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KARAKTERISASI SIFAT KEMAGNETAN PASIR BESI PANTAI PUNTARU KABUPATEN ALOR-NTT Martasiana Karbeka; Faryda Veronica Lamma Koly; Nini Mau Tellu
Lantanida Journal Vol 8, No 2 (2020)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v8i2.7867

Iron sand is a source of natural magnetic material which is quite abundant. Iron sand can be useful as a magnetic source material which has the potential as a raw material for using magnetic materials. Iron sand contains non magnetic minerals which can reduce its magnetic properties. Therefore, iron sand sample preparation was carried out by washing NaOH 0,4 M and sand sample size variations. The purpose of this study was to determine the effect of washing and the size of iron sand on the magnetic properties in terms of the increase in magnetic elements. The results of research with XRF (X-Ray Fluoresence) show that iron sand with a size of 120 mesh has a magnetic content of Fe (78.07%) higher than iron sand with a size of 80 mesh with Fe content (34.63%). XRD (X-Ray Diffraction) analysis shows that washing iron sand with a size of 80 mesh gives a quarts phase (SiO2) at 2θ = 27.62° and iron sand washing with a size of 120 mesh gives the main peak magnetite phase (Fe3O4) at 2θ = 30.69° with a crystallinity of 15%. VSM (Vibrating Sample Magnetometer) analysis depicted on the hysteresis curve shows that the smaller the particle size of iron sand, the higher the magnetic properties. There are still minor oxides in iron sand as oxide minerals.

KAJIAN KINETIKA ADSORPSI LOGAM TIMBAL (Pb) OLEH ADSORBEN PASIR TERAKTIVASI NAOH DENGAN VARIASI KONSENTRASI Karbeka, Martasiana
Lantanida Journal Vol 12, No 1 (2024)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v12i1.20530

In this research, a study of the adsorption kinetics of heavy metal Pb(II) with white sand adsorbent has been carried out. The use of white sand as an adsorbent is based on the habits of the people who use white sand to purify water. For wider use, in this study, it was used to adsorb lead metal which has a high toxicity. Increased the adsorption power of white sand, chemical activation was carried out using NaOH with various concentrations of 2, 4 and 6 M. Adsorption kinetics of Pb(II) by adsorbents were carried out using a batch system with time variations of 15, 30, 60, 90, 120 minutes. The behavior pattern of Pb(II) absorption by the adsorbent was studied using first-order, second-order kinetic models, pseudo-first-order Lagergren's equation and pseudo-second-order Ho's equation. The results showed that the absorption of Pb(II) by sand adsorbents in various variations, both control and activated NaOH 2, 4 and 6 M, followed a pseudo-second-order adsorption kinetics with a coefficient of determination (R2) of 1. In addition, based on kinetic studies pseudo second order there is no value comparison between qe, exp and qe, hit. The highest k value was found in the 4 M NaOH activated sand adsorbent, which was 206.921 g/mg.h, indicating a faster absorption rate of the adsorbate by the adsorbent. Thus, the activation of the adsorbent at variations in base concentration affects the surface area of the adsorbent where the greater the surface area, the faster the absorption rate of Pb(II).

SINTESIS PUPUK LEPAS LAMBAT BERBASIS KITOSAN-BIOCHAR-UREA SEBAGAI MATERIAL POTENSIAL PELEPASAN NITROGEN Karbeka, Martasiana; Mautuka, Zakarias Adrianto; Lily, Diana Oktovina Tung
Lantanida Journal Vol 12, No 2 (2024)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v12i2.26190

The fabrication of slow-release urea fertilizer beads using chitosan and chitosan-biochar as coating materials has been accomplished. The beads were synthesized by solidifying chitosan-urea and chitosan-biochar-urea hydrogels in a NaOH solution. Characterization of the chitosan-urea composite beads (BKU) and chitosan-biochar-urea beads (BKBU) was conducted through Fourier-transform infrared (FTIR) spectroscopy, along with water intake (swelling) and nitrogen release tests in aqueous media at time intervals of 24, 72, 120, and 168 hours. The FTIR spectra of BKU and BKBU beads displayed functional group peaks associated with biochar (hydroxyl and carboxylate), chitosan (amine and hydroxyl), and urea (amine and carbonyl), along with others supporting group. Water intake rates were 72% for BKU and 81% for BKBU, which impacted nitrogen release patterns. BKU exhibited a faster nitrogen release compared to BKBU, indicating that BKBU is more suitable for use as a slow-release fertilizer due to its more gradual nitrogen release mechanism

KAJIAN KINETIKA ADSORPSI LOGAM TIMBAL (Pb) OLEH ADSORBEN PASIR TERAKTIVASI NAOH DENGAN VARIASI KONSENTRASI Karbeka, Martasiana
Lantanida Journal Vol 12 No 1 (2024)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v12i1.20530

In this research, a study of the adsorption kinetics of heavy metal Pb(II) with white sand adsorbent has been carried out. The use of white sand as an adsorbent is based on the habits of the people who use white sand to purify water. For wider use, in this study, it was used to adsorb lead metal which has a high toxicity. Increased the adsorption power of white sand, chemical activation was carried out using NaOH with various concentrations of 2, 4 and 6 M. Adsorption kinetics of Pb(II) by adsorbents were carried out using a batch system with time variations of 15, 30, 60, 90, 120 minutes. The behavior pattern of Pb(II) absorption by the adsorbent was studied using first-order, second-order kinetic models, pseudo-first-order Lagergren's equation and pseudo-second-order Ho's equation. The results showed that the absorption of Pb(II) by sand adsorbents in various variations, both control and activated NaOH 2, 4 and 6 M, followed a pseudo-second-order adsorption kinetics with a coefficient of determination (R2) of 1. In addition, based on kinetic studies pseudo second order there is no value comparison between qe, exp and qe, hit. The highest k value was found in the 4 M NaOH activated sand adsorbent, which was 206.921 g/mg.h, indicating a faster absorption rate of the adsorbate by the adsorbent. Thus, the activation of the adsorbent at variations in base concentration affects the surface area of the adsorbent where the greater the surface area, the faster the absorption rate of Pb(II).

SINTESIS PUPUK LEPAS LAMBAT BERBASIS KITOSAN-BIOCHAR-UREA SEBAGAI MATERIAL POTENSIAL PELEPASAN NITROGEN Karbeka, Martasiana; Mautuka, Zakarias Adrianto; Lily, Diana Oktovina Tung
Lantanida Journal Vol 12 No 2 (2024)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v12i2.26190

The fabrication of slow-release urea fertilizer beads using chitosan and chitosan-biochar as coating materials has been accomplished. The beads were synthesized by solidifying chitosan-urea and chitosan-biochar-urea hydrogels in a NaOH solution. Characterization of the chitosan-urea composite beads (BKU) and chitosan-biochar-urea beads (BKBU) was conducted through Fourier-transform infrared (FTIR) spectroscopy, along with water intake (swelling) and nitrogen release tests in aqueous media at time intervals of 24, 72, 120, and 168 hours. The FTIR spectra of BKU and BKBU beads displayed functional group peaks associated with biochar (hydroxyl and carboxylate), chitosan (amine and hydroxyl), and urea (amine and carbonyl), along with others supporting group. Water intake rates were 72% for BKU and 81% for BKBU, which impacted nitrogen release patterns. BKU exhibited a faster nitrogen release compared to BKBU, indicating that BKBU is more suitable for use as a slow-release fertilizer due to its more gradual nitrogen release mechanism

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