MICROCHEMICAL JOURNAL
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2023
·
IF 4.8
Zanling Huang,Shuqi Zhu,Abebe Reda Woldu,Wenhua Gao,Jing-Xin Jian,Paul K. Chu,Qing-Xiao Tong,Liangsheng Hu
Electrochemical glucose detection co-catalyzed by bimetallic ions is carried out by introducing Co(II) and Cu(II) into the alkaline solution. The technique avoids the complicated electrode design and catalyst poisoning. By using nitrogen-doped carbon nanotubes (NCNT) loaded on carbon cloth (CC) as the working electrode, the bimetal co-catalytic system achieves a sensitivity of 6,909 mA M −1 cm −2 , a detection limit of 0.4 μM (S/N = 3), as well as good selectivity and stability. By performing systematic electrochemical and structural analysis, the mechanism of Co(II) and Cu(II) co-catalysis for glucose detection in the solution is elucidated. Co(II) supplies the dynamic reaction sites and source of active intermediate (CoOOH), while Cu(II) promotes the formation of CoOOH. The results provide mechanistic insights into bimetal co-catalysis of glucose detection and other electrochemical reactions .
研究领域:
电化学
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材料科学
·
分析化学
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DOI
高影响因子
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.
研究领域:
环境科学
·
化学
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xiaohui Liu,Yitao Liu,Jia Wei,Yuhan Zhu,Yifei Zhang,Luyi Xing,Jun Li
Recently, the use of biochar for wastewater treatment has become a central focus in environmental remediation studies. In this research, a simple and economical one-pot hydrothermal strategy was developed for the synthesis of iron-modified sludge-derived hydrothermal biochar (ISHB). The obtained optimum ISHB possesses abundant hydroxy, carboxyl and aromatic ring surface functional groups as well as relative high surface area and small particle size which contribute to the adsorption of the enhanced contaminants. The structure-activity relationship and the adsorption behavior between the ISHB and doxycycline (DOX) were explored. The loaded iron improved the adsorption capacity of ISHB from 51.65 to 78.93 mg g –1 at 20°C with an initial DOX concentration of 60 mg L –1 . As Cu(II) exists in the DOX solution, the adsorption of DOX is inhibited to 50.06 mg g –1 due to the site competition between DOX and Cu(II). Nevertheless, the adsorption of Cu(II) is promoted, which can be explained by the complexation between DOX and Cu(II).
研究领域:
环境科学
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化学工程
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水体修复
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吸附技术
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材料科学
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 96
·79022-79030
·
IF 3.84
Lei Xu,Xiaoqiong Lu,Xiaomin Cheng
A series of novel cotton cellulose-graft-polycaprolactone copolymers with different grafting contents were successfully prepared via ring-opening polymerization (ROP) in an ionic liquid 1-N-butyl-3-methylimidazolium chloride ([Bmim]Cl). The structures of the grafting copolymers were systematically characterized by FTIR, CP/MAS13C-NMR, XRD, SEM and AFM, while thermal properties were investigated by DSC and TGA. Subsequently, Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich (D–R) adsorption isotherms were representative to simulate adsorption isotherms of Cu(II) and Ni(II) ions in aqueous solution. From the comparison of different adsorption isotherm models, it was found that adsorption of Cu(II) by modified cellulose followed Langmuir, Freundlich and Temkin models, while that of Ni(II) followed the Freundlich model. The results of adsorption indicated that the selectivity sequence of metal ions on graft copolymers was Cu(II) > Ni(II) and the maximum removal capacities of Cu(II) and Ni(II) ions were 98.7% and 35.6%, respectively. Hence, the graft copolymers exhibited significant potential to be an environmentally feasible biosorbent for removal of Cu(II) and Ni(II) ions from aqueous solution.
