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All Journal Reaktor International Journal of Renewable Energy Development METANA JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Bulletin of Chemical Reaction Engineering & Catalysis Seminar Nasional Teknik Kimia Kejuangan Jurnal Aplikasi Teknologi Pangan Indonesian Journal of Chemistry Communications in Science and Technology Indonesia Journal of Halal Jurnal Inovasi Teknik Kimia Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi International Journal of Renewable Energy Development Jurnal Sains Materi Indonesia
Nur Rokhati
Department Of Chemical Engineering, Faculty Of Engineering, Diponegoro University
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry 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 Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Other

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EDUKASI TEKNOLOGI MEMBRAN UNTUK PENYEDIAAN AIR BERSIH DI KECAMATAN SEMARANG SELATAN -JAWA TENGAH Tutuk Djoko Kusworo; Heru susanto; Nita Aryanti; Nur Rokhati; I Nyoman Widiasa
Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Vol 2, No 3 (2020)
Publisher : Fakultas Teknik Universitas Diponegoro

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Abstract

Air merupakan kebutuhan dasar bagi manusia, kebutuhan akan air bersih terus meningkat seiring dengan pertumbuhan manusia. Jumlah air di bumi cenderung tetap, namun kualitas air terus menurun akibat pencemaran. Oleh sebab itu perlu adanya upaya pengolahan air menjadi air bersih sebelum di konsumsi. Semarang selatan merupakan sebuah kecamatan di Kota Semarang yang memiliki posisi strategis karena dekat dengan kota. Letak daerah yang berada pada daerah padat penduduk mengakibatkan sulitnya akses air bersih. Air yang diambil dari air sumur memiliki kualitas yang kurang bagus dimana air yang dihasilkan sedikit keruh dan berbauh amis. Selama ini warga berinisiatif menggunakan tawas sebagai bahan untuk menjernihkan air, namun residu tawas dalam air menyebabkan gangguan kesehatan pada tubuh. Oleh sebab itu, pengolahan menggunakan membran diterapkan untuk mengolah air tersebut menjadi lebih bersih. Teknologi membran tidak membutuhkan bahan kimia tambahan serta biaya operasi yang cukup murah. Kegiatan penyuluhan teknologi membran untuk mengolah air bersih telah dilakukan di Kelurahan Bulustalan Rt 02 RW 03 Kecamatan Semarang Selatan. Sebagai luaran dan juga hasil dari pengabdian ini, dibuatlah makalah/modul pelatihan perancangan filtrasi membran skala rumah tangga untuk mengolah air sumur tercemar menjadi air bersih yang layak konsumsi..
Sequential Microwave-Ultrasound Assisted Extraction of Flavonoid from Moringa oleifera: Product Characteristic, Antioxidant and Antibacterial Activity Aji Prasetyaningrum; Bakti Jos; Ratnawati Ratnawati; Nur Rokhati; Teguh Riyanto; Gian Restu Prinanda
Indonesian Journal of Chemistry Vol 22, No 2 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.65252

Abstract

Moringa oleifera leaves contain secondary metabolites in flavonoid compounds known to prevent several diseases. Therefore, appropriate extraction methods are required to produce extracts with a high yield of flavonoids from Moringa. In this study, the extraction from Moringa leaves was carried out using the sequential microwave/ultrasound-assisted extraction (MUAE) method compared with sequential ultrasound/microwave (UMAE), microwave (MAE), ultrasound (UAE), and maceration (ME). The effects of the time, temperature, and percentage of ethanol were studied on total flavonoid content using AlCl3 colorimetric assay. The extracts were analyzed by Scanning Electron Microscopy (SEM), Fourier Transforms Infrared Spectrophotometry (FTIR), and High-Performance Liquid Chromatography (HPLC). The antioxidant and antibacterial activities were tested using DPPH-scavenging and disc diffusion methods. The results of SEM surface analysis on various extraction methods show differences on each surface. The FTIR spectrum showed the presence of flavonoid O–H at 3200 cm–1, C=O at 1621 cm–1, and C–O at 1019 cm–1. In the results of HPLC, MUAE extracts 16.70 mg/ 100 g flavonoid quercetin at the retention time of 4.5 min, with the highest total flavonoids (2.89 mg QE/g), the highest antioxidant activity (IC50 72.31 µg/mL), and highest antibacterial activity (S. aureus 7 mm, E. coli 2 mm).
PEMANFAATAN TONGKOL JAGUNG SEBAGAI ADSORBEN LIMBAH LOGAM BERAT Nur Rokhati; Aji Prasetyaningrum; Nur ‘Aini Hamada; Adi Lamda Cahyo Utomo; Hery Budiarto Kurniawan; Imam Husnan Nugroho
Jurnal Inovasi Teknik Kimia Vol 6, No 2 (2021)
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/inteka.v6i2.5508

