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|標題:||Comparison and characterization of chemical surfactants and bio-surfactants intercalated with layered double hydroxides (LDHs) for removing naphthalene from contaminated aqueous solutions||作者:||Chuang, Y.H.
|關鍵字:||Bio-surfactant;Layered double hydroxide;PAH;Rhamnolipid;Sorption;Surfactant;polyaromatic hydrocarbons;dodecyl-sulfate;mg-al;hydrotalcite;adsorption;sorption;biosurfactant;organoclay;complexes;mg-al-co3||Project:||Colloids and Surfaces a-Physicochemical and Engineering Aspects||期刊/報告no：:||Colloids and Surfaces a-Physicochemical and Engineering Aspects, Volume 366, Issue 1-3, Page(s) 170-177.||摘要:||
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.
|Appears in Collections:||土壤環境科學系|
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