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Journal articles on the topic 'Silica sulphuric acid'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Li, Hong Fang, Li Guo, and Yi Xia. "Acid Rain Erosion Resistance of Concretes Containing Super-Fine Mineral Admixtures." Applied Mechanics and Materials 174-177 (May 2012): 1402–5. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1402.

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The sulphuric acid erosion resistance of high strength concretes containing limestone powder,titanium slag and silica ash were studied by accelerating cycle sulphuric acid soak tests. It indicates that the introduction of super-fine mineral powders into concrete can improve its sulphuric acid erosion resistance. With fixed 10% limestone powder, blending 10% titanium slag or 15% silica ash can remarkably enhance sulphuric acid erosion resistance of concrete. The concretes containing mineral admixtures such as limestone powder, titanium slag and silica ash can be used in acid rain abundant area.

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2

Sáenz, María Carolina, Carlos Andrés Báez Quintero, José de Jesús Díaz Velásquez, and Gerardo Rodríguez Niño. "Reaction parameter study for the chemical synthesis of adsorbent silica gel." Ingeniería e Investigación 27, no. 2 (2007): 44–50. http://dx.doi.org/10.15446/ing.investig.v27n2.14828.

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This article presents an appropriate set of reaction parameters (reaction temperature, sulphuric acid and sodium silicate reagent concentration) for obtaining adsorbent silica gel (ASG) using Colombian-produced raw materials. The core of ASG synthesis lies in sulphuric acid’s neutralisation reaction with sodium silicate. Their effect on final ASG moisture adsorption capacity was measured after changing such synthesis’ above-mentioned reaction parameters. Within the range of conditions studied, it was found that the highest adsorption capacity occurred by combining both low sodium silicate conc

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3

Silin, Ivan, Christian Dertmann, Vesna S. Cvetković, Srecko Stopic, and Bernd Friedrich. "Prevention of Silica Gel Formation for Eudialyte Study Using New Digestion Reactor." Minerals 14, no. 2 (2024): 124. http://dx.doi.org/10.3390/min14020124.

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This work includes a combined hydrometallurgical treatment of a eudialyte ore sample with a subsequent preparation of leaching residue using mechanical separation methods. Hydrometallurgical treatment contains dry digestion with sulphuric acid at room temperature and filtration of the obtained product. The objectives of adopting these procedures are to test a new digestion reactor in order to prevent silica gel formation from the eudialyte ore. The obtained results revealed that silica gel formation is prevented during dissolution with sulphuric acid. A high leaching efficiency of light rare e

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4

Bawa, SG, AS Ahmed, PC Okonkwo, and SM Waziri. "DEVELOPMEMT OF PILOT SCALE DEALUMINATION UNIT OF 2.5 kg METAKAOLIN PER BATCH CAPACITY." Nigerian Journal of Technology 36, no. 3 (2017): 829–34. http://dx.doi.org/10.4314/njt.v36i3.24.

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A pilot-size dealumination unit to handle 2.5kg of metakaolin per batch was designed and fabricated and test run. The metakaolin was prepared from Kankara kaolin. The metakaolin was completely split into silica and alumina. The silica component which was inert to the sulphuric acid used during the reaction and was obtained as a solid product. While the alumina which reacted with the sulphuric acid was obtained in liquid form as aluminum sulphate, known as alum. The dealumination unit comprises of the dealumination reactor, known as dealuminator, acid holding tank and metakaolin slurry mixing t

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5

Pinzari, Flavia, and Javier Cuadros. "Unusual Perforations in Phlogopite Crystals from Caldara di Manziana (Italy) Caused by Sulphuric Acid Generated by Microbial Oxidation of H2S Emanations." Minerals 11, no. 5 (2021): 547. http://dx.doi.org/10.3390/min11050547.

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Phlogopite flakes strewn on the soil of Caldara di Manziana (Italy) display multiple minute perforations. The site is a caldera linked to recent volcanism (90 ka to 0.8 Ma) with present emanations of CO2 (~150 t d−1) and H2S (~2.55 t d−1). Stereomicroscopy and SEM–EDX observation of the phlogopite crystals shows holes and depressions <200 µm to 2 mm across. They are circular, pseudo-hexagonal, or irregular. Within the depressions, there are deposits of phlogopite alteration products consistent with a sulphuric acid attack, showing loss of Mg and K. Some are thin and homogeneous; others are

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6

Faizul, Che Pa, C. Abdullah, and B. Fazlul. "Review of Extraction of Silica from Agricultural Wastes Using Acid Leaching Treatment." Advanced Materials Research 626 (December 2012): 997–1000. http://dx.doi.org/10.4028/www.scientific.net/amr.626.997.

