Starch-functionalized magnetite nanoparticles for hexavalent chromium removal from aqueous solutions

Singh, Pooja; Tiwary, Dhanesh; Sinha, Indrajit

doi:10.1080/19443994.2015.1061453

Cited by 20 publications

(4 citation statements)

References 89 publications

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“…The effect of various initial Cr(VI) concentrations (25,50,100,150 Fig 5. This result shows that when the initial Cr(VI) concentration increased from 25 to 200 mg/L, Cr(VI) removal efficiency rate decreased gradually and reached the equilibrium state by decreasing the number of vacant nano-porous reactive surface sites. Similar trends were also observed where the adsorption percentage was increased with decreasing initial contaminant concentrations [38][39][40]. Synthesis of nano-adsorbent produces large external surface area and suitable pore size with sufficient volume provided well contact efficiency with Cr(VI) ions.…”

Section: Effect Of Different Initial Cr(vi) Concentrations On Cr(vi) supporting

confidence: 72%

“…The effect of different absorbent concentrations (20, 35, 50, 100, 150 , 200, 250 and 300 mg/L) on the Cr(VI) removal from aqueous solution at pH solution of 3, 60 min of contact time, initial Cr(VI) concentration of 100 mg/L and agitation speed 200 rpm was performed in Fig 4. There are a few reports that the treated waste newspaper (TWNP) can be used for the removal of Cr(VI). The percentage of adsorbent increases by increase in the amount of adsorbent [39]. The reason of this process can be justified by increasing the accessibility of active vacant porous sites on the COOH@ NPG/Fe 3 O 4 surface for Cr(VI) adsorption.…”

Section: Effect Of Adsorbent Dosage On Cr(vi) Adsorption Onto Cooh@npmentioning

confidence: 99%

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Synthesis and characterization of magnetic nano-porous graphene functionalized with carboxyl for hexavalent chromium adsorption in aqueous solution

Fathi¹,

Kalantary²,

Rashidi³

et al. 2017

Desalination and Water Treatment

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a b s t r a c tIn the present study, magnetic nano-porousgraphene (NPG) was synthesized and functionalized with carboxyl (COOH) in order to fabricate a recoverable magnetic composite (COOH@NPG/Fe 3 O 4 ) as an adsorbent to remove hexavalent chromium (Cr(VI)) from aqueous solution. The synthesized adsorbent was also assimilated for higher efficiency and faster separation of pollutants from aqueous solutions. For magnetization of the adsorbent, nano-porousgraphene (NPG) was synthesized via chemical co-precipitation method and then functionalized with carboxyl (COOH). To minimize the adverse effects of magnetized nanoparticles, they can easily be separated by an external magnetic field. The morphological structure of adsorbent was characterized by several techniques (XRD, TEM, SEM, FTIR and VSM). The effect of various experimental parameters including solution pH, contact time, adsorbent dose, temperature and initial Cr(VI) concentrations was studied on the adsorption efficiency in batch experiments. The experimental equilibrium data had high correlation with the Langmuir isotherm and pseudo-second-order kinetic models, respectively. According to the obtained results of thermodynamic studies, the adsorption process was spontaneous and endothermic in nature and the adsorption process was optimum in higher temperature. The results suggested that COOH@NPG/Fe 3 O 4 has a good potential for Cr(VI) removal in contaminated-wastewater treatment. The adsorbent can easily be separated from aqueous solutions and thus does not impose any secondary pollution in the environment.

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Section: Effect Of Different Initial Cr(vi) Concentrations On Cr(vi) supporting

confidence: 72%

Section: Effect Of Adsorbent Dosage On Cr(vi) Adsorption Onto Cooh@npmentioning

confidence: 99%

Synthesis and characterization of magnetic nano-porous graphene functionalized with carboxyl for hexavalent chromium adsorption in aqueous solution

Fathi¹,

Kalantary²,

Rashidi³

et al. 2017

Desalination and Water Treatment

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“…Among these forms, Cr(VI), being a highly toxic heavy metal with solubility and carcinogenic properties [4,5], has been extensively reported to exist in diverse environments, causing significant harm to ecological security and human health. Conversely, Cr(III) generally exhibits lower solubility [6][7][8], resulting in less environmental damage. Therefore, the conversion of Cr(VI) into Cr(III) is considered an essential step for treating environmental chromium pollution [9].…”

