Vanillin is a main component in vanilla, which is widely used in the industrial world. Market demand for vanillin extract continues to increase, while the availability of vanilla pods is decreasing. To overcome this problem, research on the synthesis of vanillin continues to be carried out and develops every year. This research aims to examine the conversion level and selectivity of the catalyst as well as microwave radiation efficiency usage in vanillin synthesis. Catalyst CoO/ZnAl2O4 was synthesized from CoO and ZnAl2O4 using the impregnation method, then analyzed using FTIR, XRD, and SEM-EDX. Vanillin synthesis was conducted in two steps, incorporating microwave usage at 120oC, underwent 30 minutes to be completed then followed by oxidation around 10- and 15-minutes involving nitrobenzene also 1%, 4%, and 7% of catalysts CoO/ZnAl2O4. The result showed that during 10 and 15 minutes, the selectivity value and various yield percentages for each time variation and catalyst loading of vanillin had been successfully 100% converted. The best result was obtained using CoO/ZnAl2O4 with 4% catalyst loading for 15 minutes. The selectivity value and yield percentages were 67.78% and 7.5%. A one-step vanillin synthesis with conventional reflux could also be a comparison. The reactions were done at 130oC for 2 and 3 hours with 4% catalyst loading.
{"title":"Use of CoO/ZnAl2O4 Catalysts and Microwaved Assisted in Vanillin Synthesis","authors":"Damiana Nofita Birhi, E. Iftitah, W. Warsito","doi":"10.15408/jkv.v9i1.29727","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.29727","url":null,"abstract":"Vanillin is a main component in vanilla, which is widely used in the industrial world. Market demand for vanillin extract continues to increase, while the availability of vanilla pods is decreasing. To overcome this problem, research on the synthesis of vanillin continues to be carried out and develops every year. This research aims to examine the conversion level and selectivity of the catalyst as well as microwave radiation efficiency usage in vanillin synthesis. Catalyst CoO/ZnAl2O4 was synthesized from CoO and ZnAl2O4 using the impregnation method, then analyzed using FTIR, XRD, and SEM-EDX. Vanillin synthesis was conducted in two steps, incorporating microwave usage at 120oC, underwent 30 minutes to be completed then followed by oxidation around 10- and 15-minutes involving nitrobenzene also 1%, 4%, and 7% of catalysts CoO/ZnAl2O4. The result showed that during 10 and 15 minutes, the selectivity value and various yield percentages for each time variation and catalyst loading of vanillin had been successfully 100% converted. The best result was obtained using CoO/ZnAl2O4 with 4% catalyst loading for 15 minutes. The selectivity value and yield percentages were 67.78% and 7.5%. A one-step vanillin synthesis with conventional reflux could also be a comparison. The reactions were done at 130oC for 2 and 3 hours with 4% catalyst loading.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42396617","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}
Sedin Renadi, A. Pratita, R. Mardianingrum, R. Ruswanto
Breast cancer is the most frequent malignancy in women worldwide. One of the target receptors for the treatment of breast cancer are estrogen, progesterone, and HER2 receptors. An alternative treatment using natural ingredients has been developed, one of which is alkaloid compounds. This study aims to determine the activity of alkaloid compounds as anti-breast cancer agents through an in-silico method. Virtual screening (AutoDock Vina), molecular docking (AutoDock Tools), molecular dynamics (Desmond), scanning Lipinski's rule of five, as well as pharmacokinetic and toxicity parameters, were performed. The results of virtual screening, molecular docking, and molecular dynamics show that the compounds daurisoline, solasodine, and sambutoxin have stable interactions with the HER2 receptor, with the lowest values of RMSD (Root Mean Square Deviation) and RMSF (Root Mean Square Fluctuation) compared to other compounds. Based on the results of the study conducted, it was shown that daurisoline, solasodine, and sambutoxin were predicted to be used as anti-HER2 candidates for the treatment of breast cancer.
