CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Ting Wang,Pan Zhao,Nan Lu,Hongche Chen,Conglu Zhang,Xiaohong Hou
Attractive magnetic metal-organic framework (MOF) material Fe 3 O 4 /MIL-101(Cr) (Matérial Institute Lavoisier, MIL) was synthesized by a simple reduction–precipitation method, and applied as an effective sorbent to the removal of two acid dyes, acid red 1 (AR1) and orange G (OG), in water. The novel synthetic method avoided the oxidation of Fe 2+ and made the Fe 3 O 4 /MIL-101(Cr) composite have the advantages of strong magnetism, large surface areas and excellent dispersion effect. Parameters that influenced the adsorption process, such as solution pH, adsorbent dosage, ionic strength, and so on, were investigated. Under the optimum conditions, adsorption kinetics and isotherms were determined from the obtained experimental data. The adsorption kinetics suggested the adsorption process of Fe 3 O 4 /MIL-101(Cr) toward AR1 and OG met the pseudo-second-order kinetic model. The adsorption isotherms were fitted by Langmuir, Freundlich and Dubinin–Radushkevich (D–R) isotherm models. Compared with the Freundlich and D–R models, the Langmuir isotherm model was found to be suitable to describe the equilibrium data, suggesting that the uptake of AR1 and OG by the Fe 3 O 4 /MIL-101(Cr) would be through monolayer adsorption. The thermodynamic results demonstrated that the adsorption was a spontaneous, exothermic and entropy decreased process. In addition, the Zeta potential data with pH value of AR1 and OG indicated that the electrostatic interactions between the dyes and the adsorbent might be critical to the adsorption mechanism. The used Fe 3 O 4 /MIL-101(Cr) could be regenerated by washing with NaOH solution and reused at least six times. The maximum adsorption capacities of the magnetic composite toward AR1 and OG were up to 142.9 mg g −1 and 200.0 mg g −1 , respectively. These results demonstrated that the novel composite would be an effective and easily re-usable adsorbent for AR1 and OG.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Arabian Journal of Chemistry
·
2023
·
IF 6
Qingrong Han,Fei Liu,Chengjiu Wang,Zhentao Tang,Cheng Peng,Yuzhu Tan
In recent years, the quality and safety issues of Chinese medicinal herbs have received great attention worldwide. Thereinto, heavy metal contamination has been one of the most serious concerns. Compared to the wide research in the analysis of heavy metals in medicinal herbs, the studies on the removal of heavy metals are relatively limited. In this study, polyethylene glycol functionalized Fe 3 O 4 @MIL-101(Cr) (Fe 3 O 4 @MIL-101(Cr)@PEG) was designed and synthesized to remove heavy metals from the decoction of Ligusticum chuanxiong Hort. The in-house fabricated Fe 3 O 4 @MIL-101(Cr)@PEG was characterized by a porous structure and a large specific surface area. Then, the efficiency of the material for the removal of five heavy metals was tested under optimal adsorption conditions. Meanwhile, the content of Senkyunolide A, Senkyunolide I, and Ferulic acid, the solid content, and the HPLC fingerprints similarity were used as the quality monitoring indicators of Ligusticum chuanxiong Hort decoction before and after the heavy metal removal. Results showed that the magnetic nanomaterial had excellent removal efficiency for As 5+ (81.4 %), Cd 2+ (88.19 %), and Pb 2+ (83.79 %) and certain removal efficiency for Ni 2+ (51.59 %) and Zn 2+ (55.4 %) under the spiked concentration of 50 μg/mL. The content of Senkyunolide A, Senkyunolide I, and Ferulic acid were decreased by less than 8.00 % after the removal of heavy metals. Besides, the loss rate of solid content was only 0.18 %, and the fingerprints similarity was over 99.9 %. The results indicated that Fe 3 O 4 @MIL-101(Cr)@PEG could efficiently and selectively remove heavy metals from Ligusticum chuanxiong Hort without affecting its effective components. Due to the advantages of low-cost, simple manipulation, and good efficiency, the material can be recommended for heavy metals removal from the aqueous solutions of medicinal herbs, providing a new and promising application for the removal of exogenous contaminants in medicinal herbs.
