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INDONESIA
CHEMICA Jurnal Teknik Kimia
Published by Universitas Ahmad Dahlan
ISSN : 2355875X     EISSN : 23558776     DOI : 10.26555
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy
CHEMICA Jurnal Teknik Kimia ISSN, 2355-875X (print) 2355-8776 (online) is a journal that publishes manuscripts or scientific papers in Chemical Engineering. The scope of this journal covers chemical reaction techniques, separation, optimization, process control, process system engineering, waste treatment, food and material technology. Journals are published in print and online twice a year, in June and December by Chemical Engineering Program, Faculty of Industrial Technology, Universitas Ahmad Dahlan Yogyakarta.
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Articles 189 Documents
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Formation of Phosphate Crystals from Cow Urine Using Aeration System Batch Reactor Fadilah, Reza; Hanifah, Windia; Cendekia, Devy; Ramandani, Adityas Agung
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 2 (2023): August 2023 [Available online since October 02, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i2.26595

Abstract

The waste generated from the livestock sector is cow urine containing nitrogen, sulfur, phosphate, ammonium, sodium, manganese, iron, silica, chlorine, magnesium and calcium. The aim of this research is to reduce phosphate levels which will have an impact on the environment caused by cow urine which contains phosphate and ammonium and forms phosphate crystals using a batch reactor with an aeration system. The results of wastewater treatment using a batch reactor produce precipitate in the form of phosphate crystals which can be used as fertilizer for plants. This study used a completely randomized design (CRD) with two repetitions, namely with a comparison of the rate of aeration (air flow) 1 Lpm, 1.5 Lpm and 2 Lpm with the time used, namely 0 minutes, 60 minutes, 120 minutes, 180 minutes and 240 minute. Based on research that has been done, the highest aeration rate (air flow) in phosphate removal in cow urine waste is at 1 Lpm air flow with a time of 240 minutes and a phosphate removal efficiency of 84.8822%. Meanwhile, at an air flow of 1.5 Lpm with a time of 60 minutes and a phosphate removal efficiency of 95.4315%. At an air flow of 2 Lpm with a time of 240 minutes, the removal efficiency can only be 34.3421%. The content of phosphate crystals obtained from the XRF results was obtained at 3.173%. At an air flow of 2 Lpm with a time of 240 minutes, the removal efficiency can only be 34.3421%. The content of phosphate crystals obtained from the XRF results was obtained at 3.173%. At an air flow of 2 Lpm with a time of 240 minutes, the removal efficiency can only be 34.3421%. The content of phosphate crystals obtained from the XRF results was obtained at 3.173%.
Utilization of Bamboo Waste by Engineering Acid Hydrolysis (H2SO4) to Produce Furfural Compounds Fitri, Nur Hidayatul; Ramandani, Adityas Agung; Cendekia, Devy; Teguh, Dedi
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 2 (2023): August 2023 [Available online since October 02, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i2.26609

Abstract

Bamboo waste containing lignocellulosic can be used as a material for forming furfural compounds. Furfural is an intermediate product that is widely needed by the chemical industry in the manufacture of finished products such as resins, disinfectants, lubricating oils, synthetic rubber, and so on. This product can be produced from materials containing pentosan. The purpose of this study was to determine the effect of the delignification process on pentosan levels,yield and characterization of the resulting furfural, as well as the potential of pentosan to become furfural compounds. In this study the formation of furfural from bamboo waste was carried out using the acid hydrolysis method, with the independent variables namely cooking temperatures of 90 oC, 100 oC and 110 oC, H2SO4 concentrations of 5%, 10% and 15% and cooking times of 60 minutes, 90 minutes , and 120 minutes. Based on the results of research that has been done, it is known that the delignification process has an influence on the pentosan level, where the sample without delignification obtained a pentosan level of 11.10% and using the delignification process obtained a pentosan level of 14.67%. Characterization of furfural analysis results by color test showed a change in color to red and based on the results of GC-MS analysis at retention time 24.
Preliminary study of production electrolytic silicon from silica amorphous in alkaline media Rahman, Muhammad Miftahur; Siagian, Franky Michael Hamonangan; Nasution, Yogi Tri Putra; Astuti, Widi; Sutopo, Ulung; Petrus, Himawan Tri Bayu Murti
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 2 (2023): August 2023 [Available online since October 02, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i2.26735

