Nuclear Engineering and Technology
·
2017
·
IF 1.144
Shuting Zhuang,Yanan Yin,Jianlong Wang
Chitosan was modified by gamma radiation–induced grafting with maleic acid and then used for the removal of cobalt ions from aqueous solutions. Chitosan-g-maleic acid was characterized by Fourier Transform infrared spectroscopy (FT-IR). The effect of the dose (1–5 kGy) and monomer concentration (0.3–1.3%, m/v) on the grafting ratio was examined. The adsorption kinetics and isotherms were also investigated. The results showed that the optimal dose for grafting was 2 kGy. When monomer concentration was within the range of 0.3–1.3% (m/v), the grafting ratio increased almost linearly. For the adsorption of cobalt ions by chitosan-g-maleic acid beads, the pseudo second-order kinetic model (R 2 = 0.99) and Temkin isotherm model (R 2 = 0.96) were able to fit the experimental data reasonably well. The equilibrium adsorption capacity of cobalt ions increased from 2.00 mg/g to 2.78 mg/g after chitosan modification.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Ruth Antwi-Baah,Malcom Frimpong Dapaah,Yajing Wang,Xiaoqin Chen,Heyang Liu
Zeolitic imidazolate frameworks (ZIFs) show promise in fighting bacterial resistance, yet crucial gaps in research hinder their clinical use. For the first time, through meticulous exploration, we unravel the correlation between the size, shape, and zinc/cobalt ion content of 25 ZIF variants and their antibacterial performance in addition to their mechanism pattern, giving special focus to oxidative stress. Notably, a novel morphology-size map of the 25 different ZIFs is established under five main groups namely, small cubes (SC), large cubes (LC), rhombic dodecahedron-large cubes (RD-LC), rhombic dodecahedron (RD), and spherical-rhombic dodecahedron (S-RD) ZIFs. The antibacterial experiments against Staphylococcus aureus showed that ZIFs in the SC group with higher cobalt content had the lowest minimum inhibition concentration (MIC) of 12.5 μg mL−1. Conversely, increased zinc content yielded better antibacterial activity for the other groups. Furthermore, our investigation into the mechanisms revealed cobalt's crucial role in fostering reactive oxygen species (ROS) accumulation, correlating with glutathione (GSH) depletion. Remarkably, the differential responses of ZIF-8 and ZIF-67 to the antioxidant N-acetyl cysteine (NAC) shed light on nuanced pathways governing antibacterial performance. While ZIF-8 demonstrated reduced efficacy, the antibacterial performance of ZIF-67 remained either sustained or modestly improved under antioxidant conditions. Overall, these findings not only enrich our comprehension of ZIFs but also propel their potential for targeted antibacterial interventions, thereby fostering confidence in their clinical translation.
研究领域:
材料科学
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微生物学
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医学
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高影响因子
International Journal of Environmental Science and Technology
·
2017
·Vol. 15
·期 2
·385-394
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IF 1.915
Zhuang S. T.,Yin Y. N.,Wang J. L.