{"title":"The Potency of Alkaloid Derivates as Anti-Breast Cancer Candidates: In Silico Study","authors":"Sedin Renadi, A. Pratita, R. Mardianingrum, R. Ruswanto","doi":"10.15408/jkv.v9i1.31481","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.31481","url":null,"abstract":"Breast cancer is the most frequent malignancy in women worldwide. One of the target receptors for the treatment of breast cancer are estrogen, progesterone, and HER2 receptors. An alternative treatment using natural ingredients has been developed, one of which is alkaloid compounds. This study aims to determine the activity of alkaloid compounds as anti-breast cancer agents through an in-silico method. Virtual screening (AutoDock Vina), molecular docking (AutoDock Tools), molecular dynamics (Desmond), scanning Lipinski's rule of five, as well as pharmacokinetic and toxicity parameters, were performed. The results of virtual screening, molecular docking, and molecular dynamics show that the compounds daurisoline, solasodine, and sambutoxin have stable interactions with the HER2 receptor, with the lowest values of RMSD (Root Mean Square Deviation) and RMSF (Root Mean Square Fluctuation) compared to other compounds. Based on the results of the study conducted, it was shown that daurisoline, solasodine, and sambutoxin were predicted to be used as anti-HER2 candidates for the treatment of breast cancer.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49198153","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}
Salma Nur Zakiyyah, D. Eddy, M. L. Firdaus, T. Subroto, Y. Hartati
This study aims to optimize the epithelial sodium channel (ENaC) electrochemical aptasensor with the Box-Behnken experimental design. ENaC is a protein that plays a role in sodium ion transport in several epithelial tissues and is associated with hypertension. The ENaC protein aptamer is held in place in the electrochemical aptasensor by a modified screen-printed carbon electrode (SPCE) of silica-ceria composite (SiO2-CeO2). The unique structure of a silica matrix with high biocompatibility can form composites through a hydrothermal process. The Box-Behnken (BBD) experimental design is an efficient optimization method of factors that affect the experiment at three levels. The FTIR results of the silica-ceria composites were 549.35 cm-1 (Ce-O), 1095.3 cm-1 (Si-O-Si), and 491.28 cm-1 (Si-O). Meanwhile, SPCE/silica-ceria characterized by differential pulse voltammetry (DPV) showed an increase in peak current [Fe(CN)6]3-/4- from 3.190 μA to 9.073 μA. Three experimental factors, aptamer concentration, streptavidin incubation time, and aptamer incubation time, were optimized with BBD and obtained at 0.5 μg.mL-1, 30 minutes, and 1 hour. The optimum conditions observed resulted in a selective current response for ENaC protein detection. The optimization results can be applied to aptamer-based ENaC protein detection in samples.
{"title":"Box-Behnken Experimental Design for Electrochemical Aptasensor Optimization on Screen Printed Carbon Electrode/Silica-Ceria","authors":"Salma Nur Zakiyyah, D. Eddy, M. L. Firdaus, T. Subroto, Y. Hartati","doi":"10.15408/jkv.v9i1.27493","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.27493","url":null,"abstract":"This study aims to optimize the epithelial sodium channel (ENaC) electrochemical aptasensor with the Box-Behnken experimental design. ENaC is a protein that plays a role in sodium ion transport in several epithelial tissues and is associated with hypertension. The ENaC protein aptamer is held in place in the electrochemical aptasensor by a modified screen-printed carbon electrode (SPCE) of silica-ceria composite (SiO2-CeO2). The unique structure of a silica matrix with high biocompatibility can form composites through a hydrothermal process. The Box-Behnken (BBD) experimental design is an efficient optimization method of factors that affect the experiment at three levels. The FTIR results of the silica-ceria composites were 549.35 cm-1 (Ce-O), 1095.3 cm-1 (Si-O-Si), and 491.28 cm-1 (Si-O). Meanwhile, SPCE/silica-ceria characterized by differential pulse voltammetry (DPV) showed an increase in peak current [Fe(CN)6]3-/4- from 3.190 μA to 9.073 μA. Three experimental factors, aptamer concentration, streptavidin incubation time, and aptamer incubation time, were optimized with BBD and obtained at 0.5 μg.mL-1, 30 minutes, and 1 hour. The optimum conditions observed resulted in a selective current response for ENaC protein detection. The optimization results can be applied to aptamer-based ENaC protein detection in samples.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41855598","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}
