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All Journal Program Kreativitas Mahasiswa - Penelitian Indonesian Journal of Chemistry Jurnal Teknik Kimia Indonesia
Suryadi Ismadji
Teknik Kimia, Teknik, Universitas Katolik Widya Mandala Surabaya
Chemical Engineering, Chemistry & Bioengineering Chemistry

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KONVERSI LUMPUR AKTIF MENJADI BIODIESEL DENGAN PROSES SUBKRITIS TANPA KATALIS SECARA INSITU Gunawan, Farrel; Gunawan, Iwan; Palinggi, Sarah Yarden; Ayucitra, Aning; Ismadji, Suryadi
Program Kreativitas Mahasiswa - Penelitian PKM-P 2013
Publisher : Ditlitabmas, Ditjen DIKTI, Kemdikbud RI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (384.736 KB)

Abstract

Nowadays, biodiesel has been produced commercially for partial supporting energy demmand in Indonesia. However, high price feedstock and need of catalyst appear as the problem. In this research, activated sludge which is available as large scale waste and comprises significant ammount of lipid fraction (direct adsorption of industrial waste water and microbial lipid), was converted into biodiesel using subcritical process (without catalyst). The potential of the feedstock and process in producing biodiesel were studied. The optimum condition of the production is 215oC, 65 bar, and 5:1 of methanol to lipid mass ratio and the biodiesel meets the SNI-04-7182-2006 spesification. Keywords: biodiesel, green process, activated sludge
Modifikasi gugus aktif suatu karbon aktif dan karakterisasinya Wibowo, Nani; Setiawan, Jang; Ismadji, Suryadi
Jurnal Teknik Kimia Indonesia Vol 3, No 1 (2004)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2004.3.1.6

Abstract

The effect of addition of oxidizing acid on activated carbon surface chemistry is presented in this paper. The Activated carbon used in this study was made from coconut shell. In present study, sulfuric acid was used as the oxidizing acid. In treatment process, activated carbon was impregnated in sulfuric acid solution at various concentrations and temperature for 4 h. Subsequently, the surface chemistry of activated carbon was analyzed by Boehm titration method. From the experimental results it was found that acid functional group in activated carbon increase while the base functional group decreases. In order to know the effect of oxidizing acid on the pore structure of activated carbon, the XRD analyzed were carried out. It was found that oxidizing acid gave no effect on the pore structure of activated carbon studied. The gas phase benzen adsorption experiments were also carried out in order to find the effect of oxidizing acid on activated carbon adsorption capacity.Key Words: Activated Carbon, Base Functional Group, Acid Functional GroupAbstrakMakalah ini mempelajari tentang pengaruh penambahan asam oksidator terhadap sifat kimia permukaan suatu karbon aktif. Karbon aktif yang digunakan adalah karbon aktif yang terbuat dari tempurung kelapa. Pada percobaan ini, karbon aktif ditreatment dengan menggunakan oksidator asam sulfat. Proses treatment dilakukan dengan merendam karbon dalam asam sulfat pada konsentrasi dan temperatur tertentu selama empat jam. Setelah proses treatment, dianalisa sifat kimia permukaan karbon aktif dengan menggunakan metode Boehm untuk menganalisa gugus asam, dimana karbon direndam dengan larutan basa dan dititrasi balik dengan larutan asam. Sedangkan untuk analisa gugus basa, karbon direndam dengan larutan asam dan dititrasi balik dengan larutan basa. Dari hasil analisa diketahui bahwa penambahan oksidator asam sulfat memperbanyak jumlah gugus asam dan mengurangi jumlah gugus basa pada permukaan karbon aktif. Untuk mengetahui perubahan struktur pori karbon aktif, dilakukan analisa dengan menggunakan X Ray Diffraction (XRD). Dari kurva hasil analisa XRD, dapat dilihat bahwa penambahan oksidator asam sulfat tidak mempengaruhi bentuk dan ukuran pori dari karbon aktif. Analisa kemampuan penyerapan  karbon aktif dilakukan melalui adsorpsi benzen pada fase gas. Dari hasil percobaan diketahui bahwa penambahan oksidator asam sulfat mengurangi kemampuan penyerapan karbon aktif terhadap benzen.Kata Kunci: Karbon Aktif, Gugus Basa, Gugus Asam
Modification of the surface chemistry of activated carbon and its influence on methylene blue adsorption Wibowo, David; Setyadhi, Lanny; Ismadji, Suryadi
Jurnal Teknik Kimia Indonesia Vol 5, No 1 (2006)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2006.5.1.6

