Journal of the Taiwan Institute of Chemical Engineers
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2021
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IF 5.876
Yang Bai,Gongzhe Nie,Yi He,Chao Li,Xianbo Wang,Liqun Ye
Background The Fenton-like reaction is a highly potential advanced oxidation process. The photo-Fenton-like reaction formed by the combination of photocatalytic advanced oxidation process, which combines their advantages, breaks the original Fenton-like reaction rate bottleneck. Methods In this study, an ultra-thin MOF (Cu-TCPP(BA)-MOF) with porphyrin as the ligand and copper as the metal node was synthesized via a simple one-pot method for the first time. Significant Findings It activates Peroxymonosulfate (PMS) under visible light to degrade 10 mg/L Rhodamine B which can be completely degraded within 40 min. The pseudo-first-order rate constant of RhB is 0.9011 min −1 , being 5 folds larger than this for CuO as catalysts. ESR analysis shows that Cu-TCPP(BA)-MOF/PMS/vis system produces a large amount of non-radical 1 O 2 . Also under visible light, with E. coli concentration of 10 7 cfu/mL, it can be completely inactivated within 50 min. Dilution spreading plate method and Fluorescence spectroscopy confirmed the complete death of bacteria. In terms of mechanism, the ultra-thin MOF provides a large number of Cu 2+ active sites. Under visible light, the cycle between Cu 2+ and Cu + is accelerated and the pathways that produce reactive oxygen species (ROS) is changed, thereby improving the performance of contaminant treatment and sterilization.
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Scientific Reports
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2021
·Vol. 11
·期 1
·1-9
·
IF 4.38
Zhang Shujie,Zhang Yating,Fu Lisong,Jing Mengke
The application shell uses cellulose as a green and recyclable fiber material, which has great value in the field of water treatment environment. Varying factors, including pH value, dosage of CS, reaction time and original Cr(VI) ions and Cu(II) ions were studied to investigate the Cr(VI) and Cu(II) ions removal efficiency. The obtained shell trichlorocellulose has better permeability to copper ions, which is mainly due to the different oxide states of copper ions and chromium ions in a pH environment, which lead to different combinations. The price of shell cellulose neutralization is relatively low. Metal ions have better absorption properties. The kinetic and thermodynamic characteristics of the adsorption process of copper ions by chitosan yarns were discussed. The adsorption process of copper ions conformed to the quasi-second-order kinetic equation. It can be fitted by Langmuir isotherm. The adsorption of copper ions by the yarn is a spontaneous thermal reaction with both physical adsorption and chemical adsorption. Compared with chromium ions, chitosan fibers have better adsorption of copper ions, which is mainly because the amino groups in chitosan fibers can have good chelation with copper ions. SEM, FTIR, XRD were used to characterize the adsorption of copper ions by chitosan fibers, and the mechanism of the adsorption of metal ions by chitosan fibers was explored.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
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IF 9.028
Shuhui Sun,Chao Shan,Zhichao Yang,Shu Wang,Bingcai Pan
Phosphonate is an important category of highly soluble organophosphorus in contaminated waters, and its oxidative transformation into phosphate is usually a prerequisite step to achieve the in-depth removal of the total phosphorus. Currently, selective oxidation of phosphonate into phosphate is urgently desired as conventional advanced oxidation processes suffer from severe matrix interferences. Herein, we employed 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) as a model phosphonate and demonstrated its efficient and selective oxidation by the Cu(II)/H2O2 process at alkaline pH. In the presence of trace Cu(II) (0.020 mM), 90.8% of HEDP (0.10 mM) was converted to phosphate by H2O2 in 30 min at pH 9.5, whereas negligible conversion was observed by UV/H2O2 or a Fenton reaction (pH = 3.0). The oxidation of HEDP by Cu(II)/H2O2 was insignificantly affected by natural organic matters (10.0 mg TOC/L) and various anions including chloride, sulfate, and nitrate (10.0 mM). The complexation of Cu(II) with HEDP coupling Cu(III) produced in situ enabled an intramolecular electron transfer process, which features high selective oxidation. Selective degradation of HEDP was further validated by adding stoichiometric H2O2 into an industrial effluent, where the existing Cu(II) could serve as the catalyst. This study also provides a successful case to trigger selective oxidation of trace pollutants of concern upon synergizing with the nature of the contaminated water.
