Enhancement of sorption of the azoic dye (Azucryl Red) by natural and calcined hyper-aluminous kaolins

Q3 Engineering

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu Pub Date : 2024-02-29 DOI:10.33271/nvngu/2024-1/105

A. Sekhri, L. Mahtout, A. Bouzidi, N. Bouzidi, M. Ferfar

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引用次数: 0

Abstract

Purpose. To remove of basic textile dye Azucryl Red (AR) from aqueous solutions using hyper-aluminous kaolins from Charente deposits (France) in natural and calcined states. Methodology. Batch interactive parameter pH, pHpzc contact time, dye concentration, adsorbent loading and temperature are taken to obtain optimums for the AR adsorption process in natural and calcined kaolin named respectively Kca, Kcm, Ckca, and Ckcm. Findings. The adsorption equilibrium was established in 7 min while the second-order kinetic model better described the adsorption kinetics for all kaolins with the chemisorption process. The adsorption isotherm of the results obtained corresponds better to the Langmuir model. The maximum quantity retained was 67.97 and 73.38 mg/g respectively for Kcm and Kca samples. Moreover, in the calcined state, the maximum quantity retained was 76.66 and 75.64 mg/g respectively for the calcined kaolin CKcm and CKca samples for a temperature of 298 K and pH = 6. The thermodynamic nature of the adsorption process was determined by calculating H, S and G° values. The positive value of H° confirms the fact that adsorption is endothermic spontaneous which is enhanced at higher temperatures. Originality. The heat treatments of the different kaolins at 400 °C enhance the adsorption process. Therefore, the results indicate that Ckcm performed with the highest adsorption capacity in the removal of the dye, followed by Ckca. Practical value. Adsorption processes of toxic Azucryl Red dye in the aqueous medium using natural and calcined hyper-aluminous kaolins at 400 °C were investigated. Optimization and modeling of the adsorption parameters with the theories by Langmuir, Freundlich and Elovich allowed us to find the optimal experimental conditions for sorption. Our results therefore indicate that the adsorption process of Azucryl red dye from aqueous solutions was enhanced when calcined kaolin at 400 °C containing organic matters was used.

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天然高岭土和煅烧高铝高岭土对偶氮染料（天青红）的吸附增强作用

目的使用来自法国夏朗德矿床的天然和煅烧状态的高铝高岭土，去除水溶液中的碱性纺织染料天青红（AR）。方法。采用批量交互参数 pH 值、pHpzc 接触时间、染料浓度、吸附剂负载量和温度，以获得天然高岭土和煅烧高岭土对 AR 吸附过程的最佳值，分别命名为 Kca、Kcm、Ckca 和 Ckcm。研究结果吸附平衡在 7 分钟内建立，而二阶动力学模型更好地描述了所有高岭土的吸附动力学和化学吸附过程。所得结果的吸附等温线与 Langmuir 模型更为吻合。Kcm 和 Kca 样品的最大吸附量分别为 67.97 和 73.38 毫克/克。此外，在煅烧状态下，温度为 298 K、pH = 6 时，煅烧高岭土 CKcm 和 CKca 样品的最大吸附量分别为 76.66 和 75.64 mg/g。通过计算 H、S 和 G° 值，确定了吸附过程的热力学性质。H° 的正值证实了吸附是自发的内热现象，在温度较高时吸附作用增强。原创性。不同高岭土在 400 °C 下的热处理会增强吸附过程。因此，结果表明 Ckcm 在去除染料方面的吸附能力最强，其次是 Ckca。实用价值。研究了天然高岭土和煅烧高铝高岭土在 400 ℃ 下对水介质中有毒胭脂红染料的吸附过程。根据 Langmuir、Freundlich 和 Elovich 的理论对吸附参数进行了优化和建模，从而找到了最佳的吸附实验条件。因此，我们的结果表明，当使用含有有机物的 400 °C 煅烧高岭土时，水溶液中 Azucryl 红色染料的吸附过程得到了增强。

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来源期刊

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu Engineering-Engineering (all)

CiteScore

1.70

自引率

0.00%

发文量

148