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All Journal Proceedings of Annual International Conference Syiah Kuala University - Life Sciences & Engineering Chapter Jurnal Otomasi Kontrol dan Instrumentasi Jurnal Serambi Engineering International Journal of Social Science, Educational, Economics, Agriculture Research, and Technology (IJSET)
Hesti Meilina
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Central composite design applied to purify lemongrass essential oil using vacuum distillation Muhammad Dani Supardan; Dewi Ermaya; Hesti Meilina
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 3, No 2 (2013): Engineering
Publisher : Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (101.976 KB)

Abstract

Vacuum distillation process can be applied for purification of lemongrass essential oil by increasing the concentration of citral in lemongrass essential oil. In this study, the relationship between experimental parameters of purification of lemongrass oil was investigated. The effect of pressure, temperature and pH was examined to determine the best performance of the product yield. CentralComposite Design was applied to optimize the operating parameters of the process. It was found that the product yield of bottom product achieved an optimum level of 98.4% yield at the following reaction conditions, i.e. pressure of 55.9 mbar, temperature of 104.6oC and pH of 4.8
Frequency of use minute concentrations of cadmium in aqueous solution by near infrared spectroscopy and aquaphotomics Hesti Meilina; A. Putra; R. Tsenkova
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

Cadmium (Cd) is a common industrial pollutant with long biological half-life, which makes it a cumulative toxicant. Near-infrared spectroscopy has been successfully used for quick and accurate assessment of Cd content in agricultural materials, but the development of a quick detection method for ground and drinking water samples is of equal importance for pollution monitoring. Metals have no absorbance in the NIR spectral range, thus the methods developed so far have focused on detection of metal-organic complexes. This study uses Aquaphotomics to measure Cd in aqueous solutions by analyzing the changes in water spectra that occur due to water-metal interaction. Measurements were performed with Cd (II) in 0.1 M HNO3, in the 680-1090 nm (water second and third overtones) and 1110-1800 nm (water first overtone) spectral regions, and were subjected to partial least-square regression analysis. A concentration of Cd from 1 mg L-1 to 10 mg L-1 could be predicted by this model with average prediction correlation coefficient of 0.897. The model was tested by perturbations with temperature and other metal presence in the solution. The regression coefficient showed consistent peaks at 728, 752, 770, 780, 1362, 1430,1444, 1472/1474 and 1484 nm under various perturbations, indicating that these water absorbance changes were due to Cd presence. The residual predictive deviation values (RPD) were greater than 2, indicating that the model is appropriate for practical use
Estimasi Kandungan Lemak Pada Biji Kakao Utuh Secara Cepat dan Non-Destruktif dengan Menggunakan Teknologi NIRS Zulfahrizal Zulfahrizal; Agus A. Munawar; Hesti Meilina
Jurnal Otomasi Kontrol dan Instrumentasi Vol 8 No 1 (2016): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) - Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2016.8.1.2

Abstract

Kandungan lemak merupakan salah satu parameter mutu utama dari kakao. Untuk menentukan lemak kakao, umumnya ditentukan dengan pengukuran standard laboratorium yang pada prosesnya melibatkan bahan kimia, memerlukan waktu yang lama dan bersifat destruktif. Teknologi sinar near infrared (NIR) merupakan metode baru yang bersifat ramah lingkungan, cepat dan tanpa merusak objek. Tujuan dari penelitian ini adalah mengaplikasikan teknologi sinar NIR untuk estimasi kadar lemak pada biji kakao utuh. Model prediksi dibangun dengan menggunakan dua metode regresi yang berbeda yaitu metode principal component regression (PCR) dan partial least square regression (PLSR). Spektrum NIR pada biji kakao diakuisisi dengan instrument NIR (Antaris Thermo Nicolet®), sedangkan kadar lemak aktual diukur dengan metode Soxhlet. Perbaikan data sinyal spektrum NIR dilakukan dengan metode Mean Normalization (MN). Hasil studi menunjukan bahwa teknologi NIR mampu mengestimasi kadar lemak biji kakao dengan tingkat akurasi: koefisien korelasi r = 0.82 (PCR) dan 0.83 (PLSR), koefisien Residual Predictive Deviation (RPD) = 1.75 (PCR) dan 1.8 (PLSR). Berdasarkan hasil studi dapat disimpulkan bahwa teknologi sensor berbasis sinar NIR mampu mengestimasi kadar lemak pada biji kakao secara akurat, efisien, dan ramah lingkungan. Teknologi ini dapat diaplikasikan pada proses sortasi dan grading biji kakao utuh.Kata Kunci:  biji kakao, lemak, nirs, plsr, pcr
Reduksi Ion Cu(II) Menggunakan Karbon Aktif dari Sekam Padi Teraktivasi Fisika dan Kimia Eka Purnawan; Abrar Muslim; Nasrullah Razali; Muhammad Zaki; Hesti Meilina; Azwar Azwar
Jurnal Serambi Engineering Vol 5, No 3 (2020)
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v5i3.2149

