School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
Int J Biol Macromol. 2021 Apr 1;175:459-472. doi: 10.1016/j.ijbiomac.2021.02.018. Epub 2021 Feb 4.
As an emerging pollutant treatment material, hydrogel is known for its good adsorption capacity and environmental friendliness. In this study, a composite material of acrylic acid as the polymerization monomer grafted sodium lignosulfonate and guar gum was prepared, which provided a channel for adsorbing metal ions with its abundant active functional groups and porous structure. The optimized synthesized product was applied to the removal of Cu and Co in a one-component system and a multi-component system, and the maximum ion adsorption capacities obtained were determined to be 709 mg g of Cu, 601 mg g of Co, respectively. The adsorption kinetics and isotherms were well fitted by the pseudo second-order kinetic model and the Langmuir isotherm, showing that the adsorption of Cu and Co by the adsorbent belongs to the chemisorption on monolayer. XPS results confirmed the successful adsorption of Cu and Co by GG/SLS. Surface complexation was proposed to be the main mechanism for GG/SLS adsorbent to remove heavy metal ions. In addition, the use of recycling research showed that the adsorbent has good chemical stability. These results provided valuable information for designing highly efficient adsorbents that can be used as a high-quality wastewater treatment material.
作为一种新兴的污染物处理材料，水凝胶以其良好的吸附能力和环境友好性而闻名。本研究以丙烯酸为聚合单体，接枝木质素磺酸钠和瓜尔胶，制备了一种复合材料，其丰富的活性官能团和多孔结构为吸附金属离子提供了通道。优化合成的产物被应用于单一体系和多组分体系中 Cu 和 Co 的去除，得到的最大离子吸附容量分别为 709mg/g 的 Cu 和 601mg/g 的 Co。吸附动力学和等温线很好地符合拟二级动力学模型和 Langmuir 等温线，表明吸附剂对 Cu 和 Co 的吸附属于单层化学吸附。XPS 结果证实了 GG/SLS 对 Cu 和 Co 的成功吸附。提出表面络合是 GG/SLS 吸附剂去除重金属离子的主要机理。此外，对回收利用的研究表明，该吸附剂具有良好的化学稳定性。这些结果为设计高效吸附剂提供了有价值的信息，可将其用作优质的废水处理材料。
