The Damanganga River faces severe pollution from industrial effluents and sewage, impacting its ecological health. The study aimed to analyze the current water quality status at the proposed conventional barrage site across the river between Silvassa, Vapi and Daman in India. Water samples were collected from three sites along the river during different seasons and analyzed for physicochemical parameters like TDS, COD, BOD, nutrients, fecal coliforms, heavy metals, etc. as per standard methods. Principal component analysis (PCA) was done. GCMS profiling of organics was also carried out. Several parameters exceeded the desired limits. TDS, BOD, fecal coliforms were very high indicating organic pollution and sewage contamination. Dissolved oxygen was deficient at some sites. Cadmium, copper and iron exceeded limits due to industrial releases containing these metals. PCA showed organic pollution as the major degrading factor for water quality followed by industrial contamination. GCMS analysis revealed hazardous organics like petrochemicals, fatty acids, solvents, pesticides and aromatic pollutants at varying levels along the river’s course demonstrating pollution from oil spillages, industrial effluents and agricultural runoff. The findings confirm severe deterioration in the Damanganga's water quality from inadequately treated sewage and industrial discharges posing environmental and health risks. Stringent regulations, proper wastewater treatment, runoff control and regular monitoring are vital to improve the river's condition
{"title":"Assessment of the Ecological Impact of Pollution in the Damanganga River","authors":"Manoj Godhaniya, Komal Antaliya, Rajesh Patel, Charmy Kothari","doi":"10.29303/aca.v7i1.201","DOIUrl":"https://doi.org/10.29303/aca.v7i1.201","url":null,"abstract":"The Damanganga River faces severe pollution from industrial effluents and sewage, impacting its ecological health. The study aimed to analyze the current water quality status at the proposed conventional barrage site across the river between Silvassa, Vapi and Daman in India. Water samples were collected from three sites along the river during different seasons and analyzed for physicochemical parameters like TDS, COD, BOD, nutrients, fecal coliforms, heavy metals, etc. as per standard methods. Principal component analysis (PCA) was done. GCMS profiling of organics was also carried out. Several parameters exceeded the desired limits. TDS, BOD, fecal coliforms were very high indicating organic pollution and sewage contamination. Dissolved oxygen was deficient at some sites. Cadmium, copper and iron exceeded limits due to industrial releases containing these metals. PCA showed organic pollution as the major degrading factor for water quality followed by industrial contamination. GCMS analysis revealed hazardous organics like petrochemicals, fatty acids, solvents, pesticides and aromatic pollutants at varying levels along the river’s course demonstrating pollution from oil spillages, industrial effluents and agricultural runoff. The findings confirm severe deterioration in the Damanganga's water quality from inadequately treated sewage and industrial discharges posing environmental and health risks. Stringent regulations, proper wastewater treatment, runoff control and regular monitoring are vital to improve the river's condition","PeriodicalId":7071,"journal":{"name":"Acta Chimica Asiana","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140684450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. R. Nasution, Ardhia Regita Cahyani, Alya Aqilla, Valentina Fitri, Leni Triani
The Bark of Marpuyan Tree (Rhodamnia cinerea Jack) is a plant that has been empirically used by communities in Indonesia for the treatment of infectious diseases caused by bacteria and fungi. The bark of Marpuyan contains flavonoids, phenolics, and saponins. This study aimed to evaluate the antibacterial and antifungal activities of the ethanol extract of the bark of Marpuyan using the disc diffusion method at various extract concentrations, namely 30%, 25%, 15%, 10%, and 5%. The results of the antibacterial activity test against Gram-positive bacteria (Staphylococcus aureus, Staphylococcus epidermidis, and Bacillus subtilis) showed inhibitory zones with respective diameters of 11.67±0.21 mm, 12.29±0.43 mm, and 12.78±0.14 mm. These results indicate weak antibacterial activity. In the antibacterial activity test against Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, and Salmonella typhi), inhibitory zones were found with respective diameters of 13.05±0.05 mm, 12.58±1.78 mm, and 10.98±0.21 mm. These results also indicate weak antibacterial activity. However, in the antifungal activity test, no activity was found against Candida albicans and Malassezia furfur. Nevertheless, the ethanol extract of Marpuyan bark showed moderate antifungal activity against Trichophyton mentagrophytes, with an inhibitory zone diameter of 15.44±2.02 mm.