Abstract

This study used direct electrowinning to examine the viability of producing silicon from amorphous silica in alkaline conditions. The Indonesian Dieng Geothermal Power Plant provided a sample of geothermal sludge with a high silica (SiO2) content. The samples were analyzed using various analytical techniques (XRF and XRD) before to electrolysis to ascertain their chemical composition and mineralogy. At low temperatures (30°C), the direct electrowinning method using amorphous silica suspended in sodium hydroxide (NaOH) was introduced. Current density adjustments were made to determine the direct electrowinning method's ideal operation. XRD and XRF analyses were performed on cathode deposits and residues in electrochemical cells to ascertain the chemical composition and current recovery. At a current density of 1250 A/m2, the low-temperature electrolysis current efficiency on natrium silicate solution can approach 34% recovery. Geothermal sludge was used to investigate the process, and the process's mediocre performance was caused by the problematic adsorption of amorphous silica particles on the cathode.
Effect of temperature and time on alkaline pretreatment and alkaline microwave-assisted pretreatment on banana stem composition Anggriani, Ulfa Meila; Novia, Novia; Melwita, Elda; Aprianti, Tine
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 3 (2023): December 2023 [Available online since December 26, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i3.27329

Abstract

Banana stem waste is a source of lignocellulose biomass with a high cellulose content and abundant availability in Indonesia. In this work, we investigated the effect of time and temperature on the decrease in rate of lignin in lignocellulose. Banana stem waste was pretreated with alkaline and alkaline microwave-assisted so that the percentage of lignin contained in lignocellulose biomass were reduced and the percentage of cellulose were increased. In alkaline pretreatment, 6% KOH is added to lignocellulose and heated to a hotplate during contact time variation (10, 20, 30, 40, and 50 min) with temperature variations (55, 65, 75, 85, and 95 oC). In pretreatment, an alkaline microwave–assisted 6% KOH solution was added to lignocellulose and heated for 20 min with temperature variations (55, 65, 75, 85, and 95 oC), then was put into a microwave that has a wave power of 360 Hz with variations in contact time (55, 65, 75, 85 and 95 min). After pretreatment, the sample was analyzed using the Chesson method to determine the percentage of cellulose, hemicellulose and lignin. Analysis showed that alkaline and microwave-assisted alkaline pretreatments effectively reduce the lignin percentage and increase the cellulose percentage in lignocellulose. The most remarkable performance in both pretreatments was obtained when working at 95 oC with a contact time of 50 min. Based on process optimization, it was concluded that microwave-assisted alkaline pretreatment reduced the percentage of lignin more and increased the percentage of cellulose compared to alkaline KOH pretreatment, which decreased the rate of lignin by 43.26% and increased the rate of cellulose by 60.68%. For further research, it can be continued to the next process, namely hydrolysis to produce glucose as a raw material for the bioethanol production process.
Production Precipitated Calcium Carbonate (PCC) using Continuous Stirred Bubble Reactor (CSBR) Sari, Ellyta; Arief, Syukri; Zulhadjri, Zulhadjri; Desmiarti, Reni; Amir, Amelia; Ramadhani, Umi; Agtata, Shazvelia Dwi; Anggreini, Sri
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 3 (2023): December 2023 [Available online since December 26, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i3.27356

