改性凹凸棒土负载纳米零价铁的制备及降解亚甲基蓝的研究

Preparation of Modified Attapulgite-loaded Nano-zero-valent Iron and Study on Degradation of Methylene Blue

采用化学液相还原法制备凹凸棒土负载零价铁复合材料,优化了复合材料的制备工艺,并选择水体中具有代表性的有机污染物亚甲基蓝作为降解的目标污染物,探讨了影响亚甲基蓝降解的因素。复合材料制备的最佳工艺条件为:铁土比1:3,KBH4浓度为0.075mol/L,反应时间3h。复合材料对亚甲基蓝溶液降解的最佳条件为:温度30℃,pH值为4,反应时间10min,50mg复合材料可将25mL浓度为300mg/L的亚甲基蓝降解到10mg/L以下,降解率达到95%以上。

The attapulgite-loaded zero-valent iron composites were prepared by chemical liquid phase reduction method.The preparation process of composites was optimized.The representative organic pollutants methylene blue was selected as the target pollutant for degradation.The degradation of methylene blue was discussed.factor.The optimum technological conditions for the preparation of composite materials are:iron to soil ratio 1:3,KBH 4 concentration is 0.075mol/L,and reaction time is 3h.The optimum conditions for the degradation of methylene blue solution by composite materials are:temperature 30℃,pH 4,reaction time 10 min,50 mg composite material can degrade 25 mL of 300 mg/L methylene blue to below 10 mg/L,and the degradation rate is over 95%.