Hydroxyapatite [Ca 10 (PO 4) 6 (OH) 2] is natural ceramic material which is often used for artificial bone reconstruction.In this research, hydroxyapatite was synthesized from mineral of Calcite (CaCO 3) which obtained from the Campurdarat, Tulungagung.The hydroxyapatite synthesis steps are encompassed by the preparation of precursors and …
Limestone, one of the most abundant minerals on earth, possesses high calcium content of about 40.04 at%. 11 Thus, it can be used as a source for the synthesis of large-scale HAp powder. The synthesis method has a vital role in determining the morphology, crystal structure, and purity of the HAp. 12 Its crystal structure can be either ...
Limestone is a sedimentary rock composed primarily of calcite, a calcium carbonate mineral with a chemical composition of CaCO 3. It usually forms in clear, calm, warm, …
Earth-abundant mineral limestone obtained from North Sumatera, Indonesia, has been utilized to synthesize nano-hydroxyapatite (HAp). Although HAp is biocompatible to the human bone, its antibacterial activity is still very low. Herein, different metal ions (i.e., Ag, Cu, Zn, and Mg) were doped into HAp to improve t
Synthesis of waste limestone pow der–based alkali‑activated binder: experimental, optimization modeling, and ec o‑efficienc y assessment.
Natural dolomitic limestone (NDL) is employed as a heterogeneous green catalyst for the synthesis of medicinally valuable benzimidazoles, dihydropyrimidinones, and highly functionalized pyridines via C–N, C–C, and C–S bond formations in a mixture of ethanol and H 2 O under ultrasound irradiation. The catalyst is characterized by XRD, FTIR, Raman …
CaCO 3-rich raw materials, such as raw limestone and waste limestone powder abundantly available globally, could be used in the synthesis of such binders. The use of alkali-activated concrete as an alternative to the conventional Portland cement concrete would result in about 80% reduction in carbon dioxide emissions associated …
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.
Synthesis and Characterization of Sr 1-x La x Fe 12-y Co y O 19 Nanoparticles Prepared by a Sol-Gel Method Using Propylene Oxide p.873
Objective: In this study, the effect of hydrothermal temperature on the synthesis of hydroxyapatite (HAp) from limestone was investigated.Methods: Precursors of limestone (CaCO3) and diammonium ...
As a result, limestone can be used as an inexpensive adsorbent in the treatment of water . Green synthesis provides several advantages over conventional synthesis technologies, including being more freely diffused and using less chemicals that are naturally harmful and dangerous.
Limestone, one of the most abundant minerals on earth, possesses high calcium content of about 40.04 at%. 11 Thus, it can be used as a source for the …
Research has been done for synthesis gypsum from limestone in Central Sulawesi. This Research aims are to know the best ratio of sulphuric acid of limestone that producer the highest CaSO 4 and which areas in the Central Sulawesi as a producer of best limestone for the raw materials CaSO 4.
Currently, the most economic synthesis route of PCC as well as needle-like aragonite is by using a reaction of Ca(OH) 2 and CO 2 in water where Ca(OH) 2 comes …
This paper reports on the recycling of the Ca 2+ ion-rich filtrate of limestone sludge for use as a raw material in the hydrothermal synthesis of hydroxyapatite (HAp) applicable to the removal of Pb 2+ ions from aqueous solutions. Samples of HAp (eco-HAp) were prepared using a range of Ca/P molar ratios (Ca/P MRs) (1, 1.67, 2.33 and 3) and …
The typical alkyl donor for MT-catalyzed alkylation is S-adenosyl-L-methionine (SAM) and importantly, we and others have demonstrated NP, [] protein, [] and nucleic acid [] MTs to transfer alternative alkyl groups in the presence of suitably modified SAM analogs. However, reminiscent of the restriction imposed upon glycorandomization by sugar …
Limestone has a high calcium carbonate (CaCO 3) content, making it an ideal source of calcium for the synthesis of hydroxyapatite. This study aims to synthesize hydroxyapatite from limestone and analyze the results by examining the phase and crystallinity. CaO was obtained through the calcination of limestone at a temperature of 1000°C for 10 ...
The influences of calcium carbide residue and high-silicon limestone on the mineral composition and performance of belite-barium calcium sulphoaluminate cement were studied by means of X-ray diffraction, petrographic and SEM–EDS. The results showed that calcium carbide residue had low decomposition temperature, which could …
Limestone is a sedimentary rock made of calcium carbonate (CaCO 3), usually in the form of calcite or aragonite. It may contain considerable amounts of magnesium carbonate …
CaO catalysts were synthesized from limestone by thermal decomposition and coprecipitation methods. The CaO and MgO reference catalysts were also synthesized for comparison.
Developments in the aquaculture industry have increased the production of shellfish. However, the lack of a proper recycling method for discarded shells is resulting in marine environmental pollution.For the sustainable management of shellfish byproducts, pulverized oyster and scallop shell powder were used as major raw materials in cement …
Synthesis of hydroxyapatite from limestone by using precipitation method. M Sirait 1, K Sinulingga 1, N Siregar 1 and R S D Siregar 1. Published under licence by IOP Publishing Ltd Journal of Physics: Conference Series, Volume 1462, The 6th Annual International Seminar on Trends in Science and Science Education 16–17 October …
Synthesis and Formation Mechanism of Limestone-Derived Porous Rod Hierarchical Ca-based Metal-Organic Framework for Efficient CO 2 Capture Materials (Basel) . 2020 Sep 26;13(19):4297. doi: 10.3390/ma13194297.
Synthesis and Formation Mechanism of Limestone-Derived Porous Rod Hierarchical Ca-based Metal-Organic Framework for Efficient CO 2 Capture Materials …
It is suitable in prior work [4, 27] that PCC synthesis from limestone resulted in higher Ca purity. After modifying the surface of PCC with OA to form O-PCC, it achieved Ca purity of 97.9%. ...
For the synthesis of CMA, glacial acetic acid can be reacted with any one of dolomitic limestone (CaCO 3. MgCO 3), dolomitic quick lime (CaO.MgO), or dolomitic double hydrated lime (Ca(OH) 2.Mg(OH) 2). In order to make the process most economical, in the present study, dolomitic limestone was directly reacted with glacial acetic acid.
Calcium carbonate (CaCO 3) is one of the fifth most abundant biominerals in the Earth crust.It is an imperative material and formed in geological sources like limestone, chalk and marbles [1], and biological organisms such as corals, pearls, mollusk shells, egg shells [2].Biogenic calcium carbonate exists in six forms, three anhydrous crystalline …
The objective of this present study is to investigate the synthesis and characterization of Ca (OH) 2 from Indonesian limestone as endodontic intra-canal medicament. Limestone were taken from ...
Materials and the synthesis method. Twenty milliliters of 1 M CaCl 2 × H 2 O (≥ 95%, Sigma-Aldrich) and 20 ml of 2 M NaOH (≥ 98%, VWR Ltd.) were used as initial reagents for the synthesis of Ca(OH) 2 powder. During synthesis, the reagents are used in stoichiometric Ca +2:OH − = 1:2 mol ratio. First, both aqueous solutions (CaCl 2 and …
The limestones was abundant in Tuban, East Java and have high calcium mineral content. Nevertheless, in the economic value, limestone have low price. Aim the research is prepare Precipitated Calcium Carbonate (PCC) by caustic soda method. In this method, calcium was dissolved in HNO 3 with different concentration (2, 4,6, 8 M). The …
This study developed a novel approach to the hydrothermal synthesis of eco-hydroxyapatite (eco-HPA) from recycled limestone sludge for the removal of Cu2+ from aqueous solutions. The resulting eco-HPA was characterized using X-ray fluorescence, thermal field emission scanning electron microscope, X-ray powder …
Hydroxyapatite from limestone was synthesized by precipitation method. During the synthesization, the temperature of a 200 mesh sample was increased to 600°C for 3 hours. It was transformed CaCO3 into CaO powder. Then the CaO powder was dissolved with water to get Ca(OH)2, then it dissolved with H3PO4 0.3M as a source of …
The sharp and narrow absorption band at 3 640 cm-1 of Ca(OH) 2 synthesis from limestone is due . to stretching mode of O-H that present in the sa mple. The vibration m odes C-O of carbonate groups .
