Abstract This article explored the adsorption of the cationic malachite green (MG) dye and phenol, on hematite iron oxide nanoparticles (α-Fe2O3).The characterization of Fe2O3 was evaluated by specific surface measurements of Brunauer Emmett-Teller (BET) and by Fourier transform infrared spectroscopy (IFTR).The results collected on the kinetics adsorption of malachite green show that the adsorption followed a pseudo-second order kinetics.The percentage of elimination reaches respectively 86.13% and 94% for MG (C=6.10−4mol/L) and phenol (C=5.10−4mol/L).The experimental isotherms were analyzed with Langmuir and Freundlich using nonlinear regression. The results showed respectively that the isotherms of Freundlich and Langmuir best fitted to the equilibrium data for MG and phenol. The thermodynamic study has shown that the adsorption of MG and phenol on α-Fe2O3 is endothermic (ΔH°> 0); it increases with temperature. Negative ΔG° values have shown that the adsorption of MG and phenol on α-Fe2O3is spontaneous. However, the positive values of ΔS° indicate the increase in the disorder of the interface of the α-Fe2O3solution during the fixation of MG and phenol.

中文翻译：

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H合成赤铁矿氧化铁纳米颗粒（α-Fe2O3）对孔雀石绿和苯酚吸附的比较研究

摘要 本文探讨了阳离子孔雀石绿 (MG) 染料和苯酚在赤铁矿氧化铁纳米粒子 (α-Fe2O3) 上的吸附。通过 Brunauer Emmett-Teller (BET) 的比表面测量和傅立叶法对 Fe2O3 的表征进行了评估。变换红外光谱(IFTR)。对孔雀石绿的吸附动力学结果表明，吸附遵循准二级动力学。MG(C=6.10-4mol/L)的去除率分别达到86.13%和94% ) 和苯酚 (C=5.10−4mol/L)。使用 Langmuir 和 Freundlich 使用非线性回归分析实验等温线。结果分别表明，Freundlich 和Langmuir 的等温线最适合MG 和苯酚的平衡数据。热力学研究表明MG和苯酚在α-Fe2O3上的吸附是吸热的(ΔH°>0)；它随温度升高。负的 ΔG° 值表明 MG 和苯酚在 α-Fe2O3 上的吸附是自发的。然而，ΔS°的正值表明在MG和苯酚固定过程中α-Fe2O3溶液界面的无序度增加。