Tanweer Mohd Saquib, Iqbal Zafar, Alam Masood
Environmental Science Research Lab, Department of Applied Sciences and Humanities, Faculty of Engineering and Technology, Jamia Millia Islamia, New Delhi 110025, India.
Langmuir. 2022 Jul 26;38(29):8837-8853. doi: 10.1021/acs.langmuir.2c00889. Epub 2022 Jul 11.
This work presents the preparation of inorganic-organic hybrid nanocomposites, namely three-dimensional polyaniline (Pani)/activated silica gel (ASG) (3D Pani@ASG), their characterization, and in removing application as a potential adsorbent for cationic brilliant green (BG), crystal violet (CV), and anionic Congo red (CR), and methyl orange (MO) dyes. Pani@ASG nanocomposites have been prepared by the polymerization method and characterized using various techniques such as Fourier transform infrared (FTIR), X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) with selected area electron diffraction, thermogravimetric analysis with derivative thermogravimetry, zeta potential analyses, and Brunauer-Emmett-Teller (BET). The scanning electron microscopy (SEM) study confirms the average particle size of the Pani@ASG nanocomposite is in the range of 5 nm. FESEM, TEM, FTIR, and XRD analysis proved the successful decoration of ASG over Pani. The BET result of Pani@ASG shows a mesoporous nature with a pore diameter of less than 3 nm and a surface area of 423.90 m g. Both SEM and TEM analyses show the proportional distribution of ASG over Pani's surface. The adsorption trend of BG and MO on the studied materials at pH 7 was found as follows: Pani@ASG > Pani > ASG. The highest sorption capacities of MO and BG on Pani@ASG were 161.29 and 136.98 mg/g ( = 298.15 K, and Pani@ASG dose: 0.04 g for MO and 0.06 g for BG), which were greater compared with bare Pani and bare ASG, respectively. The interaction mechanism behind the adsorption of BG and MO dyes onto the Pani@ASG nanocomposite includes electrostatic interaction, π-π interaction, and hydrogen bonding. The mechanistic pathway and the interactions between the targeted dyes and Pani@ASG were further studied using adsorption isotherm, adsorption kinetics, and thermodynamics.
本研究介绍了无机-有机杂化纳米复合材料的制备，即三维聚苯胺（Pani）/活性硅胶（ASG）（3D Pani@ASG），对其进行了表征，并研究了其作为阳离子艳绿（BG）、结晶紫（CV）以及阴离子刚果红（CR）和甲基橙（MO）染料潜在吸附剂的去除应用。通过聚合方法制备了Pani@ASG纳米复合材料，并使用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）、带选区电子衍射的透射电子显微镜（TEM）、热重分析及微商热重分析、zeta电位分析和布鲁诺尔-埃米特-泰勒（BET）等多种技术对其进行了表征。扫描电子显微镜（SEM）研究证实Pani@ASG纳米复合材料的平均粒径在5 nm范围内。FESEM、TEM、FTIR和XRD分析证明ASG成功修饰在Pani上。Pani@ASG的BET结果显示其具有介孔性质，孔径小于3 nm，表面积为423.90 m²/g。SEM和TEM分析均表明ASG在Pani表面呈比例分布。发现在pH 7时，BG和MO在所研究材料上的吸附趋势如下：Pani@ASG > Pani > ASG。Pani@ASG对MO和BG的最高吸附容量分别为161.29和136.98 mg/g（T = 298.15 K，Pani@ASG用量：MO为0.04 g，BG为0.06 g），分别高于裸Pani和裸ASG。BG和MO染料吸附到Pani@ASG纳米复合材料上的相互作用机制包括静电相互作用、π-π相互作用和氢键。使用吸附等温线、吸附动力学和热力学进一步研究了目标染料与Pani@ASG之间的作用途径和相互作用。
