Dyes adsorption on plant materials and silica for evaluating their toxic effects on plant soil and water

Abstract

The organic dye pollution directly affects the soil water and plants newlineEffluents from the dyeing and dye manufacturing industries are the newlineimportant sources of water pollution Adsorption is the most commonly newlineused technique for the removal of various pollutants from wastewater newlineHowever no literatures were reported for the study of toxic effects newlineof dyes on plant soil and water Hence in the present investigation the newlineremoval of cationic and anionic dyes from aqueous solution by batch newlineadsorption technique is studied to evaluate their toxic effect on plant soil newlineand water newlineIn this study different adsorbents such as saw dust cellulose newlinetomato plant root powder cellulose brinjal plant root powder cellulose newlinegreen carbon and silica are used to determine the adsorption efficiency of newlinecommonly used cationic dyes and anionic dyes The influences of newlineadsorption condition are optimized to attain maximum adsorption to newlineevaluate the toxic effect of the dyes to plant soil and water are as follows newlineThe equilibrium adsorption time dye concentration temperature newlinepH adsorbent dosage are optimized for anionic and cationic dyes to newlineachieve maximum adsorption Adsorption isotherms like Langmuir and newlineFreundlich are studied to evaluate the mono layer adsorption capacity newlineand the number of layers respectively newlineAnionic and cationic dyes adsorptions are followed the pseudo newlinesecond order kinetics newlineThe thermodynamic parameters like AG° AH° and AS° are studied to newlineevaluate the temperature effect on adsorption newlineThe dyes recovery study is carried out to understand the affinity of newlinedyes with the adsorbents newlineBased on the above studies the cationic dyes are chemisorbed on newlineplant materials and soil Hence these cationic dyes are found to be toxic newlineto a maximum extent on plant and soil newlineThe above investigation confirmed that the anionic dyes are newlinephysisorbed on the plant materials and soil Moreover the anionic dyes newlineare more affinity towards water than soil and plants Hence the anionic newlinedyes are polluting water to a maximum extent newline