Riyan Alifbi Putera Irsal, M. Safithri, D. Andrianto, E. Mardliyati
Hyperpigmentation is a condition of darkening of the skin which is generally caused by an increase in melanin production. Melanin is produced in melanocytes by the enzyme tyrosinase. Piper crocatum contains flavonoid compounds that are known from previous research to inhibit tyrosinase. The goals of this study were to determine the tyrosinase inhibitory activity and total flavonoid content of seven accessions, as well as look at the Pearson’s correlation and clustering PCA (principal component analysis). The method used was water content analysis, extraction yield measurement, total flavonoids analysis, and in vitro tyrosinase inhibition. Based on the results, P. crocatum from Kendari had the best yield and total flavonoid content of 24.07% and 5.10 mg QE g-1, while P. crocatum from Bogor had the lowest water content with a value of 6.21% and the best in tyrosinase inhibition of 13.77. The correlation between total flavonoid content and percent inhibition showed a very weak correlation. The results of clustering formed four clusters of seven accessions based on total flavonoids and percent inhibition. The cluster was divided into Malang (506mDPL) and Jayapura (287mDPL), Banda Aceh (0.80mDPL) and Bandung (670mDPL), Samarinda (8mDPL) and Bogor (190-350m DPL), and Kendari (14mDPL). In conclusion, the correlation between total flavonoid levels and percent inhibition is very weak and regional diversity had a significant effect on total flavonoids and total inhibition.
色素沉着是一种皮肤变黑的情况，通常是由黑色素分泌增加引起的。黑色素是由酪氨酸酶在黑素细胞中产生的。藏红花含有黄酮类化合物，从以前的研究中已知，可以抑制酪氨酸酶。本研究的目的是确定7个材料的酪氨酸酶抑制活性和总黄酮含量，并观察Pearson相关和聚类PCA(主成分分析)。采用水分分析、提取率测定、总黄酮分析、体外酪氨酸酶抑制等方法。综上所述，产自肯达里的藏红花产量最高，总黄酮含量为24.07%，5.10 mg QE -1;而产自茂物的藏红花含水量最低，为6.21%，酪氨酸酶抑制效果最好，为13.77。总黄酮含量与抑制率呈极弱相关。聚类结果根据总黄酮和抑制率组成4个聚类。该集群分为玛琅(506mDPL)和查亚普拉(287mDPL)，班达亚齐(0.80mDPL)和万隆(670mDPL)，萨玛林达(8mDPL)和茂物(190-350m dppl)，以及肯达里(14mDPL)。综上所述，总黄酮水平与总抑制率之间的相关性很弱，区域多样性对总黄酮和总抑制率有显著影响。
{"title":"Flavonoid Concentration and Tyrosinase Inhibition Activity of Ethanol Extract of Piper crocatum (Piper crocatum var. Ruiz & Pav) from Various Regions in Indonesia and Their Correlations","authors":"Riyan Alifbi Putera Irsal, M. Safithri, D. Andrianto, E. Mardliyati","doi":"10.15408/jkv.v9i1.31426","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.31426","url":null,"abstract":"Hyperpigmentation is a condition of darkening of the skin which is generally caused by an increase in melanin production. Melanin is produced in melanocytes by the enzyme tyrosinase. Piper crocatum contains flavonoid compounds that are known from previous research to inhibit tyrosinase. The goals of this study were to determine the tyrosinase inhibitory activity and total flavonoid content of seven accessions, as well as look at the Pearson’s correlation and clustering PCA (principal component analysis). The method used was water content analysis, extraction yield measurement, total flavonoids analysis, and in vitro tyrosinase inhibition. Based on the results, P. crocatum from Kendari had the best yield and total flavonoid content of 24.07% and 5.10 mg QE g-1, while P. crocatum from Bogor had the lowest water content with a value of 6.21% and the best in tyrosinase inhibition of 13.77. The correlation between total flavonoid content and percent inhibition showed a very weak correlation. The results of clustering formed four clusters of seven accessions based on total flavonoids and percent inhibition. The cluster was divided into Malang (506mDPL) and Jayapura (287mDPL), Banda Aceh (0.80mDPL) and Bandung (670mDPL), Samarinda (8mDPL) and Bogor (190-350m DPL), and Kendari (14mDPL). In conclusion, the correlation between total flavonoid levels and percent inhibition is very weak and regional diversity had a significant effect on total flavonoids and total inhibition.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48932458","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}
