JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Zhengjie Gong,Tao Ma,Feng Liang
Organic dyes and nitrophenols in the textile industry are wastewater pollutants. In order to develop an efficient nanocatalysts to remove organic pollutants in wastewater, the trimetallic Ni@Cu@Pd nanoparticles (Ni@Cu@Pd NPs) with a blackberry-like structure was successfully prepared by a seed mediated growth method for the first time. The blackberry-like structure and the presence of Ni, Cu and Pd have been confirmed through TEM, SEM, EDS and XPS characterizations. Owing to the charge interaction between metal species along with blackberry-like structure, trimetallic Ni@Cu@Pd NPs delivered a record high catalytic activity toward the reduction of rhodamine B (RhB), with an apparent rate constant of 7.20 min −1 . Ni@Cu@Pd NPs also exhibited high activity for the catalytic reduction of methylene blue (MB) and 4-nitrophenol (4-NP). Moreover, the Ni@Cu@Pd NPs catalyst showed excellent stability and reusability.
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yong Chen,Junfeng Zhao,Lu Hu,Jing Tian,Yong Liu
Most metal-organic frameworks (MOFs) are synthesized from carboxylate and metal precursors by hydrothermal process, which will consume a large amount of solvent and carboxylate. To address this issue, a new strategy for Cu-based MOFs was developed, in which the Cu-based MOFs was obtained by using abundant natural polymer (tannic acid) as one of the precursors and using high-energy ball milling to achieve a self-assembly of tannic acid and copper sulfate. Based on this strategy, a novel Cu-based MOFs derivative (Cu x O@C composite) was synthesized by high-temperature sintering of Cu-based MOFs and used for sulfamerazine (SMR) removal via O 2 activation. The BET specific surface area and average pore size of Cu x O@C composite were 110.34 m 2 g −1 and 21.06 nm, respectively, which made Cu x O@C composite had the maximum adsorption capacity ( Q max ) for SMR of 104.65 mg g −1 and favored the subsequent degradation of SMR. The results from XRD and XPS indicated that Cu x O@C composite contained a lot of Cu 0 and Cu 2 O with the sizes of 76.6 nm and 9.8 nm, respectively, which led to its high performance of O 2 activation. The removal efficiency of SMR and 90.2% TOC achieved 100% and 90.2%, respectively in the Cu x O@C/air system at initial pH of 4.0, air flow rate of 100 mL min −1 , Cu x O@C dosage of 1 g L −1 and reaction time of 30 min. Reactive species, including H 2 O 2 , OH and O 2 - radicals were detected in the Cu x O@C/air system, and OH and O 2 - were mainly responsible for the degradation of SMR.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 29
·39513-39523
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IF 4.223
He Jun,Song Wenchao,Huang Xiaohan,Gao Zuoyu
Magnesium oxide/expanded graphite (MgO/EG) catalyst was synthesized and applied for enhancing the degradation of Cu-ethylenediaminetetraacetic acid (Cu-EDTA) in an aqueous solution. The MgO/EG catalyst was characterized by XRD, SEM, EDS, and FTIR. For assessing the catalytic activity of MgO/EG, essential influencing factors were investigated including catalyst dosage, O 3 dosage, initial pH, initial Cu-EDTA concentration, and coexisting ions. The results show that the catalytic material showed high catalytic oxidation capacity for the Cu-EDTA removal in the MgO/EG/O 3 system. 100% of Cu(II) and 73.2% of TOC removal efficiency could be achieved in the MgO/EG/O 3 system at the reaction times of 90 min. This efficiency was higher than that seen for other systems, including O 3 alone (Cu(II) 81.4%/TOC 60.6%), EG/O 3 (84.2%/64.1), MgO/EG (< 4%/< 4%), and EG (< 4%/< 4%). A small decrease in the Cu(II) and TOC removal rate was observed after three runs in the stability and reusability experiments of the catalyst. Assays with radical scavenging experiments confirmed that MgO/EG-mediated oxidation was dependent on a hydroxyl radical pathway. The UV–vis spectra confirmed that the absorption peak of Cu-EDTA was gradually decreased and finally disappeared.
