State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, 250353, China; School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China.
Chemosphere. 2021 Sep;279:130504. doi: 10.1016/j.chemosphere.2021.130504. Epub 2021 Apr 8.
Multifunctional composite materials are the key to improving removal capacity and environmental utility. Here, the adsorbent (SLCA) was obtained by free-radical polymerization of acrylic acid with sodium lignosulfonate and citric acid. FTIR, SEM, TGA and XPS characterization methods were used to prove the structure and properties of SLCA adsorbents. The maximum uptake capacities of the optimized SLCA adsorbent is 276 mg g of Cu and 323 mg g of Pb, respectively. The Langmuir isotherm and the second-order kinetic model were established to illustrate that the capture of Cu and Pb by the adsorbent belongs to chemisorption on the monolayer. XPS analysis confirmed that complexation and electrostatic attraction are the mechanism of pollutant removal. Not only that, as-resulting adsorbent revealed no significant adsorption cycle efficiency reduction even after 5 runs of sorption-desorption cycle, manifesting that it is of great stability and could be regarded as a promising candidate adsorbent. The purpose of this research was to develop a green lignin-based adsorbent with strong environmental protection and regeneration ability based on cheap polyacrylic resin.
多功能复合材料是提高去除能力和环境效益的关键。在这里，通过自由基聚合将丙烯酸与木质素磺酸钠和柠檬酸反应，得到吸附剂(SLCA)。采用 FTIR、SEM、TGA 和 XPS 等表征方法证明了 SLCA 吸附剂的结构和性能。优化后的 SLCA 吸附剂对 Cu 的最大吸附容量为 276mg/g，对 Pb 的最大吸附容量为 323mg/g。Langmuir 等温线和二级动力学模型表明，吸附剂对 Cu 和 Pb 的捕获属于单层化学吸附。XPS 分析证实，络合和静电吸引是去除污染物的机理。不仅如此，即使经过 5 次吸附-解吸循环，所得吸附剂的吸附循环效率也没有明显降低，表明其具有很高的稳定性，可以作为一种很有前途的候选吸附剂。本研究旨在开发一种以廉价的聚丙烯酸树脂为基础的、具有较强环保和再生能力的绿色木质素基吸附剂。
