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Artykuły w czasopismach na temat „Sodium hydroxide (NaOH)”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Mubarokah, Siti, Pada Mulia Raja, Rahimah, Rafael Remit Winardi, and Fachrizal. "PENGARUH PROSES NETRALISASI PADA SEMI VIRGIN RED PALM OIL DENGAN MENGGUNAKAN NATRIUM HIDROKSIDA (NaOH) TERHADAP KADAR ALB, KADAR KOTORAN DAN KADAR AIR." Jurnal Agro Fabrica 6, no. 1 (2024): 8–22. http://dx.doi.org/10.47199/jaf.v6i1.225.

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This research aims to determine the effect of the sodium hydroxide (NaOH) neutralization process in semi virgin red palm oil on free fatty acid levels, dirt levels and water content. Efforts to obtain the best quality red palm oil can be done by administering sodium hydroxide (NaOH). The method used in this research was a non-factorial Completely Randomized Design (CRD) using the chemical Sodium Hydroxide (NaOH) with concentrations of 3%, 4% and 5% of the sample weight. Each chemical and its concentration was repeated in 3 repetition units. The types of observations carried out are ALB levels,

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2

Jepsen, Lars H., Peikun Wang, Guotao Wu, et al. "Thermal decomposition of sodium amide, NaNH2, and sodium amide hydroxide composites, NaNH2–NaOH." Physical Chemistry Chemical Physics 18, no. 36 (2016): 25257–64. http://dx.doi.org/10.1039/c6cp01604a.

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Composites of NaNH<sub>2</sub> and the omnipresent NaOH have a lower melting temperature and form a non-stoichiometric solid solution, Na(OH)<sub>1−x</sub>(NH<sub>2</sub>)<sub>x</sub>, during heating.

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3

Ibrahim, Haruna, Shamsudeen Jibia, Ismail Mohammed, and Suleiman Magaji. "Biochemicals synthesis from dead leaves of Acacia auriculiformis over zinc chloride and sodium hydroxide." Applied Research Journal of Science and Technology 3, no. 3 (2022): 22–29. http://dx.doi.org/10.47721/arjst20220303022.

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This study was undertaken to investigate the biochemicals and biofuel feedstocks in the waste leaves of Acacia auriculiformis. A 50g mass of pulverized dead leaves of the tree were hydrolytically extracted using ZnCl2 and NaOH catalysts at 100oC for 30 minutes. The extracts were filtered with sheet cloth and 4g of each sample was analyzed with GC-MS. The highest fatty acid yield was 235.74 g over ZnCl2 and 222.82 g over NaOH. The highest yields of other prominent chemicals found were 28.17g furan methanol over ZnCl2, 14.18g spathulenol over NaOH, 55.55g Phytol over ZnCl2, 15.94g caryophyllene

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4

Mehta, Geeta, Anshul Garg, and Sanjay Kumar Sharma. "Self-compacting geopolymer concrete using Class F Fly Ash." IOP Conference Series: Earth and Environmental Science 1327, no. 1 (2024): 012005. http://dx.doi.org/10.1088/1755-1315/1327/1/012005.

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Abstract The development of self-compacting geopolymer concrete has the dual advantages of reducing environmental pollution and managing waste. The objective of the current experimental study is to create self-compacting geopolymer concrete with the best sodium silicate to sodium hydroxide ratio utilizing class F fly ash and sodium hydroxide. With varying sodium silicate to sodium hydroxide ratios (2.1, 2.3, 2.5, and 2.7), different molarities of sodium hydroxide (NaOH) (10M, 12M, and 14M) have been examined for workability and strength behavior. Self-compacting geopolymer concrete is found to

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5

Weng, Wubin, Tomas Leffler, Christian Brackmann, Marcus Aldén, and Zhongshan Li. "Spectrally Resolved Ultraviolet (UV) Absorption Cross-Sections of Alkali Hydroxides and Chlorides Measured in Hot Flue Gases." Applied Spectroscopy 72, no. 9 (2018): 1388–95. http://dx.doi.org/10.1177/0003702818763819.

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Spectrally resolved ultraviolet (UV) absorption cross-sections of gas-phase sodium chloride (NaCl), potassium hydroxide (KOH), and sodium hydroxide (NaOH) were measured, for the first time, in hot flue gases at different temperatures. Homogenous gas-phase NaCl, KCl (potassium chloride), NaOH, and KOH at temperatures 1200 K, 1400 K, 1600 K, and 1850 K were prepared in the post-flame zone of laminar flames by seeding nebulized droplets out of aqueous solution of corresponding alkali species. The amount of droplets seeded into the flame was kept constant, so the relative concentration of differen

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6

Ayyanar, Dhanalakshmi, Shahul Hameed Masthan Ali, Priyanka Kaliraj, Velci Shridevi Paulraj, and Kumar Rajendrakani. "Mechanical Behaviour of Geopolymer Concrete Using Steel Fibers." Advanced Materials Research 1178 (July 25, 2023): 159–68. http://dx.doi.org/10.4028/p-itp8he.

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This investigation inspects the concurrent influence of steel fibers with different materials such as Fly Ash(FA), Silica Fume(SF) and aggregates on the mechanical behaviour of geopolymer concrete (GPC) mixes. A range of 8 to 16 molar NaOH molarities variation was observed in the experimental work. Sodium hydroxide molar (NaOH) and sodium silicate solution (NaOH) were utilised as alkaline activators in proportions of 1, 1.5, and 2 (Na2SiO3/NaOH). Steel crimped fibers having aspect ratio of 60 were added in the geopolymer concrete. Geopolymer concrete properties considering type of fly ash, the

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7

Cloutier, Caroline R., Akram Alfantazi, and Elod Gyenge. "Physicochemical Properties of Alkaline Aqueous Sodium Metaborate Solutions." Journal of Fuel Cell Science and Technology 4, no. 1 (2006): 88–98. http://dx.doi.org/10.1115/1.2393310.

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Background: The transition to a hydrogen fuel economy is hindered by the lack of a practical storage method and concerns associated with its safe handling. Chemical hydrides have the potential to address these concerns. Sodium borohydride (sodium tetrahydroborate, NaBH4), is the most attractive chemical hydride for H2 generation and storage in automotive fuel cell applications, but recycling from sodium metaborate (NaBO2), is difficult and costly. An electrochemical regeneration process could represent an economically feasible and environmentally friendly solution. Method of Approach: We repor

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8

Kuliyev, Sadig, Yunus Emre Tas, and M. Selim Cogenli. "CONTROL OF CO2 ABSORPTION BY NaOH SOLUTION USING pH, CONDUCTIVITY AND TITRATION MEASUREMENTS." Chemical Problems 21, no. 2 (2023): 123–31. http://dx.doi.org/10.32737/2221-8688-2023-2-123-131.

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The article deals with the issue of CO2 utilization by sodium hydroxide absorption. Sodium hydroxide (NaOH) is able to react with CO2 under atmospheric conditions to form carbonate or bicarbonate ions in solution. This study focuses on the absorption of CO2 by an alkaline solvent in a bubble column. Carbonate or bicarbonate ions were measured during carbonization using pH, conductivity and titration.

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9

Klinkby, Esben, José Ignacio Marquez Damian, Douglas D. DiJulio, et al. "Development of thermal scattering kernels for sodium hydroxide." EPJ Web of Conferences 284 (2023): 17009. http://dx.doi.org/10.1051/epjconf/202328417009.

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NaOH was recently proposed as a moderator for the compact molten salt reactors, under development by Seaborg Technologies. In order to reliably predict the thermalisation of neutrons in such a reactor, the simulations must be based on modelling which accurately accounts for the low-energy neutron interactions in NaOH. This information is contained within thermal scattering libraries that are used during Monte-Carlo simulations. In this paper, we present the results of neutron scattering experiments carried out at VESUVIO, ISIS in order to facilitate the development thermal scattering libraries

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10

Kustirini, A., Antonius, and P. Setiyawan. "Effect of sodium hydroxide concentration on the compressive strength of geopolymer mortar using fly ash PLTU Tanjungjati B Jepara." IOP Conference Series: Earth and Environmental Science 955, no. 1 (2022): 012010. http://dx.doi.org/10.1088/1755-1315/955/1/012010.

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Abstract Geopolymer concrete is concrete that uses environmentally friendly materials, using fly ash from waste materials from the coal industry as a substitute for cement. To produce geopolymer concrete, an alkaline activator is required, with a mixture of Sodium Hydroxide and Sodium Silicate. This research is an experimental study to determine the effect of variations in the concentration of sodium hydroxide (NaOH) 8 Mol, 10 Mol, 12 Mol, and 14 Mol on the compressive strength of geopolymer concrete. Mortar Geopolymer uses a mixture of 1: 3 for the ratio of fly ash and sand, 2.5: 0.45 for the

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11

Lv, Ping, Xin Mao Li, and Wei Bo Huang. "Effect of Sulfuric Acid /Sodium Hydroxide /Sodium Chloride on Properties of Polyurea." Advanced Materials Research 194-196 (February 2011): 2330–33. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.2330.

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This paper mainly studies the glossnesschange、mechanical properties change and hardness change of polyurea coatings during the immersing experiment. The result of the glossness experiment shows that Qtech-116 polyurea sample glossness declining rate were 18.33%, 3.69% and 0.83% after immersed in 5％H2SO4、5％NaOH and 3.5％NaCl for 60d.The mechanical properties results shows that the tensile strengt decrease rate were 16.30%、2.69% and 2.28% after immersed in 5％H2SO4、5％NaOH and 3.5％NaCl for 60d. Qtech-116 polyurea sample hardness showns declined 0.83%、no change and increased 35.81% respectively afte

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12

Kovač Kralj, Anita, and Davorin Kralj. "Parameters Influences during Biodiesel Production." Applied Mechanics and Materials 44-47 (December 2010): 4167–75. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.4167.