{"title":"Antimicrobial of Ethanolic Extract from Marpuyan Stem Bark (Rhodamnia cinerea Jack)","authors":"M. R. Nasution, Ardhia Regita Cahyani, Alya Aqilla, Valentina Fitri, Leni Triani","doi":"10.29303/aca.v7i1.193","DOIUrl":"https://doi.org/10.29303/aca.v7i1.193","url":null,"abstract":"The Bark of Marpuyan Tree (Rhodamnia cinerea Jack) is a plant that has been empirically used by communities in Indonesia for the treatment of infectious diseases caused by bacteria and fungi. The bark of Marpuyan contains flavonoids, phenolics, and saponins. This study aimed to evaluate the antibacterial and antifungal activities of the ethanol extract of the bark of Marpuyan using the disc diffusion method at various extract concentrations, namely 30%, 25%, 15%, 10%, and 5%. The results of the antibacterial activity test against Gram-positive bacteria (Staphylococcus aureus, Staphylococcus epidermidis, and Bacillus subtilis) showed inhibitory zones with respective diameters of 11.67±0.21 mm, 12.29±0.43 mm, and 12.78±0.14 mm. These results indicate weak antibacterial activity. In the antibacterial activity test against Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, and Salmonella typhi), inhibitory zones were found with respective diameters of 13.05±0.05 mm, 12.58±1.78 mm, and 10.98±0.21 mm. These results also indicate weak antibacterial activity. However, in the antifungal activity test, no activity was found against Candida albicans and Malassezia furfur. Nevertheless, the ethanol extract of Marpuyan bark showed moderate antifungal activity against Trichophyton mentagrophytes, with an inhibitory zone diameter of 15.44±2.02 mm.","PeriodicalId":7071,"journal":{"name":"Acta Chimica Asiana","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140684352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Laily Aulia Agustina, Y. Lestari, Arrival Arsyad Adhinanda, Muhammad Naufal Ariesta, Jonghyun Choi, Y. P. Prananto, Rakhma Febriani
Slip migration must be controlled to maintain the performance and quality of flexible packaging. Inorganic based anti-block materials can be used to control the slip migration. This paper reported the effect of anti-block type on the inhibition of slip migration on polyethylene monolayer film. A series of formulations were made with three different anti-block additives, namely talc, natural silica, and synthetic silica, along with erucamide. The optical properties (haze) and friction properties (COF) were measured to assess the film characteristics as the development of slip migration in the presence of anti-block additives. Characterization of the anti-block material was conducted by SEM-EDX, slip additive type was examined by GC-MS, while the slip content on the surface was analysed by FTIR. The result showed that after seven days, synthetic silica anti-block gives COF up to 0.095, with the trace erucamide content on the film surface of 394 ppm, the lowest amongst other types of the anti-block used. The smaller particle size and higher silica content on synthetic silica anti-block resulted in better friction properties which act as a good barrier to limit a migration of erucamide onto the film surface.
{"title":"Study of inorganic based anti-blocks as migration control of slip additive on surface polyethylene monolayer film","authors":"Laily Aulia Agustina, Y. Lestari, Arrival Arsyad Adhinanda, Muhammad Naufal Ariesta, Jonghyun Choi, Y. P. Prananto, Rakhma Febriani","doi":"10.29303/aca.v7i1.196","DOIUrl":"https://doi.org/10.29303/aca.v7i1.196","url":null,"abstract":"Slip migration must be controlled to maintain the performance and quality of flexible packaging. Inorganic based anti-block materials can be used to control the slip migration. This paper reported the effect of anti-block type on the inhibition of slip migration on polyethylene monolayer film. A series of formulations were made with three different anti-block additives, namely talc, natural silica, and synthetic silica, along with erucamide. The optical properties (haze) and friction properties (COF) were measured to assess the film characteristics as the development of slip migration in the presence of anti-block additives. Characterization of the anti-block material was conducted by SEM-EDX, slip additive type was examined by GC-MS, while the slip content on the surface was analysed by FTIR. The result showed that after seven days, synthetic silica anti-block gives COF up to 0.095, with the trace erucamide content on the film surface of 394 ppm, the lowest amongst other types of the anti-block used. The smaller particle size and higher silica content on synthetic silica anti-block resulted in better friction properties which act as a good barrier to limit a migration of erucamide onto the film surface.","PeriodicalId":7071,"journal":{"name":"Acta Chimica Asiana","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140685289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
BN compounds play an important role in the preparation of hyper- thin films, that have received signifcant attention in products. In this article, we investigated the electronic structures of and. Triatomic NBN and BNB have recently been studied using various experimental and calculation approaches, and it is totally agreed that both of them are linear in their ground electronic step. The six ions including B2N (-), B2N (+), B2N (0) , BN2 (-), BN2 (+) and BN2 (0) have been studied and been also compared with one another in terms of several basis sets and predication of the symmetry breaking (SB) subject. Artifactual SB with the v3 vibration is occurred in the trial wave functions of coupled-cluster level, even when Brueckner orbitals of all nitrogen and oxygen atoms are used. In the of and molecules, the unpaired electrons are delocalized, while in the asymmetric, they are localized on either one of the B atoms or N atoms of and , respectively. Structures with (SB),, can be stronger by interaction to the . Hereby, the second-order Jahn-Teller effect allows the unpaired electron to localize on boron atom, rather than being delocalized. Finally, from a statistical thermodynamical analysis, we calculated the thermodynamically stabilities of those six ions.
