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Journal articles on the topic 'Cao method'

Author: Grafiati

Published: 3 June 2025

Last updated: 20 July 2025

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1

Babu, Numbury Surendra, and Didugu Jayaprakash. "Computational Study of the Stability of Tautomers and equilibrium constants of Cyanuric acid (CA) in Different solvents." JOURNAL OF ADVANCES IN CHEMISTRY 11, no. 2 (2015): 3485–97. http://dx.doi.org/10.24297/jac.v11i2.6691.

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In the present investigation, the tautomeric and equilibrium of Cyanuric acid has been studied using Hartifock (HF) method in the gas phase and different solvents using the PCM model. The relative energies of these tautomers have been calculated at the HF level of theory using 6-311++ G (d,p) basis set. Energetics and relative stabilities of the tautomers were compared and analyzed in both the gaseous and different solvents. The results indicate that the keto tautomer (CA1) is the most stable form in the gas phase and other solvents. The order of stability of isomers was found to be CA1 > C

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2

Bian, K., and R. D. Bukoski. "Modulation of resistance artery force generation by extracellular Ca2+." American Journal of Physiology-Heart and Circulatory Physiology 269, no. 1 (1995): H230—H238. http://dx.doi.org/10.1152/ajpheart.1995.269.1.h230.

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We tested the hypothesis that increasing extracellular Ca2+ (Cao) over a physiological concentration range depresses vascular smooth muscle force generation by altering the intracellular Ca2+ (Cai)-force relationship. Mesenteric resistance arteries were isolated from Wistar rats; Cai and isometric force were measured using a fura-based method and wire myography. Vessels were depleted of releasable Cai by repeated contraction with norepinephrine; Cao was then cumulatively added back from 0.025-2.5 mM in the presence of an agonist. With norepinephrine, serotonin, prostaglandin F2 alpha, and K+,

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3

Mahardika, Ida Bagus Putra, Wega Trisunaryanti, Triyono Triyono, Dwi Putra Wijaya, and Kumala Dewi. "Transesterification of Used Cooking Oil Using CaO/MCM-41 Catalyst Synthesized from Lapindo Mud by Sonochemical Method." Indonesian Journal of Chemistry 17, no. 3 (2017): 509. http://dx.doi.org/10.22146/ijc.26561.

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Transesterification of waste cooking oil using CaO/MCM-41 synthesized from Lapindo mud by the sonochemical method has been carried out. The silica was separated from the mud by reflux method used 6 M HCl and 6 M NaOH. The silica was then analyzed by XRF and used as silica source in MCM-41 synthesis. The synthesis of MCM-41 was carried out by the sonochemical method, then analyzed by XRD, Infrared spectrophotometer, SAA, and TEM. The Ca2+ was loaded onto the MCM-41 by wet impregnation method under variation of the Ca2+ content of 1.15, 1.29, 2.39, and 3.25 wt.% analyzed by ICP produced CaO(1),

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4

Li, Bingrong, Yaowu Wei, Nan Li, Tao Zhang, and Jinhu Wang. "Effect of Al(OH)3 and La2O3 on the sintering behavior of CaO granules via CaCo3 decomposition." Science of Sintering 52, no. 2 (2020): 195–206. http://dx.doi.org/10.2298/sos2002195l.

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Hydration resistance of CaO aggregates is the key to the successful application of lime-based refractories. Granulation technology on limestone with additives and one step calcination method was used in this study to investigate the effects of Al(OH)3 and La2O3 on the sintering behavior and the hydration resistance of CaO granules. The result showed that the hydration resistance of CaO granules was improved significantly by adding Al(OH)3 and La2O3. The shell of sintered CaO granules was relatively dense after calcination and the specific surface area of CaO granules decreased from 7.5?10-2 m2

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5

Yang, Shi Mei, Shao Yun Shan, Qing Ming Jia, Ting Wei Hu, Li Hong Jiang, and Ya Ming Wang. "Preparation of Fibrous CaO Sorbent by Hydrothermal Method." Advanced Materials Research 534 (June 2012): 86–88. http://dx.doi.org/10.4028/www.scientific.net/amr.534.86.

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Using urea and calcium chloride as precipitator and calcium source, fibrous CaCO3 precursors were prepared using hydrothermal method, then fibrous CaO sorbent was obtained by calcination. The influence of hydrothermal temperature on CO2 absorption properties was discussed. X-ray diffraction analysis showed that pure CaCO3 phase with aragonite and calcite crystal forms was obtained. Scanning electron microscopy analysis showed that the resultant CaO sorbent presented a fibrous microstructure, which inherited the morphologies of CaCO3. The absorption capacity of the resultant CaO sorbent reached

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6

Zeng, Wei Jin, Chao Zeng, and Wei He. "Quantitative Phase Analyses of a Slag Using X-Ray Powder Diffraction." Advanced Materials Research 881-883 (January 2014): 1241–44. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1241.

