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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 8 Documents
 1 
Search results for , issue "Vol 9, No 1 (2022): April 2022" : 8 Documents clear
Adsorption of Chromium Using Apu Wood (Pistia stratiotes L) Root Bioadsorbent and Modification of Apu Wood Root Hargono Hargono; David Joeventus C.S.W.; Devia Winisar; Muhammad Fahmi Zakaria
CHEMICA: Jurnal Teknik Kimia Vol 9, No 1 (2022): April 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i1.21603

Abstract

The adsorbent is a material used for the adsorption process. One alternative used in the selection of adsorbents is biological materials. One type of plant that can be used to adsorb heavy metals is Apu Wood. This study aims to examine the effect of Cr (VI) concentration on the adsorption capacity of adsorbent, examine the time adjustment to the adsorption capacity of adsorbent, examine the characterization of adsorbent using SEM and FTIR, assess the adsorption equilibrium using the Langmuir and Freundlich methods and the kinetics of the adsorption reaction using pseudo order 1 and pseudo order 2. In this study, variables are the concentration of initial solution Cr(VI) of 2, 4, 6, 8, and 10 ppm and contact time of 15, 30, 45, 60, and 75 minutes. The result of this research is the capacity of adsorption increases in line with the increase in the initial concentration of Cr(VI) solution as adsorbate. Contact time affects the capacity of adsorption where the longer the contact time, the adsorption capacity increases until it reaches equilibrium at 70 minutes. In SEM and FTIR analysis both tests showed that aluminum adsorbtion using apu wood adsorbent and its modification changed the composition of the function group and the structure of the adsorbent surface area. The Langmuir Isoterm model produces a greater value R2 than the Freundlich isotherm model which indicates that the adsorbent surface is in direct contact with adsorbate and adsorbate attaches to the active site of the adsorbent of only one layer (monolayer). Kinetics adsorption pseudo order 1 produces a value of R2 greater than kinetics adsorps pseudo order 2 which indicates the mechanism that occurs is the transfer of mass in addition to the use of electrons together between heavy metals Cr (VI) with apu wood root.
Innovation of Poly(Lactic Acid)/Carbon Black Composite as an Environment-Friendly Antistatic Packaging Andhika Talentyoadi; Monica Tashya Putri; Ivandre Ivandre; Mujtahid Kaavessina
CHEMICA: Jurnal Teknik Kimia Vol 9, No 1 (2022): April 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i1.22117

Abstract

Antistatic packaging mainly functions to protect an electronic device from damage caused by the electronic discharge. However, antistatic packaging is typically made with a polymer that's hard to decompose naturally, this can badly affect Indonesian environments considering Indonesian produce a lot of plastic waste. Therefore, environmentally friendly antistatic packaging could potentially alleviate several plastic wastes generated. Antistatic packaging made of Conductive Polymer Composite (CPC)  with Poly Lactic  Acid as its matrics have a biodegradable characteristic, biocompatibility, resistance to thermal and chemical influence. And the use of Carbon Black as its filler can increase the electrical conductivity of CPC. CB is synthesis by burning coconut shells and activation with H2SO4. The synthesis of CPC samples was carried out by 2 methods; melt blending using an extruder and solvent blending using chloroform solvent and stirring with a magnetic stirrer at 650 rpm at 60°C. The filler composition was varied, namely 0, 0.5, 0.1, 1.5% by weight of PLA for blending melt and 0, 1.5% by weight of PLA for blending solvent. The thermal properties of the sample were tested by DSC, it was found that the Melting Temperature of the sample was not much different from that of pure PLA with a difference of 0.4-2.2°C. With the FTIR test, it is known that the solvent has completely disappeared from the sample, and the conductivity test shows a increase in conductivity along with the addition of filler from 9,505x10-12 S/cm to 5,752x10-7 S/cm and 9,872x10-12 S/cm to 1,034x10-6 S/cm for melt and solvent method.
Chemical Properties of Red Rose (Rosa Indica L.) Herbal Tea with Variations of Temperature and Drying Time Titisari Juwitaningtyas; Amy Amalia
CHEMICA: Jurnal Teknik Kimia Vol 9, No 1 (2022): April 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i1.22208

Abstract

Red roses (Rosa Indica L.) are ornamental plants containing functional compounds that are good for health, such as antioxidants, vitamin C, and polyphenols. Due to the functional compounds in red roses, they can be processed into herbal teas. This study aims to determine the chemical nature of red rose herbal tea with variations in temperature and drying time. This study was designed using a Completely Randomized Design (CRD) consisting of two treatment factors: drying temperature T1= 50 oC, T2= 60 oC, T3= 70 oC, and drying time S1=2 hours, and S2=3 hours. The parameters measured were the water content in dried flowers, while the antioxidant activity and total phenol were carried out in steeping dried flowers. The study results were processed using a two-way ANOVA (analysis of variance). The results showed that temperature and drying time significantly affected moisture content, antioxidant activity, and total phenol of red rose herbal tea. Red rose herbal tea produced the lowest water content of 4.55% in sample T3S2, and the highest antioxidant activity was 54.01% in sample T1S1. The highest total phenol was 11.45 mg GAE/g in sample T1S1.
Effect of Temperature, Concentration, and Type of Plasticizer on Edible Pectin Film Characteristics of Mango Peel (Mangifera indica L.) Eka Wahyu Asriyanti; Muna Munisah; Erlando Rizki Dewanto; Muhammad Mujiburohman
CHEMICA: Jurnal Teknik Kimia Vol 9, No 1 (2022): April 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i1.20540

