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All Journal MASALIQ: Jurnal Pendidikan dan Sains Jurnal Pendidikan Kimia, Fisika dan Biologi
Putri Nugraha
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Religion Education Social Sciences

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Adsorpsi Ion Logam Cr (VI) dari Adsorben Karbon Aktif Tongkol Jagung (Zea Mays) Khalisa Khalisa; Fahilatul Syukro; Nuzulia Yona; Putri Nugraha; Edi Nasra; Desy Kurniawati
Jurnal Pendidikan Kimia, Fisika dan Biologi Vol. 1 No. 4 (2025): Juli: Jurnal Pendidikan Kimia, Fisika dan Biologi
Publisher : Asosiasi Riset Ilmu Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/jupenkifb.v2i4.323

Abstract

The use of Cr (Chromium) in industry and daily life produces toxic waste harmful to humans and the environment. This study aims to evaluate the effectiveness of activated carbon from corn cobs as an adsorbent for Cr(VI) heavy metal. Corn cobs, which contain 40–44% cellulose, were carbonized at 500°C using 6% sodium carbonate and characterized with an IR spectrophotometer. Adsorption tests were conducted by varying pH and contact time to determine optimal conditions. FTIR results revealed functional groups such as C≡C stretch, C=C=C stretch, and C–O bend. After activation, O–H groups appeared, indicating the presence of aromatic compounds, which are typical in activated carbon. The optimum pH for Cr(VI) adsorption was pH 4, with an adsorption rate of 65.35%. The optimum contact time was 60 minutes, resulting in 3.2% Cr(VI) adsorbed and a maximum adsorption capacity of 0.089 mg/g. In conclusion, corn cobs are a promising, eco-friendly, and effective natural material for adsorbing Cr(VI) heavy metal ions.
Pengaruh pH dan Konsentrasi terhadap Adsorpsi Ion Logam Cr³⁺ menggunakan Silika Xerogel dari Abu Terbang Putri Nugraha; Edi Nasra
MASALIQ Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i4.6319

Abstract

Fly ash, a byproduct of coal combustion produced continuously, poses significant environmental risks if not utilized effectively. Its high silica content presents potential for conversion into silica xerogel, which can function as an adsorbent for heavy metal ions such as Cr³⁺. This study aims to analyze the SiO₂ content in synthesized silica xerogel using X-Ray Fluorescence (XRF) analysis and to determine its optimum adsorption capacity based on variations in pH and Cr³⁺ ion concentration. Optimization was carried out at varying pH levels (2–6) and concentrations (100–300 ppm). XRF analysis revealed that the SiO₂ content in fly ash pretreated with 3M HCl was 54.167%, while the synthesized silica xerogel exhibited an increased SiO₂ content of 69.09%, with a %yield of 54.825%, indicating a relatively high silica purity. Adsorption tests showed maximum adsorption capacity at pH 4 and a Cr³⁺ concentration of 200 ppm, reaching 26.76 mg/g. The adsorption isotherm followed the Langmuir model with a determination coefficient of R² = 0.9509, indicating a strong fit between the model and the experimental data. These findings suggest that silica xerogel derived from fly ash holds promise as an effective adsorbent for heavy metal wastewater treatment. Keywords: Fly Ash; Adsorption; Silica Xerogel; Cr³⁺ Metal Ion; Langmuir Isotherm
Co-Authors DESY KURNIAWATI Edi Nasra Fahilatul Syukro Khalisa Khalisa Nuzulia Yona