Phyllanthus emblica fruit has diuretic, antibacterial, hepatoprotective, antitumor, hypocholesterolemic, antioxidant, and antiulcerogenic activities making it possible as a traditional medicine in capsule form. Capsule preparations have the advantage of covering the unpleasant taste and smell of medicinal ingredients, easy to swallow, so they are practical to use. This study aimed to formulate Phyllanthus emblica fruit nanoparticles in capsules and to test the antibacterial activity against Streptococcus mutans and Pseudomonas aeruginosa and anti-inflammatory activity by observing denaturation inhibition in vitro. The method used to manufacture Phyllanthus emblica fruit simplicia nanoparticles was used using a High Energy Ball mill grinding machine. Capsule formulation was carried out with various doses of nanoparticles (100, 150, and 200 mg). Evaluation includes weight uniformity and disintegration time. Test of its antibacterial activity against Streptococcus mutans and Pseudomonas aeruginosa and its anti inflammatory activity in vitro. The study found that all formulas could be made into capsules that met the evaluation test requirements. The results of the evaluation of disintegration time ranged from 6.17-11.33 minutes. For the evaluation results of weight uniformity, it was found that weight deviations in columns A1 and A2 were in the range between 0.9% to 2.8% and 0.9 to 1.3%. The study reports on the antibacterial activity of Phyllanthus emblica fruit nanoparticle capsules (PFNP) against Streptococcus mutans and Pseudomonas aeruginosa. The results indicate that PFNP exhibits a dose-dependent antibacterial effect, with inhibition zone diameters of 10.83 mm, 11.6 mm, and 12.63 mm observed at 100 mg, 150 mg, and 200 mg, respectively, against Streptococcus mutans. Similarly, PFNP demonstrated a dose-dependent antibacterial effect against Pseudomonas aeruginosa, with inhibition zone diameters of 10.7 mm, 11.4 mm, and 12.1 mm observed at doses of 100 mg, 150 mg, and 200 mg, respectively. PFNP capsules showed inhibition results with a value of 5.63%, 6.13%, and 6.80%. It was concluded that Phyllanthus emblica fruit nanoparticles (Phyllanthus emblica L.) could be formulated in capsule dosage forms with doses of 100 mg, 150 mg, and 200 mg; has antibacterial activity against Streptococcus mutans and Pseudomonas aeruginosa, and has no anti-inflammatory activity.
{"title":"Formulation and Evaluation of Antibacterial and Anti-Inflammatory Capsules Containing Phyllanthus emblica L. Fruit Nanoparticles","authors":"Masfria Masfria, Sumaiyah Sumaiyah, Hafid Syahputra, Marwin Witarman","doi":"10.26554/sti.2023.8.4.607-615","DOIUrl":"https://doi.org/10.26554/sti.2023.8.4.607-615","url":null,"abstract":"Phyllanthus emblica fruit has diuretic, antibacterial, hepatoprotective, antitumor, hypocholesterolemic, antioxidant, and antiulcerogenic activities making it possible as a traditional medicine in capsule form. Capsule preparations have the advantage of covering the unpleasant taste and smell of medicinal ingredients, easy to swallow, so they are practical to use. This study aimed to formulate Phyllanthus emblica fruit nanoparticles in capsules and to test the antibacterial activity against Streptococcus mutans and Pseudomonas aeruginosa and anti-inflammatory activity by observing denaturation inhibition in vitro. The method used to manufacture Phyllanthus emblica fruit simplicia nanoparticles was used using a High Energy Ball mill grinding machine. Capsule formulation was carried out with various doses of nanoparticles (100, 150, and 200 mg). Evaluation includes weight uniformity and disintegration time. Test of its antibacterial activity against Streptococcus mutans and Pseudomonas aeruginosa and its anti inflammatory activity in vitro. The study found that all formulas could be made into capsules that met the evaluation test requirements. The results of the evaluation of disintegration time ranged from 6.17-11.33 minutes. For the evaluation results of weight uniformity, it was found that weight deviations in columns A1 and A2 were in the range between 0.9% to 2.8% and 0.9 to 1.3%. The study reports on the antibacterial activity of Phyllanthus emblica fruit nanoparticle capsules (PFNP) against Streptococcus mutans and Pseudomonas aeruginosa. The results indicate that PFNP exhibits a dose-dependent antibacterial effect, with inhibition zone diameters of 10.83 mm, 11.6 mm, and 12.63 mm observed at 