title: Selective removal of cesium by ammonium molybdophosphate - polyacrylonitrile bead and membrane.
abstract: The selective removal of radionuclides with extremely low concentrations from environmental medium remains a big challenge. Ammonium molybdophosphate possess considerable selectivity towards cesium ion (Cs+) due to the specific ion exchange between Cs+and NH4+. Ammonium molybdophosphate - polyacrylonitrile (AMP-PAN) membrane was successfully prepared for the first time in this study. Efficient removal of Cs+(95.7%, 94.1% and 91.3% of 1mgL-1) from solutions with high ionic strength (400mgL-1of Na+, Ca2+or K+) was achieved by AMP-PAN composite. Multilayer chemical adsorption process was testified through kinetic and isotherm studies. The estimated maximum adsorption capacities even reached 138.9±21.3mgg-1. Specifically, the liquid film diffusion was identified as the rate-limiting step throughout the removal process. Finally, AMP-PAN membrane could eliminate Cs+from water effectively through the filtration adsorption process.
authors.affiliation: College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China; Graduate School of Life and Environmental Science, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: ddh@njau.edu.cn.
authors.forename: Dahu
authors.initials: D
authors.lastname: Ding
authors.affiliation: Graduate School of Life and Environmental Science, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: Zhenya
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100044, China.
authors.forename: Rongzhi
authors.initials: R
authors.lastname: Chen
authors.affiliation: College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China. Electronic address: ctm@njau.edu.cn.
authors.forename: Tianming
authors.initials: T
authors.lastname: Cai
keywords: Desorption; Kinetic; Liquid film diffusion; Moving boundary model; Radioactive contamination