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FUEL
·
2023
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IF 7.4
Yang Shen,Chunjiang Liu,Cunhao Cui,Hairong Ren,Mingming Gu,Haoran Liu,Zhongyue Zhou,Fei Qi
Lignin catalytic pyrolysis presents a promising and sustainable approach to producing aromatic molecules. Herein, we investigated the effect of modified zeolite with copper (Cu/HZSM-5) catalyst on efficiently pyrolyzed kraft lignin into aromatic hydrocarbons (AHs) production, especially mononuclear aromatic hydrocarbons (MAHs). Time-of-flight mass spectrometry (TOF-MS) was employed to compare the volatile product profiles of lignin during catalytic pyrolysis. The highest yield of MAHs reached 70.59 mg/g based on dry lignin at 550 °C, accounting for 70.23% among lignin pyrolysis products, compared to the pristine HZSM-5 zeolite catalytic system with MAHs yield of only 54.31 mg/g and of 40.34% in products. At 550 °C and 60 s residence time, the 5% Cu/HZSM-5 catalyst demonstrated the best performance compared to all other catalysts in terms of selectively producing MAHs. The results are ascribed to the enhancement of decarboxylation and aromatization processes by the doping of copper. This work demonstrates a cost-effective pathway that potentially converts kraft lignin into aromatic hydrocarbon production at a phenomenally high selectivity, providing a concept for industrial application toward biomass utilization and high value-added production.
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CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Yunjiang Yu,Zheng Huang,Dongyang Deng,Yongming Ju,Luyao Ren,Mingdeng Xiang,Liangzhong Li,Hui Li
Tetrabromobisphenol A (TBBPA) was a potential persistent organic pollutants. This study synthesized s-Fe/Cu bimetallic particles by decorated sponge iron (s-Fe) with Copper (Cu) to degrade TBBPA. S-Fe/Cu bimetallic particles was further characterized by XRD, XPS, SEM and EDS. The optimal TBBPA removal efficiency was 95.9%. Among the theoretical Cu mass loading increasing from 0 wt% to 6 wt%, 4 wt% mass loading was the best; with TBBPA initial concentration increased from 5 mg/L to 30 mg/L, TBBPA removal efficiency decreased from 91.2% to 73.0%; also, when dosage increased from 10 g/L to 30 g/L, removal efficiency increased from 58.1% to 95.9%; pH 6.5 were beneficial to degrading TBBPA and the s-Fe/Cu bimetallic particles showed strong catalytic ability after 4 reuse cycle. Kinetic analysis showed that the degradation of TBBPA obeyed pseudo-first-order kinetics. In addition, Liquid Chromatography Time-of-Flight Mass Spectrometry (LC/TOF/MS) detected degradation products including debromination products, hydroxylation products, single aromatic ring products and O -methylating product, which demonstrated that the main degradation pathway were debromination, hydroxyl, β -scission and O -methylation reactions.
