中文摘要：

研究镁．铝盐水解共沉淀法即时合成层状双氢氧化物（LDH）去除偶氮类染料亮蓝的效果及其影响因素。其净化机理是，混合溶液在NaOH快速滴加的同时，溶液中Mg^2＋、Al^3＋水解共沉淀形成LDH，染料阴离子以平衡LDH结构电荷的形式进入LDH结构层间，含有亮蓝的LDH通过沉淀分离从溶液中去除。在亮蓝溶液的浓度为800mg·L^-1时，镁一铝盐水解共沉淀法即时合成LDH对其去除率可高达99％。正交试验及极差分析结果表明，即时合成LDH处理亮蓝废水的最佳试验条件为：pH8．5，温度80℃，时间对其影响的显著性不大，此条件下去除率达到99．81％。

英文摘要：

We preliminary discussed efficiency and effect factors of removal azo pigment brilliant blue FCF by synthesizing layered double hydroxide （LDH） in situ with Mg^2 ＋ and Al^3＋ co-precipitates. Principle of the method can be described as follows： Mg^2＋ and Al^3＋ hydrolyze and form LDH by adding Mg^2＋, Al^3＋ and NaOH into wastewater containing brilliant blue FCF, anions pigments are selectively intercalated into interlayer of LDH in order to balance positive structural charge while Mg^2＋ and Al^3＋ co-precipitate and form LDH. The maximum removal efficiency of brilliant blue FCF by synthesizing LDH in situ with Mg^2＋ and Al^3＋ co-precipitates can be attained to as high as 99% when the consistency of brilliant blue FCF is 800 mg·L^-1. Results of orthogonal experiments and Ranalysis indicate that the best experimental condition to remove brilliant blue FCF from wastewater is pH value 8.5, Mg/Al ratio 3： 1, at 80℃, time of reaction is not remarkable, and the rate can amount to 99. 81%.