Pub Date : 2024-07-16DOI: 10.1134/s107042722311005x
A. I. Wozniak, I. V. Lunev, A. A. Galiullin, M. V. Bermeshev
Abstract
Dielectric properties of a series of addition poly(5-n-alkylnorbornenes) (alkyl = ethyl, n-butyl, n-hexyl, n-decyl, and n-tetradecyl) were studied in a wide range of electric field frequencies (0.01–1 × 106 Hz) and temperatures (form –100 to +100°С). The relative dielectric permittivity of these polymers varies from 1.97 to 2.31 at the field frequency of 1 MHz and temperature of 25°С. Addition poly(5-n-butyl-2-norbornene) has the minimal dielectric permittivity. The dielectric permittivity of the addition polymers in the glassy state remained virtually constant in the frequency and temperature ranges examined. All the polynorbornenes prepared exhibit low values of the dielectric loss (εʺ ~ 10–3–10–4) and dielectric loss tangent (tan δ ~ 10–3–10–4) in the major part of the frequency and temperature ranges examined. However, εʺ and tan δ of the polymers with long alkyl substituents (n-hexyl, n-decyl, and n-tetradecyl) considerably increased at low frequencies and high temperatures.
{"title":"Dielectric Properties of Addition Poly(5-n-alkylnorbornenes)","authors":"A. I. Wozniak, I. V. Lunev, A. A. Galiullin, M. V. Bermeshev","doi":"10.1134/s107042722311005x","DOIUrl":"https://doi.org/10.1134/s107042722311005x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Dielectric properties of a series of addition poly(5-<i>n-</i>alkylnorbornenes) (alkyl = ethyl, <i>n</i>-butyl, <i>n</i>-hexyl, <i>n</i>-decyl, and <i>n</i>-tetradecyl) were studied in a wide range of electric field frequencies (0.01–1 × 10<sup>6</sup> Hz) and temperatures (form –100 to +100°С). The relative dielectric permittivity of these polymers varies from 1.97 to 2.31 at the field frequency of 1 MHz and temperature of 25°С. Addition poly(5-<i>n</i>-butyl-2-norbornene) has the minimal dielectric permittivity. The dielectric permittivity of the addition polymers in the glassy state remained virtually constant in the frequency and temperature ranges examined. All the polynorbornenes prepared exhibit low values of the dielectric loss (εʺ ~ 10<sup>–3</sup>–10<sup>–4</sup>) and dielectric loss tangent (tan δ ~ 10<sup>–3</sup>–10<sup>–4</sup>) in the major part of the frequency and temperature ranges examined. However, εʺ and tan δ of the polymers with long alkyl substituents (<i>n</i>-hexyl, <i>n</i>-decyl, and <i>n</i>-tetradecyl) considerably increased at low frequencies and high temperatures.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141717331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-16DOI: 10.1134/s1070427223110036
M. P. Boronoev, I. I. Shakirov, E. A. Roldugina, Yu. S. Kardasheva, S. V. Kardashev
Abstract
Catalysts based on Ru and Pd nanoparticles on mesoporous hybrid supports consisting of mesoporous phenol–formaldehyde polymers and silica were synthesized. The catalysts were tested in furfural hydrogenation at 150–250°С and hydrogen pressure of 3 MPa. In furfural hydrogenation in the presence of the Pd catalyst, the yield of tetrahydrofurfuryl alcohol was 99% when performing the reaction in ethanol, whereas the Ru catalyst showed high selectivity with respect to cyclopentanone (80%) in furfural hydrogenation in water. The hybrid catalysts exhibit higher activity than the polymer analogs.
