Fe_3O_4@SiO_2-TiO_2磁性介孔复合材料光催化降解亚甲基蓝的性能研究

Study on Magnetic Fe_3O_4@mesoSiO_2-TiO_2 Mesoporous Composites Photocatalytic Degradation of Methylene Blue

染料废水处理是水污染治理中非常重要内容之一,针对染料废水带有极高的色度、可生化性差和含"三致"物等特点。本文采用水热法制备复合材料用于染料废水处理。通过XRD、TEM、SBET等表征手段证实制备材料为核-壳Fe3O4@SiO2-TiO2复合材料。将此材料用于染料废水处理,选用亚甲基蓝(Methylene Blue,简称MB)作为染料废水典型目标物,测定催化剂Ti:Si摩尔比、催化剂用量、染料溶液pH值和催化剂重复利用对染料废水降解效果影响。研究结果表明,染料废水浓度为14mg/L,双氧水用量为2mL,催化剂用量为2g/L,脱色90min时,溶液脱色率能达到98.6%。催化剂重复使用4次,其脱色效果仍然保持在90%左右。由此可见,用此方法制备的核-壳材料是比较有效且实用的一种染料废水处理非均相Fenton催化剂。

Dyestuff textile wastewater treatment has become a research hotspot due to it ’s high chroma ,poor biodegradability ,and low toxicity characteristics .In this paper ,we have synthesized composite materials by hydrothermal methods .Core-shell Fe3 O4@ SiO2 -TiO2 materials were characterized by XRD ,TEM and so on .This materials have been applied to dye wastewater treatment . Methylene blue was used as typical target of dye wastewater .Degradation effects of dye wastewater were determined by catalyst with different Ti ：Si molar ratios ,amount of catalyst ,pH value of the dye solution and catalyst reuse . A serious of results of study show that decolorization ratios of dye wastewater arrived at 98 .6% under optimal conditions .When catalysts were reused for 4 times ,it’s decolorization ratios were maintained at about 90% . Therefore , this materials synthesized by this methods is an effective and practical dye wastewater treatment catalysts .