Amorphous iron-manganese colloid material as well as preparation method and application thereof
A colloidal material and amorphous technology, which is applied in the field of arsenic and antimony contaminated soil treatment, can solve the problems of rarely used soil remediation, and achieve the effect of easy large-scale production, excellent effect, and wide range of pH application
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Embodiment 1
[0052] After washing with water to remove impurities such as sediment and sand attached to the surface, drying at 60°C, grinding, and sieving 5g of 40-mesh spent grains into the ball mill tank, adding grinding balls at a ratio of 15:1, the ball mill is an omnidirectional Planetary ball mill, set the ball milling speed to 320 rpm, after ball milling for 8 hours, sieve through 100 meshes, then disperse into 1L of 100 ℃ boiling deionized water and stir for 30 minutes, then filter and cool to room temperature to obtain the spent grains extract ( 0.5 wt%). After that, 2.8 g of ferrous sulfate heptahydrate and 0.2 g of potassium permanganate were respectively dissolved in 100 mL of the spent grains leaching solution. Secondly, under magnetic stirring at 200 rpm, the ferrous sulfate solution of wheat spent grains was slowly added to the potassium permanganate wheat spent solution, and at the same time, the pH was adjusted to 7.5 with 0.5 mol / L sodium hydroxide. The system continued ...
Embodiment 2
[0054] Since iron and manganese oxides are easy to agglomerate, this example compares the suspended state of iron and manganese oxides modified by different dispersants. The specific method is as follows: the synthetic method of modified iron manganese oxide without adding dispersant is as follows: dissolve 2.8g ferrous sulfate heptahydrate and 0.2g potassium permanganate into 100ml deionized water respectively, stir magnetically at 200rpm until completely dissolved, Under magnetic stirring, the ferrous sulfate solution was slowly added to the potassium permanganate solution, and the pH was adjusted to 7.5 with 0.5mol / L sodium hydroxide. . The rest of the carboxymethyl cellulose (CMC); rhamnolipid; xanthan gum; starch and wheat grains leaching solution (treated with Example 1) modified iron manganese oxide synthesis method: 2.8g ferrous sulfate seven Hydrate and 0.2g potassium permanganate were dissolved in 100ml of 0.5wt% carboxymethyl cellulose (CMC); rhamnolipid; xanthan g...
Embodiment 3
[0056] 2.516; 2.621; 2.8; 2.862 g of ferrous sulfate heptahydrate and 0.484; 0.378; 0.2; 0.138 g of potassium permanganate were dissolved in 100 mL of 0.5 wt % spent grains leaching solution respectively. Secondly, under magnetic stirring at 200 rpm, the ferrous sulfate solution of wheat spent grains was slowly added to the potassium permanganate wheat spent solution, and at the same time, the pH was adjusted to 7.5 with 0.5 mol / L sodium hydroxide. The system continued to stir for 2 hours to obtain amorphous iron-manganese colloidal materials with iron and manganese molar ratios of 3:1; 4:1; 8:1; 12:1, respectively, and the iron ion concentrations were 0.045; 0.047; 0.05; 0.051mol / L, respectively .
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