{"title":"Quantum Dynamic Approach of B2N(∓,0) and N2B (∓,0) Clusters Study: A Symmetry Breaking due to the Jahn-Teller Effect","authors":"Majid Monajjemi","doi":"10.29303/aca.v7i1.168","DOIUrl":"https://doi.org/10.29303/aca.v7i1.168","url":null,"abstract":"BN compounds play an important role in the preparation of hyper- thin films, that have received signifcant attention in products. In this article, we investigated the electronic structures of and. Triatomic NBN and BNB have recently been studied using various experimental and calculation approaches, and it is totally agreed that both of them are linear in their ground electronic step. The six ions including B2N (-), B2N (+), B2N (0) , BN2 (-), BN2 (+) and BN2 (0) have been studied and been also compared with one another in terms of several basis sets and predication of the symmetry breaking (SB) subject. Artifactual SB with the v3 vibration is occurred in the trial wave functions of coupled-cluster level, even when Brueckner orbitals of all nitrogen and oxygen atoms are used. In the of and molecules, the unpaired electrons are delocalized, while in the asymmetric, they are localized on either one of the B atoms or N atoms of and , respectively. Structures with (SB),, can be stronger by interaction to the . Hereby, the second-order Jahn-Teller effect allows the unpaired electron to localize on boron atom, rather than being delocalized. Finally, from a statistical thermodynamical analysis, we calculated the thermodynamically stabilities of those six ions.","PeriodicalId":7071,"journal":{"name":"Acta Chimica Asiana","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140691674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sri Hilma Siregar, Hasmalina Nasution, Wirdati Irma, Dedi Suwito, Aulia Rahmadani, Sha-Ling Han
Industri pulp dan kertas di Indonesia mengalami perkembangan yang cukup pesat. Industri ini menghasilkan limbah biomassa dalam jumlah besar yang memiliki potensi mencemari lingkungan. Beberapa tipe biomassa yang tersedia di pabrik pulp antara lain lindi hitam (black liquor), kulit kayu (bark), residu kayu, mata kayu (knot), reject pulp dan sludge cake. Dalam penelitian ini limbah biomassa reject pulp dapat di jadikan sebagai bahan alternatif, untuk mengurangi zat warna metilen biru. Penelitian ini mempelajari tentang kemampuan karbon reject pulp yang di karbonisasi pada suhu 450°C sebagai adsorben dalam mengadsorpsi zat warna metilen biru dengan metode spectrofotometri UV-Vis, dan karakterisasi menggunakan X- Ray Diffraction (XRD). Variabel yang digunakan dalam penelitian ini adalah pH 3-11, waktu kontak 15-90 menit, massa adsorben 0,1-1.0 gr. Hasil optimal pada penelitian ini yaitu pada pH 5 dengan persentase 57,34 %, waktu kontak optimum pada 75 menit dengan persentase 67,34 %, massa adsorben optimum 1,0 gr.
