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All Journal Makara Journal of Science Sewagati Environmental and Materials
Pramadewandaru, Respati Kevin
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Arts Humanities Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Energy Engineering Languange, Linguistic, Communication & Media Physics Public Health Social Sciences Other

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Preparation of β-Ni (OH)2 Nanosheet–Modified Glassy Carbon for Pseudocapacitors Putra, Muhammad Buchari Setia; Aliyah, Aliyah; Sanjaya, Afiten Rahmin; Pramadewandaru, Respati Kevin; Chung, Hoeil; Ivandini, Tribidasari Anggraningrum
Makara Journal of Science Vol. 28, No. 2
Publisher : UI Scholars Hub

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Abstract

β-Nickel hydroxide (Ni(OH)2) nanosheet–modified glassy carbon for pseudocapacitors was successfully prepared. The nanosheets were synthesized via a conventional growth seeding method combined with hydrothermal treatment. Transmission electron microscopy (TEM) characterization indicated the hexagonal structure of the nanosheets of around 15 nm in size, and X-ray diffraction (XRD) pattern confirmed the β-phase lattice crystal. These nanosheets used to modify the glassy carbon surface, increased the electroactive surface area by around 15 times. Furthermore, electrochemical investigation of the modified glassy carbon revealed an excellent performance and a specific capacitance of 628.01 F g−1 at a 1 A g−1 current density. Moreover, an outstanding stability was demonstrated, with 89.9% retention of the capacitance observed after 3000 cycles at a 1 A g−1 current density.
Pemanfaatan Limbah Cangkang Kerang untuk Produksi Pupuk Organik Cair: Studi Kasus Desa Mojoasem, Sidayu, Gresik Ananda, Muhammad Bagas; Rasyida, Amaliya; Pintowantoro, Sungging; Setiyorini, Yuli; Pradesar, Yusuf; Pramadewandaru, Respati Kevin
Sewagati Vol 9 No 2 (2025)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v9i2.2508

Abstract

Pengelolaan limbah perikanan, khususnya limbah cangkang kerang, merupakan tantangan lingkungan yang signifikan di Mojoasem, Sidayu, Gresik. Pengabdian masyarakat ini bertujuan untuk memberikan pelatihan dan inisiasi pembentukan startup untuk memproses limbah tersebut menjadi pupuk organik cair (POC) guna meningkatkan partisipasi masyarakat dalam pengelolaan sampah organik. Metode yang diterapkan meliputi sosialisasi mengenai dampak lingkungan limbah perikanan, pelatihan proses fermentasi limbah menggunakan bioaktivator alami seperti EM4 dan molase, serta praktik langsung produksi POC. Masyarakat menunjukkan partisipasi aktif dengan antusias bertanya dan berdiskusi terkait proses produksi dan potensi pemasaran POC. Signifikansi dari hasil ini adalah potensi pengurangan limbah organik serta peningkatan pendapatan masyarakat melalui produk lokal. Proyek ini berpotensi memberikan solusi berkelanjutan untuk masalah limbah organik sekaligus memperkuat ekonomi desa Mojoasem.
An acetylcholinesterase-based biosensor of carbofuran using carbon foam electrode modified by graphene and gold particles Pramadewandaru, Respati Kevin; Triani, Sulis; Tesla, Yudhistira; Sanjaya, Afiten Rahmin
Environmental and Materials Vol. 3 No. 1: (June) 2025
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/eam.v3i1.2025.1963

Abstract

Background: This study introduces a novel acetylcholinesterase (AChE)-based biosensor for the sensitive and selective detection of carbofuran, a widely used carbamate pesticide known for its neurotoxicity. Methods: The biosensor employs a carbon foam (CF) electrode modified with graphene oxide and gold nanoparticles (CF/Graphene/Au), leveraging the synergistic properties of these materials to enhance electrochemical performance. Carbofuran detection is achieved through its inhibitory effect on AChE activity, monitored via cyclic voltammetry of thiocholine oxidation. Findings: Under optimal conditions at pH 7.4, the biosensor demonstrated a linear detection range of 25–125 μM, a detection limit of 8.08 μM, and a sensitivity of 0.3874 mA μM⁻¹ cm⁻². It also showed strong reproducibility with a relative standard deviation of 6.77%. When tested on real vegetable samples, the biosensor achieved recovery rates between 88.95% and 111.30%. Conclusion: Compared to existing biosensor technologies, the CF/Graphene/Au-based sensor offers a well-balanced performance in terms of sensitivity, detection range, and practical usability. It presents a viable and portable solution for monitoring pesticide residues in environmental samples. Novelty/Originality of this article:  This work presents a promising, portable solution for environmental monitoring of pesticide residues, integrating advanced nanomaterials and computational validation to improve detection accuracy and reliability.
Co-Authors Aliyah, Aliyah Ananda, Muhammad Bagas Chung, Hoeil Ivandini Tribidasari Anggraningrum Pradesar, Yusuf Putra, Muhammad Buchari Setia Rasyida, Amaliya Sanjaya, Afiten Rahmin Sungging Pintowantoro Tesla, Yudhistira Triani, Sulis Yuli Setiyorini