Nanotechnology for water treatment: A green approach

Patanjali, P. K.; Singh, R. P.; Kumar, Amit; Chaudhary, Pratibha

doi:10.1016/b978-0-08-102579-6.00021-6

Cited by 33 publications

(11 citation statements)

References 146 publications

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“…On the other hand, a T 2 behavior involves a long-range magnetic interaction with water molecules that it is caused by the magnetic field that a superparamagnetic core is able to induce under an applied magnetic field [ 52 ]. In GbMNPs hybrids, the observed shortening in the transverse relaxation time ( T 2 ) [ 4 ] comes from the MNPs counterpart, since the graphene component does not exhibit intrinsic paramagnetism or superparamagnetism [ 53 , 54 , 55 ]. Some GbMNPs combinations [ 39 ] show transverse relaxivity ( r 2 ) values superior to those of commercial iron oxide contrast agents Feridex ® ( r 2 = 130 m M −1 s −1 , at 3T, 37 °C) [ 56 ] and Resovist ® ( r 2 = 200 m M −1 s −1 , at 3T, 37 °C) [ 57 ], both superparamagnetic iron oxide NPs approved by FDA.…”

Section: Graphene-based Magnetic Nanoparticles For Theranosticsmentioning

confidence: 99%

Graphene-Based Magnetic Nanoparticles for Theranostics: An Overview for Their Potential in Clinical Application

et al. 2021

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The combination of diagnostics and therapy (theranostic) is one of the most complex, yet promising strategies envisioned for nanoengineered multifunctional systems in nanomedicine. From the various multimodal nanosystems proposed, a number of works have established the potential of Graphene-based Magnetic Nanoparticles (GbMNPs) as theranostic platforms. This magnetic nanosystem combines the excellent magnetic performance of magnetic nanoparticles with the unique properties of graphene-based materials, such as large surface area for functionalization, high charge carrier mobility and high chemical and thermal stability. This hybrid nanosystems aims toward a synergistic theranostic effect. Here, we focus on the most recent developments in GbMNPs for theranostic applications. Particular attention is given to the synergistic effect of these composites, as well as to the limitations and possible future directions towards a potential clinical application.

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Section: Graphene-based Magnetic Nanoparticles For Theranosticsmentioning

confidence: 99%

Graphene-Based Magnetic Nanoparticles for Theranostics: An Overview for Their Potential in Clinical Application

et al. 2021

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“…The large specific surface area increases the adsorption capacity and adsorption on contaminant nanoparticles, facilitating their transport into cells (Karakoti et al, 2012). Nanomaterials are effective, inexpensive, and environmentally friendly alternatives to existing processing materials because they provide high efficiency and excellent characteristics such as high reaction rate and sur-face to mass ratio (Patanjali et al, 2019). Due to their small size, metal nanoparticles easily penetrate the body through the respiratory system, digestion, skin, overcome the biological barriers (hepatocellular, histochemical, placental), bind to nucleic acids and proteins, are embedded in cell membranes, penetrate into organelles with changes in their functions and exhibit more pronounced biological activity due to their large surface area per unit mass (Diegoli et al, 2008).…”

Section: Characterization Of Nanoparticlesmentioning

confidence: 99%

“…Biosynthesized NPs pave the way for diverse applications of nanotechnology Such "bionanofactories" are accessible to unique structures, are environmentally efficient, and have a high selective ability to absorb individual elements (Honary et al, 2012;Barabadi et al, 2017;Emmanuel et al, 2017). Compared to conventional approaches, biosynthetic NPs are better applied in different industries, in particular in drinking water treatment (Mekkawy et al, 2017;Patanjali et al, 2019). Toxic chemicals produced by nanoparticle synthesis can be metabolized by enzymes contained in microbiota and plants.…”

Section: Characterization Of Nanoparticlesmentioning

confidence: 99%

“…NPs synthesized by bacteria without high-temperature treatment or additional of chemicals have many unique properties. Due to their biocompatibility and stability, they are a real alternative to the physical and chemical methods traditionally used in catalysis (Jiang et al, 2018;Patanjali et al, 2019).…”