Abstract

The adsorption behavior of activated carbons is determined not only by their porous structures but also by the chemical nature of its surface. The surface chemistry of activated carbons can be selectively modified in order to improve their adsorption capacity. In this study, a NORIT granular activated carbon was treated by oxidant (HNO3) and non-oxidant acid (HCI) at different concentrations and temperatures. The surface chemistries of the materials were characterized by Boehm titration method and by the determination of the point of zero charge (pHPZC).The adsorption properties of the selected samples were studied by adsorption of methylene blue, which is one of the important dyes and found in many textile effluents. In addition, the pore structures of the modified carbons were also studied by argon adsorption at 87.29 K. As results, it was observed that both HN03 and HCI treatments could increase the surface acidity of activated carbons. Activated carbons modified by HCI gave the best performance on the adsorption of methylene blue.Keywords: Activated Carbon, Surface Chemistry, Chemical Treatment, Boehm Titration Method, Adsorption AbstrakKemampuan adsorpsi karbon akti.ftidak hanya ditentukan oleh struktur pori tetapijuga dipengaruhi oleh sifat kimia dari permukaannya. Sifat kimia permukaan karbon aktif dapat secara selektif dimodifikasi dengan tujuan untuk lebih meningkatkan kapasitas adsorpsinya. Pada penelitian ini, karbon aktif NORIT granular ditreatment dengan menggunakan asam oksidator (HNO) dan non-oksidator (HCI) pada berbagai konsentrasi dan suhu. Sifat kimia permukaan karbon aktif dikarakterisasi dengan menggunakan metode titrasi Boehm serta dengan penentuan point of zero charge (pHPZC). Kemampuan adsorpsinya diuji dengan mengadsorp larutan methylene blue, dimana methylene blue merupakan salah satu komponen dalam limbah tekstil. Sedangkan struktur pori karbon aktif dianalisa dengan adsorpsi Ar pada suhu 87,29 K. Penelitian ini menunjukkan bahwa baik treatment dengan HNO3 maupun HCI dapat mengakibatkan terjadinya peningkatan sifat asam pada permukaan karbon aktif. Karbon aktif yang diberi perlalatan dengan HCI memberikan kemampuan adsorpsi yang paling baik dalam adsorpsi larutan methylen biru.Kata Kunci: Karbon Aktif, Sifat Kimia Permukaan, Perlakuan dengan Larutan Kimia, Metode Titrasi Boehm, Adsorpsi
Adsorpsi zat organik nitrobenzene dari larutan dengan menggunakan bubuk daun intaran Wijaya, Yentaria Juli; Rinita, R; Soetaredjo, Felycia Edi; Ismadji, Suryadi
Jurnal Teknik Kimia Indonesia Vol 7, No 3 (2008)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2008.7.3.5

Abstract

Nitrobenzene is one of organic compound that usually contained in industrial wastewater, which is toxic. Nitrobenzene can be found in the chemical and pesticides industry. Nitrobenzene, which also known as nitrobenzol, is dangerous organic chemical for organism because can cause death. Organic waste in aqueous solution are usually removed by adsorption. In the adsorption process, adsorbent that usually used are carbon active and organic adsorbent. Neem leaf one of organic adsorbent that effective used in the adsorption process because it has a low cost dan easy to get. In this adsorption process, neem leaf used as a adsorbent. Neem leaf powder characterization with Boehm’s titration and proxymate analysis, which contain moisture content, water content, carbon, and volatile matter. Isoterm adsorption process of  nitrobenzene is appropriated with Freundlich equation and Langmuir equation. And the result of kinetic adsorption is appropriated with pseudo first order and pseudo second order. From the experimenal result, it can be seen that adsorption of nitrobenzene by neem leaf powder is using Langmuir equation in isoterm adsorption and follow pseudo first order in kinetic adsorption.Keywords : Adsorption, neem leaf powder, nitrobenzeneAbstrakNitrobenzene merupakan salah satu zat organik yang biasanya terkandung dalam limbah industri dimana Nitrobenzene sangat sulit diolah sebelum dibuang karena sifatnya yang sangat kompleks. Limbah yang mengandung nitrobenzene ini dapat ditemukan pada industri pestisida, sabun, dan farmasi. Nitrobenzene yang juga disebut nitrobenzol, merupakan bahan kimia organik yang berbahaya bagi mahluk hidup karena dapat menyebabkan kematian. Adsorpsi adalah salah satu cara yang dapat digunakan untuk mengatasi limbah nitrobenzene ini. Dalam proses adsorpsi, bahan penyerap yang umum digunakan adalah karbon aktif dan bahan penyerap organik. Daun intaran merupakan salah satu dari bahan penyerap organik yang efektif digunakan dalam proses adsorpsi karena biayanya yang murah dan mudah didapat. Pada penelitian ini, daun intaran digunakan untuk menyerap zat organik nitrobenzene. Karakterisasi bubuk daun intaran sendiri dilakukan dengan titrasi Boehm dan analisa proximat yang meliputi kandungan abu, air, karbon, dan volatile matter. Proses isoterm adsorpsi nitrobenzene ini disesuaikan dengan persamaan Freundlich dan persamaan Langmuir, sedangkan hasil kinetika adsorpsi disesuaikan dengan menggunakan pseudo first order dan pseudo second order. Dari hasil percobaan, didapatkan hasil bahwa proses adsorpsi nitrobenzene dengan menggunakan bubuk daun intaran ini mengikuti persamaan Langmuir pada isoterm adsorpsinya dan mengikuti persamaan pseudo first order pada kinetika adsorpsinya.Kata Kunci : Adsorpsi, bubuk daun intaran, nitrobenzene
Pseudoternary Phase Diagram and Antibacterial Activity of Microemulsion-Based Citronella Oil Gunarto, Chintya; Go, Alchris Woo; Angkawijaya, Artik Elisa; Lie, Jenni; Soetaredjo, Felycia Edi; Ismadji, Suryadi; Puspitasari, Nathania; Putro, Jindrayani Nyoo; Risdian, Chandra
Indonesian Journal of Chemistry Vol 24, No 3 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.93250

