摘要：

采用十六烷基三甲基溴化铵改性制得有机改性水滑石,并用XRD和红外光谱进行表征.考察了有机改性水滑石对染料废水的吸附能力及相关影响因素.结果表明,水滑石改性后对染料吸附能力提高,染料去除率随改性水滑石投加量的增加而提高,随染料初始浓度的增大而降低,温度太高不利于染料的吸附,pH对染料废水的处理效果影响不大.改性水滑石对染料的吸附可用Langmuir等温吸附方程拟合,二级吸附模型能很好地描述改性水滑石对染料的吸附行为.表征结果表明十六烷基三甲基溴化铵进入到水滑石层间,但水滑石结构并没有发生大的变化.

关键词: 水滑石, 有机改性, 染料废水, 吸附

Abstract:

Organic modified layered double hydroxides(LDHs)has been prepared by the modification of cetyltrime- thyl ammonium bromide(CTAB),and characterized by XRD and FT-IR,respectively. The adsorption capacity of organic modified layered double hydroxide for dye wastewater and the corresponding influencing factors are systematically investigated. The results show that the modified LDHs can improve its adsorption capacity for dye. The dye removing rate increases with the increase of LDHs dosage and decreases with the increase of initial concentration of dye. High temperature is not good for dye adsorption,but pH does not have much influence on the treatment efficiency of dye wastewater. The adsorption of modified LDHs can be fitted by Langmuir isotherm adsorption equation,and the secondary adsorption model can well describe the adsorption behavior of modified LDHs. The characterization results show that cetyltrimethyl ammonium bromide has entered into the layers of LDHs, but there has not been much change in the structure of LDHs.

Key words: layered double hydroxides, organic modification, dye wastewater, adsorption

中图分类号: 

• X703.1