Abstract: The aim of the present investigation was to develop metal adsorbent from agro-waste (husk) of tur dal (Cajanus cajan) for their value addition and to improve the effectiveness of developed adsorbent by optimizing the conditions of adsorption for complete removal of Cu ions from its 50 ml, 50 ppm solution. The washed and dried tur dal husk was carbonized in air tight container at 500 0C for 1 hr. to get its carbon form possessing adsorption property. The physicochemical characterization of prepared adsorbent was done for yield, bulk density, conductivity, particle size, moisture, ash, water soluble content, pH, calorific value, trace elements, crystal nature and structural morphology. The optimum parameters for adsorption was studied by varying pH (2-10), agitation speed (50-250 rpm), temperature (10-60 0C), adsorbent dose (0.25- 2.75 g) and contact time (0.5-4 hr.). The study concludes tur dal husk can be exploited for the preparation of metal adsorbent. The prepared adsorbent was found to be most effective in an adsorption condition of 6 pH, 150 rpm agitation speed, 60 0C temperature, 2.75g adsorbent dose and 3 hr. contact time. The thermodynamic study revealed adsorption by the developed adsorbent was endothermic (positive 0 H ), non spontaneous (positive 0 G ) and increasing randomness at the adsorption sites (positive 0 S ).
Keywords: Adsorption, copper, optimization, thermodynamic, tur dal husk
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