Abstract In this paper, we modified chitosan beads in order to simultaneously detect and adsorb Co 2+ from aqueous solution. Firstly, 4-(5-chloro-2-pyridylazo)-1,3-phenylenediamine (5-Cl-PADAB) was used as selective probe for Co 2+ with color changing from yellow to pink, and the UV–Vis spectra showed that the λ
max changed from 439 to 504 nm. Then a novel biomaterial was synthesized with 5-Cl-PADAB (metal indicator), chitosan (biosorbent) and EDTA anhydride (cross-linker and chelating agent). The analysis of Fourier transform infrared and energy-dispersive X-ray spectra proved that 5-Cl-PADAB and EDTA were successfully connected to chitosan. The modified chitosan bead was selective probe for Co 2+ with a remarkable color change from white to pink, and the UV–Vis spectra showed that the λ
max changed from 441 to 459 nm. The adsorption of cobalt ions onto the modified chitosan beads followed pseudo-second-order ( R
2 = 0.99) kinetics and the Langmuir isotherm model ( R
2 = 0.80). Comparing with chitosan beads, the q
e of the modified one increased from 2.00 to 7.97 mg/g. The modified chitosan beads are promising biomaterial for simultaneous detection and removal of Co 2+ from aqueous solution. Graphical Abstract
研究领域:
环境科学
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材料科学
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生物化学
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高影响因子
Environmental Science-Nano
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2025
·
IF 5.1
Yinyin Peng,Yang Luo,Shuyuan Liu,Yin Cong,Derong Liu,Bowen Hu,Xiaoqin Pu,Guoyuan Yuan,Wei Xiong
This study addresses the challenge of cobalt ion separation by developing novel MOF nanofibers, Co(II)-PIIMs. Co(II)-SIM-IIP was synthesized using zinc-based MOFs (SIM-1) as a matrix and tetraethylpentadiamine (TEPA) as a functional monomer through the ion-imprinting technique (IIT). These Co(II)-SIM-IIP particles were then incorporated as fillers into a polyacrylonitrile (PAN) substrate to fabricate Co(II)-PIIMs-x nanofibers via electrospinning, aimed at selective cobalt ion separation. The optimal performance was achieved at a 10% doping level of Co(II)-SIM-IIP, resulting in a maximum adsorptive capacity of 112.74 mg g−1, a membrane flux of 1095 L m−2 h−1, and a retention rate of 43.49%. The material demonstrated excellent selectivity, exhibiting high selectivity factors for various ions, such as Ca2+ (7.42), K+ (55.98), Mg2+ (72.30), and Ni2+ (1.28). The adsorption mechanism revealed that cobalt adsorption onto Co(II)-PIIMs is primarily governed by chemisorption, facilitated by the uniform distribution of cobalt on the surface of the nanofibers. Importantly, after five cycles, Co(II)-PIIMs exhibited outstanding regeneration capability, retaining over 95% of their initial adsorption capacity. These remarkable selectivity factors underscore the material's potential for efficient cobalt ion separation and purification in environmental remediation applications.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2018
·
IF 3.849
Deyou Yu,Lili Wang,Minghua Wu
The dye and heavy metal are two principal concomitant pollutants in industrial wastewaters, posing a serious threat to public health and the environment. Herein, we developed a novel strategy to convert banana peels into hierarchically porous carbon (BPCA) and porous carbon oxide (BPCAO) for the simultaneous removal of methylene blue (MB) and Co(II). The as-prepared carbons were systematically characterized by SEM, TEM, BET, FT-IR and XPS. Compared to BPCA, BPCAO showed a better adsorption performance due to its abundant surface oxygen-containing groups. In the mono-component systems, both MB and Co(II) adsorption onto BPCAO were well described by the pseudo-second-order and Langmuir models. The maximum adsorption capacities of MB and Co(II) were calculated to be 1303.54 and 122.39 mg/g at 298 K, respectively. In the binary system, the interaction between MB and Co(II) was determined and it depended on the initial concentration of Co(II). The adsorption mechanism of MB involved electrostatic interaction, π-π stacking and hydrogen-bonding while that of Co(II) was mainly ruled by the complexation and/or ion-exchange. This study indicated BPCAO could be a favorable biomass-derived adsorbent for the simultaneous removal of the dye and heavy metal.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Kanayo L. Oguzie,Meng Qiao,Emeka E. Oguzie
Anthracene (ANTH) is a difficult to degrade polycyclic aromatic hydrocarbon that can find its way into water bodies through the food chain. In this study, oxidative degradation of anthracene (ANTH) in aqueous solution was undertaken using cobalt ion activated peroxymonosulphate (PMS) that relies on the action of strongly oxidizing sulphate radical anion (SO 4 − ) and hydroxyl radical ( OH). Following the often-reported tendency of natural organic matter to interfere with water treatment interventions, the effect of humic acid (HA) on the oxidative degradation process and efficiency was assessed as well. Results obtained show clearly that Co-activated PMS was very efficient for the degradation of ANTH in water, with complete degradation achieved within 90 min. Degradation was achieved following a 3-stage profile, involving an initial rapid degradation stage, an intermediate slower step and a final steady state degradation state. HA manifested both beneficial and adverse effects on ANTH degradation, modifying the 3-stage degradation mechanism, delaying the process, but not necessarily the final outcome of complete degradation. The local reactivity of ANTH molecule was modelled via quantum chemical computations, which enabled identification of electron-rich regions on the molecule, where attack by oxidizing species would be initiated. This study has shown that the PMS/Co oxidation process is effective for treating anthracene contaminated water, even in the presence of natural organic matter.
