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In our work, analcime has a crystallite size of 90.54 nm was synthesised using the hydrothermal method in the presence of urea as organic structure-directing agent. Then, Mn(II) ions were removed from aqueous media using the synthesised analcime sample. Some analytical parameters affecting the removal of Mn(II) ions were studied such as contact time, pH, concentration, and temperature. The results of the effect of contact time confirmed that the pseudo-second-order kinetic model was the best for describing the adsorption process. Also, the equilibrium time and optimum pH were 60 min and 6.5, respectively. Besides, the results of the effect of concentration confirmed that the Langmuir isotherm was the best for describing the adsorption process where the maximum adsorption capacity was 81.169 mg/g. Moreover, the results of the effect of temperature confirmed that the removal of Mn(II) ions was exothermic. [ABSTRACT FROM AUTHOR]

In this paper, rice husk and waste aluminum cans were exploited as silicon and aluminum sources, respectively for the low-cost synthesis of some nanosized zeolite, zeolite/zeolite, and geopolymer/zeolite products. XRD confirmed that the synthesized geopolymer/zeolite products are geopolymer/zeolite A (has a crystallite size of 58.44 nm & abbreviated as G1) and geopolymer/faujasite (has a crystallite size of 25.58 and 20.26 nm & abbreviated as G2 and G3, respectively). Also, the synthesized zeolite products are sodium aluminum silicate hydrate (has a crystallite size of 27.65 and 41.85 nm & abbreviated as H1 and H2, respectively). Besides, the synthesized zeolite/zeolite product is sodium aluminum silicate hydrate/zeolite A (has a crystallite size of 66.01 nm and abbreviated as H3). Moreover, the synthesized products were characterized using other tools such as HR-TEM, FE-SEM, EDX, and FT-IR. The synthesized products were efficiently applied for removing Co(II), Cu(II), and Zn(II) ions from aqueous media and wastewater which was taken from Abuzaabal- Qalyubiyah-Egypt. The maximum uptake capacity of G3 sample toward Co(II), Cu(II), and Zn(II) ions is 134.24 ± 1.26, 126.26 ± 0.32, and 131.93 ± 0.87 mg/g, respectively. The uptake of the studied metal ions is spontaneous, chemical, exothermic, and fitted well with the Langmuir isotherm and pseudo-2nd-order kinetic model., (Copyright © 2020 Elsevier B.V. All rights reserved.)

In this study, Fe 2 O 3 (hematite) nanoparticles with different crystallite sizes (40-59 nm) were synthesized from Egyptian insecticide cans using the combustion method. The organic fuels were urea, glycine, L-alanine, and L-valine. Fe 2 O 3 nanoparticles were characterized utilizing different devices such as BET, PL, FT-IR, XRD, HR-TEM, FE-SEM, UV-Vis, and DTG. Crystal violet (CV) and methylene blue (MB) dyes were efficiently removed from aqueous solution by photocatalytic degradation under UV irradiation in the presence of Fe 2 O 3 and H 2 O 2 . The % degradation of 50 mL crystal violet or methylene blue dye (20 mg/L) using 0.1 g Fe 2 O 3 in the presence of H 2 O 2 was 100% after 30 or 40 min, respectively. Also, the degradation processes are fitted well with the first order model. Besides, the photocatalytic activity of Fe 2 O 3 unaltered even after it was reused three times. Hence, the synthesized Fe 2 O 3 nanoparticles can be considered a promising and efficient photocatalyst for the degradation of crystal violet and methylene blue dyes., (Copyright © 2019 Elsevier B.V. All rights reserved.)