Abstract

Logam berat adalah istilah untuk logam-logam seperti Cd, Cr, Cu, Hg, Ni, Pb, dan Zn yang sering berhubungan dengan polusi dan toksisitas. Adsorpsi merupakan metode yang paling sering digunakan untuk menghilangkan ion logam. Tongkol jagung berpotensi menjadi adsorben karena kadar selulosanya yang tinggi. Penelitian ini bertujuan untuk mengkaji performa tongkol jagung sebagai adsorben ion Cr(VI) dan Cd(II). Penelitian dimulai dengan perlakuan awal adsorben dan dilanjutkan dengan proses adsorbsi. Kadar logam berat dihitung dengan metode spektrofotometri. Nilai efisiensi penyerapan Cd(II) meningkat dengan adanya perlakuan awal menggunakan suhu tinggi. Jumlah logam yang terserap semakin banyak seiring dengan lamanya waktu adsorpsi dengan efisiensi penyerapan sebesar 94,76% untuk Cr(VI) dan 83,96% untuk Cd(II). Penambahan jumlah adsorben tongkol jagung juga meningkatkan efisiensi penyerapan logam kromium hingga 82,33% dan kadmium sebesar 83,98%. Sedangkan jumlah ion Cr(VI) yang terserap tidak linear dengan penambahan kecepatan pengadukan. Berdasarkan hasil penelitian, dapat disimpulkan bahwa tongkol jagung berpotensi digunakan sebagai adsorben ion logam berat dengan efisiensi di atas 80%.  Kata kunci: adsorpsi, kadmium, kromium, tongkol jagung AbstractHeavy metal is a term for metals such as Cd, Cr, Cu, Hg, Ni, Pb, and Zn, often associated with pollution and toxicity. Adsorption is the most commonly used method to remove metal ions. Corncob have the potential to be an adsorbent because of their high cellulose content. This study aimed to examine the performance of corncob as an adsorbent of Cr(VI) and Cd(II) ions. The study began with the pretreatment of the adsorbent and continued with the adsorption process. Heavy metal concentration was calculated by the spectrophotometric method. The value of the absorption efficiency of Cd(II) increased with the pretreatment using high temperature. The amount of metal adsorbed increased with the length of adsorption time with the absorption efficiency of 94.76% for Cr(VI) and 83.96% for Cd(II). The addition of corncob adsorbent also increased the efficiency of chromium metal absorption up to 82.33% and cadmium by 83.98%. Meanwhile, the amount of Cr(VI) ion adsorbed was not linear with increasing stirring speed. Based on the results, it can be concluded that corncob could be used as heavy metal ion adsorbents with an efficiency above 80%. Keywords: adsorption, cadmium, chromium, corn cob
Influence of Microwave Irradiation on Extraction of Chitosan from Shrimp Shell Waste Dwi Titik Apriyanti; Heru Susanto; Nur Rokhati
Reaktor Volume 18 No. 1 March 2018
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (417.081 KB) | DOI: 10.14710/reaktor.18.1.45-50

