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All Journal Eksergi: Chemical Engineering Journal KOVALEN: Jurnal Riset Kimia JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Chemistry Indonesian Journal of Chemical Research FLUIDA JKPK (Jurnal Kimia dan Pendidikan Kimia) Jurnal Sains dan Teknologi Reaksi International Journal of Applied Technology Research Jurnal Difusi Industrial Research Workshop and National Seminar Journal Serambi Engineering (JSE) Journal of Green Science and Technology
Paramitha, Tifa
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Aerospace Engineering Humanities 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 Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation Other

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The Effect of Variations in Sulfuric Acid - Oxalic Acid Electrolyte Concentration and Additional Aeration on 1100 Series Aluminum Anodization Results Leoanggraini, Unung; Irianto, Indra; Aji, Restu; Paramitha, Tifa; Sihombing, Rony
Journal of Green Science and Technology Vol 8 No 2 (2024): Journal of Green Science and Technology Vol.8 No.2 September 2024
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v8i2.9425

Abstract

Aluminum is one of the materials used in making various types of goods because it has good properties such as being light, ductile and has good corrosion resistance. One of the disadvantages of aluminum is its low level of hardness. This can be overcome by treating aluminum, one of which is the anodization process. In this research, variations in the type of electrolyte used were sulfuric acid-oxalic acid, the electrolyte concentration was 16% with an interval of 0.5, the temperature used was room temperature with a current density of 3/dm2 and a coating time of 30 minutes. The aim of this research is to determine the acid concentration and the effect of the aeration system on mechanical properties. From the data obtained, it was found that the difference in weight of the best metal with the addition of aeration at a concentration of 13.5+2.5 was 0.0411 gr. This shows that as the concentration of oxalic acid increases it can accelerate the process of aluminum oxide formation, then for electrolyte concentrations of 16+0, 15.5+0.5, 15+1, 14.5+1.5 and 14+2 the difference in mass weight metals increased respectively by 0.0337 gr, 0.0335 gr, 0.0366 gr, 0.0390 and 0.0411 gr. In the anodization process without   additional aeration, the best metal weight difference is found at an electrolyte concentration of 13.5+2.5 of 0.0401 gr. This shows that increasing the concentration of oxalic acid can accelerate the process of aluminum oxide formation. Then at electrolyte concentrations of 16+0, 15.5+0.5, 15+1, 14.5+1.5 and 14+2 the difference in metal mass weight gradually increases by 0.0182 gr, 0.0293 gr, 0.0318 gr, 0.0322 and 0.0362 gr. Keywords: Aluminum, Anodization, Oxide Coating, Electrolyte Solution, Sulfuric Acid, Oxalic acid
Utilization of Coconut Shell and Coffee Grounds as Briquettes Using the Carbonization Method Adhitasari, Alfiana; Manfaati, Rintis; Paramitha, Tifa; Zahwa, Keisya Adellia; Setiawan, Kiranna Shalmadevy; Yusuf, Yusmardhany
Eksergi Vol 22 No 3 (2025)
Publisher : Prodi Teknik Kimia UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i3.15128

Abstract

Biomass-based briquettes offer a renewable energy alternative that can help reduce CO₂ emissions. Coconut shells and coffee grounds are promising waste materials due to their high calorific value. This study aimed to optimize the composition and carbonization time in producing briquettes from these two materials. The briquettes were prepared following SNI 01-6235-2000 and export briquette standards. The process included drying, carbonization at 300 °C for 60, 90, 120, 150, and 180 minutes, sieving, mixing, molding, and drying. Coconut shells and coffee grounds were mixed at weight ratios of 9:1, 8:2, 7:3, 6:4, and 5:5 with a total of 46.5 grams and 8.5 grams of adhesive. Briquette quality was evaluated based on moisture content, ash content, volatile matter, density, calorific value, and fixed carbon. The 9:1 composition yielded the highest calorific value of 6,472 cal/g, while a carbonization time of 90 minutes produced the best calorific value of 6,504 cal/g. The results show that a high proportion of coconut shells with limited coffee grounds and optimal carbonization time can produce briquettes with high energy potential, suitable for use as an alternative fuel.
Utilization of Natural Zeolite Impregnated with Fe for Decolorization of Methylene Blue Paramitha, Tifa; Aulia, Bunga; Azzahra, Tarisha Aulia; Taufiqurohim, Teguh; Adhitasari, Alfiana
Indonesian Journal of Chemical Research Vol 13 No 3 (2026): Edition for January 2026
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2026.13-tif

