JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Tiecheng Wang,Liling Zhou,Yang Cao,Ying Zhang,Guangzhou Qu,Xuetao Guo,Hanzhong Jia,Lingyan Zhu
Heavy metals and natural organic matters (NOM) form very stable heavy metal-NOM complexes in aqueous, facilitating the migration of heavy metals and enhancing their potential risks. In this study, non-thermal plasma oxidation was attempted to destroy the heavy metal-NOM complexes, with Cu-humate (Cu-HA) as a model. The decomplexation efficiency reached 86.1 % within 50 min of plasma oxidation at 16 kV. The generated reactive species by the non-thermal plasma, including O 2 − , 1 O 2 , OH, attacked the carboxyl and hydroxyl functional groups of HA, leading to cleavage of the Cu-O bonds, decomplexation of Cu-HA, and release of free Cu(II). Meanwhile, a variety of small molecular intermediates, including phenols, benzoic acids, esters, amines, ketones, acetic acid, formic acid, and oxalic acid, were generated due to attack by the oxidative species on the aromatic moiety and double bonds in Cu-HA. As a consequence of decomplexation, the residual toxicity of Cu-HA to Scenedesmus obliquus was distinctly reduced. This study provides a potential technique to decomplex heavy metal-NOM complexes, and reduces their toxicity to typical Scenedesmus obliquus.
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CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Yongjian Xu,Yun Shi,Feng Lei,Lei Dai
Cellulose-based materials are widely used in the biomedical field. However, the lack of antibacterial activities of cellulose fibers inevitably causes bacterial infection damages. In this study, Schiff base was first introduced to endow the cellulose fibers good antibacterial property and copper ions were complexed with Schiff base to form a complex. The prepared complex greatly enhanced the antibacterial properties of the cellulose fibers. FT-IR, XRD, UV–vis and SEM-EDS results proved the successful synthesis of Schiff base and its copper (II) complex. The antibacterial tests indicated that the width of the inhibition zone of the as-prepared cellulose-based Schiff base-Cu (II) complex against E. coli and S. aureus increased by 472 % and 823 %, respectively, in comparison to the Schiff base ligand. This significant increase could be attributed to the incorporation of the copper ions (II). This Schiff base-Cu (II) complex containing cellulose-based antibacterial materials are expected to be widely used for biomedical application.
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CHEMICAL ENGINEERING SCIENCE
·
2019
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IF 3.372
Yuning Tang,Sa Wang,Xin Zhou,Ying Wu,Shikai Xian,Zhong Li
A facile and efficient room-temperature synthesis approach was proposed to prepare MOF material Cu(Qc) 2 (henceforth called RT-Cu(Qc) 2 ) with ultramicropores. RT-Cu(Qc) 2 was successfully synthesized at room-temperature by means of (Zn, Cu) hydroxyl double salt as intermediate within 1–12 h. The resulting RT-Cu(Qc) 2 exhibited excellent water vapor stability and its C 2 H 6 uptake reached 2.19 mmol/g at 288 K and 1 bar. Its C 2 H 6 /C 2 H 4 and C 2 H 6 /CH 4 uptake ratio at 298 K and 1 bar were up to 3.70 and 22.67, superior to benchmark MAF-49, Cu(Qc) 2 and ZIF-7. Its IAST-predicted C 2 H 6 /C 2 H 4 and C 2 H 6 /CH 4 selectivity reached 4.1 (1:1 v:v) and 35.9 (1:9 v:v) at 288 K and 1 bar, higher than most of ethane-capturing MOFs. Molecular simulation revealed well-defined host–guest match between Cu(Qc) 2 and ethane. Fixed bed experiments confirmed that ethane/ethylene or ethane/methane mixtures can be completely separated using RT-Cu(Qc) 2 . RT-Cu(Qc) 2 has great potential for separation of ethane/ethylene and the recovery of ethane from natural gas.
