Removal of phenol from aqueous solution using biochar produced from Araucaria Columnaris Bark

Abstract

This work investigates the removal of phenol from aqueous solution using Araucaria Columnaris bark (ACB) as biochar. Five different types of biochars were developed through pyrolysis at different temp from 300 to 500°C. The effects of initial concentration, contact time, pH and temperature on adsorption behavior were studied in batch mode for each biochar. The optimum contact time observed for equilibrium condition was 60 mins for every biochar. And, the maximum adsorption followed the order 298 K > 308 K > 318 K. Adsorption equilibrium data were fitted to Langmuir and Freundlich isotherms by non-linear regression method and kinetic data by linear regression method, and fitted to pseudo-first order, pseudo-second order and Intraparticle diffusion models. Adsorption kinetics was reasonably described by pseudo-second order model with R 2 value 0.99. Thermodynamic parameters were also estimated that implied, the adsorption process was spontaneous and exothermic in nature. Study further showed that the acidic pH increased adsorption capacity of biochar but decreases continuously towards basic side. The removal of phenol with prepared biochar was achieved as high as 100 % for ACB-500. The maximum iodine adsorption value of prepared biochar was found to be 453.3 mg/g.

Systematic studies on the effect of structural modification of orange peel for remediation of phenol contaminated water

“…The important parameters such as heat treatment time and temperature should be optimized for the synthesis of highly efficient biochar. Adsorption capacity is directly related to the porosity of biochar (Chandola et al, 2021; Wang & Wang, 2019). Several studies have been reported on the analysis of the adsorption efficiency of plant waste biochar on phenol adsorption (Acharya et al, 2018; Afsharnia et al, 2016; Chandola et al, 2021).…”

“…Adsorption capacity is directly related to the porosity of biochar (Chandola et al, 2021; Wang & Wang, 2019). Several studies have been reported on the analysis of the adsorption efficiency of plant waste biochar on phenol adsorption (Acharya et al, 2018; Afsharnia et al, 2016; Chandola et al, 2021). For the plant waste adsorbent, orange peel biochars show a high adsorption capacity for the removal of heavy metals (Tran et al, 2016), dye (Amin et al, 2019; Kapoor & Sivamani, 2023), and organic impurities like phenols (Ikpe et al, 2017; Rana et al, 2017).…”