研究领域:
环境科学
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化学
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高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Hengkun Zhao,Yu Feng,Jingbo Zhao
Thermoset polymers are challenging to reprocess and recycle, leading to significant environmental pollution at the end of their life. Incorporating dynamic covalent bonds into cross-linking networks offers an effective solution to these issues. In this study, a partially biobased tris(aldehyde) or tris(vanillin) monomer (TVA) was synthesized through the ring-opening reaction of vanillin with trimethylolpropane triglycidyl ether. Four H 2 N-terminated polyamides with pyridine pendent groups (PY-DAs) were synthesized by polycondensation of a pyridine-containing diester with various diamines. A series of poly(amide-imine) vitrimers with pyridine rings (PYPAIs) were then prepared by reacting TVA with PY-DAs. The incorporation of polyamide segments improved the mechanical properties and thermal stability, whereas the imine bonds provided reprocessability, degradability, and self-healing capabilities. PYPAIs show leading mechanical properties with the tensile strength up to 69.2 MPa to previous reported poly(amide–imine) vitrimers. PYPAI complexes (PYPAIs-Co 2+ ) were formed through coordination with cobalt ions, and the mechanical properties of PYPAIs-Co 2+ were further improved. PYPAIs-Co 2+ exhibited a solvatochromic property in methanol, which may make them used as potential sensor for polar solvents.
研究领域:
材料科学
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环境科学
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高影响因子
ChemSusChem
·
2025
·
IF 6.6
Jie Wang,Chaowu Wang,Qibo Zhang
Graphical The work develops an efficient solvent extraction methodology using Cyanex 272 for the recovery of cobalt from Co(II)-containing waste Ethaline electrolytes, while enabling solvent regeneration. This proposed method provides an economically viable, highly efficient, and environmentally sustainable approach for recovering metal ions from waste deep eutectic solvent (DES) electrolytes. Efficient recovery of metals from secondary resources is essential to address resource shortages and environmental crises. The development of a cheap, environmentally friendly, and highly efficient recovery pathway is essential for resource retrieval. In this study, we propose a high-efficiency extraction approach utilizing bis(2,4,4-trimethylpentyl) phosphonic acid (Cyanex272) to recover cobalt from waste choline chloride/ethylene glycol (Ethaline) electrolyte containing Co(II) ions. By adjusting the water content of the system to modify the ligand of Co(II) ions, combined with pH adjustment, we achieved an extraction efficiency exceeding 99.9 % for Co(II) ions. Subsequently, oxalic acid (OA) was added as a stripping agent to achieve a recovery efficiency of over 99.4 % for cobalt. The extractant can be recycled more than 15 times after stripping. Impressively, more than 98.3 % of the water-diluted Ethaline extraction raffinate was recovered through reduced pressure distillation while maintaining the structure of recovered Ethaline unchanged. This work provides an economical, efficient, and sustainable pathway for treating waste Ethaline electrolyte-containing metal ions.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2022
·
IF 5.141
Hong Li,Yang Zhou,Jianxiu Du
Ascorbic acid can serve as an efficient coreactant for luminol chemiluminescence (CL) reaction. An observable CL emission is produced when mixing ascorbic acid with luminol in an alkaline condition. The CL signal is further dramatically enhanced by cobalt(II) ions. This CL system was exploited as a new method for direct determination of ascorbic acid with a flow injection mode. A good linear response is acquired between the CL signal and ascorbic acid concentration in 5.0–1000.0 ng/mL range with a detection limit of 1.3 ng/mL. The relative standard deviations are 2.3% for intra–day (n = 11) and 3.7% for inter–day (n = 3) by parallel determination of 0.5 μg/mL ascorbic acid solution. The method has good selectivity for ascorbic acid since no obvious responses are observed for a variety of inorganic ions and biological substances. The practicability of the method has been demonstrated by the analysis of ascorbic acid in some soft drinks.