Petroleum is the primary energy that is generally used throughout the world. Its non-renewable nature and exhaust gas emissions that can damage the environment are a concern for developing environmentally friendly renewable energy. Green diesel is an alternative energy to replace diesel fuel (diesel) from petroleum which has the potential to be developed. The raw material in palm oil has great potential for development due to its relatively high production. Green diesel synthesis can be carried out using the catalytic deoxygenation method. The type of raw material, catalyst, and process conditions influences this method. The catalyst is the most influential factor in catalytic deoxygenation. Transition metal catalysts like nickel are inexpensive and have good catalytic activity like precious metals. Catalytic activity can be increased by modifying the catalyst components and optimizing the process. Modification of the catalyst can increase the surface area, Lewis and Bronsted sites, and crystal size so that the resulting green diesel can be maximized, such as Ni-Co, Ni-Zn, and Ni-Mo bimetallic catalysts.
{"title":"Synthesis of Green Diesel from Palm Oil Using Nickel-based Catalyst: A Review","authors":"I. Aziz, P. Sugita, N. Darmawan, A. A. Dwiatmoko","doi":"10.15408/jkv.v9i1.26488","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.26488","url":null,"abstract":"Petroleum is the primary energy that is generally used throughout the world. Its non-renewable nature and exhaust gas emissions that can damage the environment are a concern for developing environmentally friendly renewable energy. Green diesel is an alternative energy to replace diesel fuel (diesel) from petroleum which has the potential to be developed. The raw material in palm oil has great potential for development due to its relatively high production. Green diesel synthesis can be carried out using the catalytic deoxygenation method. The type of raw material, catalyst, and process conditions influences this method. The catalyst is the most influential factor in catalytic deoxygenation. Transition metal catalysts like nickel are inexpensive and have good catalytic activity like precious metals. Catalytic activity can be increased by modifying the catalyst components and optimizing the process. Modification of the catalyst can increase the surface area, Lewis and Bronsted sites, and crystal size so that the resulting green diesel can be maximized, such as Ni-Co, Ni-Zn, and Ni-Mo bimetallic catalysts.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46808032","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 intricate molecular structure of the dyes in wastewater makes it difficult to biodegrade, which could harm the environment. Currently, semiconductor-based photocatalytic methods are being developed to remove dyes from water. In this study, the α-Fe2O3-bentonite photocatalyst was synthesized by mechanical milling and immobilized in polyacrylonitrile (PAN) membrane by phase inversion. Analysis of the composition and surface morphology of the synthesized samples was carried out by FTIR, XRD, and EDX. The performance of the photocatalytic membrane was studied by investigating the removal of methylene blue (MB). Photocatalytic membrane with 2% α-Fe2O3-bentonite had the best performance in removing MB (10 ppm) that reached 99.84% at pH 11.5 with an irradiation time of 300 minutes under direct sunlight. The reuse cycle of the photocatalytic membrane was also carried out and the results showed that there is no significant change in the photodegradation efficiency after 3 cycles. Photocatalyst immobilization on PAN membranes is proven to overcome the post-recovery problem of photocatalysts and making easier to reuse. The photocatalyst membrane synthesized in this study can be used as an alternative for removing dyes from water.
