PLoS One
·
2019
·Vol. 14
·期 7
·e0220005
·
IF 2.776
Shuyao Zhang,Zheling Zhang,Xiaoling Zhang,Jian Zhang
In present work, a highly sensitive biosensor with high selectivity for glucose monitoring is developed based on novel nano-composites of nitrogen doped graphene quantum dots (N-GQDs) and a novel bimetallic Cu/Ni core-shell nanoparticles (CSNPs) (Cu@Ni CSNPs/N-GQDs NCs). With the tuned electronic properties, N-GQDs helped bimetallic core-shell structure nanomaterials from aggregation, and separate the charges generated at the interface. This novel nano-composites also have the good electrical conductivity of N-GQDs, catalyst property of Cu/Ni bimetallic nano composite, Cu@Ni core-shell structure and the synergistic effect of the interaction between bimetallic nano composite and N-GQDs. While modified the electrode with this novel nano-composites, the sensor’ linear range is 0.09 ~ 1 mM, and the limit of detection (LOD) is 1.5 μM (S/N = 3) with a high sensitivity of 660 μA mM -1 cm -2 , and rapid response time (3 s). Its’ LOD is more than 74 times lower than the traditional Cu@Ni CSNPs modified working electrode. It also has higher sensitivity and wider linear range. This indicates the great potential of applying this kind of nano composites in electrode modification.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yufang Tao,Haibin Huang,Hui Zhang
A promising technology was proposed for the remediation of Cu and phenanthrene (PHE) co-contaminated soil. Firstly, Cu and PHE were simultaneously removed from soil using an extraction agent containing ethylenediaminetetraacetic acid (EDTA) and Tween 80 (TW80). Specifically, Cu was mobilized by the chelation of EDTA while PHE was desorpted from soil by TW80 micelles. At 20 mL g − 1 of liquid to soil ratio, 10 g L − 1 TW80 and 1 mM EDTA, 73.5% Cu and 68.1% PHE were removed by soil washing. The extraction agent was then recovered from effluent by photoelectro-persulfate (PE/PS) process after soil washing. Under the conditions of 10 mM PS, 4 mA cm − 2 current density, natural pH of 3.5 and 150 min treatment, 83.6% Cu was reduced to elemental copper but only 36.8% EDTA was recovered, while 99.6% PHE was eliminated and 94.0% TW80 was recovered. The result of quenching experiments indicated PHE was predominantly oxidized by sulfate radical, though hydroxyl radical and singlet oxygen were also identified by electron paramagnetic resonance technique. The recovered extracting agent could be reused for further three washing cycles. The results demonstrated that soil washing followed by PE/PS process could be a cost-effective remediation technology for heavy metal and organic co-contaminated soil.
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MICROCHIMICA ACTA
·
2012
·Vol. 180
·期 3
·219-226
·
IF 3.033
Jiang Xiujuan,Huang Lingman,Liu Xiaoming
Magnetic nanoparticles (MNPs) coated with silica gel were prepared, then functionalized with a tridentate ligand via a silane coupling agent (3-chloropropyl)triethoxysilane, and finally loaded with Cu(II) ions. The resulting materials were characterized by TEM, SEM, XRD, FTIR and TGA techniques. They display strong affinity for BSA with an adsorption capacity as high as 235 mg g −1 and with a fast (30 min) establishment of adsorption equilibrium. Repetitive adsorptions (6 times) hardly affect the adsorption capability. The kinetics and isotherm of the adsorption of BSA were also investigated.
Core-Shell magnetic nanoparticles functionalised with tridentate ligand BPA which binds Cu(II) were prepared. The materials adsorb BSA with high adsorption capacity (235 mg g −1 ) and fast establishment of adsorption equilibrium (30 min). Repetitive adsorption-desorption (6 times) did not affect significantly the adsorption capacity.