Abstract

Chitosan is natural polysaccharides which is nontoxic, biodegradable, and biocompatible and have many advantages in various kinds of fields including health, food, agriculture, and industry. Chitosan usually take long time to extract by conventional method for deacetylation process of chitin. Raw material for chitosan can be found in shrimp shell waste. Chitosan manufactures usually need high temperatures and chemicals in large quantities and it takes much time and consumes a lot of energy where will give bad effect to the environment. Recently microwave irradiation as nonconventional energy sources is widely used in chemical reactions. To reduce the impact of environmental pollution due to excessive use of chemical treatment, the objective of this work is processing chitosan under microwave irradiation. Expected production of chitosan with the same mass requires fewer chemicals than conventional heating. In particular, the study will examine the effect of making the chitosan and adding chemicals, reaction time and operating temperature and degree of deacetylation in chitosan with conventional heating methods that the results will be compared using a microwave. In this research will be developed to the design and fabrication of prototype scale extractor for manufacturing chitosan from shrimp shell waste after optimum results obtained from the research laboratory scale. From the research we can conclude that microwave will speed up reaction time. FTIR also showed functional group of chitosan formed from microwave irradiation have same results.  Keywords: chitosan, shrimp shells, microwave
PELATIHAN PEMBUATAN OLAHAN MAKANAN BERBAHAN BAKU TEPUNG MOCAF DI KEC. TEMBALANG Widayat, Widayat; Rahmania, Yusi Luluk; Wardhani, Dyah Hesti; Susanto, Heru; Rokhati, Nur; Rahayu, Hesti
Indonesia Journal of Halal Vol. 4 (1) 2021
Publisher : Pusat Kajian Halal Undip

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/halal.v4i1.12107

Abstract

Dalam rangka mengurangi ketergantungan Indonesia terhadap impor terigu, maka upaya optimalisasi pemanfaatan sumber pangan lokal perlu dilakukan. Sebagai negara agraris, Indonesia kaya akan sumber pangan tinggi karbohidrat. Salah satu komoditi pangan sumber karbohidrat yang melimpah di Indonesia adalah ubi kayu. Pengolahan ubi kayu dapat dilakukan adalah dengan mengembangkan produk turunan tepung ubi kayu, yaitu tepung mocaf (Modified Cassava Fluor). Dalam kegiatan pengabdian ini dilakukan sosialisasi khususnya kepada ibu-ibu PKK di RW 18 Kelurahan Sendangmulyo mengenai keunggulan tepung mocaf dan pelatihan pembuatan olahan makanan homemade berbasis tepung mocaf sebagai pendapatan alternatif.
Effect of microwave and ultrasonic irradiation on the enzymatic hydrolysis of water hyacinth biomass in the presence of surfactants Rokhati, Nur; Ratnawati; Prasetyaningrum, Aji; Anggraini, Widyah; Nugroho, Akbar; Novita, Nasyriyatul Hana; Andarani, Pertiwi; Riyanto, Teguh
Communications in Science and Technology Vol 8 No 1 (2023)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.8.1.2023.1143

Abstract

This paper presents the effect of microwave and ultrasound irradiation on the enzymatic hydrolysis of water hyacinth biomass in the presence of surfactants. Prior to hydrolyzing, the water hyacinth was treated utilizing alkali with and without microwave assistance. It was revealed that the microwave improved the removal of lignin and hemicellulose. The treated water hyacinth biomass was also characterized using Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), and Fourier-Transform Infrared (FT-IR) Spectroscopy. The effect of surfactant and the assistance of microwave and ultrasound were comprehensively studied. Some parameters varied, including stirring speed, surfactant type, concentration, and reaction time. The results indicated that microwave and ultrasound could enhance the reaction rate. Tween 80 here could improve conventional, microwave-assisted, and ultrasound-assisted hydrolysis of water hyacinth biomass. It was found that the ultrasound-assisted hydrolysis was better than that of others. The results of this research can be used as the groundwork for further developing the lignocellulosic biomass hydrolysis process, especially in an advanced enzymatic hydrolysis process.
Double Emulsion Based Alginate/Chitosan Prepared by Ultrasound for Bioactive Encapsulation Prasetyaningrum, Aji; Ashianti, Aulia Dwi; Rokhati, Nur; Setyaningsih, Yuliani
Jurnal Sains Materi Indonesia Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2025.9018

