球形氧化镁的合成及氧化降解含酚废水应用

Synthesis of spherical magnesia and application in degradation of phenolic wastewater

以硫酸镁及氨水为原料,经静态反应制备出花球状氢氧化镁前驱体。然后经氢氧化钠溶液处理后,球形颗粒表面变得光滑,得到纯度较高的球形氢氧化镁产物,再经煅烧得到产物球形MgO。实验过程采用XRD、SEM等分析手段对所得产品进行表征,并进行柠檬酸活性测试及氧化降解含酚废水应用。结果表明,600℃下煅烧2 h能够得到较高活性的单分散性良好的球形MgO,且在臭氧氧化降解含酚废水实验中能够明显促进苯酚的降解。

Spherical magnesium hydroxide with a curd-like could be successfully prepared by magnesium sulfate and ammonia water.And its surface was formed by criss-crossed plate-particles.After processed by sodium hy-droxide solution,the products with smooth surface would be obtained,and the content of SO 2 -4 in the products would decrease substantially.And after being calcined,spherical magnesium oxide would be got.The obtained materials were characterized by X-ray diffraction,scanning electron microscopy,TG-DAT,tested of CAA and application performance.The results showed that the products spherical magnesium oxide with high activity and good monodispersity could been obtained calcining at 600 ℃ for 2 h,and would promote degradation of phenol in the catalytic ozonation experiments.