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All Journal Jurnal Teknik Kimia Eksergi: Chemical Engineering Journal Jurnal Sumberdaya Alam dan Lingkungan The Journal of Pure and Applied Chemistry Research Jurnal Fisika Unand JURNAL INTEGRASI PROSES Jurnal Penelitian Pertanian Terapan Briliant: Jurnal Riset dan Konseptual Jurnal Pendidikan Kimia (JPKim) SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan G-Tech : Jurnal Teknologi Terapan Nusantara Science and Technology Proceedings AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment)
Dyah Suci Perwitasari
Program Studi Teknik Kimia, Fakultas Teknik, Universitas Pembangunan Nasional ”Veteran” Jawa Timur
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Synthesis and characterization of reduced graphene oxidation from corn cob waste Dyah Suci Perwitasari; Adinata Shafi Wahyudi Suwarno; Muhammad Nauli Rizqi Akbar
Jurnal Pendidikan Kimia (JPKIM) Vol 14, No 3 (2022): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (225.126 KB) | DOI: 10.24114/jpkim.v14i3.39348

Abstract

Graphene is the latest carbon-based nanomaterial with wide applications and has superiority in electrical, thermal, and high conductivity properties. This study aims to synthesize and characterize reduced graphene oxide (rGO) from corncob waste using the modified Hummer method. which was carried out by removing the NaNo3 material. This synthesis used corncob waste that was made into charcoal with a particle size of 100 mesh with an oxidation time of 5 days. Structural analysis of rGO used Fourier Transform Infa Red (FTIR) and X-ray diffraction (XRD) testing. The results of FTIR testing showed a wave peak at 1568.82 cm-1 with C=C bonds which indicated that rGO was formed. The XRD test results showed a diffractogram peak at an angle of 2θ ~ 24.6635 which is typical of rGO materials.Keywords: Corncob waste; Graphene; Graphite; Modified hummer; rGO
A Coupling Agent's Inclusion Affects Functional Groups and Heat Resistance in Energy Storage Materials Fauziyah, Nur Aini; Perwitasari, Dyah Suci; Wardhani, Primasari Cahya; Ernawati, Dira; Nabilla, Nabilla
The Journal of Pure and Applied Chemistry Research Vol. 12 No. 3 (2023): September-December 2023
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2023.012.03.3324

Abstract

The study of functional groups and heat resistance of energy-importing materials, as well as the inclusion of coupling agents, were the primary subjects of this article. 3-(trimethoxysilyl) propyl methacrylate was the coupling agent employed in this study to alter the surface of the silica in the composite material being created. Furthermore, the emergence of bifunctional organometallic (silane) connecting groups allowed the coupling agent to improve the energy storage material's heat resistance. Through the using of dynamic mechanical analysis, scanning electronic microscopy, and thermal tests. It was determined how the type of coupling material affected the interfacial bond strength. According to the findings, there was a significant interaction between the coupling material and the filler surface that had an impact on the material's heat resistance.
Sintesis dan Karakterisasi Al-MCM-41 dari Kaolin Bangka Belitung sebagai Sumber Silika dan Alumina Nurfauzi, Muchamad Lutfi; Susianto, Mordekhai Yosep; Perwitasari, Dyah Suci; Nugraha, Reva Edra; Aziz, Abdul; Jovita, Stella; Utami, Diana Inas; Damayanti, Nabilla
Jurnal Sumberdaya Alam dan Lingkungan Vol 11, No 2 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jsal.2024.011.02.5

