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All Journal Eksakta : Berkala Ilmiah Bidang MIPA Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Scientific Contributions Oil and Gas
Ilham Ardatul Putra
Universitas Riau
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering

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The Determination of Cation Exchange Capacity of Napa Soil in 50 Kota Regency using Atomic Absorption Spectrophotometer Mawardi Mawardi; Fadhlurrahman Mawardi; Illyas Md Isa; Sunyono Sunyono; Hary Sanjaya; Ilham Ardatul Putra; Vira Nilmania; Irfan Ananda Ismail
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 02 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol23-iss02/314

Abstract

This research discuss about the cation exchange capacity of napa soil by using an atomic absorption spectrophotometer. The results is a value of the cation exchange capacity (CEC) and to review the differences of napa soil value and its influence on early treatment in the form of purification and treatment by using barium chloride method. According to the research that has been done, obtained  the optimum concentration of BaCl2 is 0.15 M and 0.15 M for MgSO4. Determination of CEC in optimum condition showed that napa soil that has been purified have higher CEC value, CEC value of napa soil in Situjuah Limo Nagari District is 1.7 meq/g and CEC value of napa soil in Sarilamak District is 1.2 meq/g. A fresh napa soil relatively has low value than napa soil that has been purified, the CEC value of  napa soil in Situjuah Limo Nagari District and Sarilamak District are 0.93 meq/g and 1.03 meq/g. While napa soil which has been given treatment with peroxide showed that CEC value declined sharply, the CEC value of napa soil in Situjuah Limo Nagari District and Sarilamak District which has been given treatment with peroxide are 0.3 meq/g and 0.7 meq/g.
Green Surfactant: Synthesis of Sulfonate Surfactants Using Strecker Modification Techniques and Surfactant Formulation for Chemical Enhanced Oil Recovery (Ceor) Applications Ilham ardatul putra; Yudha Taufantri; Yani F. Alli; Dadan Damayandri; Yohanes B.D. Wangge; Didin Mujahidin
Scientific Contributions Oil and Gas Vol 48 No 2 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i2.1779

Abstract

Despite the continuing development of sustainable sources of energy, crude oil and natural gas resources remain crucial elements of the international economy. With global petroleum and liquid fuel demand continually increasing, improving the efficiency of extraction from existing natural reserves of petroleum is of utmost importance as the world gradually transitions away from fossil fuels toward more sustainable sources. Toward that end, enhanced oil recovery (EOR) techniques have been developed and are used to minimize the amount of crude oil and petroleum that is left behind in underground reservoirs from conventional drilling extraction methods. In this study, surfactants were synthesized using a fatty acid derived from palm oil as a hydrophobic group and sulfonat as a hydrophilic group. The use of vegetable oil as the raw material is likely due to its abundance and environmentally friendly. Sulfonation of anionic surfactant was performed by utilizing the Strecker modification technique in which an alkali metal bisulfite (versus sulfite) is used to sulfonate the epoxide group. The preferred sulfonating reagent is a mixture of sodium bisulphite and sodium sulfite (1:1; 1:2; 1:2.5) as well as various time reactions. Product surfactant was characterized by thin-layer chromatography (TLC) to determine the optimum condition and reaction conversion. The molecular structure of surfactant was confirmed by 1H NMR. Nonionic surfactant was then analyzed by measuring the interfacial tension (IFT) of oil and water, wettability, and imbibition test. The results showed that the optimum conditions to obtain the hight convertion were achieved by reacting oleil glisidil ether and Sodium Sulfite-Bisulfit at an equivalent mole ratio of 1: 2 and 21 hours’ reaction time. Oleil Glisidil Eter Sulfonat surfactant was able to decrease the IFT of oil and water as 10-2 dyne/cm in brine salinity condition of 18000 ppm and oil 34,39 OAPI. This study also formulated surfactants OGES and OGEP so that the IFT was up to 10-3 and the recovery factor from the imbibition test was up to 75% Rf. The results were then used to design the synthesis of vegetable surfactant oil with various carbon chain lengths and functional groups as an EOR surfactant hydrophobic group.
Polymer-Oxygen Scavenger for Oil Recovery in Sandstone Jati, Dhika Permana; Hetharia, Putri Diantha; Damayandri, Dadan; Widyaningsih, Ratna; Kaesti, Edgie Yuda; Taufantri, Yudha; Putra, Ilham Ardatul
Scientific Contributions Oil and Gas Vol 49 No 1 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i1.1854

Abstract

Polymer degradation caused by dissolved oxygen remains a major challenge in Enhanced Oil Recovery (EOR) for sandstone reservoirs, especially under moderate salinity (18,000 ppm) and temperature (60°C) conditions, which accelerate viscosity loss. While HPAM polymers are highly effective, ensuring their long-term stability requires strategies that preserve molecular integrity throughout the injection process. This study employs laboratory experiments to assess two HPAM variants (FP 3630 and FP 3230), both in conventional formulations and with an oxygen scavenger (NaHSO₃), using Bentheimer synthetic cores. Evaluations cover fluid-to-fluid (compatibility, rheology, filtration, thermal stability) and fluid-to-rock (injectivity, core flooding) performance under reservoir conditions. Results identify FP 3630 at 1400 ppm with 0.1% NaHSO₃ as the optimal formulation. The oxygen scavenger significantly improves thermal stability and reduces viscosity degradation from 32.83% to 4.24%. This formulation achieves an ideal Resistance Factor (11.44) and causes minimal formation damage (RRF 1.01), while enhancing the Recovery Factor from 67.38% to 87.29%. These findings confirm that the incorporation of oxygen scavengers effectively minimizes polymer degradation and establishes them as a crucial component for the successful implementation of EOR in moderate-salinity sandstone reservoirs.
A COMPREHENSIVE REVIEW OF VACCINE ADJUVANTS: CURRENT APPLICATIONS, DEVELOPMENT, AND IN SILICO DESIGN Nikmatia Herfena; Eka Gunarti Ningsih; Widya Tania Artha; Ilham Ardatul Putra; Nur Afriana
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 2 (2025): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v7i2.5994

Abstract

Adjuvants play a crucial role in modern vaccine formulations by enhancing immune responses, prolonging protection, and reducing the required antigen dose. Although several adjuvants have been globally licensed, the development of novel adjuvants still faces major challenges such as unpredictable immunogenicity, potential toxicity, and high in vivo testing costs. In silico approaches offer promising solutions for accelerating adjuvant design and validation in a more efficient and targeted manner. This review summarizes recent advances in computational methods for adjuvant development, including epitope prediction, molecular docking, molecular dynamics simulation, and the application of artificial intelligence. It also discusses currently licensed adjuvants and highlights case studies involving in silico-designed immune-receptor agonists such as Toll-like-receptor (TLR) ligands. Integrating empirical and bioinformatic strategies is expected to create new opportunities for developing safer, more specific, and personalized vaccine adjuvants. Key challenges and future research directions are also identified to optimize the incorporation of in silico approaches into global vaccine innovation.
Co-Authors Dadan Damayandri Damayandri, Dadan Didin Mujahidin Edgie Yuda Kaesti Eka Gunarti Ningsih Fadhlurrahman Mawardi Hary Sanjaya Herfena, Nikmatia Hetharia, Putri Diantha Illyas Md Isa Irfan Ananda Ismail Jati, Dhika Permana Mawardi Mawardi Nur Afriana Sunyono Sunyono Vira Nilmania Widya Tania Artha Widyaningsih, Ratna Yani F. Alli Yohanes B.D. Wangge Yudha Taufantri Yudha Taufantri, Yudha