Article Per Year (5 Year)
p-Index From 2020 - 2025
1.723
P-Index
This Author published in this journals
All Journal Jurnal Rekayasa Proses Seminar Nasional Teknik Kimia Kejuangan Communications in Science and Technology Jurnal Rekayasa Proses Jurnal Ecoment Global: Kajian Bisnis dan Manajemen DEVOTE: Jurnal Pengabdian Masyarakat Global Prosiding Seminar Hasil Penelitian dan Pengabdian Kepada Masyarakat Jurnal Rekayasa Proses
Yuni Kusumastuti, Yuni
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Economics, Econometrics & Finance Education Engineering Environmental Science Mechanical Engineering Social Sciences Other

Published : 11 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 11 Documents
Search

 1   2 
Penentuan kondisi optimum pembuatan silica gel menggunakan silika geothermal dengan metode sol-gel Sujoto, Vincent Sutresno Hadi; Tangkas, I Wayan Christ Widhi Herman; Astuti, Widi; Sumardi, Slamet; Jenie, Siti Nurul Aisyiyah; Tampubolon, Aron Pangihutan Christian; Syamsumin, Syamsumin; Utama, Andhika Putera; Petrus, Himawan Tri Bayu Murti; Kusumastuti, Yuni
Jurnal Rekayasa Proses Vol 17, No 2 (2023)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.77696

Abstract

Salah satu permasalahan yang muncul di lapangan pembangkit listrik panas bumi (PLTP) adalah terjadinya silica scaling dalam sistem pemipaaan akibat konsentrasi padatan terlarut yang tinggi pada air geotermal (geothermal brine). Silica scalling dapat menyebabkan penurunan efisiensi pembangkitan energi listrik dari panas bumi. Pada penelitian ini lumpur silika yang dihasilkan dari lapangan pembangkit listrik panas bumi akan dimanfaatkan sebagai raw material sintesis silica gel. Silica gel disintesis menggunakan metode sol-gel dengan variasi rasio natrium silikat dan air (1:3 ; 1:4 ; dan 1:5) dan konsentrasi asam klorida ( 0,5 M ; 1 M; dan 2 M). Karakteristik silica gel dilihat menggunakan analisis Forier Transform Infra Red (FTIR). Secara umum, pita serapan yang muncul pada spektra sample silica gel menunjukkan bahwa gugus fungsional yang terdapat pada silica gel adalah gugus silanol (Si-OH) dan gugus siloksan (Si-O-Si). Panjang gelombang 1055,86 cm-1­ menunjukkan gugus Si-O, yang mengindikasikan adanya vibrasi SiO4 dan polimerisasi Si-O-Si saat pembentukan silica gel. Selain itu, kapasitas penjerapan air oleh silika gel menunjukkan bahwa sampel dengan kode A7 memiliki kapasitas penjerapan air terbesar, yaitu mencapai 0,9331 gr air/ gram silica gel. Analisis Response Surface Methodology (RSM) mengindikasikan bahwa konsentrasi asam memberikan pengaruh singnifikan terhadap pembentukan silica gel dibandingkan dengan variasi pengenceran natrium silikat.
Sintesis Copper-Nanoparticles dari Limbah Leaching Kalkopirit Sebagai Zat Antibakteri dengan Metode Reduksi Wibowo, Decka Pynka; Kusumastuti, Yuni; Prasetya, Agus; Asih, Yekti; Petrus, Himawan T.B.M; Idrus, Arifudin
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Nanoparticle technology has been widely used in various industries because of its advantages in particle size control systems. One example of the use of nanoparticle technology is copper nanoparticles as an antibacterial material. This research focuses on the utilization of leaching waste as a material for the synthesis of copper nanoparticles. The synthesis of copper nanoparticles was carried out by chemical reduction method between chalcopyrite stone leaching waste namely CuSO4 as precursor, Cetyl Trimethyl Ammonium Bromide (CTAB) as surfactant and NaBH4 reducing agent. The synthesized material will be analyzed using UV-Vis spectroscopy. Furthermore, the particle size will be estimated using PSA and its antibacterial properties will be analyzed using the well diffusion method by looking at the effectiveness of the inhibitory power against Escherichia coli FNCC 0049 and Staphylococcus bacteria aureus FNCC 0047. The results of the synthesis obtained the smallest size of 235.7 nm from the ratio of precursor concentration, reducing agent concentration and, a surfactant concentration of 1:20:8. The results of the synthesis of copper nanoparticles with concentrations of 10.000 ppm showed the presence of inhibitory power to overcome Escherichia coli FNCC 0049 and Staphylococcus bacteria aureus FNCC 0047.
Studi Recovery Tembaga pada Proses Froth Flotation dari Bijih Tembaga Papua, Indonesia dengan Variasi pH dan Konsentrasi Kolektor Heimbach, Ivano; Petrus, Himawan Tri Bayu Murti; Prasetya, Agus; Idrus, Arifudin; Timotius, Daniel; Kusumastuti, Yuni; Sutijan, Sutijan
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In the process of flotation of copper-bearing ore, several factors such as the concentration of the collector used and the pH of the fluid used can have an impact. In this study, observations were made on the influence of collector concentration and pH on the recovery of copper ores from Papua, Indonesia. The ore samples were obtained from three different site. Preparation of samples were conducted by crushing and sieving to obtain solid particles with a size of +200 mesh. The fine particles then fed into froth flotation device. Froth flotation operations were carried out at different operating condition namely pH (pH 3, pH 6, and pH 9), xanthate concentration (1300, 2000, and 2600 ppm), and time (3, 5, 7, and 14 minutes). The froth and tailings were collected separately and dried in an oven at 60oC. The feed, froth, and tailings were then subjected to EDX analysis to determine their compositions. The results of the experiment showed that higher collector concentrations did not necessarily lead to increased copper recovery. The appropriate pH conditions, however, could optimize copper recovery. The optimum conditions obtained from this experiment were xanthate concentration of 2000 ppm, pH of 3, and the ore sample 2
Penentuan kondisi optimum pembuatan silica gel menggunakan silika geothermal dengan metode sol-gel Sujoto, Vincent Sutresno Hadi; Tangkas, I Wayan Christ Widhi Herman; Astuti, Widi; Sumardi, Slamet; Jenie, Siti Nurul Aisyiyah; Tampubolon, Aron Pangihutan Christian; Syamsumin, Syamsumin; Utama, Andhika Putera; Petrus, Himawan Tri Bayu Murti; Kusumastuti, Yuni
Jurnal Rekayasa Proses Vol 17, No 2 (2023)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.77696

