Article Per Year (5 Year)
p-Index From 2021 - 2026
1.633
P-Index
This Author published in this journals
All Journal Dinamik IPTEK The Journal for Technology and Science Jurnal Teknik Kimia Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya G-Tech : Jurnal Teknologi Terapan BERNAS: Jurnal Pengabdian Kepada Masyarakat Community Empowerment International Journal of Eco-Innovation in Science and Engineering (IJEISE) AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) AGRIEKSTENSIA
Raka Selaksa Charisma Muchammad
Department Of Chemical Engineering, Faculty Of Engineering And Science, Universitas Pembangunan Nasional Veteran Jawa Timur, Surabaya 60294, Indonesia
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Mechanical Engineering Neuroscience Nursing Public Health Social Sciences Veterinary Other

Published : 11 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 11 Documents
Search

 1   2 
Study of Extraction Calophyllum inophyllum L using Microwave Hydrodiffusion Gravity And Chemical Extraction method Raka Selaksa Charisma Muchammad; Mahfud Mahfud; Lailatul Qadariyah
IPTEK The Journal for Technology and Science Vol 31, No 1 (2020)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (652.483 KB) | DOI: 10.12962/j20882033.v31i1.5629

Abstract

In this study, the oil extraction of Calophyllum inophyllum L using microwave hydro-diffusion gravity method and chemical extraction method were elaborated. The Microwave Hydrodiffusion Gravity (MHG) method is a new green technique which combines microwave-assisted technology and gravitation. It is used to produce oil yield faster and at a low cost. In comparison, a chemical extraction method is a conventional method. The raw material pretreatment, extraction time, microwave power, and the material size have become a crucial factor of extraction. In general, the MHG method yields a higher yield than the chemical extraction method. The MHG method is simple and less solvent. It requires faster extraction time and produces higher oil yield.
Mini-Review on Renewable Production of Green p-Xylene Muchammad, Raka Selaksa Charisma; Saputro, Erwan Adi; Rohmah, Aisyah Alifatul Zahidah
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 2 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i2.135

Abstract

The sustainable and renewable production of p-xylene (PX), a crucial component for polyethylene terephthalate (PET), is increasingly important as an alternative to fossil-based processes. This review examines biomass-derived routes for PX synthesis, emphasizing the use of bio-px production pathways to feasible for commercialization. While bio-PX production offers reduced greenhouse gas emissions, challenges remain in cost, catalyst stability, and energy requirements. Recent innovations in catalyst regeneration and hierarchical structures enhance stability and minimize coke formation. Life-cycle assessments confirm bio-PX’s environmental advantages, suggesting that further research into biomass sources and catalyst efficiency will advance bio-based PX production toward commercial viability in a sustainable bioeconomy.
Evaluasi Kinerja Cooling Tower CT-2211A-B Unit Utilitas Produksi IA PT Petrokimia Gresik Muchammad, Raka Selaksa Charisma; Nurmawati, Ardika; Saputro, Erwan Adi; Juwana, Krishna Rahmad; Handy, Febry Widiatniko; Pinandita, Indrawan
Dinamik Vol 30 No 1 (2025)
Publisher : Universitas Stikubank

