黄铵铁矾的制备及其催化性能

Preparation and catalytic activity of ammoniojarosite

以铁泥为原料,经酸浸、过滤、加入硫酸铵、调节pH等工序制得黄铵铁矾((NH4)Fe3(SO4)2(OH)6)。采用X线衍射、扫描电子显微镜、N2吸附脱附等手段对其进行表征。在H2O2/(NH4)Fe3(SO4)2(OH)6类Fenton条件下,对亚甲基蓝(MB)溶液进行处理。考察各种因素对溶液中MB的去除的影响。研究结果表明:在酸性媒介中黄铵铁矾能有效去除水溶液中的MB,去除率随H2O2浓度的增加而增加。100 mL H2O2浓度为11.4 mmol/L,pH为5.6,MB质量浓度为100 mg/L,(NH4)Fe3(SO4)2(OH)6质量浓度为0.9 g/L的水溶液,在80℃时反应20 min后MB的去除率达到99%以上,催化剂循环使用重复性良好。

A new technology for the preparation of ammoniojarosite by sulfuric acid from iron sludge of industry was studied.Process for preparation of ammoniojarosite included acid-leaching,filteration,swing in with ammonium sulfate and adjusted pH.The samples were characterized by N2 adsorption-desorption,X-ray diffraction and scanning electron microscopy.Methylene blue solution was treated with water-bath in the presence of hydrogen peroxide and ammoniojarosite.All kinds of influencing factors were investigated.The experimental results show that methylene blue can be more efficiently removed in acid media,and the removal rate increases with the increase of concentration of H2O2.The removal rate of 100 mL MB of 100 mg/L can reach 99% after reaction for 20 min in the presence of 1.14 mmol hydrogen peroxide and 0.9 g/L ammoniojarosite with pH=5.6.The catalytic activity of ammoniojarosite is maintained after repeated use for many times.