Abstract

Salah satu permasalahan yang muncul di lapangan pembangkit listrik panas bumi (PLTP) adalah terjadinya silica scaling dalam sistem pemipaaan akibat konsentrasi padatan terlarut yang tinggi pada air geotermal (geothermal brine). Silica scalling dapat menyebabkan penurunan efisiensi pembangkitan energi listrik dari panas bumi. Pada penelitian ini lumpur silika yang dihasilkan dari lapangan pembangkit listrik panas bumi akan dimanfaatkan sebagai raw material sintesis silica gel. Silica gel disintesis menggunakan metode sol-gel dengan variasi rasio natrium silikat dan air (1:3 ; 1:4 ; dan 1:5) dan konsentrasi asam klorida ( 0,5 M ; 1 M; dan 2 M). Karakteristik silica gel dilihat menggunakan analisis Forier Transform Infra Red (FTIR). Secara umum, pita serapan yang muncul pada spektra sample silica gel menunjukkan bahwa gugus fungsional yang terdapat pada silica gel adalah gugus silanol (Si-OH) dan gugus siloksan (Si-O-Si). Panjang gelombang 1055,86 cm-1­ menunjukkan gugus Si-O, yang mengindikasikan adanya vibrasi SiO4 dan polimerisasi Si-O-Si saat pembentukan silica gel. Selain itu, kapasitas penjerapan air oleh silika gel menunjukkan bahwa sampel dengan kode A7 memiliki kapasitas penjerapan air terbesar, yaitu mencapai 0,9331 gr air/ gram silica gel. Analisis Response Surface Methodology (RSM) mengindikasikan bahwa konsentrasi asam memberikan pengaruh singnifikan terhadap pembentukan silica gel dibandingkan dengan variasi pengenceran natrium silikat.
SOSIALISASI PROGRAM KABUPATEN/KOTA SEHAT DI FORUM KOTA SEHAT TEGALLAYANG, CATURHARJO, KAPANEWON PANDAK, BANTUL Kasjono, Heru Subaris; Rubaya, Agus Kharmayana; Kusumastuti, Yuni; Yamtana, Yamtana; Sintawati, Ratna Etika
Devote: Jurnal Pengabdian Masyarakat Global Vol. 3 No. 4 (2024): Devote : Jurnal Pengabdian Masyarakat Global, Desember 2024
Publisher : LPPM Institut Pendidikan Nusantara Global

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/devote.v3i4.3369

Abstract

Tegallayang, Caturharjo, Kapanewon Pandak, Bantul Regency, Special Region of Yogyakarta, is one of the designated locations for the Healthy District or City (Kabupaten atau Kota Sehat, KKS) assessment in Bantul in 2025. To achieve the objectives of this program, the local government must establish a forum focused on empowering community cadres. However, not all regions have effectively implemented the Healthy District or City program. Challenges include the lack of outreach and socialization by the government, resulting in limited public awareness of the program, as well as inadequate cross-sectoral collaboration. This community engagement activity aims to enhance knowledge about the Healthy District or City initiative and provide guidance for creating residential areas that meet health indicators. The methods employed include delivering material using PowerPoint presentations and LCD projectors, targeting the Healthy District or City forum groups in Kapanewon Pandak, Bantul
Penentuan kondisi optimum pembuatan silica gel menggunakan silika geothermal dengan metode sol-gel Sujoto, Vincent Sutresno Hadi; Tangkas, I Wayan Christ Widhi Herman; Astuti, Widi; Sumardi, Slamet; Jenie, Siti Nurul Aisyiyah; Tampubolon, Aron Pangihutan Christian; Syamsumin, Syamsumin; Utama, Andhika Putera; Petrus, Himawan Tri Bayu Murti; Kusumastuti, Yuni
Jurnal Rekayasa Proses Vol 17 No 2 (2023): Volume 17, Number 2, 2023
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.77696

Abstract

Salah satu permasalahan yang muncul di lapangan pembangkit listrik panas bumi (PLTP) adalah terjadinya silica scaling dalam sistem pemipaaan akibat konsentrasi padatan terlarut yang tinggi pada air geotermal (geothermal brine). Silica scalling dapat menyebabkan penurunan efisiensi pembangkitan energi listrik dari panas bumi. Pada penelitian ini lumpur silika yang dihasilkan dari lapangan pembangkit listrik panas bumi akan dimanfaatkan sebagai raw material sintesis silica gel. Silica gel disintesis menggunakan metode sol-gel dengan variasi rasio natrium silikat dan air (1:3 ; 1:4 ; dan 1:5) dan konsentrasi asam klorida ( 0,5 M ; 1 M; dan 2 M). Karakteristik silica gel dilihat menggunakan analisis Forier Transform Infra Red (FTIR). Secara umum, pita serapan yang muncul pada spektra sample silica gel menunjukkan bahwa gugus fungsional yang terdapat pada silica gel adalah gugus silanol (Si-OH) dan gugus siloksan (Si-O-Si). Panjang gelombang 1055,86 cm-1­ menunjukkan gugus Si-O, yang mengindikasikan adanya vibrasi SiO4 dan polimerisasi Si-O-Si saat pembentukan silica gel. Selain itu, kapasitas penjerapan air oleh silika gel menunjukkan bahwa sampel dengan kode A7 memiliki kapasitas penjerapan air terbesar, yaitu mencapai 0,9331 gr air/ gram silica gel. Analisis Response Surface Methodology (RSM) mengindikasikan bahwa konsentrasi asam memberikan pengaruh singnifikan terhadap pembentukan silica gel dibandingkan dengan variasi pengenceran natrium silikat.
THE EFFECT OF EDUCATIONAL TRAINING, ORGANIZATIONAL SUPPORT, EMOTIONAL INTELLIGENCE AND WORK FACILITIES ON EMPLOYEE PERFORMANCE Prabowo, Adelia Maritza Prabowo; Kusumastuti, Yuni
Jurnal Ecoment Global Vol. 10 No. 1 (2025): Edisi April 2025
Publisher : Universitas Indo Global Mandiri Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36982/jeg.v10i1.5249

Abstract

Abstract Objective: This study aims to determine the effect of Education Training, Organizational Support, Emotional Intelligence and Work Facilities on Employee Performance at the Meteorology, Climatology and Geophysics Agency Region II. Design/Methods/Approach: The research method used is quantitative descriptive. The data analysis technique employed in this study is multiple linear regression. The sampling method used in this research is saturation sampling, with a total sample size of 80 employees. Data were collected through a questionnaire using a Likert scale, which was processed using Microsoft Excel 19 and Statistics Product Service and Solution (SPSS) version 26 software. Findings: The results of this study indicate that the variables of Education Training and Emotional Intelligence have a positive and significant effect on Employee Performance, while the variables of Organizational Support and Work Facilities have a positive and insignificant effect on Employee Performance. Originality/Value: The novelty of this study lies in the results that are different from previous studies, thus proving that the results of the research presented by previous researchers are inconsistent. Practical/Policy implication: The results of this study are expected to contribute to the development of human resource management strategies at BBMKG Region II Tangerang Selatan. Keywords: Education Training, Organizational Support, Emotional Intelligence, Work Facilities, Employee Performance
Kinetic study of bioactive compound extraction from cacao shell waste by conventional and deep eutectic solvent Irsal, Muh.; Kusumastuti, Yuni; Ariyanto, Teguh; Putri, Nur Rofiqoh Eviana
Communications in Science and Technology Vol 10 No 1 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.1.2025.1606

Abstract

Cacao shells contain bioactive compounds such as phenolic acids and flavonoids. This study investigated the potential of bioactive compound extraction in cacao shells using conventional and green solvents like deep eutectic solvent (DES) (choline chloride: lactic acid). Specifically, it investigated the extraction kinetic models and parameters, which are critical to scale up the extraction process. The extraction of cacao shell was conducted using various conventional solvents (ethanol, methanol, n-hexane, and water) and DES (100 % and 70%) in which the result showed that DES 100% had the highest total phenolic content of 337.92?±?9.55 mg GAE/g dry weight. Meanwhile, pseudo-second order and Peleg’s model provided the best fit for the experimental data with higher R2 values. DES 70% showed a higher total flavonoid content of 76.51?±?1.59 mg RE/g dry weight. FT-IR and Raman spectroscopy confirmed the presence of bioactive compounds in DES-based extracts, which revealed characteristic vibrational bands associated with polyphenolic structures. These include bands corresponding to hydroxyl (–OH), carbonyl (C=O), and aromatic C=C stretching—functional groups commonly found in quercetin and other bioactive compounds.
Isolasi Selulosa dari Tandan Kosong Kelapa Sawit Menggunakan Deep Eutectic Solvent (DES) Berbasis Kolin Klorida dan Asam Laktat Rahmi, Hertantri Yulia; Kusumastuti, Yuni; Hidayat, Muslikhin
Sehati Abdimas Vol 7 No 1 (2024): Prosiding Sehati Abdimas 2024
Publisher : PPPM POLTESA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47767/sehati_abdimas.v7i1.912