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The quantitative phase analyses of a slag have been successfully carried out by using both of the full-profile Rietveld and RIR methods from X-ray powder diffraction data. The qualitative phase analysis indicates that the slag contains mayenite (CaO)12(Al2O3)7, olivine Ca2(SiO4), gehlenite Ca2Al (AlSiO7), lemite Ca2(SiO4) and hibonite CaO(Al2O3)6. The quantitative analysis from Rietveld refinement shows that the weight concentrations of mayenite, olivine, gehlenite, lemite and hibonite for the slag are 48.8(4) wt.%, 32.2(5) wt.%, 11.0(9) wt.%, 6.2(1.1) wt.% and 1.8 (1.2) wt.%, respectively. Th

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7

Kuljanin, Tatjana A., Vladimir S. Filipović, Milica R. Nićetin, Biljana Lj Lončar, Bojana V. Filipčev, and Lato L. Pezo. "CaO&CaSO4 and CaO&Al2(SO4)3 as Pectin Precipitants–Model of Overlapping Diffuse Layers." Periodica Polytechnica Chemical Engineering 63, no. 1 (2018): 239–45. http://dx.doi.org/10.3311/ppch.12320.

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This work is concerned with the theoretical basis of novel sugar beet juice purification method using binary systems CaO&CaSO4 and CaO&Al2(SO4)3. The Gouy–Chapman–Stern (GCS) model of overlapping of diffuse layers of EDLs on pectin surface and that on Ca2+ and Al3+ ions, theoretically explains this method. The change of the zeta potential was used to quantitatively indicate overlapping of diffuse layers. For the experiment two model solutions of pectin (0.1 % w/w) were prepared, while the concentrations of CaO&CaSO4 and CaO&Al2(SO4)3 in the range of 50–500 g dm-3 were used. The

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8

Simpen, I. Nengah, I. Nyoman Suprapta Winaya, I. Ketut Suarsana, and I. Ketut Gede Sugita. "Green nanocomposite of silica-supported CaO: synthesis by sol-gel method and characterization." EUREKA: Physics and Engineering, no. 6 (November 28, 2024): 151–61. http://dx.doi.org/10.21303/2461-4262.2024.003407.

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The sol-gel method offers several advantages over other techniques for synthesizing nanocomposites, including simplicity, cost-effectiveness, and low processing temperatures. In this study, a silica-supported CaO nanocomposite was synthesized using eggshells as the calcium source and rice husk ash as the silica support via the sol-gel method. The green silica-supported CaO nanocomposite was characterized using various techniques, including BET surface area and porosity analysis, FTIR for functional groups identification, XRD for crystallinity and crystallite size determination, SEM and TEM for

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9

Wang, Haocheng, Haoming Ning, Zhenjun Fan, and Guangyao Liu. "Analysis of Phase Diagram of CaO-CoOx-ErOy and Crystal Structure of Perovskite (Ca3−xErx)Co2O6−z Solid Solution." Energies 16, no. 13 (2023): 4958. http://dx.doi.org/10.3390/en16134958.

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In this work, a series of compounds in the CaO-CoOx-ErOy ternary oxide system were synthesized in air at 885 °C, using a high temperature solid-phase synthesis method. The phase boundary of each solid solution region in the CaO-CoOx-ErOy system was determined by X-ray powder diffraction techniques. The phase diagram of the CaO-CoOx-ErOy system at 885 °C includes three series of ternary oxide solid solutions: (Ca3−xErx)Co4O9−z (0 ≤ x ≤ 0.9), (Ca3−xErx)Co2O6−z (0 ≤ x ≤ 1.25), and (Er1−xCax)CoO3−z (0 ≤ x ≤ 0.33). Four three-phase regions and five solid solution tie-line regions were obtained. The

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10

Guan, Wei, Fangying Ji, Yong Cheng, et al. "A Novel Synthesis Method of Porous Calcium Silicate Hydrate Based on the Calcium Oxide/Polyethylene Glycol Composites." Journal of Nanomaterials 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/542109.

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This paper proposed a novel method to prepare porous calcium silicate hydrate (CSH) based on the calcium oxide/polyethylene glycol (CaO/PEG2000) composites as the calcium materials. The porosity formation mechanism was revealed via X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), Brunauer-Emmett-Teller (BET), and Fourier transformed infrared spectroscopy (FT-IR). The reactivity of silica materials (SiO2) enhanced by increasing pH value. Ca2+could not sustain release from CaO/PEG2000and reacted with caused by silica to form CSH until the hydrothermal temperature rea

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11

Wen, Tianpeng, Yao Jin, Chen Tian, Lei Yuan, and Jingkun Yu. "Synthesis of calcium aluminate powders by ethanol thermal decomposition method." Processing and Application of Ceramics 15, no. 4 (2021): 403–9. http://dx.doi.org/10.2298/pac2104403w.

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The aim of this work was the synthesis of calcium aluminate powders at a relatively low temperature via the ethanol thermal decomposition method. The effect of the cation concentration in the ethanol solution and CaO contents incorporated in calcium aluminate materials on the structure of the prepared calcium aluminate powders in terms of phase composition, particle size distribution and specific surface area were investigated. It was demonstrated that the prepared powders containing 40 wt.% of CaO were mainly composed of CaAl2O4 and CaAl4O7 phases, while Ca3Al2O6 and Ca12Al14O33 became the ma

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12

Widia, Lilik, Roniyus Marjunus, and Sudibyo Sudibyo. "Penggunaan Metode Taguchi untuk Menentukan Kondisi Parameter Optimum Pada Pembuatan CaO dari Batu Kapur (CaCO-3)." Journal of Energy, Material, and Instrumentation Technology 2, no. 1 (2021): 23–29. http://dx.doi.org/10.23960/jemit.v2i1.46.

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Research has been carried out to determine the optimum conditions for making quicklime (CaO) using the Taguchi Method. CaO is the burning result of limestone (CaCO_3) in calcination process by releasing of CO_2 gas until CaO solids occur. The limestone was calcined at 950^o c. The Taguchi Method is a quality improvement technique with the selection of the most influential parameters of the making of process CaO. The parameters are particle size, CaO mass, heating temperature and stirring time. The XRF results show that the levels of CaO after the Taguchi Method design has increased from 98.779

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13

Küçük, Elvan, and Jale Naktiyok. "Investigation of catalytic pyrolysis of Erzurum-Umutbaca coal by using the thermal analysis method." Polish Journal of Chemical Technology 27, no. 1 (2025): 29–37. https://doi.org/10.2478/pjct-2025-0004.

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Abstract In the study, the catalytic pyrolysis behavior of low-rank Umutbaca coal with the addition of CaO was examined using thermal analysis methods. For this purpose, the effect of adding CaO to coal on both the pyrolysis temperatures of the coal and the composition of the gas and solid product (char) was investigated. Also, the kinetic analysis was carried out to characterize the catalytic pyrolysis process by adding CaO to coal. Using the data obtained in TGA at heating rates of 2.5, 5, and 10 °C/min, the activation energies required for the pyrolysis process of coal both with and without

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14

Maeda, Hirotaka, Yuki Nakano, and Toshihiro Kasuga. "Preparation of CaO-SiO2Glass-Ceramic Spheres by Electrospraying Combined with Sol-Gel Method." Journal of Nanomaterials 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/463048.

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CaO-SiO2glass-ceramic spheres were prepared by an electrospray method using hydrolyzed silicon alkoxide containing calcium nitrate. Crystalline calcium silicates, such as Ca2SiO4andβ-CaSiO3, formed around the surface of the spheres after heat treatment. The dissolution of the crystal phase of the spheres caused the release of Ca2+and Si4+ions during the initial stage of soaking in Tris-buffer solution, leading to the formation of nanosized pores at the sphere surface. The incorporation of Ca2+ions into the glassy phase of the spheres suppressed the rapid pH increase during the initial stage of

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15

Munawaroh, Fatimatul, Yoga Masdya, Malik Anjelh Baqiya, and Triwikantoro Triwikantoro. "SYNTHESIS AND CHARACTERIZATION OF CaO PREPARED FROM LIMESTONE USING SOL-GEL METHOD." Indonesian Physical Review 7, no. 2 (2024): 249–58. http://dx.doi.org/10.29303/ipr.v7i2.313.

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The sol-gel method has been successfully applied to the synthesis and characterization of calcium oxide (CaO) derived from calcite-based natural limestone from Pamekasan, Madura, East Java Indonesia. Controlled dissolution, titration, gel formation, and subsequent calcination at temperatures 650°C and 900°C were the steps involved in the synthesis. X-ray diffraction was used for characterization to identify the phase that had formed. Supporting software, MATCH! used to analyze the phases and structures and Rietica for refinement using the Rietveld method. The Ca(OH)2 phase formed was 59.65 ± 2

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16

Prodjosantoso, A. K., Y. Febriadi, A. R. P. Utami, and M. P. Utomo. "The Stabilization of Copper and Cadmium in The Hydrated CaO-CuO-SiO2 and CaO-CdO-SiO2 Composites." Nature Environment and Pollution Technology 23, no. 2 (2024): 947–57. http://dx.doi.org/10.46488/nept.2024.v23i02.029.

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The stabilization of toxic metals in the stable matrices is quite well-known. Research on copper and cadmium stabilization in the CaO-CuO-SiO2 and CaO-CdO-SiO2 composites was conducted to study the characteristics of CaO-CuO-SiO2 and CaO-CdO-SiO2 composites as well as the Cu and Cd metals stabilization in the hydrated composites. The composites of CaO-CuO-SiO2 and CaO-CdO-SiO2 were synthesized by the solid-state reaction method. A stoichiometric amount of CaO, SiO2, Cu(NO3)2, and CdO were calcined at 1050°C for 4 hours. The synthesized compounds were further hydrated in a soaking time of 30, 6

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17

Li, Shijian, Guoyu Qian, Yiwei Sun, Sheng Pang, Dong Wang, and Zhi Wang. "Innovative separation model for boron removal from silicon during slag refining based on ion and molecule coexistence theory." Metallurgical Research & Technology 119, no. 3 (2022): 304. http://dx.doi.org/10.1051/metal/2022024.

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How to reduce boron concentration to an extremely low level has become a major obstacle during silicon waste recycling. As a simple and efficient method of removing impurities, slag refining plays an increasingly important role for industrial silicon waste recovery. The deboration ability of slag is usually evaluated by boron distribution ratio LB. However, the development of a separation prediction model is challenged by the limitations on the recognition of impurity structure in slag and complexity of slag-silicon reactions. Herein, a novel thermodynamic model for predicting boron distributi

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18

Widyarini, Widyarini, Muhammad Djoni Bustan, and Sri Haryati. "Synthesis and Characterization of CaO-Zeolite Catalyst by Sonochemical Engineering Method." Indonesian Journal of Fundamental and Applied Chemistry 7, no. 3 (2022): 113–21. http://dx.doi.org/10.24845/ijfac.v7.i3.113.

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Calcium Oxide (CaO) loaded on zeolite was categorized as a heterogeneous catalyst. The utilization of CaO catalyst could be implemented in catalytic pyrolysis enhance gaseous production. In this paper, CaSO4.2H2O is an active site embedded in natural zeolite, and the activity of the CaO-Zeolite catalyst is synthesized by a sonochemical impregnation-assisted drying process and calcination. The stirrer impregnation method was used as a control. CaO-Zeolite catalyst characterization and properties were identified via Scanning Electron Microscopy- Energy Dispersive X-Ray (SEM-EDX).The activation e

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19

Suprapto, Suprapto, Tikha Reskiani Fauziah, Meiske S. Sangi, Titie Prapti Oetami, Imroatul Qoniah, and Didik Prasetyoko. "Calcium Oxide from Limestone as Solid Base Catalyst in Transesterification of Reutealis trisperma Oil." Indonesian Journal of Chemistry 16, no. 2 (2018): 208. http://dx.doi.org/10.22146/ijc.21165.

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CaO catalysts were synthesized from limestone by thermal decomposition and coprecipitation methods. The CaO and MgO reference catalysts were also synthesized for comparison. The catalysts were characterized by X-ray diffractometer (XRD) and the analysis result was refined by Rietica software. CaO catalyst obtained by coprecipitation method has higher purity of CaO and lower MgO content than those of calcined CaO. The catalysts were also characterized by Fourier Transform Infrared (FTIR) spectroscopy. FTIR spectra showed that the catalysts can be easily hydrated and carbonated in air. The catal

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20

Pintana, Pakamon, and Nakorn Tippayawong. "Nonisothermal Thermogravimetric Analysis of Thai Lignite with High CaO Content." Scientific World Journal 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/216975.

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Thermal behaviors and combustion kinetics of Thai lignite with different SO3-free CaO contents were investigated. Nonisothermal thermogravimetric method was carried out under oxygen environment at heating rates of 10, 30, and 50°C min−1from ambient up to 1300°C. Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) methods were adopted to estimate the apparent activation energy (E) for the thermal decomposition of these coals. Different thermal degradation behaviors were observed in lignites with low (14%) and high (42%) CaO content. Activation energy of the lignite combustion was found to

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21

Oko, Syarifuddin, and Andri Kurniawan. "Modification of CaO Catalyst with Impregnation Method Using KoH in Biodiesel Synthesis from Waste Cooking Oil." Logic : Jurnal Rancang Bangun dan Teknologi 19, no. 2 (2019): 62. http://dx.doi.org/10.31940/logic.v19i2.1318.

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Chicken eggshells can be used as raw material in the manufacture of CaO catalysts. Increased CaO catalyst activity can be done by the impregnation method. The purpose of this study was to determine the effect of %K on the wet impregnation of CaO catalyst using KOH and to find out the impregnation catalyst (CaO / K2O) on the biodiesel yield. Prepared chicken egg shells were calcined at 900oC for 3 hours. Then the CaO obtained was impregnated using KOH with a variation of % K (5%, 7%, 9% and 12% (w / w)) while heated at 85oC. The impregnation product was calcined at 600oC for 5 hours. The impreg

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22

Sabir, Asmeati, Hammada Abbas, Ahmad Yusran Aminy, and Sapta Asmal. "Analysis of duck eggshells as hydroxyapatite with heat treatment method." EUREKA: Physics and Engineering, no. 4 (July 30, 2022): 16–24. http://dx.doi.org/10.21303/2461-4262.2022.002017.

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Duck eggshell contains very high calcium, making it a raw material for hydroxyapatite (HA) biomedical applications. The aim of this study was to synthesize natural HA from duck eggshell waste using cleaning, drying, smoothing with a smoothness level of passing is 200 meshes and heat treatment with temperature variations of 850 ºC, 900 ºC, and 950 ºC for one hour. The resulting HA material was characterized using X-ray fluorescence (XRF), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The results of the physical characteristics of raw duck eggshells without heat tre

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Sabir, Asmeati, Hammada Abbas, Ahmad Yusran Aminy, and Sapta Asmal. "Analysis of duck eggshells as hydroxyapatite with heat treatment method." EUREKA: Physics and Engineering, no. 4 (July 30, 2022): 16–24. https://doi.org/10.21303/2461-4262.2022.002017.

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Duck eggshell contains very high calcium, making it a raw material for hydroxyapatite (HA) biomedical applications. The aim of this study was to synthesize natural HA from duck eggshell waste using cleaning, drying, smoothing with a smoothness level of passing is 200 meshes and heat treatment with temperature variations of 850 ºC, 900 ºC, and 950 ºC for one hour. The resulting HA material was characterized using X-ray fluorescence (XRF), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The results of the physical characteristics of raw duck eggshells without heat tre

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24

Hu, Qizhi, Wei Yao, and Gaoliang Tao. "Research on Alkali-Activated Slag Stabilization of Dredged Silt Based on a Response Surface Method." Materials 17, no. 17 (2024): 4410. http://dx.doi.org/10.3390/ma17174410.

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To improve the resource utilization of dredged silt and industrial waste, this study explores the efficacy of using ground granulated blast furnace slag (GGBS), active calcium oxide (CaO), and sodium silicate (Na2O·nSiO2) as alkali activators for silt stabilization. Through a combination of addition tests, response surface method experiments, and microscopic analyses, we identified key factors influencing the unconfined compressive strength (UCS) of stabilized silt, optimized material ratios, and elucidated stabilization mechanisms. The results revealed the following: (1) CaO exhibited the mos

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25

Chang, Ren-Wei, Chin-Jung Lin, and Ya-Hsuan Liou. "Multicycle Performance of CaTiO3 Decorated CaO-Based CO2 Adsorbent Prepared by a Versatile Aerosol Assisted Self-Assembly Method." Nanomaterials 11, no. 12 (2021): 3188. http://dx.doi.org/10.3390/nano11123188.

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Calcium oxide (CaO) is a promising adsorbent to separate CO2 from flue gas. However, with cycling of carbonation/decarbonation at high temperature, the serious sintering problem causes its capture capacity to decrease dramatically. A CaTiO3-decorated CaO-based CO2 adsorbent was prepared by a continuous and simple aerosol-assisted self-assembly process in this work. Results indicated that CaTiO3 and CaO formed in the adsorbent, whereas CaO gradually showed a good crystalline structure with increased calcium loading. Owing to the high thermal stability of CaTiO3, it played a role in suppressing

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26

Han, Jianxun, Ruixue Sun, Xiuying Zeng, et al. "Rapid Classification and Quantification of Camellia (Camellia oleifera Abel.) Oil Blended with Rapeseed Oil Using FTIR-ATR Spectroscopy." Molecules 25, no. 9 (2020): 2036. http://dx.doi.org/10.3390/molecules25092036.

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Currently, the authentication of camellia oil (CAO) has become very important due to the possible adulteration of CAO with cheaper vegetable oils such as rapeseed oil (RSO). Therefore, we report a Fourier transform infrared (FTIR) spectroscopic method for detecting the authenticity of CAO and quantifying the blended levels of RSO. In this study, two characteristic spectral bands (1119 cm−1 and 1096 cm−1) were selected and used for monitoring the purity of CAO. In combination with principal component analysis (PCA), linear discriminant analysis (LDA), and partial least squares regression (PLSR)

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Firnanelty, Firnanelty, Andi Nur Fitriani Abubakar, Anas Qurniawan, and M. A. Syam. "Comparison of Air Contact And Distilled Water Distribution Method in The Conversion of Cao to Ca(OH)2 As A Precursor Hydroxyapatite Synthesis." JKPK (Jurnal Kimia dan Pendidikan Kimia) 8, no. 3 (2023): 423. http://dx.doi.org/10.20961/jkpk.v8i3.78348.

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<p>Eggshells containing CaCO<sub>3</sub> have potential as bioceramics for several tissue engineering applications. The content of CaCO<sub>3</sub> converted into Ca(OH)<sub>2</sub> can be used as a precursor to implant material. The purpose of the study was to compare two methods of converting CaO into Ca(OH)<sub>2</sub> as the primary material for making hydroxyapatite. The method used is direct contact with air and dissolution with water. Hydroxyapatite synthesis using Ca(OH)<sub>2</sub> is calcined from CaCO<sub>3 <

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28

Zhang, Qi, Yaowu Wei, Tao Zhang, Bingqiang Han, Kui Liu, and Bo Chen. "Preparation of CaO granules using the granulation method." Advances in Applied Ceramics 117, no. 6 (2018): 334–39. http://dx.doi.org/10.1080/17436753.2017.1422333.

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Tang, Zhen-Xing, David Claveau, Ronan Corcuff, Khaled Belkacemi, and Joseph Arul. "Preparation of nano-CaO using thermal-decomposition method." Materials Letters 62, no. 14 (2008): 2096–98. http://dx.doi.org/10.1016/j.matlet.2007.11.053.

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Akatobi, K. N., B. I. Okolo, O. Adeyi, et al. "Synthesis and characterisation of CaO nanoparticle from oyster shell using sol-gel method." LAUTECH Journal of Engineering and Technology 8, no. 2 (2024): 101–9. http://dx.doi.org/10.36108/laujet/4202.81.0290.

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Because human activity is constantly increasing the content of heavy metals, heavy metal removal becomes a major challenge in wastewater treatment. In an attempt to provide an innovative and sustainable option for addressing the said challenge, this study is aimed at the synthesis and characterization of nano-based CaO biosorbent from oyster shell. The sol- gel method was used to synthesize the biosorbent, characterized using FTIR, XRD, SEM and BET respectively. From the analysis conducted, the developed CaO nanoadsorbent has a point of zero charge of 5.6, indicating stable charge balance. The

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Zhang, Bo, Chengjun Liu, and Maofa Jiang. "A new method of red mud recycling in the process of hot metal pretreatment." Metallurgical Research & Technology 117, no. 1 (2020): 115. http://dx.doi.org/10.1051/metal/2020010.

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To realize a large-scale consumption of red mud in the steelmaking industry, a new recycling method was investigated through the pre-reduction roasting experiment and the slag-metal interaction experiment simulating the hot metal pretreatment process in the steelmaking industry. In virtue of the sensible heating of the hot metal and the reducibility of [C] and [Si], the iron could be separated and recovered from the pre-reduced red mud pellets into the hot metal directly with a recovery rate exceeding 75%. With the composition adjustment of the residual oxides in the pre-reduced red mud (PRRD)

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Mohd Daud, Farah Diana, Muhammad Mirza Mohamad Azir, Mudrikah Sofia Mahmud, Norshahida Sarifuddin, and Hafizah Hanim Mohd Zaki. "PREPARATION OF CaO-BASED PELLET USING RICE HUSK ASH VIA GRANULATION METHOD FOR POTENTIAL CO2 CAPTURE." IIUM Engineering Journal 22, no. 1 (2021): 234–44. http://dx.doi.org/10.31436/iiumej.v22i1.1544.

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CO2 capturing has become very significant option to reduce the emission of CO2 in the atmosphere and hence, minimizing environmental issues.Among solid CO2 sorbent, calcium oxide (CaO) is an attractive regenerable sorbent for CO2 capturing because of their reactivity and high CO2 absorption capacity. CaO alone suffers from rapid decay of CO2 adsorption during multiple carbonation/calcination reaction cycles. The stability of CaO sorbents during cyclic runs can be achieved via the incorporation of additive support materials. The silica (SiO2) from natural sources such as rice husk is the best c

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Avram, Daniela, Dan Ungureanu, Nicolae Angelescu, and José Barroso de Aguiar. "A Comparative Study on the Properties of Potentially Bioactive Glasses Obtained by Sol-Gel Technique and by Melting Mixtures of Oxides." Scientific Bulletin of Valahia University - Materials and Mechanics 15, no. 13 (2017): 18–24. http://dx.doi.org/10.1515/bsmm-2017-0013.

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AbstractPhosphocalcic glasses, based on ternary system SiO2 - CaO- P2O5 and those doped with copper (SiO2 – CaO - P2O5 - Cu2O) can be obtained by the traditional method of sub-cooling melts or modern methods such as process that uses mechanical energy, neutrons action, deposition in thin layers or by sol-gel technique. This paper shows the experimental results of three compositional phosphocalcic glasses: 50% SiO2 - 43% CaO - 7% P2O5, 50% SiO2 - 38% CaO - 7% P2O5 - 5% Cu2O obtained through sol-gel method and 45% SiO2 - 22.5% CaO - 22.5 Na2O - 5% P2O5 - 5% Cu2O obtained by melting. In order to

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Aziz, Hidayah Mohd, Noor Idayu Masrom, Nur Fatin Sulaiman, Mohd Khairul Asyraf Amat Mustajab, and Abdul Rahim Yacob. "Effect of Hydration-Dehydration Activation on the Basic Strength of Nano Structured Alkaline Earth Metal Calcium Oxide." Advanced Materials Research 383-390 (November 2011): 3835–39. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3835.

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The study of physicochemical properties such as surface area, particle size and basicity of heterogeneous catalysts is in great interest nowadays. CaO yield a number of surface defects centers and these were important especially for heterogeneous catalyst. In this study, nano structured CaO was synthesized via hydration-dehydration method. The basic strength of the prepared CaO was also studied using simple back titration method with respect to the activation temperature. This result revealed that, the basic strength increases with the increasing of activation temperature. As the nano structur

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Dudek, Magdalena, and Alicja Rapacz-Kmita. "CaZrO3-based powders suitable for manufacturing electrochemical oxygen probes." Open Chemistry 11, no. 12 (2013): 2088–97. http://dx.doi.org/10.2478/s11532-013-0332-2.

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AbstractCalcium zirconate powders doped with a small amount of CaO were synthesised using the Pechini method. X-ray analysis revealed that solid solution was formed in the concentration up to 51.5% mol CaO. For synthesis of stoichiometric CaZrO3, the highest temperature was required (1150°C), but introduction of excess CaO from 50.5 to 51.5% mol enabled us to lower the synthesis temperature to 800°C. The sintering behaviour of such samples under non-isothermal conditions was studied by dilatometric methods. Deviations were found in stoichiometry; by increasing the CaO concentration in CaZrO3 s

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Yacob, Abdul Rahim, Nur Fatin Sulaiman, and Maimoonah Khalid Qasim. "Surface Modified Nano Calcium Oxide for Base Heterogeneous Transesterification of Kappaphycus Alvarezii Seaweed to Biofuel." Advanced Materials Research 974 (June 2014): 262–66. http://dx.doi.org/10.4028/www.scientific.net/amr.974.262.

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The study of physicochemical properties of solid catalyst such as particle size, surface area and basicity are significant today since their reactivity depend on these properties. The number of defect sites in CaO, an alkaline metal oxide is important in heterogeneous catalysis. In this research work, nanostructured CaO was synthesized from commercial CaO via hydration-dehydration method. The surface modified CaO was calcined at various temperatures from 300°C to 800°C respectively under vacuum atmosphere of 10-3mbar. The prepared nanostructured CaO was then characterized using Thermogravimetr

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Mohd Daud, Farah Diana, Nur Asyikin Kosen, Mudrikah Sofia Mahmud, Norshahida Sariffudin, and Hafizah Hanim Mohd Zaki. "Preparation of CaO-SiO₂ Adsorbent for Potential CO₂ Capture via Dry Mixing Method." Materials Science Forum 1025 (March 2021): 343–48. http://dx.doi.org/10.4028/www.scientific.net/msf.1025.343.