100 mg, 150 mg, and 200 mg, respectively, against Streptococcus mutans. Similarly, PFNP demonstrated a dose-dependent antibacterial effect against Pseudomonas aeruginosa, with inhibition zone diameters of 10.7 mm, 11.4 mm, and 12.1 mm observed at doses of 100 mg, 150 mg, and 200 mg, respectively. PFNP capsules showed inhibition results with a value of 5.63%, 6.13%, and 6.80%. It was concluded that Phyllanthus emblica fruit nanoparticles (Phyllanthus emblica L.) could be formulated in capsule dosage forms with doses of 100 mg, 150 mg, and 200 mg; has antibacterial activity against Streptococcus mutans and Pseudomonas aeruginosa, and has no anti-inflammatory activity.","PeriodicalId":21644,"journal":{"name":"Science and Technology Indonesia","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135409053","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}
Acid mine drainage (AMD) is a significant threat to the environment due to its high acidity and metal ion content. To effectively eliminate pollutants from AMD, various approaches are necessary. This review aims to provide a comprehensive understanding of recent advances in AMD mitigation. While treatment technologies have developed to eliminate AMD, they often produce sludge as a by-product and require expensive maintenance. As a cost-effective alternative, the recovery of AMD resources can reduce toxicity and promote reuse of heavy metals and rare earth elements. This review also analyzes the challenges and prospects of AMD mitigation implementation, including current mitigation conditions and knowledge gaps. Researchers can benefit from this review by gaining insight into research progress in this area, identifying strengths and weaknesses of current AMD mitigation applications, and exploring future research directions.
{"title":"Emerging Strategies for Mitigating Acid Mine Drainage Formation and Environmental Impacts: A Comprehensive Review of Recent Advances","authors":"Yudha Gusti Wibowo, Muhammad Fauzul Imron, Setyo Budi Kurniawan, Bimastyaji Surya Ramadan, Tarmizi Taher, Alvian Hayu Sudibya, Hutwan Syarifuddin, Khairurrijal Khairurrijal, Jarwinda Jarwinda","doi":"10.26554/sti.2023.8.4.516-541","DOIUrl":"https://doi.org/10.26554/sti.2023.8.4.516-541","url":null,"abstract":"Acid mine drainage (AMD) is a significant threat to the environment due to its high acidity and metal ion content. To effectively eliminate pollutants from AMD, various approaches are necessary. This review aims to provide a comprehensive understanding of recent advances in AMD mitigation. While treatment technologies have developed to eliminate AMD, they often produce sludge as a by-product and require expensive maintenance. As a cost-effective alternative, the recovery of AMD resources can reduce toxicity and promote reuse of heavy metals and rare earth elements. This review also analyzes the challenges and prospects of AMD mitigation implementation, including current mitigation conditions and knowledge gaps. Researchers can benefit from this review by gaining insight into research progress in this area, identifying strengths and weaknesses of current AMD mitigation applications, and exploring future research directions.","PeriodicalId":21644,"journal":{"name":"Science and Technology Indonesia","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136115458","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}
Research on the synthesis of Pt-Porous Composite Material (Pt-PCM) has been done. This material is used for the electrochemical activity of uric acid and electrochemical synthesis of acetic acid from ethanol. Pt-PCM is made by mixing 99.995% platinum powder and PVC or Poly (vinyl chloride) homogeneously with a homogenizer for 3.0 h, plus tetrahydrofuran solvent, and pressed with a strength of 10 tons/cm2. The material produced was analysis using Scanning Electron Microscopy (SEM), voltammetry potential V and Tafel plot. The material is used as an electrode for the determination of uric acid and the synthesis of acetic acid from ethanol. The results showed that Pt-PCM has evenly distributed pores and has a perfect Tafel slope compared to metal platinum or solid platinum. Pt-PCM also has the excellent ability as a working electrode for the analysis of uric acid in human urine and electro synthetic acetic acid from alcohol. In conclusion, Pt-Porous Composite Material (Pt-PCM) is a porous material, so it is excellent as a candidate for electrodes.