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Bio-diesel is a clean burning alternative fuel, produced from domestic, renewable resources. Bio-diesel can be blended at any level with petroleum diesel to create a bio-diesel blend. It can be used in compression-ignition (diesel) engines with little or no modification. Bio-diesel is simple to use, biodegradable, non-toxic, and essentially free of sulphur and aromatics. This paper presents the two following identifiable topic areas as key themes: 1. preparation of an aqueous solution of sodium hydroxide – as a catalyst, which can be activated by the most MeO- active groups, and can therefore

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13

Wang, D., M. Maubert, G. A. Pope, et al. "Reduction of Surfactant Retention in Limestones Using Sodium Hydroxide." SPE Journal 24, no. 01 (2018): 92–115. http://dx.doi.org/10.2118/194009-pa.

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Summary Geochemical modeling was used to design and conduct a series of alkaline/surfactant/polymer (ASP) coreflood experiments to measure the surfactant retention in limestone cores using sodium hydroxide (NaOH) as the alkali. Surfactant/polymer (SP) coreflood experiments were conducted under the same conditions for comparison. NaOH has been used for ASP floods of sandstones, but these are the first experiments to test it for ASP floods of limestones. Two studies performed under different reservoir conditions showed that NaOH significantly reduced the surfactant retention in Indiana Limestone

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14

DAS, N., S. K. BOSE, and R. C. FRANCIS. "Kraft pulp bleaching with a P-stage catalyzed by both bicarbonate and TAED." July 2019 18, no. 7 (2019): 409–14. http://dx.doi.org/10.32964/tj18.7.409.

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Peroxide bleaching of softwood and hardwood (eucalypt) kraft pulps was performed in solutions of sodium bicarbonate (NaHCO3), sodium carbonate (Na2CO3), and sodium hydroxide (NaOH). The conventional P stage (hydrogen peroxide + sodium hydroxide; H2O2 + NaOH) was the most effective brightening system without an additional activator. However, peroxide activation by bicarbonate anion (HCO3–) was obvious in all cases where NaHCO3 or Na2CO3 was used. When N,N,N’,N’-tetraacetylethylenediamine (TAED) was added to the bleaching system, Na2CO3 as the alkali source afforded equal or slightly higher blea

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15

Atabey, İsmail İsa, Okan Karahan, Cahit Bilim, and Cengiz Duran Atiş. "Very high strength Na2SiO3 and NaOH activated fly ash based geopolymer mortar." Cement Wapno Beton 25, no. 4 (2020): 292–305. http://dx.doi.org/10.32047/cwb.2020.25.4.4.

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The paper presents the results of research of high-strength geo-polymer mortars, prepared from two types of siliceous fly ash. Sodium hydroxide and mixtures of sodium hydroxide and sodium silicate in the form of solutions were used as activators. The activator was added in amounts ranging from 6 to 15% NaOH in relation to the ash mass. After preparation, the mortars were cured at the temperature of 60ºC, 80ºC or 100ºC for various times, from 24 hours to 7 days. Increasing the addition of sodium or a higher curing temperature increase the flexural and compressive strength of the tested mortars.

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16

Chang, Qing Hua, Zhen Zhen Chang, Yu Ting Bai, Xiao Yu Chen, and Die Peng. "The Effect of NaOH on the Surface of Magnesium Alloy Ni-B Alloy Plating Properties." Advanced Materials Research 189-193 (February 2011): 347–50. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.347.

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In this paper, the effect of different concentrations of sodium hydroxide on the surface of magnesium alloy plating Ni-B alloys is studied. Focuse on the influence of different NaOH concentrations on electroless plating Ni-B alloy plating rate, coating morphology, and composition. Ascertain the optimal concentration of NaOH. The results showed that when the sodium hydroxide concentration is 50g / L, the deposition rate is the maximum, coating uniformity, structure compact, and boron content in the coating is the maximum.

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17

Muhammad Hayyu ‘Alam. "Pengaruh Perbandingan Na2SiO3 dan NaOH (0,5-1,5) pada Kadar Aktivator 0,43 terhadap Toughness Beton Geopolimer." Konstruksi: Publikasi Ilmu Teknik, Perencanaan Tata Ruang dan Teknik Sipil 2, no. 4 (2024): 193–99. http://dx.doi.org/10.61132/konstruksi.v2i4.551.

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Concrete typically consists of coarse aggregate, fine aggregate, cement, and water. However, cement production generates significant carbon dioxide emissions nearly equivalent to the tons of cement produced. One alternative to conventional concrete, which replaces cement as a binder, is geopolymer concrete. Geopolymer concrete utilizes fly ash or other materials containing silica and alumina as the binder. Unlike cement, which forms a binder through hydration, geopolymer concrete uses a chemical reaction with alkali activators such as Na2SiO3 (sodium silicate) and NaOH (sodium hydroxide). This

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18

Guo, Tian Xiang, Yi Zhao, Shuang Chen Ma, and Song Tao Liu. "Decomposition Characteristics of Hydrogen Peroxide in Sodium Hydroxide Solution." Advanced Materials Research 610-613 (December 2012): 359–62. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.359.

