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首页> 外文期刊>Journal of Colloid and Interface Science >Influence of humic acids on the adsorption of Basic Yellow 28 dye onto an iron organo-inorgano pillared clay and two Hydrous Ferric Oxides
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Influence of humic acids on the adsorption of Basic Yellow 28 dye onto an iron organo-inorgano pillared clay and two Hydrous Ferric Oxides

机译：腐殖酸对碱性黄28染料在有机-无机柱状铁粘土和两种含水三价铁氧化物上的吸附的影响

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摘要

Effect of humic acids (HAs), macromolecules from natural organic matter, on the adsorption of Basic Yellow 28 is the aim of the present work. Three adsorbents were investigated in this study: an iron organo-inorgano pillared clay and two synthetic Hydrous Iron Oxide (Goethite and HFO). The surface charge was positive in the pH range of this study for the pillared clay; in contrast, it changes from positive to negative when the pH value increased (pH>9) for the two (oxy)hydroxides. Pseudo-first order kinetic rate constants and adsorption capacities increase from humic acid to BY 28. Adsorption isotherms of BY 28 and HA in single component were analysed using the Freundlich equation. Adsorption capacities increased sharply when the pH value of the dye solution was raised from 3 to 9. Increasing the pH medium from 3 to 9 reduces the HA adsorption capacities onto Fe-SMPM and iron oxyhydroxides, respectively. Fitting between measured and predicted sorption capacities of BY 28 and HA in a binary component system indicates that the Sheindorf-Rebuhn-Sheintuch (SRS) model, an extended Freundlich model, is able to describe the simultaneous adsorption of BY 28 and HA. Humic acids favourably affect the adsorption of BY 28, and a cooperative mechanism could be suggested. The synergetic effect existing between BY 28 and HA is shown by the interaction coefficients η_(12), which are generally high and increase with pH. Some phenomena have been advanced to explain this mechanism.
机译：天然有机物大分子腐殖酸（HAs）对碱性黄28吸附的影响是本研究的目的。在这项研究中研究了三种吸附剂：一种有机-无机铁柱状粘土和两种合成的含水氧化铁（针铁矿和HFO）。在本研究的pH范围内，带柱粘土的表面电荷为正。相反，当两种（羟基）氢氧化物的pH值增加（pH> 9）时，它从正变为负。伪一级动力学速率常数和吸附容量从腐殖酸增加到BY28。使用Freundlich方程分析BY 28和HA在单一组分中的吸附等温线。当染料溶液的pH值从3增加到9时，吸附能力急剧增加。将pH介质从3增加到9会分别降低HA对Fe-SMPM和羟基氧化铁的吸附能力。在二元组分系统中测量和预测的BY 28和HA吸附容量之间的拟合表明，Sheindorf-Rebuhn-Sheintuch（SRS）模型（扩展的Freundlich模型）能够描述BY 28和HA的同时吸附。腐殖酸有利地影响了BY 28的吸附，并且可以提出一种协同机制。 BY 28和HA之间存在的协同效应由相互作用系数η_（12）表示，该系数通常较高，并随pH的增加而增加。已经提出了一些现象来解释这种机制。

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