Perwitasari Perwitasari, Heni Anggorowati, Susanti Rina Nugraheni, I. Lestari
Carotenoids are pigments found in various types of fruits and vegetables that provide yellow, orange, and red colors. This study aimed to extract yellow pumpkin skin using edible oil solvents. The extraction process was carried out using ultrasound-assisted extraction (UAE) method with virgin coconut oil (VCO) and palm kernel oil (PKO). Yellow pumpkin peel powder with sizes of 40 mesh and 100 mesh were extracted with variations in extraction time (30 minutes, 60 minutes, and 90 minutes) and variations in solid-to-solvent ratio (1:10, 1:20, 1:30, 1:40, and 1:50). UV-Vis spectrophotometer analysis was used to determine the concentration of the extraction results. According to the research results, the best carotenoid concentration of 2513.44 ppm was obtained using PKO solvent with a powder size of 100 mesh, extraction time of 30 minutes, and powder-to-solvent ratio of 1:10.
{"title":"Edible Oil sebagai Pelarut Ekstraksi Karotenoid dari Kulit Labu Kuning (Cucurbita moschata)","authors":"Perwitasari Perwitasari, Heni Anggorowati, Susanti Rina Nugraheni, I. Lestari","doi":"10.31315/e.v20i2.10003","DOIUrl":"https://doi.org/10.31315/e.v20i2.10003","url":null,"abstract":"Carotenoids are pigments found in various types of fruits and vegetables that provide yellow, orange, and red colors. This study aimed to extract yellow pumpkin skin using edible oil solvents. The extraction process was carried out using ultrasound-assisted extraction (UAE) method with virgin coconut oil (VCO) and palm kernel oil (PKO). Yellow pumpkin peel powder with sizes of 40 mesh and 100 mesh were extracted with variations in extraction time (30 minutes, 60 minutes, and 90 minutes) and variations in solid-to-solvent ratio (1:10, 1:20, 1:30, 1:40, and 1:50). UV-Vis spectrophotometer analysis was used to determine the concentration of the extraction results. According to the research results, the best carotenoid concentration of 2513.44 ppm was obtained using PKO solvent with a powder size of 100 mesh, extraction time of 30 minutes, and powder-to-solvent ratio of 1:10.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47160558","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}
Soewignjo Agus Nugroho, Bambang Wisaksono, Heru Suharyadi
Cement is proven increasing the strength of soft clays. Monmorillonite has a high shrinkage. Another hand, Kaolin has a small shrinkage. Waste material usage for stabilization agent was widely carried out this decade. BAFA (bottom ash fly ash) and POFA (palm oil fuel ash) are rich in Silica and Alumina, so they used to substitute of cement. The study examined the effect of Monmorillonite, Kaolin, BAFA and POFA on stabilization of clay with cement. Bentonite from 4% to 16% (is equated to BAFA and POFA, in ratio of 2:1) and Kaolin by 2.5%, used to reduce clay shrinkage, mixed with cement by 3% and 5%. Soil behavior will be reviewed from laboratory tests on curing-noncuring and soaked-unsoaked conditions. The results show changes in Atterberg Limits and Hydraulic Conductivity (permeability, k). Cement as well as BAFA and POFA reduce Plastic Limit greater than Liquid Limit. So, Plasticity Index decreased. It’s can be seen that cement and ash waste decreasing the permeability value. More Ash and less cement, make more impermeable soil. Addition of 3% and 5% cement increased the UCS values from 14.32 kPa to 81.20 kPa and 589.68 kPa and CBR value from 0.78% to 4.20% and 589.68 42.12% respectively
{"title":"Efek Penambahan Bahan Aditif Non-Alami terhadap Perilaku Lempung Plastisitas Tinggi yang Distabilisasi dengan Semen","authors":"Soewignjo Agus Nugroho, Bambang Wisaksono, Heru Suharyadi","doi":"10.31315/e.v20i2.9517","DOIUrl":"https://doi.org/10.31315/e.v20i2.9517","url":null,"abstract":"Cement is proven increasing the strength of soft clays. Monmorillonite has a high shrinkage. Another hand, Kaolin has a small shrinkage. Waste material usage for stabilization agent was widely carried out this decade. BAFA (bottom ash fly ash) and POFA (palm oil fuel ash) are rich in Silica and Alumina, so they used to substitute of cement. The study examined the effect of Monmorillonite, Kaolin, BAFA and POFA on stabilization of clay with cement. Bentonite from 4% to 16% (is equated to BAFA and POFA, in ratio of 2:1) and Kaolin by 2.5%, used to reduce clay shrinkage, mixed with cement by 3% and 5%. Soil behavior will be reviewed from laboratory tests on curing-noncuring and soaked-unsoaked conditions. The results show changes in Atterberg Limits and Hydraulic Conductivity (permeability, k). Cement as well as BAFA and POFA reduce Plastic Limit greater than Liquid Limit. So, Plasticity Index decreased. It’s can be seen that cement and ash waste decreasing the permeability value. More Ash and less cement, make more impermeable soil. Addition of 3% and 5% cement increased the UCS values from 14.32 kPa to 81.20 kPa and 589.68 kPa and CBR value from 0.78% to 4.20% and 589.68 42.12% respectively","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48972276","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}
Ilham Mufandi, Ratchaphon Suntivarakorn, Wasakorn Treedet, Piyapong Singbua
Sugarcane leaves are one of the agro-industrial wastes derived from sugarcane plants. In this research, sugarcane leaves are used as raw material for pyrolysis which produces three main products: liquid, solid, and gas. The focus of this research is to identify the effect of temperature on pyrolysis, identify mass changes, identify decomposition, and identify the chemical composition of bio-oil. The pyrolysis was carried out using a Circulating Fluidized Bed (CFBr) reactor with pyrolysis temperature variations from 440oC to 520oC. Analysis of pyrolysis characteristics of sugarcane leaves are used thermogravimetric analysis (TGA), DTA, and GC-MS analysis. The results showed that the operating temperature had a significant effect on the pyrolysis process. The highest bio-oil found at 480oC, namely 34.33%. TGA results show that the decomposition process of sugarcane leaves is divided into 3 stages: 1) dehydration of water content occurs at <200oC, 2) active pyrolysis occurs from 200oC to 380oC, and 3) passive pyrolysis occurs at temperature from 380oC to 500oC. DTA results show that the thermal changes are affected by the pyrolysis heating rate. The highest bio-oil compounds are β-D-Glucopyranose 1,6-anhydro, acetic acid, and 2-Propanone 1-hydroxy-. This research proves that temperature has an important role in the pyrolysis process.
甘蔗叶片是由甘蔗产生的农工废弃物之一。本研究以甘蔗叶片为原料进行热解，热解产生液体、固体和气体三种主要产物。本研究的重点是确定温度对热解的影响，确定质量变化，确定分解，确定生物油的化学成分。采用循环流化床(CFBr)反应器进行热解，热解温度为440 ~ 520℃。对甘蔗叶片的热解特性进行了热重分析(TGA)、差热分析(DTA)和气相色谱-质谱分析(GC-MS)。结果表明，操作温度对热解过程有显著影响。在480℃时生物油含量最高，占34.33%。TGA结果表明，甘蔗叶片的分解过程分为3个阶段:1)含水量在<200℃发生脱水，2)在200℃~ 380℃发生主动热解，3)在380℃~ 500℃发生被动热解。差热分析结果表明，热变化受热解升温速率的影响。最高的生物油化合物是β- d -葡萄糖醛酸1,6-无水，乙酸和2-丙烷- 1-羟基。本研究证明温度在热解过程中起着重要的作用。
{"title":"Analisis Termogravimetri dan Dekomposisi Termal pada Produksi Bio-Oil dari Daun Tebu Menggunakan Proses Pirolisis Cepat","authors":"Ilham Mufandi, Ratchaphon Suntivarakorn, Wasakorn Treedet, Piyapong Singbua","doi":"10.31315/e.v20i2.9849","DOIUrl":"https://doi.org/10.31315/e.v20i2.9849","url":null,"abstract":"Sugarcane leaves are one of the agro-industrial wastes derived from sugarcane plants. In this research, sugarcane leaves are used as raw material for pyrolysis which produces three main products: liquid, solid, and gas. The focus of this research is to identify the effect of temperature on pyrolysis, identify mass changes, identify decomposition, and identify the chemical composition of bio-oil. The pyrolysis was carried out using a Circulating Fluidized Bed (CFBr) reactor with pyrolysis temperature variations from 440oC to 520oC. Analysis of pyrolysis characteristics of sugarcane leaves are used thermogravimetric analysis (TGA), DTA, and GC-MS analysis. The results showed that the operating temperature had a significant effect on the pyrolysis process. The highest bio-oil found at 480oC, namely 34.33%. TGA results show that the decomposition process of sugarcane leaves is divided into 3 stages: 1) dehydration of water content occurs at <200oC, 2) active pyrolysis occurs from 200oC to 380oC, and 3) passive pyrolysis occurs at temperature from 380oC to 500oC. DTA results show that the thermal changes are affected by the pyrolysis heating rate. The highest bio-oil compounds are β-D-Glucopyranose 1,6-anhydro, acetic acid, and 2-Propanone 1-hydroxy-. This research proves that temperature has an important role in the pyrolysis process.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46155897","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}
Agik Dwika Putra, Ilham Satria Raditya Putra, Rochim Bakti Cahyono
As one of the power plants that uses coal as an energy source, PT Cirebon Electric Power (PT CEP) is committed to addressing waste problems with the 3R principle. Sludge ash ponds which is waste of the process production has the potential for alternative fuel. This study aims to evaluate the utilization of sludge ash ponds with the main target parameter in the form of calorific value. Based on proximate analysis, sludge pond ash only had a low heating value, around 210 kcal/kg, thus unbeneficial to be used as fuel directly. In order to make efficient utilization, a pyrolysis process was carried out to increase the existing heating value and was obtained at 700 – 870 kcal/kg. Generally, the standard of alternative fuel had minimum heating value of 4500 kcal/kg, therefore the blending process was carried out based on the fuel availability in the industrial site. The results of blending using coal showed that the high heating value of mixed briquette product was achieved at elevated more coal content used. By paying attention to the standard heating value, the ratio composition of ash pond to coal, 20/80 satisfy for utilization, where the heating value was around 4600 kcal/kg. The blending proses using pyrolysis char of ash pond showed un significant effect on the increasing of heating value, for example in a 40/60 ratio, the difference between the two types materials was only 210 kcal/kg. Therefore, pyrolysis pretreatment of sludge ash pond had unsignificant impact compared to the energy expended to run the process
{"title":"Pemanfaatan Sludge Ash Pond PT. Cirebon Electrical Power (CEP) sebagai Bahan Bakar Alternatif","authors":"Agik Dwika Putra, Ilham Satria Raditya Putra, Rochim Bakti Cahyono","doi":"10.31315/e.v20i2.9845","DOIUrl":"https://doi.org/10.31315/e.v20i2.9845","url":null,"abstract":"As one of the power plants that uses coal as an energy source, PT Cirebon Electric Power (PT CEP) is committed to addressing waste problems with the 3R principle. Sludge ash ponds which is waste of the process production has the potential for alternative fuel. This study aims to evaluate the utilization of sludge ash ponds with the main target parameter in the form of calorific value. Based on proximate analysis, sludge pond ash only had a low heating value, around 210 kcal/kg, thus unbeneficial to be used as fuel directly. In order to make efficient utilization, a pyrolysis process was carried out to increase the existing heating value and was obtained at 700 – 870 kcal/kg. Generally, the standard of alternative fuel had minimum heating value of 4500 kcal/kg, therefore the blending process was carried out based on the fuel availability in the industrial site. The results of blending using coal showed that the high heating value of mixed briquette product was achieved at elevated more coal content used. By paying attention to the standard heating value, the ratio composition of ash pond to coal, 20/80 satisfy for utilization, where the heating value was around 4600 kcal/kg. The blending proses using pyrolysis char of ash pond showed un significant effect on the increasing of heating value, for example in a 40/60 ratio, the difference between the two types materials was only 210 kcal/kg. Therefore, pyrolysis pretreatment of sludge ash pond had unsignificant impact compared to the energy expended to run the process","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43832308","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 goal of this study was to investigate the effect of the concentration and the type of nitrogen sources in the cultivation medium on the production of biomass and biochemical content (carbohydrates, proteins, fats) in the Spirulina platensis biomass. Types of nitrogen sources included NaNO3 and urea, where the concentrations were varied from 0.5 to 3.5 g/L. The results showed that the use of urea tended to produce more S. platensis biomass than the use of NaNO3. The best concentrations that produced the highest biomass were NaNO3 2.5 g/L (biomass 0.6745 g/L) and urea 0.5 g/L (biomass 0.7158 g/L). The use of urea also tended to produce a higher specific growth rate and a shorter doubling time than the use of NaNO3. The high concentration of nitrogen sources caused the pH of the medium to increase more rapidly due to the accumulation of ammonium in the medium. Using NaNO3 can produce biomass with a higher protein content (28.34-36.98%) than using urea (25.86-33.52%).
{"title":"Pengaruh Perbedaan Jenis dan Konsentrasi Sumber Nitrogen (NaNO3 dan urea) terhadap Produksi Biomasa Spirulina Platensis","authors":"Iqbal Syaichurrozi, Yustinus Selis Toron, Sharfan Dwicahyanto, Wardalia Wardalia","doi":"10.31315/e.v20i2.9367","DOIUrl":"https://doi.org/10.31315/e.v20i2.9367","url":null,"abstract":"The goal of this study was to investigate the effect of the concentration and the type of nitrogen sources in the cultivation medium on the production of biomass and biochemical content (carbohydrates, proteins, fats) in the Spirulina platensis biomass. Types of nitrogen sources included NaNO3 and urea, where the concentrations were varied from 0.5 to 3.5 g/L. The results showed that the use of urea tended to produce more S. platensis biomass than the use of NaNO3. The best concentrations that produced the highest biomass were NaNO3 2.5 g/L (biomass 0.6745 g/L) and urea 0.5 g/L (biomass 0.7158 g/L). The use of urea also tended to produce a higher specific growth rate and a shorter doubling time than the use of NaNO3. The high concentration of nitrogen sources caused the pH of the medium to increase more rapidly due to the accumulation of ammonium in the medium. Using NaNO3 can produce biomass with a higher protein content (28.34-36.98%) than using urea (25.86-33.52%).","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47184389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Mustikaningrum, Desty Arista, R. D. Nyamiati, Dodi Eko Nanda
Piperine is a type of bioactive compound that can be isolated from black pepper. Currently the utilization of piperine is dominated by the health sector. In this study, piperine was isolated using the Soxhlet method. The purpose of this research is to propose a mathematical model to determine the value of the diffusivity (DA) of piperine, the extraction rate constant (k) and the piperine isolation equilibrium constant for commercial designs. Based on the results obtained the value of DA was obtained at 0.1878 m2/minute, the value of k was obtained at 0.0012 m/minute and the value of K was obtained at 0.900. Extraction was carried out using 96% ethanol solvent with a ratio of 25:1 to black pepper samples using the soxhletation method of 5 circulations. The resulting piperine extract was 55.46 mol/liter
{"title":"Evaluation of Diffusivity Values and Extraction Speed Constants on Black Pepper Piperine Isolation","authors":"M. Mustikaningrum, Desty Arista, R. D. Nyamiati, Dodi Eko Nanda","doi":"10.31315/e.v20i2.8996","DOIUrl":"https://doi.org/10.31315/e.v20i2.8996","url":null,"abstract":"Piperine is a type of bioactive compound that can be isolated from black pepper. Currently the utilization of piperine is dominated by the health sector. In this study, piperine was isolated using the Soxhlet method. The purpose of this research is to propose a mathematical model to determine the value of the diffusivity (DA) of piperine, the extraction rate constant (k) and the piperine isolation equilibrium constant for commercial designs. Based on the results obtained the value of DA was obtained at 0.1878 m2/minute, the value of k was obtained at 0.0012 m/minute and the value of K was obtained at 0.900. Extraction was carried out using 96% ethanol solvent with a ratio of 25:1 to black pepper samples using the soxhletation method of 5 circulations. The resulting piperine extract was 55.46 mol/liter","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45657796","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}
Polyethersulfone (PES) is the most common material in various medical and water treatment applications because of its excellent mechanical and thermal properties. The hydrophobicity of polyethersulfone is considered as one of the main drawbacks because the hydrophobic surface causes a high biofouling effect on the membrane, so it has limitations in using Polietersulfon PES membrane technology. Modification of PES membranes is an important topic to be continuously developed to improve the properties of PES membranes. Membrane modifications focus on increasing the hydrophilicity, selectivity, and stability of membranes that are expected to be used commercially. Modifications were made to change the hydrophobic membrane surface into a hydrophilic membrane with good mechanical properties by introducing hydrophilic properties and functional groups to the polyethersulfone membrane surface. This review includes reviews and discussions on modifying PES membranes by mixing, coating, and grafting methods. In particular, adding functional groups to polyethersulfone is a suitable method for introducing hydrophilic properties. The addition of nanomaterials to the surface of the polyethersulfone membrane by mixing, coating, grafting, and combinations significantly increases the surface of the membrane, and all modifications affect the surface roughness of the membrane.