{"title":"Furfural Hydrogenation in the Presence of Ru and Pd Catalysts Immobilized on Hybrid Materials Based on Mesoporous Phenol–Formaldehyde Polymers and Silica","authors":"M. P. Boronoev, I. I. Shakirov, E. A. Roldugina, Yu. S. Kardasheva, S. V. Kardashev","doi":"10.1134/s1070427223110036","DOIUrl":"https://doi.org/10.1134/s1070427223110036","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Catalysts based on Ru and Pd nanoparticles on mesoporous hybrid supports consisting of mesoporous phenol–formaldehyde polymers and silica were synthesized. The catalysts were tested in furfural hydrogenation at 150–250°С and hydrogen pressure of 3 MPa. In furfural hydrogenation in the presence of the Pd catalyst, the yield of tetrahydrofurfuryl alcohol was 99% when performing the reaction in ethanol, whereas the Ru catalyst showed high selectivity with respect to cyclopentanone (80%) in furfural hydrogenation in water. The hybrid catalysts exhibit higher activity than the polymer analogs.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141722071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-16DOI: 10.1134/s1070427223110024
P. V. Davydova, V. A. Korolev
Abstract
The possibility of recovering Rh, Ru, and Pd from nitric and hydrochloric acid solutions with Fe4[Fe(CN)6]3 was examined. The conditions for practically complete recovery of the sum of platinum group metals from nitric acid solutions at the acid concentrations in the interval 1–5 M were determined. From hydrochloric acid solutions, Rh and Ru can be recovered at the acid concentration of 0.1–0.5 М. Pd is completely recovered from both 1–5 M nitric and 1–5 M hydrochloric acid solutions. From simulated spent nuclear fuel reprocessing solutions, Cs, Mo, and Zr are recovered to different extents jointly with Rh, Ru, and Pd. The Rh and Ru sorption isotherms are described by the Langmuir equation. The Pd sorption isotherm has a nonstandard two-step shape. Fe4[Fe(CN)6]3 can be recommended for recovering platinum metals from process solutions, including those from reprocessing of spent nuclear fuel and spent catalysts.
摘要 研究了用 Fe4[Fe(CN)6]3 从硝酸和盐酸溶液中回收 Rh、Ru 和 Pd 的可能性。确定了在 1-5 M 的酸浓度范围内从硝酸溶液中几乎完全回收铂族金属总和的条件。在酸浓度为 0.1-0.5 М 的盐酸溶液中，可以回收 Rh 和 Ru。钯可从 1-5 M 硝酸和 1-5 M 盐酸溶液中完全回收。在模拟的乏核燃料后处理溶液中，Cs、Mo 和 Zr 与 Rh、Ru 和 Pd 一起在不同程度上被回收。Rh 和 Ru 的吸附等温线由 Langmuir 方程描述。钯的吸附等温线具有非标准的两级形状。建议使用 Fe4[Fe(CN)6]3 从工艺溶液中回收铂金属，包括从乏核燃料和乏催化剂的后处理溶液中回收铂金属。
{"title":"Recovery of Rhodium, Ruthenium, and Palladium from Nitric and Hydrochloric Acid Solutions with Iron(III) Hexacyanoferrate(II)","authors":"P. V. Davydova, V. A. Korolev","doi":"10.1134/s1070427223110024","DOIUrl":"https://doi.org/10.1134/s1070427223110024","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The possibility of recovering Rh, Ru, and Pd from nitric and hydrochloric acid solutions with Fe<sub>4</sub>[Fe(CN)<sub>6</sub>]<sub>3</sub> was examined. The conditions for practically complete recovery of the sum of platinum group metals from nitric acid solutions at the acid concentrations in the interval 1–5 M were determined. From hydrochloric acid solutions, Rh and Ru can be recovered at the acid concentration of 0.1–0.5 М. Pd is completely recovered from both 1–5 M nitric and 1–5 M hydrochloric acid solutions. From simulated spent nuclear fuel reprocessing solutions, Cs, Mo, and Zr are recovered to different extents jointly with Rh, Ru, and Pd. The Rh and Ru sorption isotherms are described by the Langmuir equation. The Pd sorption isotherm has a nonstandard two-step shape. Fe<sub>4</sub>[Fe(CN)<sub>6</sub>]<sub>3</sub> can be recommended for recovering platinum metals from process solutions, including those from reprocessing of spent nuclear fuel and spent catalysts.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141717329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-28DOI: 10.1134/s1070427224020010
Kishor Palle, Sambhani Naga Gayatri, Ramesh Kola, Ch Sandhya Rani, P. Ramesh Babu, L. Vijayalakshmi, Seong Jin Kwon, Md. Mustaq Ali
Abstract
In this study, the effects of artificial neural networks on CO2 adsorption on several types of rice husk activated carbon samples are investigated. Using conventional approach, the eight activated carbon samples are examined for carbon dioxide adsorption at 298 K and up to 1 bar pressure. The influence of altered training/validating ratios, various data initiation points, various training algorithms and number of neurons necessary for an artificial neural network model were investigated using ANN modelling. The work can give useful information on the effects of each of the investigated factors, which are crucial in ANN modelling and training techniques. The results may be used to create an optimum activated carbon, improved applications of gas and oil purification that plan to use artificial intelligence modelling in their evaluations.