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BIOMACROMOLECULES
·
2018
·
IF 5.738
Donghao Wang,Wenyi Ding,Kaiyue Zhou,Shutong Guo,Qiang Zhang,David M. Haddleton
Immobilization of enzyme could offer the biocatalyst with increased stability and important recoverability, which plays a vital role in the enzyme’s industrial applications. In this study, we present a new strategy to build an intelligent enzyme carrier by coating titania nanoparticles with thermoresponsive epoxy-functionalized polymers. Zero-valent copper-mediated living radical polymerization (Cu(0)-LRP) was utilized herein to copolymerize N-isopropylacrylamide (NIPAM) and glycidyl acrylate (GA) directly from an unprotected dopamine-functionalized initiator to obtain an epoxy-containing polymer with terminal anchor for the “grafting to” or “one-pot” modification of titania nanoparticles. A rhodamine B-labeled laccase has been subsequently used as a model enzyme for successful immobilization to yield an intelligent titania/laccase hybrid bifunctional catalyst. The immobilized laccase has shown excellent thermal stability under ambient or even relatively high temperature above the lower critical solution temperature (LCST) at which temperature the hybrid particles could be facilely recovered for reuse. The enzyme activity could be maintained during the repeated use after recovery and enzymatic degradation of bisphenol A was proven to be efficient. The photocatalytic ability of titania was also investigated by fast degradation of rhodamine B under the excitation of simulated sunlight. Therefore, this study has provided a facile strategy for the immobilization of metal oxide catalysts with enzymes, which constructs a novel bifunctional catalyst that will be promising for the “one-pot” degradation of different organic pollutants.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Wanbing Gong,Chun Chen,Yong Zhang,Hongjian Zhou,Huimin Wang,Haimin Zhang,Yunxia Zhang,Guozhong Wang,Huijun Zhao
A copper-based catalyst, which was supported by sulfonate group (−SO3H) grafted active carbon (AC), was prepared and activated simultaneously by liquid phase chemical reduction method. The modified copper catalyst, Cu/AC–SO3H, displayed an enhanced catalytic performance for selective hydrogenation of furfural (FAL) to furfuryl alcohol (FOL) in liquid phase, in which almost 100% FOL yield was obtained at 378 K and 0.4 MPa of hydrogen pressure after 120 min reaction. The effect of −SO3H was evaluated and illustrated by the combination of reaction performance and physicochemical characterizations, such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectrometer (XPS) measurements. Through grafting sulfonate group on the support, better dispersion of nanoparticles, higher reduction degree of Cu, and stronger adsorption of FAL can be attained to contribute high hydrogenation performance. In addition, the effects of reaction conditions (such as reaction temperature, H2 pressure, reaction time, solvent, and catalyst to FAL mass ratio) were evaluated intensively. Also, the Cu/AC–SO3H catalyst showed an excellent catalytic performance for transfer hydrogenation of FAL, in which 2-propanol was utilized as the solvent and hydrogen donor concurrently. Cycling test proved the prepared catalyst could be recycled and reused for several times without noticeably reduced catalytic activity of hydrogenation.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 9
·4758-4769
·
IF 14.511
Lang He,Wenyuan Zhang,Kristin Zhao,Sheng Liu,Yan Zhao
A facile polymer thermal treatment method has been employed to fabricate 3D honeycomb-like nitrogen-doped graphitic carbons (N-GCs) with embedded core–shell Cu@Cu2O nanoparticles (NPs). The 3D honeycomb-like N-GC architectures can not only serve as an excellent carrier for core–shell Cu@Cu2O NPs, but also provide sufficient active sites and fast electron transmission channels. Under visible light irradiation, the Cu@Cu2O/N-GC-600 catalyst has the highest yields of CH4 and CO at 38.89 μmol g−1 and 27.78 μmol g−1, respectively. The excellent photocatalytic activity is attributed to the synergistic effects between the unique N-GC framework and core–shell Cu@Cu2O NPs, which accelerates the transfer of charge carriers and promotes the accumulation of photogenerated electrons on core–shell Cu@Cu2O. The results of this study may be beneficial for the design and synthesis of high-efficiency core–shell photocatalysts.
