Removal of cationic dye ''Crystal Violet'' in aqueous solution by the local clay

The work described herein was undertaken in order to respond to a major environmental challenge that is water pollution and its impacts on receiving media,especially those arising from industrial effluents. our focus was particularly directed on the textile industry which releases sizeable amounts of wastewater loaded with toxic pollutants. in the course of this project we were able to develop a wastewater treatment method which turned out to be effective,affordable and easily implementable. though various water treatments already exist,they each have their own set of disadvantages,for example adsorption over activated carbon which in spite of being effective,remains costly and generates a sludge posing by itself an environmental threat. in this perspective,the use of natural material such as clay (at) from the taounate area as an adsorbent is appealing since the efficient,inexpensive and readily available. effect of the physicochemical conditions of the medium (stirring speed,temperature,ph,concentration and contact time) as well as properties of the adsorbent materials in terms of thermodynamics,kinetics and adsorption isotherms were all investigated. once compared with adsorption models,our results enabled us to describe this adsorption as a process being spontaneous,endothermic and having pseudo-second ordre kinetics when tests were conducted with dies such as crystal violet (cv). the adsorption isotherm data were well described by the langmuir models. © 2017,university of mohammed premier oujda morocco.