MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Liyu Yang,Xiangcheng Shan,Yumeng Zhao,Zuoyi Xiao,Qingda An,Shangru Zhai
Eutrophication has long been one of the environmental pollution problems, and excess phosphate in water bodies is the main cause of this phenomenon. To solve this problem, magnetic adsorbent with Fe/Ce-loaded zirconium-based metal-organic framework (Fe 3 O 4 /UiO-66-NH 2 /CeO 2 ) was prepared by co-precipitation, microwave assisted and hydrothermal method . The results showed that different molar ratios of cerium and zirconium were the main influencing factors for phosphate adsorption, and the adsorbent exerted its maximum capturing capacity of 260.8 mg/g of phosphate when Ce:Zr = 4:1. The newly synthesized Fe 3 O 4 /UiO-66-NH 2 /CeO 2 was characterized by SEM, XRD , FT-IR, XPS, VSM and TGA . The adsorption process was found to be consistent with the Langmuir adsorption isotherm model and the pseudo-second-order model by batch experiments, indicating that the monolayer chemisorption dominated the adsorption process. Thermodynamic parameters obtained from temperature experiments proved that the phosphate adsorption process is a spontaneous endothermic absorption process and the adsorption experiments with coexisting ions (F − , Cl − , NO 3 − , SO 4 2− , HCO 3 − ) showed that the adsorbent has a unique selectivity for phosphate. Unlike most adsorbents previously studied, Fe 3 O 4 /UiO-66-NH 2 /CeO 2 exhibited consistently efficient adsorption performance over the pH spectrum tested (2 < pH < 10). After five cycles, the adsorbent still maintained favourable adsorption performance. Mechanism of Fe 3 O 4 /UiO-66-NH 2 /CeO 2 adsorption on phosphate was attributed to electrostatic attraction, ligand exchange and inner-sphere complexation. Therefore, the prepared Fe 3 O 4 /UiO-66-NH 2 /CeO 2 with wide pH suitability will be a promising option for capturing phosphate from wastewater.
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高影响因子
ChemistrySelect
·
2024
·Vol. 10
·期 1
·e202405135
·
IF 1.9
Zhanmeng Liu,Mang Lu,Haitao Gan,Jiacheng Li,Guiqing Gao,Manqing Xu,Xianglian Wang
Graphical OTC molecules diffuse to the surface of FU3 to cause film diffusion, and continue to diffuse and fill into large-, medium- and micro-pores of FU3. FU3 can be π─π conjugated and cation─π bonded with the benzene rings and amino groups of OTC. The charged surface of FU3 leads to a strong electrostatic effect in the adsorption process. The doping of Fe 3 O 4 produces structural defects to promote the OTC adsorption. As one of the most stable metal-organic frame materials (MOFs), UiO-66 has attracted extensive attention in the adsorption field. However, the application of UiO-66 is still constrained by the weak electron-hole charge separation capability and the low accessibility of micropores. In this study, the mesoporous defects of UiO-66 were constructed with acetic acid and doped with Fe 3 O 4 to prepare magnetically recyclable Fe 3 O 4 @UiO-66. The doping of Fe 3 O 4 resulted in the formation of denatured mesoporous defects in UiO-66, which was conducive to adsorption oxytetracycline (OTC) in water. The crystal structure and physicochemical characteristics of Fe 3 O 4 @UiO-66 were examined. By using the static adsorption technique, the adsorption characteristics and mechanism of OTC on Fe 3 O 4 @UiO-66 were investigated. The results reveal that Fe 3 O 4 @UiO-66 has an adsorption capacity of 210 mg g −1 and an OTC removal ratio of 84.0%. The pseudo-second-order kinetics, Elovich, and Langmuir isothermal adsorption models were all applicable to the adsorption process. The adsorption process increased entropy and was an endothermic reaction. Solution pH has a little effect on the adsorption performance. This study provides the possibility of one-step synthesis of MOFs that can efficiently adsorb tetracycline antibiotics in water with low cost and excellent recyclability and reusablity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shuangqin Tian,Xin Shi,Shujie Wang,Yi He,Bifang Zheng,Xianhong Deng,Ziqin Zhou,Wenbin Wu,Kai Xin,Lihong Tang
With the ever-increasing challenge of heavy metal pollution, the imperative for developing highly efficient adsorbents has become apparent to remove metal ions from wastewater completely. In this study, we introduce a novel magnetic core–shell adsorbent, Fe 3 O 4 @UiO-66-PDA. It features a polydopamine (PDA) modified zirconium-based metal–organic framework (UiO-66) synthesized through a simple solvothermal method. The adsorbent boasts a unique core–shell architecture with a high specific surface area, abundant micropores, and remarkable thermal stability. The adsorption capabilities of six metal ions (Fe 3+ , Mn 2+ , Pb 2+ , Cu 2+ , Hg 2+ , and Cd 2+ ) were systematically investigated, guided by the theory of hard and soft acids and bases. Among these, three representative metal ions (Fe 3+ , Pb 2+ , and Hg 2+ ) were scrutinized in detail. The activated Fe 3 O 4 @UiO-66-PDA exhibited exceptional adsorption capacities for these metal ions, achieving impressive values of 97.99 mg/g, 121.42 mg/g, and 130.72 mg/g, respectively, at pH 5.0. Moreover, the adsorbent demonstrated efficient recovery from aqueous solution using an external magnet, maintaining robust adsorption efficiency (>80%) and stability even after six cycles. To delve deeper into the optimized adsorption of Hg 2+ , density functional theory (DFT) analysis was employed, revealing an adsorption energy of -2.61 eV for Hg 2+ . This notable adsorption capacity was primarily attributed to electron interactions and coordination effects. This study offers valuable insights into metal ion adsorption facilitated, by magnetic metal–organic framework (MOF) materials.