Abstract

Wastewater containing methylene blue, discharged into rivers, significantly impacts water quality due to its resistance to natural degradation. This study investigated the treatment of methylene blue using the photo-Fenton method, employing UV light to generate hydroxyl radicals (•OH) through the reaction of hydrogen peroxide (H₂O₂) and Fe catalyst. Natural zeolite was used as a support material, activated with NaOH solution, and impregnated with FeSO₄·7H₂O. Semi-quantitative EDS analysis indicated an iron content of 6.2 wt%. The XRD result shows that the crystalline iron phase was hematite. The photo-Fenton experiments were performed at a catalyst dosage of 0.1 g/L to degrade methylene blue with an initial concentration of 20 mg/L by varying pH levels (3, 5, 7) and H₂O₂ concentrations (15, 30, 45 mM). The optimal conditions were found to be a combination of 45 mM H₂O₂ concentration, pH 3, and under 365 nm UV lamp irradiation, achieving a maximum decolorization efficiency of 99.77% at 120 minutes. H₂O₂ concentration did not significantly affect final decolorization percentage, indicating that excess H₂O₂ does not enhance degradation beyond a certain threshold. The lowest final methylene blue concentration achieved was 0.05 mg/L, and the final chemical oxygen demand (COD) was reduced to 243.6 mg/L.
Sintesis dan Karakterisasi Semikonduktor TiO2 Doping Magnesium dengan Metode Hidrotermal: Synthesis and Characterization of Magnesium Doped TiO2 Semiconductor by Hydrothermal Method Paramitha, Tika; Utami, Khoirunnisa; Anggraini, Yuki Martha; Paramitha, Tifa
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 1 (2023): April Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i1.16275

Abstract

Semiconductors are materials that range between insulators and conductors in terms of conductivity value. Titanium Dioxide (TiO2) is a semiconductor that is widely applied to various things. TiO2 has the benefits, such as being environmentally stable and inexpensive. TiO2 is photoactive in the range of ultraviolet radiation due to the band gap value of 3.2 eV. However, ultraviolet is only produced from 5% of sunlight. The research aimed to narrow the band gap energy so as to maximize light absorption. This is done by modification with the addition of Mg elements to TiO2 materials at different mass variations of Mg (1%, 1.5%, 2%) to the mass of TiO2 which is often referred to as doping. TiO2 was doped by Mg using a hydrothermal method for 24 hours with a temperature of 180áµ’C, followed by 2 hours of calcination at 400áµ’C. Then, TiO2 and Mg-doped TiO2 particles were characterized by SEM-EDX, FTIR, and UV-Vis. Based on the results of TiO2 and Mg-doped TiO2 particle characterization using SEM, both particles are spherical in shape. The success of Mg doping was identified from the data of EDX characterization, which revealed that the mass % of the Mg component increased with the greater Mg doping concentration on TiO2 particles. There was no structural change following Mg doping on TiO2 particles, as evidenced by the same peak based on the results of FTIR characterization of TiO2 and Mg-doped TiO2 particles. Moreover, a 2% Mg mass doping on pure TiO2 resulted in a decrease in band gap energy to 3.16 eV, in which the pure TiO2 was 3.39 eV. The mass doping of Mg on TiO2 required further optimization to obtain the maximum band gap energy reduction for photocatalytic applications.
Anodizing Characteristics of AA1100 in 20% Sulfuric–Phosphoric Acid Electrolytes under Aerated and Non-Aerated Conditions at Various Times Tri Hariyadi; Tita Rosita; Aniqa Arjumand Bano Harvani; Silvia Fatimatur Rahmawati; Tifa Paramitha; Adhitasari, Alfiana; Sihombing, Rony
Journal of Green Science and Technology Vol 10 No 1 (2026): Journal of Green Science and Technology Vol. 10 No.1 March 2026
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v10i1.11796

