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Mumtaz

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Author-ID : 8371382

Humanities Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Social Sciences

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1

An Enhanced Nickel Recovery from Mixed Hydroxide Precipitate Through Selective Leaching with KMnO4 Oxidant Gumelar, Muhammad Dikdik; Rahayu; Saputra; Agustanhakri; Husin; Andrameda; Taqwatomo; Putra; Indrijarso; Saudi; Indriasari; Arfiana; Yuliani; Mumtaz; Mirahati
Jurnal Sains Materi Indonesia Vol. 26 No. 1 (2024): Jurnal Sains dan Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2024.3136

Mixed Hydroxide Precipitate (MHP), a metal precipitate with the dominant nickel and cobalt content in hydroxide compounds, can be leached as a lithium battery precursor. In this study, KMnO4 was used as an oxidant agent to increase the solubility of Ni and Co. The variation of the sulfuric acid concentration (0.5 - 1.5 M) as a leachate reagent, the concentration of KMnO4 (2.5 - 7.5 g/L), and the selective leaching temperature (60 - 80°C) were investigated. Solvent extraction using CYANEX 272 and D2EHPA was performed to separate the Ni, Co, and Mn. Atomic Absorption Spectrometry (AAS), Inductively coupled plasma mass (ICP-OES), and X-ray Fluorescence (XRF) were used to analyze the chemical compositions. At the same time, crystallographic analysis was observed with X-Ray Diffraction. It was observed that potassium permanganate increased the dissolution of Ni and Co to 91.3% and 85.4% but decreased the dissolution of Mn (37.53%) under the following conditions: 1.75 M sulfuric acid, 7.5 g/L potassium permanganate, and 60°C temperature. High purity of nickel crystal (99.64%) was observed with spontaneous nucleation due to the supersaturated nickel solution after solvent extraction with CYANEX 272. Thus, using permanganate ion as selective leaching of Ni and Co from Mn is promising.

EDUKASI HUKUM: SOSIALISASI TINDAK PIDANA TERHADAP MARTABAT PRESIDEN DAN/ATAU WAKIL PRESIDEN DALAM UU NO 1 TAHUN 2023 TENTANG KITAB UNDANG-UNDANG HUKUM PIDANA Mumtaz; Ariany, Lisda; Rahayu, Karlina; Handayani, Nuri; Fadillah; Riadi, Teguh; Tri Wibowo, Yuda
Asawika : Media Sosialisasi Abdimas Widya Karya Vol 10 No 03 (2025): Desember: Asawika
Publisher : LPPM Unika Widya Karya Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37832/asawika.v10i03.364

Undang-Undang Nomor 1 Tahun 2023 tentang Kitab Undang-Undang Hukum Pidana (KUHP) merupakan tonggak penting dalam pembaruan hukum pidana Indonesia, khususnya terkait ketentuan mengenai tindak pidana terhadap martabat Presiden dan/atau Wakil Presiden. Pasal-pasal tersebut bertujuan memberikan perlindungan hukum terhadap simbol negara, sekaligus menegaskan batasan agar kebebasan berpendapat tetap terjamin. Artikel ini membahas pelaksanaan sosialisasi hukum di Desa Pematang Gajah, Kecamatan Jambi Luar Kota, Kabupaten Muaro Jambi, sebagai upaya edukasi kepada masyarakat mengenai substansi pasal-pasal tersebut. Metode pelaksanaan pengabdian dilakukan melalui ceramah interaktif, diskusi, tanya jawab, serta pembagian bahan bacaan sederhana. Hasil kegiatan menunjukkan adanya peningkatan pemahaman masyarakat mengenai perbedaan antara kritik yang sah dengan tindakan yang dapat dipidana, serta tumbuhnya kesadaran hukum untuk menggunakan hak kebebasan berpendapat secara bijak. Kegiatan ini menegaskan pentingnya edukasi hukum di tingkat desa guna membangun masyarakat yang sadar hukum, kritis, dan bertanggung jawab dalam kehidupan demokratis.

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