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›› 2008, Vol. 8 ›› Issue (5): 882-886.

• 反应与分离 • 上一篇    下一篇

粉煤灰负载水合氧化铁处理含磷(V)废水

姚淑华 刘丹 石中亮   

  1. 沈阳化工学院 应用化学系 沈阳化工学院 应用化学系 沈阳化工学院无机化学教研室
  • 收稿日期:2008-05-28 修回日期:2008-08-21 出版日期:2008-10-20 发布日期:2008-10-20
  • 通讯作者: 姚淑华

Treatment of Wastewater Containing Phosphate by Fly Ash Adsorbent Loaded with Ferrihydrite

YAO Shu-hua LIU Dan SHI Zhong-liang   

  1. Department of Applied Chemistry, Shenyang Institute of Chemical Technology Department of Applied Chemistry, Shenyang Institute of Chemical Technology Applied Chemistry College Shenyang Institute of Chemical Technology
  • Received:2008-05-28 Revised:2008-08-21 Online:2008-10-20 Published:2008-10-20
  • Contact: YAO Shu-hua

摘要: 对粉煤灰负载水合氧化铁去除水中HPO42-的性能进行了实验研究,考察了吸附剂用量、HPO42-浓度、溶液pH值、溶液共存离子等因素对吸附的影响,分析了其在不同温度下的吸附等温线及对HPO42-的吸附动力学,结果表明,Langmuir和Freundlich方程能较好地描述吸附平衡,其吸附动力学符合Lagergren二级方程. 粉煤灰经过改性对HPO42-有很强的去除能力,在吸附剂用量8.0 g/L,pH=3的条件下,粉煤灰负载水合氧化铁对HPO42-的去除率可达97%. 共存离子浓度在5~30 mg/L时,SO42-, NO32-, CO32-和Cl-等对HPO42-的去除几乎没有影响,而SiO32-的存在则明显抑制HPO42-的去除.

关键词: 粉煤灰, 水合氧化铁, HPO42-, 吸附, 废水

Abstract: The characteristics of phosphate adsorption on fly ash loaded with ferrihydrite were investigated. The influential factors such as the dosage of adsorbent, concentration of phosphate, solution pH, co-existing anions in solution on removal of phosphate ion were examined. The adsorption isotherm of phosphate on fly ash loaded with ferrihydrite could be described by the Langmuir and Freundlich equations. The adsorption kinetic data could be described by the Lagergren second-order rate equation. The adsorbent had perfect properties in phosphate adsorption capacity, the results showed that the removal rate of phosphate could be over 97% in the conditions of adsorbent dosage 8.0 g/L, and pH=3. When the concentrations of co-existing anions were 5~30 mg/L, SO42-, NO32-, CO32- and Cl- in the solution had almost no effect on the adsorption of phosphate on fly ash loaded with ferrihydrite, but SiO32- caused greater phosphate removal rate decrease.

Key words: fly ash, ferrihydrite, phosphate, adsorption, wastewater

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