Abatement of free chlorine from water using kaolinite clay

Solid sheets of kaolinite clay exhibit a good affinity towards deduction of free chlorine and hence rectifying water. Initially, results of chlorine abatement by inactivated kaolinite sheets show a lower uptake percent. As far as the samples are activated the uptake percent of chlorine increases given high values according to the initial concentration of free chlorine. Dipping time of the sample on water as well as the firing temperatures used for preparing the kaolinite samples are significant factors for the chlorine uptake percent. Through the entire results, the uptake mechanism of free aqueous chlorine by kaolinite clay is based on sorption. The sorption includes physical adsorption (Freundlich isotherm) and absorption due to the pores in sample surface. As far as sorption takes place, the surface plays an outstanding effect for decomposition of HOCl either by catalytic effect of some cations already present in kaolinite structure or by redox effect.