Batch and Fixed-Bed Column Studies of Arsenic Adsorption on the Natural and Modified Clinoptilolite

Baskan, Meltem Bilici; Pala, Ayşegül

doi:10.1007/s11270-013-1798-4

Cited by 26 publications

(7 citation statements)

References 32 publications

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“…): from 9 to 86% (SAP, soil 1), 14 to 79% (SAP, soil 2), 19 to 80% (TA, soil 1), and 11 to 88% (TA, soil 2). This is in contrast to a report using modified clinoptilolite to remove As from water where the sorption was lower at higher As concentrations . The authors wrote that this is because at high arsenate concentrations, modified clinoptilolite has energetically less favorable sites.…”

Section: Resultscontrasting

confidence: 61%

Fe‐modified Clinoptilolite is Effective to Recover Plant Biosurfactants Used for Removing Arsenic From Soil

Gusiatin

2015

CLEAN Soil Air Water

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The aim of this study was to determine the effect of the biosurfactant concentration, pH, and extraction time on arsenic (As) removal from brownfield soils by saponin (SAP), and tannic acid (TA). Sandy loam (soil 1) and silt loam (soil 2) soils containing 7598.4 and 4294.2 mg As/kg, respectively, were tested. After washing, the effluents were treated with clinoptilolite modified with FeCl 3 and then their ability to remove As was compared with the control biosurfactant solutions. Removal of As increased gradually as SAP and TA concentration increased (0.005-5%). Arsenic was more efficiently removed under acidic (pH 2-3) than alkaline conditions (pH 9-11). The distribution of As in soils affected the length of extraction time. A pseudo-second-order kinetic model gave a good fit for kinetic data for both biosurfactants. The efficiency of As removal depended on the soil and biosurfactant type. Under optimized conditions (3% SAP and TA, pH 3, 24 h extraction), As removal from soil 1 and 2 was 27 and 46% with SAP and 5 and 39% with TA, respectively. Modified clinoptilolite at a dosage of 300 g/L removed !80% of As from SAP and TA effluents. Although the reused biosurfactants did not extract As as effectively as the original solutions, pH adjustment improved their effectiveness.

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Section: Resultscontrasting

confidence: 61%

Fe‐modified Clinoptilolite is Effective to Recover Plant Biosurfactants Used for Removing Arsenic From Soil

Gusiatin

2015

CLEAN Soil Air Water

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“…Both natural and synthetic clinoptilolite modified have been studied for sorption of pollutants in recent years [17][18][19][20]. To improve the zeolite performance, e.g., adsorption capacity and increased mechanical and resistance to chemical environment, several modification June, 2015 methods including iron modification [4], surfactant modification [21], and lanthanum modification have been used [6,22].…”

Section: Introductionmentioning

confidence: 99%

A comprehensive study (kinetic, thermodynamic and equilibrium) of arsenic (V) adsorption using KMnO4 modified clinoptilolite

Massoudinejad

Asadi

Niri

et al. 2015

Korean J. Chem. Eng.

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The sorption of As(V) on manganese oxide coated zeolite (MOCZ) was investigated through batch study to explore the feasibility of removing arsenic from groundwater. MOCZ was characterized by scanning electron microscopy, XRD, FTIR spectroscopy, and point of zero charge (pH PZC ) measurements. The effects of process parameters such as contact time, adsorbent size, temperature and pH were investigated. Arsenic detection was carried out by atomic fluorescence spectrometer. Arsenate adsorption onto MOCZ followed the pseudo-second-order kinetic model with a correlation coefficient more than 0.99. Optimum removal of arsenate occurred within pH range of 6-10. The equilibrium data were analyzed by Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models. The maximum adsorption capacity calculated from the Langmuir and D-R models was 151 and 152.8 μg g −1 , respectively, at 38 o C. The activation energy of adsorption (E a ) was found to be 3.68 kj mol −1 , suggesting that the adsorption process may be physical sorption. Thermodynamic parameters: ΔH o , was 1.181 kj mol −1 ; ΔS o , was −0.29 kj mol −1 , while the values of ΔG o were −83.9, −86.7 and 89.8 kj mol −1 at 18, 28 and 38, respectively, suggesting endothermic and spontaneous process and a rise in temperature favoring the adsorption.

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“…The results imply that the probable modified reaction is ion exchange and tetrahydroxoaluminate can combine with hydroxyapatite, which in turn suggests that aluminum ion can be impregnated onto the surface of the bone charcoal. In future study, more attention deserves to be paid to the adsorption of lead and arsenic as some advanced researches provide great inspirations on the topic [46,[52][53][54][55].…”

Section: Resultsmentioning

confidence: 99%

Infrared Spectroscopic Study on the Modified Mechanism of Aluminum-Impregnated Bone Charcoal

Yang

et al. 2014

Journal of Spectroscopy

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Fluoride contamination in drinking water is a prominent and widespread problem in many parts of the world. Excessive ingestion of fluoride through water can lead to the high risk of fluorosis in human body. Bone charcoal, with the principal active component of hydroxyapatite, is a frequently used adsorbent for fluoride removal. Many laboratory experiments suggest that the aluminum-impregnated bone charcoal is an effective adsorbent in defluoridation. However, the mechanisms underlying this modification process are still not well understood, which in turn greatly impedes the further studies on other different modified adsorbents. To address this issue, we used the infrared spectroscopy to examine the bone charcoal and the aluminum-impregnated bone charcoal, respectively. The comparative results show that the −OH peak of infrared spectroscopy has been intensified after modification. This significant change helped speculate the modified mechanism of the aluminum-impregnated bone charcoal. In addition, it is found that the hydroxide ion dissociates from hydroxyapatite in the modification process. Such finding implies that the tetrahydroxoaluminate can be combined with the hydroxyapatite and the aluminum ion can be impregnated onto the bone char surface.

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Batch and Fixed-Bed Column Studies of Arsenic Adsorption on the Natural and Modified Clinoptilolite

Cited by 26 publications

References 32 publications

Fe‐modified Clinoptilolite is Effective to Recover Plant Biosurfactants Used for Removing Arsenic From Soil

Fe‐modified Clinoptilolite is Effective to Recover Plant Biosurfactants Used for Removing Arsenic From Soil

A comprehensive study (kinetic, thermodynamic and equilibrium) of arsenic (V) adsorption using KMnO4 modified clinoptilolite

Infrared Spectroscopic Study on the Modified Mechanism of Aluminum-Impregnated Bone Charcoal

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