Naeem A, Mustafa S, Rehana N, Dilara B, Murtaza S
National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan.
Environ Technol. 2003 Jun;24(6):779-85. doi: 10.1080/09593330309385614.
Aluminium(III) phosphate was observed to have a very high selectivity towards Pb2+ ions. Under similar conditions, the sorption capacities of the exchanger were observed to follow the order: Pb2+ > Zn2+ > Ni2+ > Co2+. The potentiometric titration data were used to determine the deprotonation constants (pKa) of AlPO4, which were dependent upon the temperature and nature of the metal cations present in the aqueous phase. Different physical methods i.e. FTIR, EPM and the wet chemical analyses were used to investigate the uptake mechanism of Pb2+ by the solid, which showed that no new solid phases were present in the solid residue after sorption of Pb2+ at pH 5. The exchange between protons from the surfaceand Pb2+ from solutions was found to be responsible for Pb2+ sorption by aluminum(III) phosphate.
观察到磷酸铝（III）对Pb2+离子具有非常高的选择性。在相似条件下，观察到该离子交换剂的吸附容量遵循以下顺序：Pb2+>Zn2+>Ni2+>Co2+。电位滴定数据用于确定AlPO4的去质子化常数（pKa），其取决于水相中存在的金属阳离子的温度和性质。采用不同的物理方法，即傅里叶变换红外光谱（FTIR）、电子探针微分析（EPM）和湿化学分析，研究了固体对Pb2+的吸附机制，结果表明，在pH为5吸附Pb2+后，固体残渣中不存在新的固相。发现表面质子与溶液中Pb2+之间的交换是磷酸铝（III）吸附Pb2+的原因。
