Cadmium removal from aqueous solution by green synthesis zero valent silver nanoparticles with Benjamina leaves extract

Al-Qahtani, Khairia M.

doi:10.1016/j.ejar.2017.10.003

Cited by 96 publications

(21 citation statements)

References 22 publications

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“…The study of Al-Qahtani aimed at synthesizing zero-valent silver nanoparticles to remove Cd from aqueous solution [154]. Ag-nanoparticles were prepared using AgNO 3 and an extract of Ficus benjamina leaves.…”

Section: Phytoremediation Nanoparticles and Microbial Fermentation Against Cadmium Toxicitymentioning

confidence: 99%

The Effects of Cadmium Toxicity

Genchi

Sinicropi

Lauria

et al. 2020

IJERPH

1,433

602

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Cadmium (Cd) is a toxic non-essential transition metal that poses a health risk for both humans and animals. It is naturally occurring in the environment as a pollutant that is derived from agricultural and industrial sources. Exposure to cadmium primarily occurs through the ingestion of contaminated food and water and, to a significant extent, through inhalation and cigarette smoking. Cadmium accumulates in plants and animals with a long half-life of about 25–30 years. Epidemiological data suggest that occupational and environmental cadmium exposure may be related to various types of cancer, including breast, lung, prostate, nasopharynx, pancreas, and kidney cancers. It has been also demonstrated that environmental cadmium may be a risk factor for osteoporosis. The liver and kidneys are extremely sensitive to cadmium’s toxic effects. This may be due to the ability of these tissues to synthesize metallothioneins (MT), which are Cd-inducible proteins that protect the cell by tightly binding the toxic cadmium ions. The oxidative stress induced by this xenobiotic may be one of the mechanisms responsible for several liver and kidney diseases. Mitochondria damage is highly plausible given that these organelles play a crucial role in the formation of ROS (reactive oxygen species) and are known to be among the key intracellular targets for cadmium. When mitochondria become dysfunctional after exposure to Cd, they produce less energy (ATP) and more ROS. Recent studies show that cadmium induces various epigenetic changes in mammalian cells, both in vivo and in vitro, causing pathogenic risks and the development of various types of cancers. The epigenetics present themselves as chemical modifications of DNA and histones that alter the chromatin without changing the sequence of the DNA nucleotide. DNA methyltransferase, histone acetyltransferase, histone deacetylase and histone methyltransferase, and micro RNA are involved in the epigenetic changes. Recently, investigations of the capability of sunflower (Helianthus annuus L.), Indian mustard (Brassica juncea), and river red gum (Eucalyptus camaldulensis) to remove cadmium from polluted soil and water have been carried out. Moreover, nanoparticles of TiO2 and Al2O3 have been used to efficiently remove cadmium from wastewater and soil. Finally, microbial fermentation has been studied as a promising method for removing cadmium from food. This review provides an update on the effects of Cd exposure on human health, focusing on the cellular and molecular alterations involved.

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Section: Phytoremediation Nanoparticles and Microbial Fermentation Against Cadmium Toxicitymentioning

confidence: 99%

The Effects of Cadmium Toxicity

Genchi

Sinicropi

Lauria

et al. 2020

IJERPH

1,433

602

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“…Several adsorbents have been applied to remove mercury ions such as clays, silica, carbon nanotubes, polymers and activated carbons [18, 19, 20, 21, 22, 23]. The nanosized metals or metal oxides have received great attention as adsorbents in water remediation due to their higher performance and lower cost than traditional old materials [24]. The nanomaterials have not only high surface area and hence high density of active sites per unit mass, but also high surface free energy, resulting in enhanced surface reactivity [25, 26, 27].…”

Section: Introductionmentioning

confidence: 99%

Silver/quartz nanocomposite as an adsorbent for removal of mercury (II) ions from aqueous solutions

El-Tawil

El‐Wakeel

Abdel-Ghany

et al. 2019

Heliyon

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Silver nanoparticles (AgNPs) and silver/quartz nanocomposite (Ag/Q)NPs)) were synthesized by sol-gel method using table sugar as chelating agent. The synthesized nanosized materials were used for mercury ions adsorption from aqueous solutions. The materials were characterized by X-ray diffraction (XRD), Transmission Electron microscope (TEM), and surface area (BET). Adsorption of Hg2+ (10 mg/l) is strongly dependent on time, initial metal concentration, dose of adsorbent and pH value. Silver/quartz nanocomposite ((Ag/Q)NPs)) shows better efficiency than individual silver nanoparticles (AgNPs). This composite removed mercury ions from the aqueous solution with efficiency of 96% at 60 min with 0.5g adsorbent dosage at pH 6. The adsorption process explained well by the pseudo-second-order kinetic model. In conclusion silver/quartz nanocomposite (Ag/Q)NPs)) shows higher removal efficiency for mercury ions from aqueous solutions than individual silver naoparticles (AgNPs) or quartz (Q).

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“…Therefore, mass transfer from a mass solution to binding sites is affected by contact time. 9 Adsorption is linear for R L = 1 and it is irreversible if R L = 0. In this analysis, the separation factor R L is 0.844, which explains the favorable adsorption process for removal of Cr(VI).…”

Section: Influence Of Contact Timementioning

confidence: 99%

Adsorptive Removal of Chromium (VI) Using Silver Nanoparticles Synthesized Via Green Approach with the Extract of Moringastenopetala

Tagesse

2021

Orient. J. Chem

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In the current study, the potential sorption of Cr (VI) ions through a zero-valent silver nanoparticle synthesized by a green approach has been studied. The objective of this research was to remove Cr (VI) from aqueous solution using zero-valent silver nanoparticles synthesized from Moringa stenopetala leaves extract. The synthesized silver nanoparticles were characterized using X-ray diffractometer and UV-visible spectrophotometer. The grain size of nanoparticles was found to be 19.5 nm confirming the crystalline structure of the mesosphere and showed the maximum absorption at 419 nm. In order to determine parameters that influence the adsorption mechanism, batch adsorption experiments have been conducted. Results obtained for removal of Cr (VI) ions showed that efficiency of removal improved as adsorbent dosage increased until the equilibrium point reached at 50 minutes. However, as the pH of the solution increased from 1 to 8, and as the Preliminary concentration of Cr increased, removal efficiency decreased. Adsorption isotherms were investigated by applying the models of Langmuir and Freundlich. The Freundlich isotherm can better explain the removal of Cr (VI) ions, offering correlation coefficient values greater than the Langmuir isotherm model. Adsorption kinetics regression results studied by the pseudo-first and second-order models moreover proved that a pseudo-first-order was further accurately represented by the adsorption kinetics. In order to alleviate wastewater problems, the implementation of this approach is able to cost-effective, eco-friendly and publicly viable. To improve its removal effectiveness and compare it with other adsorbents, additional study on surface modification of this adsorbent is required.

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Cadmium removal from aqueous solution by green synthesis zero valent silver nanoparticles with Benjamina leaves extract

Cited by 96 publications

References 22 publications

The Effects of Cadmium Toxicity

The Effects of Cadmium Toxicity

Silver/quartz nanocomposite as an adsorbent for removal of mercury (II) ions from aqueous solutions

Adsorptive Removal of Chromium (VI) Using Silver Nanoparticles Synthesized Via Green Approach with the Extract of Moringastenopetala

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