STABLE AND EFFICIENT METAL -BIOCHAR SUPPORTED CATALYST. DEGRADATION OF MODEL POLLUTANTS THROUGH SULFATE RADICAL-BASED ADVANCED OXIDATION PROCESSES

FERMIN DELGADO; VICTORIA S. GUTIÉRREZ; MARIANA DENNEHY; MARIANA ALVAREZ

Biochar

Springer

Año: 2020

2524-7972

This study focuses on the synthesis of metal-based biochar catalysts andtheir catalytic activation of peroxymonosulfate (PMS, HSO5-)for the degradation of three different wastewater model pollutants employing advancedoxidation processes (AOP). Iron, copper, and two different cobalt-based catalystswere prepared and evaluated. The catalysts were supported on a biochar obtainedfrom the pyrolysis of woody pruning wastes. They were characterized by C, H,and N elemental analysis, X-Ray Diffraction (XRD), Fourier-transform Infrared Spectroscopy(FTIR), and Scanning Electron Microscope (SEM). The metal content in eachcatalyst was determined by means of Atomic Absorption Spectroscopy (AAS). The degradation reactions of benzoic acid (BA),catechol (C), and cinnamic acid (CA) were carried out in a lab scale batchglass reactor and were followed by UV-Visible spectroscopy (UV-Vis). Acolorimetric technique was employed to verify the presence of oxidant duringthe reaction progress. The catalyst/oxidant optimal ratio was determined forthe cobalt catalysts. Themineralization degree of the pollutants after the degradations was verified bymeans of total organic carbon (TOC) content in the residual liquids. After 4hours of reaction, the maximum mineralization was reached when C was treatedwith a cobalt-based catalyst (> 80%), and its stability was evaluated throughsuccessive cycles of use.