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In order to spread more applications, decomposition characteristics of hydrogen peroxide (H2O2) in sodium hydroxide (NaOH) solution were investigated in this paper. Research results indicate that the attack of charged particles such as OH- and HO2- leads to H2O2 decomposition. HO2¬- is vital reactive intermediate, which was mainly from neutral reaction of H2O2 with NaOH. The decomposition is considered as pseudo-two-order kinetics, and the reaction rate constant depended on decomposition temperature and solution pH. The apparent average activation energy is 51.92 kJ•mol-1 when the initial NaOH

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19

Xue, Zhen Hua, Yun Huan Xie, and Hong Zhi Zhu. "The Effect of Alkali Treatment on Wood Crystalline Structure and Micro-Structural Model." Applied Mechanics and Materials 423-426 (September 2013): 1339–43. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.1339.

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The penetrability of wood can be improved by alkali treatment. In this study, Chinese fir (Cunninghamia lanceolata(Lamb.)Hook) was treated by sodium hydroxide (NaOH) and sodium hydroxide-ultrasonic (NaOH/US). The NaOH solution was 3%, the impregnation time was 48h and the ultrasonic treatment time was 30min. The crystalline region of the pretreated samples was analyzed using X-ray diffraction (XRD), and the results showed that the diffractive peak of 002 crystal faces was lower and crystallinity decreased after the alkali treatment. It proved that some boding of crystalline region was cut off

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20

Shahid, Mursaleen, Alexandre Pierre, Annelise Cousture, and Vincenzo M. Sglavo. "Selective Alkali Activation of Limestone for Additive Manufacturing in Construction: Influence of Alkali Concentration on Physical and Mechanical Properties." Applied Sciences 15, no. 8 (2025): 4453. https://doi.org/10.3390/app15084453.

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Alkali-activated binders are gaining importance in the construction industry because of their environmental and mechanical advantages. This paper focuses on selective limestone activation (SLA) using aqueous sodium hydroxide solutions to be used as a non-hydraulic binder material. This study investigates the mechanical performance of 3D-printed specimens cured at 45 °C produced with different NaOH concentrations. Varying the NaOH concentration is significant for analyzing its role in optimizing the reactivity and mechanical behavior for additive manufacturing applications. The results show tha

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21

Kamhangrittirong, Parames, Prasert Suwanvitaya, Watcharin Witayakul, Patcharaporn Suwanvitaya, and Prinya Chindaprasirt. "Factors Influence on Shrinkage of High Calcium Fly Ash Geopolymer Paste." Advanced Materials Research 610-613 (December 2012): 2275–81. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.2275.

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This research shows the progress of geopolymer synthesis based on high calcium fly ash. In this study, the fly ash contents of 60, 65, and 70 percents by weight and sodium hydroxide solution concentrations of 8 to 12 M were used. Alkali activators for the geopolymer synthesis consisted of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) and the weight ratio of Na2SiO3 to NaOH were 0.50, 1.00, and 1.50. Drying shrinkage deformation of geopolymer paste was investigated by longitudinal measurement in a room temperature. Generally, the drying shrinkage behavior could be divided into three gro

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22

Qin, Lin Bo, Jun Han, Tie Mi, Long Liu, Hao Wang, and Xiu Lin Yang. "Experimental Study on SO₂ and NO_x Removal during Briquette Combustion." Advanced Materials Research 634-638 (January 2013): 741–45. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.741.

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In this paper, the desulphurization of coals prepared briquettes using lime based products (calcium hydroxide and calcium carbonate) and sodium hydroxide as desulphurizing agents (DSA) was investigated in a vertically integrated experimental furnace. Meanwhile, the effect of sodium hydroxide on the denitrification was also studied. The results indicated that calcium carbonate as a DSA is more efficient for SO2 removal during the char combustion, whereas hydrated lime and NaOH are efficient in both char and volatile combustion. For most of the coals, the desulfurization efficiencies in case of

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23

SINGH, DIVYANSHU. "Fly Ash-Based Geopolymer Concrete." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 06 (2024): 1–5. http://dx.doi.org/10.55041/ijsrem35492.

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This paper investigates the properties and applications of fly ash-based geopolymer concrete (GPC) using sodium hydroxide (NaOH), sodium silicate (Na2SiO3), and coarse and fine aggregates. The focus is on understanding the chemical interactions, mechanical properties, and durability of this sustainable construction material. Additionally, results from a rebound hammer test are discussed to evaluate the in-situ strength over time. Keywords : - Fly Ash, Geopolymer Concrete, Sodium Silicate, Sodium Hydroxide, Sustainable Construction, Mechanical Properties, Durability

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24

Lü, Hui, and Derek G. Leaist. "Thermal diffusion with hydrolysis in aqueous solutions of sodium carbonate." Canadian Journal of Chemistry 69, no. 10 (1991): 1584–88. http://dx.doi.org/10.1139/v91-233.

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A conductimetric technique is used to measure thermal diffusion in aqueous solutions of sodium carbonate. In dilute solutions hydrolysis produces significant amounts of sodium bicarbonate and sodium hydroxide: Na2CO3 + H2O = NaHCO3 + NaOH. The applied temperature gradient causes the various solutes to migrate to the cooler parts of the solution. NaOH is found to diffuse more rapidly than NaHCO3, leading to the accumulation of excess NaOH (relative to NaHCO3) at the cold plate. Binary Na2CO3(m) + H2O mixtures therefore separate into ternary Na2CO3(m1) + NaOH(m2) + H2O mixtures under nonisotherm

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Gets, K. V., R. K. Zhdanov, Yu Yu Bozhko, and V. R. Belosludov. "Thermodynamic properties of propane and methane hydrates doped with sodium hydroxide." Journal of Physics: Conference Series 2057, no. 1 (2021): 012075. http://dx.doi.org/10.1088/1742-6596/2057/1/012075.