Abstract

ABSTRAK Al-MCM-41 adalah material padatan berpori yang tersusun dari silika amorf, memiliki struktur membentuk susunan heksagonal dengan ukuran pori antara 2-50 nm, sehingga dikategorikan sebagai material mesopori. Dalam pembuatan Al-MCM-41 membutuhkan sumber silika dan alumina yang tinggi sebagai bahan pembuatannya, sehingga dibutuhkan bahan yang kaya akan kedua senyawa tersebut sebagai bahan alternatif dalam pembuatan Al-MCM-41. Rumus formula kaolin adalah Al4(Si4O10)(OH)8 dengan komponen mineral utamanya  adalah SiO2  dan Al2O3 Kaolin yang digunakan berasal dari bangka belitung dengan kandungan SiO2 sebesar 61% dan Al2O3 sebesar 31%, kandungan SiO2 dan Al2O3 yang cukup tinggi dimanfaatkan sebagai bahan pada sintesis material aluminosilikat seperti Al-MCM-41. Sintesis Al-MCM-41 dari kaolin dilakukan dengan metode hidrotermal. pH yang digunakan sebesar 10, dengan suhu 80°C selama 12 jam pada proses hidrotermalnya. Al-MCM-41 hasil sintesis dianalisa menggunakan XRD dan FTIR dimana pada analisa XRD sudut pendek menunjukkan 3 puncak pada 2θ= 2.237°, 3.921°, 4.449° dan XRD sudut panjang pada 2θ= 21.449°. Analisa FTIR untuk Al-MCM-41 menunjukkan pita serapan pada bilangan gelombang 436.49; 802.47; 1146.41; 1630.61; 3389.79 cm-1. Kata kunci: Al-MCM-41, hidrotermal, lempung, mesopori, pH ABSTRACT  Al-MCM-41 is a porous solid material composed of amorphous silica, has a structure forming a hexagonal array with a pore size between 2-50 nm, so it is categorized as a mesoporous material. The manufacture of Al-MCM-41 requires a high source of silica and alumina as materials, so materials rich in both compounds are needed as the development of materials used in the manufacture of Al-MCM-41. Kaolin (Al4(Si4O10)(OH)8) is a white clay mineral, the main minerals are SiO2 and Al2O3. The kaolin used comes from bangka belitung with a SiO2 content of 61% and Al2O3 of 31%, the high content of SiO2 and Al2O3 is utilized as an ingredient in the synthesis of aluminosilicate materials such as Al-MCM-41. The synthesis of Al-MCM-41 from kaolin was carried out by hydrothermal method. The pH used was 10, with a temperature of 80°C for 12 hours in the hydrothermal process. The synthesized Al-MCM-41 was analyzed using XRD and FTIR where the short angle XRD analysis showed 3 peaks at 2θ = 2.237°, 3.921°, 4.449° and long angle XRD at 2θ = 21.449°. FTIR analysis for Al-MCM-41 showed absorption bands at wave numbers 436.49; 802.47; 1146.41; 1630.61; 3389.79 cm-1. Keywords: Al-MCM-41, clay, hydrothermal, kaolin, mesopore, pH 
Studi Kinetika Adsorpsi Limbah Zat Warna Metilen Biru Menggunakan Grafen Oksida dari Karbon Limbah Baterai Fadhila, Dheytra Akhnaz Namira; Nugroho, Sutra Amelia; Perwitasari, Dyah Suci; Nugraha, Reva Edra; Aziz, Abdul; Jovita, Stella; Utami, Diana Inas; Damayanti, Nabilla
Jurnal Sumberdaya Alam dan Lingkungan Vol 11, No 2 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jsal.2024.011.02.4

Abstract

ABSTRAK Perkembangan industri tekstil menjadi salah satu penyumbang terbesar limbah zat warna ke lingkungan yang berdampak pencemaran terhadap sumber air. Hal ini dikarenakan melalui hasil pengamatan langsung di lapangan kondisi air limbah yang dibuang masih berwarna pekat dan berbau. Penelitian ini bertujuan untuk mempelajari kinetika adsorpsi zat warna metilen biru menggunakan adsorben grafen oksida yang disintesis dari limbah baterai. Metode hummer digunakan dalam sintesis grafen oksida melalui penambahan asam sulfat. Studi kinetika adsorpsi dilakukan pada konsentrasi metilen biru 10-50 ppm serta variasi waktu adsorpsi 5-25 menit. Kondisi optimum diperoleh pada pada konsentrasi metilen biru 30 ppm dengan waktu 25 menit. Mekanisme adsorpsi yang terjadi mengikuti model Langmuir nilai R2 sebesar 0.92522 dengan nilai Qm= 99.1 mg.g-1 dan nilai K=0.325. Kata kunci: adsorpsi, graphene oxide, jurnal, teknik lingkungan ABSTRACT  The development of the textile industry is one of the main sources of dye waste I the environment, which means that the discharged wastewater is still concentrated and smelly when observed directly on the ground, thus contributing to water pollution. The aim of this study is to determine the relationship between the concentration of methylene blue dye and the adsorption time and to determine the adsorption isotherm. For the synhesis of graphene oxide, the hummer’s method was used where graphite wes recombined with H2SO4 sulfuric acid and the adsorbed solution was measured using UV-Vis spectrophotometer. Graphene oxide acted as an adsorbent by adsorbing methylene blue and the result showed that he optimum time and concetration was acheieved at a 30 ppm and 25 minutes.  The adsorption mechanism aligns with the Langmuir model, demonstrated by an R2 value of 0.92522, a Qm value of 99.1 mg.g-1, and a K value of 0.325. Keywords: adsorption, environmental engineering, graphene oxide, journal  
KAJIAN PENAMBAHAN ION KALSIUM PADA KRISTALISASI STRUVITE DARI URINE MANUSIA Perwitasari, Dyah Suci; Saputro, Erwan Adi; Rizquallah, Izal Daffa; Akbar, Dimas Ilham
Jurnal Teknik Kimia Vol 18, No 1 (2023): Jurnal Teknik Kimia
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v18i1.4123

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh penambahan ion kalsium pada pembentukan Kristal struvite yang dapat digunakan sebagai pupuk dengan pengaruh suhu dan perbandingan molar Struvite adalah kristal putih secara kimia dikenal sebagai magnesium amonium phosphat hexahydrate (MgNH4PO4.6H2O). Pupuk struvite dari limbah urine mempunyai keunggulan dari segi ekonomi, karena biaya produksi pupuk struvite ini jauh lebih murah dan mudah dibandingkan dengan pembuatan pupuk lainnya, bahkan pertumbuhan, biomassa, dan kandungan klorida tanaman sedikit lebih tinggi jika menggunakan pupuk urine. Pembuatan struvite ini menggunakan magnetic strirrer dengan perbandingan molar Mg:PO4:Ca dan suhu sebesar 30°C, 35°C, dan 40°C. Hasil terbaik dari penelitian ini yaitu dengan perbandingan molar Mg:PO4:Ca 1:1:0 pada suhu 40°C dengan kadar P2O5 sebesar 46,2%.  DOI : https://doi.org/10.33005/jurnal_tekkim.v18i1.4123
Utilization of Corn Husk Waste as Raw Material for Making Biobutanol Dyah Suci Perwitasari; Graciella Yerrica Nathania; Abid Alghifari
Nusantara Science and Technology Proceedings 4th International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2023.3639

Abstract

Corn husk waste is a biomass raw material that can be processed into biobutanol. Making biobutanol to reduce the use of fossil fuels. This research used anaerobic microorganisms, namely Clostridium acetobutylicum, which can survive at low pH between 4,5 and 5 at a temperature of 30°C. Corn husk contains 36.218% cellulose; 25.212% hemicellulose; 15.807% lignin. The cellulose raw material content can be used for fermentation because it meets the fermentation content requirements of 36 – 50%. The research methods used include raw material preparation, delignification, dilute acid hydrolysis, and anaerobic fermentation. The research results showed that optimum condition was obtained at the 72-hour fermentation time with the addition of a 5% Clostridium acetobutylicum bacteria volume of 7.0160%. At the 72 hour fermentation time, it showed that the bacteria grew optimally and entered the stationary phase. Biobutanol levels after 72-hour decreased due to reduced nutrients in the fermentation media. The increase in the volume of bacteria affects the final results, the volume of bacteria is added, the final results biobutanol levels will decrease because the nutrients added have been used up. The results of the analysis of butanol levels were determined using Gas Chromatography, the standard for butanol formation obtained at a retention time of 3.598%. The low butanol content (7,0160%) does not require industry standards (96.5 – 99%) to be used as environmentally friendly fuel, due to obstacles in maintaining anaerobic fermentation conditions and not carrying out fermentation filtrate sterilization, which has an impact on the final result of biobutanol content.ly and requires improvement, particularly in the quest for zero defects.
Pembuatan Pupuk Granul Dari Limbah Gypsum dan Urea Pamoedji, Yemima Natalia Eka Kristiyanti; Widyaningrum, Nilam Putri; Muljani, Srie; Perwitasari, Dyah Suci; Sumada, Ketut
Jurnal Teknik Kimia Vol 19, No 1 (2024): Jurnal Teknik Kimia (JUTEKK) Vol.19, No.1, 2024
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v19i1.4826