{"title":"Sintesis Dan Karakterisasi Karbon Aktif Dari Limbah Biomassa Reject Pulp Sebagai Adsorben Zat Warna","authors":"Sri Hilma Siregar, Hasmalina Nasution, Wirdati Irma, Dedi Suwito, Aulia Rahmadani, Sha-Ling Han","doi":"10.29303/aca.v6i2.164","DOIUrl":"https://doi.org/10.29303/aca.v6i2.164","url":null,"abstract":"Industri pulp dan kertas di Indonesia mengalami perkembangan yang cukup pesat. Industri ini menghasilkan limbah biomassa dalam jumlah besar yang memiliki potensi mencemari lingkungan. Beberapa tipe biomassa yang tersedia di pabrik pulp antara lain lindi hitam (black liquor), kulit kayu (bark), residu kayu, mata kayu (knot), reject pulp dan sludge cake. Dalam penelitian ini limbah biomassa reject pulp dapat di jadikan sebagai bahan alternatif, untuk mengurangi zat warna metilen biru. Penelitian ini mempelajari tentang kemampuan karbon reject pulp yang di karbonisasi pada suhu 450°C sebagai adsorben dalam mengadsorpsi zat warna metilen biru dengan metode spectrofotometri UV-Vis, dan karakterisasi menggunakan X- Ray Diffraction (XRD). Variabel yang digunakan dalam penelitian ini adalah pH 3-11, waktu kontak 15-90 menit, massa adsorben 0,1-1.0 gr. Hasil optimal pada penelitian ini yaitu pada pH 5 dengan persentase 57,34 %, waktu kontak optimum pada 75 menit dengan persentase 67,34 %, massa adsorben optimum 1,0 gr.","PeriodicalId":7071,"journal":{"name":"Acta Chimica Asiana","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75732468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Riyadh Aqilsya Amaryl Dyas, Bambang Wijianto, H. Ih
Alpha (a) and beta (β) asarone were identified as the main compounds of red Jeringau (Acorus calamus L.) and had antimicrobial properties. This study aimed to know these two compounds' antibacterial mechanism and toxicity prediction against the PBP 2 protein and 50S Ribosomal Protein of Shigella flexneri. Molecular docking protocol using PyRx device was performed with Exhaustiveness value= 106, grid x=38.738375, y=112.645792, z=46.926417 for PBP2, and grid x=71.721251, y=47.551601, z=9.663173 for 50S Ribosomal Protein. The molecular docking results on the α -Asarone compound obtained an affinity value of -5.7 kcal/mol for PBP2 and an affinity value of -5.6 kcal/mol for 50S Ribosomal Protein. In comparison, β-Asarone had an affinity value of -5.6 kcal/mol to PBP2 and an affinity value of -5.7 kcal/mol for 50S Ribosomal Protein. The α and β-Asarone affinity had better values than the control. Molecular docking of α and β-Asarone compounds results in ionic bonds to the TYR529 amino acid and polar bonds to the ASN552 amino acid of PBP2. However, only β-Asarone produces ionic bonds at the amino acid ILE17 and polar bonds at GLU13 from 50S Ribosomal Protein. Based on this study, the α and β-Asarone compounds were shown to have antibacterial activity by interfering with the permeability of the bacterial cell wall. Both compounds are also predicted to have carcinogenic and mutagen effects.
