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Open AccessArticle

Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

by 1,2, 1,2, 3 and 1,2,*
1
University of Science and Technology (UST) Korea, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
2
Department of Land, Water, and Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT), Gyeonggi-do, Goyang-si 10223, Korea
3
Chemistry Control Division C-2, Pakistan Atomic Energy Commission (PAEC), Islamabad 1114, Pakistan
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(22), 4897; https://doi.org/10.3390/app9224897
Received: 30 September 2019 / Revised: 1 November 2019 / Accepted: 4 November 2019 / Published: 15 November 2019
(This article belongs to the Special Issue The Adsorption of Emerging Contaminants in an Aqueous Environment Ⅱ)
Iron was incorporated into an LTA type zeolite using the sol-gel hydrothermal method to form Iron-zeolite-A (Iron-Z-A), and its phosphate adsorption-desorption efficiency were analyzed. Samples were characterized by EDS, SEM, XRD, EPR, FT-IR XPS, and Raman to ensure the apt synthesis of Iron-Z-A and to interpret the mechanism of adsorption-desorption of PO43− in an aqueous solution. EPR and XPS analysis confirmed that the iron was doped as Fe3+ in the LTA structure. The XPS peak shift (Fe-2p), FT-IR band shift, and intensity change (–OH) confirmed the existence of the ligand exchange mechanism. In the adsorption phase at pH 5, the derivative of phosphate (H2PO4) acts as a ligand and interacts with OH of Fe on the zeolite surface to form “Iron-zeolite (oxy) hydroxide bound phosphate”. In the desorption phase at pH 10, phosphate ligand is detached and get mixed in the aqueous phase as HPO42−. The EDS data, Si–O–Al band shift and intensity change in FT-IR and XPS peak intensity change proved the contribution of Al in the process of adsorption. The data of adsorption fitted well with the Langmuir’s isotherm and pseudo-second-order kinetic model. The amount of PO43− adsorbed was a function of adsorbent’s surface area regardless of concentration. The amount of PO43− being adsorbed by the metal ions was found to be 382.296 mg PO43−/g Fe and 56.296 mg PO43−/g Al. View Full-Text
Keywords: Iron; zeolite-A; phosphate; adsorption-desorption; mechanism; kinetics Iron; zeolite-A; phosphate; adsorption-desorption; mechanism; kinetics
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MDPI and ACS Style

Saifuddin, M.; Kim, S.; Aziz, A.; Kim, K.S. Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach. Appl. Sci. 2019, 9, 4897. https://doi.org/10.3390/app9224897

AMA Style

Saifuddin M, Kim S, Aziz A, Kim KS. Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach. Applied Sciences. 2019; 9(22):4897. https://doi.org/10.3390/app9224897

Chicago/Turabian Style

Saifuddin, Md; Kim, Suho; Aziz, Abdul; Kim, Kwang S. 2019. "Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach" Appl. Sci. 9, no. 22: 4897. https://doi.org/10.3390/app9224897

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