Pd/UiO-66(Zr) as efficient catalyst material of hydrogen promoted fenton system for enhancing oxidation of sulfamethazine.

An improved advanced oxidation process called MHACF-UiO-66(Zr) was established after the hydrogen and Pd/UiO-66(Zr) was added into the classic Fenton reaction system under normal temperature and pressure. The concentration of ferrous could be maintained more than 12 μM in the initial addition condition of trace level ferrous during the whole reaction process because the regeneration of ferric could be accelerated by the reduction of hydrogen. Through the direct detection and indirect quenching experiment, it could be confirmed that the target pollutant sulfamethazine was efficiently destructed by hydroxyl radical in the MHACF-UiO-66(Zr) system. The degradation pathway of this antibiotic, which was predicated by DFT calculation and further confirmed by the detection of intermediate products, followed by the cleavage of S–N bond. More than 98% of sulfamethazine could be degraded after 180 min reaction process. This removal efficiency was 4.8 times than that of Fenton system. Those parameters, such as the flow of H 2 , initial pH, concentration of sulfamethazine and dosage of Pd/UiO-66(Zr), hydrogen peroxide and ferrous, were systematically studied. Relied on the excellent stability of Pd/UiO-66(Zr) confirmed by morphological characterization, sulfamethazine could be efficiently degraded in this novel reaction system. [Display omitted] ► The novel MHACF-UiO-66(Zr) system was used to degrade sulfamethazine under normal temperature and pressure. ► The introduction of H 2 and Pd/UiO-66(Zr) accelerated the regeneration of FeII. ► Only trace level FeII was required. ► The sulfamethazine could be degraded rapidly by the hydroxyl radical though the cleavage of S–N bond. ► Based on the excellent stability of Pd/UiO-66(Zr), SMT could be efficiently degrade after several consecutive reaction cycles. [ABSTRACT FROM AUTHOR]