Superior adsorption performance of metal-organic-frameworks derived magnetic cobalt-embedded carbon microrods for triphenylmethane dyes

[Co3(BTC)2(H2O)12] microrods synthesized using simple precipitation method at room temperature were used as precursors to prepare Co/C microrods. The as-obtained Co/C microrods showed extremely high selective adsorption capability for TMP dyes due to π-π interaction forces between the sp2 graphitic...

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Published inJournal of colloid and interface science Vol. 536; pp. 483 - 492
Main Authors Ye, Jian, Jin, Lina, Zhao, Xiaoshuang, Qian, Xinye, Dong, Mingdong
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 15.02.2019
Subjects
Adsorption
Carbon composites
Magnetic
Metal-organic frameworks
Triphenylmethane dyes
Carbon composites
Magnetic
Triphenylmethane dyes
Adsorption
Metal-organic frameworks
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Summary:[Co3(BTC)2(H2O)12] microrods synthesized using simple precipitation method at room temperature were used as precursors to prepare Co/C microrods. The as-obtained Co/C microrods showed extremely high selective adsorption capability for TMP dyes due to π-π interaction forces between the sp2 graphitic carbon in Co/C microrods and the triphenyl structure of dyes. [Display omitted] In this work, magnetic Co/C microrods were successfully synthesized using direct carbonization of [Co3(BTC)2(H2O)12] precursors. After the carbonization, the original shape of the precursors was well-maintained, while the magnetic Co nanoparticles were well dispersed in the carbon matrix. The Co/C microrods were used as adsorbents for the adsorption of methyl blue (MB), acid fuchsin (AF), malachite green (MG), rhodamine B (Rh B), methyl orange (MO) and methylene blue (MTB) from their aqueous solutions. The results show that Co/C microrods can selectively adsorb triphenylmethane (TPM) dyes, while the adsorption capacities are about 13960, 11,610 and 4893 mg/g for MB, AF and MG dyes, respectively. The adsorption mechanism can be attributed to π-π interaction forces between the sp2 graphitic carbon in Co/C microrods and the triphenyl structure of dyes. In addition, the synthesized magnetic Co/C microrods can be easily removed from water using magnetic separation, and subsequently, regenerated using ethanol treatment.
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ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2018.10.073