REMOVAL OF TIN FROM SYNTHETIC WASTE WATER

Abstract

Most heavy metals can affect microorganism at the concentrations which is normally found in the environment. However, toxicity of metal depends on the physiochemical characteristics of environment such as pH, temperature, pressure and ionic strength. Most studies on the toxic effects of tin have concentrated on organotin compounds. Toxicity studies of inorganic tin compounds are virtually noncoexistent, the earlier works have been proved that inorganic tin species would hydrolyze to form insoluble matter. However, recent works show that as little as 10 mg/1 of tin as (SnC12.5H20) significantly reduce microbial population. Exposure to inorganic tin occurs in the mining and smelting of tin are in the plating, alloys, toothpaste, ceramics and textile production. Acute gastrointestinal illness follows the intake of food containing high level of tin absorption from the guts less than five percent. Tin deposits in bones, liver, kidney and lymph nodes. Effects of tin on human beings are growth retardation, anemia, and change in enzyme activities. Absorption and excretion of copper, calcium, iron, and zinc leads to morphological change in liver and kidney. In order to recover valuable metal from printed circuit board and tin plating by solvent such as extraction, electrowinning, stripping, and precipitation method have been done at different cost. The present work is adsorption of Tin(II) ion on granulated activated carbon from synthetic waste water. Proximate, ultimate analysis, particle size and thenno gravimetric analysis of GAC is carried out for detail characterization. Various batch parameters like optimum pH, contact time, adsorbent dose, temperature etc. studied. The effective pH found to be 4.0 and kinetic studies show that the adsorption equilibrium reached in 330 minutes. Optimum dose found to be 8 g/1 of GAC in solution. Process of tin uptake followed pseudo-second order kinetics and equilibrium isotherm follows Langmuir and Redlich Peterson isotherms. Thermodynamic studies show that tin adsorption on GAC is endothermic in nature. Thermodynamic energy parameters such as AG°, Ale and A S° for adsorption estimated based on equilibrium data.