Adsorption plate for adsorption of heavy metal cadmium in soil and its preparation method and application
The technology of heavy metal and adsorption plate is applied in the field of ecological restoration of pollution, which can solve the problems of narrow utilization range of rice straw and rice husk, environmental pollution, etc., and achieve the effects of obvious adsorption and fixation, low price and simple operation process.
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[0021] 1. Preparation of sodium alginate-rice straw and rice husk particle adsorption plates:
[0022] (1) First remove impurities from rice straw and rice husk with a mass ratio of 1:1, rinse them with deionized water, then dry them in an oven at 100-120°C to constant weight, crush them with a grinder and pass them through a 40-mesh standard Sieve to obtain pulverized granules; add phosphoric acid to the pulverized granules at a ratio of 25 mL of 1 mol / L phosphoric acid per 100 g of pulverized granules, mix well, modify and activate at 120°C for 60 minutes, dry to remove moisture, and obtain modified granules;
[0023] (2) Weigh the raw materials according to the mass ratio of sodium alginate:modified particles 2:3, add sodium alginate to deionized water at 20-40°C, stir and mix well, add modified mixed particles, mix evenly, and prepare Homogenate with 20% solid content.
[0024] 3) Slowly add the homogenate into a cylindrical mold, the cylindrical mold is a square cylindri...
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