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CHEESA: Chemical Engineering Research Articles
Published by Universitas PGRI Madiun
ISSN : 26148757     EISSN : 26152347     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
CHEESA: Chemical Engineering Research Articles is scientific journal that publishes articles in the field of Chemical Engineering, Organic Chemistry, Inorganic Chemistry, Analytical Chemistry, Biochemistry, and Physical Chemistry. It is a journal to encourage research publication to research scholars, academicians, professionals and student engaged in their respective field. Author can submit manuscript by doing online submission. Author should prepare their manuscript to the instructions given in Author Guidelines before doing online submission. Template of article can be download in right sidebar. All submissions will be reviewed and evaluated based on originality, technical research, and relevance to journal contributions. Chemical Engineering Research Articles is published by Universitas PGRI Madiun on June and December.
Arjuna Subject : -
Articles 97 Documents
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Coffee Waste as a Potential Adsorbent for Peat Water Treatment Rahma Amalia; Sarah Fiebrina Heraningsih; Oki Alfernando; Sri Mundarti; Muhammad Haviz; Nadia Elvina; Sonia Nizal Putri; Resi Lisma Kinasih; Asmara; Yuzi Chantika Pratama; Ahmad Fadhilah Ashidiqie
CHEESA: Chemical Engineering Research Articles Vol. 8 No. 1 (2025)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v8i1.22320.23-34

Abstract

Peat water is characterized by high acidity, turbidity, and poor sensory qualities, which limit its usability. This study evaluated the effectiveness of thermally activated coffee waste adsorbent (CWA) for peat water treatment. CWA was prepared by heating coffee waste at 250°C, followed by washing and drying at 60°C. Batch adsorption experiments were conducted using 1–3 g of CWA in 200 mL of peat water at 30°C, stirred at 150 rpm for 30 minutes. The results revealed significant improvements in water quality: pH increased from 3.85 to 4.62; turbidity was reduced by 99.37% (from 75 to 0.47 NTU); conductivity decreased by 30.7% (from 424 to 294 ?S/cm); and total dissolved solids (TDS) dropped by 93.3% (from 208 to 14 ppm). The Langmuir isotherm model (R² = 0.7297) provided a better fit than the Freundlich model (R² = 0.5845), indicating monolayer adsorption behavior with a maximum capacity of 0.1634 mg/g and a favorable separation factor (RL = 0.0057). Sensory evaluation confirmed enhanced color and odor. These findings support the use of CWA as a sustainable and low-cost adsorbent for improving peat water quality.
Isotherm and Kinetics Adsorption of Ammonium using Cocopeat Biochar Activated Meta Fitri Rizkiana; Lilis Nurhasanah; Nanda Ayudiyah Andriani; Bekti Palupi; Boy Arief Fachri; Istiqomah Rahmawati; Helda Wika Amini; Endar Hidayat
CHEESA: Chemical Engineering Research Articles Vol. 8 No. 1 (2025)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v8i1.22466.43-54

Abstract

Nitrogen recovery from wastewater is capable of preventing eutrophication, offering economic benefits, and reducing carbon footprint from synthetic fertilizer production. Biochar has been explored as adsorbent for ammonium (NH??) removal. Therefore, this study aimed to investigate the potential of biochar derived from cocopeat as adsorbent for NH?? removal. Cocopeat was modified by potassium hydroxide (KOH) and pyrolyzed at 500°C for 2 h to produce activated biochar. Kinetics and isotherm studies were conducted to examine adsorption mechanisms. Fourier Transform Infrared (FTIR) data showed that the resulting biochar after activation and adsorption contained hydroxyl O–H and C–O groups, while a new N–H band confirmed the interaction with NH?? ions. Biochar adsorbed NH?? ions with a maximum capacity of 0.3078?mg/g. FTIR spectra showed shifts and changes in the intensity of functional group bands, confirming the interaction between NH?? ion and the active sites on biochar surface. Adsorption followed Langmuir isotherm and pseudo-first-order kinetics model, with an optimal contact time of 5 h. These results suggested that cocopeat-based biochar had potential as an effective NH?? adsorbent.
Catalyst Losses and Air Flow Rate Effect on Cyclone Efficiency at Residue Fluidized Catalytic Cracking Unit Rizka Wulandari Putri; Umi Sarah; Ali Hanif; Rahmatullah; Selpiana; Muhammad Haviz
CHEESA: Chemical Engineering Research Articles Vol. 8 No. 1 (2025)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v8i1.22520.55-62

