Thermal decomposition and recovery properties of ZnAl-CO3 layered double hydroxide for anionic dye adsorption: insight into the aggregative nucleation and growth mechanism of the LDH memory effect

被引:109
作者
Santos, R. M. M. [1 ]
Tronto, J. [2 ]
Briois, V. [3 ]
Santilli, C. V. [1 ]
机构
[1] Univ Estadual Paulista UNESP, Inst Quim, Rua Prof Francisco Degni 55, BR-14800060 Araraquara, SP, Brazil
[2] Univ Fed Vicosa, Inst Ciencias Exatas & Tecnol, Campus Rio Paranaiba,Rodovia BR 354,Km 310, BR-38810000 Rio Paranaiba, MG, Brazil
[3] CNRS, Synchrotron SOLEIL, UR1, BP48, F-91192 Gif Sur Yvette, France
基金
巴西圣保罗研究基金会;
关键词
HYDROTALCITE-LIKE COMPOUNDS; X-RAY-ABSORPTION; MULTIVARIATE CURVE RESOLUTION; WASTE-WATER; AZO-DYE; DECOLORIZATION; RECONSTRUCTION; NANOPARTICLES; SPECTROSCOPY; REMOVAL;
D O I
10.1039/c7ta00834a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The thermal decomposition of carbonate-intercalated layered double hydroxide (ZnAl-CO3-LDH) and recovery induced by water and dye solution addition were studied in situ by time-resolved wide angle Xray scattering (WAXS) and time-resolved X-ray absorption spectroscopy (XAS), providing insights into the mechanisms of these structural transformations. LDH nanostructure recovery was driven by an aggregative nucleation and growth mechanism, which is limited by the steric hindrance caused by the adsorption of the Acid Blue 113 azo dye (AB) on the external surface of both the nanocrystalline tactoids and the exfoliated layers. The recovery behaviour in dye solution is consistent with the hypothesis of the LDH-recovery by a direct synthesis process, generating nanosized LDH particles with thickness about four times lower than those induced by water addition. These findings explain the higher AB adsorption capacity (1587 mg g(-1)) of calcined LDH, compared to pristine ZnAl-CO3-LDH (261.8 mg g(-1)) and also the efficient recycling of the spent adsorbent.
引用
收藏
页码:9998 / 10009
页数:12
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