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Abstract Pure and sodium hydroxide doped with single-component hydrates of methane and propane are studied using molecular and lattice dynamics methods. Vibration density of states and the dependence of Helmholtz free energy on temperature and cell volume are calculated. Dynamic stability of empty and filled by gas sI and sII structures doped with 1 or 2 NaOH molecule is shown in the wide range of temperature values. Comparison of free energy values allows calculating the thermal expansion coefficient and demonstrating the possibility of self-preservation effect in NaOH-doped methane and propa

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Amm, D. T., S. L. Segel, T. J. Bastow, and K. R. Jeffrey. "Deuterium and Sodium Quadrupole Interactions in Sodium Hydroxide. The Monoclinic Phase." Zeitschrift für Naturforschung A 41, no. 1-2 (1986): 305–10. http://dx.doi.org/10.1515/zna-1986-1-256.

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The temperature dependence of the 23NaOH Pure Quadrupole Resonance Frequency has been studied from 77 K to 550 K and shows a change in slope and a discontinuous change in frequency of 6 ± 2 kHz at the orthorhombic to monoclinic phase transition at 505 K At 292 K the 23Na NQR frequency is 1.778 ± 0.001 MHz, η < 0 .04. The temperature dependence of the deuterium quadrupole coupling was fit to a librating molecule model between 293 K and 570 K (QCC = 245 ± 2 kHz, η = 0.05 ± 0 .0 1 at 293 K) and confirms that the frequency of the libration decreases in the high temperature monoclinic phase. X-r

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27

Graham, Trent R., Mateusz Dembowski, Hsiu-Wen Wang, et al. "Hydroxide promotes ion pairing in the NaNO2–NaOH–H2O system." Physical Chemistry Chemical Physics 23, no. 1 (2021): 112–22. http://dx.doi.org/10.1039/d0cp04799f.

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Wang, Wen Bo, Fan Gong Kong, Shou Juan Wang, Ya Jie Zhong, and Gui Hua Yang. "Using of Magnesium Hydroxide and Sodium Hydroxide in DP Beaching of NaOH-AQ Wheat Straw Pulp." Advanced Materials Research 690-693 (May 2013): 1455–60. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.1455.

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Sodium hydroxide (NaOH) substituted by magnesium hydroxide (Mg(OH)2) as control agent and alkali source were investigated in chlorine dioxide bleaching and hydrogen peroxide bleaching of NaOH-AQ wheat straw pulp. The effects of alkali sources on pulp properties, including brightness and tensile strength, were investigated. The four experimental groups, including DNaOHPNaOH, DNaOHPMg(OH)2, D Mg(OH)2PNaOH and DMg(OH)2PMg(OH)2, were studied in this paper. The results showed that the brightness and tensile strength of DMg(OH)2PMg(OH)2 pulp was slightly lower than that of DNaOHPNaOH pulp. But there

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29

Herwani, Ivindra Pane, Iswandi Imran, and Bambang Budiono. "Compressive Strength of Fly ash-based Geopolymer Concrete with a Variable of Sodium Hydroxide (NaOH) Solution Molarity." MATEC Web of Conferences 147 (2018): 01004. http://dx.doi.org/10.1051/matecconf/201814701004.

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Geopolymer concrete is a new material made by activating the raw materials which contain many elements of silica and alumina. Compressive strength of geopolymer concrete produced was influenced by the concentration of the activator solution. This paper presents an experimental investigation into fly ash-based geopolymer concrete. Research objective was to investigate the effects of alkaline activator solution (AAS) molarity on compressive strength of geopolymer concrete. Variable of the test were a solution to sodium hydroxide was chosen as the activator solution. Concentration of sodium hydro

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30

Peters, Gretchen Marie, Xiaodong Chi, Chandler Brockman, and Jonathan L. Sessler. "Polyvinyl alcohol–boronate gel for sodium hydroxide extraction." Chemical Communications 54, no. 43 (2018): 5407–9. http://dx.doi.org/10.1039/c8cc02610f.

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Zhang, Xianmei, Zhenquan He, Wei Jia, et al. "Mechanism of Potassium Release from Feldspar by Mechanical Activation in Presence of Additives at Ordinary Temperatures." Materials 17, no. 1 (2023): 144. http://dx.doi.org/10.3390/ma17010144.

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To improve the potassium availability of feldspar at ordinary temperatures, the mechanical grinding and addition of sodium hydroxide/salts were employed to study the effects of mechanical activation and strong alkali addition on particle characteristics, water-soluble potassium, and the available potassium of feldspar. A laser particle size analyzer was utilized for the direct determination of particle size distribution (PSD) using ground samples. The Brunauer–Emmett–Teller (BET) method was employed for specific surface areas. X-ray diffraction (XRD) was employed for structural characterizatio

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Kennedy, S., and D. A. Rice. "Renal Lesions in Cattle Fed Sodium Hydroxide-treated Barley." Veterinary Pathology 24, no. 3 (1987): 265–71. http://dx.doi.org/10.1177/030098588702400311.

