摘要
从吸附剂的组成、结构、表面性质、溶液的酸度及砷的存在形式等方面探讨了复合铁铝氢氧化物(Fe5A l2(OH)21.nH2O)对溶液中As(Ⅴ)的吸附.结果表明,该吸附剂具有微晶体的结构特征,孔径小,比表面积大,等电位点pH值为8.3;在pH为4—8的溶液中,对As(Ⅴ)的吸附能力很强,饱和吸附容量Qm分别为:0.7901(pH5),0.5981(pH7)和0.3033(pH9)mol.kg-1,常见共存离子不影响砷的吸附.Langm iur方程能很好地描述实验的吸附等温线.吸附态As(Ⅴ)的解吸量随解吸剂pH值的升高而增大.
In this study, the mechanism of aqueous As（V） adsorption on synthetical iron-aluminum hydroxide complex was investigated in view of the component, structure, and surface character of the adsorbent and the pH, component, and arsenate species of the solution. Experimental results indicated that this complex had microcrystal＇s mineral characteristics, small pore radius and large surface area, and its ZPCpH was 8.3. In pH 4-8 solution, the absorbent showed that it had a high adsorption capacities for As （ V ） with saturated adsorption capacities （ Qm ） of 0. 7901 （ pH5 ）, 0. 5981 （ pH7 ） and 0. 3033 （ pH9 ） mol ·kg^-1, and the common co-existed ions didnt influence its adsorption ability for As（V）. The adsorption isotherms of arsenic agreed well with the Langmuir equations. The desorption rate of As（ V ）increased with increase of the pH of NaHCO3from pH 6 to pH 7.
出处
《环境化学》
CAS
CSCD
北大核心
2006年第6期743-747,共5页
Environmental Chemistry
基金
教育部留学回国人员科研启动基金(教外司留2003-14)
广西省高校百名中青年学科带头人资助计划(桂教人2003-97)项目.
关键词
复合铁铝氢氧化物
AS(V)
吸附
机理
iron-aluminum hydroxide complex, As（V）, adsorption, mechanism.
