关键词: 改性生物炭, 镉, 吸附特性

Abstract: In order to study the adsorption removal effect of Cd by biochar in solution, and further enhance the Cd adsorption property of biochar, this experiment took corn cob, cornstalk, sawdust as raw material, and manufactured biochar under sealed hypoxia pyrolysis conditions of 400℃, 500℃, 600℃ and 700℃, respectively. The biochar was modified by microwave and NaOH methods. Studies were conducted on adsorption effects of Cd by biochar from the factors of initial concentration, solution pH and adsorption time. Suitable biochar varieties for treating cadmium pollution of water bodies were selected. The results showed that when the Cd concentration was 100 mg/L, the adsorption of Cd by B-6-Na treatment could match by Langmuir equation. Its adsorption capacity was 78.7 mg/L and the removal rate was 78.7%, basically reaching adsorption equilibrium time was about 60 min~120 min. When the solution pH value was 7, the adsorption rate of Cd by these 3 biochars were over than 80%. Cornstalk biochar under 600℃ condition modified and prepared by NaOH solution had a better absorption of Cd in solution. The result has provided reference for preparing highly efficient, with deep purification function biochar on pollutants, and also theoretical support for in-depth studies on the feasibility of remediation using biochar for Cd pollution.