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高影响因子
JOURNAL OF PHYSICAL CHEMISTRY A
·
2020
·
IF 2.6
Lincheng Li,Yunlan Xu,Dengjie Zhong
Herein, we reported a simple solvothermal and chemical oxidation method to synthesize a magnetic core–shell composite (Fe3O4@UiO-66@PANI) for Cr(VI) removal from wastewater. Due to the porosity and stability of UiO-66 and stability, high acid resistance, and multiple active (reducing and chelating) groups of polyaniline (PANI), Fe3O4@UiO-66@PANI exhibited excellent efficiency, regeneration, and reusability performance for Cr(VI) removal. Its maximum adsorption capacity and removal rate were 474.42 mg·g–1 and 99.90%, respectively. The effects of initial pH values, contact time, and initial Cr(VI) concentration on Cr(VI) removal were investigated. The fitted data showed that the adsorption process was consistent with the pseudo-second-order kinetic model and Langmuir isothermal model. The study of the mechanism shows that the excellent efficiency of Fe3O4@UiO-66@PANI is due to the electrostatic adsorption and reduction of Cr(VI) and the chelation of Cr3+. The results demonstrate that Fe3O4@UiO-66@PANI is a promising adsorbent for the Cr(VI) removal.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 20
·7770-7777
·
IF 3.069
Shi-Wen Lv,Jing-Min Liu,Chun-Yang Li,Hui Ma,Zhi-Hao Wang,Ning Zhao,Shuo Wang
A novel magnetic nanocomposite named Fe3O4@UiO-66-SO3H with a core–shell structure was first synthesized via a feasible step-by-step assembly strategy, and then employed as an adsorbent to remove methylene blue (MB) from aqueous solution. The characterization by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and Fourier transform infrared (FT-IR) spectroscopy proved that the Fe3O4@UiO-66-SO3H core–shell nanocomposite was successfully prepared. And the as-synthesized Fe3O4@UiO-66-SO3H had a strong affinity towards MB and the maximum adsorption capacity was 297.3 mg g−1. The adsorption of MB could be basically completed within 15 min. The kinetic and isotherm studies indicated that adsorption data could be well fitted to the pseudo-second-order model and Langmuir model. Significantly, Fe3O4@UiO-66-SO3H could selectively adsorb MB from a mixed solution due to the charge-selectivity effect and possessed good reusability. The electrostatic interaction and the π–π interaction were assumed to play a vital role in the adsorption process. All in all, the current study provided a promising sorbent for the efficient and selective removal of MB from dye-containing wastewater.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 21
·60574-60589
·
IF 5.8
Zhang Xiaoting,Liu Yang,Qu Lingbo,Han Runping
In this study, a green adsorbent (Fe 3 O 4 -UiO-66-NH 2 ) with the ability of addressing the issues of separation and recovery of UiO-66-NH 2 is obtained using a simple co-precipitation method under environmentally benign conditions. Various characterization techniques are utilized for evaluating the properties of the developed adsorbent. The capability of Fe 3 O 4 -UiO-66-NH 2 towards 2,4-dichlorophenoxyacetic acid (2,4-D) and glyphosate (GP) from solution is explored. The results revealed that the magnetization process did not destroy the crystal structure of UiO-66-NH 2 , which ensured that Fe 3 O 