CHEESA最新文献 - Book学术

Utilization of Activated Carbon/Magnesium(II) Composites in Decreasing Organic Materials 活性炭/镁(II)复合材料在减少有机材料中的应用

CHEESA Pub Date : 2023-08-22 DOI: 10.25273/cheesa.v6i1.15662.63-75

Dheasi Rani Ullica, Titin Anita Zaharah, Imelda Hotmarisi Silalahi

{"title":"Utilization of Activated Carbon/Magnesium(II) Composites in Decreasing Organic Materials","authors":"Dheasi Rani Ullica, Titin Anita Zaharah, Imelda Hotmarisi Silalahi","doi":"10.25273/cheesa.v6i1.15662.63-75","DOIUrl":"https://doi.org/10.25273/cheesa.v6i1.15662.63-75","url":null,"abstract":"<div><table cellspacing=\"0\" cellpadding=\"0\" align=\"center\"><tbody><tr><td align=\"left\" valign=\"top\">This study aimed to determine the characteristics, adsorption capacity, and isotherm of the adsorbent AC/Mg(II) composite in decreasing organic matter in peat water. Activated carbon was produced from empty fruit bunches of oil palm containing high levels of lignocellulose. Carbon was synthesized through the carbonization process and then activated with CH3COONa. The activated sample was composited with magnesium nitrate hexahydrate through an in-situ method under alkaline conditions using NaOH. The adsorbent AC/Mg(II) composite that had been prepared was characterized using FTIR, showing the presence of Mg-O bonds at the absorption wave number of 403.12 cm-1. The results showed that the moisture content of the adsorbent was lower compared to activated carbon, namely 1.30%. Furthermore, the best mass was 2 g AC/Mg(II) with an adsorption of 2.26 mg/g and an organic matter adsorption percentage of 14.41%. Furthermore, the optimum contact time was 15 minutes with an adsorption of 2.42 mg/g and a percentage of 17.15%. The mechanism occurring in the AC/Mg(II) composite with peat water organic matter followed the Langmuir isotherm equation, which formed a monolayer. The equation gave R2, adsorption capacity (Qo), and adsorption constant (k) values of 0.9994, 0.2340 mg/g, and 0.0047, respectively.</td></tr></tbody></table></div>","PeriodicalId":33035,"journal":{"name":"CHEESA","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135716241","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}

引用次数: 0

Performance Analysis of Ammonia Converter in Ammonia Unit Factory 氨装置厂氨转化器性能分析

CHEESA Pub Date : 2023-08-21 DOI: 10.25273/cheesa.v6i1.14157.56-62

Prahady Susmanto, Dino Dewantara, Teguh Widodo, Susi Susanti

{"title":"Performance Analysis of Ammonia Converter in Ammonia Unit Factory","authors":"Prahady Susmanto, Dino Dewantara, Teguh Widodo, Susi Susanti","doi":"10.25273/cheesa.v6i1.14157.56-62","DOIUrl":"https://doi.org/10.25273/cheesa.v6i1.14157.56-62","url":null,"abstract":"An ammonia converter is a catalyzed reactor that facilitates the synthesis of NH3 (ammonia) from hydrogen (H2) and nitrogen (N2). Several studies have shown that the performance of this reactor significantly influences the operational efficiency and productivity of ammonia plants. Therefore, this study aims to evaluate the performance of an ammonia converter by assessing the effect of operating conditions on the reactant conversion and reaction products using design and actual data. The operating conditions examined included temperature, pressure, ratio of reactants, and inert mole utilized during the NH3 synthesis process. The results showed that the highest NH3 yield of 20.28% was achieved in actual data with 351.5oC temperature, 154.32 kg/cm2 pressure, 3.58 raw material ratio, and 3.57% inert mole (sixth dataset). The performance efficiency of an ammonia converter can be assessed using temperature, reactant ratio, and inert moles, while the pressure factor was insignificant due to dataset fluctuations. Based on the evaluation results, the converter experienced a decrease in performance due to a discrepancy in the existing operating conditions between the design and actual data.","PeriodicalId":33035,"journal":{"name":"CHEESA","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135876412","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}

引用次数: 0

Optimization Production and Characterization of Bacterial Cellulose from Cornhusk 玉米壳细菌纤维素的优化生产及特性研究

