Abstract

Kinetic study of adsorption and removal capability towards coexistent acidic and basic dyes in the polluted waste water using poly-o-toluidine-zirconium phosphoborate nanocomposite has been done. Poly-o-toluidine-zirconium phosphoborate nanocomposite synthesized by controlled sol-gel process were characterized using X-ray diffraction, scanning electron microscope, transmission electron microscope, and Fourier transform infrared spectrometer, respectively. Adsorption study confirmed that the composite with 15 wt % of poly-o-toluidine has been found to possess maximum adsorption capacity (89.9 mg/g) for crystal violet as compared to pristine zirconium phosphoborate (15.1 mg/g). It has been shown that the increased adsorption capacity of the composite related to its high surface to volume ration as well high porosity. Moreover, the optimization of reaction conditions and parameters like pH (pH 11 for methylene blue/crystal violet/neutral red and pH 3 for eriochrome black T/light green), adsorbent dosage (25 mg per 100 mL), and time interval (3.5 hours) significantly affect the maximum adsorption percentage of the composite. The physicochemical interactions between the composite surface and the dye molecules mechanistically support the higher values of adsorption. The adsorption trend of dyes follows the pseudo-second order kinetics. The adsorption data fit well into adsorption isotherm models of Langmuir and Freundlich.

中文翻译：

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使用PTD-ZrPB纳米复合材料去除和回收废水中有害的酸性和碱性染料的动力学研究和等温线分析

摘要

使用聚邻甲苯胺-磷酸硼酸锆纳米复合材料对污染废水中共存的酸性和碱性染料的吸附和去除能力进行了动力学研究。聚Ó通过控制溶胶-凝胶法合成的甲苯胺-锆phosphoborate纳米复合材料使用，其特征X射线衍射，扫描电子显微镜，透射电子显微镜，和分别傅立叶变换红外光谱仪。吸附研究证实，具有15 wt％的聚邻苯二甲酸酯的复合材料与原始的磷酸硼锆锆（15.1 mg / g）相比，已发现甲苯胺对结晶紫具有最大的吸附容量（89.9 mg / g）。已经表明，复合物的增加的吸附能力与其高的表面体积比以及高的孔隙率有关。此外，优化了反应条件和参数，例如pH（亚甲基蓝/结晶紫/中性红的pH 11，以及铬黑T /浅绿色的pH 3），吸附剂剂量（每100 mL 25 mg）和时间间隔（3.5）小时）显着影响复合材料的最大吸附百分比。复合材料表面和染料分子之间的物理化学相互作用以机械方式支持较高的吸附值。染料的吸附趋势遵循拟二级动力学。