In this study

the perovskite nanocomposite PrFe

x

Co

1-

x

O

3

(Pr(S)) was successfully synthesized by the sol -gel method; PrFe

x

Co

1-

x

O

3

/Al-pillared montmorillonite (Pr(S)/Mt) catalysts were prepared by impregnation (D) method and solid-melting (G) method

respectively

with Pr(S) as the active component and Al-pillared montmorillonite as the carrier. The catalysts were applied to treat the 2-hydroxybenzoic acid (2-HA)-simulated wastewater by catalytic wet peroxide oxidation (CWPO) technique

and the chemical oxygen demand (COD) removal rate and the 2-HA degradation rate were used as indicators to evaluate the catalytic performance. The results of the experiment indicated that the solid-melting method was more conducive to preparing the catalyst when the Co/Fe molar ratio of 7:3 and the optimal structural properties of the catalysts were achieved. The influence of operating parameters

including reaction temperature

catalyst dosage

H

2

O

2

dosage

pH

and initial 2-HA concentration

were optimized for the degradation of 2-HA by CW

PO. The results showed that 97.64% of 2-HA degradation and 75.23% of COD removal rate were achieved under more suitable experimental conditions. In addition

after the catalyst was used five times

the degradation rate of 2-HA could still reach 76.93%

which implied the high stability and reusability of the catalyst. The high catalytic activity of the catalyst was due to the doping of Co into PrFeO

3

which could promote the generation of HO·

and the high stability could be attributed to the loading of Pr(S) onto Al-Mt

which reduced the leaching of reactive metals. The study of reaction mechanism and kinetics showed that the whole degradation process conformed to the pseudo-firs-torder kinetic equation

and the Langmuir-Hinshelwood method was applied to demonstrate that catalysis was dominant in the degradation process.