SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Yuefei Zhang,Haibing Wang,Ningjie Sun,Ruan Chi
The mechanism of adsorption of dichromate by imidazole ionic liquid-bonded silica gel was studied. Two different adsorbents for adsorption of dichromate ions were synthesized and characterized. By static adsorption experiments, when the pH was 5.6 and the initial concentration of Cr was 200 μg/mL, the adsorption capacity of 1-methylimidazole ionic liquid-bonded silica gel (SilprMmimCl) and 1-ethylimidazole ionic liquid-bonded silica gel (SilprEmimCl) for Cr (VI) was 24.03 mg/g and 16.52 mg/g, respectively. To investigate the mechanism of adsorption on molecular scale, an simplified model of SilprMmimCl and SilprEmimCl have been modeled with [Mmim]Cl, [Emim]Cl, [Mmim][Cr 2 O 7 ] and [Emim][Cr 2 O 7 ]. The structures of related models were optimized at the B3LYP/6-311+G(d, p) level. The weak interaction between cations and anions of models was analyzed by vibration analysis and bond length analysis; the features of bonds at bond critical points and the variations of bond types was studied by Atoms In Molecules (AIM) theory. Simultaneously, noncovalent interactions were characterized and visualized by analysis of Reduced Density Gradient (RDG). Finally, The sequence of intra-molecular interaction energy is [Mmim][Cr 2 O 7 ], [Emim][Cr 2 O 7 ], [Mmim]Cl, [Emim]Cl from big to small, which demonstrates why SilprMmimCl and SilprEmimCl have a good adsorption capacity for dichromate and the adsorption capacity of SilprMmimCl is slightly more than that of SilprEmimCl.
研究领域:
环境科学
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计算化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Xiaoqing Guo,Shuangju Song,Xue Wang,Xue Jiang,Wenqing Lv,Xiaoya Yu,Yuanyuan Han,Liyong Wang
A novel inorganic dual-functional fluorescent chemosensors CaMoO 4 :Eu 3+ has been prepared via solid-state reaction by the assistance of gum arabic (GA). The fluorescence of as-prepared CMO:Eu 3+ was selectively quenched by Fe 3+ and Cr 2 O 7 2− ions in aqueous, resulting in the simultaneous detection of Fe 3+ and Cr 2 O 7 2− ions. The F − anions can recover the fluorescence when Fe 3+ quenching the fluorescence at 615 nm. Moreover, CMO:Eu 3+ displayed high sensitivity for Fe 3+ and Cr 2 O 7 2− assay and the detection limits were 8.26 and 4.78 μM, respectively. The fluorescence quenching mechanism was ascribed to the competitive adsorption between CMO:Eu 3+ and targets. Results indicated that CMO:Eu 3+ could be a promising candidate in Fe 3+ and Cr 2 O 7 2− ions assay in environmental systems.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2018
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IF 4.61
Wuhui Luo,Jiping Ouyang,Philip Antwi,Meng Wu,Zhiqiang Huang,Weiwei Qin
Butane-1,4-bis(dodecyl dimethyl ammonium bromide) (gBDDA) and dodecyl trimethyl ammonium bromide (DTMA) in same stoichiometric amounts were applied to modify montmorillonite (Mt) under microwave and ultrasound conditions. The composition and structure of products were obtained through multiple characterizations including XRD, FTIR , TG/DTG, SEM, TEM , and N 2 adsorption/desorption measurements, and the adsorption performance of chromate and phenol on these products were also investigated. Intercalations of gBDDA and DTMA into interlayer space of Mt were observed, but the amount of anchored modifier on the external surface was larger for gBDDA compared with DTMA when the stoichiometric amount of modifier larger than 1.0 times cation exchange capacity of Mt was added. Although there was no significant difference in morphology among products, the interlayer space distance, specific surface area, and pore size distribution were closely associated with the species and amount of applied modifier. Adsorption of phenol on products through partition mechanism relied on not only organic content, but also the configuration of modifier. Meanwhile, adsorption of chromate mainly depended on the presence of counter ion (bromide), which accounted for the high adsorption capacity and initial adsorption rate on gOMt-0.75. The fitting parameters of adsorption results using pseudo-second order model and Freundlich model suggested that gBDDA-modified Mt could sequester phenol or chromate in the faster manner with higher affinity. Compared with the conventional surfactant such as DTMA, the study revealed that, using gemini surfactant such as gBDDA to modify Mt would significantly reduce or even has the potential to eradicate the secondary pollution by modifier release during adsorption process. This study provides a new direction for Mt modification intended to be used as adsorbents to treat polluted water with high standards such as drinking water .
