International Journal of Latest Technology in Engineering & Management (IJLTEM) www.ijltem.com || ISSN: 2456-1770 || | Volume 1 | Issue 3 | |pAGE| 13 | Application of Teak Sawdust as an Adsorbent for Removal of Hazardous Acid Blue-7 Dye from Aqueous Phase Kapil Malviya 1 , Dr. Charu Parashar 2 , Dr. Savita Dixit 3 , Dr. Suneet Kaur 4 Abstract: The equilibrium adsorption isotherms and kinetics study behaviours of acidic dye adsorption onto teak sawdust from aqueous solution were investigated. Acid Blue-7 dye was selected for removal. The equilibrium adsorption isotherms and kinetics study parameters of dye adsorption were examined with a batch system by changing various experimental parameters (e.g. initial concentration of dye, pH, adsorbent dosage, contact time, temperature). The Acid Blue-7 removal ratios came up to the maximum value found at pH 10. The 800 mg teak sawdust could almost completely remove Acid Blue- 7 dye 200 mg/L of dye solution. The adsorption percentages of Acid Blue-7 dye was 39.82% over a range 10 mg/L of dye concentration when 800 mg/L of teak sawdust was used. The isothermal data followed the Tempkin model. The adsorption processes has been described by the pseudo-first-order kinetic and pseudo-second-order kinetic models. Keywords : Acid Blue-7, Contact Time, Teak sawdust, Tempkin, Harkins-Jura. I. Introduction Industrial effluents, agricultural leachate and chemicals are the major sources of waste discharges into the water bodies [1]. Effluents from industries contain several recalcitrant substrates, which gives hazardous effect to the flora and fauna of receiving water body [2]. In recent years, dyes industries have growing very rapidly. Especially textile wastewaters have contained dyes with complex and highly varied chemical structures. Even very low concentrations of the dyes also gives visibility, elimination of these types of components from wastewater are very complicated [3]. Some dyes effluents are carcinogenic, mutagenic and tartrogenic in nature. Hance, basic and conventional methods of wastewater treatment are continuously being modified and studied to remove these wastewaters [4]. Many of methods are applied for the separation and recovering colour from aqueous solution which include adsorption [5], electrocoagulation [6], ultrafiltration [7], membrane separation [8] and phyto extraction [9]. A number of materials are being used as adsorbents for colour removal like rice husk [10], sawdust [11], fly ash [12] and powdered activated carbon [13], agricultural and agro-processing wastes [14] etc. II. Materials And Method Materials A. Preparation of dye solution: Acid Blue-7 dye was used without any purification. A calculated amount of dye was dissolved in 500 ml distilled water solution, this solution is the stock solution. From these stock solution, five samples of dye solution in the range of (10 – 50) mg/l were analysed. The of Acid Blue-7 dye is 543 nm. B. Preparation of Adsorbent : Teak Sawdust was washed with distilled water and kept in oven at 50˚C for 24 hrs. After drying, the adsorbent was milled and sieved at different particle sizes such as (300-150) μ, (150-75) μ and <75 μ. These sieved adsorbent were kept in plastic pouches to prevent the moisture. These sieved adsorbent were used in this study. C. Equilibrium Contact Time : The effect of contact time on the removal of Acid Blue-7 by teak sawdust at concentrations are 10, 20, 30, 40 and 50 mg/l is given in Fig. 1. The contact time curves show rapid adsorption of Acid Blue-7 in the beginning time, thereafter, the adsorption rate decreased slowly and the adsorption reached equilibrium in 180 mins (optimum contact time). Increase in contact time up to 600 mins showed that the Acid Blue-7 removal remained constant over those obtained for optimum contact time.