Covalent organic framework material as efficient adsorbent and H2-Accelerated catalytic Fenton catalyst for enhanced removal of sulfamethazine

A novel CHACF-JUC-505 system through the introduction of H 2 and Pd/JUC-505 into the classic Fenton system under normal temperature and pressure was developed in this work. Through the experiment of quenching hydroxyl radical (·OH) by methanol, the analysis of degradation intermediates and total organic carbon, it was confirmed from the reverse that the target pollutant sulfamethazine (SMT) could be quickly adsorbed by JUC-505. The activated hydrogen generated from the adsorbed and activated H 2 by Pd/JUC-505 accelerated the reduction of Fe III . It was confirmed that the continuous production of ·OH required only a trace amount of iron by the detection of para-hydroxybenzoic acid. The removal of SMT was further enhanced by the degradation of ·OH. The cleavage of S N bond was considered to be the major degradation pathway of SMT. The concentration of Fe II in the CHACF-JUC-505 system could be at least 14.72 μM. And the removal efficiency of SMT was about 96.77 %. That was 3 and 4.6 times that of the Fenton system in the same reaction condition, respectively. The effects of the dosage of ferrous ion, H 2 O 2 and Pd/JUC-505, initial concentration of SMT and pH, and the flow of H 2 were investigated. The robustness and morphological changes in Pd/JUC-505 were also systematically analyzed.