{"title":"Metode Modifikasi Membran Polietersulfon (PES) Untuk Meningkatkan Antifouling−Mini Review Modifikasi Membran","authors":"Enny Nurmalasari, Hasnah Ulia, Apsari Puspita Aini, Agung Kurnia Yahya, Yunita Fahni","doi":"10.31315/e.v20i2.9596","DOIUrl":"https://doi.org/10.31315/e.v20i2.9596","url":null,"abstract":"Polyethersulfone (PES) is the most common material in various medical and water treatment applications because of its excellent mechanical and thermal properties. The hydrophobicity of polyethersulfone is considered as one of the main drawbacks because the hydrophobic surface causes a high biofouling effect on the membrane, so it has limitations in using Polietersulfon PES membrane technology. Modification of PES membranes is an important topic to be continuously developed to improve the properties of PES membranes. Membrane modifications focus on increasing the hydrophilicity, selectivity, and stability of membranes that are expected to be used commercially. Modifications were made to change the hydrophobic membrane surface into a hydrophilic membrane with good mechanical properties by introducing hydrophilic properties and functional groups to the polyethersulfone membrane surface. This review includes reviews and discussions on modifying PES membranes by mixing, coating, and grafting methods. In particular, adding functional groups to polyethersulfone is a suitable method for introducing hydrophilic properties. The addition of nanomaterials to the surface of the polyethersulfone membrane by mixing, coating, grafting, and combinations significantly increases the surface of the membrane, and all modifications affect the surface roughness of the membrane.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46141477","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}
Renung Reningtyas, Edia Rahayuningsih, Yuni Kusumastuti, Indria I Kartini
The use of nanomaterial as a finishing agent in the textile industry continues to be developed. Nanoparticle zinc oxide (ZnONP) has anti-UV properties so that it can be used to protect the color of the fabric from fading. Constraints of using nanomaterial as a functionalization agent on fabric are the process of application and also its poor adhesion. This research aims to optimize ZnONP coating on cotton-indigo fabric so that ZnONP can be maximized adsorbed with good durability. Optimization is carried out by the Response Surface Methodology (RSM) method, with the independent variables are: ZnoNP Dispersion volume, the number of coating, and the method of coating (with and without sonication assisted). The response variable is the adsorbed ZnONP in fabric sample after the washing process. The number of coating and sonication-assisted coating gives significant results in increasing the number of adsorbed ZnONP.
{"title":"Optimasi Aplikasi Pelapisan Nanopartikel Seng Oksida pada Kain Katun-Indigo dengan Response Surface Methodology","authors":"Renung Reningtyas, Edia Rahayuningsih, Yuni Kusumastuti, Indria I Kartini","doi":"10.31315/e.v20i2.9877","DOIUrl":"https://doi.org/10.31315/e.v20i2.9877","url":null,"abstract":"The use of nanomaterial as a finishing agent in the textile industry continues to be developed. Nanoparticle zinc oxide (ZnONP) has anti-UV properties so that it can be used to protect the color of the fabric from fading. Constraints of using nanomaterial as a functionalization agent on fabric are the process of application and also its poor adhesion. This research aims to optimize ZnONP coating on cotton-indigo fabric so that ZnONP can be maximized adsorbed with good durability. Optimization is carried out by the Response Surface Methodology (RSM) method, with the independent variables are: ZnoNP Dispersion volume, the number of coating, and the method of coating (with and without sonication assisted). The response variable is the adsorbed ZnONP in fabric sample after the washing process. The number of coating and sonication-assisted coating gives significant results in increasing the number of adsorbed ZnONP.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44682102","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}
Ilma Fadlilah, A. Pramita, Nurlinda Ayu Triwuri, Heni Anggorowati
The use of kepok banana peel activated carbon (AC-KPK) and nipa shell activated carbon (AC-TN) to adsorb phosphate ions in laundry waste has been successfully carried out. Characterization of activated carbon was carried out with SEM-EDX. The results of the morphological analysis showed that the pore sizes in AC-KPK and AC-TN were included in the macropore category. The elemental content of the AC-KPK adsorbent is C 74.9%; 23.6% O and 1.5% K, whereas in the AC-TN adsorbent it was observed that C elements were 70.7%; O 25.5%; K 2.0% and other elements such as Ca, Na, Mg and Cl are contained in small quantities. The optimum contact time needed by AC-KPK to adsorb phosphate ions in laundry wastewater is 15 minutes with an adsorption efficiency of 98.83%, the AC-TN adsorbent is 5 minutes with an adsorption efficiency of 99.52%, and the combination of AC-KPK&AC- TN resulted in a contact time of 5 minutes with an adsorption efficiency of 99.91%. The adsorption kinetics of phosphate ions with the three adsorbent media followed the pseudo second order model with adsorption rates for the adsorbents AC-KPK, AC-TN, and the combination AC-KPK & AC-TN respectively 3.9400 g/mg.min; -28.7119 g/mg.minute; and -10.8895 g/mg.min.