Section: Fig 2 General Scheme Of Synthesis Of Nanoparticles Of Metamentioning

confidence: 99%

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Bacterial synthesis of nanoparticles: A green approach

et al. 2020

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In recent decades, the attention of scientists has been drawn towards nanoparticles (NPs) of metals and metalloids. Traditional methods for the manufacturing of NPs are now being extensively studied. However, disadvantages such as the use of toxic agents and high energy consumption associated with chemical and physical processes impede their continued use in various fields. In this article, we analyse the relevance of the use of living systems and their components for the development of "green" synthesis of nano-objects with exceptional properties and a wide range of applications. The use of nano-biotechnological methods for the synthesis of nanoparticles has the potential of large-scale application and high commercial potential. Bacteria are an extremely convenient target for green nanoparticle synthesis due to their variety and ability to adapt to different environmental conditions. Synthesis of nanoparticles by microorganisms can occur both intracellularly and extracellularly. It is known that individual bacteria are able to bind and concentrate dissolved metal ions and metalloids, thereby detoxifying their environment. There are various bacteria cellular components such as enzymes, proteins, peptides, pigments, which are involved in the formation of nanoparticles. Bio-intensive manufacturing of NPs is environmentally friendly and inexpensive and requires low energy consumption. Some biosynthetic NPs are used as heterogeneous catalysts for environmental restoration, exhibiting higher catalytic efficiency due to their stability and increased biocompatibility. Bacteria used as nanofactories can provide a new approach to the removal of metal or metalloid ions and the production of materials with unique properties. Although a wide range of NPs have been biosynthetic and their synthetic mechanisms have been proposed, some of these mechanisms are not known in detail. This review focuses on the synthesis and catalytic applications of NPs obtained using bacteria. Known mechanisms of bioreduction and prospects for the development of NPs for catalytic applications are discussed.

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“…4,5 Another relevant area is environment, in which nanotechnology has been used in green water treatment to remove pesticides, pathogens, and heavy metals, improving the water quality. 6,7 Once the optics, magnetics, and electronics properties depend of the size and shape of the nanomaterial 8 , it is possible to synthesize materials with specific features for biomedical application such as biological sensors, diseases treatment, medical imaging. In this sense, more sensitive detectors and nanodevices have been developed allowing both early diagnosis and diseases treatments.…”

Section: Introductionmentioning

confidence: 99%

Multitherapeutic nanoplatform based on Scintillating Anthracene, Silver@Antracene, and Gold@Anthracene nanoparticles for combined radiation and photodynamic therapies: enhancing radiation dose while generating, trapping, probing, or delivering singlet oxygen species

Oliveira¹

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We have synthesized anthracene and metal@anthracene core-shell nanoparticles and propose that they be used as a nanoplatform that combines radiation and photodynamic therapies. Synthesis of anthracene nanoparticles in the presence of colloidal silver or gold reduced the hydrodynamic radius in a concentration-dependent manner and caused core-shell nanostructures to grow, as revealed by AFM and DLS. Besides reduced size, the core-shell nanoparticles presented enhanced fluorescence emission.Fluorescence enhancements were higher for Ag@anthracene nanoparticles and for wavelengths approaching the plasmon resonance peak, which suggested a plasmon-enhancement phenomenon. The size-dependent enhancement in fluorescence associated with the distance between the metal core and the surface area of the nanoparticles provided an optimal core-shell diameter of 100-150 nm. We investigated singlet oxygen ( 1 O2) generation by electron spin resonance spectroscopy (ESR) with a spintrap and by fluorescence spectroscopy. The ESR/spin-trap results revealed that, in the presence of a porphyrin, anthracene nanoparticles and the core-shell nanoparticles acted as energy mediators for 1 O2 generation under exposure to light. Fluorescence suppression experiments showed that the core-shell nanoparticles captured 1 O2 at higher rates because they presented smaller size and larger surface area than anthracene nanoparticles. Together, the ESR and fluorescence results suggested that overall production of 1 O2 ( 1 O2 captured by spin-trap + 1 O2 captured by surface anthracene molecules) was higher for the core-shell nanoparticles than for anthracene nanoparticles. Moreover, because of plasmon-enhanced fluorescence and larger surface area, the Ag@anthracene nanoparticles stood out as a new and more sensitive fluorescent probe for 1 O2. During irradiation with X-rays, both anthracene and Ag@anthracene nanoparticles trapped 1 O2; subsequently, they afforded sustained release of the trapped 1 O2 for up 12 days after irradiation. This could be an interesting strategy to extend the radiation therapy treatment after the irradiation sessions. Furthermore, the presence of the metallic nanoparticle in the core of the core-shell nanostructure increased interaction with X-rays, raising the radiation dose around xii the nanoparticle. Therefore, metal@anthracene nanostructures may allow cancer treatment by different approaches depending on nanoparticle configuration.

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Nanotechnology for water treatment: A green approach

Cited by 33 publications

References 146 publications

Graphene-Based Magnetic Nanoparticles for Theranostics: An Overview for Their Potential in Clinical Application

Graphene-Based Magnetic Nanoparticles for Theranostics: An Overview for Their Potential in Clinical Application

Bacterial synthesis of nanoparticles: A green approach

Multitherapeutic nanoplatform based on Scintillating Anthracene, Silver@Antracene, and Gold@Anthracene nanoparticles for combined radiation and photodynamic therapies: enhancing radiation dose while generating, trapping, probing, or delivering singlet oxygen species

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