环境化学
梁咏梅,何利华,仇荣亮,刘伟.焙烧温度对铁覆膜砂IOCS吸附Cr(VI)的影响[J].环境科学学报,2007,27(11):1887-1891
焙烧温度对铁覆膜砂IOCS吸附Cr(VI)的影响
- The effect of coating temperature on the adsorption of chromate (VI) onto iron-oxide-coated sand
- 基金项目：广东省科技计划项目(No.2005B33301001)
- 作者
- 单位
- 梁咏梅
- 中山大学环境科学与工程学院, 广州 510275
- 何利华
- 中山大学环境科学与工程学院, 广州 510275
- 仇荣亮
- 中山大学环境科学与工程学院, 广州 510275
- 刘伟
- 中山大学环境科学与工程学院, 广州 510275
- 摘要：采用序批试验研究了焙烧温度对铁覆膜砂(IronOxideCoatedSand,IOCS)吸附6价铬Cr(VI)的吸附平衡和吸附速率的影响.结果表明,铬在IOCS上的吸附平衡符合Langmuir吸附模型.低温制备IOCS具有较高吸附容量且对pH不敏感.110℃制备IOCS在pH7的最大吸附容量(0.181mg·g-1)远高于660℃制备IOCS(0.023mg·g-1).吸附过程符合准二级动力学模型.吸附速率随焙烧温度提高而下降.
- Abstract：The impact of coating temperature on the adsorption equilibrium and adsorption rate of Cr(VI) onto iron-oxide coated sand (IOCS) was investigated by batch tests. It was found that the Langmuir adsorption isotherm properly described the adsorption equilibrium of the Cr(VI) by IOCS. IOCSsynthesized at lower coating temperatures had a higher adsorption capacity and the adsorption equilibrium was less sensitive to pH. Maximum adsorption of Cr(VI) at pH7 for IOCSsynthesized at 110℃ was found to be much higher (0.181 mg·g-1) than that (0.023 mg·g-1) for IOCSsynthesized at 660℃. The adsorption kinetics fit a pseudo-second-order rate model well. The adsorption rate decreased with increased coating temperature.
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