研究领域:
环境科学
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高分子化学
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材料科学
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重金属去除
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吸附技术
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高影响因子
Science China-Chemistry
·
2023
·Vol. 66
·期 3
·853-862
·
IF 9.6
Yang Lei,Liu Zenghe,Neisiany Rasoul Esmaeely,Lou Jiaming,Guo Yifan,Zhang Luzhi,Liu Huijie,Chen Shuo,Gu Shijia,You Zhengwei
It is exceedingly desired, but difficult to construct self-healing materials with both excellent mechanical properties and healing efficiency, which are usually realized by using mutually exclusive methods. Here, we reconcile this contradiction by utilizing copper-bis-(imidazole-2-yl)-methane-urea (Cu-BIMU) locked units based on novel designed dynamic imidazole-urea bonds with coupled multiple noncovalent bonds (coordination bonds, π − π stacking bonds, and hydrogen bonds). The coordination of Cu(II) greatly reduces the electron-cloud density of imidazole, which lowers the free energy barrier of imidazole-urea bonds and promotes their reversible dissociation, as demonstrated by the density functional theory and small-molecule model reaction. The topological design of Cu-BIMU polyurethane (Cu-BIMU-PU), which concentrates multiple crosslinking-in-one locked unit to avoid the formation of excessive crosslinking sites to ensure high chain mobility, facilitates self-healing. Accumulative extensive intermolecular interactions endowed excellent mechanical properties to the resulting Cu-BIMU-PU elastomer with a tensile strength of 65.3 MPa, among the highest ever-reported value. This work provides a novel molecular design principle for fabricating high-performance dynamic polymers.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wei Yang,Mingli Cao
The removal of heavy metal ions from the aqueous environment is an important topic as heavy metal pollution is widely distributed in water bodies, causing serious damage to aquatic ecosystems and worsening the already scarce freshwater resources. In this work, we report the synthesis of novel ZIF-8@GO-COOH composite nanosorbent materials by in situ self-assembly. The physicochemical properties of the composites were investigated using relevant characterisation techniques, and the adsorption capacity of ZIF-8@GO-COOH for copper and lead ions in aqueous solution was tested by batch adsorption experiments. The adsorption behaviour was analysed by combining adsorption kinetics, adsorption isotherm model and Van't Hoff model. The results showed that the adsorption capacities of ZIF-8@GO-COOH for Cu(II) and Pb(II) were 93.26 mg/g and 95.875 mg/g, respectively, when the initial heavy metal ion concentration was 100 mg/L, the adsorption time was 60 min, the temperature was 293 K and the pH conditions were suitable. The high adsorption performance of ZIF-8@GO-COOH was attributed to its surface with abundant oxygen-containing functional groups and excellent specific surface area, which gives it a significant advantage in the removal of heavy metal ions from aqueous solutions.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Liuting Mo,Shifeng Zhang,Fei Qi,Anmin Huang
Water pollution by heavy metal ions is a global concern due to detrimental effects on the ecological environment and human health. To solve the problem of the stability and recyclability of the traditional adsorbents, we proposed three-dimensional lamellar porous cellulose nanofiber/polyacrylamide composite aerogel with outstanding pollutants adsorption, easy regeneration, and multiple recycling. The aerogel adsorbent was prepared by a two-step method via facile in-situ physical/chemical double cross-linking and freeze-drying processes. The resulting aerogels showed good thermal stability , superior water stability and excellent adsorption properties, with a maximum Langmuir adsorption capacity for Cu(II) ions up to 240 mg g −1 due to the in-situ physical/chemical combination of anionic polyacrylamide and carbonylated cellulose nanofibers. The adsorption mechanism was the electrostatic attraction, chelating effect and complex formation driving forces for the fast and efficient adsorption of Cu(II) ions. The removal efficiency of the aerogels for Cu(II) remained above 80% after 10 adsorption/regeneration cycles, suggesting its outstanding recyclability. The proposed aerogel adsorbent shows noteworthy potential for the practical treatment of heavy metal ion wastewater.
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DOI
PubMed
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Pan Pan,Mingming Li,Yuxin Liu,Yisi Feng,Xinglong Li
2,5-diformylfuran (DFF) is a multifunctional intermediate, which can be used in drugs, functional polymers, fluorescent materials and surfactants. In this paper, a TEMPO-assisted magnetic Fe 3 O 4 @SiO 2 @mSiO 2 -NH 2 -Cu(II) catalytic system was developed for the selective oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran. The structure of Fe 3 O 4 @SiO 2 @mSiO 2 -NH 2 -Cu(II) was double-layer shell-core spherical structure with uniform ordered mesoporous on the surface, amino groups and Cu were evenly distributed in the outer mesoporous. The catalyst was characterized by FT-IR, TEM, EDS, SEM, XRD, BET and VSM. The effects of reaction conditions were investigated in detail. The conversion of HMF was 98.9% and the highest DFF yield was 92.4% under atmospheric oxygen in toluene solvent. The catalytic activity did not decrease significantly after 5 cycles. The catalytic system had good substrate adaptability for benzyl alcohols and aromatic alcohols with satisfactory yield of corresponding aldehydes (91.3–100%). A possible reaction mechanism was also proposed and found that bis(μ-hydroxy) double copper (II) may be the active reactant in oxidation reaction. The system provides a promising industrialized preparation method for DFF.
