Chromium Adsorption by Chitosan Impregnated with Microemulsion

Abstract

Removal of chromium(III) from aqueous solutions by chitosan impregnated with a microemulsion was investigated. The modified chitosan showed a remarkable increase in chromium sorption capacity as compared to an untreated sample. Dynamic column experiments were performed to study the influence of pH, concentration, and the presence of others metal ions (copper and nickel) in the chromium solutions. The adsorption process is pH-dependent, and the amount of Cr(III) retained increases with increasing heavy metal initial concentration. It can be observed that the best bed efficiency was for copper, followed by chromium and then nickel. The nature of chromium(III) adsorption equilibrium at different temperatures (30, 40, and 50 °C) was investigated, and the Freundlich and Langmuir isotherm models were applied to fit the experimental data. The uptake process obeys the Langmuir isotherm. Following the adsorption step, the desorption process was carried out using several eluant solutions. The best results were obtained using strongly acidic solutions as eluants.

Removal of Hg2+ from aqueous solution using alginate gel containing chitosan

“…5,6 Chitosan is a hydrophilic, natural cationic polymer formed by the N-deacetylation of chitin, 7 which is present in fungi, insects, and crustaceans. Chitosan has been known for its metal adsorption properties since 1970s, 7,8 and it has been shown to effectively remove metals such as silver, 8 cadmium, 9 arsenic, 10 gold, 11,12 vanadium, 13 copper, [14][15][16] nickel, 14,17 chromium, 14,18 and mercury 17,19 from aqueous solutions. It was reported that the maximum adsorption capacity of chitosan for Hg 2þ was 815 mg/g.…”

Use of microemulsions for removal of color and dyes from textile wastewater

“…Among the various new methods, the application of microemulsions is one of the most exciting and promising techniques 12 being used in separation, concentration and purification of proteins, extraction of metals, 13,14 adsorption of metals, 15,16 concentration of metals, 17 mineral flotation, 18 etc.…”

New Poly(aniline-co-o-phenylenediamine)/Kaolinite Microcomposites for Water Decontamination

“…One of these treatment techniques, sorption using convenient sorbents, is considered the extremely influential and economical method in relation to the simplicity of design and easiness of procedure. Tremendous concerted research efforts have been motivated to the development of new sorbents such as hydroxyapatite [24], activated carbon [23,25], chelating resin [26,27], clay [28,29], silica gel [30], zeolite [31], modified mineral sorbent [32], goethite [33], and certain polymer [34,35]. The extensively investigated sorbent is activated carbon with a great surface area, which is generated by heating carbon in the absence of air.…”