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Surfaces and Interfaces
·
2021
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IF 4.837
Zepeng Fang,Dagui Chen,Fengpo Yan,Jiangquan Lv,Yongjing Wang,Xiangfeng Guan
The water monitoring parameter of chemical oxygen demand (COD) is a universal way to assess organic pollution in aqueous systems. Though the ways for the detection of COD have been developed for decades, it is still a challenge to achieve highly sensitive and portable COD detectors. In this work, a new electrode composite of Ni/ZnO/Cu (CE-1) was prepared for the electrochemical tests of COD. The electrode was structural characterized by using scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray Diffractometer (XRD), which showed that self-supported Cu microflowers were successfully electrodeposited on the ZnO micro-prims that were firstly loaded on the Ni foils. The electrochemical behaviors were investigated with the comparison of CE-1 and the electrode that Cu nanoparticles were directly deposited on the Ni foil (CE-2). It shows that CE-1 possesses much superior electrochemical properties than CE-2, which indicates that the introduction of ZnO micro-rod the electrode can significantly enhance the electrocatalysis property. CE-1 exhibited a linear COD detection range of 2.3603 to 577.8 mg/L as well as an excellent correlation with the classic dichromate method (R 2 = 0.99933). Moreover, low detection limit of 0.6036 mg/L (the signal blank/slope=3) and high sensitivity of 2.403 × 10 −2 mA / (mg • L −1 ) can be simultaneously achieved by using CE-1, which is hard to attain for its counterparts reported in literature. CE-1 also shows good concordance with the classic method for real water sample detections. Consequently, the environmentally friendly CE-1 is supposed as a promising candidate for COD detection electrode.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Le Li,Ting Liu,Meifang Wang,Yong'an Ren,Nan Jia,Huaiyu Bu,Gang Xie,Hang Xu,Yongli Wu,Xiangyuan Ouyang
Herein, we synthesized snowflake-like DNA crystals (SDC) via hybridization chain reaction and used it for the first time in the synthesis of copper nanoclusters with enhanced fluorescence. Atomic force microscopy (AFM) and laser confocal microscopy characterization confirmed that SDC/CuNCs are self-assembled successfully on SDC. Aggregation induced emission allows SDC/CuNCs to exhibit better stability and stronger emission intensity. Thus, we developed the “turn-on” label-free fluorescence detection method of actin based on SDC/CuNCs which offer simplicity, low cost, good selectivity , and high sensitivity. The detection limit was determined to be 0.0124 μg mL −1 , which was an order of magnitude lower than that of reported fluorescent methods (0.12 μg mL −1 ). Compared with previous method, the linear range is also much wider. We also performed standard recovery experiments in actual samples for evaluating the practicality of this strategy and proved that the capability of the proposed approach for the determination of actin is feasible and the interference from complex biological samples is negligible. These results indicate that SDC/CuNCs are expected to play a more important role in the field of biosensors .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Bingqiao Yang,Mengyuan Zeng,Huanyu Zhu,Pengliang Huang,Zhili Li,Shaoxian Song
The effective separation of molybdenite from chalcopyrite is a challenging job. In this work, an environmental-friendly reagent pectin was investigated as a novel molybdenite depressant in the flotation separation of Cu-Mo sulfides. The micro-flotation results indicated that pectin selectively depressed molybdenite, and satisfactory separation results were achieved using sodium butyl xanthate (SBX) as collector even in the presence of kerosene. The addition sequence of pectin and kerosene influenced the depression of molybdenite significantly but hardly affected the flotation of chalcopyrite. The pre-adsorption of kerosene prior to pectin on molybdenite surface slightly attenuated the depression effect, while the pre-adsorption of pectin before kerosene moderately diminished the depression effect. Zeta potential , contact angle and Fourier Transform Infrared Spectroscopy (FTIR) suggested that pectin was adsorbed on molybdenite and chalcopyrite surface mainly through hydrophobic interaction and electrostatic attraction, respectively. SBX replaced the adsorbed pectin from chalcopyrite surface and restored its hydrophobicity . However, SBX hardly adsorbed on pectin treated molybdenite and molybdenite surface maintained hydrophilic.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 11
·4450-4463
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IF 3.665
Kexin Chen,Dong Yang,Yongqian Shi,Yuezhan Feng,Libi Fu,Chuan Liu,Ming Chen,Fuqiang Yang
The design of high-performance compounded flame retardants based on multielement can be of great significance for reducing the flammability of polymer materials. In this article, a new type of N-P-Cu containing supermolecular assembly network (MPCSN) flame retardant was prepared and subsequently added into thermoplastic polyurethane elastomer (TPU)/silicon microencapsulated ammonium polyphosphate (SiAPP) composites. The obtained results indicated that a series of TPU/SiAPP/MPCSN composites exhibited strong adhesions with the TPU matrix. Additionally, the thermal and flame retardant performances of TPU composites were markedly improved after the introduction of different proportions of SiAPP to MPCSN. For example, the peak of heat release rate, the total heat release, the peak of smoke production rate, the total smoke release of the TPU composite containing 7.5 wt% SiAPP and 2.5 wt% MPCSN (TPU/SiAPP3/MPCSN1) remarkably decreased by 68.7%, 52.9%, 52.4%, and 49.4%, respectively, besides the highest LOI value (27.5 vol%) and UL-94 V-0 rating, compared with those of pure TPU. The improved flame retardance of the TPU/SiAPP3/MPCSN1 composite was due to the explanations: On one hand, a compact intumescent char effectively protected the TPU matrix from heat and oxygen and retarded the gaseous products permeation into the combustion zone; on the other hand, evolved phosphorus-containing free radicals captured the H• and HO• generated from the TPU material. The synergistic effect of SiAPP and MPCSN resulted in strong flame suppression, accompanied by 10.8% and 37.8% reductions in FIGRA and Av-EHC, respectively. This article offers a facile approach to fabricate highly effective flame-retardant TPU composites.