{"title":"Modification of Pt-Porous Composite Material (Pt-PCM) and Its Application for Electroanalysis of Uric Acid and Electrosynthesis of Acetic Acid from Ethanol","authors":"Riyanto Riyanto, Nurhasanah Nurhasanah, Mohamed Rozali Othman","doi":"10.26554/sti.2023.8.4.554-559","DOIUrl":"https://doi.org/10.26554/sti.2023.8.4.554-559","url":null,"abstract":"Research on the synthesis of Pt-Porous Composite Material (Pt-PCM) has been done. This material is used for the electrochemical activity of uric acid and electrochemical synthesis of acetic acid from ethanol. Pt-PCM is made by mixing 99.995% platinum powder and PVC or Poly (vinyl chloride) homogeneously with a homogenizer for 3.0 h, plus tetrahydrofuran solvent, and pressed with a strength of 10 tons/cm2. The material produced was analysis using Scanning Electron Microscopy (SEM), voltammetry potential V and Tafel plot. The material is used as an electrode for the determination of uric acid and the synthesis of acetic acid from ethanol. The results showed that Pt-PCM has evenly distributed pores and has a perfect Tafel slope compared to metal platinum or solid platinum. Pt-PCM also has the excellent ability as a working electrode for the analysis of uric acid in human urine and electro synthetic acetic acid from alcohol. In conclusion, Pt-Porous Composite Material (Pt-PCM) is a porous material, so it is excellent as a candidate for electrodes.","PeriodicalId":21644,"journal":{"name":"Science and Technology Indonesia","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135406736","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}
Pub Date : 2023-10-01DOI: 10.26554/sti.2023.8.4.691-700
Suhadi Suhadi, Iskhaq Iskandar, Supari Supari, Muhammad Irfan, Hamdi Akhsan
Even though Sumatra is very vulnerable to the effects of drought, research identifying drought on this island is very limited, especially extreme drought. This research was conducted to identify extreme drought in Sumatra using the Standardized Precipitation Index (SPI) and the Effective Drought Index (EDI). This study uses precipitation data from the Indonesian Meteorology, Climatology and Geophysics Agency (BMKG) and Global Precipitation Climatology Center (GPCC) reanalysis data. The composite indices were conducted to discover some phenomena that cause the drought based on El Niño and positive Indian Ocean Dipole (IOD) events. The results showed that the El Niño and positive IOD phenomena were more likely to influence extreme droughts. However, the droughts in 2014 and 2008 tended to be influenced by the negative Sea Surface Temperature anomaly (SSTA). The spatial analysis results show that the areas that experience extreme drought more often are the west coast of Sumatra (except Aceh province), especially based on SPI12 and EDI. The composite indices results show that the drought that occurred in Aceh province was more influenced by the El Niño phenomenon in the December-January-February (DJF) period and the positive IOD in the June-July-August (JJA) – September-October-November (SON) period. In addition, Aceh province is an area that is not affected by El Niño-positive IOD, especially during the SON-DJF period. These results can be used to mitigate drought, especially when El Niño-positive IOD phenomena cause it.