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Ten 14-week-old calves were fed a diet containing 87.5% NaOH-treated barley, and killed after 29, 65, 71, 117, 140, 179, 314, 338, and 408 days. Eight control calves were fed a diet in which untreated rolled barley was substituted for alkali-treated grain. Calves receiving NaOH-treated barley became polyuric with urine pH ranging from 9.0 to 9.5, and had significantly raised plasma creatinine levels on day 29. Other clinical findings were normal, and there were no other significant alterations in blood. At necropsy, bilateral renal lesions consisted of white cortical foci, medullary stippling,

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Moreno-Piraján, J. C., and L. Giraldo. "Study of Activated Carbons by Pyrolysis of Mangifera Indica Seed (Mango) in Presence of Sodium and Potassium Hydroxide." E-Journal of Chemistry 9, no. 2 (2012): 780–85. http://dx.doi.org/10.1155/2012/909747.

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Activated carbons (ACs) were prepared by pyrolysis of seeds mango in presence of sodium and potassium hydroxide (chemical activities). Seeds mango from Colombian Mango cultives were impregnated with aqueous solutions of NaOH and KOH following a variant of the incipient wetness method. Different concentrations were used to produce impregnation ratios of 3:1 (weight terms). Activation was carried out under argon flow by heating to 823 K with 1 h soaking time. The porous texture of the obtained ACs was characterized by physical adsorptions of N2at 77 K and CO2at 273 K. The impregnation ration and

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Mohamad, Habib Musa, Mohd Fahmie Izzudin Sharudin, Adriana Erica Amaludin, and Siti Nor Farhana Zakaria. "Characteristic and Physicochemical Properties of Peat Soil Stabilized with Sodium Hydroxide (NaOH)." Civil Engineering Journal 9, no. 9 (2023): 2221–32. http://dx.doi.org/10.28991/cej-2023-09-09-09.

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Peat in various phases of decomposition has poor shear strength and high compressive deformation. For this research study, it will focus on stabilizing peat soil using NaOH. There are two main tests that were conducted in this research study, which are index property testing and the compaction test. For index property testing, there were six (6) experiments conducted to study the index properties of disturbed peat soil, which are moisture content, fiber content, organic content, liquid limit, pH, and specific gravity. Then, for the compaction test, a 4.5kg rammer was used to determine the best

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MAKARATAT, Nattapong, Sumrerng RUKZON, and Prinya CHINDAPRASIRT. "Effects of delay time and curing temperature on compressive strength and porosity of ground bottom ash geopolymer mortar." Journal of Metals, Materials and Minerals 31, no. 3 (2021): 134–42. http://dx.doi.org/10.55713/jmmm.v31i3.1186.

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This research investigated development of ground bottom ash (GBA) for a new geopolymer material. The compressive strength and porosity of the geopolymer mortar containing GBA were tested. The GBA-based geopolymer mortar mixtures were designed by control liquid to GBA ratio for all tests. Extra water was also used to maintain the workability of geopolymer mortar. The sodium hydroxide (NaOH) concentrations of 10 M and 15 M were used. Furthermore, sodium silicate (Na2SiO3) to sodium hydroxide (NaOH) ratios by mass such as 0.50, 1.50 and 2.50 were also used as alkali activator solutions. Effects o

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Baby, Bukke, M. Murali, and B. Venkata Sindhuri. "An Experimental Investigation on Geopolymer Bricks Using Quarry Dust as Fine Aggregate." Advanced Materials Research 1182 (December 30, 2024): 73–80. https://doi.org/10.4028/p-mjq7yt.

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Environmental pollution in the construction industry is mostly caused by the manufacture of Portland cement, which releases pollutants like CO2. In this study, geopolymer bricks constructed with fly ash, GGBS, and quarry dust as fine aggregates have undergone experimental work. An activator used in the mixture of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) is also used. For each combination, the molarity of sodium hydroxide was kept constant at 1M, while the ratios of sodium silicate to sodium hydroxide solution varied between 0.25, 0.5, and 1. Brick samples of 230 mm by 110 mm by 70

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Qian, Cheng, Xing Yong Liu, Shi Xiong Hao, Ting Ting Tang, Ya Jing Lan, and Shuang Luo. "Study on the Control of Super-Fine Aluminum Hydroxide Particle Size from Sodium Aluminate Solutions." Advanced Materials Research 750-752 (August 2013): 1754–57. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.1754.

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The super-fine aluminum hydroxide was prepared by crystal seed precipitation from sodium aluminate solutions in this study. The influence of NaOH concentration, [NaO/[Al (OH)3] molar ratio, precipitation temperature, and precipitation time on the particle size of super-fine aluminum hydroxide was investigated. The results show that the optimum conditions were: NaOH concentration be 180 g/L, [NaO/[Al (OH)3] molar ratio be 1.15, precipitation temperature be 40°C, and precipitation time be 26 h.

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Zhang, Jin Xia, Shu Xian Liu, and Jun Xie. "Study of Manufacture Process and Properties of Tailings and Slag Based Mine Filling Cementitious Materials." Advanced Materials Research 734-737 (August 2013): 1077–81. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.1077.

