NANOTECHNOLOGY
·
2021
·Vol. 33
·期 3
·035601
·
IF 3.874
Jian-Hang Yin,Mengxuan Liu,Lei Meng,Nai-Di Tan,Na Xu
In this work, we reported a facile reduction approach for fabrication of water-soluble and ultrabright Cu nanoclusters with core–shell structure. A certain amount of reducing agent as NaBH4 was introduced into the polyethyleneimine-stabilized Cu nanoclusters (CuNCs@PEI) system, which exhibited 4-fold fluorescence enhancement along with a blue shift of the emission peak. The variations of morphology, valence states and functional groups demonstrated that a Cu shell was formed surround CuNCs (defined as CuNCs-Cu@PEI), attributable to metal complex (PEI-Cu+ and PEI-Cu2+) reduction. The effect of core–shell morphology on luminous and electron relaxation mechanism of CuNCs-Cu@PEI was investigated via temperature-dependent steady and time-resolved fluorescence measurements. The CuNCs-Cu@PEI with a high fluorescence quantum yields of 22.59% were able to homogeneously disperse in aqueous phase, indicating their potential applications in biological labeling, sensing and in vivo imaging. Finally, the CuNCs-Cu@PEI was employed as a fluorescence probe to determine 4-nitrophenol, of which the detection limit was much lower than initial CuNCs@PEI.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yukun Gao,Chenmeng Zhang,Yunxia Yang,Nan Yang,Sichen Lu,Tingting You,Penggang Yin
A high sensitive micro/nano-structured glucose sensor via Surface Enhanced Raman Spectroscopy (SERS) detection and electrochemical analysis was developed in this work. Ag nanodendrites/Cu mesh substrate were prepared through facile electrochemical deposition method, which exhibited high SERS sensitivity and electrocatalytic activity . By SERS measurements, glucose can be detected as low as 0.005 mM and exhibit a good linear relationship between concentrations (0.5–5 mM) and the SERS intensities. Moreover, glucose in human urine with different concentrations were successfully detected by the substates. By electrochemical method, the conductivity was firstly tested by CV and ESI tests. Amperometric responses of 0.5 mM glucose were compared with Cu mesh electrode, and the Ag nanodendrites/Cu mesh electrode showed higher electrochemical detection sensitivity. Results revealed the Ag nanodendrites/Cu mesh substrate can be used as glucose sensor with high detection sensitivity, reproducibility, selectivity and practicability, which has great potential in noninvasive medical diagnosis in further works.
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Water Supply
·
2022
·Vol. 22
·期 8
·6603-6614
·
IF 1.768
Zhang Fengrong,Zhang Binghan,Han Dandan,Fang Shaokang,Wu Lishun,Hou Wanguo
Using Al(OH) 3 and Mg(OH) 2 as raw materials, MgAl layered double hydroxides (LDHs) modified from birch leaves were prepared by the ball-milling–hydrothermal method, denoted as LDHs/BL, and used for the treatment of wastewater containing Cu(II). The morphology, crystal shape, and specific surface area of the samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and BET-specific surface area analyzer. The results showed that the prepared LDHs/BL composites had good crystal shape, large specific surface area, and suitable pore structure. Langmuir and Freundlich adsorption isotherm models were used to analyze the adsorption. The results showed that the adsorption conforms to the Freundlich adsorption isotherm model. Under the same adsorption conditions, the adsorption capacity of the LDHs/BL complex was higher than that of LDH, the removal efficiency of the former was 92%, and that of the latter was 68%. The adsorption mechanism includes metal precipitation and isomorphic replacement. More importantly, this study provides a green method to prepare LDHs. LDHs/BL composites are expected to be used as a new kind of environmental adsorbent for wastewater treatment. This work provides a new idea for the utilization of agricultural and forestry wastes. Nanocomposites of LDHs/BL were fabricated. The LDHs/BL nanocomposites exhibit enhanced sorption capacities for Cu(II). The nanocomposites are potential sorbents for wastewater treatment. The synthesis of LDHs/BL nanocomposites provides a win–win strategy.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Shuai Tang,Lujian Lin,Xuesong Wang,Anqi Yu,Xuan Sun