{"title":"Docking studies for screening antibacterial compounds of Red Jeringau (Acorus calamus L.) using Shigella flexneri protein as a model system","authors":"Riyadh Aqilsya Amaryl Dyas, Bambang Wijianto, H. Ih","doi":"10.29303/aca.v6i2.161","DOIUrl":"https://doi.org/10.29303/aca.v6i2.161","url":null,"abstract":"Alpha (a) and beta (β) asarone were identified as the main compounds of red Jeringau (Acorus calamus L.) and had antimicrobial properties. This study aimed to know these two compounds' antibacterial mechanism and toxicity prediction against the PBP 2 protein and 50S Ribosomal Protein of Shigella flexneri. Molecular docking protocol using PyRx device was performed with Exhaustiveness value= 106, grid x=38.738375, y=112.645792, z=46.926417 for PBP2, and grid x=71.721251, y=47.551601, z=9.663173 for 50S Ribosomal Protein. The molecular docking results on the α -Asarone compound obtained an affinity value of -5.7 kcal/mol for PBP2 and an affinity value of -5.6 kcal/mol for 50S Ribosomal Protein. In comparison, β-Asarone had an affinity value of -5.6 kcal/mol to PBP2 and an affinity value of -5.7 kcal/mol for 50S Ribosomal Protein. The α and β-Asarone affinity had better values than the control. Molecular docking of α and β-Asarone compounds results in ionic bonds to the TYR529 amino acid and polar bonds to the ASN552 amino acid of PBP2. However, only β-Asarone produces ionic bonds at the amino acid ILE17 and polar bonds at GLU13 from 50S Ribosomal Protein. Based on this study, the α and β-Asarone compounds were shown to have antibacterial activity by interfering with the permeability of the bacterial cell wall. Both compounds are also predicted to have carcinogenic and mutagen effects.","PeriodicalId":7071,"journal":{"name":"Acta Chimica Asiana","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90516022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Decorating of Transition metals (TMs) on the "AlMg" nanoalloy has been studied on the basis of Langmuir adsorption applying "ONIOM" model with three levels of «high, medium and low» by using "LANL2DZ /6-31+G(d,p)/EPR-III", "semi-empirical" and "MM2" functions. The fluctuation of "NQR" has estimated the inhibiting role of pyridine and alkylpyridines containing 2-picoline (2Pic), 3-picoline (3Pic) ,4-picoline (4Pic), and 2,4-lutidine (24Lut) for (Sc, Ti, Cr, Ni, Cu, Zn)-doped AlMg alloy nanosheet due to "N" atom in the benzene cycle of heterocyclic carbenes being near the monolayer surface of ternary "TM–(Al–Mg)" (TM= Sc, Ti, Cr, Ni, Cu, Zn) nanoalloys. The "NMR" spectroscopy has remarked In fact, the NMR results of the adsorption of pyridine and alkylpyridines of 2Pic, 3Pic, 4Pic and 24Lut molecules represent spin polarization on the TM (Sc, Ti, Cr, Ni, Cu, Zn)-doped Al–Mg nanoalloy surfaces that these surfaces can be employed as the magnetic N-heterocyclic carbene sensors. In fact, "TM" sites in "TM–(Al–Mg)" nanoalloy surfaces have bigger interaction energy amount from "Van der Waals’ forces" with pyridine and its nitrogen heterocyclic family that might cause them large stable towards coating data on the nanosurface. It has been estimated that the criterion for choosing the surface linkage of "N" atom in pyridine and alkylpyridines in adsorption sites can be impacted by the existence of close atoms of aluminum and magnesium in the "TM–(AlMg)" surfaces. Moreover, "IR" spectroscopy has exhibited that (Sc, Ti, Cr, Ni, Cu, Zn)-doped AlMg alloy nanosheet with the fluctuation in the frequency of intra-atomic interaction leads us to the most considerable influence in the vicinage elements generated due to inter-atomic interaction. Comparison to amounts versus dipole moment has illustrated a proper accord among measured parameters based on the rightness of the chosen isotherm for the adsorption steps of the formation of Py@Sc–(Al–Mg), Py@Ti–(Al–Mg), Py@Cr–(Al–Mg), Py@Ni–(Al–Mg), Py@Cu–(Al–Mg), and Py@Zn–(Al–Mg) complexes. Thus, the interval between nitrogen atom in pyridine during interaction with transition metals of "Sc, Ti, Cr, Ni, Cu, Zn" in "TM–(Al–Mg)" nanoalloys, (N→TM), has been estimated with relation coefficient of R² = 0.9284. Thus, the present has exhibit the influence of "TMs" doped on the "Al–Mg" surface for adsorption of N-heterocyclic carbenes of pyridine and alkylpyridines by using theoretical methods.
