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首页> 外文期刊>Soil Science Society of America Journal >The Influence of pH, Electrolyte Type, and Surface Coating on Arsenic(V) Adsorption onto Kaolinites
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The Influence of pH, Electrolyte Type, and Surface Coating on Arsenic(V) Adsorption onto Kaolinites

机译:pH,电解质类型和表面涂层对高岭石上砷(V)吸附的影响

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摘要

The adsorption of arsenate (As[V]) has been investigated through batch experiments using two solid phases: a purified kaolinite and a kaolinite coated with humic acid (HA). The influence of various chemical parameters on As(V) adsorption onto kaolinite are examined, namely initial As concentration, pH, electrolyte type (Ca and Na) and concentration, and the presence or absence of a HA coating on the kaolinite surface. In Na electrolyte, As(V) adsorption onto kaolinite and HA-coated kaolinite is pH-dependent. In Ca media, however, As(V) adsorption onto kaolinite is not pH-dependent, and pH has only a minor influence on As(V) adsorption onto kaolinite coated with HA. Depending on electrolyte type, the adsorption of As(V) respectively onto kaolinite and HA-coated kaolinite differs considerably. In NaNO3, As(V) adsorption is lower in the presence of HA regardless of the pH value, whereas in Ca(NO3)2, adsorption of As(V) onto HA-coated kaolinite is greater than onto kaolinite alone above pH 5. The effect of Ca on As(V) adsorption thus appears complex and concerns both As(V) speciation in solution and the kaolinite adsorption site level. In addition, a decrease in the Ca concentration of the electrolyte decreases As(V) adsorption onto both solids.
机译:已通过分批实验使用两种固相研究了砷酸盐(As [V])的吸附:两个固相:纯化的高岭石 和涂有腐殖酸(HA)的高岭石。研究了 各种化学参数对高岭石 上As(V)吸附的影响,即初始As浓度,pH,电解质 类型(Ca和Na)和浓度,以及高岭石表面上是否存在HA涂层 。在Na电解质中, As(V)吸附在高岭石上和HA包覆的高岭石是pH值依赖的。 在Ca介质中,As(V)吸附在高岭石上并不 pH依赖,并且pH对As(V)在HA包覆的高岭石上的As(V)吸附 仅有很小的影响。取决于电解质类型, 分别将As(V)吸附在高岭石上和HA涂覆的 高岭石上。在NaNO 3 中,无论pH值如何,在HA存在下,As(V)的吸附量 较低,而Ca(NO 3 2 ,在pH高于5的情况下,As(V)在HA包覆的高岭石上的吸附量大于单独在高岭石上的吸附量。的影响 Ca对As(V)的吸附似乎很复杂,既涉及溶液中的 As(V)形态,也涉及高岭石的吸附位点 。此外, 电解质中Ca浓度的降低会降低As(V)吸附到两种固体上。

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  • 来源
    《Soil Science Society of America Journal》 |2003年第4期|1127-1132|共6页
  • 作者单位

    Unité de Sciences du Sol, INRA d'Orléans, av. de la Pomme de pin, BP 20619, Ardon, 45166 Olivet Cedex, France,Bureau de Recherches Géologique et Minière (BRGM), 3 avenue Claude Guillemin-B.P. 6009–45060 Orléans Cedex 2, France;

    Unité de Sciences du Sol, INRA d'Orléans, av. de la Pomme de pin, BP 20619, Ardon, 45166 Olivet Cedex, France,Bureau de Recherches Géologique et Minière (BRGM), 3 avenue Claude Guillemin-B.P. 6009–45060 Orléans Cedex 2, France;

    Unité de Sciences du Sol, INRA d'Orléans, av. de la Pomme de pin, BP 20619, Ardon, 45166 Olivet Cedex, France,Bureau de Recherches Géologique et Minière (BRGM), 3 avenue Claude Guillemin-B.P. 6009–45060 Orléans Cedex 2, France;

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