即时合成层状双氢氧化物法去除阴离子染料刚果红

Treatment of Wastewater Containing Congo Red by Synthesizing Layer Double Hydroxide in Situ

利用层状双氢氧化物(LDH)合成原理,提出了即时合成LDH处理染料废水的方法,并对其可行性进行了实验研究。该方法的基本原理是由于Mg2+,Al3+水解共沉淀形成LDH,阴离子染料优先进入LDH结构层间平衡结构电荷,从而使阴离子染料以LDH沉淀的形式被去除。探讨了反应时间,pH,n(Mg2+):n(Al3+)及温度对染料去除率的影响。结果表明,在常温下,最佳pH为9.0,反应时间为2 h,n(Mg2+):n(Al3+)为2:1,对刚果红染料的去除率可达100%,效果十分显著。

The layer double hydroxide （LDH） synthesis principle was applied to develop the method of treating dyeing wastewater by synthesizing LDH in situ, and the feasibility of the method was experimented. The principle of the method can be described as follows：Mg^2＋and Al^3＋ hydrolyze and form Mg^2＋ / Al^3＋ -LDH, anions dyestuff are selectively intercalated into interlayer of LDH in order to balance positive structural charge, and the anion dyestuff in wastewater is removed by LDH synthesis in situ. The principle has been elaborated by wastewater experimental simulation and sediment structure analysis. The influence of time, pH, Mg^2＋/Al^3＋ ratio, and temperature of reaction on the removal of anion dyestuff was studied. The maximum removal efficiency of anion dyestuff can be attained when pH is 9.0, n（Mg^2＋ ）： n（Al^3＋ ） is 2：1 ,and time of reaction is 2 h, and the rate can amounts to 100% . This technology has present extraordinary efficiency of wastewater treatment.