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 6
·4006-4013
·
IF 1.354
Peng Yinjie,Tang Donglin,Wang Qiao,He Ting,Chu Yineng,Li Ruihai
In this paper, multiwall carbon nanotubes (MWCNTs) were modified by Polyethylenimine of different molecular weight of 1800 (MWCNTs-18) and 7000 (MWCNTs-70). The structure and morphology of the functionalized MWCNTs were characterized by thermogravimetric analysis (TGA), X-ray powder
diffraction (XRD) and scanning electron microscopy (SEM). The curve of TGA showed that the mass loss of MWCNTs-18 and MWCNTs-70 were 46.5% and 51.9% respectively, which was remarkably different with pristine MWCNTs. The XRD demonstrated that the structure of the pristine MWCNTs and functionalized
MWCNTs were similar. In addition, the experiment of the removal of chromate from water solution using functionalized MWCNTs was also conducted. The experimental conditions such as concentration of chromate, temperature, pH were studied. The maximum uptake capacities for chromate anions were
obtained at the concentration of 0.4 mmol·L−1. The solution pH showed a significant effect on chromate removal over a pH range from 4.0 to 9.0. Besides, the uptake capacities for chromate anions on MWCNTs-18 and MWCNTs-70 increased as the temperature increase within
the range from 30 to 60 °C. Under the experimental conditions, the maximum uptake capacities of MWCNTs-18 and MWCNTs-70 for chromate anions were 0.27 and 0.33 mmol·g−1 respectively. The thermodynamic parameters of the uptake process were calculated, and the results
showed that the process of uptake chromate was spontaneous.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2015
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IF 4.321
Chitam Ha,Nengwu Zhu,Ru Shang,Chaohong Shi,Jiaying Cui,Ihsanullah Sohoo,Pingxiao Wu,Yanlan Cao
Precious metal Palladium (Pd) is a scarce natural resource with increasing industrial demand. The use of microorganisms for biorecovery of Pd is a promising approach because it mimics natural biogeochemical cycles. In this study, we investigated the biorecovery of Pd 0 nanoparticles (Pd 0 -NPs) by Enterococcus faecalis ( E. faecalis ) with sodium formate as electron donor. X-ray diffraction analyses exhibited that the process could successfully reduce Pd 2+ and generate Pd 0 -NPs. Transmission electron microscope observation showed that the Pd 0 -NPs were associated at the membrane and inside of the cell. Under the optimum conditions of temperature (40 °C), sodium formate concentration (25 mM), biomass (1.2 g L −1 ), and 210 mg L −1 Pd 2+ (pH 3.0–3.5) were completely reduced within 48 h. The percentage of the Pd 0 -NPs with an average size lower than 10 nm increased from 91.5% to 99.6% as the biomass increased from 1.2 to 3.6 g L −1 , respectively. The catalytic property of the Pd 0 -NPs treated by ultrasonication was higher than chemically prepared Pd 0 . It showed that 6.3 mg Pd 0 -NPs could catalyze the complete reduction of 5.0 μmol Cr 6+ in 12 h. All of these findings suggest that it is potentially feasible to recover Pd 0 -NPs with catalytic activity from industrial wastes using E. faecalis .