{"title":"Increasing corrosion resistance of binary Al-Alloy through implanting with some transition elements and heteroatom organic compounds","authors":"Fatemeh Mollaamin","doi":"10.29303/aca.v6i2.166","DOIUrl":"https://doi.org/10.29303/aca.v6i2.166","url":null,"abstract":"Decorating of Transition metals (TMs) on the \"AlMg\" nanoalloy has been studied on the basis of Langmuir adsorption applying \"ONIOM\" model with three levels of «high, medium and low» by using \"LANL2DZ /6-31+G(d,p)/EPR-III\", \"semi-empirical\" and \"MM2\" functions. The fluctuation of \"NQR\" has estimated the inhibiting role of pyridine and alkylpyridines containing 2-picoline (2Pic), 3-picoline (3Pic) ,4-picoline (4Pic), and 2,4-lutidine (24Lut) for (Sc, Ti, Cr, Ni, Cu, Zn)-doped AlMg alloy nanosheet due to \"N\" atom in the benzene cycle of heterocyclic carbenes being near the monolayer surface of ternary \"TM–(Al–Mg)\" (TM= Sc, Ti, Cr, Ni, Cu, Zn) nanoalloys. The \"NMR\" spectroscopy has remarked In fact, the NMR results of the adsorption of pyridine and alkylpyridines of 2Pic, 3Pic, 4Pic and 24Lut molecules represent spin polarization on the TM (Sc, Ti, Cr, Ni, Cu, Zn)-doped Al–Mg nanoalloy surfaces that these surfaces can be employed as the magnetic N-heterocyclic carbene sensors. In fact, \"TM\" sites in \"TM–(Al–Mg)\" nanoalloy surfaces have bigger interaction energy amount from \"Van der Waals’ forces\" with pyridine and its nitrogen heterocyclic family that might cause them large stable towards coating data on the nanosurface. It has been estimated that the criterion for choosing the surface linkage of \"N\" atom in pyridine and alkylpyridines in adsorption sites can be impacted by the existence of close atoms of aluminum and magnesium in the \"TM–(AlMg)\" surfaces. Moreover, \"IR\" spectroscopy has exhibited that (Sc, Ti, Cr, Ni, Cu, Zn)-doped AlMg alloy nanosheet with the fluctuation in the frequency of intra-atomic interaction leads us to the most considerable influence in the vicinage elements generated due to inter-atomic interaction. Comparison to amounts versus dipole moment has illustrated a proper accord among measured parameters based on the rightness of the chosen isotherm for the adsorption steps of the formation of Py@Sc–(Al–Mg), Py@Ti–(Al–Mg), Py@Cr–(Al–Mg), Py@Ni–(Al–Mg), Py@Cu–(Al–Mg), and Py@Zn–(Al–Mg) complexes. Thus, the interval between nitrogen atom in pyridine during interaction with transition metals of \"Sc, Ti, Cr, Ni, Cu, Zn\" in \"TM–(Al–Mg)\" nanoalloys, (N→TM), has been estimated with relation coefficient of R² = 0.9284. Thus, the present has exhibit the influence of \"TMs\" doped on the \"Al–Mg\" surface for adsorption of N-heterocyclic carbenes of pyridine and alkylpyridines by using theoretical methods.","PeriodicalId":7071,"journal":{"name":"Acta Chimica Asiana","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86431012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Freeport Indonesia is one of Freeport-McMoRan Copper & Gold Inc. affiliate companies. Freeport Indonesia conducted a series of mining and exploration processes for ore containing gold, silver, and copper. Grasberg is the mining location in PT Freeport, Indonesia. This research aimed to determine the distribution of gold (Au) particles in Grasberg rock samples with relatively high gold content. The method used for analyzing the gold content was Fire Assay. The research results indicated that the sample size affected the gold distribution in Grasberg Mine samples. An uneven distribution tendency of gold was observed in the distribution comparison of Splitter and Screen variations with normal Au content.
{"title":"Evaluation of gold (au) particle distribution in Grasberg mine material of Freeport Indonesia: fire assay approach","authors":"Akram La Kilo, Ishak Isa, Muhammad Taufiq Nur","doi":"10.29303/aca.v6i2.165","DOIUrl":"https://doi.org/10.29303/aca.v6i2.165","url":null,"abstract":"Freeport Indonesia is one of Freeport-McMoRan Copper & Gold Inc. affiliate companies. Freeport Indonesia conducted a series of mining and exploration processes for ore containing gold, silver, and copper. Grasberg is the mining location in PT Freeport, Indonesia. This research aimed to determine the distribution of gold (Au) particles in Grasberg rock samples with relatively high gold content. The method used for analyzing the gold content was Fire Assay. The research results indicated that the sample size affected the gold distribution in Grasberg Mine samples. An uneven distribution tendency of gold was observed in the distribution comparison of Splitter and Screen variations with normal Au content.","PeriodicalId":7071,"journal":{"name":"Acta Chimica Asiana","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88808354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Sudirman, Lalu Dimas Pratama Atmaja, Ari Jamhari Pratama, E. Yuanita, N. K. T. Dharmayani, M. Ulfa, Romel Hidayat
The synthesis of environmentally friendly-based chemicals such as solvent-free continues to be developed. A critical precursor in chemical synthesis is benzoic acid. This research developed a synthesis method by utilizing TiO2 nanomaterials with different morphologies as photocatalysts, namely nanoparticles (NPs) and nanowires (NWs). Titanium (IV) oxide with nanowires morphology was synthesized by hydrothermal method under alkaline conditions. SEM, XRD, and FT-IR images confirmed the morphologies of TiO2 NPs and TiO2 NWs. Photocatalytic performance in converting benzaldehyde to benzoic acid showed a significant difference of up to 38% using TiO2 NPs and 94% using TiO2 NWs.
