Removal of hexavalent chromium metal ions from aqueous solutions by adsorption using a novel organoclay | ||
| Al-Mustansiriyah Journal of Science | ||
| Article 1, Volume 27, Issue 3, July 2016, Pages 36-42 | ||
| Author | ||
| Mohammed Jasim M.Hassan | ||
| Abstract | ||
| A new method for the preparation of organoclay named porcelain-organoclay using Iraqi’s porcelain in the presence of hexadecyltrimethyl ammonium bromide as organic surfactant, for the first time is described. The method involves mixing kaolin with hexadecyltrimethylammonium (HDTMA) . Different techniques such as infrared spectroscopy, and x-ray diffraction were employed for the characterization of chemical structure of the prepared organoclay. Isotherm study of Cr (VI) on the surface of the prepared organoclay was evaluated by applying Langmuir, Freundlich and Temkin equations. The optimum conditions for the adsorption were: pH=1, temperature 15°C, stirring speed, 120 rpm, contact time, 60 min; adsorbent weight 0.1g, concentration of adsorbent, 50 ppm and total volume, 25mL. Under the optimum conditions, removal percentage of 99% for the adsorption of chromium ion (VI) was achieved. Isothermal adsorption of chromium ions from porcelain-organoclay surface was agreed with Langmuir isotherm rather than Temkin and Freundlich. The developed method was applied for the separation of mixture of Cr(VI) and Cr(III) using porcelain-organoclay surfaces and removal of chromate from different water samples i.e., tap water and river water (Tigris river) that collected from different areas of Baghdad. Good recoveries were obtained ranged from 95 to 99% and RSDs were <1.7%. | ||
| Keywords | ||
| organoclays; adsorption | ||
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