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JOURNAL OF SOLID STATE CHEMISTRY
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2021
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IF 3.498
Wei Shuang,Hui Huang,Ming Liu,Tianyu Bai,Jijie Zhang,Danhong Wang
Copper sulfides are proved to be good candidates as anode materials for sodium ion batteries due to their abundant resources, moderate cost, and relatively high electrical conductivity . However, poor rate performance and cycling life still hinder their development as anode materials for sodium-ion batteries. Herein, we synthesized carbon-coated copper sulfide nanorod assembled into octahedron composites (CuS x @C) by sulfuration of a Cu-based metal-organic framework (Cu-MOF) under different temperatures. These composites with hierarchical structure exhibited superstable cycling performance as anodes of sodium-ion batteries. The CuS x @C sample obtained under 500 °C showed discharge capacity of 208 mA h g - 1 at 2 A g - 1 over 6300 cycles. Porosity and hierarchical stucture facilitate the storage of sodium ion, and carbon-coated structure buffers volume change of anode materials during the electrochemical reaction .
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CARBON
·
2021
·
IF 9.594
Xiaofang Li,Chunlei Tan,Juantao Jiang,Shaoyi Wang,Fenghua Zheng,Xiaohui Zhang,Hongqiang Wang,Youguo Huang,Qingyu Li
High-efficient heat dissipation is essential to maintain the best performance of the electron devices . A new electron thermal conductive route is first proposed and constructed for the graphene metal matrix composites in this work. Functionalization of graphene with conjugated 4-ethynylaniline (FGr) and deposition of FGr and Cu 2+ ions onto the copper surface by pulsed-current co-electrodeposition are successively employed to prepare the FGr/Cu composite. The resulting thermal diffusivity of FGr/Cu is high as 1.444 cm 2 s −1 at 100 °C, which is corresponding to the thermal conductivity of 497 W m −1 K −1 and higher than the reported values via single phonon thermal conductive route. FGr/Cu can maintain a superior and stable thermal conductive property at high temperature with a multiple of 1.61 and 1.31 at 100 °C and 150 °C compared to the Cu, respectively. The delocalized conjugated π bond in the graphene/Cu interface is successfully established through the bridging of graphene and metal with conjugated organic molecule possessing p orbits, which leads to the construction of a new electron thermal conductive route. This innovation presents an entirely new direction to develop graphene-based metal matrix composite with high-efficient heat dissipation.
