Spectroscopic characterization and photo/thermal resistance of a hybrid palygorskite/methyl red Mayan pigment

被引:41
作者
Giustetto, Roberto [1 ,2 ]
Seenivasan, Kalaivani [2 ,3 ]
Pellerej, Diego [2 ,3 ]
Ricchiardi, Gabriele [2 ,3 ]
Bordiga, Silvia [2 ,3 ]
机构
[1] Univ Turin, Dept Earth Sci, I-10125 Turin, Italy
[2] NIS Ctr Excellence, I-10135 Turin, Italy
[3] Univ Turin, Dept Chem, INSTM Ctr Riferimento, I-10125 Turin, Italy
关键词
Palygorskite; Acid red 2 (methyl red); Maya Blue; Dye encapsulation; Dye stabilization; CRYSTAL-STRUCTURE REFINEMENT; METHYL RED; BLUE PIGMENT; ETHYL RED; AZO DYES; INDIGO; RAMAN; STABILITY; SEPIOLITE; COLOR;
D O I
10.1016/j.micromeso.2012.01.024
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The structural features and host/guest interactions existing in a stable, red-purplish hybrid material obtained by grinding and heating palygorskite clay with 2 wt.% acid red 2 (methyl red) were investigated by means of vibrational and UV-vis spectroscopies in controlled experimental conditions and TGA analyses. Experimental evidences suggest that modified methyl red molecules, in the form of specific zwitterions and/or altered trans-isomers, can diffuse inside the palygorskite tunnels or superficial grooves once zeolitic H2O is removed due to heating or vacuum. The dye is likely to interact with the palygorskite framework by means of several bond types, which include H-bonding to Mg-coordinated OH2 and electrostatic forces, responsible for the compound stability. Sorption in the hosting matrix enhances both the photo- and thermal stability of methyl red and increases steadiness of the palygorskite structure by preventing folding with progressive heating. Such a hybrid material, which shows the same stability and structural features of the famed Maya Blue used in Pre-Columbian America, could therefore be used as an innovative Maya Red pigment. (C) 2012 Elsevier Inc. All rights reserved.
引用
收藏
页码:167 / 176
页数:10
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