Abstract

Residue Fluidized Catalytic Cracking Unit (RFCCU) in the oil and gas industry is equipped with a regenerator that uses a cyclone to separate solid catalyst from reaction gases. Oxidation gases rise to the top of the regenerator before entering the cyclone stage. The cyclone inlet velocity depends on factors such as Main Air Blower (MAB) flow, dilute phase temperature, and dense bed temperature. Therefore, this study aimed to determine the effect of catalyst losses and combustion air flow rate on cyclone efficiency of RFCCU. The efficiency was determined simply by calculating catalyst losses compared to the catalyst inlet. The results showed that the dilute phase and dense bed temperature parameters had an indirect influence on cyclone inlet velocity. Furthermore, the separation efficiency of the device was 88% with 12 % catalyst loss by limiting the combustion air flow rate to a maximum value of 1,559 t/d. These limits should be met to prevent cavitation and reduce cyclone efficiency.
Pressure Effect on Turbidity, pH, Lead Content, and Coliform during the Demineralization Process of Brackish Water Camelia Amandasari; Ilma Fadlilah; Rosita Dwityaningsih
CHEESA: Chemical Engineering Research Articles Vol. 8 No. 2 (2025): In Progress
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v8i2.17424.103-109

Abstract

Brackish water is a mixture of freshwater and seawater and typically exhibits intermediate physicochemical characteristics. Cilacap City is located in a coastal area, resulting in the mixing of freshwater from river systems with seawater intrusion, thereby producing brackish water with relatively high mineral content. Demineralization is a water purification method that can be applied to treat this type of water or wastewater, producing water with significantly reduced mineral content suitable for various uses. Therefore, this research aimed to investigate the effects of operating pressure on turbidity, pH levels, lead (Pb) concentration, and coliform content during the demineralization of brackish water. This research was carried out from March to June, and the sample of brackish water was obtained from the Northern Cilacap Payau Forest Tour Area. Purification method of demineralization process consists of the filtering of silica sand, zeolite adsorption, membrane filtration, and ion exchange with anion resin and cation resin repeatedly. The best result obtained was a pressure of 10 psi with a pH level of 5.9, decreasing turbidity of 90.81%, lead level content of 28.125%, and coliform bacteria of 55.49%
Green Synthesis of CuO-Doped Fe₃O₄ for Degradation of Crystal Violet Dye: RSM-Based Optimization Ady Mara; Fahma Riyanti; Desnelli; Poedji Loekitowati Hariani
CHEESA: Chemical Engineering Research Articles Vol. 9 No. 1 (2026): In Progress
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v9i1.24394.1-14

