Application of Ba3(PO4)2/Fe3O4 as a novel magnetic adsorbent to remove methyl blue from aqueous solution

Fan Zhang, Xiaoju Yin, Jing Lan, Weihua Zhang

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16 Scopus citations


A novel magnetic composite adsorbent composed of Ba3(PO4)2 nanoflakes and Fe3O4 microsphere (BPF) was prepared. The morphology, chemical structure, and magnetic property of BPF were characterized. Adsorption of methyl blue (MB) onto BPF was investigated with respect to pH, temperature, dosage, adsorption time, and initial MB concentration. Kinetics data and adsorption isotherm were better fitted by pseudo-second-order model and Langmuir equation, respectively. The high adsorption capacity of MB by BPF composite was 334.5 ± 12.5 mg g−1. The values of activation parameters such as free energy (ΔG, −4.25 ± 0.16 mol−1 to −6.06 ± 0.12 kJ mol−1), enthalpy (ΔH, −24.93 ± 1.50 kJ mol−1), and entropy (ΔS, −60.29 ± 3.20 J mol−1 K−1) were determined, indicating that the adsorption was spontaneous, favorable, and exothermic in nature. The removal of MB was attributed to the hydrogen bond and ionic interactions. Moreover, BPF was easily recovered, and the adsorption capacity was approximately 92 % of the initial saturation adsorption capacity after being used five times.

Original languageEnglish (US)
Pages (from-to)3525-3535
Number of pages11
JournalJournal of Materials Science
Issue number7
StatePublished - Apr 1 2016

Bibliographical note

Funding Information:
This work was financially supported by the National Natural Science Funds of China (Grant No. 51402153) and the Fundamental Research Funds for the Central Universities (Grant No. KJQN201553).

Publisher Copyright:
© 2015, Springer Science+Business Media New York.


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