核桃青皮及其多酚提取物与不同金属离子的吸附性研究

Adsorptive Property of Walnut Green Husk and Polyphenols Extracted for Different Metal Ions

研究了核桃青皮及其多酚提取物与不同金属离子在不同条件下的吸附规律,结果表明,最佳浓度、反应pH值、反应时间和最大吸附率,Pb^(2+)分别为80mg·L^(-1)、3、2 h和98.2%,Cd^(2+)为10 mg·L-1、5、2 h和95.3%,Cu^(2+)分别为100 mg·L-1、6、2 h和93.8%;对Cu^(2+)的吸附速率最快,吸附稳定性也最好;对Pb^(2+)和Cd^(2+)吸附速率类似,都在2 h左右达到吸附平衡,但是对Pb^(2+)的吸附稳定性最差,在反应3 h后发生明显的解吸附;Cd^(2+)和Cu^(2+)的吸附率随p H值得升高而升高,Pb^(2+)的吸附率随p H的升高先升高后降低.

The adsorption of walnut peel and polyphenol extracted to different metal ions under different conditions, the results showed that： the best concentration, reaction pH value, reaction time and the maximum adsorption rate were 80 mg/L,3,2 hours and 98.2%, and for Cd^2＋ and Cu^2＋ were rag/L,5,2 hours ,95.3% and 100mg/L,6,2 hours, 93.8% respectively; The adsorption rate of Cu^2＋ was the fastest and the adsorption stability was also best;The adsorption equilibrium of Cd^2＋ and Pb^2＋ were reached at 2 hours both, but the adsorption stability of Pb^2＋ was the worst,because the adsorption of the solution was obvious after 3 hours;The adsorption rate of Cd^2＋ and Pb^2＋ in- creased with the increasing of pH, and the adsorption rate of Cu^2＋ increased with the increasing of pH, and then decreased.