限域于介孔孔道中的纳米零价铁对三硝基甲苯的降解

发布时间：2018-01-30 22:36

  本文关键词： 有序介孔材料 纳米零价铁 三硝基甲苯 双溶剂法 还原　出处：《水处理技术》2017年09期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The ordered mesoporous material Zr-Ce-SBA-15 of hexagonal plate with short pore channel was used as the carrier. The nanocomposite with zero valence iron (nZVI) in the ordered mesoporous channel was synthesized by double solvent impregnation and calcination Hs2 reduction method. The composite was used to treat TNT with trinitrotoluene (TNT). The reduction properties of TNT, the amount of iron loaded in the composite and the effect of pH on the removal rate of TNT were investigated. The results showed that the amount of iron load and dosage of the composite was increased. The removal rate of TNT in the solution was increased, and the acid condition could promote the reaction and increase the removal rate of TNT. The basic condition is the opposite. The initial mass concentration of nZVI/Zr-Ce-SBA-15 is 20mg / L at the dosage of 1 g / L ~ (-1) L ~ (-1) L ~ (-1), using nZVI/Zr-Ce-SBA-15 composite with a molar ratio of 0. 15 to Fe ~ (2 +) ~ (2 +). The removal rate of TNT in the solution was 98.4 when pH was 3:00. The FTIR analysis of the products of the TNT reduction reaction showed that the TNT in the composite was reduced to amino compound by nZVI.
【作者单位】： 江苏城市职业学院环境与生态学院;南京理工大学环境与生物工程学院;
【基金】：国家自然科学基金资助项目(51078184) 高等学校科技创新工程重大项目培育资金项目(708049) 江苏省自然科学基金资助(BK2009392)
【分类号】：TB33;X703
【正文快照】： 纳米零价铁(n ZVI)粒径小、活性高、价格低廉、自身以及氧化产物对环境友好等优点,在环境修复中具有显著的优势和发展前景。目前,在降解有机卤代物、有机染料、重金属离子以及硝基芳香烃化合物等方面都取得了很好的效果[1-5]。但是n ZVI颗粒粒径小,容易发生团聚使其比表面积降，

本文编号：1477414