Abstract

Precipitated calcium carbonate (CaCO3) has advantages such as small white and fine particle size, high homogeneity, and uniformity of particle shape so it is a product that is much sought after by various types of industry. PCC synthesis must be accompanied by the use of an efficient type of reactor for the reaction. PCC can be synthesized via a carbonation method that utilizes CO2 gas. This research aims to optimize all processes that occur in the PCC production circuit using a CSBR reactor in the form of a tank reactor to optimize the PCC synthesis process from the previous reactor and accommodate the number of tools to be economical. This research aims to optimize all processes that occur in the PCC production circuit using a CSBR reactor in the form of a tank reactor to optimize the PCC synthesis process from the previous reactor and accommodate the number of tools to be economical. Based on the research results, the PCC synthesis process is influenced by the type of solvent, temperature, CO2 gas flow rate, reaction time, and reactor type. The performance of the CSBR reactor was carried out using variations of R1, R2, R3, and R4 using the carbonation method, resulting in the highest purity and yield of 94.6% and 92.08%.
Effect of Acrylamide and Potassium Persulfate on The Characteristics of Water Hyacinth-Carrageenan Bead Gel Using Microwave Grafting Method Distantina, Sperisa; Putra, Novan Aldian Rahmadan; Naryani, Rahma Fitri; Kaavessina, Mujtahid
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 3 (2023): December 2023 [Available online since December 26, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i3.27389

Abstract

The cellulose of water hyacinth (Eichhornia crassipes) was utilized as raw material in bead gel production. In this research, hydrogel was prepared by grafting of acrylamide (AA) monomers onto the water hyacinth cellulose as the backbone using the microwave to produce hydrogel. This research aimed to determine the influence of adding AA and potassium persulfate (PPS) as an initiator on characteristic of swelling capacity in water. The cellulose powder obtained from the stem of water hyacinth was immersed in NaOH solution (1.5 N) for the delignification process for 10 min. The resulted cellulose was mixed with water and varying additions of 4, 7, dan 10 g acrylamide (AA) and 0.05, 0.10, and 0.15 g PPS to undergo grafting reaction.  The obtained gel was washed and soaked in the acetone to remove the unreacted AA and PPS. The resulting precipitated solid was dried and called Water Hyacinth  Cellulose Grafted Polyacrylamide (WH cellulose-g-PAA). The mixture of carrageenan with WH cellulose-g-PAA underwent crosslinking using aqueous KCl and CaCl2 after passing through palm oil layer to form bead gel. The properties of the dried bead gel were tested for functional groups using FTIR and for swelling capacity in water. Based on the FTIR test results, it can be concluded that AA monomers were successfully grafted onto the water hyacinth cellulose backbone. The addition of AA that is too low or too high will reduce the swelling capacity, as well as PPS.
Characterisasion and Rate Determination of Lipid Extraction From Nannochloropsis Using Stirring Method Nirmalasari, Jiran; Setyawan, Martomo; Jamilatun, Siti; Suhendra, Suhendra; Othman, Mohamad Rizza
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 3 (2023): December 2023 [Available online since December 26, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i3.27752

Abstract

The rapid growth of global population causes increasing energy needs. The energy needs currently used depend on fossil fuels which are non-renewable energy sources. An alternative to solve this problem is to use renewable fuel. One alternative to reduce the use of fossil fuels is microalgae. The microalgae used in this research is Nannochloropsis sp. Because it contains quite a lot of lipids, it has the potential to be used as a raw material for making biodiesel 42.315% of the fatty acids contained in Nannochloropsis are palmitoleic. This research was conducted to determine the total lipid content and percent extraction yield. The method used in this research is mixing methods. Extraction times were 30 minutes, 60 minutes, 90 minutes and 120 minutes. The greatest total lipid content was obtained at 120 m inutes with the amount obtained being 10.46%. Meanwhile, the highest percentage of results obtained was at 120 minutes, namely 10.46%. The optimum extraction speed is in the range of 0 to 30 minutes with a speed of 0.0305% with a lipid recovery of around 90% of the lipids produced.. The research results obtained showed that the extraction time affected the results obtained in terms of total lipid content and percent yield. The longer the extraction time, the greater the lipid content and percent yield obtained.
Effect of pH on Swelling Ratio and Fluorescence of Quantum Dots (QDs) Based Hydrogel (CuInS2/ZnS QDs) Permadi, Adi; Hadi, Sofyan; Sinaga, Alexander MT; Pitoyo, Joko; Chang, Jia-Yaw
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 2 (2023): August 2023 [Available online since October 02, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i2.27801

Abstract

Quantum dots (QDs) are semiconductor materials possessing a distinct electrical order and physical dimensions less than the excitation of the Bohr radius. The innovative combination of hydrogel and QDs has a broad range of applications in critical areas like the environment, health, and energy. QDs hydrogel has been applied as a biosensor and in the waste processing industry. The main characteristics of QDs hydrogel are fluorescence and swelling ratio. In the waste processing industry, the swollen hydrogel provides a more porous matrix that allows heavy metal to penetrate the hydrogels via passive diffusion. In the biosensor application, QDs hydrogel can be used as active sensors by changing the fluorescence properties when reacting with analytes, or by conjugating antibodies to the dot surface to act as passive label probes. This study aims to study the effect of pH on the fluorescence and swelling ratio of CuInS2/ZnS hydrogel.  CuINS2/ZnS hydrogel is synthesized by sonication a mixture consisting of QDs (CuInS2/ZnS), N-(3-aminopropyl) methacrylate, polyethylene glycol methacrylate, methylene bis acrylamide, and ammonium persulfate solution for 5 min with amplitude of 20 kHz. CuInS2/ZnS acts as QDs component, while N-(3-aminopropyl) methacrylate, polyethylene glycol methacrylate, methylene bis acrylamide, and ammonium persulfate act as hydrogel synthesizing components. The QDs hydrogel was then immersed in water with varying pH to observe the effect of pH on fluorescence and swelling ratio. The results show that increasing pH will reduce the swelling ratio and increase the fluorescence strength. CuInS2/ZnS hydrogel has a maximum swelling ratio at a pH of 5 and provides strong fluorescence at pH of 7, 9, and 11. The result also revealed that CuInS2/ZnS hydrogel has sufficient fluorescence and swelling ratio characteristic at the pH level of the biological fluid of the human body namely 7.35-7.45, this suggests the biological application of CuInS2/ZnS hydrogel such as for drug delivery and biosensing.
Evaluation and Comparison Anti-aging Facial Serum from Algae Extract Permadi, Adi; Aziz, Abdul; Ramadani, Noorpani; Nazzal, Sami; Maryudi, Maryudi; Suharto, Totok Eka
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 3 (2023): December 2023 [Available online since December 26, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i3.27898

Abstract

The demand for cosmetics in Indonesia is quite high so cosmetics can now be said to be a primary need. Therefore, various cosmetic products have emerged that are cheap and provide instant results but ignore the health aspects of the user. Several cosmetic products make a breakthrough by using natural ingredients. One natural material that can be used is microalgae which can produce bioactive compounds and has a relatively faster production process compared to other natural materials. In this research, the microalgae used were Chlorella sp. and Spirulina sp., and Sargassum sp. This research aims to make a serum based on the Chlorella sp., Spirulina sp. and Sargassum sp. microalgae. The research results showed that the standard testing of simplicial facial serum extracts of Spirulina sp., Chlorella sp., and Sargassum was by SNI No. 16-4399-1996.[ASUS1] [AP2]  All the metrics analyzed, such as organoleptic characteristics, pH, specific gravity, viscosity, active compounds, and microbiological contamination, have successfully fulfilled the required requirements in SNI no. 16-4399-1996.. The results of antioxidant activity testing showed that Chlorella sp. had higher antioxidant activity than the other three types of samples. However, the antioxidant results obtained are still very low and relatively weak, which means this serum does not fully contribute to antiaging. Further research needs to be carried out to obtain serum from microalgae with high levels of antioxidants, including by using fresh simplicia, elevated algae concentration or optimizing the operating conditions.     [ASUS1]Please add short information about the main results, whether the serum satisfies the standard or not, which parameters, etc. [AP2]Has been added

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