聚乙烯亚胺-硫脲-豆蛋白复合材料吸附铅、镉的性能  

Adsorption of Pb2+ and Cd2+ with thiourea-polyethylenimine-soybean protein composite material

作　　者：吴雄志[1] 魏根胜 庞晓霞 胡存杰[1] 金文英[1] 梁俊烨 WU Xiongzhi;WEI Gensheng;PANG Xiaoxia;HU Cunjie;JIN Wenying;LIANG Junye(College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541004)

机构地区：[1]桂林理工大学化学与生物工程学院,桂林541004

出　　处：《分析试验室》2020年第5期560-565,共6页Chinese Journal of Analysis Laboratory

基　　金：广西自然科学基金(2018JJA160010);国家自然科学基金(51262005)项目资助。

摘　　要：以硫脲、聚乙烯亚胺和大豆分离蛋白(SPI)为原料制备了多孔大豆蛋白复合材料(TPS)并进行表征。研究了TPS对Pb2+,Cd2+的微柱分离富集性能。优化实验条件后,TPS对Pb2+,Cd2+可实现定量吸附,吸附容量分别为20. 56和25. 13 mg/g,富集系数分别为200,150倍,经过100次吸附和解吸循环后TPS吸附性能未发生改变,准二级动力学方程适合描述材料对Pb2+,Cd2+的吸附行为。建立了微柱分离富集-石墨炉原子吸收光谱测定Pb2+,Cd2+的新方法,Pb2+,Cd2+的检出限分别为0. 2和0. 06 ng/mL,线性范围分别为0. 02~0. 25μg/mL和0. 001~0. 015μg/mL。该方法成功应用于国标样品、鱿鱼和海水中Pb2+,Cd2+分析。Thiourea-polyethylenimine-soybean protein porous composite material( TPS) was prepared by chemical doping and characterized. TPS was used as packing for micro-column adsorption of Pb2+and Cd2+.Under the optimal conditions,Pb2+and Cd2+could be quantitatively absorbed. The adsorption capacity for Pb2+and Cd2+was 20. 56 and 25. 13 mg/g,and enrichment factor( PF) for Pb2+and Cd2+reached 150 and 200,respectively. Adsorption performance of TPS for Pb2+and Cd2+was not changed after 100 recycles of adsorption/desorption. Pseudo-second-order model was suitable to describe adsorption kinetics of Pb2+and Cd2+. With TPS as adsorbent, a micro-column preconcentration/separation-graphite furnace atomic absorption spectrometry( GFAAS) method for analysis of Pb2+and Cd2+was proposed. The limits of detection( LODs) of Pb2+and Cd2+were 0. 2 and 0. 06 ng/m L,respectively. The linear range for Pb2+and Cd2+were 0. 02-0. 25 μg/m L and0. 001-0. 015 μg/m L,respectively. The method was applied to the analysis of Pb2+and Cd2+in standard reference material,squid and sea water.

关 键 词：大豆蛋白复合材料 铅 镉 吸附 石墨炉原子吸收光谱法(GFAAS) 

分 类 号：TB34[一般工业技术—材料科学与工程]