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All Journal Chemistry Indonesian Journal of Chemical Research
Sekewael, Serly J
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Biochemistry, Genetics & Molecular Biology Chemistry Engineering Environmental Science

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Kinetics and Isotherm Study of Ion Phosphate Adsorption by Lontor Natural Clay Ikhsan, Nurul; Sekewael, Serly J; Hasanela, Nurani
Indonesian Journal of Chemical Research Vol 9 No 3 (2022): Edition for January 2022
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2022.9-ikh

Abstract

The clay used taken from Lontor Village, Central Maluku Regency, Banda Besar Island. The clay was activated at 350 °C for 3 hours using a furnace. This study aims to determine the effectiveness of physically activated Lontor natural clay in reducing levels of phosphate ions using the adsorption method. The adsorption capacity of clay is determined based on two parameters. The parameters are the optimum contact time used are 2, 3, 4, 5, and 6 hours and variations of the concentration are 10, 20, 30, 40, and 50 mg/L of phosphate. The concentration of phosphate adsorbed on the clay was measured by a UV-Vis spectrophotometer at a wavelength of 665 nm. The results showed that the optimum conditions for the adsorption of phosphate ions by Lontor natural clay were obtained at the contact time of 5 hours and the concentration of 40 mg/L. The adsorption of phosphate ions by Lontor activated natural clay followed the pseudo-second-order Lagergren adsorption kinetics model with a rate constant value (k2) of 3.39 x 10-1 g mg-1 min-1, and following the Freundlich adsorption isotherm models with a correlation coefficient (R2), Freundlich constant (Kf), and n values, respectively are 0.9513; 0.57 mg1-1/n L1/n/g, and 0.40 g/L.
Synthesis And Characterization Of Silver Nanoparticles Using Gandaria (Bouea macrophylla Griff.) Seed Extract As Bioreductor And Ouw Natural Clay (ONC) As Matrix Kiat, Jaleha; Bijang, Catherina M; Sutapa, Wayan; Sekewael, Serly J
Indonesian Journal of Chemical Research Vol 12 No 2 (2024): Edition for September 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-jal

Abstract

The synthesis of silver nanoparticles (AgNP) was achieved by utilizing gandaria seed extract as a bioreductant and Ouw natural clay (ONC) as a matrix. An investigation was conducted on the volume of a silver nitrate solution with a concentration of 1 x 10-3 M, which served as a precursor. The silver nanoparticles were analyzed using UV-Vis spectroscopy to assess their surface plasmon resonance (SPR) and stability. The results indicate that the SPR of silver nanoparticles occurs at a wavelength range of 432-450 nm. X-ray diffraction (XRD) was also employed for characterization purposes to ascertain the existence of silver nanoparticles that were generated within the ONC matrix. The XRD characterization data indicate that the Ag/ONC nanocomposite achieved the maximum stability and nanoparticle content when a volume of 500 mL of AgNO3 0.1 M (S5) was added. The mean crystal size of the silver nanoparticles generated is 48.48 nm, with a crystal orientation of both BCC (Body-Centered Cubic) and FCC (Face-Centered Cubic).
Co-Authors Bijang, Catherina M Hasanela, Nurani Kiat, Jaleha Nurul Ikhsan Sutapa, Wayan