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Catalysts
·
2019
·Vol. 9
·期 11
·952
·
IF 3.444
Huiyuan Xue,Jingjing Xu,Xingxing Gong,Rongrong Hu
The in-situ hydrodeoxygenation of bio-derived phenol is an attractive routine for upgrading bio-oils. Herein, an active trimetallic Ni-Cu-Co/Al2O3catalyst was prepared and applied in the in-situ hydrodeoxygenation of bio-derived phenol. Comparison with the monometallic Ni/Al2O3catalyst and the bimetallic Ni-Co/Al2O3and Ni-Cu/Al2O3catalysts, the Ni-Cu-Co/Al2O3catalyst exhibited the highest catalytic activity because of the formation of Ni-Cu-Co alloy on the catalyst characterized by using X-ray powder diffraction (XRD), temperature programmed reduction (TPR), N2physisorption, scanning electron microscope (SEM), and transmission electron microscope (TEM). The phenol conversion of 100% and the cyclohexane yield of 98.3% could be achieved in the in-situ hydrodeoxygenation of phenol at 240 °C and 4 MPa N2for 6 h. The synergistic effects of Ni with Cu and Co of the trimetallic Ni-Cu-Co/Al2O3catalyst played a significant role in the in-situ hydrodeoxygenation process of phenol, which not only had a positive effect on the production of hydrogen but also owned an excellent hydrogenolysis activity to accelerate the conversion of cyclohexanol to cyclohexane. Furthermore, the catalyst also exhibited excellent recyclability and good potential for the upgrading of bio-oils.Keywords:bio-derived phenol;Ni-Cu-Co/Al2O3;in-situ hydrodeoxygenation;cyclohexane;hydrogenolysis
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Enyang Liu,Xiaoli Yin,Jinhui Hu,Sirong Yu,Yan Zhao,Wei Xiong
Many attentions have been attracted to prepare superhydrophobic coatings on the metal surfaces for their prominent properties, especially the self-cleaning and anti-corrosion properties. In this work, a facile electrodeposition method was applied to fabricate hierarchical Cu-Ni coating on the 316 L stainless steel , and the followed myristic acid modification was used to lower the surface energy. The water droplet would remain spherical on this coating, and measured water contact angle and sliding angle were 161.27° and 7.8°, respectively. The contaminants on the coating surface could be easily carried away by the closed water droplets. In addition, the coating could effectively hinder the deposition of salt solution. Besides, the coating could endure long-term acid solution immersion and natural placement. Moreover, it was verified that this superhydrophobic Cu-Ni coating formed a robust barrier to block the transmission of chlorine ions , thus corrosion damage to steel surface could be effectively relieved. This superhydrophobic Cu-Ni coating provides a novel strategy and promising applications for preventing various metal surfaces from being contaminated and corroded.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Lu Fan,Yingxi Wang,Ling Li,Jianggang Zhou
In this study, 2-amino-terephthalic acid was designed for construction of MOFs , and carbon quantum dots (CQDs) were designed to activate the Metal Organic Frameworks (MOFs) to be used as fluorescent sensor for selectively detection for Fe 3+ and Cu 2+ , enhancing the fluorescence to an “on” state by the hybrid with CQDs in the MOFs as activating agent; quenching the fluorescence to an “off” state by removal of CQDs through the metal competitive coordination substitution strategy. Using this strategy, the prepared CQDs/MOFs material can be used as a fluorescence “on-off” probe for highly sensitive detection of Fe 3+ and Cu 2+ in aqueous solution. It was found that the LOD of CQDs/MOFs for sensing Fe 3+ and Cu 2+ were 2.3 ppb and 1.3 ppb, respectively. It was proved that the CQDs/MOFs has little cytotoxicity to 4T-1 cells, indicating the potential application in the detection for Fe 3+ and Cu 2+ ions in cells.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Changhui Zhu,Haiyong Wang,Hu Li,Bijuan Cai,Wei Lv,Chiliu Cai,Chenguang Wang,Long Yan,Qiying Liu,Longlong Ma
Alloyed Cu−Ni encapsulated in carbon was prepared by loading Ni and Cu onto biochar (BC) through an initial wetness impregnation method under mild conditions. The bimetallic catalysts were exploited to perform selective hydrodeoxygenation (HDO) of 5-hydroxymethylfurfural (HMF). 2,5-Dimethylfurfural (DMF), a promising liquid fuel/fuel additive, could be obtained from HMF with the highest yield of 93.5% under the optimized conditions. During HMF HDO, two key intermediates, 5-methylfurfural (MFF) and 2,5-dihydroxymethylfuran (DHMF), dominating two distinct conversion pathways were systematically investigated by Arrhenius kinetics analysis. In addition, the turnover frequencies (TOFs) of HDO reaction over Cu−Ni/BC corresponding with Cu amount were thoroughly discussed, finding that the electron transfer from Cu to Ni in the alloy structure was beneficial to the HDO reaction and the conversion pathways can be regulated by reaction temperature variation. Importantly, the synergy of HDO of HMF by alloyed Cu−Ni metal and Lewis acid sites from oxide NiOx were hence clarified by systematic catalyst characterizations. The Cu−Ni/BC catalyst is stable for at least five consecutive runs to obtain the stabilized 81.9% of DMF since the third run.
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APPLIED SURFACE SCIENCE
·
2022
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IF 7.392
Yaoyu Zhang,Yuxiong Wang,Yue Liu,Huimin Xu,Zhongbiao Wu
Aiming at the coexistence of pollutants in the actual industrial process, the catalytic oxidation of acetonitrile and ethyl acetate mixture on the Cu–Ce/ZSM–5 catalyst was studied. The mutual inhibition effect during catalytic removal of acetonitrile and ethyl acetate mixture was observed. Acetonitrile showed a more obvious inhibitory effect on the conversion of ethyl acetate, and the introduction of ethyl acetate reduced the N 2 selectivity of acetonitrile oxidation. The simulation results demonstrated acetonitrile could be preferentially adsorbed on Cu center of the catalyst surface, leading to significant inhibition of the initial conversion of ethyl acetate. In addition, the coexistence of ethyl acetate would weaken the hydrolysis of acetonitrile to generate carboxylic acid and –NH x species. As such, no enough adsorbed NH x species could be used to reduce the NO x produced by excessive oxidation of acetonitrile, resulting in a decreased in N 2 selectivity. This study could provide reference on the application of catalysts for cyanide–containing waste gas degradation.
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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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ChemistrySelect
·
2023
·Vol. 8
·期 45
·e202303724
·
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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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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