Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266100, China; Key Laboratory of Ocean Observation and Information of Hainan Province, Sanya Oceanographic Institution, Ocean University of China, Sanya 572024, China.
Int J Biol Macromol. 2024 Oct;277(Pt 4):134516. doi: 10.1016/j.ijbiomac.2024.134516. Epub 2024 Aug 5.
Biomass-based adsorbent materials are characterized by their low cost, environmental friendliness, and ease of design and operation. In this study, biomass-based hydrogel microspheres erbium alginate (SA/Er) with high stability and adsorption properties were prepared by a one-step synthesis method. The prepared materials were characterized and analyzed by SEM-EDS, XRD, TGA, FT-IR, UV-Vis, BET-BJH and XPS, and the adsorption performance of SA/Er was investigated for high concentrations of azo dyes in water. The results showed that the adsorption performance of SA/Er on the azo dyes of direct violet N (DV 1) and direct dark green NB (DG 6) with concentrations of 850 mg/L and 1100 mg/L under the optimal conditions was very high, and the adsorption amount could be up to 692 mg/g and 864 mg/g, respectively. The adsorption process was in accordance with the quasi-secondary kinetic model, which was accomplished by physical and chemical adsorption; the Langmuir isothermal model was able to better respond to the adsorption equilibrium, and the adsorption was dominated by the adsorption of surface monolayers; after seven desorption cycles, the removal of both azo dyes by the adsorbent material could reach >79.7 %. Combined with the results of FT-IR, UV-vis and XPS analysis before and after the adsorption, it was revealed that the adsorption of SA/Er with the dye molecules mainly consisted of hydrogen bonding, electrostatic adsorption and surface complexation, which resulted in the significant adsorption effect on the two azo dyes, and the above results can provide a reference for the treatment of dye wastewater.
生物质基吸附材料具有成本低、环境友好、设计和操作简便等特点。本研究通过一步合成法制备了具有高稳定性和吸附性能的生物质基水凝胶微球海藻酸钠（SA/Er）。采用 SEM-EDS、XRD、TGA、FT-IR、UV-Vis、BET-BJH 和 XPS 对制备的材料进行了表征和分析，并研究了 SA/Er 对水中高浓度偶氮染料的吸附性能。结果表明，在最佳条件下，SA/Er 对浓度为 850mg/L 和 1100mg/L 的直接紫 N（DV 1）和直接深绿 NB（DG 6）偶氮染料的吸附性能非常高，吸附量分别可达 692mg/g 和 864mg/g。吸附过程符合准二级动力学模型，通过物理和化学吸附完成；Langmuir 等温模型能够更好地响应吸附平衡，吸附主要由表面单分子层的吸附主导；经过 7 次脱附循环，吸附剂对两种偶氮染料的去除率均可达到>79.7%。结合吸附前后 FT-IR、UV-vis 和 XPS 分析的结果，表明 SA/Er 与染料分子的吸附主要通过氢键、静电吸附和表面络合作用进行，从而对两种偶氮染料产生了显著的吸附效果。上述结果可为染料废水处理提供参考。
