School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China.
J Hazard Mater. 2019 May 5;369:50-61. doi: 10.1016/j.jhazmat.2019.02.021. Epub 2019 Feb 10.
The magnetic lignin-based adsorbent (FeO/C-ACLS) has been successfully prepared and applied to adsorbing azo dyes Congo red, Titan yellow and Eriochrome blue black R. The samples were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), X-ray powder diffraction (XRD), vibration sample magnetometer (VSM), Raman spectroscopy and elemental analysis. In the process of adsorption, five kinds of influencing factors and recycling regeneration were discussed, and the adsorption mechanisms such as kinetics, isotherm, thermodynamics were explored. The results show that FeO/C-ACLS can remove 98%, 92% and 99% of Congo red, Titan yellow and Eriochrome blue black R, respectively. Under the same conditions, the removal rate was 87%, 84% and 88% after 5 times adsorption cycle, respectively. Pseudo-first-order, pseudo-second-order kinetics, Elovich model and intraparticle diffusion model were studied, and the results show that the adsorption process conforms to pseudo-second-order kinetics model, and the diffusion rate is controlled by many steps. The results of isotherm model and thermodynamics show that the adsorption process is consistent with Langmuir model and is mainly a spontaneous chemical endothermic process of monolayer.
磁性木质素基吸附剂（FeO/C-ACLS）已成功制备并应用于吸附偶氮染料刚果红、钛黄和埃利奥克罗姆蓝黑 R。通过傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、热重分析（TGA）、X 射线粉末衍射（XRD）、振动样品磁强计（VSM）、拉曼光谱和元素分析对样品进行了表征。在吸附过程中，讨论了五种影响因素和回收再生，探讨了动力学、等温线、热力学等吸附机制。结果表明，FeO/C-ACLS 可分别去除 98%、92%和 99%的刚果红、钛黄和埃利奥克罗姆蓝黑 R。在相同条件下，经过 5 次吸附循环后，去除率分别为 87%、84%和 88%。研究了伪一级、伪二级动力学、埃洛维奇模型和颗粒内扩散模型，结果表明吸附过程符合伪二级动力学模型，扩散速率受多个步骤控制。等温线模型和热力学结果表明，吸附过程与朗缪尔模型一致，主要是单层自发的化学吸热过程。
