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Alfian Putra
Politeknik Negeri Lhokseumawe
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PEAT WATER PURIFICATION USING MICROFILTRATION CERAMIC MEMBRANES BASED ON KAOLIN AND ACTIVATED CARBON Hayu Zuhra; Alfian Putra; S Salmyah; Selvie Diana
Jurnal Sains dan Teknologi Reaksi Vol 24, No 01 (2026): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v24i01.9404

Abstract

Peat water is brown in color, acidic, and contains high levels of organic matter, meaning it does not meet clean water standards. This study used kaolin-based microfiltration ceramic membranes and activated carbon for peat water purification. The membrane composition varied from kaolin (80, 85, 90, 95, 100)% and activated carbon (20, 15, 10, 5, 0)%, sintering at temperatures of 900, 950, 1000, 1050, and 1100°C to determine the effect of composition and sintering temperature on membrane characteristics and filtration performance. Characterization was performed through density, porosity, flux, surface morphology (SEM), and water filtration tests for pH, TDS, and turbidity. The best results were obtained with a membrane composed of 90% kaolin and 10% activated carbon sintered at 1100°C, with a porosity of 40.08%, density of 1.40 g/cm³, flux of 272.38 L/m²·hour, and pore size of 0.56–3.44 µm. Filtration tests showed a 94% reduction in turbidity, an increase in pH from 4.5 to 6.8, and a 41% reduction in TDS. Keywords: Ceramic Membrane, Kaolin, Microfiltration, Peat Water, Sintering
THE EFFECT OF VARYING CONCENTRATIONS OF SODIUM HYPOCHLORITE (NaOCl) AND BLEACHING TIME ON THE SYNTHESIS OF NANOCHITOSAN FROM SHRIMP SHELL WASTE AND AN EVALUATION OF ITS PURITY A Aliffia; Teuku Rihayat; Alfian Putra
Jurnal Sains dan Teknologi Reaksi Vol 24, No 01 (2026): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v24i01.10980

Abstract

This study aims to optimize the stepwise chemical process for the synthesis of nanochitosan from shrimp shell waste by varying the concentration of sodium hypochlorite (NaOCl) and the bleaching time, as well as to evaluate the characteristics of the resulting product. The synthesis process includes demineralization using HCl, deproteinization using NaOH, bleaching with varying NaOCl concentrations of 0.1%, 0.3%, 0.5%, 0.7%, and 0.9% at bleaching times of 5, 10, 15, 30, and 60 minutes, followed by deacetylation to produce chitosan. Nanochitosan was then synthesized using the ionic gelation method with the addition of tripolyphosphate (TPP). Characterization was performed through yield testing, antimicrobial activity testing, Fourier Transform Infrared (FTIR) spectroscopy, and Scanning Electron Microscopy (SEM). The results showed that the highest yield was obtained with a 0.1% NaOCl treatment for 5 minutes at 93.33%, while the highest antimicrobial activity was observed at a 0.3% NaOCl concentration for 15 minutes, with an inhibition zone diameter of 11.40 mm. Increasing the NaOCl concentration and bleaching duration tended to reduce the yield due to partial degradation of the chitosan polymer structure. FTIR analysis revealed the presence of functional groups characteristic of nanochitosan, namely hydroxyl (O–H) and amine (N–H) groups, as well as C–O and C–N bonds, indicating the success of the nanochitosan synthesis process. SEM characterization of the best sample revealed a relatively homogeneous surface morphology with a finer particle structure. Based on the research results, treatment with 0.3% NaOCl for a bleaching time of 15 minutes is the optimal condition for producing nanochitosan with good antimicrobial activity and suitable characteristics. Keywords: Nanochitosan, shrimp shells, sodium hypochlorite, bleaching, antimicrobial.
COMPARISON OF THE ADSORPTION CAPACITY OF Fe(II) METAL IONS IN WATER USING CHLORIC ACID (HCl)-ACTIVATED KAOLIN AND MICROWAVE-ACTIVATED KAOLIN AS ADSORBENTS Rian Ramadani; Alfian Putra; Raudhatul Raihan
Jurnal Sains dan Teknologi Reaksi Vol 24, No 01 (2026): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v24i01.10957