研究领域:
药学
·
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Li Yang,Shuang Wang,Zhongshui Xie,Rongrong Xing,Runqin Wang,Xuan Chen,Shuang Hu
A novel deep eutectic solvent - loaded magnetic solid phase extraction (DES-L-MSPE) method was proposed, which was based on the direct loading of a hydrophobic DES composed of L-menthol and lactic acid (1:2) into the pores of core–shell magnetic Fe 3 O 4 @MIL-101(Cr) nanoparticles. The function of DES was to condition the Fe 3 O 4 @MIL-101(Cr) and promote liquid phase microextraction for the analytes. Through coupling with HPLC-UV analysis, this method was utilized for the determination of six non-steroidal anti-inflammatory drugs (NSAIDs), including ketoprofen, naproxen, flurbiprofen, diclofenac sodium, ibuprofen, and mefenamic acid in environmental water samples. The influencing parameters such as type and ratio of DES, amount of adsorbent, sample solution pH, salt concentration, extraction time, elution solvent and time were investigated and optimized in detail. Under the optimal conditions, the method exhibited good linearity (5.0–1000 μg/L for ketoprofen, ibuprofen, 1.5–600 μg/L for flurbiprofen, mefenamic acid, 2.5–1000 μg/L for naproxen and 3.0–600 μg/L for diclofenac sodium with the correlation coefficients ranging from 0.9972 to 0.9993), low limits of detection (0.20–1.1 μg/L), and high precision (RSD < 8.2 %). Besides, the recoveries in spiked lake and river water samples were 89.8 %–110.4 % and 83.8 %–109.0 %, respectively. Taken together, the established method was proved to be simple, fast, highly sensitive and accurate for the determination of NSAIDs from aqueous matrices.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 8
·2981-2990
·
IF 4.58
Wang Ting,Liu Siyu,Gao Guihua,Zhao Pan,Lu Nan,Lun Xiaowen,Hou Xiaohong
The authors describe a method for magnetic solid phase extraction (MSPE) combined with ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) for the quantitation of eight non-steroidal anti-inflammatory drugs (NSAIDs) in wastewater and environmental water samples. Specifically, the NSAIDs were directly extracted by using a magnetic nanocomposite of type Fe 3 O 4 /MIL-101(Cr) (Matérial Institute Lavoisier, MIL) from 50 mL water samples without any further cleanup. The effects of the amount of adsorbent, pH value, salt concentration, ultrasonic extraction time, desorption solvent nature and volume and desorption time were investigated. Under the optimal conditions, UPLC-MS/MS based detection resulted in the following figures of merit: (a) Linear calibration plots that typically extend from 0.1 (0.2, 0.05, 0.02) to 50 μg·L −1 , depending on the compound; (b) detection limits between 3 to 60 ng·L −1 ; and (c), recoveries varying from 81.2% to 116.8% with relative standard deviations between 0.4% and 10.8%. The adsorption of NSAIDs on Fe 3 O 4 /MIL-101(Cr) was characterized by adsorption isotherms, kinetics and thermodynamics studies and provides a deeper insight into the adsorption mechanism. Compared to other method for pretreatment and preconcentration of NSAIDs, the new method is more rapid, sensitive, accurate and eco-friendly. The method was successfully applied to the determination of the NSAID residues in a variety of real environmental and wastewater samples.
