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All Journal Reaktor International Journal of Science and Engineering (IJSE) International Journal of Renewable Energy Development TEKNIK METANA JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Lingkungan JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Bulletin of Chemical Reaction Engineering & Catalysis Communications in Science and Technology ASEAN Journal of Chemical Engineering Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Journal Of Sustainability Perspectives Pharmaceutical Sciences and Research (PSR) Journal of Sustainability Perspectives International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis
Dessy Ariyanti
Department Of Chemical Engineering, Universitas Diponegoro, Semarang 50275, Indonesia
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Public Health

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Journal : METANA

 1 
MIKROALGA SEBAGAI SUMBER BIOMASA TERBARUKAN: TEKNIK KULTIVASI DAN PEMANENAN Ariyanti, Dessy; Handayani, Noer Abyor
METANA Vol 6, No 02 (2010): Desember 2010
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.5 KB) | DOI: 10.14710/metana.v6i2.3431

Abstract

Abstract   For millennia, aquatic environment has been a source of food, minerals, and natural products to fulfill human’s need. In order to resolved problem due to increment of population, the development of product microalgae based which is one of renewable resource absolutely needed.   There are two important processes in biotechnology of microalgae, microalgae cultivation and harvesting. Common cultivation methods used in growing microalgae are open raceway pond system and closed photobioreactor system. While harvesting methods used is flocculation, centrifugation and filtration. This paper described briefly the methods used in cultivation and harvesting of microalgae.   Keywords: microalgae, cultivation, harvesting
Penentuan Proses Pretreatment untuk Pemanfaatan Limbah Kulit Singkong sebagai Bahan Baku Bioetanol melalui Hidrolisa Enzimatis menggunakan Aspergillus spp. Ariyanti, Dessy; Purbasari, Aprilina; Kusumayanti, Heny; Handayani, Noer Abyor
METANA Vol 15, No 1 (2019): Juni 2019
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (785.67 KB) | DOI: 10.14710/metana.v15i1.22965

Abstract

Ketergantungan terhadap bahan bakar fosil ini menjadi masalah besar yang sangat mendesak untuk segera diselesaikan. Salah satu langkah solusi yang bisa dilakukan adalah memanfatkan bioetanol lignoselulosa dari limbah kulit singkong sebagai alternatif pengganti. Permasalahan utama yang menghambat penggunaan kulit singkong sebagai bahan baku utama pembuatan bioetanol adalah belum adanya proses pretreatment dan hidrolisa yang terbukti efektif secara teknis maupun ekonomis untuk mengkonversi lignoselulosa yang terkandung dalam kulit singkong menjadi bentuk gula sederhana. Penelitian ini dilaksanakan untuk mengetahui efektifitas proses pretreatment dan hidrolisa untuk mengkonversi lignoselulosa yang terkandung dalam kulit singkong menjadi bentuk gula sederhana. Metode pretreatment asam (H2SO4) dan organosolv (Etanol + CH3COONa) terbukti dapat meningkatkan yield gula tereduksi hingga 50% dibandingkan dengan proses hidrolisa tanpa pretreatment. Yield hingga 78% dapat diperoleh pada proses pretreatment asam suhu 30oC, waktu 30 menit yang dilanjutkan dengan hidrolisa enzimatik dengan Aspergillus niger selama 48 jam. Peningkatan yield pada proses pretreatment organosolv (optimum 74% pada suhu 30oC, waktu 90 menit) masih dapat dilakukan dengan meningkatkan waktu operasi dan meningkatkan suhu operasi. Namun peningkatan suhu maupun penambahan waktu operasi berpengaruh terhadap analisa teknis dan ekonomis dari proses. Secara teknis, pretreatment organosolv lebih mudah dilakukan terutama pada proses dengan kondisi operasi atmosferik dibandingkan dengan pretreatment asam karena sifat bahan kimia yang digunakan dan penanganannya. Secara ekonomis, pretreatment asam lebih baik untuk diaplikasikan dibandingkan pretreatment organosolv, hal ini dikarenakan yield yang dihasilkan lebih tinggi pada kondisi proses atmosferik. Lignocellulose material derived from cassava peel can be utilized as raw material for bioethanol production. The utilization of this material can be part of solution in order to maintain Indonesia’s energy security which still majority covered by the fossil fuel. The main problem of lignocellulose conversion into bioethanol is their crystalline structures those make them really difficult to be converted into monomeric sugar prior fermentation to produce ethanol. The objective of this research is to find out the effectiveness of pre-treatment process prior enzymatic hydrolysis of lignocellulose contained on cassava peel. The result shows pre-treatment methods both acid (H2SO4) and organosolv (Etanol + CH3COONa) proved to be effective in order to increase the yield of total reducing sugar (TRS) until 50% after enzymatic hydrolysis compared to the sample without pre-treatment. Highest yield 78% can be achieved by applying acid pre-treatment under temperature 30oC and 30 minutes of process prior enzymatic hydrolysis by Aspergillus niger under temperature 35oC for 48 hours. Further optimization in organosolv pre-treatment can be conducted by increasing the temperature and prolong the process into certain extent. It should be noted that the above action could influence the feasibility of the organosolv pre-treatment technically and economically. From technical point of view, organosolv pre-treatment can be more feasible compared to acid pre-treatment (under atmospheric condition) as the reagents are easy to handle in terms of safety consideration. However, from economic side acid pre-treatment is more preferable as higher yield of the process and lower volume of chemical can be used in order to achieve the same amount of product. 
Enhanced adsorption property of TiO2 based nanoribbons produced by alkaline hydrothermal process Ariyanti, Dessy; Mo’ungatonga, Satriani; Gao, Wei
METANA Vol 16, No 2 (2020): Desember 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/metana.v16i2.33428

Abstract

TiO2 is a semiconductor material with endless potential for the development of renewable energy as well as in the environmental field application. With various methods, TiO2 nanostructures with various morphology, properties and application can be developed. In this paper, the synthesis of TiO2 based nanoribbons with high adsorption property produced by alkaline hydrothermal methods were investigated. Its morphology, crystal structure and physical properties were characterized using Scanning Electron Microscope (SEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) and Brunauer-Emmett-Teller (BET) surface area analysis. The result shows that by controlling the hydrothermal processing time, different morphology and structures of TiO2 nanoribbons with different adsorption properties can be obtained. The nanoribbons produced via alkaline hydrothermal method has width 200-300 nm and length up to several microns. It also possesses fair adsorption capacity over dyes (Rhodamine B and Methyl orange) considering its large surface area and high pore volume. 
Co-Authors Adi Saputra, Erwan Adrianus Kristyo Prabowo, Adrianus Kristyo Afiatin Afiatin Agnes Priska Tiarasukma Aji Prasetyaningrum Ambariyanto , Andri Cahyo Kumoro Aprilina Purbasari Apsari Puspita A. Azizah, Nadya Ummi Bakti Jos Bayu Samudra, Muhammad C Sri Budiyati Catarina Sri Budiyati Denny Nugroho Sugianto Desiyantri Siti P. Diah Susetyo Retnowati Dita Baeti Pridiana Erwan Adi Saputro Faishal Maulana Kusumah Filicia Wicaksana H Hadiyanto Hamzah, Fazlena Handayani, Elinna Putri Hapsari, Farida Diyah Heny Kusumayanti Herman Suryadi I N. Widiasa Intan Nurcahyani Junye Dong Junzhe Dong Khoirul Huda Lesdantina, Dina Maksum Radji Marcelinus Christwardana Mo’ungatonga, Satriani Noer Abyor Handayani Peter Kusnadi Purwanto Purwanto Purwoko, Agus Pury Diana Shintawati Saputra, Erwan Adi Setia Budi Sasongko Slamet Priyanto Srivastava, Vimal Chandra Wei Gao Wei Gao Wei Gao Yos Johan Utama