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首页> 外文期刊>Arabian Journal for Science and Engineering >Evaluating Untreated Clay’s Adsorptive Capacity to Remove an Anionic Dye from Aqueous Solution
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Evaluating Untreated Clay’s Adsorptive Capacity to Remove an Anionic Dye from Aqueous Solution

机译：评估未经处理的粘土的吸附能力，以从水溶液中去除阴离子染料

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Adsorption study is conducted in batch mode, using natural clay to remove the titan yellow dye (DY9) from aqueous solution. Physical and chemical characteristics of clay are determined by XRF, XRD, FTIR, TGA and BET analyses. It is a smectite-illite clay. The Doehlert design was selected, and response surface methodology is applied to model and optimize operating parameters. The parameters studied are the initial concentration of DY9, adsorbent mass (m(ad)), pH of the solution, temperature (T) and stirring speed (v). A quadratic regression model including the significant parameters is suggested. When the pH, m(ad) and T varied, respectively, in the range of 3.4-6.0, 30-35 g L-1 and 20-30 degrees C, the removal yield varied between 93.6 and 97.6%. The kinetic modeling of adsorption shows that data follow closely pseudo-second-order and intraparticle diffusion model. The equilibrium adsorption is modeled according to the two-parameter ( Langmuir, Freundlich, Temkin and Dubinin-Radushkevich) and three-parameter (Sips, Redlich-Peterson and Toth) models. Nonlinear regression method is used to fit the data. The data fitted very well with Temkin and Sips models, and all adjusted regression coefficients values exceed 0.90, except Dubinin-Radushkevich model. These models give a maximum adsorption capacity of 5.8-6.8 mg g(-1). The Langmuir separation factor value (0 < 1) indicates that the DY9 adsorption is favorable. Thermodynamic parameters such as Delta G degrees (< 0), Delta H degrees (- 17.169 kJ mol(-1)) and.S degrees (- 0.011 kJ mol(-1) K-1) suggest that the DY9 adsorption on untreated clay is a spontaneous, exothermic and physical process with an increase in randomness at the solid/solution interface.
机译：吸附研究以分批方式进行，使用天然粘土从水溶液中去除钛黄染料（DY9）。粘土的物理和化学特性由XRF，XRD，FTIR，TGA和BET分析确定。它是蒙脱石-伊利石粘土。选择了Doehlert设计，然后将响应面方法应用于建模和优化操作参数。研究的参数是DY9的初始浓度，吸附剂质量（m（ad）），溶液的pH，温度（T）和搅拌速度（v）。建议使用包含重要参数的二次回归模型。当pH，m（ad）和T分别在3.4-6.0、30-35 g L-1和20-30摄氏度范围内变化时，去除率在93.6％和97.6％之间变化。吸附的动力学模型表明，数据严格遵循伪二级和粒子内扩散模型。根据两个参数（Langmuir，Freundlich，Temkin和Dubinin-Radushkevich）和三个参数（Sips，Redlich-Peterson和Toth）模型对平衡吸附进行建模。非线性回归方法用于拟合数据。该数据与Temkin和Sips模型非常吻合，除Dubinin-Radushkevich模型外，所有调整后的回归系数值均超过0.90。这些模型的最大吸附容量为5.8-6.8 mg g（-1）。 Langmuir分离系数值（0 <1）表示DY9吸附良好。热力学参数如Delta G度（<0），Delta H度（-17.169 kJ mol（-1）和.S度（-0.011 kJ mol（-1）K-1）表明DY9在未处理粘土上的吸附是自发的，放热的和物理的过程，固/溶液界面的随机性增加。

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