The adsorption capacity of bio adsorbent, prepared from Hyptissuaveolens (VilaytiTulsi), for Rhodamine 6G removal from aqueous solution was investigated in the present study. The effect of ph, initial dye concentration, time, adsorbent dosage and temperature was investigated. The present adsorption follows pseudo second order kinetics. Langmuir isotherm and Freundlich isotherm was used for present study. The maximum adsorption capacity under optimum condition was found to be 48.78 mg g-1. The thermodynamics study shows endothermic, spontaneous adsorption process.
Keywords: Rhodamine 6G, Adsorption, Dye removal, Bio adsorbent.
Additivity rule is found applicable to the Temperature of Maximum Density (TMD) behavior of strong electrolytes. For the first time a systematic attempt was made to divide Despretz constant Km of an electrolyte into its individual ionic contributions using partial molal expansivity of a proton, E .The large and positive deviations in ionic Km of R4N+ cations proved their well-known structure strengthening ability, corroborating satisfactorily with their structure promoting nature found from measurements of many thermodynamic properties. Despretz rule was found to obey for some amino acids. TMD Study by 1) acoustical technique, 2) Convective flow technique and 3) under pressure is also studied.
Keywords: TMD, Despretz rule, electrolytes solution, water structure, Hopes apparatus.