Abstract

Plastic is a polymer product that is widely used by the community and is generally non-degradable. Its high usage makes plastic a source of waste that is difficult to decompose. It is important to transform the use of degradable materials as packaging by the community in an effort to overcome plastic waste. The edible film is an environmentally friendly packaging medium, which is generally synthesized from a mixture of pectin, plasticizer, and tapioca starch by heating and stirring. This study aims to study the effect of mixing temperature, pectin concentration, and type of plasticizer on the characteristics of the edible film. The temperature was varied at 70 oC, 80 oC, and 90 oC, with variations in pectin concentrations of 1%, 2%, and 3%. The types of plasticizers used were glycerol, sorbitol, and polyethylene glycol (PEG 400). The characteristics of the edible film were tested from thickness, tensile strength, elongation, and solubility. In the range of variables studied, the optimum conditions for producing the best edible film characteristics were 70 oC, 3% pectin, and the plasticizer of glycerol, giving solubility of 0.670 g water/g edible film, the thickness of 0.392 mm, the tensile strength of 3.200 MPa, and elongation of 0.134.
Yield and Physicochemical Properties of Candlenut Oil by Microwave Assisted Extraction Shintawati Shintawati; Yatim R Widodo
CHEMICA: Jurnal Teknik Kimia Vol 9, No 1 (2022): April 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i1.22228

Abstract

Candlenut (Aleurites moluccana L) is one of the native plants of Indonesia, used as a spice and in the cosmetic industry. Candlenut seeds contain high oil content with unstable properties at high temperatures. Generally, candlenut oil production is carried out by direct heating and on a laboratory, scale using Soxhlet extraction with chemical solvents. Microwave heating has been widely used to extract the active compounds in plant materials. The study of candlenut oil extraction with microwaves is still limited. This study aims to identify the physicochemical properties and yield of candlenut oil extracted using the Microwave Assisted Extraction (MAE) method and compare it with solvent extraction. This research was conducted by varying the extraction time of 35 minutes, 70 minutes and 105 minutes. The results showed that candlenut oil produced by the MAE method had a density, refractive index, ALB content and saponification number of 0.867 g/ml, 1.477, 2.8085% and 212.9764 mgKOH/g sample with a yield of 38.50%.
Effect of Hydrolysis Time and Sulfuric Acid Concentration on Reducing Sugar Content on Corn Cob Hydrolysis Anisah Nur Jannah; Ahmad M Fuadi
CHEMICA: Jurnal Teknik Kimia Vol 9, No 1 (2022): April 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i1.20637

Abstract

Energy demand in Indonesia continues to increase, while the source of petroleum energy is a non-renewable energy source. This problem encourages people to seek alternative renewable and environmentally friendly fuels. Bioethanol is an alternative to replace petroleum energy that is environmentally friendly because it can be made from organic waste. The utilization of corncobs waste currently is not optimal. Corncobs are known to contain lignocellulose compounds, namely cellulose, hemicellulose, and lignin which are suitable as raw materials for making bioethanol. One of the conversions of lignocellulose into bioethanol is through hydrolysis. So in this study, the effect of hydrolysis time and sulfuric acid concentration (H2SO4) will be analyzed on the reducing sugar levels that will be produced because high reducing sugars will produce more bioethanol. The method of determining reducing sugar used is Nelson - Somogyi. The independent variables used were hydrolysis times that is 45 minutes, 90 minutes, 135 minutes, and 180 minutes, and the acid concentrations that are 5%, 10%, 15%, and 20% (1:20 w/v). The fixed variables used were corncob mass and hydrolysis volume, while the dependent variable was the reducing sugar content.
Preparation and Characterization of Mangrove (Rizhopora Mucronata) Charcoal-Epoxy Polymer Composite Althaf Irfan Fachrezy; Ryan Sutedja; Sartika Selang; Aster Rahayu; Maryudi - Maryudi
CHEMICA: Jurnal Teknik Kimia Vol 9, No 1 (2022): April 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i1.24472

Abstract

Composite materials have been widely developed and applied for various purposes. Polymer composites have excellent properties on mechanical strength and chemical resistance. This study aims to determine the strength of composite made of mangrove charcoal and epoxy since mangrove charcoal has a good character and is abundantly available. The mangrove charcoal was added into the epoxy-hardener matrix with a volume fraction of 10%, 20%, and 30%. The charcoal size was 40, 60, and 100 mesh. The highest tensile strength was found with a volume fraction of 10% with an average of 19.33 N/mm2 at a size variation of 100 mesh mangrove charcoal. The highest elongation at break was found with a volume fraction of 10% with an average of 5.233% at 100 mesh mangrove charcoal size.
Effects of Nutrients Ca and K on Anaerobic Digestion of Food Waste Firda Mahira Alfiata Chusna; Lukhi Mulia Sitophyta; Rachma Tia Evitasari
CHEMICA: Jurnal Teknik Kimia Vol 9, No 1 (2022): April 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i1.24538

Abstract

We often find food waste daily, especially on household and restaurant scales. Using food waste for helpful something, biogas is an alternative to reduce wasted waste and produce renewable energy. The anaerobic digestion process is a process that decomposes organic material into biogas with the help of microorganisms in conditions without oxygen. Adding nutrients in the anaerobic digestion process can positively affect biogas-producing microorganisms. One of the nutrients or nutrients studied this time is Ca and K. The provision of nutrient Ca has a positive effect, namely a significant increase in biogas production compared to without the addition of nutrients. However, adding K does not positively impact biogas production is inhibited. Excessive amounts of nutrient K can inhibit the process by inhibiting microorganisms in breaking down intermediate products into biogas. The largest volume of biogas produced for five days came from the reactor with the addition of nutrient Ca, which was 15072 cm3, while the control reactor and reactor with the addition of nutrient K produced biogas of 1648.5 cm3 and 15.7 cm3. The addition of nutrient Ca increases biogas production more than nine times.

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