粉煤灰的活化及其对活性深蓝K-R的吸附

Activation of fly ash and its adsorption for reactive deep blue K-R

以粉煤灰(FA)经碱熔融和酸处理制得活性粉煤灰(AFA),并将其用于模拟废水中活性深蓝K-R的吸附,探讨了AFA的制备条件和影响吸附的因素。结果表明:在m(Na2CO3)∶m(FA)为1∶5,焙烧温度为850℃,HCl浓度为4mol/L,搅拌溶解温度为80℃的制备条件下,所制得的AFA对3500mg/L活性深蓝K-R的吸附量为335.98mg/g,活性深蓝K-R去除率达94.5%;染料起始浓度、pH、吸附时间和温度均对吸附效果产生影响;吸附动力学可用准二级吸附动力学方程进行描述(R2=1.000);等温吸附符合Langmuir方程。AFA可有效去除水溶液中高浓度的活性深蓝K-R。

Activated fly ash （AFA） has been prepared by fly ash which was alkali-melted and acid treated. It can be used for the adsorption of reactive deep blue K-R from simulated wastewater. The optimal preparation conditions of AFA and the factors that affect adsorption are discussed. The results show that when m （Na2CO3）：m （FA） is 1：5, calcination temperature 850 ,HC1 concentration 4 mol/L,and stirring solution temperature 80 ℃ ,the adsorption capacity of prepared AFA for 3 500 mg/L of reactive deep blue K-R is 335.98 mg/g, and the removing rate of reac- tive deep blue K-R reaches 94.5%. The initial concentration of dye,pH, and adsorption time and temperatare all have effects on adsorption effectiveness. Adsorption kinetics can be described by pseudo-second-order kinetic equa- tion （R2=1.000）. The adsorption isotherm agrees with the Langmuir equation. AFA is an effective adsorbent for the removal of reactive deep blue K-R with high concentration from aqueous solution.