{"title":"Application of PAN/α-Fe2O3-Bentonite as A Photocatalytic Membrane for The Photodegradation of Methylene Blue","authors":"Dina Wardani Sitompul, T. Kemala, N. Darmawan","doi":"10.15408/jkv.v9i1.28635","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.28635","url":null,"abstract":"The intricate molecular structure of the dyes in wastewater makes it difficult to biodegrade, which could harm the environment. Currently, semiconductor-based photocatalytic methods are being developed to remove dyes from water. In this study, the α-Fe2O3-bentonite photocatalyst was synthesized by mechanical milling and immobilized in polyacrylonitrile (PAN) membrane by phase inversion. Analysis of the composition and surface morphology of the synthesized samples was carried out by FTIR, XRD, and EDX. The performance of the photocatalytic membrane was studied by investigating the removal of methylene blue (MB). Photocatalytic membrane with 2% α-Fe2O3-bentonite had the best performance in removing MB (10 ppm) that reached 99.84% at pH 11.5 with an irradiation time of 300 minutes under direct sunlight. The reuse cycle of the photocatalytic membrane was also carried out and the results showed that there is no significant change in the photodegradation efficiency after 3 cycles. Photocatalyst immobilization on PAN membranes is proven to overcome the post-recovery problem of photocatalysts and making easier to reuse. The photocatalyst membrane synthesized in this study can be used as an alternative for removing dyes from water.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44364947","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}
Yong Richard Sriwijaya, P. J. Ratri, T. R. Mayangsari, Azis Adharis, S. S. Riswati
Increasing oil consumption in Indonesia encourages an improvement of production using chemical flooding of Enhanced Oil Recovery (EOR) technology. Chemical flooding is an injection method of materials based on polymer and nanoparticles such as α-Fe2O3-xanthan gum nanocomposite into the reservoir. In this study, α-Fe2O3 nanoparticles were synthesised and then blended to xanthan gum by sonochemical method through an ex-situ process. The α-Fe2O3-xanthan gum nanocomposite X-ray diffraction (XRD) shows that there are no additional peaks. Only the α-Fe2O3 and the xanthan gum peaks are detected with the crystallite size of around 16-20 nm. The particle size of α-Fe2O3-xanthan gum (1:1) nanocomposite as measured by Particle Size Analyzer (PSA) was 228.43 nm with the type of polydisperse. The functional group of the nanocomposite is a combination of the α-Fe2O3 and xanthan gum functional groups which shows there are no other compounds detected in IR spectra. The EOR test showed that xanthan gum had a significant effect on increasing the viscosity of the α-Fe2O3-xanthan gum nanofluid to 1.964 cP at a 1:2 composition. Based on these results, α-Fe2O3-xanthan gum nanofluid is the potential material used in the chemical flooding process in the reservoir.
