State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin, China; Engineering Research Center of Food Biotechnology of Chinese Ministry of Education, Tianjin University of Science and Technology, Tianjin, China.
State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin, China; Engineering Research Center of Food Biotechnology of Chinese Ministry of Education, Tianjin University of Science and Technology, Tianjin, China.
J Hazard Mater. 2022 May 15;430:128445. doi: 10.1016/j.jhazmat.2022.128445. Epub 2022 Feb 8.
A novel modified rice husk (MRH) has been prepared for removing cationic dyes in both single system and binary system. SEM-EDS, FT-IR, XRD and XPS were used to characterize the physical and chemical properties of MRH. It showed that the maximum adsorption capacity of MRH for methyl violet (MV) and malachite green (MG) in single system was 154.49 and 996.97 mg g, while in binary system was 530.94 and 408.58 mg g, respectively. The experimental results showed that the pseudo-second-order kinetic model was better to describe the kinetic behavior of MV and MG adsorption. By using double layer adsorption model, we found that the n for MV adsorption were 2.52, 2.65 and 3.34 at 298, 308 and 318 K, respectively, and the n for MG adsorption were 4.59, 4.85 and 4.30, respectively. These results illustrated that multiple dye molecules were adsorbed on one adsorption site in non-parallel direction, indicating that the adsorption of dyes is multi-molecular mechanism. Furthermore, synergistic and antagonistic adsorption might be existed simultaneously in binary system. In summary, MRH has been shown well adsorption properties and reusability and our finding might provide a new idea for developing low-cost, efficient and reusable adsorbent to remove dyes from wastewater.
一种新型改性稻壳（MRH）已被制备用于在单体系和双体系中去除阳离子染料。SEM-EDS、FT-IR、XRD 和 XPS 用于表征 MRH 的物理和化学性质。结果表明，MRH 对单体系中甲基紫（MV）和孔雀石绿（MG）的最大吸附容量分别为 154.49 和 996.97 mg/g，而在双体系中分别为 530.94 和 408.58 mg/g。实验结果表明，准二级动力学模型更能描述 MV 和 MG 吸附的动力学行为。通过使用双层吸附模型，我们发现 MV 吸附的 n 值分别为 2.52、2.65 和 3.34，在 298、308 和 318 K 下，而 MG 吸附的 n 值分别为 4.59、4.85 和 4.30。这些结果表明，多个染料分子在非平行方向上被吸附在一个吸附位上，表明染料的吸附是多分子机制。此外，在双体系中可能同时存在协同和拮抗吸附。总之，MRH 表现出良好的吸附性能和可重复使用性，我们的发现可能为开发低成本、高效和可重复使用的吸附剂以去除废水中的染料提供了新的思路。
