Molecular Systems Design & Engineering
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2021
·Vol. 6
·期 10
·825-831
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IF 4.935
Shaoqing Li,Wei Huang,Wei Tan,Lizhu Zhang,Yanli Zhang,Hongyu Shi,Motilal Mathesh,Colin J. Barrow,Wenrong Yang,Hongbin Wang
Functionalized gold nanoparticles (GNPs) have been extensively studied for cargo delivery and imaging towards biomedical applications. However, there are limited studies showcasing the above two in sync using GNPs. In this work, we fabricated a nanosystem for small molecule delivery and bioimaging based on L-cysteine (L-Cys)-functionalized GNPs (GNP–L-Cys) coupled with a rhodamine 6G derivative (Rh6G2). GNPs conjugated with Rh6G2 (GNP–L-Cys–Rh6G2), as a model system, showcased enhanced fluorescence emission due to “on-demand” release of the rhodamine dye (RGCOOH) from the surface of the GNPs through spiro ring-opening followed by an ion-catalyzed hydrolysis mechanism in the presence of Cu2+. Moreover, in vitro studies showed sustained release of RGCOOH into cells; thus, GNP–L-Cys–Rh6G2 acted as a delivery vehicle without causing significant cell toxicity and was further used for fluorescence imaging. We believe such nanoscale systems with molecular scale engineering open up new possibilities for biomedical applications.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2020
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IF 4.192
Chong Chen,Lin-Lin Yang,A-Ling Tang,Pei-Yi Wang,Rong Dong,Zhi-Bing Wu,Zhong Li,Song Yang
Salicylic acid (SA), a crucial, plant-derived signal molecule, is capable of launching global transcriptional reprogramming to assist plants in obtaining the systemic acquired resistance (SAR) mechanism. Thus, the accurate detection of SA will not only significantly contribute to the understanding of the plant SAR but also contribute to crop protection and to the security of the agricultural production and food supply. However, detection of SA using fluorescent probes is a great challenge for scientists, because SA analogues can significantly interfere with the detection results. Herein, we first reported using a simple, natural curcumin–Cu2+ ensemble to selectively and sensitively monitor SA in situ and in vivo, directed by a fluorescence “turn-on” mode. A binary combination curcumin–Cu2+ was first fabricated with a fluorescence “turn-off” pattern caused by the paramagnetic nature of Cu2+. Subsequently, a fluorescence “turn-on” response was performed for detecting SA accompanied by the formation of the ternary complex curcumin–Cu2+–SA due to the high affinity of SA toward Cu2+, which reduced the fluorescent impact caused by the paramagnetism of Cu2+. Further study revealed that the rationally designed hybrid probe could monitor SA in living cell lines. We anticipate that this finding can inspire the discovery of a high-performance SA probe.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Sihan Li,Yanqi Gan,Syed Jalil Shah,Ruimeng Wang,Wenxue Gong,Rule Wei,Hongbing Ji,Zhongxing Zhao,Zhenxia Zhao
Competitive adsorption of complex nonsteroidal anti-inflammatory drugs (NSAIDs) from wastewater often reduces the adsorption capacity of object pollutants on most porous materials. To address this issue, NSAIDs molecules were proposed for engineering imprinted pores in UiO-66s to boost their adsorption capacity towards diclofenac sodium (DCF) and Cu(II) in a complex solution. Naproxen (NAP) with proper chemical structure was proved to introduce more imprinted pores (at ~19 Å) with enhanced mesoporous volume, abundant unsaturated metal sites, and terminal hydroxyl groups in UiO-66@NAP. These new intriguing properties awarded high adsorption affinity to UiO-66@NAP for DCF and Cu(II), and their adsorption capacities reached up to 385 and 52 mg/g for single DCF and Cu(II) components, respectively. When DCF and Cu(II) simultaneously appeared in an aqueous solution, DCF was proved to preferentially occupy adsorption sites on UiO-66@NAP with higher adsorption kinetics compared to Cu(II). Afterwards, these pre-adsorbed DCF acted as new adsorption sites to bridge more Cu(II) in the solution. Similarly, the adsorbed Cu(II) on UiO-66@NAP had the same reciprocal bridging effect towards DCF, which realized the synergistic adsorption of DCF and Cu(II) over UiO-66@NAP. Notably, DCF was found to greatly boost the synergistic effect of the Cu(II) adsorption. As a result, UiO-66@NAP exhibited 1.5 and 2.6 times higher uptakes for DCF (573 mg/g) and Cu(II) (135 mg/g) in the binary system compared to their single pollutant system, and its equilibrium adsorption capacity was much higher compared to several state-of-the-art adsorbents. The current work set out a new strategy to modify MOFs for enhanced adsorption of complex NSAID contaminants and revealed a deep understanding of the interactions between NSAIDs and heavy metals ions .
