Open AccessTorrefied and unmodified capsicum annuam biochar for the removal of synthetic hazardous pesticide (carbofuran) from watershed
Publication year - 2019
Publication title -
biointerface research in applied chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.216
H-Index - 11
ISSN - 2069-5837
DOI - 10.33263/briac95.384393
Subject(s) - carbofuran , biochar , sorption , adsorption , chemistry , pyrolysis , central composite design , chromatography , environmental chemistry , pesticide , response surface methodology , chemical engineering , organic chemistry , agronomy , biology , engineering
The present study explored the applicability of torrefied and unmodified Capsicum Annuam biochar (CABC) for the removal of carbofuran from its aqueous streams. The developed biochar at low temperature pyrolysis (300°C) attained a surface area and pore volume of 32.07 m^2⁄g and 0.064〖cm〗^3/g, respectively. The biochar was characterized for its physico-chemical transformation. It was observed that aromatic and hydroxyl groups present in the CABC were responsible for the sorption of carbofuran. The efficacy of carbofuran removal was examined by varying the process variables such as carbofuran concentration, sorption time, pH and adsorbent dosage. The investigation on isothermal models suggested a monolayer adsorption of carbofuran onto homogeneous surface of CABC. While the sorption kinetics is chemical rate controlling mechanism with abundant sorption sites available on the surface and the initial concentration of carbofuran is low compared to the sorption capacities of the CABC. The mass transfer mechanism was studied. The optimization of parameters with central composite design in response surface methodology showed an optimum adsorption uptake value obtained is 134.84 mg⁄g with a desirability value 0.98 with initial concentration as the most influencing parameter.