CHEESA Pub Date : 2023-08-13 DOI: 10.25273/cheesa.v6i1.11781.49-55

Fikka Kartika Widyastuti, Ayu Chandra Kartika Fitri

{"title":"Optimization Production and Characterization of Bacterial Cellulose from Cornhusk","authors":"Fikka Kartika Widyastuti, Ayu Chandra Kartika Fitri","doi":"10.25273/cheesa.v6i1.11781.49-55","DOIUrl":"https://doi.org/10.25273/cheesa.v6i1.11781.49-55","url":null,"abstract":"<div><table cellspacing=\"0\" cellpadding=\"0\" align=\"center\"><tbody><tr><td align=\"left\" valign=\"top\">Cornhusks are agricultural wastes with low economic value that will cause environmental pollution if not appropriately handled. Cornhusk waste can be processed as raw material for bacterial cellulose (nata) since it contains 44% cellulose. This study aims to optimize bacterial cellulose production from cornhusks and determine the effect of cornhusk mass and fermentation duration on the characteristics of the nata produced. The primary process for producing bacterial cellulose from cornhusks was fermentation by Acetobacter xylinum. The nata characterization carried out in this study includes thickness, yield, crude fiber, and moisture content, as well as statistical analysis to determine whether there was significant effect of variations in cornhusk mass and fermentation duration on bacterial cellulose production. Based on the results of optimizing the production of nata from cornhusks, the optimal mass of cornhusks was of 25 grams with fermentation duration of 17 days. Based on the characterization and data analysis results, variation on the cornhusks mass and duration of the fermentation had a significant effect on fiber content, yield, and tensile strength of bacterial cellulose from cornhusks. On the other hand, the variations on cornhusks mass and the duration of fermentation did not significantly affect the moisture content and thickness of bacterial cellulose from cornhusks.</td></tr></tbody></table></div>","PeriodicalId":33035,"journal":{"name":"CHEESA","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135308891","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}

引用次数: 0

Identification of Flavonoid Compounds in Ethanol Extract of Majapahit plant (Crescentia cujete) Leaves and their Potential as Anticancer 大戟植物(Crescentia cujete)叶片乙醇提取物中黄酮类化合物的鉴定及其抗癌潜力

CHEESA Pub Date : 2023-06-25 DOI: 10.25273/cheesa.v6i1.14056.34-48

Rahma Diyan Martha, Fatimah Fatimah, Danar Danar, Hesty Parbuntari

{"title":"Identification of Flavonoid Compounds in Ethanol Extract of Majapahit plant (Crescentia cujete) Leaves and their Potential as Anticancer","authors":"Rahma Diyan Martha, Fatimah Fatimah, Danar Danar, Hesty Parbuntari","doi":"10.25273/cheesa.v6i1.14056.34-48","DOIUrl":"https://doi.org/10.25273/cheesa.v6i1.14056.34-48","url":null,"abstract":"The Majapahit plant is commonly found in Indonesia but is rarely used due to a lack of information about its potential. One of the secondary metabolites commonly found in this plant are flavonoids. Therefore, this study aims to determine the distribution of flavonoid compounds in the Majapahit plant, particularly their potential as anticancer activty. Leaf material from Majapahit plants was extracted using the maceration technique, while the flavonoid compounds in the extract were identified using LCMS (Shimadzu LCMS-8040 LC/MS). The identification results showed that about 97 compounds were detected, including 14 flavonoids. The flavonoid compounds found include Quercetin, Chlorogenic acid, Kaempferol 3-O rhamnoside, Acacetin 7-rutinoside, Fortunellin, Kaempferol 3-[6”-(3-hydroxy-3-methyl glutarl) glucoside], Didymin, Diosmin, Hesperidin, Rutin, Citrusoside C, Citrusoside D, Narirutin 4'-glucoside, and Kaempferol 3-[6”-(3-hydroxy-3-methylglutaryl)glucoside] -7-glucoside. The highest composition of the identified flavonoid compounds was found in Kaempferol 3-O rhamnoside, with a 3.90%","PeriodicalId":33035,"journal":{"name":"CHEESA","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135842800","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}

引用次数: 0

The Effect of H-Factor on Kappa Number and Viscosity in Continuous Digester h因子对连续蒸煮池中卡伯值和粘度的影响

CHEESA Pub Date : 2023-06-14 DOI: 10.25273/cheesa.v6i1.15681.26-33

Rizka Wulandari Putri, Rahmatullah Rahmatullah, Faisal Siagian

引用次数: 0

Optimization of Ulva sp. Decomposition using H2SO4 with Microwave-Assisted Hydrolysis Method as Feedstock of Bioethanol 以H2SO4为原料微波辅助水解Ulva sp分解生物乙醇的优化研究