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35315/dinamik.v30i1.9885

Abstract

Setiap industri membutuhkan air pendingin (cooling water) sebagai unit pendukung dalam proses produksinya, termasuk industri petrokimia yang memerlukan air pendingin (cooling water) agar proses produksinya dapat berjalan dengan lancar. Untuk meningkatkan serta menjaga penggunaan air pendingin (cooling water) , maka digunakan alat cooling tower yang berfungsi untuk me-recycle air kondensat menjadi air pendingin (cooling water) kembali. Penggunaan alat cooling tower ini dinilai sangat penting, sehingga diperlukan analisa evaluasi kinerja alat untuk mengetahui kondisi cooling tower dan mencegah kerusakan dikemudian hari. Evaluasi tersebut berdasarkan nilai efisiensi kerja serta termal cooling tower dan perhitungan neraca massa pada sistem cooling tower CT-22111 A-B. Analisa evaluasi ini dapat menjadi hal yang di pertimbangan oleh teknis pihak industri untuk melakukan perawatan lebih lanjut serta operasional. Dari Analisa data lapangan serta data pendukung didapatkan hasil aktual yang menunjukkan di mana cooling tower pada unit utilitas departemen produksi IA diperoleh sebesar 71% untuk desain dan 77% untuk aktual serta untuk efisiensi termal masih direntang 67% - 81% tidak terlalu berbeda dengan data desain untuk efisiensi termal. Dengan demikian, kinerja cooling tower menunjukkan bahwa masih beroperasi dengan cukup baik.
Modernization of hydroponic farming using rice husk for community food security in Karang Langit, Lamongan Pujiastuti, Caecilia; Muchamad, Raka Selaksa Charisma; Rohmah, Aisyah Alifatul Zahidah; Chakim, M. Ghufron; Fajrin, Alifah Nur Aini; Rizal, Achmad; Azka, Salsabilla
Community Empowerment Vol 10 No 8 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ce.14476

Abstract

Rice husk waste is an abundant agricultural byproduct in Karang Langit Village, Lamongan, but its utilization is still limited, posing a potential environmental problem. This community service program aims to modernize agricultural practices by utilizing rice husk as a hydroponic growing medium to support food security and promote a circular economy. The methods applied include community coordination, carbonization of rice husks, preparation of the hydroponic system, and both theoretical and practical hands-on training. Evaluation results show a significant increase in participants’ knowledge by 32%. A total of 85% of participants successfully prepared a viable rice-husk-based growing medium, and 75% were able to cultivate and harvest leafy vegetables in the trial phase. Additionally, a farmer group was formed and is committed to independently continuing hydroponic practices after the program’s conclusion. These results confirm that utilizing rice husk as a hydroponic medium not only enhances community skills and self-sufficiency but also opens new economic opportunities. This model is recommended for replication in other agricultural areas to support local food security and environmental sustainability.
STUDY OF KINETIC MODELING FOR SEA WATER IMPURITIES REMOVAL (SO4) USING DISODIUM PHOSPHATE (NA2HPO4) AND CALCIUM CHLORIDE (CACL2) Pujiastuti, Caecilia; Rohmah, Aisyah Alifatul Zahidah; Muchammad, Raka Selaksa Charisma; Sumada, Ketut
Jurnal Teknik Kimia Vol 19, No 2 (2025)
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v19i2.5157

Abstract

Salt is an essential mineral for human life, typically containing NaCl along with various impurities such as Mg²⁺, SO₄²⁻, and K⁺. The production of industrial-grade salt can be achieved through chemical treatments to bind these impurities. This study aims to investigate the kinetics of Sulphate (SO4) precipitation in order to lower impurities concentrations in seawater (Mg²⁺, SO₄²⁻, and K⁺), which is used as raw material for salt production, by adding chemical agents disodium phosphate (Na₂HPO₄) and calcium chloride (CaCl₂), each at a concentration of 2N. The research was conducted using continuous stirred tank technology with a stirring speed of 100 rpm and a solution pH of 9. The kinetics of impurity reduction in seawater were simulated using mathematical formulations, specifically pseudo-first-order and pseudo-second-order models. The results indicated that the process achieved the best outcomes with the addition of SO₄ solution, resulting in the highest removal value of 757.86 mg/L compared to others. Additionally, this correlated with an R² value close to 1 for the second-order kinetics, specifically 0.9871.
Effect of Fermentation Time and Lactobacillus plantarum Inoculum Concentration on Lactic Acid Production from Durian Peel Waste Nanda Yunita Pratiwi; Shintya Hotnauli Turnip; Sani Sani; Raka Selaksa Charisma Muchammad; Aisyah Alifatul Zahidah Rohmah; Suprihatin Suprihatin
G-Tech: Jurnal Teknologi Terapan Vol 10 No 2 (2026): G-Tech, Vol. 10 No. 2 April 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i2.9425

