Preparation method and application of zero-valent aluminum/iron-bearing clay composite for catalyzing persulfate to oxidize organics

A refractory organic matter removing method using a zero-valent aluminum/iron-bearing clay composite, comprising:

• adding the zero-valent aluminum/iron-bearing clay composite as per a ratio in a range of 0.2 g/L to 1.5 g/L and a persulfate as per a ratio in a range of 119 mg/L to 1904 mg/L into an organic pollutant solution, and the zero-valent aluminum/iron-bearing clay composite activating, at a pH value in a range of 3.00 to 9.00, the persulfate to remove a refractory organic pollutant in the solution, wherein the organic pollutant is one selected from the group consisting of 4-chlorophenol, benzoic acid, nitrobenzene, phenol and an ofloxacin in form of solution;
• wherein the zero-valent aluminum/iron-bearing clay composite is prepared as a composite catalyst by mixing a micro-scale zero-valent aluminum and a natural iron-bearing clay mineral with ball milling, a particle size of the micro-scale zero-valent aluminum is in a range of 100 meshes to 200 meshes, namely 75 μm to 150 μm, and the natural iron-bearing clay mineral is nontronite;
• wherein a preparation method of the composite catalyst comprises:
• mixing the micro-scale zero-valent aluminum with the natural iron-bearing clay mineral in a mass ratio of 1:1 and then placing in an agate ball milling jar;
• adding agate balls with a ball to material mass ratio in a range of 20:1 to 50:1 to the agate ball milling jar;
• putting the agate ball milling jar into a vacuum jacket for vacuumizing and then performing ball milling to obtain mixed powder, wherein a duration of the ball milling is controlled in a range of 0.5 hours (h) to 4 h, and a rotation rate of planetary ball mill is controlled in a range of 200 revolutions per minute (rpm) to 800 rpm;
• and
• placing the mixed powder obtained after the ball milling in a glove box, and drying the mixed powder to obtain the zero-valent aluminum/iron-bearing clay composite.