Section: Introductionmentioning

confidence: 99%

Goethite Enhances Cr(VI) Reduction by S. oneidensis MR-1 under Different Conditions: Mechanistic Insights

Hou,

Li,

Wang

et al. 2024

Microorganisms

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Chromium (Cr) contamination, widely present in the environment, poses a significant threat to both ecology and human health. Microbial remediation technology has become a hot topic in the field of heavy metal remediation due to its advantages, such as environmental protection, low cost, and high efficiency. This paper focused on using various characterization and analysis methods to investigate the bioreduction effect and mechanism of microorganisms on Cr(VI) under various influencing factors. The main contents and conclusions were as follows: Shewanella oneidensis MR-1 was selected as the target strain for studying its reduction of Cr(VI) at different inoculation amounts, temperatures, pH values, time intervals, etc. The results indicated that S. oneidensis MR-1 exhibited an optimal reduction effect on Cr(VI) at pH 7 and a temperature of 35 °C. Additionally, electron shuttles (ESs), including humic acid (HA) and 9,10-antraquinone-2,6-disulfonate (AQDS), were introduced into the degradation system to improve the reduction efficiency of S. oneidensis MR-1. Upon adding goethite further, S. oneidensis MR-1 significantly enhanced its reducing ability by converting Fe(III) minerals to Fe(II) and reducing Cr(VI) to Cr(III) during electron transfer.

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“…When starch is combined with colloidal particles, the magnetic stability rises to various applications, such as gene delivery, drug delivery, magnetic resonance imaging, and tissue engineering. Due to its neutral free hydroxyl functional groups, it can bind to diverse chemical groups and ions and enhance surface activity [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Effective gene delivery using size dependant nano core-shell in human cervical cancer cell lines by magnetofection

Sundara Rajan R.,

Thomas,

Francis

et al. 2023

PLoS ONE

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Biocompatible magnetic nanoparticles are effective for gene delivery in vitro and in vivo transfection. These mediators are mainly used to deliver drugs and genes. It can also be used as probes to diagnose and treat various diseases. Magnetic nanoparticles, primarily iron oxide nanoparticles, are used in various biological applications. However, preparing stable and small-size biocompatible core-shell is crucial in site direct gene delivery. In the present study, superparamagnetic iron oxide nanoparticles were synthesized using the chemical co-precipitation method and were functionalized with starch to attain stable particles. These SPIONs were coated with polyethylenimine to give a net positive charge. The fluorescent plasmid DNA bound to the SPIONs were used as a core shell for gene delivery into the HeLa cells via magnetofection. UV-Visible Spectrophotometry analysis showed a peak at 200 nm, which confirms the presence of FeO nanoparticles. The Scanning Electron Microscopy images revealed the formation of spherical-shaped nanoparticles with an average size of 10 nm. X-ray Diffraction also confirmed FeO as a significant constituent element. Vibrating Sample Magnetometry ensures that the nanoparticles are superparamagnetic. Atomic Force Microscopy images show the DNA bound on the surface of the nanoparticles. The gene delivery and transfection efficiency were analyzed by flow cytometry. These nanoparticles could effectively compact the pDNA, allowing efficient gene transfer into the HeLa cell lines.

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Starch-functionalized magnetite nanoparticles for hexavalent chromium removal from aqueous solutions

Cited by 20 publications

References 89 publications

Synthesis and characterization of magnetic nano-porous graphene functionalized with carboxyl for hexavalent chromium adsorption in aqueous solution

Synthesis and characterization of magnetic nano-porous graphene functionalized with carboxyl for hexavalent chromium adsorption in aqueous solution

Goethite Enhances Cr(VI) Reduction by S. oneidensis MR-1 under Different Conditions: Mechanistic Insights

Effective gene delivery using size dependant nano core-shell in human cervical cancer cell lines by magnetofection

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