Schematic of a method for determination of non-steroidal anti-inflammatory drugs (NSAIDs) in environmental water by magnetic solid phase extraction based on Fe 3 O 4 /MIL-101(Cr) combined with UPLC-MS/MS. The adsorption mechanism of NSAIDs on Fe 3 O 4 /MIL-101(Cr) was studied.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Mengtian Jia,Yanyan Zhu,Dong Guo,Xiaogang Bi,Xiaohong Hou
Core-shell magnetic Fe 3 O 4 @MIL-101(Cr) nanoparticles were synthesized via layer-by-layer self-assembly method. Using Fe 3 O 4 @MIL-101(Cr) as support, Fe 3 O 4 @MIL-101(Cr)@MIP was prepared with phenytoin as template, acrylamide as functional monomer , ethylene glycol dimethacrylate as cross-linker, methanol and acetonitrile as porogen , azoisobutyronitrile as initiator. The materials were characterized by a serious of characterization experiments. The prepared Fe 3 O 4 @MIL-101(Cr)@MIP was demonstrated to possess good separability, large adsorption capability, excellent adsorption selectivity , good durability and reusability via adsorption experiments. Subsequently, a magnetic solid phase extraction method (MSPE) based on Fe 3 O 4 @MIL-101(Cr)@MIP combined with high performance liquid chromatography-ultraviolet detector (HPLC-UV) was established for the determination of phenytoin sodium in plasma samples. Experimental parameters including pH, the amount of adsorbent, extraction time, elution conditions, the concentration of NaCl were investigated to optimize extraction process. The method was validated. The linearity was observed in the range of 0.05–40 μg mL −1 with a lower limit of quantification of 0.05 μg mL −1 . The calibration equations were y = 0.2514x + 0.0319 ( r 2 = 0.9938), y = 0.2888x + 0.0472 ( r 2 = 0.9943), y = 0.2565x + 0.0418 ( r 2 = 0.9976), respectively. The recoveries ranged from 89.2 to 94.3%, intra- and inter-day precision (RSDs) ranged from 2.1 to 9.7% and 2.9–9.2%, respectively. The established MSPE-HPLC-UV method was time-saving, sensitive, accurate, environmental friendly, and drastically reduced the complex matrix interferences. The established method was successfully applied for phenytoin sodium determination in real plasma samples, providing new directions for therapeutic drug monitoring.
研究领域:
分析化学
·
材料科学
·
药物分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYHEDRON
·
2022
·
IF 2.975
Chunqing Wang,Na Xia,Siming Zhu,Lin Chen,Liang Chen,Zhendong Wang
In this study, α- l -rhamnosidase was immobilized on magnetic Fe 3 O 4 /MIL-101 (Cr) nanoparticles using MIL-101(Cr) as precursor by crosslinking method. The crosslinking agent concentration ratio and crosslinking time were EDC/NHS 1:1 and 2 h, respectively. The immobilized materials were characterized by FT-IR, XRD, SEM and VSM. The saturation magnetization of the prepared magnetic nanoparticles was 46.2 emu/g. The optimum pH and temperature of immobilized enzyme were 6 and 60 °C. The application of immobilized enzyme in the preparation of hesperidin dihydrochalcone glucoside (HMGDC) by hydrolysis of hesperidin dihydrochalcone (HSDDC) was studied. The results showed that immobilized enzyme had better temperature resistance, repeatability and stability than free enzyme. The immobilized enzyme activity was 293.55 U/g, and the recovery was 116.03%. After treatment at 60 °C for 4 days, the enzyme activity remained at 24.6%. The conversion rate of HSDDC reached 93.1%.
研究领域:
生物催化
·
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Qinchao Shao,Xiubin Zhang,Pei Liang,Qiang Chen,Xiaohua Qi,Mingqiang Zou
Fabrication of a magnetic substrate based on metal–organic frameworks (MOFs) with high sensitivity and stability for surface-enhanced Raman scattering (SERS) analysis were reported in this paper. MIL-101(Cr) nanoparticle prepared via a traditional hydrothermal reaction, which was combined with Fe 3 O 4 to synthesize the Fe 3 O 4 /MIL-101(Cr) composites. Then, the concentration of chloroauric acid and the time of reduction reaction were adjusted to acquire the optimal Au/Fe 3 O 4 /MIL-101(Cr) (AF-MIL) SERS substrate. The detection ability of the substrate can down to 10 -8 mol/L for Rhodamine 6G (R6G) as probe molecule, and the relative standard deviation (RSD) is only about 4.48 %, which indicates that it possesses wonderful SERS performance and uniformity. Finally, the as-synthesized substrate has been adopted to test the trace level sulfapyridine, with its desirable detection ability can down to 10 -6 mol/L. Such desirable SERS substrate with facile and effective operation holds great promise in the fast sensitive detection of the antibiotic residue and some other pollutants in environment.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 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）