Browsing by Author "Jayahansani, K.H.D."

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    Arsenic Removal from Water Using Humic Acid Modified Meetiyagoda Kaolinite
    (Uva Wellassa University of Sri Lanka, 2013) Jayahansani, K.H.D.
    Kaolinite is one of the major clay types which can be used to remove ions from the water by using its adsorption capacity. Though Sri Lanka is blessed with several clay types, none of them are used for value addition purposes. By considering that fact and the unique ability which possesses by kaolinite to remove ions from water when it is in contact with water is focused throughout this research. Meetiyagoda kaolinite is used as clay type, because it is currently used only as a raw material for ceramic industry as well as none of the researches has been conducted to identify its ability to remove ions from water. Thus, the ultimate goal of this research is to fill up that gap and to develop a value added product from Meetiyagoda kaolinite. Throughout this research it focused on removing Arsenic (V) from water while modifying kaolinite surface using Humic Acid in order to enhance the adsorption capacity of kaolinite and measuring the removal amount of arsenic (V) by changing amount of clay, concentration of arsenic (V) and pH. With increasing of arsenic concentration, arsenic adsorption on to humic acid modified Meetiyagoda kaolinite has increased whereas increasing of amount of humic acid modified Meetiyagoda kaolinite in solution, the adsorption has decreased. The highest sorption has gained when pH was in 6.0.
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    Removal of Arsenic (V) in Water using Humic Acid-Modified Meetiyagoda Kaolinite
    (Uva Wellassa University of Sri Lanka, 2013) Jayahansani, K.H.D.; Udagedra, D.T.; Weerasooriya, R.
    Kaolinite is one of the major clay types which can be used to remove ions from the water by using its adsorption capacity (Krishna and Gupta, 2006). Though several clay types are found in Sri Lanka, significant use of them for value addition purposes is not practiced.By considering that fact and the unique ability of kaolinite to remove ions from water is targeted throughout this research.Meetiyagoda kaolinite is used as clay type, because it is currently used only as a raw material for ceramic industry and none of the researches have been conducted to investigate its ability to remove ions from water. Therefore the ultimate goal of this study is to fill that gap and develop a value added product from Meetiyagodakaolonite. This research focuses on removing arsenic (V) from water while modifying kaolinite surface using Humic Acid in order to enhance its adsorption capacity and measuring the removal amount of arsenic (V) by changing amount of clay, concentration of arsenic (V) and pH. Methodology The purified Meetiyagoda kaolinite sample was taken from Meetiyagoda clay refinery and it was dried, ground and sieved to obtain 75µmparticle size.This particle size was preferred because, when particle size gets smallest it increases the surface area of kaolinite which results in more adsorption of arsenic on to kaolinite surface. Humic acid was prepared by mixing dried homo-ionized clay was prepared using kaolinite and 1M CaCl2.Previously prepared humic acid was readjusted to homo-ionized clay was added to pH neutral humic acid and the humic acid-clay suspension was incubated in mechanical shaker, then the suspension was centrifuged. Finally the humic acid coated clay sample was dried and used. The effect of arsenic removal by humic acid modified Meetiyagoda kaolinite was analysed while changing amount of humic acid modified clay, initial arsenic concentration and pH of the solution using Varian 700ES ICP-OES Atomic Absorption Spcetrophotometer.