摘要 本研究探讨了人工神经网络对几种稻壳活性炭样品吸附二氧化碳的影响。采用传统方法，在 298 K 和高达 1 bar 的压力下检测了 8 种活性炭样品对二氧化碳的吸附情况。使用人工神经网络模型研究了改变训练/验证比例、各种数据起始点、各种训练算法和人工神经网络模型所需的神经元数量的影响。这项工作可以提供有关每个调查因素的影响的有用信息，这些因素对人工神经网络建模和训练技术至关重要。研究结果可用于创建最佳活性炭，改进计划在评估中使用人工智能建模的天然气和石油净化应用。
{"title":"Carbon Dioxide Adsorption Study on Rice Husk Activated Carbons by Artificial Neural Network (ANN)","authors":"Kishor Palle, Sambhani Naga Gayatri, Ramesh Kola, Ch Sandhya Rani, P. Ramesh Babu, L. Vijayalakshmi, Seong Jin Kwon, Md. Mustaq Ali","doi":"10.1134/s1070427224020010","DOIUrl":"https://doi.org/10.1134/s1070427224020010","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this study, the effects of artificial neural networks on CO<sub>2</sub> adsorption on several types of rice husk activated carbon samples are investigated. Using conventional approach, the eight activated carbon samples are examined for carbon dioxide adsorption at 298 K and up to 1 bar pressure. The influence of altered training/validating ratios, various data initiation points, various training algorithms and number of neurons necessary for an artificial neural network model were investigated using ANN modelling. The work can give useful information on the effects of each of the investigated factors, which are crucial in ANN modelling and training techniques. The results may be used to create an optimum activated carbon, improved applications of gas and oil purification that plan to use artificial intelligence modelling in their evaluations.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141528990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CeO2–MnOx mixed oxides supported on different carriers (ZSM-5, TiO2, and SAPO-34) were prepared by the sol-gel combustion method and evaluated for the selective catalytic reduction of NO with NH3. The physicochemical properties of the samples were determined by using XRD, TEM, N2 adsorption (BET method), H2-TPR, and NH3-TPD. The Ce–Mn/TiO2 exhibited a higher NO conversion than Ce–Mn/ZSM-5 in the 100-200°C temperature range, but the NO conversion of Ce–Mn/ZSM-5 increases with reaction temperature (being the N2 selectivity close to 100%) whereas, for Ce–Mn/TiO2, the N2 selectivity extremely decreases. The reducibility and surface acidity of samples seems to explain the catalytic performance. Thus, although the reducibility of Ce–Mn/ZSM-5 and Ce–Mn/TiO2 was similar, the large number of surface acid sites of Ce–Mn/ZSM-5 could be a plausible reason for its excellent SCR activity. In fact, the superior SCR activity of Ce–Mn/ZSM-5 (94% NO conversion and 95% N2 selectivity at 300°C) is related to the presence of well-dispersed Ce–Mn mixed oxide nanoparticles, high reducibility, and a large number of surface acid sites.
