CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Quanfa Zhong,Qintie Lin,Runlin Huang,Hengyi Fu,Xiaofeng Zhang,Haoyu Luo,Rongbo Xiao
A nitrogen and copper codoped biochar (N-Cu/biochar) material was prepared and used to activate persulfate (PS) for tetracycline (TC) degradation. The material was characterized by SEM, FT-IR, XRD and XPS. The results showed that the N-Cu/biochar had a flaky carbon structure with urchin-like copper growing on the carbon surface, a large specific surface area of 352.43 m 2 /g that provided sufficient active sites for catalytic reaction, and abundant functional groups. Quenching experiments and electron paramagnetic resonance (EPR) experiments verified the reaction pathway mechanisms. The main free radical in the system was HO ; another possible mechanism is the nonradical pathway of electron transfer between TC and PS on the surface of the catalyst, and this electron transfer could lead to TC degradation. All the TC was removed within 120 min at a catalyst dosage of 200 mg/L, PS dosage of 0.5 mM, and pH of 7.0. Chloride and bicarbonate ions had little effect on the degradation of TC. HPLC-MS was used to investigate the main degradation intermediates and the possible transformation pathways were proposed. The toxicity of TC and its intermediates were evaluated by bioluminescence inhibition method. The high catalytic efficiency and low consumables of the N-Cu/biochar/PS system could provide a new strategy for the remediation of wastewater.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2018
·Vol. 18
·期 7
·2151
·
IF 2.475
Fei Qu,Jingwen Li,Wenli Han,Lian Xia,Jinmao You
Both adenosine triphosphate (ATP) and glucose are important to human health, and their abnormal levels are closely related to angiocardiopathy and hypoglycaemia. Therefore, the simultaneous determination of ATP and glucose with a single test mode is highly desirable for disease diagnostics and early recognition. Herein, a new fluorescence on/off switch sensing platform is developed by carbon nanodots (CNDs) to detect ATP and glucose simultaneously. The fluorescence of CNDs can be quenched by Cu2+and hydrogen peroxide (H2O2), due to the formation of hydroxyl radicals (·OH) produced in the Cu-Fenton reaction. Based on the high affinity of Cu2+with ATP, the fluorescence of CNDs will recover effectively after adding ATP. Additionally, glucose can be efficiently catalyzed by glucose oxidase (GOx) to generate H2O2, so the platform can also be utilized to analyze glucose. Under optimum conditions, this sensing platform displays excellent sensitivity and the linear ranges are from 0.1 to 7 μM for ATP with a limit of detection (LOD) of 30.2 nM, and from 0.1 to 7 mM for glucose with a LOD 39.8 μM, respectively. Benefiting from the high sensitivity and selectivity, this sensing platform is successfully applied for simultaneous detection of ATP and glucose in human serum samples with satisfactory recoveries.Keywords:simultaneous detection;Cu-Fenton reaction;carbon nanodots;adenosine triphosphate;glucose;satisfactory recoveries
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Yimeng Song,Donghui Yang,Shengnan Yu,Xinsheng Teng,Ze Chang,Fusheng Pan,Xianhe Bu,Zhongyi Jiang,Baoyi Wang,Sheng Wang,Xingzhong Cao
Tailoring the interface between the polymer matrix and filler to probe the structure-performance relationship is one of the critical research issues in hybrid membranes. In this study, metal organic framework (MOF) incorporated hybrid membranes are fabricated with polydimethylsiloxane (PDMS) as the matrix and Cu(II) loaded UiO-67-bpydc (bpydc refers to 2,2′-bipyridine-5,5′-dicarboxylic acid) as the filler, which are utilized for removing thiophene from model gasoline. The structure-performance relationship of the resultant membranes was investigated. The flux of the hybrid membrane shows a remarkable increase while avoiding obvious loss of selectivity. The loading of Cu(II) onto UiO-67-bpydc effectively tailors the interface between the polymer matrix and filler, which enhances the membrane separation performance. This study may offer a new example for designing MOF-based hybrid membranes towards efficient molecular separation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 6
·5136-5148
·
IF 2.993
Zou Faxing,Chen Heng,Chen Shaojun,Zhuo Haitao
Shape-memory polymers with supramolecular switch have received increasing attention. This study reports the synthesis and characterization of supramolecular shape-memory polyurethane based on Cu(II)–pyridine coordination, obtained by mixing pyridine containing polyurethane with CuCl 2 . The results show that there are strong metal–ligand coordination interactions formed between Cu(II) and the pyridine ring in a series of CuCl 2 -doped polyurethane samples. The Cu(II)–pyridine coordination plays a crucial role in the enhanced physical netpoints for outstanding shape-memory properties. Indeed, the so-synthesized CuCl 2 -doped polyurethane exhibits not only a rapid tensile shape recovery but also excellent crimp shape recovery. The CuCl 2 -doped polyurethane containing suitable metal–ligand coordination interactions shows more than 99% shape fixation and more than 95% shape recovery. Our findings promote further applications of shape-memory polymers in multiple engineering fields.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Xiaonuo Zhang,Xiaoyan Lin,Yu He,Yan Chen,Xuegang Luo,Ran Shang
