Chen Chen, He Enhui, Jiang Xiaohui, Xia Shuwei, Yu Liangmin
School of Chemistry and Chemical Engineering, Jining Normal University, Ulanqab, Inner Mongolia Autonomous Region 012000, 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.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Int J Biol Macromol. 2025 Mar;294:139294. doi: 10.1016/j.ijbiomac.2024.139294. Epub 2025 Jan 1.
Improving the adsorption capacity of materials for pollutants by means of modification is an important direction in the research of water treatment technology. To improve the applicability of sodium alginate composites in the field of adsorption, magnetic sodium alginate-based hydrogel microsphere adsorbent material FeO@SA/PEI-Fe (FSPF) was synthesized in a single step by using polyethyleneimine grafting modification of sodium alginate by sol-gel method. The material was used for the removal of direct blue GL (DB 200) and direct date red B (DR 13) from simulated wastewater, as well as Cu(II) and Pb(II) from simulated wastewater with heavy metal ions. Under the optimum preparation conditions, 0.025 g of FPSF could adsorb 2400 mg/L and 1700 mg/L of DB 200 and DR 13 dyes in 60 min, with removal rates of 92.9 % and 90.8 %, and adsorption quantities of 2229 mg/g and 1539 mg/g, respectively. For 300 mg/L and 400 mg/L pH 5.5 of the For 300 mg/L and 400 mg/L of Cu(II) and Pb(II) ions at pH 5.5, the FPSF reached adsorption equilibrium within 30 min, with removal rates of 95.8 % and 92.3 %, and adsorption quantities of 239 mg/g and 307 mg/g, respectively, which demonstrated highly efficient adsorption performance. In addition, the material has good magnetic responsiveness and can be quickly separated from the water column under an applied magnetic field. The adsorption mechanism follows the Pseudo-second-order kinetic model equation and Langmuir model, which is mainly monolayer adsorption. Thermodynamic analysis showed that the adsorption process for dye molecules was a spontaneous exothermic reaction, while the adsorption process for heavy metal ions was a spontaneous adsorption reaction. Cyclic regeneration experiments showed that after five rounds of adsorption-desorption cycles, the removal efficiencies of the material for the four pollutants in water were still maintained at about 80 % of the initial level.
通过改性提高材料对污染物的吸附能力是水处理技术研究的一个重要方向。为提高海藻酸钠复合材料在吸附领域的适用性，采用溶胶 - 凝胶法对海藻酸钠进行聚乙烯亚胺接枝改性，一步合成了磁性海藻酸钠基水凝胶微球吸附剂材料FeO@SA/PEI-Fe（FSPF）。该材料用于去除模拟废水中的直接蓝GL（DB 200）和直接枣红B（DR 13），以及含重金属离子模拟废水中的Cu(II)和Pb(II)。在最佳制备条件下，0.025 g的FSPF在60分钟内可吸附2400 mg/L和1700 mg/L的DB 200和DR 13染料，去除率分别为92.9%和90.8%，吸附量分别为2229 mg/g和1539 mg/g。对于pH为5.5的300 mg/L和400 mg/L的Cu(II)和Pb(II)离子，FSPF在30分钟内达到吸附平衡，去除率分别为95.8%和92.3%，吸附量分别为239 mg/g和307 mg/g，表现出高效的吸附性能。此外，该材料具有良好的磁响应性，在施加磁场下可快速从水柱中分离。吸附机理符合准二级动力学模型方程和朗缪尔模型，主要为单层吸附。热力学分析表明，染料分子的吸附过程是自发放热反应，而重金属离子的吸附过程是自发吸附反应。循环再生实验表明，经过五轮吸附 - 解吸循环后，该材料对水中四种污染物的去除效率仍保持在初始水平的80%左右。