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RSC Advances
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2021
·Vol. 11
·期 54
·34355-34368
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IF 3.361
Qiuyue Ding,Wumin Zhang,Yuanyuan Zhu,Lu Wang,Xinyuan Feng,Yanyan Xi,Xufeng Lin
Catalytic Fenton oxidation is an effective way to remove organic pollutants in water, and the performance of the catalyst is a key issue for the competiveness of this method. In this work, various supported bimetallic Pt–Cu catalysts were prepared by different impregnation methods and their performances for catalytic Fenton oxidation of aniline in water were investigated. In the different impregnation methods employed, factors including the reduction method of the metal precursor, type of catalytic support, and loading of metal were investigated. The effect of different reduction methods on actual loadings of the active components on the supported Pt–Cu catalysts showed the order of (i) H2 reduction > (ii) liquid phase methanal reduction. Meanwhile, compared with the monometallic catalysts, the Pt–Cu alloy phase (mainly in the form of PtCu3) was generated and the specific surface area was significantly reduced for the bimetallic catalysts. In the process of Fenton catalytic oxidation of aniline, it was found that most of the prepared catalysts had a certain catalytic activity for H2O2 accompanied with aniline degradation. It was found that Pt0.5Cu1.5/AC (where AC denotes activated carbon) exhibited superb catalytic activity compared with all other prepared catalysts. In particular, aniline was almost completely mineralized in a neutral solution (500 mg L−1 aniline, 0.098 mol L−1 H2O2) after 60 min at 50 °C using Pt–Cu/AC (Pt: 0.5%, Cu: 1.5%). The characterization results showed that the Pt and Cu components were rather evenly distributed on the AC support for this catalyst. More importantly, there was an obvious synergic effect on the supported bimetallic catalyst between the Pt and Cu components for the catalytic oxidation of aniline.
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JOURNAL OF NANOPARTICLE RESEARCH
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2023
·Vol. 25
·期 11
·1-12
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IF 2.5
Li Fangyuan,Yao Niu,Yuan Huiyu,Cui Junyan,Jia Quanli
The redox properties of electrode materials play a vital role in electrochemical performance. Fabrication of electrode materials with multiple oxidation species is highly desired for ultrasensitive glucose sensing. Herein, multivalent Cu/Cu 2 O/CuO/C (Cu/C) nanocomposites were successfully prepared for non-enzymatic glucose sensing by in situ pyrolysis of Cu metal-organic framework (Cu 3 (BTC) 2 ·3H 2 O, Cu-BTC) at a critical temperature. Structure characterizations showed that the nanocomposites maintained the original morphology of Cu-BTC crystals and exhibited mesoporous structures. Meanwhile, multiple Cu species containing Cu, Cu 2 O and CuO were generated simultaneously, which were tightly pinned on the ligand-derived carbon layers. Thus, under the synergistic effect of multivalent Cu species, mesoporous structure and intense interface contact, the sensing platforms based on Cu/C nanocomposites exhibited good glucose detection performance with a wide linear range of 0.005-2.0 mM, ultrasensitivity of 147.65 μA mM -1 cm -2 , low detection limit of 6.31 μM (S/N = 3), and favorable anti-interference properties and stability. Especially, the Cu/C sensing platform showed excellent recoveries of glucose when used to monitor glucose in real sample of honey. The good electrochemical activities of Cu/C nanocomposites render them promising candidates for sensors and other applications. Graphical abstract
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ChemistrySelect
·
2023
·Vol. 8
·期 45
·e202303724
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IF 2.1
Ping Chen,Yu Ling,Hongkai Tong,Ke Dong,Xu Liu,Xiao Chen,Changhai Liang