In water environments, nylon microplastics (MPs) and heavy metals are two kinds of common pollutants. This study investigated the adsorption of three divalent metals (Cu(II), Ni(II), Zn(II)) onto collected nylon MPs as function of contact time, temperature, solution pH, ionic strength and concentration of fulvic acid (FA). The kinetic data fitted well with the Elovich and pseudo-second order equations. The result of shrinking core model (SCM) confirms that the adsorption of Cu(II) and Zn(II) was mainly controlled by intraparticle diffusion. The adsorption of three metal ions onto collected nylon MPs is spontaneous, endothermic, with an increased randomness in nature. The Langmuir and Freundlich models successfully described the adsorption isotherms. The speciation distributions of three divalent metals in aqueous solutions were identified to analyze the effects of initial solution pH, ionic strength and fulvic acid concentrations on the adsorption amounts. X-ray photoelectron spectroscopy (XPS) analysis indicates the importance of surface O-containing groups of collected nylon MPs in controlling the adsorption of three metal ions. This research provides a clear theoretical basis for the behavior of nylon MPs as heavy metals (Cu(II), Ni(II), Zn(II)) carrier and highlights their environmental toxicity, which deserves to be further concerned.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 21
·9922-9929
·
IF 9.931
Yang Chen,Bohan Shan,Chengyin Yang,Jiangfeng Yang,Jinping Li,Bin Mu
Two environmentally friendly and efficient synthesis methods, NH3-assisted synthesis and solvent-evaporated conversion, have been developed for the synthesis of a series of M(NA)2 (M = Zn, Co, Cu, Cd; NA = nicotinate) flexible MOFs. The two-dimensional M(NA)2 (M = Zn, Co) and three-dimensional M(NA)2 (M = Cu, Cd) materials exhibit peculiar structural transformation. These frameworks can be obtained from dehydration of M(NA)2(H2O)4 (M = Zn, Co, Cu, Cd) which are zero-dimensional supramolecular structures. Interestingly, the structural transformation of M(NA)2 (M = Zn, Co, Cd) is reversible after liquid water adsorption. Due to the flexible structure of these MOFs, they exhibit abnormal NH3 adsorption properties. The two-dimensional Zn(NA)2 shows a gate-opening behavior for NH3 adsorption. Its layers opened at a pressure of 0.22 bar in the first cycle, resulting in a two-step NH3 uptake with a capacity of 10.2 mmol g−1 at 1 bar. The gate-opening pressure shifted to a lower value with cycles. Co(NA)2 has a huge NH3 uptake of 17.5 mmol g−1, which is top-ranking among the reported values. For the NH3 adsorption over Cu(NA)2 and Cd(NA)2, the adsorption rates increase and adsorption equilibrium is achieved faster after three cycles. Their maximum capacity at 1 bar is 13.4 and 6 mmol g−1, respectively. More importantly, all MOFs can be regenerated under vacuum and heating conditions of 150 °C for 70 min, and they all retained the capacity. The advantages of environmentally friendly synthesis, large adsorption capacity, and regenerable properties indicate that M(NA)2 (M = Zn, Co, Cu) are promising candidates for NH3 adsorption.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Liuting Mo,Yulin Shen,Yi Tan,Shifeng Zhang
Water contamination by heavy metal pollutants is a global concern due to detrimental effects on the environment and human health. Regenerable, high-performance heavy metal sorbents are urgently demanded for improved water purification . Herein, we present an elegant strategy of interweaving metal–organic framework (MOF-808-ethylene diamine tetraacetic acid) and TEMPO-oxidized cellulose nanofibers (TCNF) to construct freeways in hybrid aerogels for rapid and efficient transport and capture of heavy metal ions. In this strategy, a postsynthetic ligand exchange approach is applied to introduce ordered and high-density accessible binding sites for metal ions. The prepared aerogels show excellent shapeability, ultralow density less than 0.005 g cm −3 , and high hierarchical porosity of 99.82%. Furthermore, benefiting from the abundant chelating groups and accessible surface areas, these aerogels exhibit outstanding uptake capacity of 300 mg g −1 and rapid adsorption kinetics of 0.031 mg g −1 h −1 for Cu(II) ions, significantly better than conventional TCNF aerogels. The aerogels could be easily regenerated at least five cycles without greatly performance loss. These aerogels could effectively remove diverse heavy metal ions from complicated contaminated water. Thus, this work provides a novel method to synthesize environmental-friendly, regenerable, and high-performance adsorption materials for water remediation.
