Conversion of spent coffee grounds to biochar as promising TiO2 support for effective degradation of diclofenac in water

• DOI: 10.1002/aoc.6001
• Publication Date: 2020-09-21T18:39:20Z
• Authors: Joseane Sarmento ...; Vitória de Lima B...; Siara Silvestri; Edson Luiz Foletto
• Keywords: Degradation

A novel composite, biochar derived from spent coffee grounds with immobilized TiO 2 (biochar–TiO ) was prepared, characterized, and applied as an alternative, effective, sustainable photocatalyst for degrading diclofenac aqueous solution. Composites different mass ratios between were prepared by mechanical mixing subsequent pyrolysis in inert atmosphere of N at 650°C. The sample biochar–TiO ratio 1:1 presented a degradation efficiency 90% just 120 min versus 40% used reference. This fact is associated set intrinsic characteristics obtained during the formation such superior pore size, avoiding recombination ē / h + pair, bandgap reduction, promotion reactive oxygen species due to phenolic groups present on surface. dominant involved photocatalytic • OH. pathways determined based identification intermediates nonpurgeable organic carbon (NPOC) analysis. composite this work showed high physical–chemical stability over five consecutive cycles reuse, proving be highly promising water.