Graphical 4-Methyl-1-pentene as a branched chain α-olefin can be efficiently synthesized via propylene dimerization on the K−Cu SCALMS catalyst that presents an excellent selective C−C linkage, as well as limits the isomerization of products. The urgent need for branched-chain α-olefin (4-methyl-1-pentene) with excellent characteristics promotes the development of efficient catalysts for the selective dimerization of propylene to it. Based on the concept of supported catalytically active liquid metal solutions (SCALMS), the highly efficient K−M/K 2 CO 3 (M=Fe, Co, Ni, Cu, and Zn) catalysts are prepared by the melting method for the dimerization of propylene. The K−Cu SCALMS catalyst presents highly efficient and excellent selective C−C linkage, as well as limits the isomerization of C6 products. The highest conversion of propylene (64.3 %) with 80.6 % selectivity to 4-methyl-1-pentene with thermodynamic instability is reached at 160 °C, 6 MPa and 20 h. Furthermore, the post-reaction K−Cu SCALMS catalyst can be successfully reactivated in the H 2 atmosphere. Therefore, it is proposed that it may be achieved the continuous selective dimerization of propylene to 4-methyl-1-pentene over K−Cu SCALMS catalyst by the application of fluidized bed technology.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Chuang Li,Li Fu,Suqi Deng,Heng Wang,Li Jia
Environmentally friendly and recycled polydopamine-functionalized electrospun poly(vinyl alcohol)/chitosan nanofibers (PVA/CS/PDA) were prepared through a low-energy-consumption procedure. The PDA coating endows PVA/CS/PDA nanofibers with good water stability. The PVA/CS/PDA nanofibers have a fibrillar and porous structure that is favorable for Cu(II) to access the active sites of the nanofibers. The adsorption isotherm and kinetics data preferably conform to the Liu isotherm and pseudo-second-order kinetic models, respectively. The maximum adsorption capacity of Cu(II) ions by PVA/CS/PDA nanofibers from the Liu isotherm model is 326.5 mg g −1 . The PVA/CS/PDA nanofibers exhibit higher adsorption capacity than some other reported adsorbents. The adsorption mechanism study demonstrates that the Cu(II) adsorption is mainly ascribed to the complexation of Cu(II) with the imino, amino, and hydroxy moieties in PVA/CS/PDA nanofibers. The nanofibers can be employed for 5 cycles without significantly deteriorating performance. More interestingly, a fluorometry method based on the oxidation mimic enzyme activity of Cu(II) was developed to detect low concentrations of Cu(II) using the nanofibers as an adsorbent to preconcentrate Cu(II). The limit of detection is 0.42 mg L −1 . The successful removal and detection of Cu(II) in Pearl River and mineral water samples demonstrates the great potential of PVA/CS/PDA nanofibers to remediate Cu(II)-polluted water.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2023
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IF 5.2
Congli Li,Jiang Wang,Zhenfei Wang,Jinxiang Dong,Qi Shi
CuCl/NaY is the most representative π-complexation adsorbent, prepared by solid thermal dispersion followed by vacuum thermal activation. However, determining the autoreduction behavior of Cu species for CuCl/NaY adsorbent in vacuum thermal activation has rarely been researched. This study characterized the valence state, location, and types of Cu species during thermal dispersion and vacuum activation. During the thermal dispersion, Cu species were uniformly dispersed into NaY micropores. Under vacuum activation at 100 °C, the location of Cu species changed, migrating from supercages to near the plane (toward the sod cage or the supercage side) of the 6-membered ring connecting the supercage and sod cage. However, by activating at 150 °C, vacuum autoreduction occurred: (Cu 2+ –O − )Cl − species evolved into Cu + Cl − species. This was accompanied by the migration of Cu(I) species to the appropriate CO adsorption site on the plane center of the six-membered ring connecting the supercage and sod cage in the NaY framework, which achieved confined dispersion. The CO adsorption capacity of CuCl/NaY activated at 150 °C was 2.75 mmol/g, significantly higher than when activated at 100 °C. When activated at 200 °C, Cu(II) species was further reduced to Cu(I) slightly, which had not migrated to an effective adsorption site. Our results show the Cu species’ evolution and autoreduction behavior for CuCl/NaY adsorbent under vacuum thermal activation, and they can serve as a reference to guide the preparation of π-complex adsorbents.