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CHEMOSPHERE
·
2020
·
IF 5.778
Deyun Zhang,Yunong Li,Jing Guo,Lixiang Zhou,Yeqing Lan,Cheng Chen
In this study, magnetic Cu and Ni bimetallic particles embedded carbon sheets, namely as C@Cu–Ni, was derived via calcining a mixture of Cu-MOFs and Ni-MOFs (mass ratio = 4:6) under N 2 protection and served as a catalyst for the degradation of 2,4,6-trichlorophenol (2,4,6-TCP) by peroxymonosulfate (PMS). The results showed that more than 98.5% of 2,4,6-TCP (10 mg L −1 ) was rapidly decomposed at initial pH = 5, PMS = 1 mM and catalyst dosage = 0.1 g L −1 within 30 min, accompanied by 42.47% removal of total organic carbon (TOC). This fully confirmed that C@Cu–Ni possessed excellent catalytic performance for PMS activation . The radical quenching experiments and electron paramagnetic resonance (EPR) investigation testified that the reactive oxygen species (ROS) included SO 4 •− , • OH, O 2 •− radicals and singlet oxygen ( 1 O 2 ), which were responsible for the rapid degradation of 2,4,6-TCP. Among them, O 2 •− and 1 O 2 played a decisive role. Cyclic voltammograms (CV) and electrochemical impedance spectroscopy (EIS) revealed that C@Cu–Ni material possessed superior electrical conductivity and electron transfer , improving its catalytic activity . What is more, C@Cu–Ni displayed excellent stability and could be consecutively used for five times without any decline of catalytic performance. The main intermediates of the 2,4,6-TCP degradation were analyzed by high-performance liquid chromatography-mass spectrometry (HPLC-MS/MS) and possible pathways of 2,4,6-TCP degradation were further proposed. The extraordinary stability and superior catalytic activity of C@Cu–Ni coupled with its easy separation from wastewater due to magnetism suggest that the newly synthesized material may offer a promising alternative approach to efficiently degrade organic pollutants by PMS.
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高影响因子
LANGMUIR
·
2020
·
IF 3.557
Xiao-Qin Wu,Pei-Qi Feng,Zhiqiang Guo,Xuehong Wei
An electrochemical biosensor based on a water-stable one-dimensional double-chain Cu(II) metal–organic framework (Cu-MOF) directly was constructed for efficiently recognizing l-tyrosine (l-Tyr) in biomimic environments. Cu-MOF: {[Cu(bpe)(fdc) (H2O)(DMF)]·0.5H2O}n (bpe = 1,2-di(4-pyridyl)ethylene, H2fdc = 2,5-furandicarboxylic acid, namely, Cu-1) was synthesized by a hydrothermal method. It was characterized by IR, scanning electron microscopy, atomic force microscopy, and PXRD techniques. Cu-1 exhibited extreme solvent and thermal stability as well as excellent electroconductive character. It was coated on a glassy carbon electrode (GCE) surface to prepare an electrochemical biosensor (Cu-1/GCE) which showed preferable biosensing ability toward l-Tyr. This Cu-MOF electrochemical biosensor showed simple operation and high sensitivity toward l-Tyr in the concentration range from 0.01 to 0.09 mM. The detection limit is 5.822 μM. Furthermore, Cu-1/GCE showed extremely excellent selectivity to l-Tyr in a biomimic environment with several amino acid interferents. This new strategy exhibits great potential applications for designing MOFs with excellent electrochemical activity.
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ENERGY & FUELS
·
2020
·
IF 3.421
Xiangchen Kong,Chao Liu,Yue Han,Ming Lei,Yuyang Fan,Ming Li,Rui Xiao
The development of an economic and sustainable catalytic system was crucial for lignin-based biorefinery. Herein, we reported a low-cost Cu/CuMgAlOx catalyst with promising activity toward lignin hydrodeoxygenation (HDO) through a H2-free method. Supercritical methanol was used as the hydrogen donor, solvent, and reactant simultaneously. Guaiacol was employed as a representative lignin model compound to reveal the HDO mechanism of lignin derivatives. HDOs of guaiacol performed at 250, 275, 300, and 350 °C with durations ranging from 15 to 120 min indicated a high HDO efficiency of the catalytic system. The obtained liquid products were categorized to oxygen-containing unsaturated products (OUPs), oxygen-containing saturated products (OSPs), and cycloalkanes. A kinetic model based on a simplified reaction process containing the three following conversion steps was established: guaiacol transformed to OUPs through the initial HDO, then hydrogenated to OSPs (medium HDO), and eventually turned to cycloalkanes by the deep HDO. The deep HDO was the rate-determining step, and the apparent activation energies of the three steps were all lower than those in the literature. Phenol, 1,2-cyclohexanediol, anisole, and veratrole were the major intermediates, the HDOs of which were programed for pathway verification. Remarkably, catechol (the culprit of condensation) was not produced in this system. Overall, a detailed reaction network of guaiacol HDO was established, and the veil of Cu/CuMgAlOx-catalyzed lignin-derivatives HDO in supercritical methanol was revealed. This work paved the way for the application of Cu/CuMgAlOx catalyst in lignin-derivatives upgrading.
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