Abstract

Aluminum alloy AA1100 exhibits good corrosion resistance but suffers from low surface hardness and wear resistance, which can be improved through anodizing. However, limited studies have examined the combined influence of sulfuric–phosphoric acid electrolyte composition and aeration. This study investigates the effect of sulfuric–phosphoric acid electrolyte composition and aeration on oxide layer mass, thickness, and hardness during anodizing. Anodization was conducted using a total electrolyte concentration of 20% with varying sulfuric acid (15–20%) and phosphoric acid (5–0%) ratios at a current density of 3 A/dm², operating times of 15 and 30 minutes, and room temperature under aerated and non-aerated conditions. The results show that aeration significantly increased oxide layer formation, yielding an average oxide mass of 0.0173 g compared to 0.0106 g in non-aerated systems. The maximum oxide mass (0.0375 g) was obtained at 20% sulfuric acid with aeration for 30 minutes. The highest oxide layer thickness of 47.94 µm was achieved using a 19% sulfuric acid–1% phosphoric acid electrolyte under aerated conditions at 30 minutes. Meanwhile, the maximum surface hardness of 352.60 HVN was obtained at 15% sulfuric acid–5% phosphoric acid with aeration for 15 minutes. These findings demonstrate that electrolyte composition and aeration play a critical role in optimizing anodic oxide growth and mechanical properties of AA1100.
Utilization Of Sengon Wood Sawdust Waste as Esterified Cellulose-Based Bioadsorbent for CD(II) Wastewater Purification Fauzan, Rizky; Mujahidah, Nisa Rahmah; Nugraha, Teguh Aditya; Azzahra, Nasya; Paramitha, Tifa; Soeswanto, Bambang; Sihombing, Rony Pasonang
Journal of Green Science and Technology Vol 9 No 3 (2025): Journal of Green Science and Technology Vol. 9 No. 3 December 2025 Special Editio
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i3.10650

Abstract

Cadmium (Cd) is a heavy metal with high toxicity that can enter the body through contaminated food chains, so wastewater containing cadmium needs to be treated before being discharged into the environment. This study uses adsorption methods to reduce Cd(II) concentration in artificial wastewater by utilizing modified sengon wood sawdust cellulose as a bioadsorbent. Adsorption tests were conducted in batch mode at room temperature with constant stirring, and the results were analyzed using AAS. The objective of this study was to determine the optimum adsorption conditions using Response Surface Methodology (RSM) and to determine the adsorption capacity of the modified bioadsorbent based on the Freundlich or Langmuir adsorption isotherm models. The variations in bioadsorbent dose in this study were 2, 4, and 6 g/L; adsorption time variations were 30, 60, and 90 minutes; pH variations were 3, 4, and 5. Based on the design expert 13 RSM software, the optimum adsorption conditions for citric acid-modified bioadsorbent are a bioadsorbent dose of 3.957 g/L, time of 31.655 minutes, and pH of 4.968. For the EDTA-modified bioadsorbent, the optimum conditions were a bioadsorbent dose of 3.836 g/L, time of 30 minutes, and pH of 4.708. The results of the adsorption isotherm modeling indicate that the citric acid-modified and EDTA-modified bioadsorbents are more suitable for the Freundlich isotherm model due to their higher determination coefficient (R²). Thus, the adsorption capacities for the citric acid-modified and EDTA-modified bioadsorbents were determined to be 1.7828 mg/g and 1.5776 mg/g, respectively.
Anodizing Characterization of Aluminum 1100 Composition of Sulfuric Acid - Oxalic Acid 16% With Aeration and Nonaeration at Different Time Intervals Nurcahyo, Nurcahyo; Rizky, Rian Muhamad; Diningrat, Mangku Joyo; Adihartanto, Synbi Pasya Octaviarine; Khoirunisa, Tira Nur; Paramitha, Tifa
Journal of Green Science and Technology Vol 9 No 3 (2025): Journal of Green Science and Technology Vol. 9 No. 3 December 2025 Special Editio
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i3.10653

