Abstract
This study proposes a green, low‐cost, and robust method to synthesize spherical calcium hydroxide (CH) nanoparticles based on the co‐precipitation of Ca2+ and OH− in the presence of tannic acid (TA), an inexpensive plant‐derived polyphenol. It has been found that the morphology and crystalline phase of the produced CH nanoparticles can be controlled by TA. With the increasing dosage of TA, the crystallinity of the CH particles reduces, changing from well crystallization to amorphous phases. Experimental evidence suggests that complexion reaction took place between TA and Ca2+, which gave the Ca2+ a strong bond effect. As a result, the nucleation and growth of CH were significantly affected. CH nanoparticles with sizes of about 50 nm have been successfully synthesized by using 0.3% or more TA.
Highlights
Calcium hydroxide (CH) nanoparticle has gained extensive attentions as an eco-friendly material [1, 2] with numerous applications in the natural stone, wood, and cultural heritage conservation [2,3,4,5,6], wall painting [7, 8], and consolidation of art works [9], as well as the treatment of catalyst and adsorbents [10, 11]
We found that tannic acid (TA), an inexpensive plant-derived polyphenol, can be used as an effective surfactant to stabilize and facilitate the production of CH nanoparticles through a co-precipitation process at ambient temperature and pressure
In addition to that the residual peaks are hardly detected in TA3 and completely disappear in TA5. is suggests that the existence of TA interfered the crystallization of CH, resulting CH with poor crystallinity when more TA has been added, especially amorphous CH when 0.5% TA was used
Summary
Calcium hydroxide (CH) nanoparticle has gained extensive attentions as an eco-friendly material [1, 2] with numerous applications in the natural stone, wood, and cultural heritage conservation [2,3,4,5,6], wall painting [7, 8], and consolidation of art works [9], as well as the treatment of catalyst and adsorbents [10, 11]. We found that tannic acid (TA), an inexpensive plant-derived polyphenol, can be used as an effective surfactant to stabilize and facilitate the production of CH nanoparticles through a co-precipitation process at ambient temperature and pressure. Erefore, this paper was conducted to investigate the effect of TA on the morphology and crystal form of CH nanoparticles in a co-precipitation process using CaCl2 and NaOH.
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