Hydration characteristic and leaching behavior of different mixes of slag based -geopolymer cement in presence of heavy metals

Ahmed, Doaa A; H. Abdallah, Sara; Ragai, Shereen M.

doi:10.21608/ejchem.2022.114795.5213

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	Hydration characteristic and leaching behavior of different mixes of slag based -geopolymer cement in presence of heavy metals
Egyptian Journal of Chemistry
Articles in Press, Accepted Manuscript, Available Online from 15 May 2022
Document Type: Original Article
DOI: 10.21608/ejchem.2022.114795.5213
Authors
Doaa A Ahmed ¹; Sara H. Abdallah ²; Shereen M. Ragai²
¹Ain Shams University, Faculty of Women&#039;s, Chemistry Department
²Chemistry Department, Faculty of Women for Arts, Science and Education, Ain Shams University, Cairo, Egypt.
Abstract
Geopolymer binders are now considered to be a necessary condition for replacing Portland cement (OPC) to improve environmental and durability efficiency. Heavy metal contamination has become a very dangerous environmental issue that is becoming increasingly over time. The purpose of this work is to examine the effect of some heavy metals on the hydration characteristic of different mixes of slag-based geopolymer pastes containing some waste materials such as fly ash (FA) and cement kiln dust (CKD), and also, to study the stabilization of heavy metals on the geopolymer matrix to measure the possibility of using this method to remove it. Geopolymer synthesis by 100% slag and partial substitution of slag by 15% FA (85% slag+15%FA) and 5% CKD replacement (95% slag+5% CKD) were investigated. The mixture of liquid sodium silicate (Na2SiO3) and sodium hydroxide (5M NaOH) with a ratio (1:1) is used as an alkaline activator solution. Various percentages of copper ions (Cu2+) or cadmium ions (Cd2+) are added to the alkali-activated mixes. The results indicated that best mix for immobilization of Cu2+ is 100 %slag + 0.5%CuCl2 and for Cd2+ were in case of 100% slag + 0.5%CdCl2 and 95% slag + 5% CKD +0.5%CdCl2. Our study results support the high immobilization of heavy metals in three differently prepared slag-based geopolymer pastes over 28 days and up to 90 days of hydration.
Keywords
Slag; Fly ash; Geopolymer; immobilization; heavy metal


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Hydration characteristic and leaching behavior of different mixes of slag based -geopolymer cement in presence of heavy metals