{"title":"Physicochemical Properties and NH3-SCR Performance of Supported CeO2–MnOx Mixed Oxides Catalysts","authors":"Seyed Mahdi Mousavi, Parvaneh Nakhostin Panahi, Aligholi Niaei","doi":"10.1134/s1070427224020034","DOIUrl":"https://doi.org/10.1134/s1070427224020034","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>CeO<sub>2</sub>–MnO<sub><i>x</i></sub> mixed oxides supported on different carriers (ZSM-5, TiO<sub>2</sub>, and SAPO-34) were prepared by the sol-gel combustion method and evaluated for the selective catalytic reduction of NO with NH<sub>3</sub>. The physicochemical properties of the samples were determined by using XRD, TEM, N<sub>2</sub> adsorption (BET method), H<sub>2</sub>-TPR, and NH<sub>3</sub>-TPD. The Ce–Mn/TiO<sub>2</sub> exhibited a higher NO conversion than Ce–Mn/ZSM-5 in the 100-200°C temperature range, but the NO conversion of Ce–Mn/ZSM-5 increases with reaction temperature (being the N<sub>2</sub> selectivity close to 100%) whereas, for Ce–Mn/TiO<sub>2</sub>, the N<sub>2</sub> selectivity extremely decreases. The reducibility and surface acidity of samples seems to explain the catalytic performance. Thus, although the reducibility of Ce–Mn/ZSM-5 and Ce–Mn/TiO<sub>2</sub> was similar, the large number of surface acid sites of Ce–Mn/ZSM-5 could be a plausible reason for its excellent SCR activity. In fact, the superior SCR activity of Ce–Mn/ZSM-5 (94% NO conversion and 95% N<sub>2</sub> selectivity at 300°C) is related to the presence of well-dispersed Ce–Mn mixed oxide nanoparticles, high reducibility, and a large number of surface acid sites.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141519680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, the anticorrosive properties of a series of sodium methyl ester sulfonate anionic surfactants on a carbon steel were estimated for an oilfield injection water collected from a well of Hassi R’Mel region—Algeria, known as Baremian water, and are compared to those of sodium dodecyl sulfate. This class of surfactants was synthesized from fatty acids by a photochemical process and present good physico-chemical properties and good biodegradability. The inhibition performance was evaluated by weight loss and electrochemical techniques: linear polarization resistance and electrochemical impedance spectroscopy. The results showed that these surfactants are good inhibitors; the inhibition efficiency increases with increasing concentration surfactants. In addition, the increase of chain length surfactants leads to the best inhibition efficiency for sodium sulfo palmityl methyl ester surfactant with 95.27, 98.20, and 95% via weight loss, linear polarization resistance and electrochemical impedance spectroscopy, respectively. Scanning electron microscopy–Energy dispersive X-ray allowed the visualization of a good adhesion of the protective deposit formed by the surfactants on the carbon steel surface including the elements presents on this surface as sodium and sulfur. The adsorption of these surfactants shows the maximum adherence to the Langmuir model and the values of Gibbs free energy of adsorption indicated that the inhibitor molecules are physically adsorb onto the metal surface.
{"title":"Application of Sodium Methyl Ester Sulfonate Anionic Surfactants as Corrosion Inhibitors for Carbon Steel in Oilfield Injection Water","authors":"Asselah Amel, Affif Chaouche M’Yassa, Amel Tazerouti","doi":"10.1134/s1070427224020046","DOIUrl":"https://doi.org/10.1134/s1070427224020046","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this study, the anticorrosive properties of a series of sodium methyl ester sulfonate anionic surfactants on a carbon steel were estimated for an oilfield injection water collected from a well of Hassi R’Mel region—Algeria, known as Baremian water, and are compared to those of sodium dodecyl sulfate. This class of surfactants was synthesized from fatty acids by a photochemical process and present good physico-chemical properties and good biodegradability. The inhibition performance was evaluated by weight loss and electrochemical techniques: linear polarization resistance and electrochemical impedance spectroscopy. The results showed that these surfactants are good inhibitors; the inhibition efficiency increases with increasing concentration surfactants. In addition, the increase of chain length surfactants leads to the best inhibition efficiency for sodium sulfo palmityl methyl ester surfactant with 95.27, 98.20, and 95% via weight loss, linear polarization resistance and electrochemical impedance spectroscopy, respectively. Scanning electron microscopy–Energy dispersive X-ray allowed the visualization of a good adhesion of the protective deposit formed by the surfactants on the carbon steel surface including the elements presents on this surface as sodium and sulfur. The adsorption of these surfactants shows the maximum adherence to the Langmuir model and the values of Gibbs free energy of adsorption indicated that the inhibitor molecules are physically adsorb onto the metal surface.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141504678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The effect of glycol derivatives including ethylene glycol (EG), diethylene glycol (DEG), and triethylene glycol (TEG) has been investigated on the characterization Al2O3 coating of anodized 7075-T6 aluminum in 20% w/w sulfuric acid, current density 4 A/dm2, and time 50 min. The thickness and hardness of Al2O3 layer measured and characterized by X-ray diffraction patterns, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The Tafle plots of linear polarization method and electrochemical impedance spectroscopy technique used to investigate the resistance to corrosion Al2O3 layer. The results showed that the thickness, hardness, and resistance to corrosion of Al2O3 film are increased, respectively, 30, 42, and 40% in the presence of glycols (10% w/w). The ratio of dielectric constant (ε) to dynamic viscosity (η) of TEG, DEG, and EG, respectively, is 0.48, 0.89, and 2.28 that is due to improvement of anodized aluminum in the presence glycol derivatives as EG > DEG > TEG.
{"title":"Surface Investigation of Aerospace 7075-T6 Aluminum Anodized in the Presence of Glycols","authors":"Hamid Reza Pouretedal, Hossian Rasooli, Saeed Mahbob","doi":"10.1134/s1070427224020058","DOIUrl":"https://doi.org/10.1134/s1070427224020058","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The effect of glycol derivatives including ethylene glycol (EG), diethylene glycol (DEG), and triethylene glycol (TEG) has been investigated on the characterization Al<sub>2</sub>O<sub>3</sub> coating of anodized 7075-T6 aluminum in 20% w/w sulfuric acid, current density 4 A/dm<sup>2</sup>, and time 50 min. The thickness and hardness of Al<sub>2</sub>O<sub>3</sub> layer measured and characterized by X-ray diffraction patterns, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The Tafle plots of linear polarization method and electrochemical impedance spectroscopy technique used to investigate the resistance to corrosion Al<sub>2</sub>O<sub>3</sub> layer. The results showed that the thickness, hardness, and resistance to corrosion of Al<sub>2</sub>O<sub>3</sub> film are increased, respectively, 30, 42, and 40% in the presence of glycols (10% w/w). The ratio of dielectric constant (ε) to dynamic viscosity (η) of TEG, DEG, and EG, respectively, is 0.48, 0.89, and 2.28 that is due to improvement of anodized aluminum in the presence glycol derivatives as EG > DEG > TEG.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141519679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-28DOI: 10.1134/s107042722402006x
A. H. Ali
Abstract
Batch experiments were used in this study to investigate the cleaning of phosphoric acid solution from cationic impurities. A set of steps was used to clean up wet-processed phosphoric acid to technical grade phosphoric acid, which included solvent extraction, scrubbing, stripping, evaporation, contacting the produced phosphoric acid with two types of carbon (activated carbon as received and oxidized activated carbon) for 1 h, filtration, neutralizing the acid with ammonia solution to pH 7 to produce soluble salt of ammonium phosphate, filtration, again contacting the phosphate salt solution with the two types of carbon for 1 h. Finally, contacting it with resin Amberlite IR 120-H- form or adding sulfuric acid to obtain purified technical grade phosphoric acid or producing barium or ammonium phosphate salts. Different variables that influence the adsorption process were examined, including medium acidity, shaking time, adsorbent-to-volume ratio, temperature, and phosphoric acid initial concentrations. The adsorption isotherms, the Langmuir isotherm model (R2 = 0.99), and the Freundlich model (R2 = 0.76) were studied to assess the maximal removal efficacy of adsorbents; it was found that the experimental results agreed with the Langmuir isotherm.