{"title":"Pemanfaatan Karbon Aktif Kulit Pisang Kepok dan Karbon Aktif Tempurung Nipah sebagai Biosorben untuk Pengolahan Limbah Cair Laundry","authors":"Ilma Fadlilah, A. Pramita, Nurlinda Ayu Triwuri, Heni Anggorowati","doi":"10.31315/e.v20i2.9681","DOIUrl":"https://doi.org/10.31315/e.v20i2.9681","url":null,"abstract":"The use of kepok banana peel activated carbon (AC-KPK) and nipa shell activated carbon (AC-TN) to adsorb phosphate ions in laundry waste has been successfully carried out. Characterization of activated carbon was carried out with SEM-EDX. The results of the morphological analysis showed that the pore sizes in AC-KPK and AC-TN were included in the macropore category. The elemental content of the AC-KPK adsorbent is C 74.9%; 23.6% O and 1.5% K, whereas in the AC-TN adsorbent it was observed that C elements were 70.7%; O 25.5%; K 2.0% and other elements such as Ca, Na, Mg and Cl are contained in small quantities. The optimum contact time needed by AC-KPK to adsorb phosphate ions in laundry wastewater is 15 minutes with an adsorption efficiency of 98.83%, the AC-TN adsorbent is 5 minutes with an adsorption efficiency of 99.52%, and the combination of AC-KPK&AC- TN resulted in a contact time of 5 minutes with an adsorption efficiency of 99.91%. The adsorption kinetics of phosphate ions with the three adsorbent media followed the pseudo second order model with adsorption rates for the adsorbents AC-KPK, AC-TN, and the combination AC-KPK & AC-TN respectively 3.9400 g/mg.min; -28.7119 g/mg.minute; and -10.8895 g/mg.min.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45496890","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}
Since corrosion causes considerable losses in many fields, including the economy, environment, society, industry, security, and safety, it is a major concern for the industrial and academic sectors. Damage control of materials based on organic compounds is currently a field of great interest. Because it is non-toxic, affordable, and effective in a variety of corrosive situations, pyrimidine has potential as a corrosion inhibitor. It takes a lot of time and resources to carry out experimental investigations in the exploration of potential corrosion inhibitor candidates. In this study, we evaluate the gradient boosting regressor (GBR), support vector regression (SVR), and k-nearest neighbor (KNN) algorithms as predictive models for corrosion inhibition efficiency using a machine learning (ML) approach based on the quantitative structure-property relationship model (QSPR). Based on the metric coefficient of determination (R2) and root mean square error (RMSE), we found that the GBR model had the best predictive performance compared to the SVR and KNN models as well as models from the literature for pyrimidine compound datasets. Overall, our study offers a new perspective on the ability of ML models to predict corrosion inhibition of iron surfaces
{"title":"Investigasi Model Machine Learning Berbasis QSPR pada Inhibitor Korosi Pirimidin","authors":"Muhamad Akrom, T. Sutojo","doi":"10.31315/e.v20i2.9864","DOIUrl":"https://doi.org/10.31315/e.v20i2.9864","url":null,"abstract":"Since corrosion causes considerable losses in many fields, including the economy, environment, society, industry, security, and safety, it is a major concern for the industrial and academic sectors. Damage control of materials based on organic compounds is currently a field of great interest. Because it is non-toxic, affordable, and effective in a variety of corrosive situations, pyrimidine has potential as a corrosion inhibitor. It takes a lot of time and resources to carry out experimental investigations in the exploration of potential corrosion inhibitor candidates. In this study, we evaluate the gradient boosting regressor (GBR), support vector regression (SVR), and k-nearest neighbor (KNN) algorithms as predictive models for corrosion inhibition efficiency using a machine learning (ML) approach based on the quantitative structure-property relationship model (QSPR). Based on the metric coefficient of determination (R2) and root mean square error (RMSE), we found that the GBR model had the best predictive performance compared to the SVR and KNN models as well as models from the literature for pyrimidine compound datasets. Overall, our study offers a new perspective on the ability of ML models to predict corrosion inhibition of iron surfaces","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46038035","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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