聚氨酯复合物对鲍鱼多糖中重金属离子的吸附-《集美大学学报（自然科学版）》

文章信息/Info

Title:: Polyurethane Composite for the Adsorption of Heavy Metals in Abalone Polysaccharide

Author(s):: YANG Xue; ZHANG Qian; WEI Jie; CHEN Xiaomei; (College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China)

Keywords:: polyurethane; abalone polysaccharide; heavy metal; removal; shell powder

摘要:: 为了脱除鲍鱼多糖中的Hg(II)、Pb(II)、Cd(II)，利用廉价、易得的贝壳粉（oyster shell,OS）功能化聚氨酯泡沫（polyurethane,PU），得到吸附重金属离子的复合材料PU/OS；利用火焰原子吸收光谱法，研究OS添加量、pH值、吸附时间对PU/OS吸附重金属离子的影响，并结合吸附动力学和吸附等温曲线探讨了吸附机理。结果表明，在温度为45 ℃、pH=5.0、平衡时间为180 min的吸附条件下，PU/OS对Hg(II)、Pb(II)、Cd(II)的最大吸附容量分别达到54.62，57.80，82.64 mg/g，吸附遵循准一级动力学模型和Langmuir等温吸附模型，吸附过程为单分子层吸附。利用PU/OS处理鲍鱼多糖后，PU/OS对Hg(II)、Pb(II)、Cd(II)的脱除率分别为59.61%，73.17%，85.71%，对其中的多糖、氨基态氮、蛋白质的保存率分别为83.66%，72.50%，83.21%。结果说明，PU/OS可有效降低鲍鱼多糖中Hg(II)、Pb(II)、Cd(II)的残留量，保障鲍鱼多糖的食用安全性。

Abstract:: Aiming at the removal of Hg(II), Pb(II) and Cd(II) from abalone polysaccharides, a cheap and available shell powder functionalized polyurethane foam (PU/OS) was prepared and applied as an adsorbent for heavy metal ions. The adsorption conditions of PU/OS for heavy metal ions were optimized and the adsorption mechanism was investigated by adsorption kinetics and adsorption isotherm curves. Based on the results, under the conditions of the adsorption temperature of 45 ℃, pH at 5.0 and the adsorption equilibrium time of 180 min, the PU/OS composites is able to adsorb Hg(II), Pb(II) and Cd(II) as much as 54.62, 57.80 and 82.64 mg/g, respectively. The adsorption processing follows the pseudo-first-order kinetic model and Langmuir isotherm adsorption model. Dealing abalone polysaccharide with PU/OS, the removal rate of Hg(II), Pb(II) and Cd(II) was 59.61%, 73.17% and 85.71%; the retention rates of polysaccharides, amino acid nitrogen and protein were 83.66%, 72.50% and 83.21%, respectively. Therefore, PU/OS could significantly reduce the amount of Hg(II), Pb(II), Cd(II), and improve the edible safety of abalone polysaccharide for the consumers.