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Journal of Environmental Sciences
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2019
·
IF 3.556
Qing Wu,Li He,Zhong Wei Jiang,Yang Li,Ting Ting Zhao,Yu Han Li,Cheng Zhi Huang,Yuan Fang Li
Efficient removal of non-biodegradable and hazardous dyes from wastewater remains a hot research topic. Herein, a rationally designed a Cu(II)-based metal–organic gel (Cu-MOG) with a nanoporous 3D network structure prepared via a simple one-step mixing method was successfully employed for the removal of cationic dyes. The Cu-MOG exhibited high efficiency, with an adsorption capacity of up to 650.32 mg/g, and rapid adsorption efficiency, with the ability to adsorb 80% of Neutral Red within 1 min. The high adsorption efficiency was attributed to its large specific surface area, which enabled it to massively bind cationic dyes through electrostatic interaction, and a nanoporous structure that promoted intra-pore diffusion. Remarkably, the Cu-MOG displayed size-selective adsorption, based on adsorption studies concerning dyes of different sizes as calculated by density functional theory . Additionally, the adsorption performance of the Cu-MOG still maintained removal efficiency of 100% after three regeneration cycles. These results suggested that the Cu-MOG could be expected to be a promising and competitive candidate to conveniently process wastewater.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Mingxia Jiao,Yun Li,Yuxiu Jia,Zhen Yang,Xiliang Luo
Non-cadimum photoluminescent I−III−VI semiconductor nanocrystals have attracted increasing attention due to their low toxicity, extraordinary optical and electronic properties. Herein, water-soluble quaternary Cu-In-Zn-S quantum dots (CIZS QDs) with tunable emission from 535 nm to 645 nm were successfully synthesized via ecofriendly one-pot aqueous method. The full width at half-maximum (FWHM) of the emissions are about 68 nm–88 nm, which are rather narrow among Cu-based semiconductors and preferred to facilitate improving color purity. The photoluminescence of water-soluble QDs was enhanced by ZnS coating with the absolute quantum yield (QY) up to 30.8%. Further, a novel fluorescent sensor for Cu 2+ detection was developed based on the alteration of intrinsic optical properties of the CIZS/ZnS QDs after cation exchange at room temperature within 10 min, presenting a linear range of 0.020–20 μM and a detection limit down to 6.7 nM. Mechanism studies revealed that the QDs served as the template for cation exchange, through UV–vis absorption and fluorescence spectra in combination with the chemical composition and time-resolved photoluminescence decay analysis. Ions interference experiments demonstrated the good selectivity of the QDs towards Cu 2+ and the sensor showed comparable accuracy to ICP-AES method as well as good performance in real sample detection, manifesting the reliability of the current strategy for sensing Cu 2+ mildly and rapidly.
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JOURNAL OF HAZARDOUS MATERIALS
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2018
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IF 6.434
Ying Liu,Yong Feng,Yunfei Zhang,Shun Mao,Deli Wu,Huaqiang Chu
In this study, the presence of Cu(II) ions was found for the first time to severely inhibit +-dimethyl phthalate (DMP) degradation by ozone due to the formation of the stable complex Cu(II)-DMP. However, 100% DMP removal was rapidly reached when ethylenediamine tetraacetic acid (EDTA) was added with a Cu(II)/EDTA molar ratio of 3:1. Subsequent studies indicated that Cu(II)-DMP is sequestrated by EDTA, then DMP was degraded and Cu(II) was removed by precipitation. The freshly formed Cu-EDTA 2− and organic nitrogen intermediates further decomposed O 3 into OH, which induced to the rapid degradation of DMP. The k obs of Cu-EDTA/O 3 were 9–10 times greater than the k obs of DMP removed by ozonation alone within 10 min. The reaction mechanism involved a OH generation was proposed. The OH and O 2 - are generated from the rapid reaction between ozone and EDTA. Acting as a more strongly negative species, the specific Cu(II) in Cu-EDTA complexes is more inclined to react with O 2 - to give Cu(I), accelerating the forward reaction to produce more OH. The synergistic removal of DMP and Cu(II) can be achieved after reaction. Therefore, this study provides an effective method to dispose metal ion and organic pollutant wastewater.