{"title":"Sequential Steps for Purifying Wet Processed Phosphoric Acid for Producing a High-Tech Grade and Barium or Ammonium Phosphate Salts","authors":"A. H. Ali","doi":"10.1134/s107042722402006x","DOIUrl":"https://doi.org/10.1134/s107042722402006x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Batch experiments were used in this study to investigate the cleaning of phosphoric acid solution from cationic impurities. A set of steps was used to clean up wet-processed phosphoric acid to technical grade phosphoric acid, which included solvent extraction, scrubbing, stripping, evaporation, contacting the produced phosphoric acid with two types of carbon (activated carbon as received and oxidized activated carbon) for 1 h, filtration, neutralizing the acid with ammonia solution to pH 7 to produce soluble salt of ammonium phosphate, filtration, again contacting the phosphate salt solution with the two types of carbon for 1 h. Finally, contacting it with resin Amberlite IR 120-H- form or adding sulfuric acid to obtain purified technical grade phosphoric acid or producing barium or ammonium phosphate salts. Different variables that influence the adsorption process were examined, including medium acidity, shaking time, adsorbent-to-volume ratio, temperature, and phosphoric acid initial concentrations. The adsorption isotherms, the Langmuir isotherm model (<i>R</i><sup>2</sup> = 0.99), and the Freundlich model (<i>R</i><sup>2</sup> = 0.76) were studied to assess the maximal removal efficacy of adsorbents; it was found that the experimental results agreed with the Langmuir isotherm.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141532582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-22DOI: 10.1134/s1070427224010154
Firdos M. Abdulla, Zainab Y. Shnain, Asawer A. Alwaisit, Mohammad F. Abid
Abstract
The aim of the work is to investigate the use of synthetic doped catalyst in the removal of benzene, toluene, and xylene (BTX) from petroleum wastewater by photocatalyst process in a circular column reactor. Fe2O3-doped anatase TiO2 with 10 nm average grain size was synthesized by the impregnation method. The prepared doped catalyst was characterized using energy-dispersive X-ray (EDS), scanning electron microscopy (SEM), Surface Area Analysis using the Brunauer–Emmett–Teller (BET), Fourier transforms infrared spectroscopy (FTIR) beforehand with XRD. Then it is evaluated in a photocatalyst process A which was done in a circular column with dimensions of 70 mm diameter and 390 mm height, under visible light. The study also shows the influence of pH, light intensity and residence time on the BTX removal. The experiment was carried out under different values of pH (3‒11), light intensity 14‒42 W and irradiation time 30‒120 min. The results show that the maximum removal efficiency was 90% when pH 6.5, 42 W light intensity and after 120 min. The kinetic model as well as Adsorption isotherm were also studied.
