TALANTA
·
2019
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IF 4.916
Zhanqiang Yang,Zongying Li,Feifang Zhang,Bingcheng Yang,Shengmao Zhang
A novel hydrophilic polymer-based anion exchanger has been described for ion chromatography (IC). It is prepared by grafting polyethyleneimine (PEI) onto the poly(glycidylmethacrylate-divinylbenzene) (GMA-DVB) substrate, followed by hydrolytic treatment to convert the residual epoxide groups onto the surface of GMA-DVB substrates to hydroxyl groups , finally quaternized PEI by a molecule containing epoxide group. Hydrophobic surface of GMA-DVB substrate can be converted to hydrophilic, aiming to reduce unwanted non-ionic interaction from the substrate. After optimizing the reaction conditions, the obtained anion exchanger showed good separation towards standard inorganic anions under the suppressed mode and complete elution of seven common inorganic anions could be achieved in less than 16 min by using potassium bicarbonate eluent . It also demonstrated fast dynamic kinetic and enabled the separation of 7 anions within 3 min at the isocratic mode. Column efficiency of the anion exchanger was up to 34,000 /m.
研究领域:
分析化学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2016
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IF 3.926
Qiming Zhao,Shuchao Wu,Kai Zhang,Chaoyan Lou,Peiming Zhang,Yan Zhu
This work reports the application of hydrothermal carbon nanospheres (HCNSs) as stationary phases in ion chromatography. HCNSs were facilely quaternized through polycondensation of methylamine and 1,4-butanediol diglycidyl ether. The quaternization was confirmed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Owing to the electrostatic interaction, quaternized HCNSs were equably attached onto the surface of sulfonated polystyrene-divinylbenzene (PS-DVB) beads to construct the anion exchangers. The aggregation was verified by scanning electron microscopy and elemental analysis. Common anions, aliphatic monocarboxylic acids, polarizable anions, and aromatic acids were well separated on the stationary phases with good stability and symmetry. The prepared column was further applied to detect phosphate content in Cola drink samples. The limit of detection (S/N = 3) was 0.09 mg/L, and the relative standard deviation (n = 10) of retention time was 0.31%. The average recovery was 99.58%.
研究领域:
分析化学
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材料科学
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 21
·2112717
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IF 19.924
Yi-Ming Zhao,Lin Cheng,Kai-Yao Wang,Xin Hao,Juan Wang,Jia-Ying Zhu,Meng Sun,Cheng Wang
Switchable coadsorption and separation for elimination/partitioning of Cs + and Sr 2+ is achieved by pH-controlled ion exchange using a potassium thioantimonate K 2 Sb 4 S 7 ·2H 2 O ( SbS-1K ) with fantastic pH durability from diluted NaOH (pH 12) to concentrated HCl (3 m ). At pH 6, SbS-1K exhibits ultrafast adsorption kinetics ( R ≈ 90% in 2 min for Cs + and 20 min for Sr 2+ ) and high removal rates ( R ≈ 98–99%) at equilibrium for both Cs + and Sr 2+ . At pH 2, the Sr 2+ adsorption is inhibited by H + with a great loss in R Sr to 11.18%, whereas the R Cs remains at 96.99%, contributing to a top-ranked separation factor SF Cs/Sr of 256. The SbS-1K -filled ion exchange column can be switched between the eliminating ( R Cs > 99.91%; R Sr > 98.19%) and separating ( R Cs > 98.99%; R Sr ≈ 0±3%) modes for treating continuous flow with a variation from pH 6 to pH 2 or vice versa. The SbS-1K /PTFE membrane exhibits coadsorption and separation effects for filtration of low concentrated mixed Cs + and Sr 2+ solution (1 ppm for each), even at an ultrafast vacuum filtration speed (30 mL min –1 ). Combined with easy synthesis and high β/γ irradiation resistance, SbS-1K represents a new-concept bifunctional exchanger with discriminating intelligence for equipment innovation.
研究领域:
环境科学
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材料科学
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核废料管理
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化学工程
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DOI
高影响因子
Toxics
·
2024
·Vol. 12
·期 5
·325
·
IF 3.9
Ge Song,Honglian Tan,Chuhan Cheng,Peng Li,Xinyang Sun,Yuling Zhou,Yong Fang
Hexavalent chromium (Cr(VI)) is known as the most hazardous species of chromium. Speciation analysis of Cr in foods is of a great significance for assessing its influences on human health. In this study, a fast HPLC-ICP-MS method for the determination of Cr(VI) was developed for determining the content of Cr(VI) and also investigating its transformation in foods. The developed method employs an alkali extraction and weak anion-exchange column separation for distinguishing the Cr species, facilitating accurate Cr(VI) quantification within 1.5 min. This technique was applied to determine the Cr(VI) levels in a range of food products, including yoghurt, milk powder, rice flour, orange juice, green tea, white vinegar, and whole wheat bread. The results showed that no Cr(VI) was detected in these food products. Spiking experiments revealed that the recovery rate of Cr(VI) decreased with the increase in its contact time with food products. A further exploration of Cr(VI) in various food components such as vitamin C, tea polyphenols, whey proteins, gelatin, fructose, and cellulose indicated the conversion of Cr(VI) to organic Cr(III) over a period from 20 min to 60 h. It was found that high temperatures and acidic conditions accelerated the rate of Cr(VI) conversion to organic Cr(III) in the six food components mentioned above. This evidence suggests that natural reducing substances in foods probably prevent the occurrence of Cr(VI).
