caa a22 4500 378878360 CHVBK 20180305123425.0 cr unu---uuuuu 161128e20031201xx s 000 0 eng 10.1524/ract.91.12.721.23417 doi (NATIONALLICENCE)gruyter-10.1524/ract.91.12.721.23417 Sorption of Np(V) by synthetic hydroxyapatite [Elektronische Daten] [Robert C. Moore, Kathleen Holt, Hongting Zhao, Ahmed Hasan, Nasser Awwad, Mona Gasser, Charles Sanchez] The sorption of Np(V) to synthetic hydroxyapatite was determined in batch experiments in a 0.1M NaClO4 solution. The hydroxyapatite used was of high purity as determined by SEM, EDS, XRD, FT-IR and ICP-MS analysis. Results from kinetic experiments with an initial Np(V) concentration of 1×10-7 to 1×10-6M indicate the sorption process is relatively fast with more than 90 of the Np(V) being sorbed in approximately 3 hours. Equilibrium experiments performed over the pH range of 6 to 11 indicated sorption is strongly pH dependent with distribution coefficients, Kd values (mL/g), increasing from 123L/mole at pH 6 to 69200L/mole at pH 8.5. Kd values are observed to decrease as pH further increases. Data points over a range of Np(V) concentrations were collected at pH 8 and fitted to the Langmuir isotherm model for simple adsorption. The Langmuir equation gave an excellent representation of the data. Langmuir parameters were determined to be Ca=0.032mole/mole and K=1.22×106L/mole, indicating the high affinity of hydroxyapatite for Np(V) adsorption. © 2003 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Moore Robert C. aut Holt Kathleen aut Zhao Hongting aut Hasan Ahmed aut Awwad Nasser aut Gasser Mona aut Sanchez Charles aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/12/2003(2003-12-01), 721-728 0033-8230 91:12/2003<721 2003 91 ract https://doi.org/10.1524/ract.91.12.721.23417 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.91.12.721.23417 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Moore Robert C. aut NATIONALLICENCE 700 1- Holt Kathleen aut NATIONALLICENCE 700 1- Zhao Hongting aut NATIONALLICENCE 700 1- Hasan Ahmed aut NATIONALLICENCE 700 1- Awwad Nasser aut NATIONALLICENCE 700 1- Gasser Mona aut NATIONALLICENCE 700 1- Sanchez Charles aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/12/2003(2003-12-01), 721-728 0033-8230 91:12/2003<721 2003 91 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter