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 Preparation, characterization, and application of nano‐silica from agricultural wastes in cement mortar
Tác giả hoặc Nhóm tác giả: Ali D. S., Tatjána J., Phuoc‐Cuong Le*, Moayyed G.J., Thamer A.A., Endre D., Hoang‐Son Le, S.W.Chang, ,S.C.Kim, D. D. Nguyen
Nơi đăng: Biomass Conversion and Biorefinery (Q2, IF 4.05); Số: online first (14 Feb. 2023);Từ->đến trang: 1-11;Năm: 2023
Lĩnh vực: Môi trường; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
This work aimed to prepare and characterize nano-silica (SiO2) from agricultural waste (palm ash) through a leaching treat- ment process using citric acid (C6H8O7). These waste materials (if present in large quantities) could lead to environmental issues, since palm waste materials are burned in a furnace at 700 °C for 5 h. The produced palm ash (PA) was treated with different concentrations of citric acid solution (1–5%). Subsequently, the PA was crushed for 1 h in a ball-milling machine to minimize particle size and enhance reactivity for the leaching process. The pure extracted silica balls were then milled for 2 h. The results showed that silica could be extracted from PA using citric acid leaching treatment under the optimum extrac- tion conditions with a solution temperature of 70 °C, a 1 h reaction time, and a concentration of 4% citric acid. The purity of the extracted silica was greater than 92%, and the average particle size was 80 nm. Various techniques (X-ray fluorescence, X-ray diffraction, particle size analyzer, atomic force microscopy, the Brunauer–Emmett–Teller method, and scanning elec- tron microscopy) were used to detect the compositions, structures, particles distribution, surface area, and morphology of the prepared palm ash nano-silica (PANS). The PANS can be used as admixtures to enhance the mechanical properties of cement mortar. The results showed a 31% and 29% improvement in compressive and tensile strengths, respectively, under optimum conditions, and a weight of 6% and 10%, respectively, at 28 days of age. To the best of our knowledge, no work has previously prepared nano-silica from PA for use in cement mortars
ABSTRACT
This work aimed to prepare and characterize nano-silica (SiO2) from agricultural waste (palm ash) through a leaching treat- ment process using citric acid (C6H8O7). These waste materials (if present in large quantities) could lead to environmental issues, since palm waste materials are burned in a furnace at 700 °C for 5 h. The produced palm ash (PA) was treated with different concentrations of citric acid solution (1–5%). Subsequently, the PA was crushed for 1 h in a ball-milling machine to minimize particle size and enhance reactivity for the leaching process. The pure extracted silica balls were then milled for 2 h. The results showed that silica could be extracted from PA using citric acid leaching treatment under the optimum extrac- tion conditions with a solution temperature of 70 °C, a 1 h reaction time, and a concentration of 4% citric acid. The purity of the extracted silica was greater than 92%, and the average particle size was 80 nm. Various techniques (X-ray fluorescence, X-ray diffraction, particle size analyzer, atomic force microscopy, the Brunauer–Emmett–Teller method, and scanning elec- tron microscopy) were used to detect the compositions, structures, particles distribution, surface area, and morphology of the prepared palm ash nano-silica (PANS). The PANS can be used as admixtures to enhance the mechanical properties of cement mortar. The results showed a 31% and 29% improvement in compressive and tensile strengths, respectively, under optimum conditions, and a weight of 6% and 10%, respectively, at 28 days of age. To the best of our knowledge, no work has previously prepared nano-silica from PA for use in cement mortars
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