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RISS 인기검색어
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- 저자 : Bolanle Deborah Ikotun (검색결과 2 건)
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Characteristics of Wood Ash Cement Mortar Incorporating Green-Synthesized Nano‑TiO₂
Bolanle Deborah Ikotun,Akeem Ayinde Raheem 한국콘크리트학회 2021 International Journal of Concrete Structures and M Vol.15 No.3
This paper presents the findings of an investigation into the influence of green-synthesized nano-TiO₂ on the characteristics of wood ash (WA) cement mortar. Mortar specimens were prepared by partial replacement of cement with WA (10% by weight) and addition of 1, 2 and 3% nano-TiO₂ by weight of binder; using constant water-to-binder ratio (w/b) for all mixtures. The properties evaluated are setting time of the binder and flexural and compressive strength with water absorption of the mortar. The results indicated that addition of 1 and 2% nano-TiO₂ reduced setting times of WA cement paste. Also, the flexural and compressive strength of WA cement mortar were higher with the incorporation of up to 2% nano-TiO₂. The water absorption of WA cement mortar was reduced when nano-TiO₂ was added with 2% incorporation having the best result. The incorporation of NT in WA cement mortar improved its workability and strength characteristics.
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Thabo Falayi,Bolanle Deborah Ikotun 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.4
Ferrochrome slag (FeCr-GP) and gold mine tailings (GMT-GP) based geopolymers were synthesized and used as adsorbents of heavy metals in aqueous solutions. Batchwise adsorption experiments were used to determine the effect of solid loading (S/L), temperature and time on the adsorption of Cu, Ni and Mn. X-ray diffraction studies showed that GMT-GP was amorphous with calcium aluminium silicate hydrate as the geopolymerization product leading to an increased surface area while GMT-GP had a significant reduction in the intensity of crystalline peaks as compared to the precursor. FeCr-GP could adsorb above 99% of the metal ions (Cu2+, Ni2+ and Mn2+) in solution with an initial metal concentration of 400 ppm at 298, while GMT-GP could only adsorb at least 98% of the metal with an initial metal concentration of 200 ppm. The adsorption was accompanied by a pH rise from 2.3 to 4.5 and 4.8 for GMTGP and FeCr-GP, respectively. The maximum adsorption capacity of FeCr-GP was double that of GMT-GP. FeCr-GP could be desorbed using HCl and reverse osmosis water and could be used for a further three cycles without significant loss in adsorbing ability, while desorption of GMT-GP resulted a reduction in adsorption capability.
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