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Application of FeMgMn layered double hydroxides for phosphate anions adsorptive removal from water
Abstract The development and application of new materials for phosphate removal are very important due to its increasing emissions from the activities of daily living and socially production which may lead to eutrophication. The FeMgMn layered double hydroxides (FeMgMn-LDH) have been synthesized via a co-precipitation method and their adsorption characteristics for phosphate were investigated in this study. Adsorption equilibrium could be fitted by the Dubinin-Kaganer-Radushkevich (DKR) and Langmuir models. FeMg2Mn-LDH has the largest phosphate removal capacity and the fastest adsorption kinetics among the three LDH with different Fe/Mg/Mn ratio. The maximum adsorption capacity of FeMg2Mn-LDH at 25 °C is 34.31 mg-P/g. The negative values of ΔG0 and the positive value of ΔH0 (6.725 kJ/mol) indicate that the phosphate adsorption process on FeMgMn-LDH is spontaneous and endothermic. The competition order of coexisting anions on phosphate adsorption with FeMgMn-LDH is CO3 2− > SO4 2− > NO3 −. An ion exchange mechanism can be attested by the apparent adsorption energy (E) values and the change of Cl content. Moreover, the appearance of small particles on the SEM images of Phosphate-FeMgMn-LDH, and the results of FTIR and XPS spectra demonstrated that the formation of both outer- and inner-sphere surface complexes via electrostatic attraction and monodentate/bidentate complexations. Overall, the as-prepared FeMgMn-LDH is a promising adsorbent for dephosphorization.
Graphical abstract Display Omitted
Highlights FeMgMn-LDH has been synthesized via a co-precipitation method. FeMgMn-LDH is a promising adsorbent for dephosphorization. The main adsorption mechanisms of PO4 3-by FeMgMn-LDH are ion exchange, electrostatic attraction and surface complexation.
Application of FeMgMn layered double hydroxides for phosphate anions adsorptive removal from water
Abstract The development and application of new materials for phosphate removal are very important due to its increasing emissions from the activities of daily living and socially production which may lead to eutrophication. The FeMgMn layered double hydroxides (FeMgMn-LDH) have been synthesized via a co-precipitation method and their adsorption characteristics for phosphate were investigated in this study. Adsorption equilibrium could be fitted by the Dubinin-Kaganer-Radushkevich (DKR) and Langmuir models. FeMg2Mn-LDH has the largest phosphate removal capacity and the fastest adsorption kinetics among the three LDH with different Fe/Mg/Mn ratio. The maximum adsorption capacity of FeMg2Mn-LDH at 25 °C is 34.31 mg-P/g. The negative values of ΔG0 and the positive value of ΔH0 (6.725 kJ/mol) indicate that the phosphate adsorption process on FeMgMn-LDH is spontaneous and endothermic. The competition order of coexisting anions on phosphate adsorption with FeMgMn-LDH is CO3 2− > SO4 2− > NO3 −. An ion exchange mechanism can be attested by the apparent adsorption energy (E) values and the change of Cl content. Moreover, the appearance of small particles on the SEM images of Phosphate-FeMgMn-LDH, and the results of FTIR and XPS spectra demonstrated that the formation of both outer- and inner-sphere surface complexes via electrostatic attraction and monodentate/bidentate complexations. Overall, the as-prepared FeMgMn-LDH is a promising adsorbent for dephosphorization.
Graphical abstract Display Omitted
Highlights FeMgMn-LDH has been synthesized via a co-precipitation method. FeMgMn-LDH is a promising adsorbent for dephosphorization. The main adsorption mechanisms of PO4 3-by FeMgMn-LDH are ion exchange, electrostatic attraction and surface complexation.
Application of FeMgMn layered double hydroxides for phosphate anions adsorptive removal from water
Zhou, Hongguang (author) / Tan, Youlin (author) / Yang, Yanmei (author) / Zhang, Yue (author) / Lei, Xiaoyu (author) / Yuan, Donghai (author)
Applied Clay Science ; 200
2020-10-19
Article (Journal)
Electronic Resource
English
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