TY - JOUR
T1 - Application of magnetic nano-particles for phosphorus removal/recovery in aqueous solution
AU - Tu, Yao Jen
AU - You, Chen Feng
AU - Chang, Chien Kuei
AU - Chen, Mei Hsuan
N1 - Funding Information:
This research is financially supported by MOE (Taiwan) and NCKU (Taiwan) to CFY. The authors would like to thank Prof. Wei-Teh Jiang, Mr. Po-Shu Lee, and Mr. Yi-Liang Wang, for their support on XRD analysis under the project of NSC: 102-2119-M-006, Taiwan.
Publisher Copyright:
© 2014 Taiwan Institute of Chemical Engineers.
PY - 2015/1/1
Y1 - 2015/1/1
N2 - To remove or recover phosphorus (P) efficiently from various aqueous solutions is important as P is an essential nutrient and a key element to cause eutrophication. This study examines the feasibility of P removal/recovery using Fe3O4 nano-particles, generated from ferrite process. A rapid increased of P adsorption (0.17 to 2.38mg/g) was detected when the solution pH decreased from 11.09 to 2.77. A maxima adsorption capacity was estimated to be 3.65mg/g P at 318K and pH 2.77, much higher than other iron-based adsorbents. Additionally, P adsorption increases with the increase of ionic strength from 0.001 to 1.0N, indicating that the inner-sphere mechanism was importantly involved in the P adsorption. This P adsorption is spontaneous and endothermic, supported by the negative changed standard free energy with temperatures (δGo=-4.33, -4.56, -4.80, -5.02kJ/mol at 288, 298, 308, and 318K, respectively) and the positive δHo values (0.28kJ/mol). The positive δSo (2.79J/molK) further indicates that the randomness increased at solid-solution interface during P adsorption. These results reveal potential applications of Fe3O4 nano-particles for P removal/recovery in wastewaters or freshwaters.
AB - To remove or recover phosphorus (P) efficiently from various aqueous solutions is important as P is an essential nutrient and a key element to cause eutrophication. This study examines the feasibility of P removal/recovery using Fe3O4 nano-particles, generated from ferrite process. A rapid increased of P adsorption (0.17 to 2.38mg/g) was detected when the solution pH decreased from 11.09 to 2.77. A maxima adsorption capacity was estimated to be 3.65mg/g P at 318K and pH 2.77, much higher than other iron-based adsorbents. Additionally, P adsorption increases with the increase of ionic strength from 0.001 to 1.0N, indicating that the inner-sphere mechanism was importantly involved in the P adsorption. This P adsorption is spontaneous and endothermic, supported by the negative changed standard free energy with temperatures (δGo=-4.33, -4.56, -4.80, -5.02kJ/mol at 288, 298, 308, and 318K, respectively) and the positive δHo values (0.28kJ/mol). The positive δSo (2.79J/molK) further indicates that the randomness increased at solid-solution interface during P adsorption. These results reveal potential applications of Fe3O4 nano-particles for P removal/recovery in wastewaters or freshwaters.
UR - https://www.scopus.com/pages/publications/84920460985
UR - https://www.scopus.com/pages/publications/84920460985#tab=citedBy
U2 - 10.1016/j.jtice.2014.09.016
DO - 10.1016/j.jtice.2014.09.016
M3 - Article
AN - SCOPUS:84920460985
SN - 1876-1070
VL - 46
SP - 148
EP - 154
JO - Journal of the Taiwan Institute of Chemical Engineers
JF - Journal of the Taiwan Institute of Chemical Engineers
ER -