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CHEMICAL ENGINEERING JOURNAL
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2015
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IF 4.321
Sheng Deng,Guangshan Zhang,Xi Wang,Tong Zheng,Peng Wang
Polyacrylonitrile fiber immobilized with iminodiacetic acid (IDA) was prepared under microwave irradiation and was used to adsorb Cu(II) and Hg(II) in aqueous solution. Synthesis conditions such as time, temperature and ratio of solvents were exploited systematically by orthogonal experiment and the properties of this fibrous absorbent were characterized by fourier transform infrared spectroscopy (FT-IR), elemental analysis (EA), scanning electron microscopy (SEM). The adsorption performances, in both thermodynamic and kinetic conditions, were investigated strictly and the experimental data fitted the Langmuir model ( R 2 > 0.99) and pseudo-second-order equation very well. The effect of pH on the adsorption capacity of metal ions was discussed and the optimal value for Cu(II) and Hg(II) was found to be 5.0 and 2.0, respectively. Thermodynamic parameters reveal the spontaneous and endothermic nature of the adsorption process , due to the negative value of standard free energy (Δ G ) and the positive value of standard enthalpy (Δ H ). The adsorption capacities toward Cu(II) and Hg(II) on the modified polyacrylonitrile fibers under microwave irradiation are higher than those on other adsorbents through conventional heating. The less consumed time and high grafting rate of the functional groups may be attributed to thermal effect as well as non-thermal effect of microwave irradiation.
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ANALYTICAL BIOCHEMISTRY
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2015
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IF 2.219
Fang Wang,Wencheng Gong,Lili Wang,Zilin Chen
Selective recognition of d -tryptophan ( d -Trp) in the presence of Cu(II) was investigated at poly- l -lysine (p-l-Lys) film using electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV). p-l-Lys film was immobilized on a glassy carbon electrode (GCE) by cyclic voltammetry between 0.0 and 1.9 V in 20 mM phosphate buffer solution (pH 8.6). After the p-l-Lys/GCE electrode was incubated with d -Trp solution containing Cu(II) ions, obvious enhancement of electron transfer resistance and decrease of voltammetric current could be observed. If d -Trp was replaced by l -tryptophan (l-Trp), there was no apparent resistance and current changes. Moreover, no resistance and current changes could be found in the absence of Cu(II). It may be due to the formation of Cu complex with l -lysine and d -tryptophan. Finally, this method was successfully applied to monitoring enantiomeric composition of the d -Trp and l-Trp mixtures.
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CHEMICAL ENGINEERING JOURNAL
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2014
·
IF 4.058
Qiang Wang,Wei Gao,Yang Liu,Jiwen Yuan,Zhijun Xu,Qingfu Zeng,Yuguang Li,Martin Schröder
A novel silica gel based absorbent SG-H 2 L 1 , capable of simultaneous adsorption of cations and anions from aqueous solution, was prepared by immobilization of a ditopic zwitterionic Schiff base ligand H 2 L 1 onto a modified silica gel. The functionalized silica gels were characterized by Fourier transform infrared spectroscopy , elemental analysis, thermogravimetric analysis and porous structure analysis. The results showed a degree of functionalization of 0.32 mmol H 2 L 1 per gram of SG-H 2 L 1 . The effect of pH, contact time and initial Cu(II) and SO 4 2− concentration parameters on the simultaneous adsorption of Cu(II) and SO 4 2− ions were investigated. The adsorption was fast and the effective pH range for simultaneous adsorption of Cu(II) and SO 4 2− was neutral region. The adsorption study showed that SG-H 2 L 1 had good adsorption efficiency for Cu(II) and SO 4 2− , and the maximum adsorption capacity for Cu(II) and SO 4 2− , respectively, was the same of 0.65 mmol g −1 at 25 °C. Langmuir and Freundlich isotherm models were employed to analyze the experimental data, and the Langmuir model fitted better for both Cu(II) and SO 4 2− . Due to the zwitterionic feature, desorption and regeneration of the absorbent was readily realized by adjusting the pH of the regenerating media with diluted H 2 SO 4 (0.5 mol L −1 ) and ammonia solution (pH = 10), respectively. The new type absorbent SG-H 2 L 1 exhibited good recyclability and reusability for 5 cycles use without deterioration in its functionality. Therefore, the adsorbent can be used effectively for efficient and simultaneous adsorption of Cu(II) and SO 4 2− from waste water. The mechanism for simultaneous adsorption of cation and anions on SG-H 2 L 1 was also discussed. This study provides a strategy for the development of new absorbents for simultaneous adsorption of hazardous metal ions and anions from waste water effluents .
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2017
·
IF 3.743
Xiaofeng Yi,Jiarui He,Yingyuan Guo,Zhenhua Han,Meixia Yang,Jiali Jin,Junjie Gu,Minrui Ou,Xiaoping Xu
The aim of this work was to study the removal of Cu (II) and U (VI) ions from aqueous solutions by encapsulating magnetic Fe 3 O 4 nanoparticles into calcium alginate coated chitosan hydrochloride (CCM) hydrogel beads. ATR-FTIR and XRD analysis data indicated that the CCM composites were successfully prepared. SEM images and EDX spectra showed that Cu 2+ and UO 2 2+ ions were adhered onto sorbents . Adsorption properties for removal of both copper and uranium ions under various experimental conditions were investigated. Kinetic data and sorption equilibrium isotherms were also conducted in batch process . The sorption kinetic analysis revealed that sorption of Cu (II) and U (VI) followed the pseudo-second-order model well and exhibited 3-stage intraparticle diffusion model during the whole sorption process. Equilibrium data were best described by Langmuir model, and the CCM composite hydrogel beads showed the estimated maximum adsorption capacity 143.276 mg/g and 392.692 mg/g for Cu (II) and U (VI), respectively. The CCM adsorbent exhibited excellent reusability for five cycles use without significant changes in the adsorption capacity and structural stability. The results demonstrated that CCM can be an effective and promising sorbent for Cu (II) and U (VI) ions in wastewater.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
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IF 3.012
Yinxiu Zuo,Jingkun Xu,Fengxing Jiang,Xuemin Duan,Limin Lu,Guo Ye,Changcun Li,Yongfang Yu
Gold nanoparticles (AuNPs) dotted S-doped carbon (AuNPs/S-C) nanoflakes were synthesized via a facial and simple approach. Typical synthesis route involves the formation of gold nanoparticles/poly(3,4-ethylenedioxythiophene) (AuNPs/PEDOT) and a subsequent calcination process. Many techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) were used to characterize their morphology, structures and compositions . Results indicated that AuNPs with an average size of 5 nm were uniformly dotted on/into the S-C nanoflakes. The AuNPs/S-C/nafion was utilized as a new electrode material for simultaneously electrochemical determination of Cu (II) and Hg (II) using differential pulse anodic stripping voltammetry (DPASV) technique. Benefiting from the efficient metal-complexing ability and electrocatalytic activity of S-C and the good conductivity of AuNPs, the modified electrode exhibited enhanced electrochemical performance compared with bare glassy carbon electrode. Under optimal conditions, the peak currents displayed linear response to the concentrations of Cu (II) and Hg (II) ranges from 0.64 to 63.55 μg/L and 4.01 to 300.89 μg/L, with detection limits of 0.19 μg/L and 1.40 μg/L (S/N = 3), respectively. The modified electrode was also applied for the determination of Cu (II) and Hg (II) in lake water samples with good results.
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HYDROMETALLURGY
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2017
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IF 2.605
Tianlin Zhang,Xiadan Yue,Keren Zhang,Fei Zhao,Yulu Wang,Kun Zhang
Novel copper (II) ion imprinted polymers (Cu(II)-IIPs) were designed and synthesized as solid phase absorbents for the selective deep removal of Cu 2 + from concentrated zinc sulfate solution. Salicylaldoximes, used as chelating ligands, were anchored onto the polymer networks through quaternary ammonium cation spacers. The effect of pH, temperature, contact time, and swelling on the adsorption selectivity and the copper removal efficiency of Cu(II)-IIPs were investigated in a laboratory-scale cell. The results showed that the adsorption of Cu 2 + increased significantly with increasing pH from 1 to 7, and increased with decreasing operation temperature. The equilibrium Cu 2 + adsorption capacity of Cu(II)-IIPs from the zinc sulfate aqueous solution was 96 mg·g − 1 at 25 °C in pH 5.0 for 10 min. Under optimized processing conditions, the copper removal efficiency reached 99.9%, and the concentration of the residual copper (II) ions in the purified ZnSO 4 aqueous solution is 35 μg·L − 1 , significant lower than the maximum acceptable value as 100 μg·L − 1 in the hydrometallurgical zinc process.
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