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以短孔道的六方板有序介孔材料Zr-Ce-SBA-15为载体,采用双溶剂浸渍-煅烧-H_2还原的方法合成纳米零价铁(nZVI)限域在有序介孔孔道内的复合材料。用这一复合材料处理三硝基甲苯(TNT),考察其对TNT的还原性能以及复合材料的载铁量、投加量、pH对TNT去除率的影响。结果表明,加大复合材料铁负载量和投加量,溶液中TNT的去除率增大,酸性条件能促进反应进行,提高TNT的去除率,碱性条件则相反。采用铁硅摩尔比为0.15的nZVI/Zr-Ce-SBA-15复合材料,在投加量为1g/L、TNT初始质量浓度为20mg/L、pH为3时,溶液中TNT的去除率为98.4%。对TNT还原反应产物的傅里叶红外光谱步析表明,复合材料中的nZVI将TNT还原为氨基化合物。
The mesoporous material with hexagonal ordered mesoporous Zr-Ce-SBA-15 was used as a carrier to synthesize nanoclusters with nZVI in ordered mesoporous channels by double solvent impregnation-calcination-H2 reduction Composites. Trinitrotoluene (TNT) was treated with this composite material to investigate the reduction of TNT and the effect of loading amount of iron, dosage and pH on TNT removal. The results show that when the loading and dosage of composite iron are increased, the removal rate of TNT in solution increases. The acidic conditions can promote the reaction and improve the removal rate of TNT. The alkaline conditions are the opposite. When the dosage of nZVI / Zr-Ce-SBA-15 with FeSi molar ratio of 0.15 was 1g / L, the initial concentration of TNT was 20mg / L and pH was 3, the removal rate of TNT in the solution was 98.4%. Fourier transform infrared spectroscopy of the TNT reduction reaction product showed that nZVI in the composite reduced TNT to an amino compound.