Porous metakaolin geopolymer as a reactive binder for hydroxyapatite adsorbent granules in dye removal

Brahmi, Aghilas; Ziani, Salima; AitAli, Salima; Benkhaoula, Bachir Nadir; Yu, Yangmei; Ahouari, Hania; Khireddine, Hafit; Luukkonen, Tero

doi:10.1016/j.hybadv.2023.100134

Cited by 9 publications

(1 citation statement)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The absorption peak at 1420 cm Figure 9 shows the N 2 adsorption-desorption curves and pore size distributions of the microspheres. The RGGMs showed a type IV curve (H3 hysteresis loop), indicating the existence of predominantly mesoporous structures in the microspheres [46]. The BJH desorption test showed that the average pore size of the RGGMs was 21.99 nm.…”

Section: Mineral Composition Analysis Of Rggmsmentioning

confidence: 98%

Synthesis of BiOX-Red Mud/Granulated Blast Furnace Slag Geopolymer Microspheres for Photocatalytic Degradation of Formaldehyde

Lu,

Zhang,

Wang

et al. 2024

Materials

View full text Add to dashboard Cite

Release of formaldehyde gas indoors is a serious threat to human health. The traditional adsorption method is not stable enough for formaldehyde removal. Photocatalytic degradation of formaldehyde is effective and rapid, but photocatalysts are generally expensive and not easy to recycle. In this paper, geopolymer microspheres were applied as matrix materials for photocatalysts loading to degrade formaldehyde. Geopolymer microspheres were prepared from red mud and granulated blast furnace slag as raw materials by alkali activation. When the red mud doping was 50%, the concentration of NaOH solution was 6 mol/L, and the additive amount was 30 mL, the prepared geopolymer microspheres possessed good morphological characteristics and a large specific surface area of 38.80 m2/g. With the loading of BiOX (X = Cl, Br, I) photocatalysts on the surface of geopolymer microspheres, 85.71% of formaldehyde gas were adsorbed within 60 min. The formaldehyde degradation rate of the geopolymer microspheres loaded with BiOI reached 87.46% within 180 min, which was 23.07% higher than that of the microspheres loaded with BiOBr, and 50.50% higher than that of the microspheres loaded with BiOCl. While ensuring the efficient degradation of formaldehyde, the BiOX (X = Cl, Br, I)-loaded geopolymer microspheres are easy to recycle and can save space. This work not only promotes the resource utilization of red mud and granulated blast furnace slag, but also provides a new idea on the formation of catalysts in the process of photocatalytic degradation of formaldehyde.

show abstract

Section: Mineral Composition Analysis Of Rggmsmentioning

confidence: 98%