Key Laboratory of Eco-Textile, Ministry of Education, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu 214122, China.
Key Laboratory of Eco-Textile, Ministry of Education, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu 214122, China.
Int J Biol Macromol. 2022 Sep 1;216:860-870. doi: 10.1016/j.ijbiomac.2022.07.215. Epub 2022 Jul 30.
The reduction and sequestration of toxic Cr(VI) via a one-step process in an aqueous solution is critical to eliminate its environmental risk. In this study, amine functionalized cellulose-based aerogel beads (CGP) was developed for simultaneous and efficient adsorption- reduction- sequestration of Cr(VI). CGP showed a maximum Cr(VI) adsorption capacity of 386.40 mg/g at 25 °C due to its strong electrostatic attraction towards Cr(VI). The simultaneous Cr(VI) adsorption- reduction- sequestration performance of CGP over a wide Cr(VI) concentration range was examined. The mechanism was investigated in-depth via the analysis of adsorption kinetics, XPS spectra, and FTIR spectra. Moreover, the Cr immobilization stability of CGP after adsorption was evaluated in simulated neutral, acidic, and alkaline conditions. The effect of pH, temperature, ionic strength and the presence of interfering ions on CGP adsorption performance were investigated by batch adsorption experiments. Fixed-bed column adsorption study was performed to explore the application potential of CGP beads in a wastewater treatment process.
在水溶液中通过一步法还原和固定有毒的 Cr(VI)对于消除其环境风险至关重要。在这项研究中，制备了胺功能化纤维素基气凝胶珠（CGP），用于同时高效吸附-还原-固定 Cr(VI)。由于对 Cr(VI)的强静电吸引力，CGP 在 25°C 时表现出最大的 Cr(VI)吸附容量为 386.40mg/g。考察了 CGP 在宽 Cr(VI)浓度范围内同时进行 Cr(VI)吸附-还原-固定的性能。通过吸附动力学分析、XPS 光谱和 FTIR 光谱深入研究了其机制。此外，还评估了 CGP 在吸附后对 Cr 的固定稳定性在模拟中性、酸性和碱性条件下。通过批量吸附实验研究了 pH、温度、离子强度和共存离子对 CGP 吸附性能的影响。进行了固定床柱吸附研究，以探索 CGP 珠在废水处理过程中的应用潜力。