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DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2022
·Vol. 36
·期 10
·e6833
·
IF 4.072
Jing Hu,Yun Luo,Min Hou,Jia Jia Qi,Li Li Liang,Wen Ge Li
Two dinuclear complexes [Cu 2 (LO) 2 ] and [Ni 2 L 2 Cl 2 (C 2 H 5 OH) 2 ] derived from (5-chlorosalicylaldehyde)-4-aminoantipyrine (HL) were synthesized and characterized by infrared (IR) spectroscopy，thermogravimetric analysis, and powder X-ray diffraction. Molecular structures of the Cu (II) and Ni (II) complexes were determined by single-crystal X-ray diffraction. Their cytotoxicity was evaluated by methyl thiazolyl tetrazolium assay against human tumor cells, such as lung carcinoma A549, lung adenocarcinoma H1975, breast carcinoma MDA-MB-231, and nasopharyngeal carcinoma CNE-2Z cell lines. The results showed that the Cu (II) complex had much better anticancer activity than the Ni (II) complex, especially for MDA-MB-231 and CNE-2Z cells. The reason may be that they have different structures. The methyl group on the (5-chlorosalicylaldehyde)-4-aminoantipyrine (HL) was oxidized to the hydroxymethyl group, herein, namely LO, which is difficult to achieve in the normal chemical synthesis process. However, we did it by a solvothermal method at low temperature. It provides a new way of thinking and synthesis. The anticancer activity of the copper complex was next only to cisplatin, and the copper complex was nontoxic for the human normal cell lines. The experiment results also showed that the copper complex could inhibit tumor cell proliferation through the cell cycle and cell apoptosis.
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DOI
高影响因子
TALANTA
·
2021
·
IF 6.057
Rongrong Wang,Yong Cao,Hao Qu,Yanbo Wang,Lei Zheng
Copper sulfate is a widely used agent to control insects, bacteria and algae for fishery. However, excess amount of copper ions in water accumulate in aquatic products through the ecological cycle system, highly threatening food safety and public health. Therefore, it is urgent to develop a rapid and efficient method for the determination of copper content in aquatic products. In this study, we developed a label-free biosensor for Cu(II) based on a graphene field-effect transistor gated by structure-switching aptamer probes (SSA-GFET) against Cu(II) we obtained before. The detection mechanism of the biosensor is attributed to the surface charge shift and the potential change of the gate electrode upon the specific binding of Cu(II). The SSA-GFET biosensor has a low detection limit of 10 nM and a linear range of 10 nM to 3 μM to Cu(II). In addition to the excellent selectivity to Cu(II), the biosensor also showes the advantage of high recovery rate for detection of Cu(II) in real fish samples. Because of the detection characteristics of label-free SSA-GFET, it has great advantages in the field of food safety and environmental detection.
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DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Wei Zhang,Ping Sun,Desheng Liu,Quanlin Zhao,Binze Zou,Lincheng Zhou,Zhengfang Ye
Herein, a simple and green method to fabricate β-cyclodextrin (β-CD) porous cross-linked polymer modified poly(chloromethylstyrene) (PS-Cl) resin, namely, PS@CM-CDP, for ultrafast and efficient removal of heavy metal ions and organic pollutants from aqueous solution was reported. The selected (PS-Cl) was used as a matrix; meanwhile, the β-CD was formed on the surface of PS-Cl under a rigid cross-linking agent of tetrafluoroterephthalonitrile nitrile. The structure and surface elements distribution of PS@CM-CDP were characterized using FT-IR, TG, SEM, XPS, and BET. The resultant PS@CM-CDP with a relatively high maximum adsorption capacity for Cu(II) and BPA can reach 121.88 and 8.25 mg g −1 , respectively, and the spherical nature of the resin makes conventional β-CD polymers easy to recycle 6 times without significantly decreased. The possible adsorption mechanism was also proposed. Industrial wastewater adsorption methods have been used into practice, and the practice presents considerable prospects in the aspects of column for water treatment.
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Materials
·
2020
·Vol. 13
·期 9
·2033
·
IF 3.057
Yongzhen Lei,Long Mao,Jin Yao,Zhihan Li
Poly(lactic acid) (PLA) represents one of the most promising and attractive bio-based polymers for green packaging. However, toughness, gas barrier and antibacterial properties of pure PLA films cannot compete with those of traditional petroleum-based active packaging plastics. To fill this gap, utilization of excellent chelating properties of phytic acid (PA), functionalized layered double hydroxides (LDHs@PA-Cu(II)) was firstly synthetized via facile deposition and chelation of one-step assembled PA-Cu(II) coordination compounds on the surface of layered clay. Furthermore, LDHs@PA-Cu(II)/PLA nanocomposites were prepared by blending LDHs@PA-Cu(II) and pure PLA via solution casting evaporation process. After adding only 1 wt % LDHs@PA-Cu(II), elongation at break and tensile strength increase by 53.0% and 18.9%, respectively, and the oxygen relative permeability decreases by 28.0%. Due to the strong interface interaction and heterogenous nucleation, the reinforcement effect of LDHs@PA-Cu(II) at low loadings is remarkable. Meanwhile, owing to the antibacterial activity of PA-Cu(II) coatings, the antibacterial rate (against Escherichia coli) of LDHs@PA-Cu(II) exceeds 99.99%. Furthermore, the corresponding LDHs@PA-Cu(II)/PLA nanocomposites also show outstanding antibacterial properties, which will be a promising candidate for active packaging application.Keywords:layered double hydroxides;phytic acid;antibacterial activity;polylactic acid;barrier properties
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