TY - JOUR
T1 - Arsenate adsorption from water using a novel fabricated copper ferrite
AU - Tu, Yao Jen
AU - You, Chen Feng
AU - Chang, Chien Kuei
AU - Wang, Shan Li
AU - Chan, Ting Shan
N1 - Funding Information:
The authors would like to thank the Environmental Protection Administration (EPA) for the financial support (Contract Number: EPA-99-GA103-03-A236-18). We thank Prof. Jiang Wei-Teh and Mr. Lee Po-Shu for their support on XRD analysis under the project of NSC 1002116M006002. We also thank NSRRC staff for useful discussions and experimental support.
PY - 2012/8/1
Y1 - 2012/8/1
N2 - A novel fabricated copper ferrite was investigated for its As(V) removal in this study. The adsorption of As(V) by this recycled copper ferrite exhibited an L-shaped nonlinear isotherm, suggesting limited binding sites on the adsorbent surface. The As K-edge XANES indicated that the adsorbed As(V) on copper ferrite was not reduced to more toxic As(III) by Fe2+ in the structure. The maximum As adsorption capacity of the copper ferrite was 45.66mgg-1 at pH 3.7 and decreased with pH due to enhanced electrostatic repulsion between As(V) and the adsorbent surface. Desorption of As(V) using six different acid and salt solutions revealed that the desorption rate decreased in the order of H3PO4>Na3PO4>H2SO4>Na2SO4>HCl>HNO3. These results suggest that the recycled copper ferrite without surface modification is an effective adsorbent for removing As(V) from water, confirmed by effective removal of As(V) from contaminated groundwater. Furthermore, the novel fabricated copper ferrite can be used to recover rapidly in 20s using a magnet. The information obtained in this work shows great potential for developing a cost-effective adsorbent for immobilization of arsenate using the recycled copper ferrite.
AB - A novel fabricated copper ferrite was investigated for its As(V) removal in this study. The adsorption of As(V) by this recycled copper ferrite exhibited an L-shaped nonlinear isotherm, suggesting limited binding sites on the adsorbent surface. The As K-edge XANES indicated that the adsorbed As(V) on copper ferrite was not reduced to more toxic As(III) by Fe2+ in the structure. The maximum As adsorption capacity of the copper ferrite was 45.66mgg-1 at pH 3.7 and decreased with pH due to enhanced electrostatic repulsion between As(V) and the adsorbent surface. Desorption of As(V) using six different acid and salt solutions revealed that the desorption rate decreased in the order of H3PO4>Na3PO4>H2SO4>Na2SO4>HCl>HNO3. These results suggest that the recycled copper ferrite without surface modification is an effective adsorbent for removing As(V) from water, confirmed by effective removal of As(V) from contaminated groundwater. Furthermore, the novel fabricated copper ferrite can be used to recover rapidly in 20s using a magnet. The information obtained in this work shows great potential for developing a cost-effective adsorbent for immobilization of arsenate using the recycled copper ferrite.
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U2 - 10.1016/j.cej.2012.06.006
DO - 10.1016/j.cej.2012.06.006
M3 - Article
AN - SCOPUS:84864322486
SN - 1385-8947
VL - 198-199
SP - 440
EP - 448
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -