cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
konversi@ulm.ac.id
Editorial Address
-
Location
Kota banjarmasin,
Kalimantan selatan
INDONESIA
Konversi
Published by Universitas Lambung Mangkurat
ISSN : 23023686     EISSN : 25413481     DOI : -
Core Subject : Education,
Education
Arjuna Subject : -
Articles 263 Documents
 19   20   21   22   23 
CHARACTERISTICS OF EDIBLE FILM (LAYER BY LAYER) FROM CARRAGEENAN-CHITOSAN WITH THE ADDITION OF BELIMBING WULUH LEAF EXTRACT AS ANTIOXIDANT SUBSTANCE Rahmah Isnaeni; Anisa Fitri; Desi Nurandini; Arif Tirtana; Muhmmad Zeva Prayitno
Konversi Vol 11, No 1 (2022): APRIL 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v11i1.13081

Abstract

Packaging use from synthetic materials can have a negative impact for environment. One of the steps to reduce this impact with edible film packaging uses. Film can be defined as a thin layer of material, that usually composed by a polymer that allows for mechanical strengthening of a structured stand. The quality that continues to be improved from the edible film is antioxidant activity, namely by adding antioxidant substances such as flavonoids and phenols from starfruit leaf extract. As well as improving its mechanical quality by adding shrimp shell chitosan and using the layer by layer method. The purpose of this research is to find out characteristics of edible film from carrageenan-chitosan layer by layer and find the best results from the addition of different concentrations of chitosan and Belimbing Wuluh leaf extract. The variation that will be carried out is the addition of Belimbing Wuluh leaf extract by 0.2%, 0.4% and 0.6% and chitosan by 1.5%, 2% and 2.5%. The results showed that the best formula of edible film was made from 2.5% chitosan concentration and 0.6% Belimbing Wuluh leaf extract. The results of test are the thickness test is 0.21 mm, the tensile strength is 2.87 MPa, the elongation at break is 13.6673%, the water vapor permeability is 2.1682 g/m2h and the antioxidant value in terms of fruit weight loss is 4.01%. 
THE KINETIC STUDY OF METHYLENE BLUE ADSORPTION USING THE RED FRUIT WASTE BIOCHAR Yuni Rosita; Ahmad Tawfiequrrahman Yuliansyah; Rochim Bakti Cahyono
Konversi Vol 11, No 1 (2022): APRIL 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v11i1.12338

Abstract

Methylene blue is one of the dyes often used in the textile industry. This dye is toxic which causes environmental pollution and health problems for humans and animals. In this research, adsorption of methylene blue dye was carried out by using an adsorbent in the form of red fruit waste biochar in concentration variations (50, 100, and 150 ppm) and contact times (0, 20, 40, 60, 80, 100 and 120 minutes). The kinetics review modeling was based on the pseudo first order and pseudo second order to determine the adsorption capacity of methylene blue with red fruit waste biochar. The adsorption equation was evaluated using the Langmuir adsorption isotherm and the Freundlich adsorption isotherm. The results showed that the most suitable adsorption equilibrium model followed the Langmuir adsorption isotherm with an equilibrium constant (K) is 0.0510 and the maximum adsorption capacity (Qm) is 0.0048 mg/g. The kinetics model of the methylene blue adsorption reaction based on the pseudo second order with the value of k is 0.6973 min-1 and a relation coefficient value of R2 = 1.
REDUCTION OF CHROMIUM ION (Cr6+) WITH ION EXCHANGE RESIN IN LIQUID WASTE OF BATIK Abdurrahman Wahid; Neno Nidia Lifiana; Soemargono Soemargono; Nove Kartika Erliyanti
Konversi Vol 11, No 1 (2022): APRIL 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v11i1.12768

Abstract

Industri batik tergolong industri dalam jumlah besar dan berbahaya. Salah satu limbah yang dihasilkan adalah limbah cair yang mengandung ion krom (Cr 6+). Cairan limbah yang dikeluarkan sangat keruh, berwarna, dan memiliki pengelolaan yang busuk sehingga menimbulkan masalah serius bagi badan air, masyarakat, dan lingkungan. Limbah tanpa perlakuan khusus dibuang ke lingkungan. Sehingga metode pertukaran ion dapat mengurangi pencemaran lingkungan akibat limbah industri batik. Penelitian ini bertujuan untuk mengetahui pengaruh resin dalam menurunkan kandungan ion kromium pada limbah cair industri batik dengan menggunakan metode pertukaran ion. Yaitu dengan menggunakan dua kondisi operasi yang divariasikan yaitu berat resin (40, 60, 80, 100, dan 120 gram) dan kecepatan pengadukan (150, 175, 200, 225, dan 250 rpm). Ion kromium yang bermuatan positif akan bertukar dengan H +ion yang ditemukan dalam resin dowex. Sehingga kandungan krom pada limbah cair batik dapat dikurangi. Hasil tersebut diperoleh dari kecepatan pengadukan dan berat resin yang digunakan. Penurunan kandungan ion chromium tertinggi terjadi pada kecepatan pengaduk 250 rpm dengan berat resin 120 gram sebesar 97,86%.
ABSORBER DESIGN SIMULATION FOR CO2 USING K2CO3 ABSORBENT WITH ASPEN HYSYS V.10 SOFTWARE Chusnul Chotimah; Naja Nikmah Syafitri; Kartika Udyani
Konversi Vol 11, No 2 (2022): OKTOBER 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v11i2.14134

Abstract

An absorber is a tool used in the absorption process to separate a certain gas component from a gas mixture using a chemical solution as an absorbent. This simulation aimed to determine the effects of the packing type and column diameter on flooding, the packing type and column diameter on pressure drop, and the gas flow rate on CO2 removal. It also investigated the best absorber design based on %flooding and pressure drop. This simulation was carried out using the Aspen Hysys software version V.10. The variables of packing type consisted of PALL, berl, and raschig. The simulation results indicated that the larger the column diameter for each type of packing, the smaller the %flooding value. Meanwhile, the limit value of the %flooding for each type of packing given by Aspen Hysys was 30%– 80%. Further simulation results showed that the larger the column diameter in each type of packing, the smaller the pressure drop value. The pressure drop limit value given by Aspen Hysys was 3,658 mbar. In addition, the next simulation results demonstrated that the greater the value of the given gas flow rate, the greater the % CO2 removal value. Thus, the effective absorber design viewed from the %flooding and pressure drop was a 0.5-inch berl dimension with ceramic material. Keywords: absorber, type of packing, flooding, pressure drop, CO2 removai
BIODIESEL FROM PALM OIL WITH INTERESTERIFICATION PROCESS USING BIO-CATALYST CAJUPUT OIL Elvianto Dwi Daryono; Rini Kartika Dewi
Konversi Vol 11, No 2 (2022): OKTOBER 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v11i2.13982

Abstract

Proses interesterifikasi yang telah dilakukan menggunakan katalis homogen maupun heterogen yang perlu proses pemisahan di akhir reaksi. Minyak atsiri merupakan alternatif pilihan katalis yang lebih efisien sebab tidak perlu proses pemisahan di akhir reaksi karena berfungsi sebagai antioksidan untuk biodiesel dan lebih ramah lingkungan. Tujuan penelitian adalah untuk mendapatkan proses pembuatan biodiesel yang lebih efektif dan efisien yaitu dengan tahapan proses yang lebih sedikit sehingga akan mengurangi biaya produksi. Pada penelitian ini reaksi interesterifikasi minyak kelapa sawit dengan metil asetat untuk menghasilkan metil ester dan triasetin, dilakukan dengan bio-katalis  minyak kayu putih. Kondisi operasi penelitian adalah massa minyak kelapa sawit 250 gram, rasio molar minyak kelapa sawit:metil asetat adalah 1:6, suhu reaksi 60oC, kecepatan pengadukan 300 rpm, massa katalis 0,75% massa minyak kelapa sawit dan waktu reaksi (15, 30, 45, 60, dan 75 menit). Minyak kelapa sawit, metil asetat dan katalis direaksikan dalam labu leher tiga sebagai reaktor sesuai dengan kondisi operasi penelitian. Setelah waktu reaksi tercapai, sample sebanyak 50 gram diambil untuk dilakukan proses pemisahan. Hasil penelitian mendapatkan kondisi terbaik proses interesterifikasi minyak kelapa sawit dengan bio-katalis minyak kayu putih pada waktu reaksi 75 menit dengan crude yield 65,88% dan angka asam 0,426 mg KOH/gr sampel yang memenuhi SNI 7182:2015.
SYNTHESIS OF NATURAL GELATIN-BASED HARD CAPSULE SHELL FROM CASSAVA STARCH AND HIBISCUS LEAVES GEL Primata Mardina; Usman Usman; Muhammad Apriliawan Yoga Anggara
Konversi Vol 11, No 2 (2022): OKTOBER 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v11i2.14258

Abstract

The aim of this work was to prepare gelatin-based hard capsule shells from natural sources, cassava starch and hibiscus leaves. The effects of composition between cassava starch and hibiscus leaves, and temperature on capsule characteristic was investigated. Extraction and gelatinization were the main method which used in this study. A different compositions of cassava starch and hibiscus leaves gel was added into boiling flask for gelatinization for 2 h. Temperature was maintained at 50, 70 and 100 oC. The optimum resultwas obtained at ratio 8:1 of cassava starch and hibiscus leaves gel with 100 oC operation temperature which has specification  7.60% of ash content, 11.24% of moisture, and 15 min dissolution time.According to the result, this study is expected to be used as a reference for the development of natural gelatin-based hard capsule shell synthesis. 
CHARACTERISTICS ANALYSIS OF ADSORBENT FROM RUBBER TREE TRUNK AND RUBBER SEED SHELLS Desi Nurandini; Riani Ayu Lestari; Muhammad Zeva Prayitno; Isna Syauqiah
Konversi Vol 11, No 2 (2022): OKTOBER 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v11i2.14600

Abstract

The efforts to control heavy metal waste are developingg to obtain an economical, effective, and efficient method. One method that is widely used in industry is adsorption. In general, the use of conventional adsorbents requires relatively more expensive operational and regeneration costs, thus it is necessary to investigate alternative adsorbents derived from nature. Local commodities that can be taken as the basic material for adsorbents are rubber plants. In the rubber seed shell there are fibers containing cellulose, hemicellulose, lignin, and waxes. The rubber tree trunk at the base has a relatively high cellulose content (67.38%), the middle part has a cellulose content of (59.37%) and the end part has a cellulose content of (45.73%). Therefore, this study was conducted to determine the potential of rubber stems and rubber seed shell waste to be processed into adsorbents. The making of the adsorbent is preceded by the delignification stage and then followed by the activation process. Based on the characterization tests that have been carried out, it is known that the moisture content in the biosorbent of the rubber seed and shell is 10% and 11%, while the ash content is 1.23% and 2.33%, respectively. The volatile matter levels for the adsorbents from the stems and shells were 6.43% and 6.18%, respectively.The efforts to control heavy metal waste are developingg to obtain an economical, effective, and efficient method. One method that is widely used in industry is adsorption. In general, the use of conventional adsorbents requires relatively more expensive operational and regeneration costs, thus it is necessary to investigate alternative adsorbents derived from nature. Local commodities that can be taken as the basic material for adsorbents are rubber plants. In the rubber seed shell there are fibers containing cellulose, hemicellulose, lignin, and waxes. The rubber tree trunk at the base has a relatively high cellulose content (67.38%), the middle part has a cellulose content of (59.37%) and the end part has a cellulose content of (45.73%). Therefore, this study was conducted to determine the potential of rubber stems and rubber seed shell waste to be processed into adsorbents. The making of the adsorbent is preceded by the delignification stage and then followed by the activation process. Based on the characterization tests that have been carried out, it is known that the moisture content in the biosorbent of the rubber seed and shell is 10% and 11%, while the ash content is 1.23% and 2.33%, respectively. The volatile matter levels for the adsorbents from the stems and shells were 6.43% and 6.18%, respectively.
MASS BALANCE APPROACH AT PALM CARBON CYCLE Abdul Kahar
Konversi Vol 11, No 2 (2022): OKTOBER 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v11i2.13340

Abstract

Development of Indonesian palm oil industry, not only contributes positively to economic sector. Biggest challenge lies in the negative issues of oil palm development, namely environmental issues. Land use change, forest clearing, deforestation, peat land for palm plantation expansion are environmental issues because they are considered to disturb the balance of greenhouse gases. The use of non-standard fertilizers and POME processing can also increase CO2 emissions, which in turn will reduce carbon storage in vegetation and soil. Soil is the most potent organic carbon sink compared to plants. Soil is an organic carbon pool (reservoir) that accumulates organic carbon in and organic carbon out. The accumulated carbon is influenced by aboveground biomass, belowground biomass, necromass, litter and soil organic matter. So that the development of oil palm is accused of being one of the factors that play a role in soil organic carbon (SOC), soil carbon loss (SCL), net carbon balance (NCB), or greenhouse gasses (GHG) emissions. Where this is a very important component in the palm carbon cycle that has an impact on the global climate. The mass balance approach to the palm carbon cycle obeys the law of conservation of mass. The mass of palm carbon before and after processing is constant. This means that the total mass of palm carbon during the process does not change, only a phase change occurs, namely solid, liquid, and gas.
PROCESSING OF TEMPE LIQUID WASTE IN STAGES USING COMBINATION OF COAGULATION AND ELECTROCOAGULATION METHODS Lia Cundari; Faisal Akbar Adin; Asyeni Miftahul Jannah; Dyos Santoso
Konversi Vol 11, No 2 (2022): OKTOBER 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v11i2.14206

Abstract

The purpose of this study was to determine the effect of slow stirring time of flocculation and stress on the electrocoagulation process on turbidity levels and pH values of tempe liquid waste. The research method used is a combination of coagulation and electrocoagulation processes carried out in batches. Variations carried out were slow stirring time of flocculation (10, 15, 20, 25 and 30 minutes) and variation of voltage (3,6, and 9 volts). The results showed that the stirring time and electrocoagulation voltage affected the turbidity of the tempe liquid waste but did not affect the pH level of the tempe liquid waste. The best slow flocculation time was 20 minutes with a turbidity yield of 31.04 NTU and a percent removal of turbidity of 91.56%. The electrocoagulation voltage of 9 volts resulted in a turbidity of 2.01 NTU and a percent turbidity removal of 93.52%.
IRON ADSORPTION IN PEAT WATER BY SAGO WASTE ACTIVATED CARBON Awali Sir Kautsar Harivram; Isna Syauqiah; Muthia Elma; Erdina Lulu Atika Rampun; Dina Amryna Chairul Putri; Namira Ghina Safitri
Konversi Vol 11, No 2 (2022): OKTOBER 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v11i2.13752

Abstract

In South Kalimantan, peat water is the main water sources for local people. But peat water has high iron content. It cannot be consumed directly and need further treatment. Adsorption is the most common technology to treat peat water. The goal of this research is to study sago waste adsorbent for iron removal in peat water. Citric acid was employed as activating agent in the sago waste activated carbon adsorbent fabrication. Carbonization process was done at 300 ℃ with 70, 80, 90, 100, 110 and 120 minutes of time variation. After treatment using the adsorbent, iron content was tested via Atomic Absorption Spectrophotometry (AAS). While, Fourier Transform Infra-Red (FTIR) were carried out to investigate the functional groups of sago pith waste activated carbon (SPWAC) and sago pith waste unactivated carbon (SPWUC). The experiment results show iron could be removed until 82% with iron concentration of 0.05 mg/l at 80 minutes. SPWAC and SPWUC have functional groups such as alkenes (C-H and C=C), carbonyl (C=O and C-O) and hydroxyl (O-H). Fe concentrations are still meet water quality standard according to No. 492/Menkes/PER/IV/2010 which is 0.3 mg/L. Therefore, adsorption uses sago pith waste activated carbon is an effective and inexpensive water treatment.

Page 21 of 27 | Total Record : 263

 19   20   21   22   23 

Filter by Year

2012 2025


Reset
Filter By Issues
All Issue Vol 14, No 2 (2025): OCTOBER 2025 Vol 14, No 1 (2025): APRIL 2025 Vol 13, No 2 (2024): OKTOBER 2024 Vol 13, No 1 (2024): April 2024 Vol 12, No 2 (2023): OKTOBER 2023 Vol 12, No 1 (2023): April 2023 Vol 11, No 2 (2022): OKTOBER 2022 Vol 11, No 1 (2022): APRIL 2022 Vol 10, No 2 (2021): Oktober 2021 Vol 10, No 1 (2021): April 2021 Vol 9, No 2 (2020): Oktober 2020 Vol 9, No 1 (2020): April 2020 Vol 8, No 2 (2019): Oktober 2019 Vol 8, No 1 (2019): April 2019 Vol 7, No 2 (2018): Oktober 2018 Vol 7, No 1 (2018): April 2018 Vol 7, No 1 (2018): ARTICLE IN PRESS Vol 6, No 2 (2017): Oktober 2017 Vol 6, No 2 (2017): Oktober 2017 Vol 6, No 1 (2017): April 2017 Vol 6, No 1 (2017): April 2017 Vol 5, No 2 (2016): Oktober 2016 Vol 5, No 2 (2016): Oktober 2016 Vol 5, No 1 (2016): April 2016 Vol 5, No 1 (2016): April 2016 Vol 4, No 2 (2015): Oktober 2015 Vol 4, No 2 (2015): Oktober 2015 Vol 4, No 1 (2015): April 2015 Vol 4, No 1 (2015): April 2015 Vol 3, No 2 (2014): Oktober 2014 Vol 3, No 2 (2014): Oktober 2014 Vol 3, No 1 (2014): April 2014 Vol 3, No 1 (2014): April 2014 Vol 2, No 2 (2013): Oktober 2013 Vol 2, No 2 (2013): Oktober 2013 Vol 2, No 1 (2013): April 2013 Vol 2, No 1 (2013): April 2013 Vol 1, No 1 (2012): Oktober 2012 Vol 1, No 1 (2012): Oktober 2012 More Issue