Abstract

Tandan kosong kelapa sawit (TKKS) merupakan limbah padat yang dihasilkan dari proses pengolahan minyak kelapa sawit. Berdasarkan penelitian Sudiyani et al. (2013), TKKS mengandung lignoselulosa dengan komposisi tinggi, yakni 37,26% selulosa, 14,62% hemiselulosa, 31,68% lignin, 6,69% abu dan 1,34% zat ekstraktif. Kandungan selulosa pada TKKS memiliki potensi untuk dimanfaatkan menjadi produk bernilai ekonomis, namun perlu dilakukan treatment untuk mengisolasi selulosa dari senyawa lainnya. Salah satu metode yang digunakan untuk isolasi selulosa adalah ekstraksi padat-cair atau delignifikasi menggunakan pelarut ramah lingkungan yaitu deep eutectic solvent (DES). Dalam penelitian ini, DES dibuat dengan mencampurkan Hydrogen Bond Acceptor (HBA) berupa kolin klorida dan Hydrogen Bond Donor (HBD) berupa asam laktat. Variabel penelitian meliputi rasio molar HBA:HBD yang bervariasi, yaitu 1:1, 1:5, dan 1:10 serta suhu ekstraksi 70, 90, dan 110oC. Hasil ekstraksi dianalisis menggunakan metode Chesson untuk menentukan variasi terbaik berdasarkan persentase selulosa dan lignin. Hasil penelitian menunjukkan bahwa kondisi operasi dengan rasio molar HBA:HBD 1:10 pada suhu 110oC mampu menghasilkan selulosa tertinggi dan lignin terendah, masing-masing sebesar 59,45% dan 6,64%. Berdasarkan hasil ini, ekstraksi menggunakan deep eutectic solvent berbasis kolin klorida-asam laktat berpotensi digunakan sebagai salah satu metode ramah lingkungan dalam isolasi selulosa TKKS.
Studi Recovery Tembaga pada Proses Froth Flotation dari Bijih Tembaga Papua, Indonesia dengan Variasi pH dan Konsentrasi Kolektor Heimbach, Ivano; Petrus, Himawan Tri Bayu Murti; Prasetya, Agus; Idrus, Arifudin; Timotius, Daniel; Kusumastuti, Yuni; Sutijan, Sutijan
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In the process of flotation of copper-bearing ore, several factors such as the concentration of the collector used and the pH of the fluid used can have an impact. In this study, observations were made on the influence of collector concentration and pH on the recovery of copper ores from Papua, Indonesia. The ore samples were obtained from three different site. Preparation of samples were conducted by crushing and sieving to obtain solid particles with a size of +200 mesh. The fine particles then fed into froth flotation device. Froth flotation operations were carried out at different operating condition namely pH (pH 3, pH 6, and pH 9), xanthate concentration (1300, 2000, and 2600 ppm), and time (3, 5, 7, and 14 minutes). The froth and tailings were collected separately and dried in an oven at 60oC. The feed, froth, and tailings were then subjected to EDX analysis to determine their compositions. The results of the experiment showed that higher collector concentrations did not necessarily lead to increased copper recovery. The appropriate pH conditions, however, could optimize copper recovery. The optimum conditions obtained from this experiment were xanthate concentration of 2000 ppm, pH of 3, and the ore sample 2
Co-Authors Agus Kharmayana Rubaya Agus Prasetya Arifudin Idrus Asih, Yekti Heimbach, Ivano Heru Subaris Kasjono, Heru Subaris Himawan Tri Bayu Murti Petrus Irsal, Muh. Muslikhin Hidayat Prabowo, Adelia Maritza Prabowo Putri, Nur Rofiqoh Eviana Rahmi, Hertantri Yulia Sintawati, Ratna Etika Siti Nurul Aisyiyah Jenie, Siti Nurul Aisyiyah Slamet Sumardi, Slamet Sujoto, Vincent Sutresno Hadi Sutijan Syamsumin, Syamsumin Tampubolon, Aron Pangihutan Christian Tangkas, I Wayan Christ Widhi Herman Teguh Ariyanto Timotius, Daniel Utama, Andhika Putera Wibowo, Decka Pynka Widi Astuti Yamtana Yamtana, Yamtana