氢氧化镁对废水中活性艳兰染料的吸附研究

Adsorption of the Reactive Brilliant Blue from Dye Wastewater by Magnesium Hydroxide

为了解决活性染料废水处理难的问题,提出了以氢氧化钠和硫酸镁为原料,通过水热法制备氢氧化镁用于吸附活性艳兰的技术。X射线衍射和扫描电子显微镜等表征表明氢氧化镁晶体结构完整;吸附动力学拟合表明氢氧化镁对活性艳兰染料的吸附过程符合伪二级模型;等温线拟合表明氢氧化镁对活性艳兰染料的等温吸附过程符合朗格缪尔模型,其饱和吸附量达41.26 mg/g。因此,氢氧化镁对活性艳兰吸附具有吸附快、饱和吸附量高等优点。

To solve the problem of difficult treatment of reactive dye wastewater,a new technology was reported for adsorption the reactive brilliant blue dye by using magnesium hydroxide,which prepared from sodium hydroxide and magnesium sulfate via the hydrothermal method.A complete crystal structure of magnesium hydroxide was verified through the characterization analysis of the X-ray diffraction and scanning electron microscopy.The adsorption kinetics fitting showed that the adsorption process of magnesium hydroxide removing reactive brilliant blue dye was conformed to the Pseudo-second-order model.The isotherm fitting demonstrated that the Langmuir model was the suitable equation to describe the isotherm adsorption process.The saturated adsorption capacity was 41.26 mg/g.Therefore,the advantages of fast adsorption and high saturated adsorption capacity were presented for the technology of magnesium hydroxide adsorption activated brilliant blue.