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All Journal Pascal: Journal of Physics and Science Learning SEARCH: Science Education Research
Yus Rama Denny
Universtas Sultan Ageng Tirtayasa
Education Physics Social Sciences Other

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Preliminary Evaluation of Alkali–Glycine Pretreatment for Base Metal Leaching from Waste Printed Circuit Boards (PCB) Agita Kaila Warohmah; Yus Rama Denny; Ganesha Antarnusa; Mochamad Reza Firdaus
SEARCH: Science Education Research Journal Vol. 4 No. 2 (2026): SEARCH: April 2026
Publisher : IAIN Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47945/search.v4i2.2962

Abstract

Waste printed circuit boards (PCB) have potential as a secondary source of valuable metals; however, the high content of base metals may hinder the recovery of precious metals, thereby requiring a pretreatment stage. This study aimed to conduct a preliminary evaluation of alkali–glycine pretreatment for base metal leaching from waste printed circuit boards. PCB samples were reduced to a particle size of <2 mm and separated into particle size fractions of −60 mesh and −120 mesh. The pretreatment stage was carried out under alkaline conditions, followed by glycine leaching using a glycine concentration of 30 g/L at pH 11, agitation speed of 300 rpm, and leaching time of 24 h under ambient conditions. Initial characterization was performed using X-Ray Fluorescence (XRF) and Inductively Coupled Plasma (ICP), while leaching filtrates were analyzed using Atomic Absorption Spectroscopy (AAS). The characterization results showed that Cu was the dominant metal with a concentration of 21.775 wt.%, while Au and Ag contents reached 522 ppm and 668 ppm, respectively. Leaching results indicated that Cu and Zn were dissolved in limited amounts, whereas Au was not detected in the filtrate. Cu recovery remained relatively low and showed no significant difference between particle sizes, indicating that particle size reduction under the applied conditions had limited influence on leaching performance. The findings suggest that alkali–glycine pretreatment has potential as an initial step for reducing base metal content prior to precious metal recovery, although further optimization of operating conditions is required to improve leaching efficiency.
KARAKTERISASI OPTIK EKSTRAK BUNGA TELANG (CLITORIA TERNATEA L.) PADA BERBAGAI TINGKAT PENGENCERAN SEBAGAI SENSITIZER ALAMI DSSC Nadia Astriyani; Yus Rama Denny; Yudi Guntara
Pascal: Journal of Physics and Science Learning Vol 10, No 1 (2026): JUNI
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/pascal.v10i1.13716

Abstract

Penelitian ini bertujuan menganalisis pengaruh variasi pengenceran ekstrak bunga telang (Clitoria ternatea L.) terhadap karakteristik absorbansi UV-Vis dan nilai optical band gap sebagai kandidat dye alami Dye-Sensitized Solar Cell (DSSC). Metode eksperimen laboratorium dilakukan melalui pembuatan empat variasi pengenceran, yaitu 1:5, 1:10, 1:15, dan 1:20 (v/v) dari hasil maserasi pelarut etanol 96% dan HCl 0,2%. Karakterisasi sampel menggunakan spektrofotometer UV-Vis pada rentang 400–700 nm, dilanjutkan analisis celah pita energi dengan metode Tauc Plot. Hasil penelitian menunjukkan seluruh sampel memiliki puncak absorbansi pada rentang 557–573 nm yang mengindikasikan keberadaan antosianin. Variasi 1:5 menghasilkan absorbansi tertinggi sebesar 2,9974, sedangkan pengenceran 1:10 menunjukkan kondisi optimum berdasarkan karakteristik absorbansi dan nilai optical band gap terendah sebesar 1,891 eV sehingga berpotensi sebagai kandidat sensitizer alami DSSC..
Co-Authors Agita Kaila Warohmah Antarnusa, Ganesha Mochamad Reza Firdaus Nadia Astriyani Yudi Guntara