CHEESA Pub Date : 2023-06-07 DOI: 10.25273/cheesa.v6i1.14682.13-25

Bekti Palupi, Muhammad Rizalluddin, Kiki Septianti, Istiqomah Rahmawati, Boy Arief Fachri, Meta Fitri Rizkiana, Helda Wika Amini

{"title":"Optimization of Ulva sp. Decomposition using H2SO4 with Microwave-Assisted Hydrolysis Method as Feedstock of Bioethanol","authors":"Bekti Palupi, Muhammad Rizalluddin, Kiki Septianti, Istiqomah Rahmawati, Boy Arief Fachri, Meta Fitri Rizkiana, Helda Wika Amini","doi":"10.25273/cheesa.v6i1.14682.13-25","DOIUrl":"https://doi.org/10.25273/cheesa.v6i1.14682.13-25","url":null,"abstract":"Bioethanol is a renewable energy used to reduce dependence on fossil fuels, which have negative impacts on the environment. Furthermore, Ulva sp. contains high levels of carbohydrates, making it potentially suitable as a raw material for bioethanol production. Therefore, this study aims to determine the optimal decomposition process using the microwave-assisted hydrolysis method with an acid solvent (H2SO4), by examining the effects of acid concentration, hydrolysis time, and microwave power. Optimization was carried out using several parameters such as hydrolysis time, microwave power, and the ratio of raw materials to solvents. The ANOVA test results showed that the hydrolysis variable parameter had a significant effect on the reducing sugar content obtained, evidenced by the R2 value of 0.9892. The highest reducing sugar content of 19.71 mg/mL was produced under the operating conditions of 15 min hydrolysis time, 450 W microwave power, and 0.065 g/mL ratio of raw material to solvents.","PeriodicalId":33035,"journal":{"name":"CHEESA","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135493328","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}

引用次数: 0

Extraction of Basil Leaves Essential Oil using Microwave Assisted Hydrodistillation Method: Physical Characterization and Antibacterial Activity 微波辅助蒸馏法提取罗勒叶精油的物性及抑菌活性研究

CHEESA Pub Date : 2023-05-30 DOI: 10.25273/cheesa.v6i1.14639.1-12

Ditta Kharisma Yolanda Putri, Salsabila Ananda Putri, Briantara Agung Nugraha, Boy Arief Fachri, Bekti Palupi

{"title":"Extraction of Basil Leaves Essential Oil using Microwave Assisted Hydrodistillation Method: Physical Characterization and Antibacterial Activity","authors":"Ditta Kharisma Yolanda Putri, Salsabila Ananda Putri, Briantara Agung Nugraha, Boy Arief Fachri, Bekti Palupi","doi":"10.25273/cheesa.v6i1.14639.1-12","DOIUrl":"https://doi.org/10.25273/cheesa.v6i1.14639.1-12","url":null,"abstract":"Basil oil can be obtained from basil leaves by non-extraction methods, namely Microwave Assisted Hydrodistillation (MAHD). Therefore, this research aims to determine the yield percentage, essential oil composition by GC-MS, physical characteristics, and antibacterial activity of basil essential oil. The highest yield of 0.3076% was obtained at the optimum condition, which included a microwave power of 300 W, a mass-to-volume solvent ratio (F/S) of 0.75 g/mL, a raw material size of ± 1.75 cm, and an extraction time of 90 min. The results of the analysis of variance showed that all process parameters used had a significant effect on the yield obtained. Basil oil exhibited a larger inhibition zone against Escherichia coli bacteria (16.38 mm) which tended to be stronger than Staphylococcus aureus (5.95 mm) and was classified as moderate. The main components contained in the basil oil were E-Citral (46.79%) and Z-Citral (38.17%). The physical characteristic test showed that the basil oil was soluble in 96% ethanol after a ratio of 1:9, with 1 ml of basil oil compared to 9 ml of ethanol. The density of basil oil at 0.961 g/mL also complied with the standard value according to the Essential Oil Association (EOA) of Ocimum basilicum Essential Oil. These results showed revealed that the parameter analyzed using oil yields at operating conditions produced the most optimum yield value.","PeriodicalId":33035,"journal":{"name":"CHEESA","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135691761","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}

引用次数: 0

Analysis of Pyrolytic Product Distribution for B3 and Non-B3 Medical Waste Pyrolysis B3和非B3医疗垃圾热解产物分布分析

