Co-MOF-74 based Co 3 O 4 /cellulose derivative membrane as dual-functional catalyst for colorimetric detection and degradation of phenol.

Smart nanomaterials that can simultaneously detect and eliminate contaminants in water environment are significant for health protection. To achieve such goal, Co-MOF-74 was in-situ assembled on regenerated cellulose membranes followed by calcination process, thus achieving dual-functional Co ₃ O ₄ /cellulose derivative membrane (Co ₃ O ₄ /CDM) catalyst. The Co ₃ O ₄ morphology was readily controlled by further recrystallization of the deposited MOF precursor. Combining the high enrichment ability of cellulose membrane and outstanding peroxidase-active of Co ₃ O ₄ , the fast color reaction for phenol was accomplished within 10 min by Co ₃ O ₄ /CDM with the assistance of H ₂ O ₂ and 4-aminoantipyrine (4-AAP). Moreover, the Co ₃ O ₄ /CDM also portrayed an excellent degradation property for phenol elimination via sulfate radical-advanced oxidation processes (SR-AOPs). The degradation efficiency of phenol reached 93% in 20 min, and the possible mineralization mechanism was proposed based on the XPS and LC-MS analysis. Thus, Co-MOF-74 derived Co ₃ O ₄ /CDM shows excellent properties in aiding the colorimetric detection and degradation of phenol in aqueous solutions.
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