TY - JOUR
T1 - XANES evidence of molybdenum adsorption onto novel fabricated nano-magnetic CuFe2O4
AU - Tu, Yao Jen
AU - You, Chen Feng
AU - Chang, Chien Kuei
AU - Chan, Ting Shan
AU - Li, Sheng Hsien
N1 - Funding Information:
This research is financially supported by MOE and NCKU to CFY. The authors would like to thank Prof. Jiang Wei-Teh and Mr. Lee Po-Shu for their support on XRD analysis under the project of NSC1002116M006002. We also thank NSRRC staff for useful discussions and experimental support.
PY - 2014/5/15
Y1 - 2014/5/15
N2 - An efficient Molybdenum (Mo) removal technology in aqueous solutions was developed for the first time using nano-magnetic CuFe2O4 manufactured from printed circuit board (PCB) industrial sludge. This nano-magnetic CuFe2O4 adsorbent displayed a nonlinear L-type isotherm that fitted well with the Langmuir isotherm, suggested limited adsorption sites and monolayer sorption on surface. The K-edge X-ray absorption near-edge structure (XANES) spectra demonstrated that Mo(VI) was the predominant oxidation species on nano-magnetic CuFe2O4 and the maximum adsorption capacity was found to be 30.58mgg-1 at pH 2.75. When pH became higher, more negative charges would occur at the surface of adsorbent and lead to more electric repulsion. Consequently, Mo adsorption was sharply reduced in alkaline condition. Importantly, these adsorbed Mo anions were replaced easily by OH- ions in NaOH solution and showed huge potential for removal/concentration of Mo in industrial wastewater, groundwater, and tap water. This unique Mo separation technique can also be potentially applied for geochemical investigation in various natural aqueous solutions.
AB - An efficient Molybdenum (Mo) removal technology in aqueous solutions was developed for the first time using nano-magnetic CuFe2O4 manufactured from printed circuit board (PCB) industrial sludge. This nano-magnetic CuFe2O4 adsorbent displayed a nonlinear L-type isotherm that fitted well with the Langmuir isotherm, suggested limited adsorption sites and monolayer sorption on surface. The K-edge X-ray absorption near-edge structure (XANES) spectra demonstrated that Mo(VI) was the predominant oxidation species on nano-magnetic CuFe2O4 and the maximum adsorption capacity was found to be 30.58mgg-1 at pH 2.75. When pH became higher, more negative charges would occur at the surface of adsorbent and lead to more electric repulsion. Consequently, Mo adsorption was sharply reduced in alkaline condition. Importantly, these adsorbed Mo anions were replaced easily by OH- ions in NaOH solution and showed huge potential for removal/concentration of Mo in industrial wastewater, groundwater, and tap water. This unique Mo separation technique can also be potentially applied for geochemical investigation in various natural aqueous solutions.
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U2 - 10.1016/j.cej.2014.01.084
DO - 10.1016/j.cej.2014.01.084
M3 - Article
AN - SCOPUS:84894037339
VL - 244
SP - 343
EP - 349
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -