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Effective Stabilization of Cadmium and Copper in Iron-Rich Laterite-Based Geopolymers and Influence on Physical Properties.
Nkwaju, Rachel Yanou; Nouping, Joëlle Nadia Fekoua; Bachirou, Soumayah; Abo, Tatiane Marina; Deutou, Juvenal Giogetti Nemaleu; Djobo, Jean Noël Yankwa.
Afiliación
  • Nkwaju RY; Local Materials Promotion Authority, MINRESI/MIPROMALO, Nkolbikok, Yaoundé P.O. Box 2396, Cameroon.
  • Nouping JNF; Local Materials Promotion Authority, MINRESI/MIPROMALO, Nkolbikok, Yaoundé P.O. Box 2396, Cameroon.
  • Bachirou S; Local Materials Promotion Authority, MINRESI/MIPROMALO, Nkolbikok, Yaoundé P.O. Box 2396, Cameroon.
  • Abo TM; Local Materials Promotion Authority, MINRESI/MIPROMALO, Nkolbikok, Yaoundé P.O. Box 2396, Cameroon.
  • Deutou JGN; Local Materials Promotion Authority, MINRESI/MIPROMALO, Nkolbikok, Yaoundé P.O. Box 2396, Cameroon.
  • Djobo JNY; Local Materials Promotion Authority, MINRESI/MIPROMALO, Nkolbikok, Yaoundé P.O. Box 2396, Cameroon.
Materials (Basel) ; 16(24)2023 Dec 12.
Article en En | MEDLINE | ID: mdl-38138747
ABSTRACT
This study aimed to investigate the efficiency of a geopolymer binder of the type of Na-poly(ferro-silico-aluminate) as a matrix for the stabilization of heavy metals along with their effect on the development of structural performances. The artificial contamination of soil with ions was carried out and used to prepare an alkali-activated iron-rich lateritic soil binder. Further, various microstructural analyses were carried out to explain the stabilization mechanism. The stabilization efficiency was assessed by leaching tests in de-ionized water and hydrochloric acid (0.1 M, HCl). Then, the physical properties were determined to evaluate the impact of heavy metals on the structural performance of the binder. Results demonstrated that the prepared geopolymer binder has the lowest stabilization capacity in an acidic medium (low pH) than in water with high pH. However, the stabilization of Cu ions was effective at 99%, while the Cd ion is barely retained in the matrix. Firstly, the mechanism consists of chemical bonds through ion exchange with sodium of the Na-poly(ferro-silico-aluminate) network. Secondly, through physical interaction with the pore network of the matrix, the heavy metals induced structural deterioration in the geopolymer matrix with a decrease in the compressive strength and bulk density and an increase of both apparent porosity and water absorption.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Materials (Basel) Año: 2023 Tipo del documento: Article País de afiliación: Camerún Pais de publicación: Suiza

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Materials (Basel) Año: 2023 Tipo del documento: Article País de afiliación: Camerún Pais de publicación: Suiza