Abstract

Lactic acid is an important chemical whose demand continues to increase every year. Therefore, alternative innovations are needed to meet this demand. One potential raw material that can be utilized is durian peel waste, which is high in cellulose and can be converted into reducing sugar through pretreatment and hydrolysis as a fermentation substrate to produce lactic acid. This study aims to determine the optimal conditions for fermentation time (5 hours; 6.5 hours; 8 hours; 9.5 hours and 11 hours) and Lactobacillus Plantarum inoculum concentration (5%, 10%, 15%, 20%, 25%) in producing high concentrations of lactic acid. The research was conducted through Alkali Hydrogen Peroxide (AHP) delignification, acid hydrolysis, and fermentation processes. The lactic acid content was analyzed using the acid-base titration method (Total Titratable Acidity). The results showed that the highest lactic acid content was obtained at a fermentation time of 11 hours with an inoculum concentration of 20%, which reached 0.135%. Thus, fermentation time and inoculum concentration affect the lactic acid content produced, and durian peel waste has the potential to be used as an alternative raw material in lactic acid production.
OPTIMIZATION OF VALUABLE MINERALS (MG2+ & K⁺) RECOVERY FROM SEAWATER USING RESPONSE SURFACE METHODOLOGY (RSM) Raka Selaksa Charisma Muchammad; Aisyah Alifatul Zahidah Rohmah; Caecilia Pudjiastuti; Alifah Nur Aini Fajrin; Ketut Sumada
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.v7i2.6284

Abstract

The extraction of metallic ions from seawater brine within a circular economy framework presents economic promise yet is hampered by concomitant ionic interference manifested during the precipitation of salts. The present investigation sought to characterize and subsequently to refine the co-precipitation steps for magnesium and potassium ions such that they yield suitable precursors for the synthesis of struvite fertilizer. The experimental work utilized a Response Surface Methodology built upon a Face-Centered Central Composite Design, interrogating the influence of the molar ratio of sodium hydrogen phosphate to calcium chloride and the duration of reaction on the simultaneous recovery of Mg²⁺ and K⁺. Results from the Analysis of Variance demonstrated that the principal effects of the aforementioned ratio, reaction duration, and their interaction terms were statistically significant for both target recoveries. By iterative optimization, the experimental framework predicted optimal operational parameters of sodium hydrogen phosphate to calcium chloride ratio of 0.401 and a reaction interval of 11.608 minutes, corresponding to a composite desirability statistic of 0.908 and estimated recoveries of 93.979 % and 97.300 % for magnesium and potassium ions, respectively. The data therefore substantiate the conclusion that Response Surface Methodology provides a systematic and analytically tractable conduit for the resolution of equilibrated brine mixtures, delineating a refined process envelope that promotes the extraction and economic valorization of essential mineral fertilizers from industrial saline streams.
Teknologi dalam Rantai Pasok Agribisnis: Analisis Bibliometrik tentang Perannya dalam Meningkatkan Ketahanan Pangan Annisa Vira Widayanti; Raka Selaksa Charisma Muchammad; Akbar Hariputra; Aditya Arief Rachmadhan
Agriekstensia : Jurnal Penelitian Terapan Bidang Pertanian Vol. 24 No. 1 (2025): AGRIEKSTENSIA: Jurnal Penelitian Terapan Bidang Pertanian
Publisher : Politeknik Pembangunan Pertanian Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34145/agriekstensia.v24i1.3738

Abstract

Climate change, global disruptions, and unequal food distribution have made food security a critical and urgent global issue. In response, digital technologies offer strategic opportunities to enhance the efficiency, transparency, and resilience of agribusiness supply chains. However, existing research remains fragmented, often lacking thematic integration and a global perspective on how digital innovations contribute to food security. This study aims to systematically map the global research landscape through a bibliometric analysis of 100 Scopus-indexed articles published between 2019 and 2025, focusing on the intersection of digital technology, agribusiness, and food security. Using VOSviewer, five major thematic clusters are identified: blockchain and traceability, digital supply chain platforms, artificial intelligence, sustainability transformation, and data-driven agribusiness. The findings show that technologies such as blockchain, IoT, and AI play a vital role in supporting food system availability, accessibility, and stability. Emerging topics such as circular economy and digital inclusion reflect a shift toward more sustainable and equitable digital food systems. This study not only synthesizes existing academic discourse but also provides strategic insights for future research, policy design, and inclusive technological adoption—particularly in developing regions. As such, it serves as an essential foundation for designing systemic, inclusive, and sustainable digital transformation in agrifood systems to address the urgent challenge of global food security.
Alkali Hydrogen Peroxide (AHP) Pretreatment to Increase The Cellulose Content In Durian Peel Waste Nur Makhmudi; Tri Utami Setyawati; Sani Sani; Aisyah Alifatul Zahidah Rohmah; Raka Selaksa Charisma Muchammad
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.9675

