2-Methyl-4-chlorophenoxyacetic acid (MCPA) is a herbicide that poses a threat to the environment. In this study, MIL-88A was utilized as a photocatalyst to degrade MCPA. Results demonstrated that the Light/MIL-88A/H 2 O 2 system exhibited remarkable photo-Fenton catalytic activity . Under optimal conditions of pH = 3.8, H 2 O 2 concentration of 1.2 mL/L, MIL-88A dosage of 0.2 g/L and an initial MCPA solution concentration of 50 mg/L, the degradation efficiency reached its peak, achieving a 99.9 % degradation rate of MCPA within 60 min. The morphology, structure, and photocatalytic performance of MIL-88A were investigated using characterization techniques such as SEM, XRD , XPS , and UV–vis DRS . Free radical quenching experiments and ESR characterization demonstrated that the main active material in the degradation of MCPA was •OH. The possible degradation pathways of MCPA were hypothesized by combining the results of Gaussian software and LC-MS analysis. Furthermore, the toxicity of MCPA was evaluated using T.E.S.T. software and mung bean germination experiments. The results revealed that the degradation of MCPA by Light/MIL-88A/H 2 O 2 system could achieve solution detoxification .
Novel zero-valent iron (ZVI) and zero-valent zinc (ZVZ) bimetal-supported biochar (ZF@BC) was developed for heterogeneous catalytic ozonation (HCO), which demonstrated the unique dual synergistic adsorption and catalysis-induced effective O 3 triggering and interfacial decontamination. ZF@BC exhibited impressive catalytic and structure stabilities for 2-methyl-4-chlorophenoxyacetic acid (MCPA) degradation during long-lasting HCO, which can resist interference from a complex water quality background. Abundant electron-rich oxygen-containing functional groups and defects on BC contributed to the adsorption of MCPA and O 3 , respectively, while the introduced ZVZ was anticipated to expedite O 3 decomposition by facilitating single-electron transfer reduction of O 2 and establishing a robust connection with ZVI. Continuous efficacy of bimetal in three stages enhanced the efficiency of O 3 utilization and hydroxyl radicals ( • OH) yield, thereby safely mitigating the associated toxicity of MCPA after treatment. The development of O 3 /ZF@BC introduced a sustainable, long-term decontamination strategy and provided valuable insights for the advancement of HCO.
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