{"title":"Extreme Drought Assessment in Sumatra-Indonesia Using SPI and EDI","authors":"Suhadi Suhadi, Iskhaq Iskandar, Supari Supari, Muhammad Irfan, Hamdi Akhsan","doi":"10.26554/sti.2023.8.4.691-700","DOIUrl":"https://doi.org/10.26554/sti.2023.8.4.691-700","url":null,"abstract":"Even though Sumatra is very vulnerable to the effects of drought, research identifying drought on this island is very limited, especially extreme drought. This research was conducted to identify extreme drought in Sumatra using the Standardized Precipitation Index (SPI) and the Effective Drought Index (EDI). This study uses precipitation data from the Indonesian Meteorology, Climatology and Geophysics Agency (BMKG) and Global Precipitation Climatology Center (GPCC) reanalysis data. The composite indices were conducted to discover some phenomena that cause the drought based on El Niño and positive Indian Ocean Dipole (IOD) events. The results showed that the El Niño and positive IOD phenomena were more likely to influence extreme droughts. However, the droughts in 2014 and 2008 tended to be influenced by the negative Sea Surface Temperature anomaly (SSTA). The spatial analysis results show that the areas that experience extreme drought more often are the west coast of Sumatra (except Aceh province), especially based on SPI12 and EDI. The composite indices results show that the drought that occurred in Aceh province was more influenced by the El Niño phenomenon in the December-January-February (DJF) period and the positive IOD in the June-July-August (JJA) – September-October-November (SON) period. In addition, Aceh province is an area that is not affected by El Niño-positive IOD, especially during the SON-DJF period. These results can be used to mitigate drought, especially when El Niño-positive IOD phenomena cause it.","PeriodicalId":21644,"journal":{"name":"Science and Technology Indonesia","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135406742","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}
Pub Date : 2023-10-01DOI: 10.26554/sti.2023.8.4.654-659
Eka Susanti, Fitri Maya Puspita, Siti Suzlin Supadi, Evi Yuliza, Ahmad Farhan Ramadhan
The inventory model is used to determine the optimal inventory of a product. In certain cases, parameters in the inventory model are uncertain. Fractal interpolation techniques can be used to overcome parameter with uncertainty. Fractal interpolation results are affected by the fractal interpolation function and the vertical scaling factor. The vertical scaling factor is positive and less than 1. In this study, fractal interpolation techniques are introduced with variations in vertical scaling factor to overcome the uncertainty of demand data in inventory models. Furthermore, the interpolation results are used in fuzzy inventory models and expressed by Trapezoidal Fuzzy Number. This paper considers an inventory model with varying demand to optimize rice inventory. Based on the data obtained, the accuracy level will increase for the vertical scaling factor values close to 1. Optimal rice inventory of each successive fuzzy parameter is 1447963, 1013914, 504950, 215312. If the cost parameter is increased, then the amount of inventory is decreases.
{"title":"Improve Fuzzy Inventory Model of Fractal Interpolation with Vertical Scaling Factor","authors":"Eka Susanti, Fitri Maya Puspita, Siti Suzlin Supadi, Evi Yuliza, Ahmad Farhan Ramadhan","doi":"10.26554/sti.2023.8.4.654-659","DOIUrl":"https://doi.org/10.26554/sti.2023.8.4.654-659","url":null,"abstract":"The inventory model is used to determine the optimal inventory of a product. In certain cases, parameters in the inventory model are uncertain. Fractal interpolation techniques can be used to overcome parameter with uncertainty. Fractal interpolation results are affected by the fractal interpolation function and the vertical scaling factor. The vertical scaling factor is positive and less than 1. In this study, fractal interpolation techniques are introduced with variations in vertical scaling factor to overcome the uncertainty of demand data in inventory models. Furthermore, the interpolation results are used in fuzzy inventory models and expressed by Trapezoidal Fuzzy Number. This paper considers an inventory model with varying demand to optimize rice inventory. Based on the data obtained, the accuracy level will increase for the vertical scaling factor values close to 1. Optimal rice inventory of each successive fuzzy parameter is 1447963, 1013914, 504950, 215312. If the cost parameter is increased, then the amount of inventory is decreases.","PeriodicalId":21644,"journal":{"name":"Science and Technology Indonesia","volume":"161 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135406902","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}
