IOSR Journal of Environmental Science, Toxicology and Food Technology (IOSR-JESTFT) e-ISSN: 2319-2402,p- ISSN: 2319-2399.Volume 9, Issue 4 Ver. I (Apr. 2015), PP 08-20 www.iosrjournals.org DOI: 10.9790/2402-09410820 www.iosrjournals.org 8 | Page Comparative Study of Kinetics of Removal of Fuchsin Basic from Aqueous Solutions Using Biosorbents Satish Patil 1 , Jayesh Patil 2 , Naseema Patel 3 1,2 Department of Chemistry, A.P.ScienceCollege,Nagothane – 402106 (MS), India 3 Department of Chemistry, Yeshwant College, Nanded – 431602 (MS), India. Abstract: Adsorption studies of Fuchsin Basic (FB) on six different agricultural wastes / natural materials were carried out by batch experiments. The parameters studied include initial dye concentration, adsorbent dose, pH, agitation time, agitation speed, particle size of adsorbent and temperature. The best fitting isotherm models were found to be Langmuir and Temkin. The monolayer (maximum) adsorption capacities (q m ) were found between 166.667 to 250 mg/g for adsorbents under study. Among the kinetic models, Lagergen pseudo - second order model best fits the kinetics of adsorption. Intra particle diffusion plot showed boundary layer effect and larger intercepts indicates greater contribution of surface sorption in rate determining step. Adsorption was found to increase on increasing pH, increasing temperature, increasing agitation speed and decreasing particle size. Thermodynamic analysis showed negative values of free energy change indicating adsorption was favourable and spontaneous, small positive values below 40 KJ/mole of enthalpy change indicating endothermic physical adsorption and positive values of entropy change indicating increased disorder and randomness at the solid- solution interface of FB with biosorbents. Adsorption capacity of pineapple peel powder towards FB was found to be more than other adsorbents under study. Keywords:Adsorption isotherm, FuchsinBasic,biosorbents, kinetic and thermodynamic parameters. I. Introduction The discharge of synthetic dyes into wastewaters from the textile industries has raised much concern because of potential health hazards associated with entry of toxic components into the food chains of human and animals. Over 10,000 dyes with an annual production of over 7 × 10 5 metric tons worldwide are commercially available and 5–10% of the dye stuff is lost in the industrial effluents. The coloration of water by the dyes may have an inhibitory effect on photosynthesis, thus affecting aquatic eco-systems. Dyes may also be problematic if they are broken down anaerobically in the sediment as toxic amines which are often produced due to incomplete degradation by bacteria. Some of the dyes or their metabolites are either toxic or mutagenic and carcinogenic. The most popular treatment methods for textile wastewater are combinations of biological treatment, chemical coagulation and activated carbon adsorption [1-2]. Adsorption onto activated carbon is proven to be very effective in treating textile wastes. However, in view of the high cost and associated problems of regeneration, there is a constant search for alternate low cost adsorbents. Such types of adsorbents include coir pith [3], modified clays[4], oxihumolite [5]and fly ash [6]. In the present study removal of fuchsin basic from aqueous solution using some agricultural wastes / solids as adsorbents were investigated. II. Material And Methods 1.1 Adsorbent Adsorbents used in the present study are: 1. Pineapple (Ananascomosus) peel powder(PPP) 2. Mangrove plant (Sonneratiaapetala) fruit powder ( MPFP) 3. Coconut (Cocosnucifera)coir pith (CCP) 4. Mango (Mangiferaindica) leaf powder (MLP) 5. Toor plant (Pisumsativum) leaf powder ( TPLP) 6. Tamarind (Tamarindusindica) fruit shell powder (TFSP) Mature materials of all above biosorbents were collected from Konkan region of Maharashtra state in India and washed thoroughly with distilled water to remove dust and other impurities. Washed materials were dried for 10 days in sunlight. Dried materials were grounded in a domestic mixer- grinder after removing non required parts separately. After grinding, the powders were again washed and dried. Different sized powders of each adsorbent were sieved through Jayant’s sieves and stored in plastic bottle containers for further use.