Abstract

Gipsum adalah salah satu dari sejumlah mineral yang mengendap. Mineral-mineral lain yang termasuk dalam kelompok ini meliputi karbonat, borat, nitrat, dan sulfat. Jenis gipsum yang paling umum dijumpai adalah varietas hidrat kalsium sulfat dengan rumus kimia CaSO4.2H2O. Kandungan Ca pada gipsum dimanfaatkan sebagai campuran pupuk organik yang dapat membantu perkembangan akar, bunga, dan buah pada tanaman. Salah satu pengolahan padatan gypsum menjadi pupuk granul dengan penambahan urea sebagai penambah unsur nitrogen. Penelitian ini bertujuan untuk mencari kadar nitrogen yang sesuai dengan SNI (Standar Nasional Indonesia) didalam pupuk granul. Metode yang digunakan adalah pencampuran padatan gypsum yang telah kering sebanyak 5000 gram dengan penambahan urea 1000 gram; 1250 gram; dan 2500 gram, dan di granulasi selama 30 menit; 60 menit; dan 90 menit. Produk disaring sesuai dengan ukuran, kemudian di analisa kadar nitrogennya. Berdasarkan hasil penelitian, diperoleh kadar nitrogen tertinggi pada proses granulasi dengan penambahan urea 1250 gram dengan waktu 60 menit yaitu sebesar 2,65%.
Penelitian Pupuk Biofertilizer Berbahan dasar Kulit Buah Nanas dan Abu Rumput Gajah dengan pengaruh Berat bahan dan Durasi fermentasi Dian Pratiwi Tejo Kusumo; Dimas Arnanda; Kindriari Nurma Wahyusi; Dyah Suci Perwitasari; Retno Dewati
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.6013

Abstract

This research develops a biofertilizer production method using pineapple peel waste and elephant grass ash as raw materials. Pineapple peel contains nutrients that can improve soil fertility, while elephant grass, commonly used as livestock feed, has high silica content beneficial to the soil when used as fertilizer. The research aimed to produce a biofertilizer and examine the effects of material weight and fermentation duration on the levels of Nitrogen (N), Phosphorus (P), and Potassium (K), assessing whether the results meet Indonesian National Standard (SNI) fertilizer requirements. The fermentation process lasted approximately 35 days. The fermented biofertilizer was analyzed using the Micro Kjeldahl method for Nitrogen, UV-Vis Spectrophotometry for Phosphorus, and Atomic Absorption Spectrophotometry (AAS) for Potassium. The results showed the highest concentrations of Nitrogen (2.98%), Phosphorus (2.43%), and Potassium (3.39%) were obtained using 40 grams of elephant grass ash and 35 days of fermentation. The analysis indicated that increasing the amount of elephant grass ash and the fermentation duration resulted in higher N, P, and K levels. These findings align with SNI fertilizer standards, highlighting the potential of using sustainable and easily accessible materials to enhance organic fertilizer production efficiency.
PENGARUH DEBIT DAN RECYCLE MIKROBA AEROB PADA PENGOLAHAN LIMBAH KERUPUK UDANG DENGAN KONTAK-STABILISASI Setiani, Astri; Safira, Lutfia Rima; Sumada, Ketut; Susilowati, Titi; Perwitasari, Dyah Suci
Jurnal Teknik Kimia Vol 19, No 2 (2025)
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v19i2.5075

Abstract

Industri kerupuk udang merupakan sektor yang memiliki potensi untuk menghasilkan limbah dan mengakibatkan pencemaran lingkungan terutama lingkungan perairan disekitar industri. Limbah kerupuk udang memiliki kadar COD dan BOD yang tinggi, jika limbah tersebut dibuang ke lingkungan tanpa adanya pengolahan, maka akan menimbulkan banyak masalah bagi lingkungan seperti terganggunya ekosistem sungai sekitar. Penelitian ini bertujuan untuk mengurangi kadar COD, BOD, dan menetralkan pH serta mengetahui pengaruh debit limbah masuk dan debit recycle mikroba aerob pada pengolahan limbah industri kerupuk udang menggunakan teknologi kontak-stabilisasi. Proses pengolahan dilakukan menggunakan dua kondisi operasi yang divariasikan yaitu debit limbah masuk sebesar 8liter/jam ; 10liter/jam ; 12liter/jam ; 16liter/jam ; 24liter/jam dan debit recycle mikroba yang divariasi sebesar 4liter/jam ; 5liter/jam ; 6liter/jam ; 8 liter/jam ; 12 liter/jam. Penurunan kadar COD dan BOD paling optimum pada debit limbah masuk 8 liter/jam dan debit recycle mikroba 12liter/jam dengan penurunan kadar COD sebesar 94.10% dan penurunan BOD sebesar 95.48%. Hal ini menunjukkan bahwa semakin kecil debit limbah masuk, maka penurunan kadar COD dan BOD semakin besar. Sementara itu, semakin besar debit recycle mikroba aerob maka penurunan kadar COD dan BOD semakin besar.
ENHANCING THE QUALITY OF BIO OIL FROM RICE STRAW WITH A COMBINATION OF CO-PYROLYSIS WITH PLASTIC AND CO-CATALYST Fe/Al2O3 Sirait, Esterly Septiana; Anwar, Rangga Febry; Perwitasari, Dyah Suci; Puspitawati, Ika Nawang
JURNAL INTEGRASI PROSES Vol 14, No 1 (2025)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jip.v14i1.32019