CHEESA Pub Date : 2022-12-21 DOI: 10.25273/cheesa.v5i2.14134.101-110

Tri Nur Rezeki, A. Ridwan, W. Meka, Yulia Fitri, Rai Mahendra, Munawir Hamzah, Laras Sita Widara, Azzalya Putri Athala

{"title":"Analysis of Pyrolytic Product Distribution for B3 and Non-B3 Medical Waste Pyrolysis","authors":"Tri Nur Rezeki, A. Ridwan, W. Meka, Yulia Fitri, Rai Mahendra, Munawir Hamzah, Laras Sita Widara, Azzalya Putri Athala","doi":"10.25273/cheesa.v5i2.14134.101-110","DOIUrl":"https://doi.org/10.25273/cheesa.v5i2.14134.101-110","url":null,"abstract":"The coronavirus disease (COVID-19) has badly impacted many sectors, particularly medical waste generation in healthcare facilities. The increasing amount of medical waste poses a serious threat to health and environmental sustainability. Traditional waste processing (burning) cannot be used for B3 medical waste and is often mixed with non-B3 medical waste. This is because it potentially generates dangerous chemicals emitted into the atmosphere. Meanwhile, pyrolysis as a superior thermochemical technology is an effective solution for treating both B3 medical waste and non-B3 medical waste. The waste used in this study has good characteristics, as indicated by the low water and high fixed carbon content. The pyrolysis process yields products with economic value, such as solid, liquid, and gas products. Therefore, this study aims to determine the levels of products that can be produced from B3 and non-B3 medical waste. The results showed that rubber bands produce the highest proportion of liquid products at 44%, the highest solid products were obtained from LDPE plastic waste with a proportion of 65%, while the highest gas product was produced by mask waste at 45%. Based on the results, waste with high product yields can be used as an alternative energy source, such as gasoline, LPG, briquettes, and battery-based materials.","PeriodicalId":33035,"journal":{"name":"CHEESA","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72707335","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}

引用次数: 0

Synthesis and Characterization of SCDs/TiO2 Composite SCDs/TiO2复合材料的合成与表征

CHEESA Pub Date : 2022-12-14 DOI: 10.25273/cheesa.v5i2.13915.92-100

A. B. Aritonang, A. Sapar, Heni Puspita Sari, P. Ardiningsih, Adhitiyawarman Adhitiyawarman

{"title":"Synthesis and Characterization of SCDs/TiO2 Composite","authors":"A. B. Aritonang, A. Sapar, Heni Puspita Sari, P. Ardiningsih, Adhitiyawarman Adhitiyawarman","doi":"10.25273/cheesa.v5i2.13915.92-100","DOIUrl":"https://doi.org/10.25273/cheesa.v5i2.13915.92-100","url":null,"abstract":"Synthesis of sulphur-doped carbon nanodots immobilized on the TiO2 surface (SCDs/TiO2) composite was carried out using the sol-gel method with SCDs and titanium tetraisopropoxide (TTIP) as precursors. SCDs were prepared from citric acid monohydrate, urea, and sodium disulphite using the microwave technique. SCDs/TiO2 was then visually observed under UV 365 nm and characterized by UV-Vis diffuse reflectance spectrophotometry (UV-Vis/DRS), Photoluminescence (PL) spectroscopy, Fourier transform infrared (FT-IR), and X-ray diffraction (XRD). The SCDs/TiO2 composite product had a brown solid with a green luminescent under UV light. Furthermore, UV-Vis/DRS for variations in SCDs concentrations of 0.5%; 1.25%, and 2.5% showed Eg values of 2.33 eV, 2.14 eV, and 1.61 eV, respectively. The results showed that SCDs caused the maximum emission peak (λEm) to redshift and also affected the intensity of PL TiO2. There was also a shift in the absorption peak towards the visible light region. Based on the results, the 0.5% SCDs/TiO2 was the optimum concentration with the lowest intensity as an indication of separation of the (e-) and (h+) charge pairs, which greatly enhanced the photocatalytic efficiency.","PeriodicalId":33035,"journal":{"name":"CHEESA","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91225713","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}

引用次数: 0

Quality Evaluation of Bioplastic from Glutinous Rice Starch Reinforced with Bamboo Leaf Powder 竹叶粉增强糯米淀粉生物塑料的质量评价

CHEESA Pub Date : 2022-12-14 DOI: 10.25273/cheesa.v5i2.14235.82-91

U. F. Arifin, N. P. Adetya, W. Pambudi, Wahyu Ratnaningsih

引用次数: 0