Removal of chromate anions by micellar-enhanced ultrafiltration using cationic surfactants

Gzara, Lassâad; Dhahbi, Mahmoud

doi:10.1016/s0011-9164(01)00225-9

Cited by 179 publications

(80 citation statements)

References 25 publications

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“…A similar result was presented on chromate removal in a lower MWCO membrane (10 KD) in the previous study [13]. It was reported that in UF the rejected modified starch are accumulated near the membrane surface increasing its concentration higher than in the bulk solution [14], [15]. It eventually enhances the metal ions removal.…”

Section: G Effect Of the Retentate Pressuresupporting

confidence: 84%

Modified Starch–Enhanced Ultrafiltration for Chromium (VI) Removal

Racho¹,

Phalathip²

2014

JOCET

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Abstract-With increasing concerns about environmental protection are being made to develop biodegradable starch-based materials using in pollutant treatment, particularly for heavy metals removal. This study was investigated on two cross-linkages of modified starch including amino and carboxyl as the sorbents to remove hexavalent chromium from aqueous solution. The overall resulted showed that only amino crosslinking starch was effective on Cr (VI) chemisorption. The carboxyl crosslinking and non-modified starch were showed too poor adsorption performances. The pH of the aqueous solutions is an important controlling parameter in the heavy metal adsorption processes. The highest efficiency was achieved in acidic condition about pH 5. However, modified starch is an organic material so it can be contaminated in the effluent. The ultrafiltration was used to separate modified starch from the effluent for sufficiently treatment. Also the operating conditions of modified starch enhanced ultrafiltration for chromium (VI) removal were evaluated in this study.Index Terms-Modified starch, chemisorptions, heavy metal removal.

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Section: G Effect Of the Retentate Pressuresupporting

confidence: 84%

Modified Starch–Enhanced Ultrafiltration for Chromium (VI) Removal

Racho¹,

Phalathip²

2014

JOCET

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“…Surfactants have been used in enhancing membrane filtration for the removal of metal ions in aqueous solutions due to their high selectivity properties [26,27]. Taking into account previous reports, the support impregnation was carried out with different surfactants and eo dye.…”

Section: Study Of Zn (Ii)-eo System: Support and Surfactant Selectionmentioning

confidence: 99%

“…Particularly, micellar enhanced separation method have been extensively studied for removal of heavy metals and organic pollutants by using ultrafiltration membranes [26][27][28]. Additionally, the feasibility of realizing chemical separation processes without polluting solvents has turned to surfactant organized media in a very attractive strategy.…”

Section: Introductionmentioning

confidence: 99%

Surfactant Enhanced Chemofiltration of Zinc Traces Previous to Their Determination by Solid Surphase Fluorescence

Vega¹,

Augusto²,

Talio³

et al. 2011

AJAC

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Surfactant enhanced chemofiltration on Nylon membranes pre-treated with hexadecyltrimethylammonium bromide (HTAB) and eosin dye (eo) is proposed for zinc traces quantification by solid surphase spectrofluorimetry (SSF, λ exc = 532 nm; λ em = 548 nm). Operational variables which have influence on quantitative retention of metal complex have been studied and optimized. At optimal experimental conditions, quantitative recovery was reached with a detection limit of 0.662 pg·L -1 and quantification limit of 2.20 pg·L -1 . The calibration sensitivity was of 1.22 L·pg -1 for the new methodology with a linear range of 2.20 pg·L -1 to 779 pg·L -1 Zn (II). The tolerance levels of potential interfering ions were studied with good results. Recuperation studies were carried out by standard addition method applied to natural water samples (San Juan, Argentine) without previous treatment. The reproducibility (between-days precision) was also evaluated over 3 days by performing five determinations each day. CV% was 0.37. The performing obtained in sensitivity and selectivity thanks to chemofiltration step, converts the proposed methodology in an adequate alternative to conventional techniques for Zn (II) traces determination.

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“…Chromium salts are used in many industries such as leather, electroplating, dye and textiles and these industries produce effluent containing large amount of chromium (high toxic) in different salt forms (Cr(III), Cr(VI)) (Gzara and Dhahbi, 2001). Chromium(VI) is recognized to be much more toxic than Cr(III).…”

Section: Introductionmentioning

confidence: 99%