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The tailings and slag based mine filling cementitious materials was prepared by sodium silicate and sodium hydroxide alkali-activated tailings and slag. Through the test that the cementing materials in the best ratio of raw materials: when slag and tailings admixture is 1.25, the content of NaOH was 50%, the amount of sodium hydroxide for 50%, water cement ratio of 0.22, under the condition of normal temperature curing 7 days, eventually making a compressive strength of 52.3MPa cementing materials.

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Otitigbe, F. E. "Evaluation of pH of Drilling Fluid Produced from Local Clay and Additives." Journal of Applied Sciences and Environmental Management 25, no. 4 (2021): 561–66. http://dx.doi.org/10.4314/jasem.v25i4.11.

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Maintaining the pH of drilling fluid with suitable additives is one of the important operation for efficient drilling operations. However, commercial hydroxides are mostly used to control the pH of the drilling fluid. This paper evaluates locally sourced pH additives of burnt plantain heads (BPH), burnt ripe burnt ripe plantain peels (BRPP), and burnt banana plantain peels (BBPP) in comparison with conventional potassium hydroxide (KOH) and sodium hydroxide (NaOH) as suitable agents to control pH of drilling fluid. The drilling fluid as prepared with bentonite and local clay in different conce

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Tjahjaningsih, W., P. S. P. Pitutur, Patmawati, et al. "Effect of NaOH-based deproteinisation on chemical and biological properties of Moina sp. chitosan." Food Research 7, Supplementary 4 (2023): 1–9. http://dx.doi.org/10.26656/fr.2017.7(s4).1.

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Chitosan is a biopolymer which is isolated from the crustacean exoskeleton of Moina sp. with particular antibacterial properties. Alkali-sodium hydroxide deproteinisation has a huge role in ensuring the chitosan quality by removing protein to enhance its dispersivity. Modification of sodium hydroxide (NaOH) concentration by 3N and 6N was performed in this study to observe the effect on chemical and biological characteristics of chitosan. The highest concentration treatment of 6N NaOH exhibited the best composition of protein, fat, and ash by 6.09%, 3.77% and 0.9%, respectively. The deacetylati

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Zhou, Feng, Kai Li, Fangxue Hang, et al. "Efficient removal of methylene blue by activated hydrochar prepared by hydrothermal carbonization and NaOH activation of sugarcane bagasse and phosphoric acid." RSC Advances 12, no. 3 (2022): 1885–96. http://dx.doi.org/10.1039/d1ra08325b.

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Naufal, Muhammad, Syahrul Sariman, and Eka Yuniarto. "Efektivitas Aktivator Alkali Potassium Hidroksida Dan Abu Sekam Padi Terhadap Kuat Tekan Beton Geopolimer." Jurnal Penelitian Teknik Sipil Konsolidasi 2, no. 2 (2024): 153–58. https://doi.org/10.56326/jptsk.v2i2.3205.

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Geopolymer concrete is a concrete product whose binding reaction is a polymerization reaction. In this reaction Aliminium (Al) and Silica (Si) have an important role because Aluminum and Silica will produce AlO2 and SiO4. The alkaline activators used are Sodium Hydroxide (NaOH), Potassium Hydroxide (KOH) and Sodium Silicate (Na2SiO3). Constituent material on. Geopolymer concrete consists of coarse aggregate, fine aggregate and water. NaOH is dissolved with distilled water, then mixed with Na2SiO3. In the research process using the curing method by wrapping for 28 days. The compressive strength

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Purnamayati, L/, W. Istianisa, Sumardianto, and S. Suharto. "Refining of tilapia (Oreochromis niloticus) viscera oil with different sodium hydroxide concentrations." Food Research 7, no. 4 (2023): 106–13. http://dx.doi.org/10.26656/fr.2017.7(4).816.

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Crude fish oil cannot be applied to various products or consumed because its characteristics did not meet the food safety standards. Thus, it needs a purification process using NaOH to reduce the value of free fatty acids. This study was performed to determine the effect of NaOH on the characteristics of Tilapia’s viscera oil and to determine the best concentration. This study was an experimental laboratory using the Completely Randomized Design with different concentrations of NaOH 1%, 2% and 3% with triplication. Parametric data were analyzed by ANOVA followed by HSD, while nonparametric dat

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Tan, Kwok Joon, Hasan Zuhudi Abdullah, Maizlinda Izwana Idris, and Charles C. Sorrell. "Gel Oxidation of Titanium at Low Concentration of Sodium Hydroxide (NaOH)." Advanced Materials Research 1087 (February 2015): 340–44. http://dx.doi.org/10.4028/www.scientific.net/amr.1087.340.

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Gel oxidation is an effective thermochemical method for the preparation of bioactive titanium surfaces. This study aims to investigate the effect of low concentration of NaOH on gel oxidation of titanium when subjected to various temperatures. Titanium foils were soaked in NaOH aqueous solutions with the concentration of 0.5 M or 1.0 M, followed by oxidation in the range of 400°C to 800°C. The crystallinity of the film was determined using glancing angle X-ray diffraction (GAXRD). The microstructures were examined using field emission scanning electron microscope (FESEM). Focused ion beam mill

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Mohammed, Asem Hassan. "Studying the Improvement of the Solubility of Cellulosic Fibers." Journal of Engineering 22, no. 7 (2017): 21–37. http://dx.doi.org/10.31026/j.eng.2016.07.13.