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Large quantities of agricultural wastes such as palm ash and rice husk are found in Malaysia, have a large possibility to be employed as usefully renewable to produce energy and silica (SiO2). Extensive researches have been carried out to extract silica from agricultural wastes such rice husk, because silica is useful raw material for industrial application. In the previous studies, the strong acid leaching treatment was carried out on rice husk to remove metallic impurities and organics contained in them. Leaching treatment is a proper route to extract the silica. Sulphuric acid (H2SO4), hydr

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7

Thirunarayanan, G., and G. Vanangamudi. "Synthesis of Some Aryl Chalcones Using Silica-Sulphuric Acid Reagent under Solvent Free Conditions." E-Journal of Chemistry 4, no. 1 (2007): 90–96. http://dx.doi.org/10.1155/2007/421435.

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There are two series of α, β-unsaturated ketones derived form Biphenyl and 9H-Fluorenyl, and ketones with various substituted benzaldehydes under solvent free conditions using silica-sulphuric acid as a reagent in an oven. The catalyst silica is reusable and the yields of chalcones are more than 90%. These chalcones are characterized by physical constants and spectral data.

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8

da Silva, Carolina Nogueira, Liliani Pacheco Tavares Nazareth, Mônica Elizetti de Freitas, and Ana Claudia Queiroz Ladeira. "Sulphuric Acid Digestion of Anatase Concentrate." Mining 4, no. 1 (2024): 79–90. http://dx.doi.org/10.3390/mining4010006.

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The processing of anatase ores by sulphuric acid digestion is well known for its low titanium dissolution yields, which makes the process economically and technically unfeasible. Anatase is considered much less reactive than other forms of titanium such as ilmenite and rutile. Generally, to enhance its dissolution, thermal processes along with acid and/or alkaline leaching processes are necessary. Studies of direct sulphuric acid digestion are few and the reported yields of titanium dissolution are <48%. This study investigated the main parameters of sulphuric digestion of anatase such as t

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9

Faizul, Che Pa, C. Abdullah, and B. Fazlul. "Extraction of Silica from Palm Ash Using Citric Acid Leaching Treatment: Preliminary Result." Advanced Materials Research 795 (September 2013): 701–6. http://dx.doi.org/10.4028/www.scientific.net/amr.795.701.

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Large quantities of agricultural wastes such as palm ash and rice husk are found throughout Malaysia, have a possibility to be used as a usefully renewable source for production of energy and silica (SiO2). Extensive researches have been carried out to extract silica from agricultural wastes such as rice husk, due to silica as a useful raw material for industrial application. In the previous studies, the strong acid leaching treatment was carried out to remove metallic impurities and organics contained in rice husk. Since leaching treatment is a proper route to extract the silica, sulphuric ac

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10

Filipovic, Radislav, Dragica Lazic, Mitar Perusic, and Ivan Stijepovic. "Oil absorption in mesoporous silica particles." Processing and Application of Ceramics 4, no. 4 (2010): 265–69. http://dx.doi.org/10.2298/pac1004265f.

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Mesoporous silica particles were prepared from highly basic sodium silicate solutions, having different silica modulus and SiO2 concentrations, by adding sulphuric acid at different temperatures. Pore structure of prepared silica particles (aggregates) is strongly influenced by processing conditions and easy controllable in broad range of the specific surface area, pore size, pore volume and size distribution. It is shown that there is a clear correlation between volume of absorbed oil and processing parameters used in preparation of silica aggregates. Thus, oil absorption is higher in the sam

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11

Rodgers, K. A., K. L. Cook, P. R. L. Browne, and K. A. Campbell. "The mineralogy, texture and significance of silica derived from alteration by steam condensate in three New Zealand geothermal fields." Clay Minerals 37, no. 2 (2002): 299–322. http://dx.doi.org/10.1180/0009855023720035.

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AbstractOpaline silica residue accumulates on the surface and in the near surface of the Te Kopia, Tikitere and Rotokawa geothermal fields, where rhyolitic tuffs are attacked by steam condensate, made acid (pH 2–3) by sulphuric acid produced by oxidation of H2S that accompanies steam discharge. Silica residue is one product of this alteration process that also yields kaolinite, sulphur, sulphide and aluminous sulphates, including alunite and alunogen, as pH, Eh and available moisture fluctuate across the field surface. Coagulation of colloidal polymeric silica or, possibly, direct deposition o

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12

Rajkumari, Kalyani, Juri Kalita, Diparjun Das, and Lalthazuala Rokhum. "Magnetic Fe3O4@silica sulfuric acid nanoparticles promoted regioselective protection/deprotection of alcohols with dihydropyran under solvent-free conditions." RSC Advances 7, no. 89 (2017): 56559–65. http://dx.doi.org/10.1039/c7ra12458a.

