Khiari Besma, Wakkel Manel, Abdelmoumen Souhir, Jeguirim Mejdi
National School of Engineers of Carthage, 45 rue des Entrepreneurs, Tunis 1002, Tunisia.
National Institute of Applied Science and Technology (INSAT), University of Carthage, Tunis 1080, Tunisia.
Materials (Basel). 2019 Jan 24;12(3):365. doi: 10.3390/ma12030365.
The present paper aims to develop a low cost, efficient, and environmentally-friendly process to purify (industrial) waters contaminated by copper by the use of oil mill wastes, through kinetic, thermodynamic, and equilibrium investigations. To do so, the raw adsorbent was characterized using different analytical techniques including X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Then, the interaction between copper and olive residues were examined during batch adsorption tests at various operating parameters, such as pH, initial concentration, contact time, and particle size. Kinetic data were best fitted with Broeurs-Sotolongo kinetic model. Additionally, it was found that film and intraparticle diffusion steps controlled simultaneously the mass transfer of copper onto olive mill solid waste. Among the eight tested models, Broeurs-Sotolongo isotherm suited the most the sorption, with regards to the function errors analysis. It was deduced that the adsorption of copper does not involve chemical bonds with high energy which allows easier regeneration steps and higher number of biosorbent regeneration cycles without any need for applying high temperature in the desorption reaction systems. The adsorption capacity (18.93 mg/g) calculated on the basis of this model was close to the experimental value (18.4 mg/g) but more interestingly it brought up that 50% of the generated amounts of olive wastes in Tunisia could eliminate 1.84 kTons of copper from industrial waters.
本文旨在通过动力学、热力学和平衡研究，开发一种低成本、高效且环保的工艺，利用榨油厂废料净化受铜污染的（工业）水。为此，使用包括X射线衍射（XRD）和傅里叶变换红外（FTIR）光谱在内的不同分析技术对原始吸附剂进行了表征。然后，在不同操作参数（如pH值、初始浓度、接触时间和粒径）下的批量吸附试验中，研究了铜与橄榄渣之间的相互作用。动力学数据与布勒尔斯 - 索托隆戈动力学模型拟合效果最佳。此外，发现膜扩散和颗粒内扩散步骤同时控制着铜向橄榄厂固体废物的传质。在八个测试模型中，就功能误差分析而言，布勒尔斯 - 索托隆戈等温线最适合吸附。由此推断，铜的吸附不涉及高能化学键，这使得再生步骤更容易，生物吸附剂再生循环次数更多，且在解吸反应系统中无需施加高温。基于该模型计算的吸附容量（18.93 mg/g）接近实验值（18.4 mg/g），但更有趣的是，它表明突尼斯产生的橄榄废料中有50%可以从工业水中去除1.84吨铜。