Abstract

Water-in-oil-in-water (W/O/W) emulsion is an effective technology for encapsulating bioactivity but has poor stability. This study aims to evaluate the effect of ultrasonication on the preparation of double emulsions with varying alginate/chitosan ratios (1:1, 1:2, 2:1) and sonication times between 0 and 7 minutes. The results showed that a sonication time of 7 minutes resulted in the best storage stability (0.00–1.02%) and thermal stability (17.13–23.21%), a significant decrease in droplet size (2.08–2.87 μm), and higher emulsion activity index (EAI) (16.11–38.10 m2/g) and emulsion stability index (ESI) (63.28–89.74 min) values. The alginate/chitosan ratio of 2:1 also gave the most optimal results with storage stability of 4.58%, thermal stability of 36.23%, droplet size of 2.08–4.14 μm, and EAI and ESI values of 16.12 m2/g and 48.42 min. The ultrasonic-assisted alginate/chitosan double emulsion method effectively improved the stability and bioavailability of bioactive and presents significant potential for food and pharmaceutical applications.
Impact of crosslinking on quaternary ammonium poly(vinyl alcohol)/polyquaternium-7 anion exchange membranes for alkaline polymer electrolyte fuel cells Samsudin, Asep Muhamad; Rokhati, Nur; Prasetya, Nor Basid Adiwibawa; Kumoro, Andri Cahyo; Anggoro, Didi Dwi; Nasher, Kharissa; Wahyudi, Dhiky; Roschger, Michaela; Hacker, Viktor
International Journal of Renewable Energy Development Vol 14, No 4 (2025): July 2025
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.60897

Abstract

Alkaline Polymer Electrolyte Fuel Cells (APEFCs) have emerged as a promising candidate for clean energy production. Anion exchange membrane (AEM) is an essential element of alkaline polymer electrolyte fuel cells for its role in facilitating hydroxide ion conduction. The objective of this study is to investigate the effect of a glutaraldehyde-based crosslinker solution on the performance of anion exchange membranes (AEMs) fabricated using quaternary ammonium poly (vinyl alcohol) (QPVA) as the backbone polymer and polyquaternium-7 as the second polymer. The introduction of a glutaraldehyde-based crosslinking agent was purposed to enhance membrane stability and reduce excessive swelling. The study evaluates the impact of varying glutaraldehyde concentrations on membrane performance. FTIR analysis confirms the presence of key functional groups of QPVA, polyquaternium-7, and the crosslinking agent. SEM images reveal that the membranes demonstrate dense and homogeneous physical structure. The results show that water uptake, swelling degree, ion exchange capacity (IEC), and hydroxide conductivity are influenced by the concentration of the glutaraldehyde solution. The QP-GA-13 AEM exhibited the best overall performance, achieving the highest tensile strength of 31.1 MPa and the highest hydroxide ion conductivity of 4.15 mS cm⁻¹ at 70°C. In single-cell tests, this membrane delivered a maximum power density of 85 mW cm⁻² and a current density of 350 mA cm⁻² at 80°C under humidified oxygen conditions.
Co-Authors . Widayat Adi Lamda Cahyo Utomo Aji Prasetyaningrum Aji Prasetyaningrum Aji Prasetyaningrum Aji Prasetyaningrum Al Farrel A. Raemas Ananda Dwi Utomo Andri Cahyo Kumoro Anggara Eka Permana Anggraini, Widyah Apriyanti, Dwi Titik Asep Muhamad Samsudin, Asep Muhamad Ashianti, Aulia Dwi Bakti Jos Bambang Pramudono Didi Dwi Anggoro Dwi Titik Apriyanti Dwi Titik Apriyanti Dyah Ayu Kresnianingrum Dyah Hesti Wardhani Gian Restu Prinanda Giovanni Anward Hacker, Viktor Hamada, Nur ?Aini Hanik Handayani P.L. Heru Cahyana Heru Susanto Hery Budiarto Kurniawan Hesti Rahayu I Nyoman Widiasa I Nyoman Widiasa Imam Husnan Nugroho Irsan Adhiatama Luthfi Kurnia Dewi Marcelinus Christwardana Mohammad Sulchan Mohammad Sulchan Muhamad Alfin Indra Kusuma Muhamad Zainudin Naliawati Prastiya Ningrum Nasher, Kharissa Nita Aryanti Nor Basid Adiwibawa Prasetya Novita, Nasyriyatul Hana Nugroho, Akbar Nur ‘Aini Hamada Nur ‘Aini Hamada Paramarta Siwi R. Pertiwi Andarani Rahmania, Yusi Luluk Rangga Warsita Aji RATNAWATI Ratnawati Ratnawati Reisa Novita Marpaung Riyanto, Teguh Roschger, Michaela Suryo Tetuko Teguh Riyanto Titik Istirokhatun Tutuk Djoko Kusworo Wahyudi, Dhiky Wulan Sari Gusniawati Yuliani Setyaningsih Yusuf Hidayat