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Separation and preconcentration of Pb(II) and Cd(II) from aqueous samples using hyperbranched polyethyleneimine-functionalized graphene oxide-immobilized polystyrene spherical adsorbents
Microchemical Journal ( IF 4.8 ) Pub Date : 2019-03-01 , DOI: 10.1016/j.microc.2018.11.032
Hilal Ahmad , Chaojie Cai , Changkun Liu

Abstract Accurate determination of metal ions in wastewater is essential for environmental monitoring and assessment. In aqueous media, the presence of metal ions at trace concentrations and the interference of matrices pose difficulty in its quantification. Hence, a radical way to eliminate the matrix components is to preconcentrate the target metal ions. Graphene oxide, due to their exceptional higher surface area, has received significant attention and research interest in the field of adsorption science. However, direct use of graphene oxide in preconcentration of metal ions faces irreversible aggregation and leakage from column. To overcome these challenges, we synthesized a polyethylenimine-functionalized graphene oxide-immobilized polystyrene adsorbent and employed for the column preconcentration of Pb(II) and Cd(II) from wastewater samples. The optimum pH for Pb(II) and Cd(II) preconcentration were found to be 6 and 8, respectively. The method showed a preconcentration factor of 833 and 900 and a detection limit of 1.5 ± 0.2 ng L−1 and 1.8 ± 0.3 ng L−1 for Pb(II) and Cd(II), respectively. The preconcentration limit for Pb(II) and Cd(II) were found to be 0.80 μg L−1 and 0.74 μg L−1, respectively. The PS@GOA adsorbent can be used repeatedly up to 72 cycles without any loss of the extraction efficiency. The prepared adsorbent is chemically stable, showing no leaching of graphene oxide from the column. The accuracy of the method against the systematic and constant errors was resolute by analyzing SRM 1572 and NIES 10C (

中文翻译:

使用超支化聚乙烯亚胺官能化氧化石墨烯固定聚苯乙烯球形吸附剂从水性样品中分离和预浓缩 Pb(II) 和 Cd(II)

摘要 准确测定废水中的金属离子对于环境监测和评估至关重要。在水性介质中,存在痕量浓度的金属离子和基质的干扰对其定量造成困难。因此,消除基质成分的一种根本方法是预浓缩目标金属离子。氧化石墨烯由于其特殊的高表面积,在吸附科学领域受到了极大的关注和研究兴趣。然而,直接使用氧化石墨烯预浓缩金属离子面临着不可逆的聚集和色谱柱泄漏。为了克服这些挑战,我们合成了一种聚乙烯亚胺功能化氧化石墨烯固定化聚苯乙烯吸附剂,并用于废水样品中 Pb(II) 和 Cd(II) 的柱预浓缩。发现 Pb(II) 和 Cd(II) 预浓缩的最佳 pH 值分别为 6 和 8。该方法的预浓缩因子分别为 833 和 900,Pb(II) 和 Cd(II) 的检测限分别为 1.5 ± 0.2 ng L-1 和 1.8 ± 0.3 ng L-1。发现 Pb(II) 和 Cd(II) 的预浓缩极限分别为 0.80 μg L-1 和 0.74 μg L-1。PS@GOA 吸附剂可重复使用多达 72 次循环,而不会降低提取效率。制备的吸附剂化学性质稳定,不会从色谱柱中浸出氧化石墨烯。通过分析 SRM 1572 和 NIES 10C ( 该方法的预浓缩因子分别为 833 和 900,Pb(II) 和 Cd(II) 的检测限分别为 1.5 ± 0.2 ng L-1 和 1.8 ± 0.3 ng L-1。发现 Pb(II) 和 Cd(II) 的预浓缩极限分别为 0.80 μg L-1 和 0.74 μg L-1。PS@GOA 吸附剂可重复使用多达 72 次循环,而不会降低提取效率。制备的吸附剂化学性质稳定,不会从色谱柱中浸出氧化石墨烯。通过分析 SRM 1572 和 NIES 10C ( 该方法的预浓缩因子分别为 833 和 900,Pb(II) 和 Cd(II) 的检测限分别为 1.5 ± 0.2 ng L-1 和 1.8 ± 0.3 ng L-1。发现 Pb(II) 和 Cd(II) 的预浓缩极限分别为 0.80 μg L-1 和 0.74 μg L-1。PS@GOA 吸附剂可重复使用多达 72 次循环,而不会降低提取效率。制备的吸附剂化学性质稳定,不会从色谱柱中浸出氧化石墨烯。通过分析 SRM 1572 和 NIES 10C ( PS@GOA 吸附剂可重复使用多达 72 次循环,而不会降低提取效率。制备的吸附剂化学性质稳定,不会从色谱柱中浸出氧化石墨烯。通过分析 SRM 1572 和 NIES 10C ( PS@GOA 吸附剂可重复使用多达 72 次循环,而不会降低提取效率。制备的吸附剂化学性质稳定,不会从色谱柱中浸出氧化石墨烯。通过分析 SRM 1572 和 NIES 10C (
更新日期:2019-03-01
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