Beluntas leaves contain flavonoids which have antioxidant effects. The purpose of this research was to determine the flavonoid total content, the effect of ethyl acetate fraction of beluntas on Malondialdehyde (MDA) levels, catalase enzyme activity, macroscopic pathology, histopathology description of white male rats wistar strain induced by CCl4 and of determining the best dose antioxidant. In this study, the in vivo tests used TBARS methods which consisted of six groups that are normal control, positive control (vitamin C 10 mg/kgBW), negative control (Na-CMC 1%), and treatment groups were given ethyl acetate fraction of beluntas leaves at doses 25 mg/kgBW, 50 mg/kgBW and 100 mg/kgBW. The total flavonoid content of the ethyl acetate fraction of beluntas leaves was 153 mgQE/g. The average results of MDA levels normal, positive, negative, doses fraction groups of 25, 50, and 100 mg/kgBW, respectively, were 1.155; 0.471; 1.892; 1.218; 0.826 and 0.512 nmol/mL. The average results of catalase enzyme activity of normal, positive, negative, doses fraction groups 25, 50, and 100 mg/kgBW, respectively, were 22.131; 40.489; 3.103; 14.145; 32.176, and 39.814 U/mL. The macroscopic and histopathology results show an improvement after being given the ethyl acetate fraction of beluntas leaves at doses of 25, 50, and 100 mg/kgBW compared to the negative control. The results showed that the ethyl acetate fraction of beluntas leaves reduce MDA levels and increases catalase enzyme activity. Ethyl acetate fraction of beluntas leaves at 100 mg/kgBW had the most potent antioxidant activity compared to doses of 25 and 50 mg/kgBB which were shown by Duncan’s statistical analysis that there was no significant difference with positive control.
{"title":"Antioxidant Activity Test of the Ethyl Acetate Fraction of Beluntas Leaves (Pluchea indica L.) in White Male Rats Wistar Strain Induced Carbon Tetra Chloride","authors":"Fitrya Fitrya, Vitri Agustiarini, Adelia Indriyan, Herlina Herlina, Dwi Hardestyariki, Eka Febri Zulissetiana","doi":"10.26554/sti.2023.8.4.599-606","DOIUrl":"https://doi.org/10.26554/sti.2023.8.4.599-606","url":null,"abstract":"Beluntas leaves contain flavonoids which have antioxidant effects. The purpose of this research was to determine the flavonoid total content, the effect of ethyl acetate fraction of beluntas on Malondialdehyde (MDA) levels, catalase enzyme activity, macroscopic pathology, histopathology description of white male rats wistar strain induced by CCl4 and of determining the best dose antioxidant. In this study, the in vivo tests used TBARS methods which consisted of six groups that are normal control, positive control (vitamin C 10 mg/kgBW), negative control (Na-CMC 1%), and treatment groups were given ethyl acetate fraction of beluntas leaves at doses 25 mg/kgBW, 50 mg/kgBW and 100 mg/kgBW. The total flavonoid content of the ethyl acetate fraction of beluntas leaves was 153 mgQE/g. The average results of MDA levels normal, positive, negative, doses fraction groups of 25, 50, and 100 mg/kgBW, respectively, were 1.155; 0.471; 1.892; 1.218; 0.826 and 0.512 nmol/mL. The average results of catalase enzyme activity of normal, positive, negative, doses fraction groups 25, 50, and 100 mg/kgBW, respectively, were 22.131; 40.489; 3.103; 14.145; 32.176, and 39.814 U/mL. The macroscopic and histopathology results show an improvement after being given the ethyl acetate fraction of beluntas leaves at doses of 25, 50, and 100 mg/kgBW compared to the negative control. The results showed that the ethyl acetate fraction of beluntas leaves reduce MDA levels and increases catalase enzyme activity. Ethyl acetate fraction of beluntas leaves at 100 mg/kgBW had the most potent antioxidant activity compared to doses of 25 and 50 mg/kgBB which were shown by Duncan’s statistical analysis that there was no significant difference with positive control.","PeriodicalId":21644,"journal":{"name":"Science and Technology Indonesia","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135408328","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}
Pub Date : 2023-10-01DOI: 10.26554/sti.2023.8.4.585-593
Suresh Sagadevan, Jayasingh Anita Lett, Is Fatimah