Abstract

This study aims to determine the effect of varying HCl concentrations and microwave irradiation times on the adsorption capacity of kaolin to absorb Fe(II) ions from water, as well as to determine the optimum adsorption time. Kaolin was activated using HCl solutions with concentrations of 0.5, 1.0, and 1.5 N, followed by microwave irradiation for 35, 45, and 55 minutes. The adsorbent was characterized using Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM). The adsorption process was conducted on a Fe(II) solution with an initial concentration of 10 ppm and contact times of 30, 60, 90, 120, and 150 minutes. The results showed that for the 1.0 N HCl-activated kaolin adsorbent with a contact time of 90 minutes—as determined by Atomic Absorption Spectrophotometry (AAS), which indicated a Fe concentration in the water after adsorption of 0.0063 mg/L—and for the 35-minute microwave irradiation treatment with a contact time of 90 minutes—as determined by Atomic Absorption Spectrophotometry (AAS), showed an iron concentration in the water after adsorption of 0.0280 mg/L. This adsorbent was able to effectively adsorb Fe(II) metal ions as contact time increased until reaching an optimum condition, after which the adsorption rate tended to stabilize due to surface saturation of the adsorbent. Adsorption kinetics analysis indicates that the adsorption process follows a pseudo-second-order kinetic model, as evidenced by a coefficient of determination (R²) approaching 1 and the agreement between theoretical and experimental adsorption capacities. Thus, HCl- and microwave-activated kaolin has the potential to be used as an effective, economical, and environmentally friendly adsorbent for reducing Fe(II) concentrations in water. Keywords: kaolin, HCl activation, microwave, adsorption, Fe(II), adsorption kinetics. 
THE EFFECTIVENESS OF KAOLIN ADSORBENTS MODIFIED WITH ALKYLBENZENE SULFONATE (ABS) SURFACTANT AND ACTIVATED BY ULTRASOUND FOR THE ADSORPTION OF Mg(II) IONS IN WATER H Herdiansyah; Alfian Putra; Zahra Fona
Jurnal Sains dan Teknologi Reaksi Vol 24, No 01 (2026): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v24i01.10958

Abstract

This study aims to analyze the ability of surfactant-modified kaolin and ultrasonically activated kaolin adsorbents to remove Mg(II) from water, as well as to determine the optimal adsorption conditions and the appropriate kinetic model. Kaolin modification was performed using alkyl benzene sulfonate surfactant at concentrations of 35%, 45%, and 55%, while ultrasonic activation was performed with irradiation times of 25, 35, and 45 minutes. The adsorption process was conducted at an initial Mg(II) concentration of 10 mg/L with contact times of 30, 60, 90, 120, and 150 minutes. The adsorbent was characterized using Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM), while the Mg(II) concentration was analyzed using an Atomic Absorption Spectrophotometer (AAS). The results of the study show that the optimum adsorption time was reached at the 90th minute. Surfactant-modified kaolin (35%) yielded the best results with a final Mg(II) concentration of 1.5266 mg/L and a removal efficiency of 84.73%, while ultrasonically activated kaolin with an irradiation time of 45 minutes resulted in a final concentration of 1.5342 mg/L and a removal efficiency of 84.65%. FTIR and SEM results indicate the interaction of Mg(II) ions with the adsorbent surface without damaging the kaolin’s basic structure. Kinetic analysis shows that the adsorption process follows the pseudo-second-order Lagergren model with a coefficient of determination (R²) approaching 1, indicating an effective and stable adsorption mechanism.Keywords: kaolin, adsorption, Mg(II), surfactant, ultrasonic, adsorption kinetics.
Examining Decision Making Practices in Biodiesel Production Processes within Emerging Renewable Energy Industries Harunsyah Harunsyah; M. Yunus; Sariadi Sariadi; Alfian Putra; Salmyah Salmyah
Formosa Journal of Science and Technology Vol. 5 No. 1 (2026): January 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjst.v5i1.385

Abstract

The biodiesel industry faces production decision-making challenges driven by technological constraints, regulatory dynamics, and market uncertainty. This qualitative case study examines strategic and operational decision-making in a medium-scale biodiesel plant in Indonesia, focusing on raw material selection, production processes, efficiency, sustainability standards, and risk management. Data were collected through in-depth interviews with six key informants and document analysis, and analyzed thematically. The findings show that biodiesel production decisions are adaptive and multidimensional, influenced by technical, economic, regulatory, sustainability, and market considerations, with professional experience playing a key role under information constraints. The study highlights the importance of an integrated decision-making framework to enhance performance, sustainability, and competitiveness in the biodiesel industry, and provides managerial and policy-relevant insights for the renewable energy sector.
Co-Authors A Aliffia Andri Riski Maulizar Chatarina Umbul Wahyuni Cut Aja Rahmawati Cut Erika E. Elwina Elwina, E H Herdiansyah Handayani, Utari Hanif, Hanif Harunsyah Harunsyah Hayu Zuhra Helmi Helmi Hesti Meilina Hesti Meilina Humairah, Amanda Inokuma, Emiko Irwan Irwan Irwan, I Izzati, Isra Adelya M Munawar M. Yunus Majuar, Edi Muhammad Nasir Muhammad Yunus Munardy Munardy Nahar, Nahar Nasrul Arahman Nasution, Ali Napiah Novia Lestari Novia Lestari Nur Hasanah, Mutia Nurkuzaifi, Muhammad Nurul Izza Pardi, P R Ridwan Raudhatul Raihan Reza Fauzan Reza Fauzan Rian Ramadani Ridwan, Ridwan S Salmyah Salmyah Salmyah Santo, Ryoko Sariadi Sariadi Selvie Diana Syafruddin Syafruddin Syarifah Keumala Intan Teuku Rihayat Teuku Rihayat Teuku Rihayat Teuku Tarich Akbar Wahyudi, Kiki Salsa Nabila Wijaya, Nanang R Wijaya, Nanang Rahmat Yanti, Azmi Zahra Fona Zaimahwati, Zaimahwati Zaky, Muhammad Zuhra Amalia