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ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Qian-Li Zhang,Jie-Ning Zheng,Tian-Qi Xu,Ai-Jun Wang,Jie Wei,Jian-Rong Chen,Jiu-Ju Feng
A simple, facile, and one-pot solvothermal strategy was developed to prepare Pd-on-Cu nanoparticles evenly distributed on reduced graphene oxide (Pd-on-Cu/RGO) in ethylene glycol systems, using cetyltrimethylammonium bromide (CTAB) as a structure-directing agent. Control experiments were demonstrated the critical role of CTAB and GO to the final morphology. The as-prepared nanocomposites exhibited the enlarged surface area of 64.98 m 2 g −1 Pd, improved electrocatalytic activity, and better stability for ethanol oxidation in alkaline media, which can serve as promising anode catalysts in direct alcohol fuel cells.
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CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Wenbo Wang,Guangyan Tian,Zhifang Zhang,Aiqin Wang
Silicate materials have been frequently used as stable, low-cost and efficient adsorbents for the removal of dyes and heavy metal ions from aqueous solution. Herein, at the aim of designing new adsorbent with higher adsorption capacity, natural palygorskite (PAL) was modified via a one-step hydrothermal process by introducing sodium silicate and magnesium salts. The effect of Si/Mg dosage ratio on the structure and physico-chemical features of the adsorbent was investigated, and its adsorption capability for Methylene blue (MB) and Cu(II) ions was intensively evaluated. It was found that Si/Mg dosage ratio is the key to control the adsorption properties of the adsorbent. The active magnesium silicate could be formed around PAL at the moderate Si/Mg dosage ratio, and even the undesirable quartz impurities without adsorption activity in the natural PAL minerals may transform as amorphous magnesium silicate with higher adsorption activity in this process. The adsorbent shows greater BET specific surface areas (407.3 m 2 /g), ideal surface charge distribution and superior adsorption capacity to MB and Cu(II) ions, with the maximum adsorption capacity of 527.22 mg/g for MB and 210.64 mg/g for Cu(II) ions at the Si/Mg dosage ratio of 2:1. The MB molecules and Cu(II) ion could be almost completely removed from 100 mg/L of MB solution and 25 mg/L of Cu(II) solution by the adsorbent, respectively, which is far away higher than that of raw PAL. The electrostatic attraction, ion exchange and chemical association of –Si–O − groups contribute to the enhanced adsorption for MB or Cu(II) ions.
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CARBOHYDRATE POLYMERS
·
2016
·
IF 4.219
Binyan Huang,Yunguo Liu,Bin Li,Shaobo Liu,Guangming Zeng,Zhiwei Zeng,Xiaohua Wang,Qimeng Ning,Bohong Zheng,Chunping Yang
Fe 3 O 4 @SiO 2 -Chitosan/GO (MSCG) nanocomposite was investigated by various techniques (SEM, TEM, XRD, VSM, FT-IR, XPS) for the removal of tetracycline (TC). Effects of pH, zeta potential and initial contaminant concentration were studied in detail. Four background cations (Na + , K + , Ca 2+ and Mg 2+ ) with a concentration of 0.01 M showed little influence on the TC adsorption at the studied pH range while the divalent heavy metal cation Cu(II) could significantly enhance the adsorption. The results indicated that the highest adsorption capacity of TC were 183.47 mmol/kg and 67.57 mmol/kg on MSCG with and without Cu(II), respectively. According to mechanism investigation for the adsorption of TC by pH impact study and XPS analysis, besides electrostatic interaction and π–π interactions, the Cu(II) also acts as a bridge between TC and MSCG, which significantly improve the adsorption of TC. This study provided valuable guidance and effective method for the removal of TC from aquatic environments.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Jiuyang Xia,Fengping Zhang,Juli Liang,Kaixin Fang,Wenwei Wu,Xuehang Wu