研究领域:
微生物学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Shu-Na Liu,Han-Ni Wang,Min-Liang Feng,Kai-Ling Yang,Songliang Cai,Jun Fan,Wei-Guang Zhang,Sheng-Run Zheng
The covalent linking of metal–organic cages (MOCs) with a nanoscale cavity is an efficient strategy to construct functional materials with different properties compared with bulk MOCs, but studies based on this topic are still less explored. In addition, toxic chemical and pollutant uptake, especially iodine vapor adsorption on MOC-based materials, still lacks investigation. Herein, an MOC-extended amorphous network (denoted MOC–DASD) via the covalent linking of an aldehyde-functionalized cationic Pd12L24 MOC (with about 3.5 nm in diameter) with an anionic organic linker, 4,4′-diamino-2,2′-stilbenedisulfonic acid (DASD), was constructed and applied to absorb Cr2O72– in water and capture I2 molecules in vapor. The covalent linkage of MOC and DASD via C═N bonds was confirmed by IR, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and ζ-potential tests. In addition, the original NO3– anions can be easily removed from the MOC–DASD due to the introduction of an anionic linker, thus releasing more effective cavities for guest adsorption. Although there is a lack of exchangeable anions, MOC–DASD still exhibits the ability to capture Cr2O72– in water with moderate capacity and high selectivity. In addition, the MOC–DASD showed a significantly enhanced iodine vapor uptake capacity. The iodine uptake capacity of MOC–DASD reached 3.67 g/g, which is 1.8 times higher than that of bulk MOC. A mechanistic study shows that some of the iodine was closely adsorbed by charge transfer. The release of iodine at 120 °C reveals that approximately 74% of the absorbed iodine can be removed, and the MOC can uptake the iodine again with a capacity of 1.5 g/g, showing good reusability.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhaochuan Yu,Chao Deng,Shan Jiang,Yuqian Liu,Chao Liu,Farzad Seidi,Xing Zhang,Yang Huang,Weibing Wu,Jingquan Han,Qiang Yong,Huining Xiao
Dichromate ion (Cr 2 O 7 2− ) is a highly toxic chromium-containing compound that poses significant hazards to the digestive, respiratory systems, skin, and mucous membranes. Currently, the detection and adsorption of Cr 2 O 7 2− face significant challenges, including the time-consuming and low sensitivity nature of traditional analytical methods. The limited efficiency and capacity of existing adsorbents hinder their practical application in real-time water quality monitoring and environmental remediation. Herein, using polyethyleneimine-functionalized (PEI) pulp fiber paper as the substrate, we developed smart paper-based materials (designated as NB-MQDs@PP) incorporated with nitrogen and boron co-doped MXene quantum dots (NB-MQDs) for rapid adsorption and sensitive detection of Cr 2 O 7 2− . Compared to undoped MQDs, NB-MQDs exhibited longer excitation wavelength and enhanced oxidation stability. As anticipated, NB-MQDs achieved rapid (response time of 10 s) and sensitive (detection limit of 1.2 μM) recognition of Cr 2 O 7 2− within a wide pH range with a quenching efficiency of 99.9%. Simultaneously, two on-site detection methods, immersion and cyclic filtration, were constructed based on NB-MQDs@PP. The detection limit of the immersion method was 17.0 nM, while the cyclic filtration method had a detection limit as low as 3.8 nM, surpassing the majority of those reported literatures. Remarkably, NB-MQDs@PP exhibited outstanding enrichment capacity towards Cr 2 O 7 2− , with an adsorption capacity of up to 162.4 mg/g. This work provides a novel strategy for creating unique paper-based materials with excellent capture and monitoring dual-function, which can be customized according to the requirements of various application scenarios.
研究领域:
环境科学
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材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Kuan-Neng Chi,Yan Guan,Xi Zhang,Tong Yang,Shuang Meng,Rong Hu,Yun-Hui Yang
The analytical methods based on colorimetric detection of various analytes have attracted intensive interest. However, most of them display relatively low sensitivity. Herein, a novel colorimetric strategy based on iodide/metal-organic frameworks (MOF)-mediated amplification was developed for low-cost, naked-eye detection and quantification of H 2 O 2 ,Cr 2 O 7 2− , and H 2 S. Cu-MOFs could catalyze the oxidation of the colorless peroxidase substrate TMB to produce a blue product. The published researches mainly focused on the immobilization or integration of a macromolecule , such as natural enzymes , to enhance MOFs catalytic abilities. The use of small molecules to improve the catalytic performance of MOFs has rarely reported. Due to the negligible steric hindrance , iodide could easily be adsorbed in the framework pore of MOFs to conduct the synergic catalytic effect, and shows a high catalytic effect. As a result, the catalytic activity of Cu-MOFs was dramatically enhanced, and thus, the nanocatalyst could act as an amplifier system for target detection. The detection limits obtained by the amplified method are 25, 30, and 0.2 nM, respectively, which are about 200-fold lower than that of the unamplified colorimetric assays . The colorimetric strategy developed herein provides a novel system for the detection of low concentrations of analytes in complex biological samples.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yi Zhang,Yuhang Liu,Feng Huo,Baowen Zhang,Wenzhen Su,Xiupei Yang