4 -UiO-66-NH 2 had good adsorption performance for 2,4-D and GP. The adsorption processes showed a wide pH application range, high salt tolerance, and regeneration performance as well as an excellent adsorption rate. Results from thermodynamic study showed that both processes were spontaneous and endothermic. The unit uptake ability of Fe 3 O 4 -UiO-66-NH 2 for 2,4-D and GP reached up to 249 mg·g −1 and 183 mg·g −1 from Langmuir model at 303 K, respectively. When solid–liquid ratio was 2 g·L −1 , Fe 3 O 4 -UiO-66-NH 2 can reduce the content of 2,4-D or GP with the initial density of 100 mg·L −1 below the drinking water requirement limit. In addition, the reusability efficiency of Fe 3 O 4 -UiO-66-NH 2 towards 2,4-D and GP was found to be 86% and 80% using 5 mmol·L −1 NaOH as eluent. Analysis of simulated water samples indicated that Fe 3 O 4 -UiO-66-NH 2 could achieve the single or simultaneous removal of 2,4-D and GP from wastewater. Summarily, Fe 3 O 4 -UiO-66-NH 2 as a green adsorbent can serve as an alternative for removing 2,4-D and GP from water body.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhitong Xu,Ye Qi,Yueguang Fang,Peng Tian,Guiling Ning,Junwei Ye
Core-shell Fe 3 O 4 @UiO-66-NH 2 nanospheres with superior photocatalytic activity and photo-Fenton performance were synthesized using a layer-by-layer growth strategy. The synthesis involved the use of FeCl 3 , trisodium citrate, sodium acetate, ZrCl 4 , and 2-aminoterephthalic acid as raw materials, with mercaptoacetic acid serving as a modifier. Fe 3 O 4 @UiO-66-NH 2 demonstrated improved visible-light-driven photocatalytic performance in the oxidation degradation of Rhodamine B (RhB) in the presence of trace amounts of H 2 O 2 under visible light irradiation. The Fe(II)/Fe(III) cycle was accelerated by the transfer of the photogenerated electrons (e-) from UiO-66-NH 2 to Fe 3 O 4 , which in turn encouraged the Fenton reaction to produce hydroxyl radicals (•OH). With only 10 mmol/L H 2 O 2 , the removal rate of RhB approached 94% in 120 min. Furthermore, when exposed to visible light, Fe 3 O 4 @UiO-66-NH 2 exhibited 99% efficacious antibacterial activity against Escherichia coli and Staphylococcus aureus . Overall, the as-prepared Fe 3 O 4 @UiO-66-NH 2 core-shell nanospheres show promise for practical applications as photocatalysts for the degradation of organic pollutants and the inactivation of bacteria in wastewater.
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高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Mingying Ma,Tianhao Wu,Zhian Hu,Gongwei Sun,Sichun Zhang
High-throughput sample preparation is important in clinical mass spectrometry (MS) analysis. In this work, we developed a method by coupling Nano-ESI-MS with magnetic SPE using a MOF material, Fe 3 O 4 @UiO-66, as sorbent for simultaneous determination of testosterone (T) and androstenedione (4-AD) in serum samples. The proposed method presented good linearity in the range of 0.1–5 μg/L and the recoveries of serum samples were 90.7%-110.0% and 101.7%-108.7% for T and 4-AD, respectively. The results indicated that the Fe 3 O 4 @UiO-66 is an ideal sorbent for androgens extraction and the method is reliable for high-throughput quantitation of T and 4-AD in clinical applications.