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Protection (and deprotection) of hydroxyl groups via tetrahydropyranylation was carried out effectively using a catalytic amount of Fe<sub>3</sub>O<sub>4</sub> supported silica sulphuric acid nanoparticles (Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@SO<sub>3</sub>H) under solvent-free conditions.

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13

Gupta, A. K., A. K. Chandra, and U. C. Sharma. "Various Pre-Treatment Methods to Reduce Free Fatty Acid Content in Non-Edible Vegetable Oils for Biodiesel Production." Asian Journal of Chemistry 34, no. 11 (2022): 3021–25. http://dx.doi.org/10.14233/ajchem.2022.23954.

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In this work, the efforts were made to reduce high free fatty acid (FFA) content in non-edible karanja and jatropha vegetable oils below 1 mg KOH/g. The process was optimized in terms of amount of sulphuric acid used in pre-treatment of the studied non-edible oils. Various adsorbents like activated carbon, alumina, alumina-silica, calcined alumina and calcined alumina-silica exhibited significant removal of FFA in a single-stage filtration process. Pre-treatment of test oil with calcined alumina-silica as adsorbent was found to be the most appropriate for the removal of free fatty acids. Ultra

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14

Ramya Swetha, R., Dr G.Venkata Ramana, and K. Anusha Hadassa. "Experimental study on concrete with rice husk ash under sulphuric ACID solutions." International Journal of Engineering & Technology 7, no. 4.5 (2018): 522. http://dx.doi.org/10.14419/ijet.v7i4.5.21148.

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This investigation shows the results on aggressive sulphuric acid on the concrete combined with rice husk ash (RH) when partially replaced for ordinary Portland cement. The husk ash, which mainly contains aluminum ion, silica, iron and calcium oxides, is an industrial waste and poses disposal problems. In this study, the effect of various concentrations (1%, 3%, 5%) of sulphuric acid (H2SO4) on Concrete replaced with various percentages (0%,5%,10%,15% and 20% by weight of cement) of RH is evaluated in-terms of residual compressive strength. The loss of compressive strengths of concrete immerse

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15

Freidin, C. "Behaviour of silica-concrete based on quartz bond in sulphuric acid." Cement and Concrete Composites 21, no. 4 (1999): 317–23. http://dx.doi.org/10.1016/s0958-9465(99)00014-1.

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16

Ruben, J. Sahaya. "Concrete Incorporated With Silica Fume And Manufactured Sand Under Acidic Nature." JOURNAL OF ADVANCES IN CHEMISTRY 12, no. 12 (2016): 4611–13. http://dx.doi.org/10.24297/jac.v12i12.4828.

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Now a dayAcid attack is growing threat to concrete structures. Using some alternate materials as partial replacement of cement and sand in the concrete is an important factor that enhances the performance of concrete in an aggressive environment. In this present study, the cement is replaced with silica fume by 10 % and the sand is replaced with manufactured sand up to 50%. The selection of these replacement materials involves a balance between economy and durability.The specimens are immersed in 2% concentration of both acids such as sulphuric acid and hydro chloric acid at 28 days. The grade

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17

Seroka, Ntalane Sello, Raymond T. Taziwa, and Lindiwe Khotseng. "Extraction and Synthesis of Silicon Nanoparticles (SiNPs) from Sugarcane Bagasse Ash: A Mini-Review." Applied Sciences 12, no. 5 (2022): 2310. http://dx.doi.org/10.3390/app12052310.

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This current study reviews the utilization of the traditional extraction methods and latest findings in extraction of silica from agricultural wastes, in particular, sugarcane bagasse, using inorganic acids to produce nano-silicon. The three key processes discussed in detail include electrochemical, ball milling, and sol–gel processes. The sugarcane bagasse has been identified as the cheapest source of producing silica from the potential raw material for the preparation of nano-silicon. The acid-base extraction and precipitation methodology involves the use of bases like sodium hydroxide (NaOH

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18

Hello, Kasim Mohammed, Majid Jari Mohammed, Asstabraq Mohsen Yasser, Farook Adam, and Zinab Farag. "Modification of Silica Rice Husk Ash to Solid Ammonium Sulphate for Second Generation Biofuels Productions." Journal of Catalysts 2014 (December 9, 2014): 1–9. http://dx.doi.org/10.1155/2014/128547.

