چكيده به لاتين
Abstract:
Colors are an important sources of water pollution. There are several methods for removal of colours from aqueous solutions. Among theme adsorption is a simple process and will be affordable if a low cost adsorbent used. In this study the possibility of processing and modifying of titanomagnetite concentrate as an adsorbent for romval basic dye has been studied. According to the observations after the processing underalkaline leachingcondition using sodium hydroxide and then modifying with anionic surfactant sodium dodecyl sulfate (SDS), the mineral will be able to remove cationic dyes like crystal violet from aqueous solutions. In the processing and modifying steps statical Taguchi design was used. Factors such as the concentration of SDS, sodium hydroxide concentration, temperature, the ratio of solid to liquid phase and time were considered. The optimal conditions for was SDS of 6mM, NaOH of 9M, temperature of 160° C, ratio of solid to liquid phase of 4 gr/100ml and 24 hours for time of the process.In batch optimization studies, the maximum removal efficiency of 99.21% was obtained for crystal violet at the optimum levels of pH 2, contact time 60 min, adsorbent dosage 1g/L and initial dye concentration 20.The optimum conditions was applied for adsorption of two other cationic dye malachite green and Methylene blue. In these conditions efficiency of93.24and 98.31% was achieved respectively. The Pseudo-second order model had the best agreementwith the obtained data. Dye adsorption equilibrium data were fitted well to the Freundlich isotherm.
Keywords:
titanomagnetite concentrate, Cationic dye, surface modification, adsorption,alkaline leaching