Abstract

This research proposed a method to produce activated carbon from rice husk by carbonation process, physical activation and chemical activation using NaOH. The performance of activated carbon was tested by batch experiments in which the adsorption system contained 1 g of rice husk activated carbon in 100 mL of artificial wastewater with initial concentration of Cu(II) ion being 148.26 mg/L, initial pH 6, at 27 oC and 1 atm to determine the efficiency of reducing Cu(II) ion over the contact time and presence of stirring on chemical activation. The results showed that the efficiency of reducing Cu(II) ion by rice husk activated carbon increased exponentially with increasing contact time with a maximum value of 74.33% at 90 minutes of contact time. The results also showed that stirring on chemical activation increased the efficiency of Cu(II) ion reduction by 14.94%. Adsorption kinetics studies showed that Cu(II) ion reduction followed the pseudo-second order adsorption equation with the adsorption capacity of 10.18 mg/g and  adsorption rate constant of 0.0013 g/mg.min for rice husk activated carbon without stirring in the chemical activation. Stirring in the chemical activation.increased the capacity and rate of adsorption constant to 12.07 mg/g and 0.0052 g/mg.min, respectively.
Pengembangan Produk Minyak Nilam Dalam Upaya Memenuhi Standar Quality Patchouli Alcohol Menggunakan Chemometric Zikrul Khalid; Hesti Meilina; Syaubari Syaubari; Agus Arip Munawar
Jurnal Serambi Engineering Vol 1, No 2 (2017)
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v1i2.502

Abstract

Minyak nilam merupakan salah satu komoditas ekspor paling besar di Indonesia, akan tetapi saat ini kualitias dari minyak nilam masih sangat rendah hal ini ditandai dengan rendahnya kandungan patchouli alkohol sebagai kompenen utama. Tujuan dari penelitian ini yaitu untuk menganalisis komponen  utama minyak nilam (patchoulialkohol) secara cepat tanpa merusak sampel. Rancangan penelitian ini menggunakan model kalibrasi dan validasi pada patchouli alkohol dengan menggunakan Partial Least Square (PLS) sebagai bagian dari analisis Chemometrics. Hasil penelitian menunjukkan bahwa peningkatan performa kinerja PLS pada pretreatment multiplicative scatter correction dengan nilai RPD yang paling besar yaitu 302,5. Sehingga dapat tergolong ke dalam good model performance dengan nilai koefisien korelasi (r) yang tinggi 0,99, nilai koefisien determinasi (R2) yang bagus 83%, dan nilai error (RMSECV) yang paling kecil yaitu 0,02.
Karakterisasi dan Kinerja Membran Polyethersulfone Termodifikasi Aditif Anorganik secara Blending Polimer Umi Fathanah; Hesti Meilina
Jurnal Serambi Engineering Vol 6, No 4 (2021): Oktober 2021
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v6i4.3515

Abstract

Recently, membrane technology has developed rapidly as a process for water treatment. The membrane process is in demand due to several advantages including being able to work at low temperatures, easier to operate and easy to scale up. Magnesium hydroxide (Mg(OH)2) is an inorganic compound that is inexpensive, non-toxic and hydrophilic, so it has the potential to be used as an additive in membrane fabrication. This study aims to determine the characteristics and performance (permeability and selectivity) of Polyethersulfone (PES) membrane modified with Mg(OH)2, using dimethyl Acetamide (DMAc) as solvent. The membrane was made by blending polymer with phase inversion technique and the characterization carried out included membrane morphological tests, functional group tests, water contact angle tests and evaluating membrane performance by measuring membrane selectivity and permeability. The results showed that the hydroxyl group contained in Mg(OH)2 was able to increase the hydrophilicity which was indicated by a decrease in the water contact angle on the modified membrane to 65o. The Mg(OH)2 additive acts as a pore-forming agent which can be seen in the changes in membrane morphology on the cross-section of the membrane surface. The performance of the membrane resulted in an increase in membrane permeability of 51 L/m2.hour.bar with humid acid rejection of 63%.
EFFECTIVITY OF DOLOMITE ADSORBENT IN PURIFICATION OF Mn AND Cu FROM ACID MINE DRAINAGE Akhyar; Hesti Meilina; Fauzi Djuned; Sri Mulyati; Abrar Muslim
International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET) Vol. 2 No. 6 (2023): MAY
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54443/ijset.v2i6.162

Abstract

The mining industry raises many environmental problems in the ecosystem, one of which is the emergence of acid mine drainage. Because of this issue, this study was conducted to see the performance of dolomite adsorbents in purifying acid mine drainage at iron ore mining in Aceh Besar, Indonesia. The adsorption of Cu2+ metal ions using dolomite adsorbents has the best equilibrium result at a contact time of 15 minutes, the efficiency at equilibrium reaches 92.97%, and the absorption capacity reaches 9.07 mg/g at an initial measured concentration of 19.5 mg/L with an adsorbent weight of 0.2 gr. On the other hand, Mn2+ has the best equilibrium in 30 minutes with an efficiency of 95.17% and an adsorption capacity of 0.92 mg/g at a measured concentration of 5.8 mg/L and an adsorbent weight of 0.6 gr. The obtained kinetic model is a pseudo second order.
Co-Authors A. Putra Abrar Muslim Agus A. Munawar Agus Arip Munawar Akhyar Azwar Azwar Dewi Ermaya Eka Purnawan Fauzi Djuned Muhammad Dani Supardan Muhammad Zaki Nasrullah Razali R. Tsenkova Sri Mulyati Syaubari syaubari Umi Fathanah Zikrul Khalid Zulfahrizal Zulfahrizal