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首页> 外文期刊>Soil Science Society of America Journal >Impact of Structural Perturbation of Aluminum Hydroxides by Tannate on Arsenate Adsorption
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Impact of Structural Perturbation of Aluminum Hydroxides by Tannate on Arsenate Adsorption

机译：鞣酸盐对氢氧化铝的结构扰动对砷酸盐吸附的影响

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The impacts of the biomolecule-induced structural perturbation of Al hydroxides and the resultant alteration of their surface reactivity toward the adsorption of nutrients and contaminants have received, to date, scant attention, in spite of their significance in determining the mineralogy and surface chemistry of these mineral colloids. This study investigated the equilibria and kinetics of As(V) adsorption on a crystalline Al hydroxide, a pure amorphous Al hydroxide and a short-range ordered Al–tannate coprecipitate. Isotherms and kinetics of As(V) adsorption were conducted at pH 6.5; the kinetic experiments (0.083–24 h) were performed at 288, 298, 308, and 318 K. The adsorption data followed multiple second-order kinetics, with an initial fast reaction step, followed by a slow reaction. While As(V) adsorption on the crystalline Al hydroxide was a rapid process, the poorly ordered minerals required longer contact intervals and greater activation energies. Compared with the pure amorphous Al hydroxide, the incorporation of tannate into the structural network of Al hydroxide decreased the adsorption rate, capacity, and affinity for As(V). These effects were attributable to the blocking of part of the adsorption sites by tannate, to the electrostatic repulsion induced by the net negative charge caused by the deprotonated organic molecules exposed on the surface of the Al–tannate coprecipitate, and to the steric hindrance of tannate, hampering access of the adsorbate to the micropores. These findings are of fundamental significance in understanding the sorption behavior and mobility of As as influenced by biomolecule-induced structural perturbation of Al hydroxides in the environment.
机译：已经收到了生物分子引起的氢氧化铝结构扰动的影响及其表面 反应性对营养物质和污染物吸附的改变 ，迄今为止，尽管它们在确定这些 矿物胶体的矿物学和表面化学方面具有重要意义 。这项研究研究了结晶氢氧化铝，纯非晶态氢氧化铝和短程有序Al–鞣酸Al的As（V）吸附的平衡和动力学[sup> 共沉淀。在pH 6.5时， 进行了As（V）吸附的等温线和动力学。动力学实验（0.083–24 h）在288、298、308和318 K下进行。吸附 数据遵循多个二级动力学，初始< sup> 快速反应步骤，然后缓慢反应。 As（V） 在结晶氢氧化铝上的吸附是一个快速过程， 不良有序的矿物需要更长的接触间隔 和更大的活化能。与纯无定形 氢氧化铝相比，将鞣酸盐掺入氢氧化铝的结构 网络降低了对铝的吸附速率，容量， 和亲和力。 As（V）。这些影响归因于鞣酸对 的部分吸附位阻滞，归因于由 引起的净负电荷引起的 静电排斥。暴露于铝酸铝共沉淀物表面 上的去质子化有机分子，以及暴露于单酸铝酸盐的空间位阻 ，从而阻碍了被吸附物进入微孔。 这些发现对于理解 受环境中氢氧化铝的生物分子诱导的 结构扰动影响的As的吸附行为和迁移率具有根本意义。 / sup>

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    《Soil Science Society of America Journal》 |2009年第5期|1664-1675|共12页
  • 作者

    M. Martin; G. Yu; E. Barberis; A. Violante; L. M. Kozak; P. M. Huang;

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    Dep. of Soil Science, Univ. of Saskatchewan, 51 Campus Dr. Saskatoon, SK Canada S7N 5A8,Università di Napoli Federico II, Dipartimento di Scienze del Suolo, della Pianta, dell'Ambiente e delle Produzioni Animali, Via Università, 100- 80055 Portici (NA), Italy;

    Institute of Soil Science, Chinese Academy of Sciences, 210008 Nanjing, China,Università di Napoli Federico II, Dipartimento di Scienze del Suolo, della Pianta, dell'Ambiente e delle Produzioni Animali, Via Università, 100- 80055 Portici (NA), Italy;

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