Commercial Cu foam can be employed as a 3D current collector to accommodate Na metal for stable sodium metal batteries (SMBs). However, few studies focus on regulating the interphase structure and properties of Cu foam to achieve fast and uniform Na impregnation. Herein, a facile and controllable oxidation treatment strategy is used to in-situ construct a fluffy CuO/Cu 2 O surface layer on the skeleton of Cu foam (SF–Cu-3.6). The oxidation degree and interphase structure of Cu foam can be rationally designed by adjusting the concentration of (NH 4 ) 2 S 2 O 8 oxidant, which is directly related to the driving force of Na infusion. With an optimized interface, Na metal can be rapidly infused into SF-Cu-3.6 within 5 s and a structurally complete Na/SF-Cu-3.6 composite electrode with a flat surface and no visible void can be obtained. The SF-Cu-3.6 with a large surface area can be used as a 3D host for Na metal to lower the local current density during cycling, resulting in uniform Na deposition without dendrite formation and growth. In virtue of the structural advantages, the symmetric Na/SF-Cu-3.6 cell exhibits flat charge/discharge plateaus with a low overpotential of 12 mV and stable cycling up to 1000 h at 0.5 mA cm −2 . When paired with NaTi 2 (PO 4 ) 3 , the rate performance of the full cell using the Na/SF-Cu-3.6 composite anode is significantly better than that of the full cell using a bare Na anode.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2025
·
IF 5.6
Xue Wang,Yuanyuan Zhang,Yingying Chen,Qing Ma,Hongzhuo Liu,Shi Jin,Guangqi Yan
Diabetic foot ulcers (DFUs) persist due to excessive reactive oxygen species (ROS), infection, and poor angiogenesis. We engineered an injectable guar gum hydrogel (AuCu-Arg/Gel) embedding gold/copper nanozymes (Au@Cu₂(OH)₃Cl– L -Arg) to address these barriers synergistically. The nanozymes display cascade-mimicking peroxidase, superoxide dismutase, and catalase activities to rebalance ROS. In the acidic, bacteria-laden niche, peroxidase-like activity is switched on, generating hydroxyl radicals (•OH) and driving bacterial viability to < 1 %. Concurrently, the ROS-rich milieu triggers nitric oxide (NO) release from L -arginine (2.93 μM in 10 min), upregulating VEGF and neovascularization. Mild near-infrared (NIR) photothermal heating (1.5 W cm⁻², 5 min) increased the apparent POD-like initial rate 1.94-fold vs no-NIR (see Fig. 2 A). without tissue injury. In diabetic rats, AuCu-Arg/Gel plus NIR accelerated wound closure, dampened inflammation, and increased collagen deposition and vascular density. The results confirmed day-12 residual wound areas to 2.1 % (AuCu-Arg/Gel + NIR). This spatiotemporally programmable platform integrates ROS modulation, on-demand antibacterial action, NO gas therapy, and photothermal enhancement for chronic wound management.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yupeng Wang,Xiangyuan Yu,Shulong Wen,Yihu Sun,Huibin Wei
The effective and economical removal of heavy metal-organic complexes remain an urgent challenge in the field of industrial wastewater treatment. In this study, Ca-doped ferrihydrite composites and Ca/Al co-doped ferrihydrite composites were synthesized via a simple one-step co-precipitation method and applied for the oxidative removal of EDTA-Cu in a hypochlorite system. The incorporation of Al significantly enhanced the material's stability. The Fe-Ca-Al composite exhibited a catalytic degradation efficiency of 97 % after 4 reaction cycles, representing a 32 % improvement compared to the Ca-doped ferrihydrite (Fe-Ca). Mechanistic studies revealed that the Fe-Ca-Al composite demonstrated strong selective adsorption of the organic moieties in EDTA-Cu over a broad pH range. Moreover, the oxygen vacancies (Ov) induced by Ca and Al co-doping played a crucial role in the enhanced catalytic performance and efficient removal of EDTA-Cu. These abundant Ov promoted electron transfer and provided numerous surface adsorption sites, facilitating the conversion of O 2 · - to 1 O 2 . Given that 1 O 2 can rapidly degrade organic compounds containing amino and carboxyl groups, it shows excellent potential for the treatment of EDTA-Cu. This study presents a highly active and reusable catalyst based on a Ca-Al doping strategy, offering a promising approach for the removal of organic-heavy metal complexes.
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