Garuda - Garba Rujukan Digital

Uji Aktivitas Karbon Aktif Tongkol Jagung Terimpregnasi Fe2O3 sebagai Biosorben Limbah Warna Metilen Blue Fauzan Irfandy; Yuli Ristianingsih; Alit Istiani
Eksergi Vol 18, No 2 (2021)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v0i0.4536

Methylene blue is one of dying waste that causes harmful effect both enviromental and public health risks. A method to overcome the problem is to adsorb it with the activated carbon. Apart from that, corn cob is potential biomass with can convert to activated carbon. The aim of this research is to syntethic and to modify corn cob activated carbon with iron oxide. It is expected to increase the afinity of methylene blue to the activated carbon surface. The modification is done by wet impregnation and the effectiveness of the impregnated corn cob activated carbon is studied by analyse the persen removal of methylene blue in every interval time. The result show that in the concentration range of Fe load impregnation between 1%-3% which has been used, the corn cob activated carbon with concentration of Fe load 2% has the most optimum ability in methylene blue adsorption with the adsorption capacity 44,9%. Moreover, the effect pH shows that in acidic condition the adsorption of methylen blue is better than in netral condition

Simulation of Nitrogen Release from Chitosan/Local Organic Fertilizer Composite as Slow-Release Fertilizer Alit Istiani; Yuni Kusumastuti; Rochmadi rochmadi
Jurnal Rekayasa Proses Vol 14, No 2 (2020)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.50341

The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to overcome this limitation is applying organic fertilizer as a slow-release fertilizer (SRF). The objective of this research is to prepare SRF by modifying the formulation of local organic fertilizer with chitosan as a binder. The rate of the nitrogen release was studied and simulated with MATLAB. The result shows that the nitrogen loss by water leaching decreased up to 85% in chitosan/organic fertilizer rather than the fertilizer without chitosan. By MATLAB simulation, the release of nitrogen has followed the proposed mathematical model in which the mass transfer occurred dominated by diffusion mechanism with the diffusivity coefficient of 1.61x10-5 cm2/s.Keywords: chitosan; organic fertilizer; slow-release fertilizer A B S T R A KPenggunaan pupuk anorganik masih memiliki efisiensi rendah yang disebabkan oleh cepatnya pelepasan nutrisi pupuk ke lingkungan sehingga nutrisi tersebut tidak dapat terserap baik oleh tanaman. Selain itu, aplikasi pupuk anorganik yang berulang dalam satu periode tanam berdampak pada peningkatan biaya operasional. Salah satu metode untuk mengatasi permasalahan tersebut adalah dengan menggunakan pupuk lepas lambat (slow-release fertilizer) atau dengan menggunakan pupuk organik. Tujuan pada penelitian ini adalah dengan mengombinasikan dua metode tersebut yaitu dengan memodifikasi formulasi dari pupuk organik lokal dengan penambahan kitosan sehingga dapat diperoleh pupuk organik yang memiliki sifat lepas lambat. Laju pelepasan nitrogen dari pupuk yang dihasilkan kemudian dianalisis dan disimulasikan dengan software MATLAB. Hasil penelitian menunjukkan bahwa nitrogen yang hilang pada komposit pupuk organik-kitosan melalui water leaching menurun hingga 85% jika dibandingkan dengan komposit pupuk organik tanpa kitosan. Hasil simulasi MATLAB juga menunjukkan bahwa laju pelepasan nitrogen pada pupuk mengikuti model matematika yang diusulkan yaitu dengan mekanisme difusi, nilai koefisien difusivitas yang diperoleh adalah sebesar 1,61×10-5 cm2/s.Kata kunci: kitosan; pupuk lepas lambat; pupuk organik

Mathematical Model of Water Absorption in Arrowroot Starch-Chitosan Based Bioplastic Yusmardhany Yusuf; Fauzan Irfandy; Alit Istiani
Eksergi Vol 19, No 1 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i1.6310

Expansion of the size of the weight of bioplastics often occurs in daily use. This phenomenon happens because the material from bioplastics can absorb significant amounts of water. This process can lead to accumulation of swelling degree. Therefore, a mathematical model is needed to quantify this mechanism to predict the dynamics of changes in the weight of bioplastics with respet to time while contact with water to help practitioners during application design for the use of bioplastics. This study aims to build a mathematical model derived from the mass sense validated by experimental data through curve fitting. The experiment was conducted by observing the rate of change in the mass of bioplastic made from starch and chitosan by measuring the change in mass concerning time immersed in water under atmospheric conditions. The immersion time was varied between 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40,50, and 60 minutes. As a result, it can be concluded that starch-chitosan-based biofilms can absorb water up to ±10.9174 gr-water/gr-bioplastic, and also this phenomenon can be quantified by a mathematical equation that derived from mass balance with an average percent error of 1.13% and R-squared coefficient of 0.9981.

Simulation of Nitrogen Release from Chitosan/Local Organic Fertilizer Composite as Slow-Release Fertilizer Alit Istiani; Yuni Kusumastuti; Rochmadi rochmadi
Jurnal Rekayasa Proses Vol 14, No 2 (2020)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.50341

The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to overcome this limitation is applying organic fertilizer as a slow-release fertilizer (SRF). The objective of this research is to prepare SRF by modifying the formulation of local organic fertilizer with chitosan as a binder. The rate of the nitrogen release was studied and simulated with MATLAB. The result shows that the nitrogen loss by water leaching decreased up to 85% in chitosan/organic fertilizer rather than the fertilizer without chitosan. By MATLAB simulation, the release of nitrogen has followed the proposed mathematical model in which the mass transfer occurred dominated by diffusion mechanism with the diffusivity coefficient of 1.61x10-5 cm2/s.Keywords: chitosan; organic fertilizer; slow-release fertilizer A B S T R A KPenggunaan pupuk anorganik masih memiliki efisiensi rendah yang disebabkan oleh cepatnya pelepasan nutrisi pupuk ke lingkungan sehingga nutrisi tersebut tidak dapat terserap baik oleh tanaman. Selain itu, aplikasi pupuk anorganik yang berulang dalam satu periode tanam berdampak pada peningkatan biaya operasional. Salah satu metode untuk mengatasi permasalahan tersebut adalah dengan menggunakan pupuk lepas lambat (slow-release fertilizer) atau dengan menggunakan pupuk organik. Tujuan pada penelitian ini adalah dengan mengombinasikan dua metode tersebut yaitu dengan memodifikasi formulasi dari pupuk organik lokal dengan penambahan kitosan sehingga dapat diperoleh pupuk organik yang memiliki sifat lepas lambat. Laju pelepasan nitrogen dari pupuk yang dihasilkan kemudian dianalisis dan disimulasikan dengan software MATLAB. Hasil penelitian menunjukkan bahwa nitrogen yang hilang pada komposit pupuk organik-kitosan melalui water leaching menurun hingga 85% jika dibandingkan dengan komposit pupuk organik tanpa kitosan. Hasil simulasi MATLAB juga menunjukkan bahwa laju pelepasan nitrogen pada pupuk mengikuti model matematika yang diusulkan yaitu dengan mekanisme difusi, nilai koefisien difusivitas yang diperoleh adalah sebesar 1,61×10-5 cm2/s.Kata kunci: kitosan; pupuk lepas lambat; pupuk organik

Kesetimbangan Adsorbsi Zat Warna Metilen Blue dengan Adsorben Karbon Aktif Tongkol Jagung Terimpregnasi Fe2O3 Yuli Ristianingsih; Alit Istiani; Fauzan Irfandy
Jurnal Teknologi Agro-Industri Vol 7 No 1 (2020): Jurnal Teknologi Agro-Industri
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat, Politeknik Negeri Tanah Laut

Methylene blue merupakan zat warna organik yang banyak digunakan pada industri tekstil, memiliki sifat mudah larut dalam air dan berbahaya bagi kesehatan manusia. Pada penelitian ini, adsorbsi zat warna metilen blue dilakukan dengan menggunakan adsorben karbon aktif dari tongkol jagung yang terimpregnasi Fe2O3. Proses adsorbsi dijalankan pada sebuah reaktor batch selama 120 menit dengan menggunakan adsorben KAJ/Fe2O3 sebanyak 0,025 gram dan kecepatan pengadukan 150 rpm. Tujuan penelitian ini adalah untuk mempelajari pengaruh suhu (30 0C, 40 0C, 50 0C) serta variasi penambahan reagen fenton H2O2 dan tanpa penambahan H2O2 pada proses adsorbsi zat warna metilen blue. Hasil penelitian diperoleh bahwa penambahan reagen fenton (H2O2) dapat meningkatkan kapasitas adsorbsi sebesar 25,98%. Suhu optimum proses adsorbsi terjadi pada suhu 30 0C dengan kapasitas penjerapan rata-rata sebesar 71,93%. Model kesetimbangan adsorbsi yang sesuai pada penelitian ini ada isotherm Langmuir dengan nilai konstanta Langmuir (b) dan kapasitas penjerapan maksimum (qm) yang diperoleh masing-masing sebesar 0,49 dan 15,38 mg/L.

Adsorption Equilibrium of Methylene Blue By Activated Carbon From Post-Anthesis Male Flower Palm Oil Waste Yuli Ristianingsih; Indriana Lestari; Alit Istiani
Eksergi Vol 19, No 3 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i3.8055

Methylene blue (MB) is wastewater from the textile industry. This dye is difficult to degrade naturally because it has a benzene group in its chemical chain. There are several ways to reduce waste, one of the economical ways is by using adsorption. In this study, MB was adsorbed using activated carbon from post-anthesis male flower palm oil (PAMF) waste which was activated using potassium hydroxide (KOH). The adsorption process was carried out at various temperatures (30, 40, and 50℃). The results showed that the addition of a KOH activator could increase the sorption capacity of methylene blue by 25.64%. The optimum temperature is suitable for the adsorption process of methylene blue with activated carbon of PAMF waste activated by KOH at a temperature of 30℃ with an adsorption capacity of 58.4793%. The adsorption equilibrium mechanism was studied using two types of adsorption isotherm models, namely the Langmuir and Freundlich models. Based on the data obtained, the MB adsorption process on activated carbon was compatible with the Freundlich model an R2 of 0.9557.

Physical Property Analysis of Biodegradable Film Made from Garut Starch, Glycerol, and Citric Acid Alit Istiani; Yusmardhany Yusuf; Fauzan Irfandy; Mitha Puspitasari
Eksergi Vol 19, No 3 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i3.6123

The biodegradable film is an attempt to reduce the use of plastics that cannot be decomposed by nature. This study described biodegradable films produced from arrowroot starch using the casting method. As a plasticizer and crosslinker, glycerol and citric acid are added. The investigation results indicate that the biodegradable film has a clear white color; the greater the amount of starch, the more opaque the color. The tensile strength test results also indicate that the biodegradable film’s tensile strength will be greater the more starch is used, but its percent elongation at break will decrease, or its characteristics will become less elastic. In contrast, adding citric acid demonstrates that the tensile strength decreases due to the hydrolysis of glycosidic linkages in starch.

Studi Isoterm Adsorbsi dan Termodinamika Pada Proses Penyisihan Ion Fe (III) Menggunakan Pektin dari Kulit Pisang Lestari, Indriana; Ristianingsih, Yuli; Istiani, Alit; Anasstasia, Titi Tiara
Eksergi Vol 20, No 3 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i3.10033

Adsorben berupa pektin berhasil diekstraksi dari kulit pisang menggunakan larutan asam kuat dan telah digunakan untuk menyisihkan ion Fe3+ dalam air. Pengaruh berbagai parameter terhadap proses adsorbsi, seperti waktu kontak, pH larutan, dosis adsorben, dan temperatur adsorbsi diinvestigasi dalam suatu sistem batch. Konsentrasi ion Fe3+ dalam larutan air diukur menggunakan Atomic Absorption Spectrometry . Efisiensi adsorbsi terbaik diperoleh pada waktu kontak selama 4 jam, pH larutan 2, dosis adsorben sebesar 3 g, dan temperatur 20oC. Mekanisme proses adsorbsi dan perubahan energi bebas Gibbs, entalpi, serta entropi telah dievalusi. Model isoterm Freundlich dan Temkin paling sesuai untuk menggambarkan mekanisme adsorbsi ion Fe3+ pada pektin dengan R2 berturut-turut 0,9871 dan 0,9591. Data parameter termodinamika membuktikan bahwa adsorpsi ion Fe3+ bersifat eksotermis dan berlangsung secara tidak spontan pada rentang temperatur 20 hingga 60ᵒC. Penelitian ini menunjukkan bahwa kulit pisang dapat dimanfaatkan sebagai adsorben murah yang menjanjikan untuk menghilangkan ion Fe3+ dalam air.

Karakterisasi Edible Film dari Pektin Kulit Durian, Pati Singkong, dan Gliserol istiani, Alit; Wardani, Nina Anggita; Kafiya, Maftuh; Hanifah, Nada Alya; Nukhia, Zulfatun
Eksergi Vol 21, No 1 (2024)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v21i1.10949

Kulit durian merupakan biomassa yang mempunyai potensial sebagai sumber pektin. Salah satu pemanfaatan pektin adalah digunakan dalam pembuatan edible film yang merupakan lapisan tipis dan memiliki fungsi sebagai pengemas atau pelapis makanan, sertadapat dimakan sekaligus dengan produk yang dikemasnya. Untuk memanfaatkan kulit durian tersebut dalam penelitian ini dibuat edible film dengan bahan pati singkong, gliserol dan pektin kulit durian. Pengaruh konsentrasi pektin dan pengaruh konsentrasi gliserol terhadap karakteristik edible film yang dihasilkan akan dikaji dengan melihat ketebalan, uji kuat tarik, persen elongasi, dan daya serap air nya. Hasil menunjukkan bahwa pada variasi perbandingan massa pektin diperoleh bahwa peningkatan konsentrasi pektin dapat menambah kuat tarik dan elongasi edible film, namun peningkatan konsentrasi pektin tersebut tidak berpengaruh signifikan terhadap ketebalan dan daya serap edible film. Adapun pada variasi perbandingan massa gliserol diperoleh bahwa peningkatan konsentrasi gliserol dapat meningkatkan persen elongasi, kuat tarik, dan daya serap air edible film. Namun penambahan gliserol yang berlebih akan mengurangi nilai kuat tarik dan daya serap air edible film. Pada variasi penambahan pektin didapatkan hasil karakteristik yang terbaik adalah pada perbandingan massa pati:gliserol:pektin 3:1:1,25 dengan nilai ketebalan edible film sebesar 0,112 mm, nilai kuat tarik sebesar 9,32 N, dan nilai persen elongasi sebesar 79,59%.

Simulation of nitrogen release from chitosan/local organic fertilizer composite as slow-release fertilizer Alit Istiani; Yuni Kusumastuti; Rochmadi
Jurnal Rekayasa Proses Vol 14 No 2 (2020): Volume 14, Number 2, 2020
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.50341

The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to overcome this limitation is applying organic fertilizer as a slow-release fertilizer (SRF). The objective of this research is to prepare SRF by modifying the formulation of local organic fertilizer with chitosan as a binder. The rate of the nitrogen release was studied and simulated with MATLAB. The result shows that the nitrogen loss by water leaching decreased up to 85% in chitosan/organic fertilizer rather than the fertilizer without chitosan. By MATLAB simulation, the release of nitrogen has followed the proposed mathematical model in which the mass transfer occurred dominated by diffusion mechanism with the diffusivity coefficient of 1.61x10-5 cm2/s.

Title

Found 13 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 13 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 13 Documents
Search