Adsorption Studies on Chromium (VI) removal from Aqueous Solution using Activated Hibiscus sabdariffa Stem Nano Carbon P.Manivannan 1 , S.Arivoli 2 , S.Raja Mohammed 3 1 Dept of Chemistry, Ifet College of Engineering, Gengarampalayam,Villupuram, 605 108,Tamilnadu,India. 2 Dept of Chemistry, Thiru. Vika. Govt Arts College, Kidarankondan, Thiruvarur,610 003,Tamilnadu,India. 3 Dept of Chemistry, Khadirmohideen College, Adirampattinam, Tanjore, 614 701,Tamilnadu,India. Abstract: Batch adsorption experiments were carried to fix the adsorption dosage and also to find the optimum pH. A thermodynamic study was made on the adsorption of Cr (VI) ions in aqueous solution distinctly by the adsorbent such as activated Hibiscus sabdariffa Stem Nano Carbon. The adsorption of Chromium (VI) ions by activated Hibiscus sabdariffa StemNano Carbon increased when temperature was raised up to 60 o C. The thermodynamic study and kinetic models showed that the adsorption of Chromium (VI) ions follows pseudo second order kinetics and it was spontaneous and endothermic in nature. Keywords: Chromium ions; Activated Hibiscus sabdariffa StemNano Carbon; adsorption models; equilibrium. 1. Introduction With the world population set to break seven billion sometime next year, the management and use of natural resources is pushing to the forefront of world concern. With more people entering the worldwide market, an increase in products to meet their needs is inevitable. Individuals, businesses, and industries are seeing not only the long term monetary benefit of using resources wisely, but also the aesthetic and health benefits that come from environmental stewardship. This is seen from the changing of light bulbs at home to the tightening of national government and world standards for environmental quality [1] .With potable water essential to life, no where else are these standards more important than the area of water quality. Not only is water essential for life, it has become the primary workhorse of industries around the world as a working fluid, transport medium, heat transfer fluid, cleaning agent, etc. Unfortunately this has often led to the degradation of water quality as harmful effluents are returned to the environment with various contaminants from these processes [1] . One of the most startling groups of water contaminants are those of chromium due to their accumulation in biological systems and their toxicity even at relatively low concentrations [2] . Sources of chromium water contamination are varied and can be seen in every step of production from mining, purification and processing, to chromium finishing and electroplating, and even end use [3] . Electroplating, the process by which chromium is deposited on a surface via an electric current, has been a major contributor to water contamination by a wide variety of chromium ions. Industry currently treats electroplating wastewater via a lime-soda precipitation technique that, although effective, essentially shifts the problem to large volumes of International Journal of ChemTech Research CODEN (USA): IJCRGG ISSN: 0974-4290 Vol.8, No.12 pp 662-673, 2015