Zbair Mohamed, Anfar Zakaria, Ahsaine Hassan Ait
Laboratory of Catalysis and Corrosion of Materials, Chouaïb Doukkali University, Faculty of Sciences El Jadida BP. 20 El Jadida 24000 Morocco
Materials and Environment Laboratory, Ibn Zohr University, Faculty of Sciences Agadir Morocco.
RSC Adv. 2019 Feb 15;9(10):5756-5769. doi: 10.1039/c9ra00079h. eCollection 2019 Feb 11.
In this work, bentonite clay (BC) calcined at 500 °C was used as an adsorbent (BC-500) for the adsorption of Pb and -nitrophenol. The ability of BC-500 for the removal of Pb and -nitrophenol has been investigated. The adsorption studies tailored well the pseudo-first-order and the Langmuir model for Pb and -nitrophenol both. In addition, the optimal removal of Pb and -nitrophenol was found at pH 5 for Pb and pH 6 for -nitrophenol. However, the change of temperature (20-60 °C) was found to have a negative effect on the adsorption process on BC-500. Based on the Dubinin-Radushkevich model the adsorption occurs a physical process. Accordingly, the adsorption mechanism was proposed using N-physisorption analysis before and after adsorption of Pb and -nitrophenol. The reusability of BC-500 was examined and the outcomes recommended that BC-500 had good potential as an economic and proficient adsorbent for Pb or -nitrophenol from contaminated water. Finally, the experimental Pb and -nitrophenol removal efficiency were found to be 90.93 ± 2.15% and 98.06 ± 1.87% while the predicted value by model equals 91.28 ± 1.68 and 97.24 ± 2.54, respectively, showing that the predicted model values are in good agreement with the experimental value.
在本研究中，将500℃煅烧的膨润土（BC）用作吸附剂（BC-500）来吸附铅和对硝基苯酚。研究了BC-500去除铅和对硝基苯酚的能力。吸附研究很好地拟合了铅和对硝基苯酚的准一级动力学模型和朗缪尔模型。此外，发现去除铅的最佳pH值为5，去除对硝基苯酚的最佳pH值为6。然而，发现温度变化（20 - 60℃）对BC-500上的吸附过程有负面影响。基于杜宾宁-拉杜舍维奇模型，吸附是一个物理过程。因此，在吸附铅和对硝基苯酚前后，通过N-物理吸附分析提出了吸附机理。考察了BC-500的可重复使用性，结果表明BC-500作为一种经济高效的吸附剂，具有从污染水中去除铅或对硝基苯酚的良好潜力。最后，实验测得铅和对硝基苯酚的去除效率分别为90.93±2.15%和98.06±1.87%，而模型预测值分别为91.28±1.68和97.24±2.54，表明预测模型值与实验值吻合良好。