Zirconia (also known as zirconium dioxide, ZrO2) is a white crystalline naturally occurring mineral that offers excellent optical, dielectric, and mechanical properties. Considering these properties and referring to previous studies on the optimization of ZrO2 NPs synthesis, in the present study, we studied the crystalline, optical, and fluorescence properties of ZrO2 nanoparticles (NPs) formed by the hydrothermal synthesis route. The physicochemical features of the nanoparticles were examined in the photocatalytic oxidation of rhodamine B. From the powder XRD analysis, the ZrO2 NPs were found to be highly crystalline, while the fluorescence (FL) spectra indicated an emission band at 473 nm, which could be linked to a blue shift. Also, the FTIR and Raman spectroscopies confirmed the functionality and bonding, and in addition, the XPS analysis provided the elemental peaks of Zr 3d and O 1s, where all these analyses evidenced the successful formation of ZrO2. Examination of the photocatalytic activity of ZrO2 NPs revealed the capability of the material for rhodamine B photocatalytic degradation effectively, with a degradation efficiency of 86% after 2 h of treatment. Moreover, the nanoparticles exhibited stability and reusability over five cycles. Overall, from the analysis, ZrO2 NPs can be easily formed via the hydrothermal route with tailored optical and fluorescence properties to find applications in the electronics industry for the manufacturing of light emitting devices.
{"title":"One-pot Hydrothermal Synthesis and Characterization of Zirconium Oxide Nanoparticles","authors":"Suresh Sagadevan, Jayasingh Anita Lett, Is Fatimah","doi":"10.26554/sti.2023.8.4.585-593","DOIUrl":"https://doi.org/10.26554/sti.2023.8.4.585-593","url":null,"abstract":"Zirconia (also known as zirconium dioxide, ZrO2) is a white crystalline naturally occurring mineral that offers excellent optical, dielectric, and mechanical properties. Considering these properties and referring to previous studies on the optimization of ZrO2 NPs synthesis, in the present study, we studied the crystalline, optical, and fluorescence properties of ZrO2 nanoparticles (NPs) formed by the hydrothermal synthesis route. The physicochemical features of the nanoparticles were examined in the photocatalytic oxidation of rhodamine B. From the powder XRD analysis, the ZrO2 NPs were found to be highly crystalline, while the fluorescence (FL) spectra indicated an emission band at 473 nm, which could be linked to a blue shift. Also, the FTIR and Raman spectroscopies confirmed the functionality and bonding, and in addition, the XPS analysis provided the elemental peaks of Zr 3d and O 1s, where all these analyses evidenced the successful formation of ZrO2. Examination of the photocatalytic activity of ZrO2 NPs revealed the capability of the material for rhodamine B photocatalytic degradation effectively, with a degradation efficiency of 86% after 2 h of treatment. Moreover, the nanoparticles exhibited stability and reusability over five cycles. Overall, from the analysis, ZrO2 NPs can be easily formed via the hydrothermal route with tailored optical and fluorescence properties to find applications in the electronics industry for the manufacturing of light emitting devices.","PeriodicalId":21644,"journal":{"name":"Science and Technology Indonesia","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135406593","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}
The electrochemical conversion process of CO2 into methanol using Membrane Electrode Assembly (MEA) has been done. The MEA consists of a Pt/C catalyst in the cathode and a Cu2O ZnO/C catalyst in the anode. The electrodes were made using the spraying method and then characterized using Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS) methods to determine the ECSA (Electrochemical Surface Area) and electrical conductivity values. Besides that, also X-Ray Diffraction (XRD) and Scanning Electrode Microscopy – Energy Dispersive X-Ray (SEM-EDX) analysis was to determine the crystal and morphological structure. The voltammogram from CV analysis indicated that the ECSA value on the Pt/C electrode was 7.2 m2/g and the Cu2O-ZnO/C electrodes as 0.69 m2/g. The electrode’s electrical conductivity value with Pt/C catalyst was 1.15 x 10−3 S/cm, and the electrode with Cu2O-ZnO/C catalyst was 0.80 x 10−3 S/cm. The results of the XRD analysis confirmed the presence of Cu2O and ZnO on the Cu2O-ZnO/C electrode and Pt on the Pt/C electrode. Meanwhile, the results of the SEM-EDX analysis showed that the Pt/C catalyst was spread more evenly with a larger percentage than Cu2O and ZnO. The result of the conversion of CO2 to methanol was measured using a methanol analyzer with variations in KHCO3 electrolyte concentration, variation of temperature operation, and variation of time operation. The best methanol concentrations after distillation process were 79.06 w/v %, with 1 M KHCO3, at room temperature and 2 hours operation.
