Development of economical adsorbent from bio-waste precursor: waste as a resource for waste water treatment
Abstract
Low cost solution to environmental pollution are highly in demand. In this context, current study focusses on the use of biowaste in raw form as well as its activation to increase its adsorption potential. Rice straw is a biowaste which is also a problem as it is burnt to get the fields prepared for next crop. This study aims to use this waste as resource by using its potential as adsorbent for the removal of cationic dye crystal violet. Raw as well activated rice straw was characterized using FTIR, BET and pHzpc analysis. It was observed that a greater number of functional groups were present on raw rice straw as compared to activated one where as surface area and pore volume increased after activation. Adsorption study was done using batch mode technique by varying different parameters like time, pH, adsorption dose and initial concentration of the dye. Lagergren second order and Langmuir isotherm best described the adsorption behavior of both the adsorbent. Activated rice straw has more adsorption potential as compared to raw rice straw.