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高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 24
·2423-2430
·
IF 3.532
Juan Du,Kai Liu,Jialei Liu,Dianbo Zhao,Yanhong Bai
Listeria monocytogenes (L. monocytogenes) is one of the most lethal pathogenic bacteria. Although the traditional microbial culture method has high sensitivity and selectivity for the diagnosis of L. monocytogenes, it is time-consuming and not suitable for on-site detection. A rapid, convenient and visualized on-site detection method is particularly needed. In this work, Fe3O4@UiO-66-NH2 was prepared for both magnetic separation and lateral flow immunoassay (LFIA) for the detection of L. monocytogenes by taking advantage of the easy separation of the magnetic core Fe3O4 and the high surface area of the outer layer UiO-66-NH2. Fe3O4@UiO-66-NH2 with a high surface area and good water-dispersibility and optical properties was synthesized by a simple hydrothermal process. It could directly adsorb on the surface of target bacteria and form Fe3O4@UiO-66-NH2-bacteria conjugates, without the labeling of an antibody. After magnetic separation and concentration, the Fe3O4@UiO-66-NH2-bacteria conjugates were detected by the antibody on the test line of the LFIA strip, resulting in a visible orange band. The capture efficiency and LFIA detection of Fe3O4@UiO-66-NH2 were optimized in this study. Under the optimal conditions, a good linear correlation between the test line intensity and the concentration of L. monocytogenes was obtained in the range of 105–108 CFU mL−1, and the limit of detection was 2.2 × 106 CFU mL−1 by the naked eye. The Fe3O4@UiO-66-NH2-based LFIA strip showed strong specificity for L. monocytogenes, and the detection took 45 min without culture enrichment. Therefore, the proposed Fe3O4@UiO-66-NH2-based strip showed the advantages of simple synthesis, being label-free, low cost, good selectivity and convenience.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 20
·9264-9273
·
IF 3.591
Chaowei Wang,Zhe Liu,Guangfa Hu,Ruimin Gao,Jianshe Zhao
In this study, the novel magnetic core–shell composites Fe3O4@UiO-66-HPA, consisting of magnetic Fe3O4@UiO-66 and vanadium-substituted Keggin-type heteropolyacid active species supported by Zr-MOF, were successfully prepared via a one-pot method and fully investigated using FT-IR, XRD, SEM, TEM, TEM-EDX, ICP, VSM and N2 adsorption–desorption isotherms. The synthetic composites were employed as catalysts in an ODS system of simulated fuel under oxygen. The catalyst Fe3O4@UiO-66-PW9V3 exhibits the supreme catalytic performance in this work, with sulfur removal of 99.85% and a TOF value of 31.16 h−1 under optimal reaction conditions (0.2 g catalyst mass, 60 °C reaction temperature, 500 rpm stirring speed, 1 L min−1 oxidant quantity and 180 min reaction time), and can also be recycled ten times without apparent loss of catalytic performance. Furthermore, the kinetic study shows that the ODS process accords with the pseudo-first-order model.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Chun-Yang Li,Jing-Min Liu,Zhi-Hao Wang,Shi-Wen Lv,Ning Zhao,Shuo Wang
Aflatoxins have been a hot topic in the field related into public health and ecosystem protection, and great effort has been made in developing of adsorptive materials for effective probing the target aflatoxins. Conventional materials, like metal-organic frameworks (MOFs) showed promising application in separation science. However, the cumbersome separation process, competitive adsorption are also major challenges. Regarding this, a novel magnetic micro-composite denoted as Fe 3 O 4 @UiO-66-NH 2 @MON with core-shell structure was constructed. The core of Fe 3 O 4 microspheres was coated with MOFs crystals, and then microporous organic network (MON) was introduced onto the surface of Fe 3 O 4 @UiO-66-NH 2 through a sonogashira coupling reaction. It exhibited good magnetic separation ability, which effectively simplified the pre-treatment steps. The proposed method possessed excellent selectivity and sensitivity, with detection limits in the range of 0.15-0.87 μg L −1 combination with HPLC analysis. More importantly, the MON coating significantly improved the hydro-stability of whole adsorbents, thus enhancing the adsorption efficiency and favoring the practical application of the materials. The developed Fe 3 O 4 @UiO-66-NH 2 @MON-based solid extraction method has been well-applied for real sample analysis, with the recovery of 87.3%–101.8%. We believe the newly-constructed hybrid nano-adsorbents hold great potential in further application in various analytical methods for different target analytes.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Xiaoyu Bai,Peng Liu,Xingtong Gao,Kai Liu,Aixiang Li,Zijian Lyu,Qiuhong Li
It is a major obstacle to further development of membrane technology that membrane fouling occurs. In this study, a novel Fe 3 O 4 @UiO-66-NH 2 /PVDF-co-CTFE mixed matrix membrane was successfully developed by mixing Fe 3 O 4 @UiO-66-NH 2 nanoparticles (NPs) into PVDF-co-CTFE membrane through a simple non-solvent-induced phase separation (NIPS) method, and was used for degradation of organic wastewater. The results of the incorporated Fe 3 O 4 @UiO-66-NH 2 NPs content on the morphology, pore structure and physicochemical structure of samples were investigated systematically. The results indicated that the Fe 3 O 4 @UiO-66-NH 2 NPs addition in membrane matrix improved the permeability and significantly enhanced the anti-fouling performance. When 2 wt% Fe 3 O 4 @UiO-66-NH 2 NPs was added, the mixed matrix membrane had excellent comprehensive performance, maintaining a high pure water flux of 226.8 L m −2 h −1 , the BSA rejection rate reached 95.9%, and the flux recovery rate was 71.38%. Importantly, the membrane possessed high catalytic performance based on the Fenton reaction mechanism, and the removal rate of 20 mg L −1 MB solution (400 mL) was up to 99.04%, and showed excellent self-cleaning characteristics and long-term stability. In conclusion, this study provided a new idea for the development of Fenton catalytic membranes with excellent anti-fouling performance for wastewater treatment in complex environments.
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