Metal organic framework-based magnetic solid phase extraction of pesticides in complex matrices
TL;DR: A review of magnetic solid phase extraction (MSPE) of pesticide residues in complex matrices is presented in this article, where different types of magnetic MOFs have been used by researchers during MSPE pre-concentration of pesticides in complex matrix.
About: This article is published in Microchemical Journal.The article was published on 2021-12-01. It has received 12 citations till now.
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TL;DR: In this paper , the most recent and exceptional applications of magnetic adsorbents for preconcentration and removal purposes were investigated in terms of preparation procedures, limitations, advantages, and interactions between pollutants and magnetic composites.
10 citations
TL;DR: In this paper , a new poly (ionic liquid)s functionalized magnetic adsorbent (PFMA) was conveniently fabricated by means of "one-pot" strategy, and the preparation procedure was quite simple by mixing 1-allyl-3-methylimidazoliumbis[(trifluoromethy)sulfonyl]imide, ethylene glycol dimethacrylate, Fe3+, Fe2+, mixed solution of dimethyl sulfoxide/H2O and azobisisobutyronitrile in one pot.
7 citations
TL;DR: The applications of stimuli-responsive metal-organic frameworks (MOFs) during environmental remediation are discussed in detail in this article , and challenges associated with the use of smart MOFs during the remediation of polluted environments are discussed as well as their future prospects.
Abstract: The applications of stimuli-responsive metal-organic frameworks (MOFs) during environmental remediation are discussed in detail in this paper. MOFs are highly porous materials with generally high adsorption capacity of environmental pollutants. The incorporation of stimuli-responsive moieties in their structures confer them with additional properties such as being easily recovered and recyclability. Consequently, there is an increase in the use of stimuli-responsive MOFs during environmental remediation. Some researchers have successfully incorporated photoactive species into the structures of MOFs resulting in the formation of light-responsive composites. The presence of thermo-responsive polymeric units in the structure of an MOF make it to have physicochemical properties that are sensitive to temperature changes. The recovery of MOFs composites can be facilitated by the incorporation of magnetic nanoparticles into their structures. This review explores the utilisation of thermo-responsive MOFs, light-responsive MOFs and magnetic responsive MOFs during environmental remediation. In addition, challenges associated with the use of smart MOFs during the remediation of polluted environments are discussed in detail in this review as well as their future prospects.
4 citations
TL;DR: Combination of carbon nano onions-based dispersive solid phase extraction with deep eutectic solvent based dispersive liquid-liquid microextraction was utilized for the extraction of some pesticides from fruit juice and vegetable samples as discussed by the authors .
3 citations
TL;DR: In this paper , the use of smart cellulose composites during the remediation of wastewater is discussed and a detailed discussion of the applications of these cellulose adsorbents during wastewater remediation is given in this review.
Abstract: This paper explores the use of smart cellulose composites during the remediation of wastewater. Smart cellulose composites have physicochemical properties that change in a reversible manner in response to stimuli such as pH, temperature, light and oxidizing/reducing agents. Some of the smart cellulose composites undergo chain collapse/extension, precipitation, swelling or de-swelling in response to stimuli alterations. These changes have direct influence on adsorption and desorption properties of the stimuli-responsive cellulose composites as well as their hydrophilicity. Some researchers have successfully used pH-responsive cellulose composites during wastewater remediation. Their adsorption and desorption processes can be easily regulated by changing the pH of the bulk solution. Thermo-responsive polymers, with physicochemical properties that respond to temperature changes, have also been used during decontamination of wastewater. CO2-responsive cellulose adsorbents have also proved to be vital during remediation of water. Their adsorption sites are generated when CO2 is bubbled through them. Other researchers have successfully used light- and redox-responsive cellulose composites to decontaminate water. Light-responsive cellulose composites have photo-active species embedded into their structures while redox-responsive cellulose adsorbents have moieties that are susceptible to oxidation or reduction. The stimuli responsiveness of these various types of cellulose composites also facilitates their recovery from the bulk solution after the remediation process. They can be easily recovered by just altering the stimuli conditions. This makes them to be recyclable and environmentally friendly adsorbents during water remediation. A detailed discussion of the applications of these smart cellulose adsorbents during wastewater remediation is given in this review as well as the challenges faced and the future prospects.
2 citations
References
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TL;DR: Study of the gas adsorption and thermal and chemical stability of two prototypical members, ZIF-8 and -11, demonstrated their permanent porosity, high thermal stability, and remarkable chemical resistance to boiling alkaline water and organic solvents.
Abstract: Twelve zeolitic imidazolate frameworks (ZIFs; termed ZIF-1 to -12) have been synthesized as crystals by copolymerization of either Zn(II) (ZIF-1 to -4, -6 to -8, and -10 to -11) or Co(II) (ZIF-9 and -12) with imidazolate-type links. The ZIF crystal structures are based on the nets of seven distinct aluminosilicate zeolites: tetrahedral Si(Al) and the bridging O are replaced with transition metal ion and imidazolate link, respectively. In addition, one example of mixed-coordination imidazolate of Zn(II) and In(III) (ZIF-5) based on the garnet net is reported. Study of the gas adsorption and thermal and chemical stability of two prototypical members, ZIF-8 and -11, demonstrated their permanent porosity (Langmuir surface area = 1,810 m 2 /g), high thermal stability (up to 550°C), and remarkable chemical resistance to boiling alkaline water and organic solvents.