Abstract

This study investigates the enhancement of bio-oil quality derived from rice straw through co-pyrolysis with plastic waste (polypropylene and low-density polyethylene) and utilizing a Fe/Al₂O₃ co-catalyst. The pyrolysis process was conducted at 500°C for 20 minutes, with variations in plastic ratios and catalyst concentrations (0–20%). The results indicated that both the yield and calorific value of the bio-oil significantly increased with higher LDPE content and catalyst addition, achieving an optimum yield of 30.56% and a calorific value of 41.308 MJ/kg at a 0:50 PP:LDPE ratio with 20% catalyst. Viscosity and density values were also optimized, falling within ASTM standards with 2.511 cSt and 0.856 g/cm3. Gas chromatography-mass spectrometry (GC-MS) analysis confirmed the dominant presence of gasoline-range hydrocarbons and the absence of corrosive acetic acid. In contrast, ultimate analysis showed high carbon and hydrogen content, suggesting improved fuel quality. These findings indicate that combining co-pyrolysis with the Fe/Al₂O₃ catalyst and integrating plastic waste offers a promising method for producing high-quality, renewable bio-oil from rice straw.
Co-Authors Abdul Aziz Abid Alghifari Adinata Shafi Wahyudi Suwarno Aisah Akbar, Dimas Ilham Anwar, Rangga Febry AR Yelvia Sunarti Aurellia, Pingky Marcella Bambang Wahyudi Damayanti, Nabilla Dian Pratiwi Tejo Kusumo Dimas Arnanda Dira Ernawati Dyah Siswanti Fadhila, Dheytra Akhnaz Namira Fadly, Teuku Andi Graciella Yerrica Nathania Ika Nawang Puspitawati Jovita, Stella Ketut Sumada Kindriari Nurma Wahyusi Kindriari Nurma Wahyusi Kusuma Wardhani Mas’udah Luluk Edahwati Mas’udah, Kusuma Wardhani Maulida, Nabilah Muhammad Aji Pangestu Muhammad Aji Pangestu Muhammad Nauli Rizqi Akbar Nabilla Nabilla Nailul Hasan Nana Dyah Siswati, Anwar Zain and Mohammad Nufus, Wahyu Qur'ani Nufus, Wahyu Qurani Nugroho, Sutra Amelia Nur Aini Fauziyah Nuraini, Adila Silmi Nurfauzi, Muchamad Lutfi Pamoedji, Yemima Natalia Eka Kristiyanti Pangestu, Muhammad Aji Panjaitan, Renova Pardi Sampe Tola Pardi Sampe Tola Pracesa, Yahya Ardian Yuma Retno Dewati Reva Edra Nugraha Rizquallah, Izal Daffa Safira, Lutfia Rima Salsabil Husodo, Amani Sani Saputri, Resy Mareta Dwi Saputro, Erwan Adi Sari, Vini Fita Satrio, Wahyu Sugeng Bagus Setiani, Astri Sintha Soraya Santi Sirait, Esterly Septiana Sri Redjeki SRIE MULJANI Suprianti, Lilik Susianto, Mordekhai Yosep Susilowati Susilowati Teuku Andi Fadly Trianna, Nurul Widji Utami, Diana Inas Widyaningrum, Nilam Putri Yahya A. Yahya Ardian Yuma Pracesa