中国造纸学报2025，Vol.40Issue(1)：83-92,10.DOI:10.11981/j.issn.1000-6842.2025.01.83
海藻酸钠水凝胶的制备及其对重金属离子吸附性能的研究
Preparation of Sodium Alginate Hydrogels and Its Adsorption Property Towards Heavy Metal Ions
摘要
Abstract
The sodium alginate(SA)hydrogel was successfully prepared by using SA as the substrate and ADH as the cross-linking agent at normal temperature and pressure.The chemical structure,surface morphology,thermal stability and swelling ability of SA hydrogel were characterized through Fourier transform infrared spectroscopy(FT-IR),scanning electron microscope(SEM)thermogravimetry analysis(TG),etc.And the adsorption performance and mechanism of the SA hydrogel towards heavy metal ions(Cu2+,Pb2+and Cr6+)was investigat-ed.The results showed that the SA was crosslinked through the amide bond(—CONH—)to form a hydrogel network,and the SA hydrogel with a"honeycomb"porous surface structure had good thermal stability and high swelling rate.Under the condition of adsorption tempera-ture 25 ℃,initial mass concentration of heavy metal ions 50 mg/L,optimal adsorption pH value of adsorption system(pH=4 for Cu2+and Pb2+,pH=3 for Cr6+),and the adsorption time 480 min,the SA hydrogel had good adsorption performance for Cu2+,Pb2+,and Cr6+,and the equilibrium adsorption capacity was 75.3,129.5,and 26.4 mg/g,respectively.The dynamic and thermodynamic analysis showed that the adsorption process of SA hydrogel for Cu2+,Pb2+and Cr6+conformed to the pseudo second order kinetic model and Freundlich adsorption iso-therm model,which belongs to the multi molecular layer chemical adsorption and was an endothermic process that can be carried out sponta-neously in the forward direction.关键词
海藻酸钠/生物质水凝胶/重金属离子/吸附动力学Key words
sodium alginate/biomass hydrogel/heavy metal ions/adsorption kinetic分类
轻工纺织引用本文复制引用
李玉林,王玉珑,陈方星,林亚辉,杨瑞,匡奕山,张红杰..海藻酸钠水凝胶的制备及其对重金属离子吸附性能的研究[J].中国造纸学报,2025,40(1):83-92,10.基金项目
湖南省自然科学基金(2023JJ30012) （2023JJ30012）
细胞化学湖南省重点实验室开放基金(2021xbhx03) （2021xbhx03）
电力与交通材料保护湖南省重点实验室开放基金. （）