{"title":"Highly photocatalytic performance of TiO2 nanowires in the conversion of benzaldehydes to benzoic acid","authors":"S. Sudirman, Lalu Dimas Pratama Atmaja, Ari Jamhari Pratama, E. Yuanita, N. K. T. Dharmayani, M. Ulfa, Romel Hidayat","doi":"10.29303/aca.v6i2.160","DOIUrl":"https://doi.org/10.29303/aca.v6i2.160","url":null,"abstract":"The synthesis of environmentally friendly-based chemicals such as solvent-free continues to be developed. A critical precursor in chemical synthesis is benzoic acid. This research developed a synthesis method by utilizing TiO2 nanomaterials with different morphologies as photocatalysts, namely nanoparticles (NPs) and nanowires (NWs). Titanium (IV) oxide with nanowires morphology was synthesized by hydrothermal method under alkaline conditions. SEM, XRD, and FT-IR images confirmed the morphologies of TiO2 NPs and TiO2 NWs. Photocatalytic performance in converting benzaldehyde to benzoic acid showed a significant difference of up to 38% using TiO2 NPs and 94% using TiO2 NWs.","PeriodicalId":7071,"journal":{"name":"Acta Chimica Asiana","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84789440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study examines the design of a heat exchanger (HE) in the production process of nickel ferrite (NiFe2O4) nanoparticles using the coprecipitation method by determining the shell and tube heat exchanger. The Microsoft Excel application is used as a manual calculating machine to facilitate the analysis of heat exchanger (HE) data calculations. The research flowchart starts with a literature study, preparation of tools and materials for design, calculation of the main shell and tube components, and then fabrication. Based on the calculation results, the design specification data for a shell and tube heat exchanger has a shell diameter of 0.032 m, a shell length of 4.267 mm, a thickness of 0.002 m with an initial heat transfer rate (Q) of 460130 W resulting in a heat transfer efficiency of 95.706% and an NTU of 6.165. The high effectiveness value makes the design of the one shell and tube type turbulent flow heat exchanger (HE) considered to have met the standards of high effectiveness and good performance. The design and design process is complete if the device functions properly. This study can be used as a reference for researchers in designing heat exchangers during production to make them more effective, reliable, and economical.
{"title":"Design of heat exchanger for producing nickel ferrite (NiFe2O4) nanoparticles using coprecipitation method","authors":"Sifa Aulia Rahma, A. Nandiyanto, Teguh Kurniawan","doi":"10.29303/aca.v6i2.144","DOIUrl":"https://doi.org/10.29303/aca.v6i2.144","url":null,"abstract":"This study examines the design of a heat exchanger (HE) in the production process of nickel ferrite (NiFe2O4) nanoparticles using the coprecipitation method by determining the shell and tube heat exchanger. The Microsoft Excel application is used as a manual calculating machine to facilitate the analysis of heat exchanger (HE) data calculations. The research flowchart starts with a literature study, preparation of tools and materials for design, calculation of the main shell and tube components, and then fabrication. Based on the calculation results, the design specification data for a shell and tube heat exchanger has a shell diameter of 0.032 m, a shell length of 4.267 mm, a thickness of 0.002 m with an initial heat transfer rate (Q) of 460130 W resulting in a heat transfer efficiency of 95.706% and an NTU of 6.165. The high effectiveness value makes the design of the one shell and tube type turbulent flow heat exchanger (HE) considered to have met the standards of high effectiveness and good performance. The design and design process is complete if the device functions properly. This study can be used as a reference for researchers in designing heat exchangers during production to make them more effective, reliable, and economical.","PeriodicalId":7071,"journal":{"name":"Acta Chimica Asiana","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72896882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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