{"title":"The Electrochemical Conversion of CO2 into Methanol with KHCO3 Electrolyte Using Membrane Electrode Assembly (MEA)","authors":"Dedi Rohendi, Nyimas Febrika Sya’baniah, Edy Herianto Majlan, Nirwan Syarif, Addy Rachmat, Dwi Hawa Yulianti, Icha Amelia, Dimas Ardiyanta, Isya Mahendra, Rr. Whiny Hardiyati Erliana","doi":"10.26554/sti.2023.8.4.632-639","DOIUrl":"https://doi.org/10.26554/sti.2023.8.4.632-639","url":null,"abstract":"The electrochemical conversion process of CO2 into methanol using Membrane Electrode Assembly (MEA) has been done. The MEA consists of a Pt/C catalyst in the cathode and a Cu2O ZnO/C catalyst in the anode. The electrodes were made using the spraying method and then characterized using Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS) methods to determine the ECSA (Electrochemical Surface Area) and electrical conductivity values. Besides that, also X-Ray Diffraction (XRD) and Scanning Electrode Microscopy – Energy Dispersive X-Ray (SEM-EDX) analysis was to determine the crystal and morphological structure. The voltammogram from CV analysis indicated that the ECSA value on the Pt/C electrode was 7.2 m2/g and the Cu2O-ZnO/C electrodes as 0.69 m2/g. The electrode’s electrical conductivity value with Pt/C catalyst was 1.15 x 10−3 S/cm, and the electrode with Cu2O-ZnO/C catalyst was 0.80 x 10−3 S/cm. The results of the XRD analysis confirmed the presence of Cu2O and ZnO on the Cu2O-ZnO/C electrode and Pt on the Pt/C electrode. Meanwhile, the results of the SEM-EDX analysis showed that the Pt/C catalyst was spread more evenly with a larger percentage than Cu2O and ZnO. The result of the conversion of CO2 to methanol was measured using a methanol analyzer with variations in KHCO3 electrolyte concentration, variation of temperature operation, and variation of time operation. The best methanol concentrations after distillation process were 79.06 w/v %, with 1 M KHCO3, at room temperature and 2 hours operation.","PeriodicalId":21644,"journal":{"name":"Science and Technology Indonesia","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135406601","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}
Pub Date : 2023-10-01DOI: 10.26554/sti.2023.8.4.710-715
Hayim Ch. Magid, Bushra Khamas Abbas, Dunia F. T. AL-Ani
The creation and characterization of laser-induced plasma (LIP), a significant phenomenon in several applications, are influenced by the sample’s physical qualities as well as the laser’s parameters. In this research, we created Cu plasma in the atmosphere using an Nd: YAG laser operating at a wavelength of 532 nm with a laser irradiance energy range (400-800) mJ. The effect of the laser’s irradiance energy on the plasma characteristics was investigated using optical emission spectroscopy (OES). Using the two ratio and Stark broadening methods, we successfully measured the two most important plasma properties (electron temperature and electron density). The electron’s plasma temperature value ranged from 2.3 to 3 eV. The value of electron plasma density is in the range from 6.75×1017 to 15×1017 cm−3. Also, we found that other plasma parameters like plasma frequency (fp), particles in the Debye sphere (ND), and Debye length (?D) are affected by laser energy. Where plasma frequency ranged from 7.378 to 10.998×1012 Hz, the Debye sphere ranged from 7.294 to 7.022×103, and the range of Debye length from 1.372 to 1.038×10−5 cm.
