @mSiO 2 -NH 2 -Cu(II) catalytic system was developed for the selective oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran. The structure of Fe 3 O 4 @SiO 2 @mSiO 2 -NH 2 -Cu(II) was double-layer shell-core spherical structure with uniform ordered mesoporous on the surface, amino groups and Cu were evenly distributed in the outer mesoporous. The catalyst was characterized by FT-IR, TEM, EDS, SEM, XRD, BET and VSM. The effects of reaction conditions were investigated in detail. The conversion of HMF was 98.9% and the highest DFF yield was 92.4% under atmospheric oxygen in toluene solvent. The catalytic activity did not decrease significantly after 5 cycles. The catalytic system had good substrate adaptability for benzyl alcohols and aromatic alcohols with satisfactory yield of corresponding aldehydes (91.3–100%). A possible reaction mechanism was also proposed and found that bis(μ-hydroxy) double copper (II) may be the active reactant in oxidation reaction. The system provides a promising industrialized preparation method for DFF.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Xiao Chen,Wenqi Liu,Jingjie Luo,Hongyu Niu,Rongrong Li,Changhai Liang
The hydrogenation of furfural containing multifunctional group often needs the high-efficiency cooperation of multiple catalytic active centers, which is greatly determined by the regulation of the surface and interface structure of multicomponent catalytic materials. Based on such circumstance, a series of highly dispersed supported bimetallic Cu–Ni catalysts prepared by the in situ topological transformation of layered double hydroxides have been investigated for the one-pot hydrogenation of furfural. Compared with the supported monometallic Cu and Ni catalysts, the optimized bimetallic Cu1Ni3/MgAlO catalyst presents highly efficient and good selectivity in the hydrogenation of furfural at the bath reactor. The selectivity to tetrahydrofurfuryl alcohol reaches 94.0% with a complete conversion of furfural at 110 °C under 3 MPa of H2 for 3 h. The results of TEM and in situ FT-IR confirm that the Ni-rich Cu–Ni alloy in the Cu1Ni3/MgAlO catalyst generates a strong synergistic effect, which shifts the adsorption configuration of furfural from parallel or vertical adsorption to tilted adsorption so as to significantly improve the catalytic performance. The intrinsic catalytic performances of CuxNiy/MgAlO catalysts indicate that the TOFC═O and TOFC═C values can be balanced through construction of the structure of the catalyst for achieving the synergistic effect between Cu and Ni significantly to enhance the one-pot selective hydrogenation of furfural to tetrahydrofurfuryl alcohol. Additionally, the Cu1Ni3/MgAlO catalyst presents excellent reusability by six-cycle testing. The above results indicate that the Cu1Ni3/MgAlO with the cooperation of multiple catalytic active centers is a promising catalyst for the selective hydrogenation of furfural.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 29
·13931-13939
·
IF 3.925
Nan Sun,Yuhan Jing,Yong Zhang,Xinru Li,Yaoning Bai,Yuwei Yan,Taoyuan Ouyang,Honglin Tan,Xiaoming Cai,Jinming Cai
Copper-based photocatalysts have attracted much attention because of their great prospects in photochemical conversion. However, the preparation of highly stable copper-based photocatalysts is a challenge. In this study, copper nanoparticles (Cu NPs) wrapped in graphitized polyacrylonitrile (g-PAN) were prepared by a two-step sintering method. Even if Cu@g-PAN is placed in the air for one month, the Cu NPs were still not oxidized. Furthermore, we succeeded in further introducing graphitized carbon nitride (g-C3N4) into the g-PAN shell structure, which was confirmed using a Scanning Transmission Electron Microscope (STEM), FT-IR, and UV-Vis absorption spectra. Cu@g-PAN/g-C3N4 can degrade 88.61% of methylene blue (MB) in one hour, showing a higher catalytic activity than Ag@g-PAN/g-C3N4 (55.18%). XPS and Auger electron spectroscopy tests of catalyzed Cu@g-PAN/g-C3N4 show that Cu is not oxidized. We have proposed a possible mechanism for charge separation and transformation in the Cu@g-PAN/g-C3N4 composites to explain the enhanced photocatalytic performance. This work provides a new method to protect Cu NPs and demonstrates the prospect of rational design of copper-based photocatalysts with high stability and efficiency.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Ruolan Zhou,Xiaohong Zhuang,Qiaoli Wu,Ming Jin,Chaochuan Zheng,Yayun Jiang,Yongliang Lou,Laibao Zheng