研究领域:
分析化学
·
食品科学
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DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Jing Hu,Hanjiao Chen,Xiandeng Hou,Xiaoming Jiang
Herein, we report a discovery that photochemical vapor generation (PCVG) of molybdenum (Mo) can be synergistically enhanced dramatically by cobalt and copper ions sourced from acetates in the medium of formic acid, utilizing a flow-through reactor. The nature of this new PCVG was probed for the first time by an electron paramagnetic resonance (EPR) spin trapping technique for its possible reaction mechanism. Carboxyl and hydroxyl free radicals were verified during PCVG processes, and the results indicate that variations in the relative amounts and proportions of free radical species may account for the synergistic effect from concomitant Co2+ and Cu2+, as well as the generation of molybdenum hexacarbonyl from the UV-induced photolysis of formic acid. Under “dry” plasma conditions, the simultaneous spiking of Co2+ and Cu2+ to 20% (v/v) formic acid solutions and a 60 s irradiation time could give rise to a 15-fold enhancement in signal intensities, together with a blank-limited but still impressive limit of detection of 6 ng L–1 (6 ppt) by inductively coupled plasma mass spectrometry (ICP-MS). The accuracy and reliability of this methodology was validated by analysis of molybdenum in a seawater certified reference material, CASS-6, as well as two varieties of drinking water and seawater samples, with satisfactory spike recoveries (91–101%).
研究领域:
分析化学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Caijiao Yu,Yueyao Liang,Wenjuan Xue,Zhengqing Zhang,Xuemeng Jia,Hongliang Huang,Zhihua Qiao,Donghai Mei,Chongli Zhong
Metal-organic framework (MOF) membranes have significant potential for use in efficient gas separation. However, fabricating polymer substrate-supported ultra-thin MOF membranes with no defects remains a challenge. Herein, we proposed an in situ interface self-repair strategy for fabricating ultra-thin and defect-free ZIF-67 membranes for the first time. This was realized by preparing a polyvinyl alcohol (PVA)-Co 2+ interfacial layer containing a Co 2+ ion layer and a PVA-Co 2+ complex layer. The PVA-Co 2+ interfacial layer released Co 2+ ions and acted as a metal source to form ZIF-67 membranes by reducing the coordination rate of Co 2+ ions with 2-methylimidazole. The embedded Co 2+ ions functioned as anchor sites for the nucleation of ZIF-67 membrane assisted by the interface-enhanced deprotonation of 2-methylimidazole. Especially, the slow release of Co 2+ ions from the PVA-Co 2+ interfacial layer facilitated self-repair of defects to form a continuous and dense MOF layer. ZIF-67 membranes, 80-280 nm thick, were successfully synthesized and demonstrated unprecedented CO 2 permeance and good CO 2 /N 2 selectivity. This work provides a promising strategy for the fabrication of ultra-thin and defect-free MOF membranes on polymeric support layers for use in practical applications.
研究领域:
材料科学
·
化学工程
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Rui-Xian Zhao,An-Yong Liu,Qiu-Lin Wen,Bi-Chao Wu,Jun Wang,Yi-Lin Hu,Zheng-Fen Pu,Jian Ling,Qiue Cao
A glutathione stabilized Au nanoclusters (GSH-Au NCs) was synthesized here and used to selective detection of cobalt ion. The as-prepared GSH-Au NCs had strong green light emission around 500 nm, and the features of the NCs have been systematically characterized by UV–vis absorption, X-ray photoelectronic spectroscopic, Fourier transform infrared spectroscopy and transmission electron microscope characterization. The interactions between the GSH-Au NCs and metal ions was studied, and the results indicated that the fluorescence of the GSH-Au NCs could be quenched in the presence of Co 2+ ion at pH of 6.0. The quenching ratio was linear with the concentration of Co 2+ ions, and the calibration curve was I 0 /I = 0.1187c co + 0.6085 in the Co 2+ concentration ranges from 2.0 to 50.0 μM with correlation coefficient ( R 2 ) of 0.9950 and the limit of detection (LOD, 3 σ ) of 0.124 μM. In addition, we collected environmental water samples to test the reliability of the method and demonstrated this method is simple, rapid, and selective.
研究领域:
分析化学
·
纳米材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
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