Abstract

The limitations of CuO photocatalyst include high electron–hole recombination and low charge-transfer efficiency. In this context, doping with Fe3O4 is used to form a heterojunction, which enhances charge separation, increases electron transfer, and imparts magnetic properties for easy separation and reuse of the catalyst. Therefore, this study aimed to synthesize a biphasic CuO/Fe₃O₄ composite using Rhodomyrtus tomentosa leaf extract as a green reducing agent, and evaluate the performance as a photocatalyst for the degradation of Crystal Violet Dye (CVD). Structural, morphological, optical, and magnetic properties were characterized using X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM–EDX), UV–Vis diffuse reflectance spectroscopy (DRS), and vibrating sample magnetometer (VSM). XRD patterns confirmed the coexistence of CuO and Fe₃O₄ phases, indicating successful composite formation. VSM analysis reported that the composite had magnetic properties with a saturation magnetization and band gap values of 46.92 emu/g and 1.63 eV, respectively. Process optimization was conducted using Response Surface Methodology (RSM) based on Central Composite Design (CCD). The results showed that the quadratic model was the most appropriate and statistically significant model, indicated by a p-value < 0.05 with a coefficient of determination (R2) of 0.9953. In addition, optimization of the degradation process led to CVD degradation efficiency of 98.73% under optimal conditions of initial concentration of 25.4 mg/L, pH 9.5, and irradiation time of 39.4 min with a visible-light radiation source. The composite also reported good reusability, retaining 92.11% of degradation efficiency after five cycles, confirming the potential as a magnetically recoverable, environmentally sustainable photocatalyst for wastewater treatment applications.
Thermoplastic Elastomers of Polystyrene-Based Reinforced with Natural Rubber and Carbon Filler from Oil Palm Empty Fruit Bunches Indah Agus Setiorini; Achmad Faisal Faputri; Rahma Nuryanti; Amiliza Miarti; Muhammad Rasyad Hilmi; Hasrinah Hasbullah
CHEESA: Chemical Engineering Research Articles Vol. 9 No. 1 (2026): In Progress
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v9i1.23348.15-25

Abstract

Polystyrene (PS) has limited resistance to extreme temperatures, often becoming soft, brittle, and losing its elasticity. To address these limitations, the material was modified by adding Natural Rubber (NR) and oil palm empty fruit bunch (OPEFB) carbon filler. Therefore, this research aimed to modify the surface of PS by adding NR and OPEFB carbon filler, followed by analysis of the resulting morphology, thermal stability, and enthalpy change (ΔH) of the composites. The polystyrene grafting with maleic anhydride (PS-g-MA) was carried out at 75 °C for 10 minutes. The composition variations of PS-g-MA/NR/OPEFB carbon filler were (30:65:5) wt%, (30:60:10) wt%, (30:55:15) wt%, (30:50:20) wt%, and (30:45:25) wt%. The highest thermal stability (T5%) was achieved with 10% filler at 363°C. However, morphological analysis showed that increasing the filler content to 20% provides an optimal point in balancing interfacial interaction (maximum adhesion) and phase dispersion, with a ΔH value of -27.86 J/g.
Potato Peel Starch Bioplastics Reinforced with Microcrystalline Cellulose, PVA, and Chitosan: Mechanical, Thermal, and Antibacterial Properties Mochamad Viky Afandy; Andoko; Riduwan Prasetya; Muhammad Faizullah Pasha; Mohammad Sukri bin Mustapa
CHEESA: Chemical Engineering Research Articles Vol. 9 No. 1 (2026): In Progress
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v9i1.24438.26-40

Abstract

The increasing accumulation of petroleum-based plastic waste has led to the development of biodegradable packaging materials from renewable agro-industrial resources. Therefore, this study aims to synthesize biodegradable potato peel starch/polyvinyl alcohol (PPS/PVA) blend bioplastic films reinforced with microcrystalline cellulose (MCC) and functionalized with chitosan. Films were prepared through solution casting with varied MCC contents and characterized for density, tensile properties, crystallinity, thermal stability, morphology, antibacterial activity, and biodegradability. The results showed that an increase in MCC improved film compactness, tensile strength, crystallinity, and surface uniformity, showing stronger interfacial interactions within the polymer matrix. FTIR confirmed enhanced hydrogen bonding among starch, PVA, chitosan, and MCC, while thermal analysis showed improved resistance to degradation. The produced films also exhibited antibacterial activity against Staphylococcus aureus and Escherichia coli, with the highest performance observed at higher MCC loading. Despite reinforcement, the products remained biodegradable in soil. These results show the potential of PPS/PVA blend bioplastic films containing PPS waste as sustainable materials for active packaging applications.

Page 10 of 10 | Total Record : 97

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