Abstract

Indonesia is one of the largest producers of durian, generating substantial quantities of durian peel waste. Due to its high cellulose content, durian peel has strong potential as a lignocellulosic feedstock for reducing sugar and biofuel production. However, the presence of lignin and hemicellulose limits cellulose accessibility and inhibits hydrolysis. This study investigated Alkali Hydrogen Peroxide (AHP) pretreatment to enhance cellulose purity in durian peel waste. Pretreatment was carried out using H₂O₂ concentrations of 0.5–8.5% (w/v) with NaOH adjustment to pH 11–12 at 70°C for 3 h. The optimum condition was obtained at 8.5% H₂O₂, which increased cellulose content from 63.02% to 75.05%, reduced hemicellulose by 24.4%, and removed 99.5% of lignin. Scanning Electron Microscopy (SEM) analysis confirmed the formation of a rougher and more porous surface after pretreatment, indicating disruption of the lignocellulosic structure. Statistical analysis using ANOVA showed that H₂O₂ concentration significantly affected cellulose, hemicellulose, and lignin responses (p < 0.05). These results demonstrate that AHP pretreatment is highly effective in improving cellulose accessibility and provides a promising approach for converting durian peel waste into reducing sugars and other bio-based products.
Green Calcium Ammonium Phosphate (CAP) Fertilizer Synthesis from Red Mussel Shells (Anadara granosa): An Optimization Study Using Response Surface Methodology Raka Selaksa Charisma Muchammad; Ketut Sumada
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 10 No. 3 (2026)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v10i3.1006

Abstract

This study investigates the synthesis of Green Calcium Ammonium Phosphate (CAP) fertilizer utilizing red mussel shells (Anadara granosa) as a biogenic precursor. Response Surface Methodology (RSM) was employed to optimize process variables, identifying an optimal operating window at pH 8.000 and a feed-to-phosphoric acid ratio of 0.100 (w/v). Under these conditions, the model predicted a Phosphorus concentration of 25.647%, Calcium content of 71.861%, and a Yield of 77.621 (desirability: 0.628). However, ANOVA diagnostics revealed a significant Lack of Fit, suggesting that standard quadratic models are sensitive to latent physicochemical parameters inherent in the biogenic matrix. These statistical discrepancies indicate that while successful at the laboratory scale, current predictive frameworks require kinetic refinement prior to large-scale industrial implementation. Contribution to Sustainable Development Goals (SDGs):SDG 2: Zero HungerSDG 12: Responsible Consumption and ProductionSDG 13: Climate Action
Co-Authors Achmad Rizal Aditya Arief Rachmadhan Afidah Vanmugi Isnayanti Aisyah Alifatul Zahidah Rohmah Akbar Hariputra Alifah Nur Aini Fajrin Anggi Durrotul Fauziyah Annisa Vira Widayanti Ardika Nurmawati, Ardika Azka, Salsabilla Caecilia Pudjiastuti Erwan Adi Saputro Falya Riswanti Awalia Handy, Febry Widiatniko Juwana, Krishna Rahmad Ketut Sumada Ketut Sumada Lailatul Qadariyah M. Ghufron Chakim Mahfud Mahfud Muhammad Fauzan Satyasyauqi satyasyauqi Nanda Yunita Pratiwi Nur Makhmudi Pinandita, Indrawan Pujiastuti, Caecilia Pujiastuti, Caecilia R. Rama Satria Novartha Sani Sani Sani Sani Shintya Hotnauli Turnip Suprihatin Suprihatin Tri Utami Setyawati