{"title":"Synthesis of Iron Oxide (Fe2O3)-Xanthan Gum Nanoparticle Composites Its Potential as a Chemical Flooding Media in Enhanced Oil Recovery (EOR)","authors":"Yong Richard Sriwijaya, P. J. Ratri, T. R. Mayangsari, Azis Adharis, S. S. Riswati","doi":"10.15408/jkv.v9i1.29468","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.29468","url":null,"abstract":"Increasing oil consumption in Indonesia encourages an improvement of production using chemical flooding of Enhanced Oil Recovery (EOR) technology. Chemical flooding is an injection method of materials based on polymer and nanoparticles such as α-Fe2O3-xanthan gum nanocomposite into the reservoir. In this study, α-Fe2O3 nanoparticles were synthesised and then blended to xanthan gum by sonochemical method through an ex-situ process. The α-Fe2O3-xanthan gum nanocomposite X-ray diffraction (XRD) shows that there are no additional peaks. Only the α-Fe2O3 and the xanthan gum peaks are detected with the crystallite size of around 16-20 nm. The particle size of α-Fe2O3-xanthan gum (1:1) nanocomposite as measured by Particle Size Analyzer (PSA) was 228.43 nm with the type of polydisperse. The functional group of the nanocomposite is a combination of the α-Fe2O3 and xanthan gum functional groups which shows there are no other compounds detected in IR spectra. The EOR test showed that xanthan gum had a significant effect on increasing the viscosity of the α-Fe2O3-xanthan gum nanofluid to 1.964 cP at a 1:2 composition. Based on these results, α-Fe2O3-xanthan gum nanofluid is the potential material used in the chemical flooding process in the reservoir.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41247381","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}
Eutrophication is a phenomenon of decreasing air quality caused by the very high amount of phosphate ions in the aquatic system. Thus, an effective and efficient adsorbent is needed for phosphate absorption in aquatic systems. In this study, zeolit from fly ash waste was modified with zirconium (Zr) as an adsorbent for phosphate absorption in aquatic systems. Fly ash was pretreated with acid and then synthesised using the hydrothermal method. And then, the results of the fly ash zeolit synthesis were continued using zirconium. The adsorption capacity was tested through several parameters, including the adsorbent concentration test, variations in pH,and contact time. Zirconium-modified zeolite (ZrMZ) adsorbent was the most effective adsorbent for phosphate adsorption, with an adsorption capacity of 3.015 mg-P/g at a 3 g/L adsorbent dosage and pH 7. The adsorption kinetics for the ZrMZ adsorbent followed pseudo-second-order kinetics. The best result of ZrMZ adsorbent to absorb phosphate in lake water was an adsorption capacity value of 0.186 mg-P/g and an adsorption efficiency of 81.137%.
{"title":"Zeolite from Zirconium-Modified Fly Ash Waste for Absorption of Phosphate Compounds in Waters","authors":"Mu'izzah Irsyadi Putri, A. Saefumillah, R. Bakri","doi":"10.15408/jkv.v9i1.26951","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.26951","url":null,"abstract":"Eutrophication is a phenomenon of decreasing air quality caused by the very high amount of phosphate ions in the aquatic system. Thus, an effective and efficient adsorbent is needed for phosphate absorption in aquatic systems. In this study, zeolit from fly ash waste was modified with zirconium (Zr) as an adsorbent for phosphate absorption in aquatic systems. Fly ash was pretreated with acid and then synthesised using the hydrothermal method. And then, the results of the fly ash zeolit synthesis were continued using zirconium. The adsorption capacity was tested through several parameters, including the adsorbent concentration test, variations in pH,and contact time. Zirconium-modified zeolite (ZrMZ) adsorbent was the most effective adsorbent for phosphate adsorption, with an adsorption capacity of 3.015 mg-P/g at a 3 g/L adsorbent dosage and pH 7. The adsorption kinetics for the ZrMZ adsorbent followed pseudo-second-order kinetics. The best result of ZrMZ adsorbent to absorb phosphate in lake water was an adsorption capacity value of 0.186 mg-P/g and an adsorption efficiency of 81.137%.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42176559","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}
Indonesia, as an agricultural country, has a variety of abundant plants. Cellulose is a component in plants that can be modified to increase its economic value. Resizing cellulose to nanocellulose and modification of nanocellulose to nanocellulose acetate can increase its potential as a surfactant. Resizing cellulose can be done using the strong acid hydrolysis method. An acetic anhydride reagent was utilized to convert the surface hydroxyl functional group into acetyl. The successful production and modification of nanocellulose were confirmed using fourier transform infrared and particle size analysis characterization. The infrared absorption spectrum of cellulose and nanocellulose showed no difference in peaks. Particle size distribution showed that nanocellulose I (CNC I) and nanocellulose II (CNC II) has sizes of 142 nm and 319 nm, respectively. The property of nanocellulose molecules in an oil-water system was simulated using molecular dynamics with GROMACS 2020.6 software. Appropriate trends can be seen in the interfacial tension of water-vegetable oil systems. The value of interfacial tension decreases with the addition of nanocellulose acetate compared to the addition of nanocellulose. With the agreement between the experimental and computational results, nanocellulose acetate can act as a surfactant.