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Calcium-looping technology is defined as one of the most desirable methods of carbon capture, utilization and storage (CCUS). However, because of sintering, rapid deactivation of CaO-sorbents is currently a major barrier to this technology. The stability of calcium based sorbent may be enhance by incorporating them with inert support materials such as MgO, Al2O2, ZrO2 and SiO2. For this study, calcium based sorbent has been incorporate with silica obtained from rice husk ash. CaO-SiO2 sorbents are prepared using physical dry mixing method which is much simpler compared to other available metho

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Kou, Luyao, Junjing Tang, Tu Hu, Baocheng Zhou, and Li Yang. "Effect of CaO on catalytic combustion of semi-coke." Green Processing and Synthesis 10, no. 1 (2021): 011–20. http://dx.doi.org/10.1515/gps-2021-0002.

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Abstract Generally, adding a certain amount of an additive to pulverized coal can promote its combustion performance. In this paper, the effect of CaO on the combustion characteristics and kinetic behavior of semi-coke was studied by thermogravimetric (TG) analysis. The results show that adding proper amount of CaO can reduce the ignition temperature of semi-coke and increase the combustion rate of semi-coke; with the increase in CaO content, the combustion rate of semi-coke increases first and then decreases, and the results of TG analysis showed that optimal addition amount of CaO is 2 wt%.

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Imtiaz, Ayesha, Muhammad Akhyar Farrukh, Muhammad Khaleeq-ur-rahman, and Rohana Adnan. "Micelle-Assisted Synthesis of Al2O3·CaO Nanocatalyst: Optical Properties and Their Applications in Photodegradation of 2,4,6-Trinitrophenol." Scientific World Journal 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/641420.

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Calcium oxide (CaO) nanoparticles are known to exhibit unique property due to their high adsorption capacity and good catalytic activity. In this work the CaO nanocatalysts were prepared by hydrothermal method using anionic surfactant, sodium dodecyl sulphate (SDS), as a templating agent. The as-synthesized nanocatalysts were further used as substrate for the synthesis of alumina doped calcium oxide (Al2O3·CaO) nanocatalysts via deposition-precipitation method at the isoelectric point of CaO. The Al2O3·CaO nanocatalysts were characterized by FTIR, XRD, TGA, TEM, and FESEM techniques. The catal

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Tahya, Candra Yulius, Wahyu Irawati, Karnelasatri Karnelasatri, and Friska Juliana Purba. "Synthesis and Characterization of TiO2-CaO and TiO2-CaO-Fe2O3 Photocatalyst for Removal of Catechol." Molekul 14, no. 2 (2019): 140. http://dx.doi.org/10.20884/1.jm.2019.14.2.570.

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TiO2-CaO and TiO2-CaO-Fe2O3 photocatalysts have been synthesized through the surfactant-assisted sol-gel method. The catalysts were characterized using XRD, FTIR, SEM-ED Sand BET surface area. XRD pattern showed the formation of anatase TiO2 crystal phase both in TiO2-CaO and TiO2-CaO-Fe2O3. The TiO2-CaO has higher crystallinity than TiO2-CaO-Fe2O3. Based on the peak refinement using Rietveld, there are two peaks identified as Fe2O3 hematite in the sample TiO2-CaO-Fe2O3. BET surface area analysis showed that the average pore size of TiO2-CaO and TiO2-CaO-Fe2O3 catalysts are 8.04 and 8.41 nm re

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Li, Z. S., P. T. Liang, and N. S. Cai. "A rate equation theory for the pore size distribution of calcined CaCO3 in calcium looping." Faraday Discussions 192 (2016): 197–216. http://dx.doi.org/10.1039/c6fd00019c.

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CaCO<sub>3</sub> calcination is an important step in calcium looping, and the formed pore structure of porous CaO is critical for subsequent carbonation towards carbon dioxide. Therefore, it is necessary to investigate the evolution of the pore structure of the sorbent in the calcination step. A mathematical model describing the pore size distribution during the calcination of the CaCO<sub>3</sub> particle was developed. CaCO<sub>3</sub> calcination is calculated following a shrinking core model at the CaO–CaCO<sub>3</sub> interface, and CO<sub>2</sub> diffuses through the porous CaO layers. D

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Pantic, Jelena, Volker Kahlenberg, Vesna Poharc-Logar, and Aleksandar Kremenovic. "Natural CaO-TiO2-SiO2 based ceramics." Processing and Application of Ceramics 5, no. 2 (2011): 79–84. http://dx.doi.org/10.2298/pac1102079p.

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Lesnica river deposits consist of a large number of minerals of different grain sizes including sphene. Since it is very difficult to obtain pure monophase titanite by different synthetic routes (sol-gel, coprecipitation, combustion, spray pyrolysis and hydrothermal method), the aim of this work was to study the structure of the sphene from the Lesnica river deposits and possibility of using it as a natural precursor for CaO-TiO2-SiO2 based ceramics. The sphene from Lesnica was analyzed by different methods: tristimulus colorimetry, infrared spectroscopy, electron microprobe and X-ray single c

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Tan, Hong Bo, Kai Ke, Bao Guo Ma, and Jun Xiao. "Effect and Solid Solution Mechanism of Co₂O₃ during C₃S Formation." Advanced Materials Research 146-147 (October 2010): 1587–92. http://dx.doi.org/10.4028/www.scientific.net/amr.146-147.1587.