Widespread concern had been given raise to the pollution of antibiotics including tetracyclines in water environment in recent years. A novel Cu-immobilized alginate adsorbent had been synthesized successfully through a facile fabrication way called sol-gel method, and its adsorption performance had been investigated for the tetracycline removal at various conditions, including the pH, temperature, the dosage of adsorbent, concentration and contact time. The adsorbent was characterized with SEM, EDX, FT-IR and XPS analyses to confirm its properties before and after adsorption. The equilibrium data was fitted well with the Freundlich isotherm model and the maximum adsorption capacity for tetracycline was 53.26 mg·g −1 at pH 3, 318.15 K, and 90 mg·L −1 tetracycline solution. The pseudo-second-order kinetic and Freundlich isotherm models combining with the correlative analysis implied that the tetracycline adsorption onto the Cu-immobilized alginate adsorbent was administrated by the n-π electron-donor-acceptor interaction (n-π EDA interaction), hydrogen bond and the cation bonding bridge. Moreover, thermodynamic study demonstrated that the nature of tetracycline adsorption was endothermic, feasible and spontaneous. Compared with the other adsorbents, the as-prepared adsorbent had an excellent tetracycline adsorption capacity, and was expected to be widely applied in the adsorption treatment of tetracycline wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Xiaopeng Han,Ying Huang,Qiao Gao,Meng Yu,Xuefang Chen
Weak interfacial bonding and the agglomeration of reinforcements are critical challenges for the expected performance in thermal management materials, hindering the extensive application of aluminum matrix composites. In this work, Cu particles, nanotubes, Ag-coated graphite flakes and films, urea, and starch were mixed together to fabricate porous preforms, which then were infiltrated by vacuum gas pressure at 720 °C. The effects of graphite film thickness on the microstructure and properties of thermal conductivity (TC) and coefficient of thermal expension were investigated. The nanotube@Cu/Ag@graphite/aluminum composites exhibited a high TC of 451 W/mK and excellent bending strength of 74 MPa, which were approximately increased by 48.8% and 126%, respectively, as compared with the samples without graphite film.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 46
·22055-22064
·
IF 7.233
Ting Wang,Dan Wu,Youliang Wang,Tingbo Huang,Gary Histand,Tingting Wang,Heping Zeng
Polyaniline(PANI)-decorated Cu nanoparticles were prepared by a facile solvothermal method. Different reaction temperatures resulted in different morphologies of the Cu/PANI composites, which exhibited good photocatalytic activities. When the mass ratio of PANI increased to 2.5 wt%, the H2 evolution rate reached 1.97 mmol g−1 h−1 in lactic acid solution under solar light irradiation, which is about 2 times higher than that of pure Cu nanoparticles (1.06 mmol g−1 h−1). The introduction of PANI can improve the separation efficiency of the photo-generated electron–hole pairs, where PANI acts as a hole reservoir for trapping holes generated by the Cu NPs and hindering the recombination of the electron–hole pairs. A possible mechanism is presented to explain the photocatalytic process using Cu@PANI core–shell nanospheres as the photocatalyst.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 24
·13696-13704
·
IF 3.049
Hong Lei,Ruheng Zheng,Yeping Liu,Jiacheng Gao,Xiang Chen,Xiaoliang Feng
Hydrogenation of CO2 to chemicals is of great importance in the reduction of greenhouse gas emission. And the interaction and/or the boundary between Cu and ZnO played a crucial role in the performance of the Cu–ZnO catalyst for CO2 hydrogenation to methanol. In this work, cylindrical shaped ZnO was first synthesized via controlled hydrothermal precipitation of Zn(CO2CH3)2·2H2O, and Cu was further deposited on ZnO via in situ reduction in aqueous solution. Characterizations indicated that the crystallization degree of ZnO decreased with the increasing content of Cu, while the exposed surface area of Cu exhibited a volcano shaped curve. It was found that the cylindrical shaped ZnO combined Cu catalysts were active for the hydrogenation of CO2, and the space time yield of methanol reached 0.50 g-MeOH (g-cat h)−1 at H2/CO2 = 3, 240 °C, 3.0 MPa, and 0.54 mol (g-cat h)−1, but the methanol selectivity decreases with the reduction of the (002) polar plane of ZnO. The conversion of CO2 and methanol selectivity were discussed with the detected exposed Cu surface area and the number of oxygen vacancies.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jian Hua Chen,Hai Tao Xing,Xue Sun,Zhen Bo Su,Yi Hong Huang,Wen Weng,Shi Rong Hu,Hong Xu Guo,Wen Bing Wu,Ya Shan He