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A new approach has been demonstrated for the synthesis of solid ammonium sulphate attached to silica rice husk ash. The 3-(aminopropyl)triethoxysilane was immobilized onto silica at room temperature to functionalize the silica with ammine end groups (–NH2). The amine group was sulphated with sulphuric acid to produce a novel micro-rod-like shaped acidic catalyst (as seen with TEM) designated RHNH3SO4H (RH = rice husk). The TGA analysis shows that the catalyst is stable at temperatures below 200°C. The acidity measurement of the catalyst indicates that it has Brønsted acid sites. Cellulose extr

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19

Dolowy, Malgorzata, Alina Pyka-Pajak, Katarzyna Filip та Joanna Zagrodzka. "TLC-densitometric analysis of α-escin in bulk drug substance and in pharmaceutical dosage forms". Current Issues in Pharmacy and Medical Sciences 28, № 3 (2015): 186–91. http://dx.doi.org/10.1515/cipms-2015-0069.

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Abstract A quite simple and rapid TLC-densitometric method for the identification of α-escin (Aescin) in bulk drug substances was developed. In so doing, different chromatographic conditions, including various mobile and stationary phases, were tested. A TLC densitometric determination of the examined compound was performed without using visualizing reagent, yet with the use of appropriate dipping reagents, in order to obtain reliable UV-densitometric measurements of α-escin - a substance which has weak chromophore groups. Herein, the application of a mobile phase containing n-butanolacetic ac

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20

Kurniawansyah, Firman, Amila D. Istiqomah, Aisyah J. Malahayati, Himawan Tri Bayu Murti Petrus, and Achmad Roesyadi. "Utilization of Silica from Indonesian Solid Wastes as Catalyst Materials." Key Engineering Materials 849 (June 2020): 72–77. http://dx.doi.org/10.4028/www.scientific.net/kem.849.72.

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Synthesizing materials can be attempted by utilizing alternative sources such as wastes or disposed/by-products of certain activities. In this article, exploration of silica from agricultural waste and from geothermal sludgefor production of silica catalysts, are presented. The first silica catalyst was synthesized from rice husk. The husk was initially heated until silica ashes could be formed. After immersion in acidic solution, impregnation with nickel and molybdenum were conducted to introduce active metal of nickel (Ni) and molybdenum (Mo) in the support structure. The catalyst formed, Ni

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21

Sun, Li Mei, Jiang Wu, and Shuai Qi Meng. "Soil Washing and Bioremediation of Tailing Dam Wastes." Advanced Materials Research 610-613 (December 2012): 2405–9. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.2405.

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The paper presents that soil washing and bioremediation technologies were employed to treat the contaminated soil. Various works were conduced in parallel with each other and th results of the laboratouy studies were used to determine critical parameters. Four lixiviants, i.e. sulphuric acid, acetic acid, oxalic acid and ethylene diamine acetic acid were tests at three concentration levels respectively. The tests showed that the leaching of the heavy metals increases as the soil porosity increases. Silica sand was added to increase porosity of the contaminated soil. Hightest Mn removal was ach

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22

Eštoková, Adriana, Martina Kovalcikova, and Alena Luptáková. "Deterioration of Cement Composites with Silica Fume Addition due to Chemical and Biogenic Corrosion Processes." Solid State Phenomena 227 (January 2015): 190–93. http://dx.doi.org/10.4028/www.scientific.net/ssp.227.190.

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The paper is aimed at comparative study of resistance of Portland cement composites with addition of silica fume as durability increasing factor in various aggressive environments (sulphuric acid with pH 4, the medium of activated bacteria and the cultivating medium without bacteria) during 150 days under model laboratory conditions. Experimental studies confirmed: the leaching of silicon ions calculated to 1 g of concrete sample affected with bacteriaAcidithiobacillusthiooxidanswas 2.5 times lower (31.78 mg/g of sample) for concrete sample with silica fume addition comparing to concrete sampl

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23

Famodu, Ayomide, Henry Mgbemere, and Eugenia Obidiegwu. "SYNTHESIS AND CHARACTERIZATION OF SILICA PARTICLES FROM YAM AND CASSAVA PERIDERM." Usak University Journal of Engineering Sciences 8, no. 1 (2025): 1–13. https://doi.org/10.47137/uujes.1559944.

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In this study, silica particles were synthesized from periderms of yam and cassava. The synthesis process involved the calcination of both periderms to form their respective ash at 600, 700, 800, and 900oC, followed by purification of the ash with dilute sulphuric acid (H2SO4) and leaching of the ash in NaOH solution to form sodium silicate. The sodium silicate was further titrated with HCl to precipitate silica out in gelatin form. The resulting fine particles were then characterized using X-ray Fluorescence, X-ray diffraction, and Fourier transform infrared spectroscopy. The study showed cas

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24

Manurung, Posman, Erika Sempana Ginting, Ediman Ginting, and Suprihatin -. "Synthesis and Characterisation of Nano-silica Based on Pumice Using NaOH." Journal of Physical Science 33, no. 1 (2022): 17–28. http://dx.doi.org/10.21315/jps2021.33.1.2.

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Nano-silica was synthesised from pumice by extraction method using sodium hydroxide (NaOH), sulphuric acid (H2SO4) and hydrochloric acid (HCl). The raw material of pumice was collected from local area, Tanggamus-Lampung Indonesia. After grinding, the pumice powder was activated at 450°C for 2 h before mixing with NaOH for extraction. After extraction, the powder was heated at 800°C for 4 h, to maintain the silica is in amorphous phase. Physical characteristics were analysed using transmission electron microscopy (TEM) for measuring particle size, Brunauer-Emmett-Teller (BET) technique for surf

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25

Kazadi, D. M., D. R. Groot, J. D. Steenkamp, and H. Pöllmann. "Control of silica polymerisation during ferromanganese slag sulphuric acid digestion and water leaching." Hydrometallurgy 166 (December 2016): 214–21. http://dx.doi.org/10.1016/j.hydromet.2016.06.024.

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26

Mansoori, Alireza, and Kiachehr Behfarnia. "Evaluation of the effects of nanomaterials on durability of engineered cementitious composites exposed to the aggressive environment." Journal of Composite Materials 54, no. 14 (2019): 1807–17. http://dx.doi.org/10.1177/0021998319887208.

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The present study was aimed to evaluate the effect of micro silica, nano silica and carbon nanotube in the engineered cementitious composites made with polyvinyl alcohol fibers. Accordingly, the compressive strength and the modulus of the samples rupture were studied to evaluate the impact of micro silica, nano silica and carbon nanotube in engineered cementitious composite. In addition, different curing conditions were considered to investigate the durability of the mixes. In this regard, the mechanical properties of the samples cured in sulphuric acid and freeze and thaw cycling were compare

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27

Chaudhary, Satish Kumar, and Ajay Kumar Sinha. "Effect of Silica Fume on Permeability and Microstructure of High Strength Concrete." Civil Engineering Journal 6, no. 9 (2020): 1697–703. http://dx.doi.org/10.28991/cej-2020-03091575.

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The important concrete structure in the vicinity of industry, thermal power plant suffers deterioration by the acid rain cause due to combination of CO2, SOx and NOx with rain water. A combined attack that is from acid as well as sulphate can be observed under impact of sulphuric acid. It attacks on Calcium hydroxide and form Calcium sulphate, which can be leached out easily and make Interfacial Transition Zone (ITZ) poor. The water retaining structure such as dam, weir should be impermeable and that can be achieved by binary cementitious blends, using Silica fume (SF). Silica fume a by produc

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28

Mučaji, P., and M. Nagy. "Contribution to the TLC separation of ursolic and oleanolic acid mixture." Acta Facultatis Pharmaceuticae Universitatis Comenianae 58, no. 1 (2011): 56–61. http://dx.doi.org/10.2478/v10219-011-0006-0.

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Contribution to the TLC separation of ursolic and oleanolic acid mixtureThe aim of the study was to develop a rapid, simple, effective and reproducible TLC method for separation of a naturally occurring mixture of ursolic and oleanolic acids. Because of the similarity of chemical structures,in situderivatisation by iodine was necessary to separate these triterpenic acids. Separation was achieved on silica gel plates. After derivatisation, a chromatographic plate was developed with the mobile phase consisting of light petrol, ethyl acetate and acetone (8.2:1.8:0.1, v/v/v) following visualisatio

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29

Jesionowski, Teofil. "Preparation of colloidal silica from sodium metasilicate solution and sulphuric acid in emulsion medium." Colloids and Surfaces A: Physicochemical and Engineering Aspects 190, no. 1-2 (2001): 153–65. http://dx.doi.org/10.1016/s0927-7757(01)00675-6.

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30

Said, Shwan H. "A Review Study on the Characterization of Geopolymer Concrete." Key Engineering Materials 821 (September 2019): 472–78. http://dx.doi.org/10.4028/www.scientific.net/kem.821.472.

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Ordinary Portland cement (OPC) is the essential binding material to produce the OPC concrete. Production of OPC is recently attaining a rate of 2.6 billion ton per year worldwide and growing 5% annually. OPC contributes at rate of 5 – 8% of human-worldwide CO2 emissions which are the greenhouse gases pollute the atmosphere. Geopolymer concrete (GPC) is a creative, sustainable, economical and eco-friendly material for construction industry, which is a suitable alternative to the OPC concrete, able to extensively curb the CO2 emissions. To prepare this kind of concrete, a combination of pozzolan

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31

Hassan, Mervat, and Hassan El-Shall. "Texture and Microstructure of Thermally-Treated Acid-Leached Kaolinitic Clays." Adsorption Science & Technology 27, no. 7 (2009): 671–84. http://dx.doi.org/10.1260/0263-6174.27.7.671.

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Natural and modified kaolinitic clays were investigated by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM and EDS) and N2 adsorption techniques. Disordered, poorly crystalline kaolinite, containing some quartz and very little mica, was calcined at different temperatures and different times and then leached with 25 wt% sulphuric acid for 1 h at 98 °C. Calcination led to a reduction in both the specific surface area and the total pore volume due to dehydroxylation of kaolinite to meta-kaolinite (MK). However, subsequent leaching of the

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32

Bouabdallah, Soufiane, Abdeslam Chaib, Mohamed Bounouala, Nadiia Dovbash, Aissa Benselhoub, and Stefano Bellucci. "Recycling of siliceous by-products to reduce their impacts on the environment." Technology audit and production reserves 2, no. 3(70) (2023): 31–36. http://dx.doi.org/10.15587/2706-5448.2023.277784.

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Currently, there is a tendency to use less silica rich ores given the depletion of high-quality resources. The raw kaolin treatment of Tamazert (Eastern Algeria) produces, by hydrocyclone process, approximately 80 % of siliceous by-products. These siliceous wastes, which are stored in the open air, constitute a significant environmental problem. This research work aims to improve the quality of siliceous by-products, more particularly, to a process for the elimination of iron oxides and aluminum to make this raw material usable industrially as well as solving environmental issues. The collecte

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Rasheed, Sk, D. Nageswar Rao, A. Siva Reddy, Ravi Shankar, and Parthasarathi Das. "Sulphuric acid immobilized on silica gel (H2SO4–SiO2) as an eco-friendly catalyst for transamidation." RSC Advances 5, no. 14 (2015): 10567–74. http://dx.doi.org/10.1039/c4ra16571c.

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A novel method of transamidation of carboxamides with amines using catalytic amounts of H<sub>2</sub>SO<sub>4</sub>–SiO<sub>2</sub> under solvent-free conditions has been developed. The scope of the methodology has been demonstrated with primary and secondary amines.

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34

Karmee, Sanjib Kumar. "Technical valorisation of spent coffee grounds and food waste using sulphuric acid immobilised on silica." Biofuels 11, no. 2 (2017): 155–61. http://dx.doi.org/10.1080/17597269.2017.1378989.

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35

Rajendran, A. "Silica Sulphuric Acid Catalyzed Fischer Esterification Reaction under Solventless Condition: A Novel Green Chemical Reaction." American Chemical Science Journal 1, no. 1 (2011): 28–36. http://dx.doi.org/10.9734/acsj/2011/264.

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36

Siddiqui, Zeba N., Kulsum Khan та Nayeem Ahmed. "Nano Fibrous Silica Sulphuric Acid as an Efficient Catalyst for the Synthesis of β-Enaminone". Catalysis Letters 144, № 4 (2014): 623–32. http://dx.doi.org/10.1007/s10562-013-1190-4.

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Mishra, S. B., S. Singh, and A. Mukerjee. "DEVELOPMENT AND VALIDATION OF HIGH-PERFORMANCE THIN-LAYER CHROMATOGRAPHIC METHOD FOR THE DETERMINATION OF RUTIN FROM THE AERIAL PARTS OF ALHAGI PSEUDALHAGI (M. BIEB) DESV." INDIAN DRUGS 55, no. 05 (2018): 37–41. http://dx.doi.org/10.53879/id.55.05.10866.

