负载型 Co₃O₄ 活化过二硫酸盐非自由基降解有机污染物

Nanosized Co₃O₄ particles were in situ grown on the surface of three-dimensional mineral substrates by calcining surface-coated metal-phenolic coordination polymer. Immobilizing Co₃O₄ nanoparticles on the mineral substrate allows facile separation and recovery. SEM, XRD and XPS were performed to characterize the morphology and microstructure of the immobilized Co₃O₄ nanoparticles. The immobilized Co₃O₄ was applied to active peroxydisulfate (PDS) to degrade pharmaceutical and personal care products in water. The influence of initial pH, PDS concentration, catalyst dosage, inorganic ions (CO₃²⁻, SO₄²⁻, NO₃⁻, Cl⁻) and humic acid (HA) on organics degradation was systematically investigated by using bis-phenol A(BPA) as a probe contaminant. The results showed that the immobilized Co₃O₄ could effectively active PDS to degrade BPA. Under the optimized conditions with a catalyst dosage of 0.075 g·L⁻¹, PDS concentration of 0.4 mM, BPA with initial concentration of 0.04 mM and pH7 was completely removed within 120 min. Chemical scavenging experiments and EPR tests revealed the degradation of BPA followed a nonradical oxidation pathway based on singe oxygen (¹O₂).