Abstract

Aluminum is a type of metal that is widely used in the industrial and household fields. This study aims to analyze the effect of variations in sulfuric acid and oxalic acid concentrations, as well as aeration systems, on the surface characteristics of aluminum 1100 through the anodizing process. The anodizing process is one of the surface treatment processes that is carried out with the aim of improving or improving the properties of a metal, including resistance to wear, increasing hardness, and aiming to beautify the appearance itself. This anodizing test is with sulfuric acid-oxalic acid electrolyte solution, electrolyte concentration 16%, at room temperature with a current density of 3/dm2 in time intervals of 20 minutes and 30 minutes. The data obtained from the test results showed that the oxide layer was formed maximally in the aeration system with a concentration of 13.5+2.5 and a time interval of 30 minutes of 0.0411 gr. This shows that the addition of oxalic acid and oxygen can accelerate the formation of the oxide layer. At electrolyte concentrations of 16+0, 15.5+0.5, 15+1, 14.5+1.5 and 14+2, there was an increase in the difference in oxide mass by 0.0337 gr, 0.0335 gr, 0.0366 gr, 0.0390 and 0.0411 gr.
Effectiveness Of Activated Carbon Of Reed (Imperata Cylindrica) As Methyl Orange Bioadsorbent with Batch Adsorption Method Suminar, Dian Ratna; Harianto, Dicky; Fauziah, Najmi; Febrian, Dea Tri; Kharisma, Luthfiana; Paramitha, Tifa
Journal of Green Science and Technology Vol 9 No 3 (2025): Journal of Green Science and Technology Vol. 9 No. 3 December 2025 Special Editio
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i3.10655

Abstract

The use of synthetic textile dyes causes environmental problems, namely the waste produced is still colored and difficult to degrade. Methyl orange is a synthetic dye in the textile industry which has low solubility in water, is difficult to degrade, has the potential to be carcinogenic and is toxic. To overcome this, adsorption can be carried out using activated carbon from reeds. This research aims to find out how active carbon of reeds is absorbed in methyl orange using the batch method with Langmuir isotherm analysis. Research methods include pretreatment of reeds, manufacture and activation of reeds carbon, testing the characteristics of activated carbon, adsorption process, and analysis of adsorption results using a UV-Vis spectrophotometer. The research was carried out by varying the concentration of methyl orange solution, adsorption time, and mass of activated carbon used. From the research, optimum conditions were obtained for the methyl orange adsorption process using reed activated carbon for 120 minutes with an activated carbon mass of 0.3 grams, a final concentration of 7.328 ppm was obtained with an initial concentration of 10 ppm, and a % adsorption of 26.72%.
Turmeric (Curcuma longa) Extract Characterization for Corrosion Inhibitor using Microwave-Assisted Extraction Paramitha, Tifa; Luviana, Angely; Putri, Angelina; Reynaldi, Randi; Azzahra, Rafila Chika; Paramitha, Tika; Sihombing, Rony Pasonang
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 1 (2024): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v9i1.79249

Abstract

Metallic corrosion, the deterioration process induced by the interaction between metals and corrosive environments, poses a significant challenge to material integrity and longevity. Corrosion inhibitors have been identified as an effective approach among various mitigation strategies. Natural extracts, such as those derived from turmeric/Curcuma longa, have garnered attention for their potential as eco-friendly corrosion inhibitors. This study endeavors to extract, characterize, and evaluate turmeric extract's efficacy as a corrosion inhibitor within a 30% acetic acid solution. Employing microwave-assisted extraction with a 96% ethanol solvent facilitated the isolation of the extract, which was subsequently subjected to qualitative analysis through phytochemical screenings and Gas Chromatography-Mass Spectrometry (GC-MS). These analyses confirmed the presence of antioxidative phytochemicals, including alkaloids, terpenoids, turmeronoids, curcumin, sesquiterpenoids, and phenols. The corrosion inhibitory properties of turmeric extract were assessed via immersion and flow loop experiments, revealing a notable reduction in corrosion rates—from 0.1540 mm/year to 0.0801 mm/year in immersion tests and from 5.3747 mm/year to 2.9369 mm/year in flow loop tests. Such outcomes underscore turmeric extract's potential as a viable corrosion inhibitor, attributed primarily to the chemical interactions facilitated by curcumin's phenolic and carbonyl groups with the metal surface, thereby enhancing protective efficacy. The inhibitor efficiency was quantified at 47.9743% and 45.3565% for immersion and flow loop tests, highlighting the extract's substantial inhibitory performance.
Characterization of SiO₂/C Composites from Bamboo Leaves and Graphite for Lithium-Ion Battery Anode Paramitha, Tika; Adisa, Farhan; Hakim, Muhammad Hayyi Rahman; Paramitha, Tifa
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 10, No 1 (2025): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v10i1.91844

