Design and synthesis of La.sup.3+-, Sb.sup.3+-doped MOF-In.sub.2S.sub.3@FcDc-TAPT COFs hybrid materials with enhanced photocatalytic activity

Based on the synthesis of 2,4,6-tris(4-aminophenyl)-1,3,5-triazine (TAPT) and ferrocene-1,1'-dicarbaldehyde (FcDc), a variety of novel La.sup.3+-, Sb.sup.3+-doped MOF-In.sub.2S.sub.3@FcDc-TAPT COFs hybrid materials were designed and synthesized with NH.sub.2-MIL-68(In) as matrix. A dense claddi...

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Bibliographic Details
Published in:	Journal of materials science 2019-12, Vol.54 (24), p.14690
Main Authors:	He, Ren, Xue, Kehui, Wang, Jing, Yang, Tianli, Sun, Renrui, Wang, Lin, Yu, Xianglin
Format:	Article
Language:	eng
Subjects:	Building materials Metallocenes
Online Access:	Get full text
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Summary:	Based on the synthesis of 2,4,6-tris(4-aminophenyl)-1,3,5-triazine (TAPT) and ferrocene-1,1'-dicarbaldehyde (FcDc), a variety of novel La.sup.3+-, Sb.sup.3+-doped MOF-In.sub.2S.sub.3@FcDc-TAPT COFs hybrid materials were designed and synthesized with NH.sub.2-MIL-68(In) as matrix. A dense cladding layer has formed on the surface of the MOF-In.sub.2S.sub.3 heterostructure through coating FcDc-TAPT COFs. The detection of C-N bonds confirmed that the hybrid materials were covalently bonded with the ferrocene-1,1'-dicarbaldehyde (FcDc)-modified covalent triazine-based frameworks (FcDc-TAPT). Then, the photocatalytic reduction of Cr(VI) in aqueous phase under visible light was implemented with the hybrid materials as photocatalysts. Doping La.sup.3+ or Sb.sup.3+ has obviously improved the photocatalytic degradation efficiency of Cr(VI). In particular, Sb.sup.3+-doped MOF-In.sub.2S.sub.3@FcDc-TAPT COFs had the best removal of Cr(VI) with removal rate of 99% within 20 min. By fitting the experimental data with the pseudo-first-order equation, the speed constants were obtained. The kinetics constant of Sb.sup.3+-doped MOF-In.sub.2S.sub.3@FcDc-TAPT COFs for Cr(VI) degradation was 0.4307 min.sup.-1, which was more than 19.87 times as much as that of the non-doped MOF-In.sub.2S.sub.3@FcDc-TAPT COFs hybrid materials. The DRS and PL results verified that the introduction of La.sup.3+ or Sb.sup.3+ into the hybrid materials could effectively inhibit the photogenic electron and promote the separation of electron-hole pairs. The cyclic and stability results displayed that the removal rate of Cr(VI) by Sb.sup.3+-doped MOF-In.sub.2S.sub.3@FcDc-TAPT COFs after five times of repeated use was still 95.39%; in particular, it was not significantly changed even after 150 d. It confirmed that the Sb.sup.3+-doped MOF-In.sub.2S.sub.3@FcDc-TAPT COFs was a very stable catalyst, due to the carbonyl and Cp ring conjugate of FcDc, which could produce delocalized electrons and stabilize the ions or free radicals.
ISSN:	0022-2461 1573-4803