Elimination Study of Anionic Dye by Co-products of the Phosphate Industry: Kinetics and Thermodynamic

M. Mehnaoui, M. Hidouri, Khaled Boughzalaa
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Abstract

Water is essential for all living things however its pain has become serious. Many industrial activities cause pollution by the release of polluting byproducts. Wastewater treatment is hence necessary. In this context, the wastewater of the textile industry containing Red Acid 52 was treated by the solid waste of the washed natural phosphate byproduct. Natural phosphate was also studied. The solid materials were first characterized by chemical analysis, Fourier Transform Infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The phosphate materials were after that, tested in the adsorption of the Red Acid 52. The experimental data indicated that the phosphate waste rock allowed the removal of Red Acid 52. Its maximum retention capacity attained 18.4 mg.g-1. Calcinations of materials inhibit the removal capacity found reduced by 60 to 70%. The adsorption kinetics of the Red Acid 52 on the material is well described by the pseudo-second-order model while the adsorption isotherms are identified by the Langmuir model. Hereafter, the thermodynamic study revealed that the adsorption process is spontaneous and exothermic. The obtained results indicated that the adsorbent has the best adsorption capacity of 18.4 mg.g-1. The removal quantity decreases when the adsorbent is calcined. The kinetics model most appropriate is the pseudo-second-order model. As for the adsorption isotherms, they are well described by the Langmuir model. The temperature effect indicates a decrease in the adsorbed amount with the increase of temperature. Furthermore, the adsorption is spontaneous and exothermic and the reaction is physical in nature for both materials.
磷酸盐工业副产物去除阴离子染料的研究:动力学和热力学
水对所有生物都是必不可少的,然而它的痛苦已经变得严重。许多工业活动因排放污染副产品而造成污染。因此,废水处理是必要的。以含红酸52的纺织工业废水为研究对象,采用天然磷酸盐副产物水洗后的固体废弃物进行处理。对天然磷酸盐也进行了研究。首先用化学分析、傅里叶红外光谱(FTIR)和x射线衍射(XRD)对固体材料进行了表征。然后对磷酸材料进行了红酸52的吸附试验。实验数据表明,磷酸废石可以去除红酸52。其最大保留容量达到18.4 mg.g-1。发现煅烧抑制材料的去除率降低了60 ~ 70%。红酸52在材料上的吸附动力学用拟二阶模型很好地描述,吸附等温线用Langmuir模型确定。随后,热力学研究表明,吸附过程是自发的、放热的。结果表明,该吸附剂的最佳吸附容量为18.4 mg.g-1。吸附剂煅烧后去除率降低。最合适的动力学模型是拟二阶模型。对于吸附等温线,Langmuir模型可以很好地描述。温度效应表明吸附量随温度的升高而降低。此外,两种材料的吸附都是自发的和放热的,反应本质上是物理的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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