Abstract

Silicon dioxide (SiO₂) is a key component found in various biomass materials, including bamboo leaves. This study aims to synthesize SiO₂/C composites using bamboo leaves as the silica source and graphite as the carbon source, targeting their application as anode materials in lithium-ion batteries (LIBs). Silica particles were first prepared using the sol-gel method and characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). The SiO₂/C composite was synthesized through a solid-state reaction by mixing SiO₂ and graphite in varying SiO₂ weight percentages of 0%, 5%, 20%, and 100%, followed by calcination at 500 °C for 30 minutes under argon atmosphere. The morphology and composition of the resulting composites were analyzed using SEM-EDX. These composites were then employed as anode materials in LIBs, paired with a nickel manganese cobalt oxide (NMC) cathode. Electrochemical performance was assessed using a battery analyzer, and charge-discharge cycle (CDC) data were obtained. The addition of carbon significantly improved the electrochemical performance. Specifically, the composite with 100% SiO₂ showed a low capacity of 9.88 mAh/g, while those with 5% and 20% SiO₂ demonstrated significantly enhanced specific capacities of 97.35 mAh/g and 129.34 mAh/g, respectively, after five cycles.
Co-Authors -, Alfiana Adhitasari Adihartanto, Synbi Pasya Octaviarine Adisa, Farhan Agustin, Delliana Aji, Restu Alatif, Ikhsan Akmal Alfiana Adhitasari Amelia Nur Aliah Andrijanto, Eko Anggraini, Yuki Martha Aniqa Arjumand Bano Harvani Arijan Vevayose Tarigan Aulia, Bunga Azzahra, Nasya Azzahra, Rafila Chika Azzahra, Tarisha Aulia Bambang Soeswanto binti Jamaluddin, Jamarosliza Dianty Rosirda Dewi Kurnia Diningrat, Mangku Joyo Dwi Irmawati, Dwi Elizabeth, Lidya Endang Kusumawati Endang Kusumawati Fauzan, Rizky Fauziah, Najmi Febrian, Dea Tri Gamaliel Tanaka Hakim, Muhammad Hayyi Rahman Harianto, Dicky Hariyadi, Tri Herawati Budiastuti Heru Hermawan Hidayatulloh, Irwan Irianto, Indra Jayanti, Retno Dwi Kharisma, Luthfiana Khoirunisa, Tira Nur Lestari Herlianti Putri Luviana, Angely Malik, Dava Maulana Manfaati, Rintis Muhammad Misbahussalam Muhari, Emma Hermawati Mujahidah, Nisa Rahmah Mukhtar Ghozali Ngatin, Agustinus Nidaulhusna, Anisa Nirmala Utami Nugraha, Teguh Aditya Nurbaits, Alisya Nurcahyo, Nurcahyo Nurhasanah, Santy Nurul Annisa Nurulgina, Rahma Permatasari, Rahma Puspa Putri, Angelina Rachmawati, Anissa Nurul Rahma Ardelia Raissa Rahmawati, Sri Puji Ramadhan, Muhammad Zikri Ramadhani, Laily lsna Retno Indarti Reynaldi, Randi Rivaldo Rofie Fauzi Budiman Rizky Setianto Rizky, Rian Muhamad Robby Sudarman Rusdianasari Rusdianasari Sabinna Azahra Sulaeman Salsabila, Iva Najwa Salsabila, Salwa Ainaya Salsabila, Shafira Salsabilla, Iva Najwa Sari, Radianti Novita Setiawan, Kiranna Shalmadevy Setyaningrum, Sinta Shafira Yulianthina Sihombing, Rony Sihombing, Rony Pasonang Silvia Fatimatur Rahmawati Suminar, Dian Ratna Suryadi, Joko Teguh Aditya Nugraha Teguh Taufiqurohim Tika Paramitha Tika Paramitha Tri Hariyadi Tri Reksa Saputra Trirahayu, Dhyna Analyes Unung Leoanggraini Utami, Khoirunnisa Wardana Putra, Adzikri Yusuf, Yusmardhany Zahwa, Keisya Adellia