{"title":"Spectroscopic Diagnostics of Spectral Lines Emission from Cu Plasma within the Visible Spectrum Range","authors":"Hayim Ch. Magid, Bushra Khamas Abbas, Dunia F. T. AL-Ani","doi":"10.26554/sti.2023.8.4.710-715","DOIUrl":"https://doi.org/10.26554/sti.2023.8.4.710-715","url":null,"abstract":"The creation and characterization of laser-induced plasma (LIP), a significant phenomenon in several applications, are influenced by the sample’s physical qualities as well as the laser’s parameters. In this research, we created Cu plasma in the atmosphere using an Nd: YAG laser operating at a wavelength of 532 nm with a laser irradiance energy range (400-800) mJ. The effect of the laser’s irradiance energy on the plasma characteristics was investigated using optical emission spectroscopy (OES). Using the two ratio and Stark broadening methods, we successfully measured the two most important plasma properties (electron temperature and electron density). The electron’s plasma temperature value ranged from 2.3 to 3 eV. The value of electron plasma density is in the range from 6.75×1017 to 15×1017 cm−3. Also, we found that other plasma parameters like plasma frequency (fp), particles in the Debye sphere (ND), and Debye length (?D) are affected by laser energy. Where plasma frequency ranged from 7.378 to 10.998×1012 Hz, the Debye sphere ranged from 7.294 to 7.022×103, and the range of Debye length from 1.372 to 1.038×10−5 cm.","PeriodicalId":21644,"journal":{"name":"Science and Technology Indonesia","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135406895","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}
Pub Date : 2023-10-01DOI: 10.26554/sti.2023.8.4.594-598
Endah Puspitasari, Masno Ginting, Ramlan Ramlan
The synthesis and characterization of Fe2O3 from Iron Sand of the coastal sea of Cidaun Beach - South Cianjur using the coprecipitation method has been carried out. The purpose of this research was to identify the crystal structure, magnetic mineral content, and magnetic properties of iron sands. The characterizations used in this research are X-Ray Diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX) and Vibrating Sample Magnetometer (VSM). Based on the XRD results, it shows that the iron sand sample produces multi-phases, namely hematite (????-Fe2O3), maghemite (????-Fe2O3) and ilmenite (FeTiO3). SEM-EDX results indicate that the iron sand samples have an average particle size of 12.396 ????m. VSM results indicate that the iron sand sample is soft magnetic (ferrimagnetic) with saturation, remanence and coercivity values of 47 emu/g, 1.53 emu/g and 102.97 Oe, respectively.
{"title":"Preparation and Characterization of Fe2O3 from Iron Sand of the Coastal Sea of Cidaun Beach-South Cianjur (Indonesia) using the Co-precipitation Method","authors":"Endah Puspitasari, Masno Ginting, Ramlan Ramlan","doi":"10.26554/sti.2023.8.4.594-598","DOIUrl":"https://doi.org/10.26554/sti.2023.8.4.594-598","url":null,"abstract":"The synthesis and characterization of Fe2O3 from Iron Sand of the coastal sea of Cidaun Beach - South Cianjur using the coprecipitation method has been carried out. The purpose of this research was to identify the crystal structure, magnetic mineral content, and magnetic properties of iron sands. The characterizations used in this research are X-Ray Diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX) and Vibrating Sample Magnetometer (VSM). Based on the XRD results, it shows that the iron sand sample produces multi-phases, namely hematite (????-Fe2O3), maghemite (????-Fe2O3) and ilmenite (FeTiO3). SEM-EDX results indicate that the iron sand samples have an average particle size of 12.396 ????m. VSM results indicate that the iron sand sample is soft magnetic (ferrimagnetic) with saturation, remanence and coercivity values of 47 emu/g, 1.53 emu/g and 102.97 Oe, respectively.","PeriodicalId":21644,"journal":{"name":"Science and Technology Indonesia","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135408337","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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