As an alternative to natural enzymes , artificial enzymes based on nanomaterials have attracted a lot of attention owing to their outstanding catalytic activity and high stability as well as low cost. Cu-MOF loaded with platinum nanoparticles (labeled Cu-MOF@Pt) was prepared by simple one-step wrapping method using platinum nanoparticles, copper nitrate trihydrate and 1,3,5-tricarboxybenzene. It was confirmed that Cu-MOF@Pt exhibits peroxidase-like activity, which can quickly catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) and produce blue oxidized TMB (oxTMB) in the presence of hydrogen peroxide (H 2 O 2 ). Additionally, steady-state kinetics showed that Cu-MOF@Pt exhibits stronger appetency to TMB and H 2 O 2 compared with horseradish peroxidase . Thanks to the peroxidase-like activity of Cu-MOF@Pt, a highly selective colorimetric method for glucose detection has been successfully established, the linear range is 2–15 mM (R 2 =0.9999) and the Limit of Detection (LOD) is 0.42 mM, with a detection range that meets clinical needs. Moreover, its good intra- and inter-assay precision and excellent stability make the results of glucose detection very reproducible. The detection performance of 90.09% was still maintained at 4 ℃ for 2 months. In conclusion, a new nanocomposite was successfully prepared and its selective detection ability for glucose was proved, which established a good basis for the clinical development of new enzymes for biosensors .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Liuting Mo,Shifeng Zhang,Fei Qi,Anmin Huang
Water pollution by heavy metal ions is a global concern due to detrimental effects on the ecological environment and human health. To solve the problem of the stability and recyclability of the traditional adsorbents, we proposed three-dimensional lamellar porous cellulose nanofiber/polyacrylamide composite aerogel with outstanding pollutants adsorption, easy regeneration, and multiple recycling. The aerogel adsorbent was prepared by a two-step method via facile in-situ physical/chemical double cross-linking and freeze-drying processes. The resulting aerogels showed good thermal stability , superior water stability and excellent adsorption properties, with a maximum Langmuir adsorption capacity for Cu(II) ions up to 240 mg g −1 due to the in-situ physical/chemical combination of anionic polyacrylamide and carbonylated cellulose nanofibers. The adsorption mechanism was the electrostatic attraction, chelating effect and complex formation driving forces for the fast and efficient adsorption of Cu(II) ions. The removal efficiency of the aerogels for Cu(II) remained above 80% after 10 adsorption/regeneration cycles, suggesting its outstanding recyclability. The proposed aerogel adsorbent shows noteworthy potential for the practical treatment of heavy metal ion wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hui Zhao,Yinsen Huang,Yichen Han,Jin Yun,Xinlong Wang,Liang Jin,Yaping Zheng,Lixin Chen
Lightweight porous conductive polymer composite materials (CPCs) are up-and-coming electromagnetic interference (EMI) shielding materials. However, fair-sized thickness (>1 mm) and limited thermal conductivity hinder their application in modern integrated and miniaturized electronics. Herein, flexible bidirectional differential porous carbon fillers (C-fillers)/polyether sulfone (PES)/Cu (PCPES/Cu) composite films are fabricated via phase inversion technology followed by magnetron sputtering process. The bidirectional differential structure features with a top porous C-fillers/PES (PCPES) film and a bottom sputtering highly-conductive Cu thin layer. The PCPES film possesses hierarchical pore structure that is derived from mass transfer between solvent and nonsolvent. Owing to the bidirectional differential structure, an “absorption-reflection-reabsorption” shielding process is created to strengthen EMI shielding performance and relieve secondary microwave reflection in PCPES/Cu composite film. Its shielding effectiveness is as high as 59.7 dB, and specific SE/t is up to 6982.5 dB cm 2 g −1 . Notably, the reflection coefficient falls to 0.73, below other shielding materials with similar thickness. Further, the Cu thin layer can construct effective transmission channel of phonons in the plane direction, allowing thermal conductivity enhancement. The flexible lightweight EMI shielding composite films with satisfied thermal conductivity have extensive application prospects, such as aerospace, wearable electronics, and portable electronics.
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