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A simple, accurate and precise HPTLC method has been developed for the estimation of rutin from the aerial parts of Alhagi pseudalhagi (M. Bieb) Desv. The method employed silica gel 60 F254 precoated plates as stationary phase and a mixture of ethyl acetate: acetic acid: formic acid: water (10:1:1:1 v/v/v/v) as mobile phase. Densitometric scanning was performed at 366 nm after derivatizing the resolved peaks with anisaldehyde-sulphuric acid reagent. Beer’s law was obeyed in the concentration range of 400-1200ng/spot with regression equation for standard rutin as Y= 7.658x - 53.86 and r2=0.9885

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Freidin, C. "Stability of silica concrete based on quartz bond in water, sodium sulphate, and sulphuric acid solutions." British Ceramic Transactions 100, no. 3 (2001): 129–33. http://dx.doi.org/10.1179/096797801681341.

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Idris, Mohd, Seema Srivastava, T. R. Baggi, S. K. Shulka, and A. K. Ganjoo. "Rhodamine-Sulphuric Acid -A New Visualization Reagent for the Determination of Sucralose by HPTLC." E-Journal of Chemistry 7, s1 (2010): S559—S565. http://dx.doi.org/10.1155/2010/264369.

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Sucralose a UV-visible inactive compound was separated on silica gel plate without any plate treatment prior to analysis, derivatized with rhodamine - sulphuric acid reagent and detected densitometrically at 456 nm as olive green band. With this reagent sucralose also shows golden yellow fluorescence at 366 nm. Two new solvent systemsi.e. chloroform: methanol: toluene (v/v 5:3.5:1.5) (solvent system-I) and chloroform: ethanol: benzene (v/v 5:3:2) (solvent system-II) were developed and giving Rfvalues of 0.62 and 0.45 respectively. The method was found to be sensitive with good limit of detecti

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Soufiane, Bouabdallah, Chaib Abdeslam, Bounouala Mohamed, Dovbash Nadiia, Benselhoub Aissa, and Bellucci Stefano. "Recycling of siliceous by-products to reduce their impacts on the environment." Technology audit and production reserves 2, no. 3(70) (2023): 31–36. https://doi.org/10.15587/2706-5448.2023.277784.

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<em>Currently, there is a tendency to use less silica rich ores given the depletion of high-quality resources. The raw kaolin treatment of Tamazert (Eastern Algeria) produces, by hydrocyclone process, approximately 80 % of siliceous by-products. These siliceous wastes, which are stored in the open air, constitute a significant environmental problem. This research work aims to improve the quality of siliceous by-products, more particularly, to a process for the elimination of iron oxides and aluminum to make this raw material usable industrially as well as solving environmental issues. The coll

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Potawale, Rani, Hiba Parker, and Amit Karwande. "VALIDATED HPTLC METHOD FOR SIMULTANEOUS QUANTIFICATION OF GYMNEMAGENIN AND GALLIC ACID IN HERBAL DOSAGE FORM." Journal of Advanced Scientific Research 13, no. 02 (2022): 136–41. http://dx.doi.org/10.55218/jasr.202213218.

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The research work was carried out to develop and validate new, rapid, precise and robust high performance thin layer chromatographic method for concurrent quantitative determination of gymnemagenin and gallic acid in selected herbal formulation with densitometric detection. Separation was attained on Merck aluminium HPTLC plates precoated with silica gel 60 F254. The solvent system which is optimaized contained toluene: ethyl acetate: methanol: acetic acid: formic acid (10.4: 4: 4: 0.4: 0.3, v/v/v/v). Developed plates were derivatized by 5% sulphuric acid reagent followed by heating at 110°C f

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Basir, Dasril, Miksusanti Miksusanti, Susilawati Susilawati, and Dian Dwita Maizur. "Alkaloids of Fagraea fragrans (Tembesu) Fruits." Indonesian Journal of Fundamental and Applied Chemistry 6, no. 3 (2020): 64–68. http://dx.doi.org/10.24845/ijfac.v6.i3.64.

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The aim of this paper is to visualize the alkaloids of Fagraea fragrans fruits therefore the fruits can be scientifically used as herb traditional medicines and phytocosmetics. Three alkaloids have successfully been identified from those Fagraea fragrans fruits, Loganiaceae. They are gentialutine, gentianine, and isaindigotone. The alkaloids were alternately explored by means of ether and 2% H2SO4 extractions. The sulphuric acid phase was naturalized with ammonium chloride and then extracted with ethyl acetate. The residue were then subjected to silica gel G60 (70-230 mesh) column chromatograp

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M, Surendar, Saravana Karthika V, and Naresh Kumar D. "Characteristics of Epoxy Resin Polymer Mortar with Different Filler Materials." International Journal of Engineering & Technology 7, no. 4.2 (2018): 30. http://dx.doi.org/10.14419/ijet.v7i4.2.19996.

