Phosphate modified attapulgite magnetic passivator and use method thereof
A technology of attapulgite and phosphate, applied in chemical instruments and methods, land preparation methods, applications, etc., can solve the problems of cumbersome process and secondary pollution, and achieve the improvement of specific surface area, passivation effect, and surface adsorption point. Effect
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Embodiment 1
[0028] 1) Preparation of phosphate-modified attapulgite: Weigh 3g parts by weight of trisodium phosphate into a container, add an appropriate amount of deionized water, stir for 25 minutes, add 7g parts by weight of attapulgite, and add deionized water to make the water-to-soil weight ratio 18 : 0.5, ultrasonic vibration for 8h, standing for 25min, suction filtration, the obtained filter residue was repeatedly rinsed with deionized water, dried, and ground through a 120 mesh sieve to obtain phosphate modified attapulgite powder;
[0029] 2) Material magnetization:
[0030] a. Add deionized water in the container, then add 0.7g parts by weight of phosphate modified attapulgite, 5g parts by weight of FeCl 3 ▪6H 2 O and 2g parts by weight FeSO 4 ▪7H 2 O, phosphate-modified attapulgite: the weight-to-volume ratio of deionized water is 170ml: 0.7g, heated in a nitrogen environment at 65°C;
[0031] b. Add 7mol / L NaOH solution dropwise, the volume ratio of NaOH solution: deioniz...
Embodiment 2
[0034] 1) Weigh 3.929g of trisodium phosphate into a beaker, add an appropriate amount of deionized water, stir for 30 minutes, add 10g of attapulgite, add deionized water to keep the water-soil ratio at 20:1, ultrasonically shake for 10h, stand for 30min, and filter with suction , the obtained filter residue is repeatedly washed with deionized water, dried, and ground through a 100-mesh sieve to obtain a phosphate-modified attapulgite powder;
[0035] 2) Material magnetization:
[0036] a. Add 200ml deionized water to a 500ml beaker, then add 1.0g phosphate modified attapulgite and 5.96g FeCl 3 ▪6H 2 O, 3.06 g FeSO 4 ▪7H 2 O, heated in a nitrogen atmosphere at 70°C;
[0037] b. Add 10ml of 8.0mol / L NaOH solution dropwise to precipitate iron oxide in the solution, adjust the pH to 11.0, stir for 1h, age the mixture at 70°C for 4h, wash with double deionized water until the supernatant is medium The obtained material is baked at 100°C for 3 hours, and ground through a 100-...
Embodiment 3
[0040] 1) Preparation of phosphate-modified attapulgite: Weigh 5g of trisodium phosphate into a container, add an appropriate amount of deionized water, stir for 35 minutes, add 13g of attapulgite, add deionized water to make the water-soil weight ratio 22:1.5, and ultrasonically Shaking for 12 hours, standing still for 35 minutes, and suction filtering, the resulting filter residue was repeatedly washed with deionized water, dried, and ground through an 80-mesh sieve to obtain phosphate-modified attapulgite powder;
[0041] 2) Material magnetization:
[0042] a. Add deionized water to the container, then add 1.3g phosphate modified attapulgite, 7g FeCl 3 ▪6H 2 O and 4gFeSO 4 ▪7H 2 O, phosphate-modified attapulgite: the weight-to-volume ratio of deionized water is 230ml: 1.3g, heated in a nitrogen environment at 75°C;
[0043] b. Add 9mol / L NaOH solution dropwise, the volume ratio of NaOH solution: deionized water is 1.2ml: 23ml, precipitate the iron oxide in the solution,...
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