摘要
以丙烯腈改性的玉米秸秆为吸附剂,对水体中的Cu2+,Pb2+,Cd2+进行吸附,用双组分竞争模型和LCA模型对实验结果进行拟合.结果表明:改性玉米秸秆对三种重金属离子的吸附能很好地符合Lang-muir方程,相关性(R2)分别为0.98,0.95和0.98,最大吸附容量分别为9.34,31.8和12.7mg.g-1;在Cu2+和Pb2+存在下,改性玉米秸秆对Cd2+的吸附受到明显的抑制,且随Cu2+和Pb2+浓度的增大抑制作用加强;在低浓度时,该吸附材料优先吸附顺序为:Cu2+>Pb2+>Cd2+,高浓度时为:Pb2+>Cu2+>Cd2+.
In this experiment, corn stalk modified by acrylonitrile was used to adsorb Cu^2＋, Pb^2＋ and Cd^2＋ inaqueous solution. Two different models, Langmuir competitive adsorption （LCA） and two-component competitive models were employed to describe the adsorption process. The results showed that adsorption of heavy metals by modified corn stalk was fit the Langmuir＇s equation completely, and R^2 were larger than 0. 95,and the absorption maximum were 9.34, 31.8mg · g^-1 and 12. 73mg · g^-1 respectively for above three metals. The adsorption capacity of Cd^2＋ was markedly restrained with the concentration of Cu^2＋ and Pb^2＋ in solution. According to the equilibrium competitive coefficients, the adsorption sequence of modified corn stalk was Cu^2＋ , Pb^2＋and Cd^2＋.
出处
《环境化学》
CAS
CSCD
北大核心
2009年第3期379-382,共4页
Environmental Chemistry
基金
国家自然科学基金重点项目(40730741)
863项目(2007AA061001)
制浆与造纸国家重点实验室开放基金共同资助
关键词
重金属离子
等温吸附
丙烯腈改性玉米秸秆
竞争吸附
heavy metals, adsorption isotherm, corn stalks modified acrylonitrile, competitive adsorption
