Water purification using magnetic assistance: A review

Ambashta, Ritu D.; Sillanpää, Mika

doi:10.1016/j.jhazmat.2010.04.105

Cited by 847 publications

(339 citation statements)

References 183 publications

(163 reference statements)

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“…Ginet et al functionalized lipid-coated magnetic nanoparticles with a phosphohydrolase for the 6 degradation of the pesticide ethyl-paraoxon; the kinetic properties were comparable to the free enzyme [21]. Dendrimer-modified and plain magnetite nanoparticles (MNPs) have been extensively studied for their potential application in environmental decontamination, medicine and biology [22][23][24][25]. For example, MNP coated with receptor proteins or other functional molecules have found application in imaging and therapy [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

“…Grüttner et al reported MNPs functionalized with chelating groups on the surface to bind lanthanides and actinides in order to remove radionuclides from nuclear wastes [24]. Magnetically assisted processes have been reported to purify water [25] and MNPs have been proven useful in protein immobilization and purification and DNA extraction [23,29]. The main advantage of magnetite nanoparticles is that they can be easily recovered from the reaction media by magnetic separation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Immobilization of the enzyme GpdQ on magnetite nanoparticles for organophosphate pesticide bioremediation

Daumann

Larrabee

Ollis

et al. 2014

Journal of Inorganic Biochemistry

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Annually thousands of people die or suffer from organophosphate (pesticide) poisoning. In order to remove these toxic compounds from the environment, the use of enzymes as bioremediators has been proposed. We report here a Ser127Ala mutant based on the enzyme glycerophosphodiesterase (GpdQ) from Enterobacter aerogenes. The mutant, with improved metal binding abilities, has been immobilized using glutaraldehyde on PAMAM dendrimer-modified magnetite nanoparticles. The immobilized system was characterized using elemental analysis as well as infrared, transmission electron and X-ray photoelectron spectroscopies. The amount of GpdQ that was immobilized with the optimized procedure was 1.488 nmol per g MNP. A kinetic assay has been designed to evaluate the activity of the system towards organophosphoester substrates. The specific activity towards BPNPP directly after immobilization was 3.55 μmol mg -1 min -1 , after one week 3.39 μmol mg -1 min -1 and after 120 days 3.36 μmol mg -1 min -1 , demonstrating that the immobilized enzyme was active for multiple cycles and could be stored on the nanoparticles for a prolonged period.3

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Immobilization of the enzyme GpdQ on magnetite nanoparticles for organophosphate pesticide bioremediation

Daumann

Larrabee

Ollis

et al. 2014

Journal of Inorganic Biochemistry

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“…Magnetic Retrieval Modeling Methods : Capturing low‐volume particles dragged under realistic blood flow conditions is an extremely challenging problem17 that has been addressed in different fields ranging from water purification41 to magnetic separation systems for biological applications 42. Usually, filter‐like structures and/or huge magnetic field generation apparatus are employed to produce magnetic field values sufficient to overcome the flow drag force.…”

Section: Experimental Section and Methodsmentioning

confidence: 99%

An Intravascular Magnetic Catheter Enables the Retrieval of Nanoagents from the Bloodstream

et al. 2018

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The clinical adoption of nanoscale agents for targeted therapy is still hampered by the quest for a balance between therapy efficacy and side effects on healthy tissues, due to nanoparticle biodistribution and undesired drug accumulation issues. Here, an intravascular catheter able to efficiently retrieve from the bloodstream magnetic nanocarriers not contributing to therapy, thus minimizing their uncontrollable dispersion and consequently attenuating possible side effects, is proposed. The device consists of a miniature module, based on 27 permanent magnets arranged in two coaxial series, integrated into a clinically used 12 French catheter. This device can capture ≈94% and 78% of the unused agents when using as carriers 500 and 250 nm nominal diameter superparamagnetic iron oxide nanoparticles, respectively. This approach paves the way to the exploitation of new “high‐risk/high‐gain” drug formulations and supports the development of novel therapeutic strategies based on magnetic hyperthermia or magnetic microrobots.

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“…Among all of the existing techniques developed over the past years for water treatment, adsorption has been demonstrated to be one of the most effective and convenient approaches due to its simple operation and energy effectiveness 3. Usually, ideal adsorbents should possess the following features: perfect selectivity,4 multiple adsorbability,5 strong affinity,[[qv: 3c]],6 good reusability,5, 6, 7 no secondary pollution,5, 8 rapid kinetics,9 and high adsorption capacity. [[qv: 3c]] Although many adsorbents have been created, the ideal adsorbent is still to be discovered since some of these features are internally contradictory.…”

Section: Introductionmentioning

confidence: 99%

A Targeted “Capture” and “Removal” Scavenger toward Multiple Pollutants for Water Remediation based on Molecular Recognition

Wang

Shen

et al. 2015

Advanced Science

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For the water remediation techniques based on adsorption, the long‐standing contradictories between selectivity and multiple adsorbability, as well as between affinity and recyclability, have put it on weak defense amid more and more severe environment crisis. Here, a pollutant‐targeting hydrogel scavenger is reported for water remediation with both high selectivity and multiple adsorbability for several pollutants, and with strong affinity and good recyclability through rationally integrating the advantages of multiple functional materials. In the scavenger, aptamers fold into binding pockets to accommodate the molecular structure of pollutants to afford perfect selectivity, and Janus nanoparticles with antibacterial function as well as anisotropic surfaces to immobilize multiple aptamers allow for simultaneously handling different kinds of pollutants. The scavenger exhibits high efficiencies in removing pollutants from water and it can be easily recycled for many times without significant loss of loading capacities. Moreover, the residual concentrations of each contaminant are well below the drinking water standards. Thermodynamic behavior of the adsorption process is investigated and the rate‐controlling process is determined. Furthermore, a point of use device is constructed and it displays high efficiency in removing pollutants from environmental water. The scavenger exhibits great promise to be applied in the next generation of water purification systems.

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Water purification using magnetic assistance: A review

Cited by 847 publications

References 183 publications

Immobilization of the enzyme GpdQ on magnetite nanoparticles for organophosphate pesticide bioremediation

Immobilization of the enzyme GpdQ on magnetite nanoparticles for organophosphate pesticide bioremediation

An Intravascular Magnetic Catheter Enables the Retrieval of Nanoagents from the Bloodstream

A Targeted “Capture” and “Removal” Scavenger toward Multiple Pollutants for Water Remediation based on Molecular Recognition

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