Effluents from the dyeing and finishing processes in the textile industry are known to contain color and high amount of surfactants . From an environmental point of view, the removal of synthetic dyes is of great concern, since some of the dyes and their degradation products may be carcinogens and toxic and, consequently, their treatment cannot depend on bio-degradation alone . Hence the removal of dyes from dye house effluent has become an important aspect of textile waste water treatment.Among the waste water treatment processes, ‘adsorption’ is the most widely used one [3, 4]. The removal of triphenyl methane dye namely, Acid violet (AV) using animal charcoal has been studied by batch adsorption experiments. The effect of various experimental parameters like initial concentration of dye, contact time, dose of adsorbent and initial pH on the extent of removal of dye were investigated by measuring the change in the optical density of the dye solution at 545nm.The percentage removal of dye (70-92%) by adsorption on animal charcoal decreases with the increase in initial concentration (90-150ppm) of dye, which is due to the lack of available active sites. It was found that the extent of removal of dyes by adsorption on animal charcoal increases with increase in contact time (10-70 min) and increase in dose of adsorbent (0.8-3.2 gL-1). The percentage of removal of dye decreased with the increase in the initial pH (1.1-4.6) of dye solution. The acidic pH is favorable for the removal of AV by animal charcoal. Langmuir and Freundlich isotherm models were found to be applicable in the present case. It has been suggested that the monolayer adsorption of dyes occurs on the surface of the adsorbent.
|Keywords:||Wastewater Treatment, Textile Industry, Acid Violet Dye|
Faculty, Department of Inorganic Chemistry, School of Chemical Sciences, University of Madras, Chennai, Tamil Nadu, India
Research Scholar, Department of Inorganic Chemistry, School of Chemical Sciences, University of Madras, Chennai, Tamil Nadu, India
Postgraduate department of Chemistry, Ayya Nadar Janaki Ammal College, India
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