caa a22 4500 378851284 CHVBK 20180305123324.0 cr unu---uuuuu 161128e20030901xx s 000 0 eng 10.1524/ract.91.9.533.19994 doi (NATIONALLICENCE)gruyter-10.1524/ract.91.9.533.19994 Investigation of sorption of Hg(II) ions onto coconut husk from aqueous solution using radiotracer technique [Elektronische Daten] [Syed Moosa Hasany, Rashid Ahmed, Munawar Hussain Chaudhary] The sorption of Hg(II) ions onto coconut (Cocos nucifera) husk has been studied using radiotracer technique. Maximum sorption (96) of Hg(II) ions (7.39×10-6M) onto sorbent surface is achieved from 10-3M HNO3 solution in 30min agitation time using 100mg of coconut husk. The sorption data follow the Freundlich and Dubinin-Radushkevich (D-R) isotherms. Sorption capacity (6.84 ± 0.45 mmol g-1) and sorption energy (10.6 ± 0.13 kJ mol-1) have been evaluated using these isotherms. Among the ions tested to monitor their influence on the sorption, Ba(II), fluoride and tartarate increased the sorption, while thiosulfate, bromide and thiocyanate reduced (< 63 > 26) the sorption. The cations K(I), Ce(III), Cr(III), Fe(III) and Zr(IV) partially suppressed the sorption. The variation of sorption with temperature yields thermodynamic parameters ΔH = -37.42 kJ mol-1 ΔS = -1057J mol-1K-1 and ΔG = -2.58 ± 0.05 kJ mol-1 at 298 K. The negative values of enthalpy and free energy reflect the spontaneous and exothermic nature of sorption, respectively. The selectivity studies of sorbent show that the coconut husk column can be used to separate Hg(II) ions from Se(IV), Zn(II), I(I) and Tc (VII). The sorbent has a potential in radiochemistry to separate gamma energies of 203Hg (279 keV) from 75Se (265 and 280 keV). © 2003 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Hasany Syed Moosa aut Ahmed Rashid aut Chaudhary Munawar Hussain aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/9/2003(2003-09-01), 533-538 0033-8230 91:9/2003<533 2003 91 ract https://doi.org/10.1524/ract.91.9.533.19994 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.91.9.533.19994 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hasany Syed Moosa aut NATIONALLICENCE 700 1- Ahmed Rashid aut NATIONALLICENCE 700 1- Chaudhary Munawar Hussain aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/9/2003(2003-09-01), 533-538 0033-8230 91:9/2003<533 2003 91 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter