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首页> 外文期刊>Journal of Environmental Science and Health >Characteristics and kinetics of phosphate adsorption on dewatered ferric-alum residuals
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Characteristics and kinetics of phosphate adsorption on dewatered ferric-alum residuals

机译：脱水铁-铝残渣上磷酸盐吸附的特性和动力学

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摘要

The characteristics and kinetics of phosphate (P) adsorption on dewatered ferric-alum water treatment residuals (Fe-Al-WTRs) have been investigated. The existence of both aluminum (Al) and iron (Fe) in the residuals can result in significantly high P adsorption capacities. The P adsorption kinetics of Fe-Al-WTRs exhibited an initial rapid phase, followed by a slower phase. This could be described by three models, including a pseudo-first-order equation, a pseudo-second-order equation, and a double-constant rate equation. The latter was especially good for those runs with initial P concentrations of 500 and 1000 mg L~(-1). Both the Langmuir and Freundlich isotherms fit the experimental data well, particularly the Freundlich isotherm, which had a correlation coefficient of 0.9930. The maximum measured P adsorption capacity of Fe-Al-WTRs was 45.42 mg g~(-1), which is high when compared to those of most WTRs, as well as other reported adsorbents. The results also show that the P adsorption is a spontaneous endothermic process. Highest P adsorption capacities of Fe-Al-WTRs were measured at low pHs and a particle size range of 0.6 to 0.9 mm.
机译：研究了磷酸盐（P）在脱水铁铝水处理残留物（Fe-Al-WTRs）上的吸附特性和动力学。残留物中同时存在铝（Al）和铁（Fe）会导致显着高的P吸附能力。 Fe-Al-WTRs的P吸附动力学表现为初始的快速相，随后是较慢的相。这可以用三个模型来描述，包括伪一阶方程，伪二阶方程和双常数速率方程。后者对于初始P浓度为500和1000 mg L〜（-1）的运行特别有用。 Langmuir等温线和Freundlich等温线都非常适合实验数据，尤其是Freundlich等温线，其相关系数为0.9930。 Fe-Al-WTRs的最大测得P吸附容量为45.42 mg g〜（-1），与大多数WTRs和其他报道的吸附剂相比，该值很高。结果还表明，P吸附是自发的吸热过程。 Fe-Al-WTR的最高P吸附能力是在低pH值和0.6至0.9 mm的粒径范围内测得的。

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  • 来源
    《Journal of Environmental Science and Health》 |2011年第14期|p.1632-1639|共8页
  • 作者

    CHANGHUI WANG; WEI GUO; BINGHUI TIAN; YUANSHENG PEI; KEJIANG ZHANG;

  • 作者单位

    The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing, P.R. China;

    The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing, P.R. China;

    Research Center for Eco-Environmental Sciences, Chinese Academy of Science, Beijing, P.R. China;

    The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing, P.R. China;

    Department of Civil Engineering, University of Calgary, Calgary, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    phosphate; adsorption; ferric-alum residuals; kinetics;

    机译：磷酸盐吸附铁铝残渣;动力学;

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