Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 366, Issue 1-3, Pages 170-177Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2010.06.009
Keywords
Bio-surfactant; Layered double hydroxide; PAH; Rhamnolipid; Sorption; Surfactant
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Funding
- National Science Council, Taiwan [NSC 91-2313-B-002361, 92-2313-B-002-090, 93-2313-B-002-008]
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Chemical surfactants or bio-surfactants intercalated into layered double hydroxides (LDHs) are considered as potential organic pollutant sorbents. This study evaluates the effects of (1) using either calcined or uncalcined LDH, and various solid/solution ratios, (2) the concentrations of the chemical surfactant sodium dodecyl sulfate (SDS) or the bio-surfactant rhamnolipid (RL). and (3) reaction temperatures and times on the synthesis of SDS-LDH and RL-LDH. Small angle X-ray diffraction (SAXRD) and X-ray diffraction (XRD) patterns reveal that using 1000 mg L-1 RL intercalated 2:1 uncalcined LDH with 3 days reaction time, 0.5 g L-1 solid/solution ratio, and temperature of 65 degrees C to synthesize the RL-LDH, containing more organic carbon content, showing larger interlayer distance than SDS-LDH. RL-LDH shows subsequent higher efficiency of naphthalene sorption than SDS-LDH, depending on higher organic carbon contents and larger interlayer distance of RL-LDH. Since RL-LDH is environmentally friendly chemical, these results are of practical interesting in RL-LDH could be potentially employed as a sorbent for removal organic contaminants from aqueous solutions, and particularly in optimizing aquatic environment remediation technologies. (C) 2010 Elsevier B.V. All rights reserved.
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