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首页> 外文期刊>Environmental Processes >The Use of an Organo-Kaolinite Sorbent in a Permeable Reactive Barrier for Remediating Groundwater Contaminated with Methylene Blue Dye: Experimental and Theoretical Investigation
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The Use of an Organo-Kaolinite Sorbent in a Permeable Reactive Barrier for Remediating Groundwater Contaminated with Methylene Blue Dye: Experimental and Theoretical Investigation

机译：在可渗透的反应屏障中使用有机高岭石吸附剂，用于修复用亚甲基蓝染料污染的地下水：实验和理论研究

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The removal of aqueous methylene blue (MB) dye using organically modified natural Na-kaolinite was optimized. Organo-kaolinite was synthesized by replacing exchangeable Na~+ ions in Na-kaolinite with cetyltrimethylammonium bromide (CTAB), and the adsorption behaviour was systematically explored as an efficient adsorbent for the removal of dyes. Furthermore, the properties of the obtained samples were characterized by FTIR spectro-photometric analysis, which confirmed that CTAB cations had modified the kaolinite to possess a new functional group. Batch mode experiments were conducted to test the performance of the modified kaolinite in removing MB dye to optimize the following experimental conditions: adsorbent quantity, initial concentration, mixing speed, contact time and initial pH. The findings indicated that the MB adsorbent efficiency could reach up to 100% when the above conditions were set at 0.3 g/100 mL, 50 mg/L, 200 rpm, 60 min and pH= 12, respectively. The adsorption isotherms and kinetics of the organic-modified kaolinite for MB concurred with Freundlich adsorption equation and the pseudo-second-order kinetics, respectively. In accordance with the principles of environmental preservation and reuse of waste, granulated glass waste was used to optimize the adsorption efficiency of kaolinite. Furthermore, two tested reactive systems were used in two-dimensional (2D) domain experiments by mixing a 1:1 ratio of modified kaolinite:granulated glass waste. The COMSOL Multiphysics 3.5a software was utilized to determine the spread of MB within the permeable reactive barrier (PRB) for the 2D domain at equilibrium conditions.
机译：优化使用有机改性的天然Na-Koolinite除去亚甲基蓝（MB）染料的水溶液。通过用甲酰基三甲基铵（CTAB）替换Na-Koolinite中的可交换Na〜+离子来合成有机高岭石，并系统地探索吸附行为作为去除染料的有效吸附剂。此外，通过FTIR光谱 - 光度分析表征获得的样品的性质，证实CTAB阳离子已改性高岭石具有新的官能团。进行批量模式实验以测试改性高岭石的性能在去除MB染料中以优化以下实验条件：吸附量，初始浓度，混合速度，接触时间和初始pH。结果表明，当上述条件设定为0.3g / 100ml，50mg / L，200rpm，60 min和pH = 12时，Mb吸附效率可达高达100％。分别用Freundlich吸附方程和伪二阶动力学同意的MB的吸附等温物和有机改性高岭石的动力学。按照环境保护和废物再利用的原理，使用粒状玻璃废物来优化高岭石的吸附效率。此外，通过混合改性高岭石的比例：粒状玻璃废物的1：1的比例，在二维（2D）结构域实验中使用两种测试的反应性系统。 COMSOL多体学3.5A软件用于在平衡条件下确定2D结构域的可渗透反应屏障（PRB）内MB的扩散。

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