5,512 citations
TL;DR: In this paper, a highly porous metal coordination polymer [Cu3(TMA)2(H2O)3]n (where TMA is benzene-1,3,5-tricarboxylate) was formed in 80 percent yield.
Abstract: Although zeolites and related materials combine nanoporosity with high thermal stability, they are difficult to modify or derivatize in a systematic way. A highly porous metal coordination polymer [Cu3(TMA)2(H2O)3]n (where TMA is benzene-1,3,5-tricarboxylate) was formed in 80 percent yield. It has interconnected [Cu2(O2CR)4] units (where R is an aromatic ring), which create a three-dimensional system of channels with a pore size of 1 nanometer and an accessible porosity of about 40 percent in the solid. Unlike zeolites, the channel linings can be chemically functionalized; for example, the aqua ligands can be replaced by pyridines. Thermal gravimetric analysis and high-temperature single-crystal diffractometry indicate that the framework is stable up to 240 degreesC.
5,061 citations
TL;DR: In this article, the authors present an extended cationic framework constructed from a single crystal isolated from the reaction mixture, which is shown to be stable in air and is insoluble in water and common organic solvents.
Abstract: The great importance of microporous solids such as zeolites in adsorption, ion exchange, and shape-selective catalysis has stemmed from their ability to reversibly bind molecules and ions within their extended channels.' Recently, a major research effort has focused on using the molecular building block approach to generate analogous materials with 3-D organic? metal-~rganic,~ and inorganic4 frameworks. Strategies for the construction of these solids have respectively utilized hydrogenbonding interactions, metal-ligand coordination, and metalcluster copolymerization reactions to link their molecular components. A number of such frameworks have been found to exhibit desirable zeolitic properties such as stability and microporosity of the f r a m e w ~ r k , ~ ~ . ~ guest e x ~ h a n g e , ~ ~ , ~ and selective catalytic activityS6 In this report we present hydrothermal synthesis as a route to accessing crystalline, metal-organic, open frameworks having extended channel systems and composed of uncommon metal coordination. This will be demonstrated by describing the synthesis, structure, and properties of the extended network in crystalline Cu(4,4'-bpy)1 .s*NO~(HZO)I.Z~. A mixture of Cu(NO3)2*2.5H20 (0.17 g, 0.74 mmol), 4,4'bpy (0.17 g, 1.1 1 mmol), and 1,3,5-triazine (0.040 g, 0.49 \"01) in 15 mL of deionized water was transferred to a stainless steel bomb, which was sealed and placed in a programmable fumace. The temperature was raised to 140 \"C at 5 deglmin and held at that temperature for 24 h, then cooled at 0.1 deglmin to 90 OC and held for 12 h, then cooled at the same rate to 70 \"C and held for another 12 h, and finally cooled down to room temperature at 0.1 deglmin. The resulting rectangular parallelepiped orange crystals of Cu(4,4'-bpy), .5*N03(H20)1.25 were collected and washed with deionized water (3 x 5 mL) and ethanol (2 x 5 mL) and then air dried to give 0.25 g (87% yield based on b p ~ ) . ~ , ~ This compound is stable in air and is insoluble in water and common organic solvents. X-ray structure determination9 on a single crystal isolated from the reaction mixture was performed to reveal an extended cationic framework constructed from the building unit shown in Figure 1. Here, symmetry equivalent and slightly distorted trigonal planar copper(1) centers (N7-Cu-N1 = 125.4(2)\", N13a-Cu-N1 = 125.7(2)\", and N13a-Cu-N7 = 108.5(2)\")
1,464 citations
TL;DR: A zeolitic imidazolate framework (ZIF-8) as member of the metal-organic framework family has been crystallized as a thin porous layer on an asymmetric ceramic support that can be selected from other gases by molecular sieving.
Abstract: A zeolitic imidazolate framework (ZIF-8) as member of the metal−organic framework family has been crystallized as a thin porous layer on an asymmetric ceramic support. Hydrogen can be selected from other gases by molecular sieving.
1,068 citations
TL;DR: Both functionalized ZIFs retained high crystallinity and in addition ZIF-91 maintained permanent porosity (surface areas: 1070 and 1010 m2 g(-1)).
Abstract: A new crystalline zeolitic imidazolate framework, ZIF-90, was prepared from zinc(II) nitrate and imidazolate-2-carboxyaldehyde (ICA) and found to have the sodalite-type topology. Its 3D porous framework has an aperture of 3.5 A and a pore size of 11.2 A. The pores are decorated by the aldehyde functionality of ICA which has allowed its transformation to the alcohol functionality by reduction with NaBH4 and its conversion to imine functionality by reaction with ethanolamine to give ZIF-91 and ZIF-92, respectively. The N2 adsorption isotherm of ZIF-90 shows a highly porous material with calculated Langmuir and BET surface areas of 1320 and 1270 m2 g−1. Both functionalized ZIFs retained high crystallinity and in addition ZIF-91 maintained permanent porosity (surface areas: 1070 and 1010 m2 g−1).
650 citations