杉木木屑对废水中Hg^(2+)的静态吸附研究

Static Adsorption of Hg^(2+) from Water by Chinese Fir Sawdust

研究了未改性、HNO3改性和NaOH改性杉木木屑对水中Hg2+的吸附特性,并探讨Hg2+初始浓度、pH值、吸附时间和木屑用量对吸附率的影响。结果表明,杉木木屑对水中Hg2+具有较好的吸附效果,吸附率可达90%以上。杉木木屑对Hg2+的吸附动力学可用拟二级动力学方程描述。研究表明,利用酸碱改性杉木木屑制备废水中Hg2+吸附材料具有广阔的应用前景。

The adsorption behavior of non-modified, HNO3,modified and NaOH-modified Chinese Fir sawdust to Hg^2＋ in water was investigated. The effects of initial metal concentration, pH, adsorption time, quantity of sawdust on the adsorption rate and the adsorption kinetic were discussed. The resuhs showed that： three sawdusts had a good effect on adsorption of Hg^2＋, and the adsorption rate could reach over 90%. The adsorption kinetic of Hg^2＋ could be described by the pseudo- second-order kinetic model. The HNO3-modified and NaOH-modified sawdust had good application foreground in preparation of Hg^2＋ adsorption material.