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C3S is one of the most important mineral phases in silicate cement clinker; alternative ions could be solidified into C3S crystal lattice. Therefore, the research on solid solution mechanism was studied, which was about C3S doped with ions, Meanwhile, the achievement of this paper could be taken as a guidance for cement clinker industry. The effect and solid solution mechanism of Co2O3 during C3S formation were studied by means of chemical analysis, XRD and phase diagram analysis. The results show that when Co2O3 additive was less than 1.5% in mass, the content of f-CaO increased with the incr

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Thanakkasaranee, Sarinthip, Pornchai Rachtanapun, Chitsiri Rachtanapun, et al. "Bio-Composite Films Based on Carboxymethyl Chitosan Incorporated with Calcium Oxide: Synthesis and Antimicrobial Activity." Polymers 16, no. 17 (2024): 2393. http://dx.doi.org/10.3390/polym16172393.

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The utilization of biopolymers incorporated with antimicrobial agents is extremely interesting in the development of environmentally friendly functional materials for food packaging and other applications. In this study, the effect of calcium oxide (CaO) on the morphological, mechanical, thermal, and hydrophilic properties as well as the antimicrobial activity of carboxymethyl chitosan (CMCH) bio-composite films was investigated. The CMCH was synthesized from shrimp chitosan through carboxymethylation, whereas the CaO was synthesized via a co-precipitation method with polyethylene glycol as a

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Băbuţă, R., I. Lazău, and C. Păcurariu. "Study of CaO·2Al2O3 formation by polymeric precursor method." Journal of Thermal Analysis and Calorimetry 112, no. 1 (2012): 339–44. http://dx.doi.org/10.1007/s10973-012-2656-0.

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Katayama, I., N. Kemori, and W. T. Denholm. "Thermodynamic study of CaO-Sb2O3 system by emf method." Berichte der Bunsengesellschaft für physikalische Chemie 102, no. 9 (1998): 1272–74. http://dx.doi.org/10.1002/bbpc.19981020935.

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Li, Hua, Jia Ping Liu, Qian Tian, and Shou Zhi Zhang. "Hydration Kinetics and Microscopic Analysis of Calcium Oxide Expansion Clinker." Applied Mechanics and Materials 477-478 (December 2013): 908–14. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.908.

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Hydrating and calcining method combined with the kinetic equation were adopted to describe the hydration kinetics process of the laboratory-calcined CaO expansion clinker, XRD and SEM were used to test and analysis its mineral compo-sition and microstructure as well. The results show that, hydration reaction process in pure water of f-CaO contained in the CaO expansion clinker meets the Avrami isothermal crystallization kinetics model, and the hydration degree increases with temperature, with the relation between reaction rate constant and temperature conforming to Arrhenius law; the CaO expan

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Pujiastuti, Caecilia, Srie Muljani, and Ketut Sumada. "Precipitated calcium oxide nanosize from limestone and blood clam shells." Journal of Natural Sciences and Mathematics Research 9, no. 1 (2023): 12–18. http://dx.doi.org/10.21580/jnsmr.2023.9.1.13209.

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Calcium oxide (CaO) is a product that is needed by various types of industries such as the pharmaceutical, chemical, agricultural and health industries. CaO is generally produced by the calcination method of CaCO3 materials such as calcium carbonate rocks or from various types of shells. The calcination method requires a large amount of energy because the operating temperature is above 1000 C and the resulting calcium oxide product is still micrometer size. This study developed nanosize precipitated CaO from two calcium sources, namely blood clam shells and limestone. For clam shells using hyd

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Pujiastuti, Caecilia, Srie Muljani, and Ketut Sumada. "Precipitated calcium oxide nanosize from limestone and blood clam shells." Journal of Natural Sciences and Mathematics Research 9, no. 1 (2023): 12–18. http://dx.doi.org/10.21580/jnsmr.2023.9.1.13209.

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Calcium oxide (CaO) is a product that is needed by various types of industries such as the pharmaceutical, chemical, agricultural and health industries. CaO is generally produced by the calcination method of CaCO3 materials such as calcium carbonate rocks or from various types of shells. The calcination method requires a large amount of energy because the operating temperature is above 1000 C and the resulting calcium oxide product is still micrometer size. This study developed nanosize precipitated CaO from two calcium sources, namely blood clam shells and limestone. For clam shells using hyd

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Patricia Ese Umoru, Patricia Ese Umoru, Yusuf Sahabi Yusuf Sahabi, Abdullahi Isah Abdullahi Isah, Aminu Aliyu Aminu Aliyu, and and Ibrahim Dankane Bafarawa and Ibrahim Dankane Bafarawa. "Synthesis of Calcium Oxide Nanoparticles, its Characterization, Effect on Soil pH and Kinetic Evaluation in Acidic Solution." Journal of the chemical society of pakistan 47, no. 1 (2025): 01. https://doi.org/10.52568/001627/jcsp/47.01.2025.

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Synthesis of calcium oxide nanoparticles (CaO NPs), its characterization and kinetic evaluation with phosphite ion and soil sample in acidic solution was evaluated. CaO NPs was synthesized by thermal decomposition method at 850 0C for 6 hours using calcium carbonate (CaCO3) as the raw material. The CaO nanoparticle was characterized by the use of X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM). The sharp peak of CaO NPs was found to be between 17.98o and 71.7o with average crystallized particle sizes of 27.43 and#177; 0.1. The morphology was found to be a flower shape with agglo

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