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Catalysis Science & Technology
·
2022
·Vol. 12
·期 22
·6782-6794
·
IF 6.177
Yuxi Xu,Huijiang Huang,Lingxin Kong,Xinbin Ma
Copper–zirconium catalysts have been extensively applied in the hydrogenation of carbon–oxygen bonds such as in CO2 and esters. However, high-performance Cu/ZrO2 catalysts with low copper loading for dimethyl oxalate (DMO) hydrogenation to ethylene glycol (EG) are seldom reported. Herein, we fabricated 5 wt% Cu/ZrO2 catalysts by a co-precipitation method and investigated the effect of calcination temperature on the catalyst structure and the corresponding catalytic performance. The crystallization and migration of zirconium and copper species are not simultaneous when increasing the calcination temperature, so the elemental composition of Cu and Zr species is different on the surface and in the bulk CuZrO2 solid solution. The crystalline morphology of ZrO2 is transformed from a-ZrO2 to t-ZrO2 and m-ZrO2 and copper dispersion is also changed. The CZ-600 catalyst has the largest copper dispersion, surface area of Cu0 and Cu+ and strongest H2 adsorption ability, which endow this catalyst with the best catalytic performance. However, TOF values are the largest for the CZ-550 catalyst with a larger ratio of Cu+, oxygen vacancies and Zr3+, which suggests the interfacial synergy between Cu and ZrO2 in DMO hydrogenation. And further increasing the calcination temperature to above 700 °C will cause the aggregation and sintering of copper nanoparticles and deteriorate the hydrogenation reactivity.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Pei Qiu,Jinyan Xiong,Mengjie Lu,Lijun Liu,Wei Li,Zhipan Wen,Weijie Li,Rong Chen,Gang Cheng
Solar-driven photocatalytic H 2 evolution could tackle the issue of fossil fuels-triggered greenhouse gas emission with sustainable clean energy. However, splitting water into hydrogen with high performance by a single semiconductor is challenging because of the poor charge separation efficiency. Herein, a novel ternary Cu@TiO 2 -Cu 2 O hybrid photocatalyst with multiple charge transfer channels has been designed for efficient solar-to-hydrogen evolution. Indeed, the ternary Cu@TiO 2 -Cu 2 O hybrid by coupling Cu@TiO 2 with Cu 2 O nanoparticles shows highly-efficient photocatalytic hydrogen generation with rate of 12000.6 μmol·g −1 ·h −1 , which is 4.4, 2.1, and 1.9 times higher than the pure TiO 2 (2728.8 μmol·g −1 ·h −1 ), binary Cu@TiO 2 (5595.5 μmol·g −1 ·h −1 ), and TiO 2 -Cu 2 O (6076.8 μmol·g −1 ·h −1 ) composite, respectively. In such a Cu@TiO 2 -Cu 2 O hybrid, the formed internal electric field in the TiO 2 -Cu 2 O p-n junction allows the electrons in Cu 2 O to migrate to TiO 2 , while the electrons in the CB of TiO 2 could flow into Cu via the Schottky junction at the Cu@TiO 2 interface. In this regard, a multiple charge transfer is achieved between the Cu@TiO 2 and Cu 2 O, which facilitates promoted charge separation and results in the construction of electron-accumulated center (Cu) and hole-enriched surface (Cu 2 O). This p-n/Schottky junctions with steered charge transfer assists the hydrogen production upon the Cu@TiO 2 -Cu 2 O ternary photocatalyst.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Liman Chen,Yang Yang,Guixiang Wang,Yanli Wang,Simon Ochieng Adede,Meng Zhang,Caishan Jiao,Di Wang,Dashuai Yan,Yibo Liu,Duanjie Chen,Weibing Wang
A new three-layered film was fabricated on magnesium (Mg) alloy via electroplating to guard against corrosion in a chloride aqueous environment, which consisted of an underlying double-layered zinc/copper (Zn/Cu) and a top aluminum–zirconium (Al–Zr) layer. The Zn/Cu underlayers not only impeded the galvanic corrosion between the Al–Zr coating and Mg alloy but also improved the adhesive ability between the substrate and the upper Al–Zr layer. Herein, we discussed the nucleus sizes of Al–Zr coatings at the stage of nucleation carried out with different contents of ZrCl4 in AlCl3–1-butyl-3-methylimidazolium chloride ionic liquid. The sandwichlike three-layered Zn/Cu/Al–Zr coatings were systematically investigated by surface morphology, phase structure, hardness, anticorrosion performances, and first-principles calculations. The corrosion current density declined from 1.461 × 10–3 A·cm–2 of bare Mg to 4.140 × 10–7 A·cm–2 of the Zn/Cu/Al–Zr3 sample. Neutral salt spray testing demonstrated that the Zn/Cu/Al–Zr3 sample showed no evident signs of corrosion after 6 days of exposure. The enhancement of the corrosion protection property was related to the fact that the application of the Cu layer changed the corrosion direction from initial longitudinal corrosion to extended lateral corrosion and the top Al–Zr coating hindered the transmission of aggressive ions. In addition, upon increasing the Zr content in the alloy films, the Fermi energy reduced initially and then increased. The Al–Zr3 alloy with 8.3 atom % Zr showed the lowest Fermi energy (−3.0823 eV), which exhibited the most efficient corrosion protection. These results showed that the prepared three-layered coating provided reliable corrosion protection to Mg alloy and may thus promote its practical applications.
