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首页> 外文期刊>Journal of Nanostructure in Chemistry >Preparation and characterization of MWCNT–COOH–cellulose–MgO NP nanocomposite as adsorbent for removal of methylene blue from aqueous solutions: isotherm, thermodynamic and kinetic studies
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Preparation and characterization of MWCNT–COOH–cellulose–MgO NP nanocomposite as adsorbent for removal of methylene blue from aqueous solutions: isotherm, thermodynamic and kinetic studies

机译：MWCNT-COOH-纤维素-MgO NP纳米复合材料的制备和表征，用于从水溶液中去除亚甲基蓝：等温线，热力学和动力学研究

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In this work, MWCNT–COOH–cellulose nanocomposite was prepared with MWCNT–COOH, SOCl2 as leaving group?and cellulose as an adsorbent (A1); MgO nanoparticles have been successfully coated on the surface of nanocomposite by directly adding to A1 (MWCNT–COOH–cellulose–MgO; A2), magnesium nitrate was added to A1 and MgO nanoparticles were achieved by coating indirectly on the surfaces (MWCNT–COOH–cellulose–MgO; A3). These nanocomposites (A1, A2, and A3) were used for the removal of methylene blue (MB) dye from aqueous solution. For characterization of adsorbent surfaces, the FT-IR, TEM, SEM, and XRD analysis were used. The effects of initial concentration of MB dye, contact time, and temperature on the adsorption were studied. According to the results, 55?min was selected as the optimum contact time for the removal process. The equilibrium data of adsorption were well fitted and the Langmuir (type III) model had the best agreement because it possesses high value of linear regression, high value R _(2), and least value of average relative error, ARE (%). Parameters of thermodynamics including enthalpy (? H _(°)), entropy (? S _(°)), and Gibbs energy (? G _(°)) were calculated. Kinetic data had best agreement with pseudo-second-order model. Graphical abstract Schematic synthesis of MWCNT–COOH–cellulose–MgO NP nanocomposite as adsorbent.
机译：在这项工作中，以MWCNT-COOH，SOCl2为离去基团和纤维素作为吸附剂制备了MWCNT-COOH-纤维素纳米复合材料（A1）。通过直接添加到A1（MWCNT–COOH–纤维素–MgO; A2）中，成功地将MgO纳米颗粒涂覆在纳米复合材料的表面上，将硝酸镁添加到A1中，并且通过在表面上间接涂覆（MWCNT–COOH–纤维素-MgO; A3）。这些纳米复合材料（A1，A2和A3）用于从水溶液中去除亚甲基蓝（MB）染料。为了表征吸附剂表面，使用了FT-IR，TEM，SEM和XRD分析。研究了MB染料的初始浓度，接触时间和温度对吸附的影响。根据结果​​，选择55？min作为去除过程的最佳接触时间。吸附的平衡数据拟合得很好，Langmuir（III型）模型具有最佳的一致性，因为它具有较高的线性回归值，较高的R _（2）和平均相对误差ARE（％）的最小值。计算了包括焓（ΔH_（°）），熵（ΔS_（°））和吉布斯能量（ΔG_（°））在内的热力学参数。动力学数据与伪二阶模型具有最佳一致性。图解法合成MWCNT–COOH–纤维素–MgO NP纳米复合材料作为吸附剂。

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