{"title":"The Potential of Nanocellulose Acetate as Surfactant for Water-Vegetable Oil Systems","authors":"Ikhsan Ibrahim, M. Ledyastuti","doi":"10.15408/jkv.v9i1.29467","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.29467","url":null,"abstract":"Indonesia, as an agricultural country, has a variety of abundant plants. Cellulose is a component in plants that can be modified to increase its economic value. Resizing cellulose to nanocellulose and modification of nanocellulose to nanocellulose acetate can increase its potential as a surfactant. Resizing cellulose can be done using the strong acid hydrolysis method. An acetic anhydride reagent was utilized to convert the surface hydroxyl functional group into acetyl. The successful production and modification of nanocellulose were confirmed using fourier transform infrared and particle size analysis characterization. The infrared absorption spectrum of cellulose and nanocellulose showed no difference in peaks. Particle size distribution showed that nanocellulose I (CNC I) and nanocellulose II (CNC II) has sizes of 142 nm and 319 nm, respectively. The property of nanocellulose molecules in an oil-water system was simulated using molecular dynamics with GROMACS 2020.6 software. Appropriate trends can be seen in the interfacial tension of water-vegetable oil systems. The value of interfacial tension decreases with the addition of nanocellulose acetate compared to the addition of nanocellulose. With the agreement between the experimental and computational results, nanocellulose acetate can act as a surfactant.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48572036","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}
Hydroxyapatite (HAp) is a major component of bones and teeth. HAp is widely used to repair, fill, extend, and reconstruct damaged bone tissue. HAp is used for bone and dental implants, so it is necessary to synthesize HAp. HAp synthesis can utilize green mussel shell waste as a calcium precursor. This research synthesized HAp from a green mussel shell using the sol-gel method. The controlled synthesis parameter was pH, and the variable being compared was the heating temperature at 900 and 1100 °C. The HAp products were characterized by an X-ray diffractometer (XRD), Fourier-transform infrared spectrophotometer, and scanning electron microscope. The results showed that HAp was formed at alkaline pH, namely at pH 11. The XRD pattern showed that Hap was formed along with type A apatite carbonate, octacalcium phosphate, α- and β-tricalcium phosphate. The crystallinity was increased by raising the temperature and prolonging the heating time. The quality of HAp will improve with increasing crystallinity, and increasing the temperature will also raise the amount of HAp formed.
{"title":"Synthesis and Characterization of Hydroxyapatite from Green Mussel Shell with Sol-Gel Method","authors":"Charlena Charlena, A. Maddu, T. Hidayat","doi":"10.15408/jkv.v8i2.27494","DOIUrl":"https://doi.org/10.15408/jkv.v8i2.27494","url":null,"abstract":"Hydroxyapatite (HAp) is a major component of bones and teeth. HAp is widely used to repair, fill, extend, and reconstruct damaged bone tissue. HAp is used for bone and dental implants, so it is necessary to synthesize HAp. HAp synthesis can utilize green mussel shell waste as a calcium precursor. This research synthesized HAp from a green mussel shell using the sol-gel method. The controlled synthesis parameter was pH, and the variable being compared was the heating temperature at 900 and 1100 °C. The HAp products were characterized by an X-ray diffractometer (XRD), Fourier-transform infrared spectrophotometer, and scanning electron microscope. The results showed that HAp was formed at alkaline pH, namely at pH 11. The XRD pattern showed that Hap was formed along with type A apatite carbonate, octacalcium phosphate, α- and β-tricalcium phosphate. The crystallinity was increased by raising the temperature and prolonging the heating time. The quality of HAp will improve with increasing crystallinity, and increasing the temperature will also raise the amount of HAp formed.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42383256","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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