Utilisation of gyrolite with impure Cd²⁺ ions in cement stone

Abstract

This study examined the adsorption capacity of gyrolite for Cd 2 ions in acidic and alkaline solutions and the influence of this compound on the hydration of ordinary Portland cement (OPC). In addition, this paper presents the utilisation scheme of gyrolite with impure Cd 2 ions in the cement stone. It was determined that the Cd(NO 3 ) 2 solution substitution isomorphism is typical of gyrolite because ,33% (in solution at a pH of 5 . 96) and ,22% (in solution at a pH of 8 . 70) of Cd 2 ions participate in the substitution/chemical reaction (gyrolite-Ca 0 Cd 2 $ gyroliteCd 0 Ca 2 ), whereas the rest of these ions are present in gyrolite according to an additional interaction. It was estimated that the addition of adsorbents substituted with Cd 2 ions had no substantial effect on the mineralogical composition of OPC samples. It was also noted that Cd 2 ions were bound in the cement stone under all experimental conditions.

The Adsorption Kinetic Parameters of Co2+ Ions by α-C2SH

“…Calcium silicate hydrates (CSH) play important roles in many areas: in drug delivery, bone tissue engineering, the cement industry, and adsorption for heavy metal ions [12,18,19]. It is known that low basicity calcium silicate hydrates (gyrolite and tobermorite) have good adsorption properties for some metal ions [20,21]. To our knowledge, there is no data on the adsorption properties of dibasic calcium silicate hydrate-α-C 2 SH, which can be easily synthesized from lime and quartz/amorphous silica/silica acid mixtures or from dibasic calcium silicate (C 2 S) polymorphs [22,23].…”

The Adsorption Kinetic Parameters of Co2+ Ions by α-C2SH

“…It is known that low basicity calcium silicate hydrates (gyrolite and tobermorite) have good adsorption properties for some metal ions [20,21]. To our knowledge, there is no data on the adsorption properties of dibasic calcium silicate hydrate-α-C 2 SH, which can be easily synthesized from lime and quartz/amorphous silica/silica acid mixtures or from dibasic calcium silicate (C 2 S) polymorphs [22,23].…”

Gyrolite adsorption of Zn2+ ions in acidic and alkaline solutions

“…In previous works A. Eisinas et al [29,30] examined that gyrolite substituted with Cd 2+ ions can be immobilise in OPC. It was determined that the additive of gyrolite increases both the heat evolution rate and the amount of heat hydration of OPC samples.…”