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This study focuses for improving the increase the solubility of fiber cellulose in sodium hydroxide solution in concentrations ranging from (4- 12%), from one point of view and from other point of view in (sodium hydroxide and urea) solution concentration (6% NaOH + 4% urea), under low temperature (- 15, - 20 Co) , depending on the principle of reducing the degree of polymerization for fiber cellulose, which is represented in our tests cotton linter who its represent (Whatman filter paper, Grade 1), some samples subjected to chemical pretreatment as simulation the method of decomposition of ce

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He, Bing-Xuan, Yong Liang, Ze-Kun Fan, Lue-Wei Xu, De-Gang Liu, and Guo-Zuan Xu. "Dissolution Behavior of Sodium Phosphate in a Na3PO4–Na2WO4–NaOH Solution System." Minerals 12, no. 6 (2022): 732. http://dx.doi.org/10.3390/min12060732.

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Sodium hydroxide autoclaving is the main method for smelting scheelite in China. In this method, sodium phosphate is added as an additive to realize the highly efficient decomposition of scheelite, and a crude sodium tungstate solution containing sodium phosphate and sodium hydroxide is obtained. In the subsequent process of ion exchange, phosphorus ions in the solution compete with the resin adsorption of tungstate, which reduces the adsorption capacity of the resin and endangers the purity of the subsequent sodium tungstate solution. To remove the phosphorus from crude sodium tungstate solut

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Nurwidayati, Ratni, Intan Saniah, Nursiah Chairunnisa, and Ade Yuniati Pratiwi. "The Effect of Bottom Ash as Partial Replacement of Fine Aggregate in Different NaOH Molarities on the Compressive Strength of Geopolymer Mortar." E3S Web of Conferences 476 (2024): 01031. http://dx.doi.org/10.1051/e3sconf/202447601031.

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This study compared the compressive strength of the geopolymer mortar with different percentages of bottom ash as a replacement for fine aggregate. Fly ash from two sources was blended as raw materials. Sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) were used as alkaline solutions, with a ratio of 2.5 and two NaOH concentrations of 8M and 10M. The percentage of bottom ash was substituted up to 30%. The result indicated that the setting time was longer due to the higher molarity of NaOH. The compressive strength of mortar geopolymer at 10M of NaOH was higher than 8M. Higher percentages o

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Fadilah, Fadilah, Shidiq Trianto, and Tri Nova Prakoso. "Glucomannan sponges: Effect of different amount of SLS and Sodium Hydroxide." Equilibrium Journal of Chemical Engineering 3, no. 1 (2019): 15. http://dx.doi.org/10.20961/equilibrium.v3i1.42757.

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<p><strong>Abstract.</strong> An attempt to increase the economic value of porang flour was made by utilizing it for making of sponge. The sponge was made by direct foaming of glucomannan solution with the addition of SLS and NaOH. Dried sponge were obtained through freezing-thawing process followed by drying. The effect of amount of SLS and NaOH were investigated. It was found that increasing amount of SLS and NaOH made the cell size of the sponge smaller. While there was no tendency for swelling degree accordance to the various amount of SLS, the increasing amount of NaOH c

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Anggono, Juliana, Hariyati Purwaningsih, Suwandi Sugondo, Steven Henrico, Sanjaya Sewucipto, and Jay Patel. "Structural Evaluation on Sugarcane Bagasse Treated Using Sodium and Calcium Hydroxide." E3S Web of Conferences 130 (2019): 01018. http://dx.doi.org/10.1051/e3sconf/201913001018.

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Greater interest in recent years to the increase demand in using natural fiber reinforcement of polymers is to comply with the increasing stringent international protocols related to climate change and environmental awareness. Many studies have reported the development of renewable and biodegradable agricultural by-products as reinforcement fibers for biocomposites. One of the essential factors in producing strong biocomposites is the properties prepared from the natural fibers which results from the alkalitreatment given. This research aims to evaluate the effect of different treatment durati

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Fatimah, Soja Siti, Wiwi Siswaningsih, Ali Kusrijadi, and Fikri Aziz Shalahuddin. "Silver Recovery from X-ray Film Waste by Leaching and Precipitation Method Using Sodium Hydroxide and Sodium Sulfide." Jurnal Kimia Valensi 6, no. 1 (2020): 62–69. http://dx.doi.org/10.15408/jkv.v6i1.13648.

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Silver recovery research from x-ray film waste by leaching and precipitation method using NaOH and Na2S aims to determine the optimum conditions in silver recovery. The parameters optimated in this study were the concentration of the precipitants, leaching temperature and the effect of the type of precipitants on the precipitated time. The results showed that the NaOH and Na2S precipitants were able to recover silver optimally at a concentration of 1.5 M. The optimum leaching temperature of the film with the Na2S precipitant to recover silver was at 25oC, whereas in the NaOH precipitant the fi

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