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A binding material forms the core of any construction material as it physically, chemically and mechanically holds the mix together. From lime to cement, the binding materials used conventionally has changed and evolved. Cement is a mineral binding material which reacts with water and has to be cured over a 28-day period to attain its characteristic strength in addition to holding the mix together as a homogenous substance. An organic binding material is one in which an organic substance like resins, bitumen, etc., make a transition from a plastic state to hardened state by a physical or chemi

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Yakaiah, T., G. Venkat Reddy, B. P. V. Lingaiah, B. Narsaiah та P. Shanthan Rao. "Silica Sulphuric Acid: An Efficient and Recyclable Catalyst for the Synthesis of β‐Acetamido Ketones in Single Pot". Synthetic Communications 35, № 10 (2005): 1307–12. http://dx.doi.org/10.1081/scc-200057240.

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Saha, Manabendra, Sanchita Roy, Subrata Kumar Chaudhuri, and Sanjay Bhar. "Formation of Dioxolane on the Surface of Silica–Sulphuric Acid in Dry Media—Chemoselective Protection of Aryl Aldehydes." Synthetic Communications 37, no. 12 (2007): 1989–93. http://dx.doi.org/10.1080/00397910701356421.

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Stopic, Srecko, Richard Schneider, Duško Kostić, et al. "Combined Decarbonizing Technologies for Treatment of Bauxite Residues." Waste 3, no. 2 (2025): 11. https://doi.org/10.3390/waste3020011.

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This study explores both pyrometallurgical and hydrometallurgical methods for decarbonizing and recovering valuable metals from bauxite residue, with hydrogen plasma reduction and direct acid leaching as the primary approaches. The goal is to offer innovative techniques for extracting metals from bauxite residue, a by-product of the Bayer process, which cannot be disposed of in an environmentally sustainable manner. Additionally, reducing the volume of bauxite residue through combined treatments is a key objective. In contrast to traditional carbon-based reductive melting, which generated sign

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Renuka, Jana, and Konda Rajasekhar. "Studies on Effect of Sulphuric Acid Attack on Concrete Made with Colloidal Silica as Replacement and Addition to Cement." Ecological Engineering & Environmental Technology 25, no. 6 (2024): 331–43. http://dx.doi.org/10.12912/27197050/187771.

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Sing, K. S. W., and J. D. Madeley. "The surface properties of silica gels. I. Importance of pH in the preparation from sodium silicate and sulphuric acid." Journal of Applied Chemistry 3, no. 12 (2007): 549–56. http://dx.doi.org/10.1002/jctb.5010031205.

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Grace, A. Sahila, and G. S. Prabha Littis Malar. "Preparation, Characterization and Applications of Chitosan-Nanosilica-Graphene Oxide Nanocomposite." Asian Journal of Chemistry 33, no. 11 (2021): 2789–95. http://dx.doi.org/10.14233/ajchem.2021.23419.

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In present study, a simple low cost method was used to prepare chitosan-nanosilica-graphene oxide (CS-NSi-GO) nanocomposite. Nanosilica and graphene oxide were synthesized from coconut husk ash and chitosan was synthesized from shrimp shell. Nanosilica was synthesized from coconut husk ash with alkaline extraction using sodium hydroxide followed by precipitation method using sulphuric acid. Graphene oxide was synthesized from the oxidative treatment of the raw material of coconut husk ash. After the synthesis of silica, the carbonized graphite was collected and treated by modified Hummer’s met

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Tian, Liangliang, Yongfu Shi, Dongmei Huang, Huijuan Yu, Shuai Wang, and Youqiong Cai. "Analysis and Evaluation of 7 Indictor Polychlorinated Biphenyls (PCBs) Residues in Dried Kelp by Gas Chromatography (GC)." E3S Web of Conferences 165 (2020): 03044. http://dx.doi.org/10.1051/e3sconf/202016503044.

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In this study, a special method was developed for the determination of 7 kinds of polychlorinated biphenyls (PCBs) residues in dried kelp by gas chromatography (GC) with electron capture detector (ECD). The PCBs were extracted with hexane/dichloromethane (1/1, v/v) by ultrasonic extraction. Clean-up methods were used by concentrated sulphuric acid, neutral alumina oxide solid phase extraction cartridge and silica solid phase extraction cartridge. The analytical compounds were quantified by an internal standard method. Under optimal experimental conditions, good linearity was observed in the ra

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