Hydrogen peroxide triggered morphological evolution of barium sulfate crystals under basic conditions

Inorganic small molecule H sub(2)O sub(2) was utilized as an additive to control the crystallization of BaSO sub(4). The evolution from simple flake-like to pillow morphologies shaped with dominant (hk0) planes and (001) plane was observed by just increasing the pH value and the H sub(2)O sub(2) con...

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Bibliographic Details
Published in:CrystEngComm 2012-01, Vol.14 (16), p.5267-5273
Main Authors: Zhang, Xiao-Hui, Yan, Feng-Wen, Guo, Cun-Yue, Li, Feng-Bo, Huang, Zhi-Jun, Yuan, Guo-Qing
Format: Article
Language:English
Subjects:
Additives
Barite
Crystallization
Decomposition
Elongation
Evolution
Morphology
Planes
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Summary:Inorganic small molecule H sub(2)O sub(2) was utilized as an additive to control the crystallization of BaSO sub(4). The evolution from simple flake-like to pillow morphologies shaped with dominant (hk0) planes and (001) plane was observed by just increasing the pH value and the H sub(2)O sub(2) concentration in the reaction solution. Accompanying the change, the hexagonal (001) plane becomes the main face with the side faces transforming into the (210) and (100) faces. The inhibition on the [001] direction results in the appearance of a (001) face and the faster growth in the [010] direction influences the shape of the (001) plane to be hexagonal, elongated along the [010] direction. The crystalline morphologies of urchin-like BaSO sub(4) at different mineralization times were investigated by SEM and a four-step evolution mechanism was proposed. Selective adsorption of HO sub(2) super(-) originated from the decomposition of H sub(2)O sub(2) over the BaSO sub(4) particles, following gradual O sub(2) evolution, and the formation of BaO sub(2) were considered to be the key factors in the structural evolution. The structural units of urchin-like BaSO sub(4) were strips with hexagonal basal faces, which could be seen as defect-free one-dimensional single crystals. The continuous variation of the morphology captured in this work may provide a deeper understanding of the formation mechanism of one-dimensional barium sulfate fibers. In addition, the results indicate that H sub(2)O sub(2) may act as an additive for the crystallization of minerals. Because the final decomposition products are H sub(2)O and O sub(2), H sub(2)O sub(2) is especially suitable for directing the crystallization demanding high purity of the products.
ISSN:1466-8033
1466-8033
DOI:10.1039/c2ce25538c