Heavy Metals Removal Using Activated Carbon, Silica and Silica Activated Carbon Composite

Karnib, Mona; Kabbani, Ahmad; Holail, Hanafy; Olama, Zakia A.

doi:10.1016/j.egypro.2014.06.014

Cited by 470 publications

(172 citation statements)

References 17 publications

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“…The ligands or molecules attached to the surface of a nanoparticle not only passivate the more active surface atoms but also help particles stay away from each other. There are numerous protecting groups that have been used in the preparation of silver nanoparticles such as thiols [15], tiopronin [16], citrate [17], PVP [18], polyvinyl alcohol (PVA) [19], gluconic acid [20], and polyethylene glycol (PEG) [21]. These ligands may be either charged, neutral or sometimes zwitterionic.…”

Section: Introductionmentioning

confidence: 99%

Preparation of nano-silver-supported activated carbon using different ligands

2015

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In this study, we investigated the effect of water soluble ligands [i.e., sodium borohydride (NaBH 4 ), polyvinyl alcohol, glucose and galactose] on the preparation of nano-silver-supported activated carbon (AC). Ligand-stabilized Ag nanoparticle dispersion characteristics were also compared with those of ligand-free Ag nanoparticles. The nanoparticle distribution was investigated using a scanning electron microscope (SEM) which enabled a qualitative analysis of ligand-dependent nanoparticle adsorption onto AC. Silver nanoparticles with average sizes ranging from 7 to 20 nm were synthesized with different coatings. In particular, silver nanoparticles reduced and stabilized by NaBH 4 were found to have a dense and homogenous dispersion of sizes in the range of 100-400 nm on the AC surface. These particles also seemed to remain on the AC surface after rinsing with water. The distribution of silver nanoparticles prepared in the presence of NaBH 4 /PVA was not as good as the one prepared with NaBH 4 . Their aggregate size varied from 300 to 600 nm on the AC surface and particles greater than 500 nm were eliminated from the AC surface upon rinsing with water. Glucose-and galactose-stabilized silver nanoparticles did not display an extensive adsorption and their adsorption seemed to be poor. However, glucose-stabilized silver nanoparticles could still be detectable to some extent after rinsing, while galactose-stabilized ones could not. Antimicrobial studies showed that all silver-containing carbons studied in this study inhibit bacterial growth and act as bacteriostatic agents.

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Section: Introductionmentioning

confidence: 99%

Preparation of nano-silver-supported activated carbon using different ligands

2015

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“…Several waste materials are reported to be good adsorbents [15][16]. Activated carbon is especially favored due to its inert nature [17][18]. In this study, activated carbon derived from scrap rubber tyres is used as an adsorbent for the removal of Cr 3+ from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting the Adsorption of Trivalent Chromium Ions by Activated Carbon Prepared from Waste Rubber Tyres

Benjamin¹,

Sajjid²

2017

Adv. sci. technol. eng. syst. j.

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“…Huge numbers of adsorbents have been reported in several recent studies including activated carbon [10][11][12][13][14][15], synthetic polymers [16][17][18][19] and silica-based adsorbents [20]. These types of adsorbents suffer from intra-particle diffusion which decreases the adsorption rate due to the size of adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Use of Hydrous Manganese Oxides Nanopowders as a Potential Sorbent for Selective Removal of Nickel Ions from Industrial Waste Water, Kinetics and Isotherm Studies

Ghaniem¹

2016

AJCHE

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Hydrous Manganese Oxides Nanopowders as nano adsorbent (MONs) was synthesized and characterized by Xray diffraction (XRD), scanning electron microscopy (SEM), and transform infrared spectroscopy (FT-IR). The adsorption of Ni (II) ions from aqueous solution on the MONs was investigated with variations in contact time, pH, initial Ni (II) concentration and adsorbent dosage. The results showed that the adsorption of Ni (II) onto MONs increased within 25 min and reached equilibrium gradually and removal percentage were 83%, 57%, 42% and 35% for 25 ppm, 50 ppm, 75 ppm and 100 ppm Ni (II), respectively, by using 1g/l MONs for 90 min at pH 6. The adsorption behavior of Ni (II) onto MONs was best described by the pseudo-second-order model and Freundlish isotherm. The results also indicated that the type of adsorption involved in this study is physiosorption (physical sorption) which usually takes place at low temperature. The results also revealed that MONs was a promising adsorbent for removal of Ni ions from industrial wastewater.

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Heavy Metals Removal Using Activated Carbon, Silica and Silica Activated Carbon Composite

Cited by 470 publications

References 17 publications

Preparation of nano-silver-supported activated carbon using different ligands

Preparation of nano-silver-supported activated carbon using different ligands

Factors Affecting the Adsorption of Trivalent Chromium Ions by Activated Carbon Prepared from Waste Rubber Tyres

Use of Hydrous Manganese Oxides Nanopowders as a Potential Sorbent for Selective Removal of Nickel Ions from Industrial Waste Water, Kinetics and Isotherm Studies

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