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Acta Biomaterialia
·
2023
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IF 9.7
Xu Jin,Jie Shan,Jiemin Zhao,Tao Wang,Wei Zhang,Shijie Yang,Haisheng Qian,Liang Cheng,Xu-Lin Chen,Xianwen Wang
Infections and oxidative stress complicate wound healing. In recent years, nanomaterials with natural enzymatic activities have enabled the development of new antibacterial pathways. In this study, Cu-Fe 3 O 4 nanoclusters with multienzyme properties were synthesised. Interestingly, they exhibited activity similar to that of horseradish peroxidase (POD) in acidic environments but their functions resembled superoxide dismutase and catalase in neutral or weakly alkaline environments. In vitro studies have demonstrated the good free-radical scavenging activity of Cu-Fe 3 O 4 nanoclusters in a neutral environment. Under acidic conditions, Cu-Fe 3 O 4 nanoclusters combined with H 2 O 2 demonstrated good antibacterial activity against methicillin-resistant Staphylococcus aureus ( MRSA ) and Escherichia coli ( E. coli ). The combination of Cu-Fe 3 O 4 and H 2 O 2 was found to be effective in preventing MRSA infections and promoting wound healing in animal models. RNA sequencing (RNA-seq) technology revealed that chemodynamic therapy (CDT) using nanoparticles can interfere with metabolic processes such as galactose metabolism in MRSA bacteria, destroy the transport system on the surface of MRSA , and affect quorum sensing to hinder the formation of biofilms, thus achieving effective antibacterial efficacy. The use of Cu-Fe 3 O 4 nanoclusters as a novel class of multi-catalytically active nanozymes in the anti-infection of disease-causing pathogens and wound healing has significant potential. Statement of Significance Cu-Fe 3 O 4 nanoclusters with multienzyme properties were successfully prepared by a solvothermal method. Cu-Fe 3 O 4 nanoclusters exhibited horseradish peroxidase (POD)-like activity in acidic environments and also showed synergistic effects similar to superoxide dismutase peroxidase in neutral or weakly basic environments. More importantly, these Cu-Fe 3 O 4 nanoclusters showed high biosafety with no apparent in vivo toxicity. Chemodynamic therapy (CDT) using Cu-Fe 3 O 4 nanoclusters was revealed by RNA sequencing (RNA-Seq) technology to interfere with the metabolic processes of MRSA bacteria, such as galactose metabolism, disrupt the MRSA surface transport system, and impede biofilm formation, resulting in effective antibacterial efficacy. The use of Cu-Fe 3 O 4 nanoclusters for anti-infection and wound healing of pathogenic pathogens has significant potential as a novel class of multi-catalytic active nanoclusters.
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MOLECULES
·
2023
·Vol. 28
·期 20
·7232
·
IF 4.6
Ruichun Nan,Shurui Liu,Mengwan Zhai,Mengzhen Zhu,Xiaodong Sun,Yisong Chen,Qiangqiang Pang,Jingtao Zhang
In this study, Cu-doped ZnO was prepared via the facile one-pot solvothermal approach. The structure and composition of the synthesized samples were characterized by XRD (X-ray diffraction), TEM (transmission electron microscopy), and XPS (X-ray photoelectron spectroscopy) analyses, revealing that the synthesized samples consisted of Cu-doped ZnO nanoparticles. Ultraviolet–visible (UV-vis) spectroscopy analysis showed that Cu-doping significantly improves the visible light absorption properties of ZnO. The photocatalytic capacity of the synthesized samples was tested via the disinfection ofEscherichia coli, with the Cu-ZnO presenting enhanced disinfection compared to pure ZnO. Of the synthesized materials, 7% Cu-ZnO exhibited the best photocatalytic performance, for which the size was ~9 nm. The photocurrent density of the 7% Cu-ZnO samples was also significantly higher than that of pure ZnO. The antifungal activity for 7% Cu-ZnO was also tested on the pathogenic fungi ofFusarium graminearum. The macroconidia ofF. graminearumwas treated with 7% Cu-ZnO photocatalyst for 5 h, resulting in a three order of magnitude reduction at a concentration of 105CFU/mL. Fluorescence staining tests were used to verify the survival of macroconidia before and after photocatalytic treatment. ICP-MS was used to confirm that Cu-ZnO met national standards for cu ion precipitation, indicating that Cu-ZnO are environmentally friendly materials.Keywords:Cu-doping;nanoparticles;semiconductors;antifungal activity;safety assessment;Zinc oxide
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