Composite material and method for removing pollutant from polluted water

A composite material which is used for soil remediation or sewage purification, and is suitable for chemical removal and degradation of complex contaminants from an acidic to alkaline environment, wherein

• the composite material consists of aluminum alloys with at least one of alkaline-earth metals and transition metals, which are used for removal of chemical pollutants by being dissolved to release divalent metal ions, trivalent aluminum ions and hydroxide ions, which contact with other divalent and trivalent metal cations and anions in the contaminated water, so as to perform an in situ self-assemble of two-dimensional Layered Double Hydroxides (LDH) precipitates;
• the composite material is with a core-shell structure of Alloy@LDH, and is composed of aluminum core metal, a second type of zerovalent metal, and an auxiliary agent;
• the auxiliary agent is selected from silicon, silicon dioxide or stearic acid;
• the aluminum metal comprises 18-70 weight % of the composite material, the second type of zerovalent metal comprises 30-80% weight of the composite material, and the auxiliary agent comprises 0-2 weight % of the composite material;
• a source of the aluminum metal is metallic aluminum, aluminum calcium alloy, aluminum magnesium alloy, aluminum iron alloy, aluminum zinc alloy, aluminum nickel alloy, aluminum manganese alloy, or aluminum silicon alloy;
• a source of the second type of zerovalent metal is at least one of elemental calcium, elemental magnesium, elemental iron, elemental zinc, elemental nickel and elemental manganese, or an alloy composed of two or more elements of calcium, magnesium, iron, zinc, nickel, and manganese;
• and
• the composite material is with a particle size of 0.01-3 mm to remove contaminants at initial pH<10.