Nanoflakes are materials with high dispersion, a large specific surface area, and a high number of active sites that can provide a good platform for various fluorescence sensors and are very popular among researchers. In this study, a nanoflake-like zinc metal–organic framework (Zn-MOF) was successfully synthesized from the organic ligand 1,2,4,5-tetra(1H-imidazol-1-yl)benzene and zinc nitrate. The synthesized Zn-MOF nanoflakes are extremely soluble in water and exhibit high fluorescence stability. Since Cr2O72– can significantly quench the fluorescence of Zn-MOF aqueous solution, a rapid detection method for Cr2O72– content in water was constructed with a linear range and linear correlation of 0.3–20 μM and 0.992, respectively. The fluorescence quenching constant of the Zn-MOF is KSV = 2.003 × 104 M–1, and the detection limit for Cr2O72– is as low as 0.09 μM. Through the study of fluorescence lifetime and UV absorption, it is proven that the mechanism of Cr2O72– quenching the fluorescence of the Zn-MOF is the inner filter effect. In addition, even after being applied five times, the Zn-MOF still maintained good detection performance for Cr2O72–. The proposed method was successfully applied to the determination of real water samples, confirming that it can be used as an alternative method for the detection of Cr2O72– in environmental samples.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Xiaoxiao Gao,Yan Zhang,Zheng Fu,Jiashuo Tian,Liuping Zhang,Wanqiong Li,Shuailiang Li,Fengling Cui
In this paper, rhodamine B (RhB) was modified on carbon dots (CDs) by hydrothermal method , and a double emission ratiometric fluorescent probe (RhB-CDs) with red luminescence was successfully constructed. The synthesized RhB-CDs had exceptional optical properties and exhibit two emission peaks (480 nm and 590 nm) at 350 nm excitation. It could be used for ratiometric detection of MnO 4 − and Cr 2 O 7 2− , and the fluorescent color would also change (red to orange) when the pH changed from 6 to 7, showing great application potential in the field of sensing and detection. Moreover, the ratio of the emission peak fluorescence intensity had a linear relationship with the water content of alcohols, which was successfully used to detect actual water samples. In addition, the synthesized RhB-CDs had low cytotoxicity and were successfully used for multicolor cell imaging .
研究领域:
分析化学
·
生物医学
·
材料科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Linfeng Liang,Jianan Cui,Xinrong Han,Yinkang Ding,Jing Yang,Sanhu Zhao,Huan Li
Previously, we reported a 1,3,5-triazine-based metal–organic framework (MOF) constructed via the in situ hydrolysis of melamine. However, the use of template molecules within the pores posed significant challenges for material activation and resulted in pronounced fluorescence quenching. In this work, we introduce a more sustainable and template-free synthetic strategy by directly employing ammeline as the organic ligand to construct a triazine-based MOF, SXU-120(ammeline). This approach simplifies the activation process, enhances solid-state fluorescence, and improves stability. The resulting MOF demonstrates high sensitivity and selectivity for aqueous Cr2O72– ions, achieving a Stern–Volmer quenching constant (KSV) of 5.13 × 104 M–1. Furthermore, a scalable reflux-based synthesis route was developed, reinforcing the material’s potential for practical and eco-friendly environmental sensing applications.
研究领域:
材料科学
·
分析化学
·
环境科学
·
无机化学
·
传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Bo Hu,Yong Ma,Ning Wang
Drinking water shortage is a worldwide issue, so that the quality control and treatment of industrial sewage is very important. In this present work, Ag doped carbon nanoparticles (Ag-CDs) were prepared by a simple hydrothermal method, which could be used as an antibacterial and simultaneous detection of dichromate (Cr 2 O 7 2− ). The prepared Ag-CDs were characterized through high resolution transmission electron microscopy (HRTEM), fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The characterization results indicated that the diameter of Ag-CDs were distributed in a range of 2.6–6.0 nm (ca. 4.25 nm) with the functional groups such as OH, NH 2 and CONH in the structure. Cr 3+ and Cr 2 O 7 2− could be distinguished under 365 nm UV light or fluorospectrophotometer. The Ag-CDs nanoparticles was also applied to the detection of Cr 2 O 7 2- in real water samples. There exhibits excellent antibacterial performance to both Escherichia coli O157:H7 ( E. coli O157:H7) and Staphylococcus aureus ( S. aureus ) for Ag-CDs nanoparticles. E. coli O157:H7 or S. aureus was deal with 2 μg mL −1 of Ag-CDs nanoparticles under 5 min with a killing rate of 100%, respectively. As a novel dichromate-sensitive antibacterial, the Ag-CDs nanoparticles hold great promise to broaden application in the environment pollution and water purification.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 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）