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CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Liang Xiao,Ya Xiong,Shuanghong Tian,Chun He,Qingxian Su,Zhanhao Wen
A coordination supramolecular polymer, [Cu(bipy)(SO 4 )] n , was prepared as an adsorbent. It has a molecular structure of one-dimensional chain with dense adsorption sites. Three divalent dyes including Congo red, Orange G and Reactive Brilliant red X-3B were tested as pollutants in the adsorption study. The adsorbent showed extraordinary adsorption capacity for all three dyes, reaching 2429 mg/g, 915 mg/g and 1333 mg/g for Congo red, Reactive Brilliant red X-3B and Orange G, respectively. The Langmuir isotherm model can well describe the adsorption isotherm. In kinetic study, all of the three dyes presented a model of pseudo second-order. According to the kinetic rate constants, the adsorption processes are very fast and different for three dyes. The difference can be attributed to the divalent character and the different structure of the dye’s molecule. Based on their discrepancy of adsorption velocity, separation of dyes was attempted through kinetic separation between Congo red and X-3B. A separation coefficient was developed, which can well describe the separation performance results. The results show that the two dyes can be separated quickly and efficiently by [Cu(bipy)(SO 4 )] n .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhe Liu,Qi Liu,Xuhua Zhang,BingRui Shi,Dandan Qin,Jiaxuan Wang,Aining Zhang,Yongjun Liu
In this study, the sewage sludge was converted into sludge biochar (SBC) and doped with Cu-Ni bimetal to synthesize a novel composite catalyst (Cu-Ni@SBC) for the activation of H 2 O 2 for phenol degradation. Characterization results showed that the Cu-Ni bimetal was successfully doped into the SBC and led to the formation of a porous structure with abundant cavities, resulting in a larger specific surface area and higher adsorbed oxygen content. Mechanism analysis revealed a valence state conversion cycle between Cu 0 -Cu(II), Ni(III)-Ni(II) and Cu-Ni which made Cu-Ni@SBC have higher electron transfer performance. Response surface methodology was applied to determine the optimal preparation and reaction conditions, under which the Fenton-like system composed of Cu-Ni@SBC and H 2 O 2 removed 100 % of phenol and mineralized 69.1 % of TOC from simulated wastewater. In addition, the experimental results showed that the Cu-Ni@SBC material had a relatively wide pH adaptation range (4–8), and the removal efficiency of phenol could reach 76.4 % after 5 cycles of experiments, and the catalytic inhibition rates of the two common coexisting anions, HCO 3 – and Cl - , were 17.1 % and 0 %, respectively. The results of practical application revealed that the phenol removal efficiency reached 90.44 % and the pollutant mineralization rate could reach 58.5 % within 90 min, which proved that the catalyst was suitable for the advanced degradation of organic matter in coal chemical wastewater. Therefore, Cu-Ni@SBC can be considered as a promising Fenton-like catalyst, and the process method is also of some guiding significance for the treatment of coal chemical wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Fangqi Yang,Chang Jiang,Mingfeng Ma,Fenghao Shu,Xinyu Mao,Weikang Yu,Jun Wang,Zheling Zeng,Shuguang Deng
Electrochemical reduction of CO 2 into formic acid (HCOOH) is an appealing approach to mitigate the CO 2 emission problem and achieve a carbon-neutral cycle but remains a challenge. Herein, we present a novel strategy to prepare Cu nanoparticles embedded in carbon substrate (Cu NPs@C) as efficient CO 2 reduction reaction electrocatalysts for highly selective HCOOH production. The uniformly distributed Cu nanoparticles are responsible for the high faradaic efficiency of HCOOH of 78% at −1.0 V (RHE) and yield of 82.8 μmol h −1 cm −2 at −1.2 V (RHE). Moreover, the detailed density functional theory (DFT) calculations have demonstrated that the high activity and selectivity for HCOOH production was attributed to the synergy effects of exposed Cu (111) facets and carbon substrate. The charges transferred from Cu induces a charge-rich environment on the carbon surface, which enhances the *OCHO adsorption and boosts the HCOOH formation. This work paves a new way to synthesize novel Cu-based electrocatalysts for efficient production of HCOOH.
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