Combination of adsorption/desorption and photocatalytic reduction processes for PFOA removal from water by using an aminated biosorbent and a UV/sulfite system

• DOI: 10.1016/j.envres.2023.115930
• Publication Date: 2023-04-17T15:01:56Z
• Authors: Zhongfei Ren; Ulrich Bergmann; Jean Noel Uwayezu; Ivan Carabante; Jurate Kumpiene; Tore Lejon; Tiina Leiviskä
• Keywords: Perfluorooctanoic acid

Per- and polyfluoroalkyl substances (PFAS) are stable organic chemicals, which have been used globally since the 1940s caused PFAS contamination around world. This study explores perfluorooctanoic acid (PFOA) enrichment destruction by a combined method of sorption/desorption photocatalytic reduction. A novel biosorbent (PG-PB) was developed from raw pine bark grafting amine groups quaternary ammonium onto surface particles. The results PFOA adsorption at low concentration suggest that PG-PB has excellent removal efficiency (94.8%-99.1%, dosage: 0.4 g/L) to in range 10 μg/L 2 mg/L. exhibited high regarding PFOA, being 456.0 mg/g pH 3.3 258.0 7 with an initial 200 groundwater treatment reduced total 28 18 000 ng/L 9900 0.8 g/L PG-PB. Desorption experiments examined types desorption solutions, showed 0.05% NaOH mixture + 20% methanol were efficient for spent More than 70% (>70 mg/L 50 mL) 85% (>85 recovered first second processes, respectively. Since promotes degradation, eluents directly treated UV/sulfite system without further adjustment. final degradation defluorination reached 100% 83.1% after 24 h reaction. proved combination adsorption/desorption is feasible solution environmental remediation.