ASSESSMENT OF SORPTION POTENTIAL OF PADDY STRAW BIOCHAR FOR LEAD (PB2+) REMOVAL FROM WASTEWATERDIPAKSHI SHARMA, SARASWATI SAINI, DINESH KUMAR,INDERPREET KAUR AND SATWINDERJEET KAURAbstract The rapid industrialization and insufficient waste disposal techniques are paving the way for heavy metals to enter into the environment. Lead is one of the major heavy metal pollutant and potential neurotoxin to human. The paddy straw waste is easily available material. It may act as a cost-effective and eco-friendly sink for heavy metal pollution. Therefore, the present study explores the adsorption potential of paddy biochar (BR-300) prepared at 750°C for the removal of lead metal ions from wastewater. The BR-300 showed adsorption capacity (qmax = 111.111 mg/g) at very low adsorbent dose of 20 mg and at the optimum pH 5 and temperature 25°C. The rate of adsorption was quite rapid and equilibrium was attained in 30 min contact time. It obeyed the pseudo-second order kinetics along with Langmuir isotherm followed by Freundlich and Temkin isotherms. The Langmuir separation factor indicated towards the favorable adsorption with constant correlation coefficient (0.997) at all temperature levels. The Freundlich and Temkin isotherms for current study displayed the coordinated adsorption as well as the endothermic nature of the reaction. The paddy biochar was capable to completely remove Pb2+ metal ions from the spiked (50 ppm) wastewater samples. It was also observed that BR-300 changed the pH of solution after adsorption from acidic to near neutral pH. The results indicate that BR-300 is quite efficient in the removal of Lead from wastewater samples. Paddy Biochar thus can be exploited for the removal of heavy metals from the environment.
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