Abstract
Different crystalline calcium silicate hydrates (CSH) were synthesized under specific hydrothermal conditions and several methods were used to analyze samples. Amorphous calcium silicate hydrates (ACSH) mainly consists of disordered calcium silicate hydrate gel (C-S-H gel) and crystalline calcium silicate hydrates (CCSH) consists of crystallized tobermorite. The adsorption of carcinogenic aflatoxin B1 (AFB1) onto ACSH and CCSH was investigated. The adsorption kinetics was studied using pseudo-first-order and pseudo-second-order kinetic models and intraparticle diffusion model. The pseudo-second-order model provided the best correlation and the intraparticle diffusion controlled the adsorption process of AFB1 onto CCSH. Adsorption isotherm parameters were obtained from Langmuir and Freundlich and the adsorption data fitted to Freundlich much better. Based on the results of N2adsorption/desorption, adsorption kinetics, and adsorption isotherms, the adsorption mechanism of AFB1 onto CCSH was developed. All results indicate that CCSH has a great potential to be a safe, easy-made, and cost-effective material for the control of AFB1 contamination.
Highlights
The synthesis of calcium silicate hydrate (CSH) under the hydrothermal condition has been extensively studied to manufacture some functional materials
The results present in this paper demonstrate the characteristics of CSH and their performance in the adsorption of aflatoxin B1 (AFB1) from aqueous solution
It shows that both amorphous calcium silicate hydrate (ACSH) and calcium silicate hydrate (CCSH) can adsorb AFB1, but CCSH is more effective in the adsorption of AFB1
Summary
The synthesis of calcium silicate hydrate (CSH) under the hydrothermal condition has been extensively studied to manufacture some functional materials. Novel technique for phosphorus recovery from aqueous solutions using ACSH was reported recently [8], and CCSH with a low Ca/Si molar ratio of 0.8–1.0, such as tobermorite [9] and xonotlite [10], has been used for phosphorus recovery. Both of them are beneficial materials for phosphorus recovery and recycling. Heavy metals of Nd(III), Zn(II), Cd(II), Cr(IV), and Sr(II) uptake by CSH have been reported in the literature [11,12,13,14,15]
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