研究领域:
分析化学
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食品科学
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环境健康
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DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
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2024
·
IF 6.1
Kai-Yao Wang,Meng-Yu Li,Lin Cheng,Xin Hao,Cheng Wang
Long-lived 137Cs/134Cs, 60Co, and 63Ni with high-energy β/γ emissions are primary toxic fission/activation products in nuclear-contaminated water, causing irreversible damage to the ecological environment and human health. Rapid remediation of these radionuclides emerges as an urgent task, while the deficiencies in adsorption kinetics, selectivity and acid resistance hinder the material innovation for practical applications. Herein, we have developed a hybrid cadmium/tin selenide adsorbent K3.4(CH3NH3)0.45(NH4)0.15Cd2Sn3Se10·3.4H2O (CdSnSe-2K) for the enrichment and sequestration of Cs+, Co2+, and Ni2+ ions. CdSnSe-2K features a unique open-framework constructed from the interlinkage of T2-{M4Se10} (M = SnIV/CdII) supertetrahedral clusters and M bridges, accelerating the ion transfer in the tunnel system and thus affording quick kinetics (k2 = 9.706, 0.182, 0.099 g mg−1 min−1 for Cs+, Co2+, Ni2+). Remarkably, the removal rate RCs increases to 98.54% in just 2 min and 99.57% in 5 min (equilibrium), which is responsible for an ultra-high distribution coefficient Kd of 2.31 × 105 mL g−1. The soft-Lewis basic Se component endows CdSnSe-2K with a fantastic adsorption selectivity for Cs+, Co2+, and Ni2+ against various coexisting cations and anions in complex actual water environments even including the highly salty sea water medium. CdSnSe-2K exhibits a fantastic acid/base tolerance over pH = 2–13, and the maximum adsorption capacities qCsm, qCom and qNim under neutral condition are 218.08 ± 80.08, 43.95 ± 16.57 and 42.53 ± 16.50 mg g−1, respectively. In addition, CdSnSe-2K single crystals were also employed as the stationary phase for the fabrication of an ion exchange column, which shows an elimination efficiency above 99% in the long-term filtration for Cs+ (8200 BVs), Co2+ (4000 BVs) and Ni2+ (4000 BVs). This work not only highlights CdSnSe-2K as a promising Cs+, Co2+, and Ni2+ scavenger in radionuclide remediation, but also provides a supertetrahedral cluster-based construction strategy for open-framework selenide materials with enhanced adsorption kinetics, selectivity, and acid resistance.
研究领域:
材料科学
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环境科学
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核工程
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化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Yilin Wang,Jin Han,Yun Yue,Yuze Wu,Wenqing Zhang,Wei Xia,Mengqi Wu
The crude polysaccharides CAPS and CAP of Cynanchum Auriculatum , which were prepared by degrading starch by single-enzymatic method (α-amylase) and double-enzymatic method (α-amylase and glucoamylase) respectively, were compared. CAP had good water solubility and higher non-starch polysaccharide content. A homogeneous neutral polysaccharide CAP-W, with the degree of acetylation about 17 %, was obtained from CAP by anion exchange column chromatography. Its detailed structure was identified by various methods. CAP-W, with the weight average molecular weight of 8.4 kDa, was composed of mannose, glucose, galactose, xylose, and arabinose in a molar ratio of 1.27:1.00:0.25:0.10:1.16. The backbone included β -1,4-Man p , β -1,4,6-Man p , β -1,4-Glc p and β -1,4,6-Glc p residues, with branches at the O-6 position of β -1,4,6-Man p and β -1,4,6-Glc p residues, consisting of α -T-Ara f , α -1,5-Ara f , α -1,2,5-Ara f , α -1,3,5-Ara f , T-Xyl p ,1,4-Xyl p , β -T-Man p and β -T-Gal p residues. In vitro immunological experiments suggested that CAP-W improved the phagocytic ability of macrophages, stimulated the release of NO, TNF-α and IL-6 from RAW264.7 cells, promoted the expression of NF-κB and caused nuclear translocation of NF-κB p65.
研究领域:
生物化学
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免疫学
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药理学
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植物科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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