Abstract
Magnesium hydroxide has good adsorption performance for Cu2+ in wastewater as an adsorbent, while magnesium hydroxide particles carry a lot of electric charges, which makes it difficult for the particles to settle. To solve this problem, the composite of cross-linked starch and magnesium hydroxide IStMg was synthesized. IStMg was prepared by using cross-linked starch and MgSO4·7H2O as raw materials and NaOH as an alkalizing agent, and the adsorption performance of this composite for Cu2+ was tested. In the adsorption experimentials, when ρ 0cu2+=20 mg/L and the dosage of IStMg was 300 mg/L, the removal rate of Cu2+ was 91.7%. The absorption mechanism contains the complexation of the hydroxyl group in magnesium hydroxide to Cu2+ and the ion exchange between Mg2+ and Cu2+.
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