In the present paper a new type of triethylenetetramine-magnetite reduced graphene oxide (TET-MRGO) composite showing a high adsorption capacity (209.1 mg g −1 ) toward Cu(II) ions was prepared. The morphological, structural, and magnetic properties of TET-MRGO were characterized using infrared spectrometer, X-ray diffraction, Scanning Electronic Microscope, nitrogen adsorption–desorption measurement, Raman spectroscopy, and Transmission Electron Microscopy. TET-MRGO exhibits strong saturation magnetization (42.13 emu g −1 ) and can be easily separated from aqueous solution by an external magnetic field. A series of batch adsorption experiments were systematically conducted to study the adsorption property of TET-MRGO. The high adsorption capacity, excellent selectivity, and effective adsorption–desorption results indicated the prepared TET-MRGO composite could be an effective adsorbent for removing Cu(II) ions from aqueous solution.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 35
·15645-15652
·
IF 4.197
Hanxing Chen,Teng Tu,Ming Wen,Qingsheng Wu
New Cu2O-on-Cu nanowires (NWs) are constructed to develop the visible-light-driven activity of photocatalysts via the facile self-assembly of Cu2O nanoparticles (NPs) on a Cu NW surface assisted by a structure director, followed in situ reduction. In the resultant Cu2O-on-Cu NWs, the Cu2O NPs, with a diameter of 10 nm, show good distribution on the 50 nm-sized Cu single-crystal NWs. Owing to the band-gap adjusting effect and high electron transportation, the coupling of narrow-band-gap semiconductor Cu2O and excellent conductor Cu can lead to the markedly enhanced high visible light photocatalytic activity of Cu2O-on-Cu NWs toward the degradation of dye pollutants including Rhodamine B (RhB), methyl orange (MO) and methyl blue (MB). The as-designed Cu2O-on-Cu heterostructured NWs exhibit higher performance for the catalytic degradation of dye compounds than pure Cu2O. Nearly 60%, 100%, and 85% conversion with reaction rate constants (k) of 0.0137, 0.0746 and 0.0599 min−1 can be achieved for the degradation of RhB, MO and MB, respectively. Besides the highly efficient transportation of electrons, Cu NWs have a strong capacity for oxygen activation, which results in the gathering of negative charges and rich chemisorbed oxygen onto the surface. This may be responsible for the high catalytic efficiency of the Cu2O-on-Cu NWs toward the degradation of organic pollutants.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Jie Sun,Shaolong Wan,Fen Wang,Jingdong Lin,Yong Wang
A variety of catalysts for higher alcohol synthesis from syngas have been under development for potential commercial application, which are still facing challenges, including poor carbon efficiency due to low selectivity to desired products. In this contribution, we systematically studied the effects of temperature, loading of K and Cs, space velocity, and CO2 addition on the alkali-promoted Cu/ZnO/Al2O3 catalysts in order to achieve a high yield of desired higher alcohol products. Our particular focus was to maximize the carbon efficiency by restricting the amount of undesired byproducts, such as lower alkanes and CO2 that could be formed. Among K and Cs promoted Cu/ZnO/Al2O3 catalysts studied, Cs-promoted Cu/ZnO/Al2O3 catalysts exhibit better performance to higher alcohols and higher carbon efficiency than K-promoted counterparts under similar conditions studied. 1.64 mol % Cs-promoted Cu/ZnO/Al2O3 catalyst achieves the highest selectivity to higher alcohols (24.9%) at a CO conversion of 41.6% under 290 °C, 1875 mL g–1cat h–1, 5.4 MPa. The presence of a small amount of CO2 of 2.5 mol % in the feed has negligible effect on the productivity of higher alcohols but significantly suppresses the formation of CO2 byproduct. With the further increase of CO2 in the feed, the formation of CO2 can be further suppressed but at the expense of productivity loss of higher alcohols, which is probably due to the neutralization of surface Cs sites. The best carbon efficiency can be achieved at 8% mol CO2 in the feed.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2015
·Vol. 50
·期 3
·255-262
·
IF 0.935
N. Lin,L. Z. Pei,T. Wei,H. Y. Yu
Cu vanadate nanorods have been synthesized via the hydrothermal process using polymer polyvinyl pyrrolidone (PVP) as the surfactant. X-ray diffraction (XRD) shows that the nanorods are composed of monoclinic Cu 5 V 2 O 10 phase. Scanning electron microscopy (SEM) observation shows that the diameter and length of the nanorods are 50–300 nm and 3 μm, respectively. PVP concentration, hydrothermal temperature and duration time play essential roles in the formation and sizes of the Cu vanadate nanorods. A PVP-assisted nucleation and crystal-growth process is proposed to explain the formation of the Cu vanadate nanorods. Gentian violet (GV) is used to evaluate the photocatalytic activities of the Cu vanadate nanorods under solar light. The GV concentration clearly decreases with increasing irradiation time, and content of the Cu vanadate nanorods. GV solution with the concentration of 10 mg L −1 can be totally degraded under solar light irradiation for 4 h using 10 mg Cu vanadate nanorods. The Cu vanadate nanorods have good photocatalytic activities for the degradation of GV under solar light.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）