• 关键词：纳米复合材料  阳离子交换树脂  水合氧化铁  铁溶出  EDTA  共存离子

• 基金项目：国家自然科学基金(No.21177059);江苏省杰出青年基金(No.BK2012017);江苏省社会发展项目(No.BE2012160)

• 安东
• 污染控制与资源化研究国家重点实验室, 南京大学环境学院, 南京 210023

• 张孝林
• 污染控制与资源化研究国家重点实验室, 南京大学环境学院, 南京 210023

• 牛英杰
• 污染控制与资源化研究国家重点实验室, 南京大学环境学院, 南京 210023

• 吕路
• 污染控制与资源化研究国家重点实验室, 南京大学环境学院, 南京 210023

• 潘丙才
• 污染控制与资源化研究国家重点实验室, 南京大学环境学院, 南京 210023

• 摘要：通过液相沉积法制备了以大孔阳离子交换树脂D001为载体的纳米水合氧化铁复合材料(HFO-D001),考察了不同溶液pH值(3~7)下EDTA (0~20 mg·L^-1)对HFO-D001中铁溶出行为的影响.结果表明,在较强酸性(pH=3)条件下,HFO-D001的铁溶出量随着EDTA浓度的增加而增大;在pH=5或7时,由于树脂刚性骨架的保护作用及EDTA与树脂磺酸基团之间的静电斥力,EDTA的存在几乎不会造成HFO-D001中铁的溶出.同时,考察了Cu²⁺、Ni²⁺等离子共存时EDTA对HFO-D001中Fe(Ⅲ)溶出性能影响,发现Cu²⁺、Ni²⁺等共存阳离子(0~2 mg·L^-1)在一定程度上抑制了 HFO-D001中Fe(Ⅲ)的溶出.

• Abstract：Application of environmental nanocomposites in water/wastewater treatment has attracted increasing attention because of its excellent performance in removal of target pollutants. In the present study, we prepared a polymer-supported hydrated ferric oxide (HFO-D001) through chemical liquid deposition technique. Fe(Ⅲ) dissolution of HFO-D001 in the presence of EDTA in solution under various experimental conditions, such as EDTA concentration, dissolution time, solution pH and coexisting ions, were examined. At pH=3, Fe(Ⅲ) dissolution from HFO-D001 was enhanced significantly as EDTA concentration increased. However, under pH=5 and 7, negligible Fe(Ⅲ) was detected in solution due to the protection of the polymer host and the electrostatic repulsion between EDTA and sulfonic acid groups of D001. Meanwhile, the coexisting cations such as Cu²⁺or Ni²⁺ (0~2 mg·L^-1) could inhibit Fe(Ⅲ) dissolution to a certain degree.

• Key words：nanocomposite  cation exchange resin  hydrated ferric oxide  Fe(Ⅲ) dissolution  EDTA  coexisting ions

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