Method for repairing cadmium contaminated soil through compound soil repair agent
A soil remediation agent and a technology for cadmium-contaminated soil, which is applied in the field of remediation of cadmium-contaminated soil by a composite soil remediation agent, can solve the problems of unstable remediation effect of single activated carbon, poor remediation effect, strong ability and the like, and achieves low synthesis and transportation costs, Low-cost, wide-ranging effects
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[0040] A method for synergistically repairing cadmium-contaminated soil using hydroxyapatite-calcium silicate hydrate and biochar, comprising the following steps:
[0041] (1) Preparation of composite soil remediation agent
[0042] (a) Preparation of hydroxyapatite-calcium silicate composite material:
[0043] Dissolve 6g of calcium chloride in 60ml of water to obtain a calcium chloride solution;
[0044] 5g of sodium silicate was dissolved in 50ml of water to obtain sodium silicate solution;
[0045] The resulting calcium chloride solution was slowly added dropwise to the sodium silicate solution under ultrasonic conditions, resulting in a white sol that gradually hardened and was sampled, taken out and incubated in a plastic container at room temperature for 24 hours. In order to remove free calcium hydroxide, wash and filter with deionized water after the reaction, and finally dry at 80°C for 24 hours to obtain calcium silicate hydrate. The scanning electron microscope pic...
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