Abstract

Citronella oil (CTO) is extracted from citronella leaves by maceration or steam distillation process, which has antibacterial and insect-repellent activities. However, the use of CTO is limited and requires modification in other formulations, such as microemulsion (ME), to increase its bioactivities. ME consists of oil, water, surfactant and/or cosurfactant and is commonly applied in food and beverages, cosmetics, and carrier for drug delivery applications. CTO was used as the oil phase for ME with nonionic surfactant and ethanol as a cosurfactant for lowering interfacial tension between oil and water phase. Subsequent observations regarding stability and antibacterial tests were carried out on ME formulations with surfactant/cosurfactant mixture of 2 due to its largest ME area. A hydrodynamic diameter analysis was also carried out to see the stability of the ME within a period of 50 d. ME with 10% CTO, 30% surfactant mixture, and 60% water showed the best formulation observed from the consistent hydrodynamic diameter measurement. In addition, ME with different formulations could inhibit the growth of Escherichia coli and Staphylococcus aureus by more than 90%. From this research, CTO-based ME potentially improve and develop drug carrier applications, especially via topical route.
Optimum and Green Fabrication of MIL-100(Fe) for Crystal Violet Dye Removal from Aqueous Solution Wijaya, Christian Julius; Soetaredjo, Felycia Edi; Yuliana, Maria; Santoso, Shella Permatasari; Hartono, Sandy Budi; Irawaty, Wenny; Lie, Jenni; Putro, Jindrayani Nyoo; Gunarto, Chintya; Puspitasari, Nathania; Ismadji, Suryadi; Gunawan, Setiyo
Indonesian Journal of Chemistry Vol 24, No 5 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.93323

Abstract

MIL-100(Fe) was prepared and subsequently used to remove crystal violet dye from aqueous solutions simulating dye-containing wastewater in the environment. In the future, it is aimed that MIL-100(Fe) can be used in managing dye-containing wastewater in the environment and reducing the negative impacts it can cause. Here, MIL-100(Fe) fabrication needs to be optimized to obtain optimum process conditions, which are environmentally friendly and can produce MIL-100(Fe) with the best characteristics. This study focused on optimizing the fabrication of MIL-100(Fe), which is a type of MOF with good chemical stability, thermal stability, and flexible structure. In this study, the room-temperature fabrication of MIL-100(Fe) was established using a ligand-to-metal molar ratio of 0.95 and an acetic acid concentration of 5.1 vol% for 6.2 h. The optimum MIL-100(Fe) was tested for crystal violet removal and provided an optimum removal capacity of 182.66 ± 3.81 mg/g. Statistical approaches are used to investigate the independent parameters and their interactions contributing to MIL-100(Fe) formation.
Co-Authors Adriana Anteng Anggorowati Angkawijaya, Artik Elisa Aning Ayucitra Chandra Risdian Ernest, Edward Hartman Farrel Gunawan Felycia Edi Soetaredjo Go, Alchris Woo Gosal, Ferdy Gunarto, Chintya Hartono, Sandy Budi Iwan Gunawan Kurniawan, Darwin Laysandra, Livy Lie, Jenni Lourentius, Suratno Puspitasari, Nathania Putro, Jindrayani Nyoo Rinita, R Santoso, Shella Permatasari Sarah Yarden Palinggi Setiawan, Jang Setiyo Gunawan Setyadhi, Lanny Wenny Irawaty Wibowo, David Wibowo, Nani Widagdo, Antonius Jimmy Wijaya, Christian Julius Wijaya, Yentaria Juli Yuliana, Maria