Immobilization of 2,2′-dipyridyl onto bentonite and its adsorption behavior of copper(II) ions

Erdem, Bilge; Özcan, Adnan; Gök, Özer; Özcan, Asiye Safa

doi:10.1016/j.jhazmat.2008.06.112

Cited by 86 publications

(33 citation statements)

References 49 publications

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“…where q e and q t are the amounts of metal ions adsorbed per unit mass (mg g -1 ) at equilibrium and at any time t, respectively, k is the rate constant for the adsorption process (g mg -1 min -1 ) [36].…”

Section: Pb(ii) Adsorptionmentioning

confidence: 99%

BENTONITE/IRON OXIDE MAGNETIC COMPOSITES: CHARACTERIZATION AND APPLICATION AS Pb(II) ADSORBENTS

Danková¹,

Fedorová²,

Bekényiová³

2017

AFST

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The natural clay bentonite (B) as adsorbent of lead cations was studied. To enhance its adsorption capacity, the coating by iron oxide particles, in two selected weight ratios: 2:1 (BM1) and 4:1(BM2), was used. The changes of the textural and surface parameters after the modification were studied by the low temperature nitrogen adsorption, XRD and SEM method, Mössbauer spectroscopy. The Pb(II) adsorption experiments were studied under the different conditions, such as pH of the model solutions, contact time and initial metal ion concentration. Higher adsorption rates of BM1 and BM2 samples were observed for lower initial metal ion concentrations.

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Section: Pb(ii) Adsorptionmentioning

confidence: 99%

BENTONITE/IRON OXIDE MAGNETIC COMPOSITES: CHARACTERIZATION AND APPLICATION AS Pb(II) ADSORBENTS

Danková¹,

Fedorová²,

Bekényiová³

2017

AFST

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“…These results indicate that the modification of natural bentonite by using HDTMA was accomplished. [2] …”

Section: Elemental Analysismentioning

confidence: 99%

“…In wastewater treatment processes such as adsorption, catalytic and rheologic applications, clays are the widely used raw materials because they are lowcost, effective, abundant and easily available materials, and have mostly high specific surface area and mechanical and chemical stability. [1,2] Bentonite is a clay material (2 : 1 type) consisting essentially of the montmorillonite group. The inner layer is composed of one octahedral alumina sheet placed between two tetrahedral silica sheets.…”

Section: Introductionmentioning

confidence: 99%

Preparation of HDTMA‐bentonite: Characterization studies and its adsorption behavior toward dibenzofuran

Erdem

Özcan

2010

Surface & Interface Analysis

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Bentonite is one of the most commonly used raw materials in the water treatment processes because of its low cost, easily availability and high mechanical and chemical stability. In this study, natural bentonite was modified with a large organic surfactant, which is hexadecyltrimethyl ammonium (HDTMA) bromide. The modified bentonite was called organobentonite. The surface characterization of natural bentonite and HDTMA-bentonite was examined by Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometry (XRD), Brunauer-Emmett-Teller (BET) and thermogravimetric (TG) analysis. FTIR spectroscopy showed the existence of HDTMA functional groups on bentonite surface. XRD results revealed randomly lateral-monolayer arrangements of the intercalated alkylammonium cation. The BET surface area significantly decreased after the modification due to the coverage of the pores of natural bentonite. Differences in the differential thermogravimetric (DTG) peaks for naturaland HDTMA-bentonite were observed and interpreted. HDTMA-bentonite was then tested as an adsorbent for the removal of organic compounds such as dibenzofuran (DBF) from aqueous solutions. The amount of adsorption for HDTMA-bentonite was found to be around 20 times higher than that of natural bentonite in 10 mg dm −3 DBF solution at 20• C. The adsorption kinetics of DBF onto HDTMA-bentonite was also studied at 20, 30 and 40• C and thermodynamic parameters were calculated. The overall adsorption process was exothermic and physical in nature. The results indicate that HDTMA-bentonite is an effective and a low-cost adsorbent for the removal of heterocyclic aromatic compounds such as DBF.

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“…At low pH values, hydronium ions have high concentration and more tendencies to be adsorbed, so hydronium ions are adsorbed more than Cd 2+ ions. 30,31 Hydronium ions concentration decreases with increasing pH, hence this decrease results in Cd 2+ ions being better and more adsorbed. [30][31][32] .…”

Section: Effect Of Phmentioning

confidence: 99%

“…30,31 Hydronium ions concentration decreases with increasing pH, hence this decrease results in Cd 2+ ions being better and more adsorbed. [30][31][32] . The reason of higher adsorption at higher pH values may also be that Cd 2+ interact with CB, RG and CR not only through the nitrogen and oxygen atoms by chelating, but also through -SO3H groups by cation-exchange, which is unprotonated at high pH.…”

Section: Effect Of Phmentioning

confidence: 99%

Cadmium Removal Performances of Different Dye Ligands Attached Cryogel Disks

Keleş¹,

Inanan²,

Tüzmen³

et al. 2015

Croat. Chem. Acta

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Abstract. Poly(HEMA) cryogel disks were synthesized by free radical polymerization of 2-hydroxyethylmethacrylate (HEMA), and then Cibacron Blue F3GA (CB), Reactive Green 19 (RG) and Congo Red (CR) were immobilized as dye ligands. Disks were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and swelling degree, porosity calculations. Cd 2+ adsorption experiments were performed for 60 min. Maximum adsorption capacities were determined as 25.5 mg/g; 48.0 mg/g and 28.5 mg/g at pH = 7.0 for poly(HEMA)-CB; poly(HEMA)-RG and poly-(HEMA)-CR, respectively. Langmuir isotherm fitted best with the adsorption data and adsorption thermodynamics showed that Cd 2+ adsorption is thermodynamically favorable and a physisorption process. A great majority of adsorbed Cd 2+ desorbed with 1 M NaCl and cryogel disks can be re-used in adsorption experiments. Cd 2+ removal efficiencies of disks from human plasma are approximately 45 %. Dyeattached cryogel disks synthesized in this study have potential in use for environmental and therapeutic applications.

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Immobilization of 2,2′-dipyridyl onto bentonite and its adsorption behavior of copper(II) ions

Cited by 86 publications

References 49 publications

BENTONITE/IRON OXIDE MAGNETIC COMPOSITES: CHARACTERIZATION AND APPLICATION AS Pb(II) ADSORBENTS

BENTONITE/IRON OXIDE MAGNETIC COMPOSITES: CHARACTERIZATION AND APPLICATION AS Pb(II) ADSORBENTS

Preparation of HDTMA‐bentonite: Characterization studies and its adsorption behavior toward dibenzofuran

Cadmium Removal Performances of Different Dye Ligands Attached Cryogel Disks

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