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submitted on 27.02.2020 and posted on 28.02.2020by Lifeng Chen, Jie Zhang, Xianwen He, Manqing Liu, Qiuyang Wei, Xinpeng Wang, Yuezhou Wei
Themeasurement of 210Pb is
significant in environmental studies. Lead separation in HCl solution is a
vital procedure but suffers from poor efficiency with high labor and time
costs. To overcome this problem, a novel anion exchange resin was synthesized
and characterized by different techniques followed by studies on the adsorption
behaviors towards lead in HCl solution. The results suggest that SiPS-N(CH3)3Cl
was successfully prepared with small particle size, low water swelling rate,
and large specific surface area. The maximum anion exchange capacity resulted
from quaternary amine groups was determined to be 1.0 mmol (Cl-)/g.The
adsorption activities reached equilibrium within 3 min under selected
conditions offering extremely fast adsorption kinetics. The synergistic
adsorption mechanism, the multilayer adsorption mechanism, and the competition
from co-existing chloride anions were found to be responsible for the lead
adsorption performance of SiPS-N(CH3)3Cl. Column experiments
showed that the feeding volume of lead and HCl had impact on the chemical yield
regardless of the co-existence of high concentrations of FeCl3 (90
mM) and a high flow speed (4.0 mL/min). Based on these results, a separation
process integrating SiPS-N(CH3)3Cl and the matched
parameters was finally developed and tested. Our work greatly raised the lead
separation efficiency in HCl solutions with implications for measuring 210Pb
in environmental samples.