{"title":"Use of Synthetic Iron Oxide-Doped Titanium Dioxide Nanoparticles in Photocatalytic Degradation of BTX from Petroleum Wastewater","authors":"Firdos M. Abdulla, Zainab Y. Shnain, Asawer A. Alwaisit, Mohammad F. Abid","doi":"10.1134/s1070427224010154","DOIUrl":"https://doi.org/10.1134/s1070427224010154","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The aim of the work is to investigate the use of synthetic doped catalyst in the removal of benzene, toluene, and xylene (BTX) from petroleum wastewater by photocatalyst process in a circular column reactor. Fe<sub>2</sub>O<sub>3</sub>-doped anatase TiO<sub>2</sub> with 10 nm average grain size was synthesized by the impregnation method. The prepared doped catalyst was characterized using energy-dispersive X-ray (EDS), scanning electron microscopy (SEM), Surface Area Analysis using the Brunauer–Emmett–Teller (BET), Fourier transforms infrared spectroscopy (FTIR) beforehand with XRD. Then it is evaluated in a photocatalyst process A which was done in a circular column with dimensions of 70 mm diameter and 390 mm height, under visible light. The study also shows the influence of pH, light intensity and residence time on the BTX removal. The experiment was carried out under different values of pH (3‒11), light intensity 14‒42 W and irradiation time 30‒120 min. The results show that the maximum removal efficiency was 90% when pH 6.5, 42 W light intensity and after 120 min. The kinetic model as well as Adsorption isotherm were also studied.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141504679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-22DOI: 10.1134/s1070427224010130
Rana I. Raja, Khalid T. Rashid, Manal A. Toma
Abstract
Flux decline is one of the most significant defies ultrafiltration (UF) must overcome. One viable approach to address this issue involves the implementation of nano-additives into the membrane matrix. In this research, the potential of chamomile leaf nanoparticles (Chm NPs) as an eco-friendly material for use in UF membrane synthesis was explored. To better understand the impact of Chm on the production of PES UF membranes, a range of membranes were created by introducing varying amounts of Chm into the casting solution. The produced membranes were thoroughly evaluated, focusing on aspects such as porosity, pore size, hydrophilicity, membrane morphology, and UF performance. Manufactured PES/Chm membranes demonstrated significantly increased permeate water flux (PWF) (up to 367 L/m2 h), which was three times that of the pristine PES membrane (126 L/m2 h). Beside Methylene Blue dye (MB) rejection, it was obtained a high removal percent of about 94 %. Additionally, decreased contact angle (C.A.) for modified membranes (47%), compared with pristine PES membranes, all these results led to enhance the membrane permeate flux and rejection. The utilization of chamomile as a novel environmentally friendly addition holds significant potential in the production of UF membranes for wastewater treatment.
{"title":"Polyethersulfone/Chamomile Mixed Matrix Membrane for Methylene Blue Dye Removal from Wastewater","authors":"Rana I. Raja, Khalid T. Rashid, Manal A. Toma","doi":"10.1134/s1070427224010130","DOIUrl":"https://doi.org/10.1134/s1070427224010130","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Flux decline is one of the most significant defies ultrafiltration (UF) must overcome. One viable approach to address this issue involves the implementation of nano-additives into the membrane matrix. In this research, the potential of chamomile leaf nanoparticles (Chm NPs) as an eco-friendly material for use in UF membrane synthesis was explored. To better understand the impact of Chm on the production of PES UF membranes, a range of membranes were created by introducing varying amounts of Chm into the casting solution. The produced membranes were thoroughly evaluated, focusing on aspects such as porosity, pore size, hydrophilicity, membrane morphology, and UF performance. Manufactured PES/Chm membranes demonstrated significantly increased permeate water flux (PWF) (up to 367 L/m<sup>2</sup> h), which was three times that of the pristine PES membrane (126 L/m<sup>2</sup> h). Beside Methylene Blue dye (MB) rejection, it was obtained a high removal percent of about 94 %. Additionally, decreased contact angle (C.A.) for modified membranes (47%), compared with pristine PES membranes, all these results led to enhance the membrane permeate flux and rejection. The utilization of chamomile as a novel environmentally friendly addition holds significant potential in the production of UF membranes for wastewater treatment.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141504680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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