采用溶胶-凝胶法制备了纳米TiO2,并以TiO2和镁盐溶液为前驱物用氨气鼓泡法制得了TiO2/Mg (OH)2复合材料.利用氢氧化镁在水溶液中较强的吸附能力和TiO2对有机物的催化降解作用,研究TiO2/Mg (OH)2复合材料对有机污水中的甲基橙暗反应吸附规律和光反应催化降解性能.结果表明:当TiO2/Mg (OH)2加入量为1 g·L-1时,在可见光下照射180 min后,对有机污水中含20 mg ·L-1的甲基橙的降解率达到98.00%,同时在同等条件下选用国家标准(30 mg ·L-1亚甲基蓝溶液)作为参照时,降解率可达99.20%.TiO2/Mg(OH)2复合材料对污水中甲基橙的催化降解反应较好地符合Langmuir动力学模型,可用一级反应动力学方程进行描述.
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