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Lumban Raja, Saur
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Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology

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Improving Porosity of Glycerol-plated Silica from Rice Husk Silica Lumban Raja, Saur
Journal of Chemical Natural Resources Vol. 1 No. 2 (2019): Journal of Chemical Natural Resources
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (960.836 KB) | DOI: 10.32734/jcnar.v1i2.1257

Abstract

Research on the increasing pore size of rice husk silica with the addition of glycerol as a template has been done. Sodium silicate obtained from rice husk can be extracted with sodium hydroxide. The resulting sodium silicate is then added to the glycerol and followed by precipitation using hydrochloric acid to obtain silica. The obtained results were calcined at 600°C. The resulting material analised by FT-IR, XRD and BET. The FT-IR data shows an asymmetric Si-O-Si absorption peak at wave number 1067 cm-1 and a symmetrical Si-O-Si peak absorption at 806.77 cm-1 wave number. Diffractogram XRD also shows a widening peak in the area of 22.820 that the silica is amorphous. The result of adsorption of nitrogen desorption of silica isotherm indicated Type IV isotherm adsorption which was characteristic of mesoporous material and obtained the size distribution of 9.2 nm and the pore volume was 0.002850 cc / g and the surface area of silica was 80.38 m2/g
Fabrication of Synthetic Zeolite from Sinabung Mountain Volcanic Ash via Sol-Gel Method Lumban Raja, Saur; Simatupang, Eka Bonita
Journal of Chemical Natural Resources Vol. 4 No. 2 (2022): Journal of Chemical Natural Resources
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jcnar.v4i2.11968

Abstract

Fabrication of synthetic zeolite from Sinabung Mountain volcanic ash by Sol-Gel method. The zeolite is obtained by extraction of alkalis sodium silicate and sodium aluminate. At first volcanic ash was characterized using XRF and XRD analyses. The XRF analysis shows that silica is 44.8%. In contrast, XRD analysis showed a sharp peak at a 2Ѳ corner area of 27.55o to express bonded with silica mineral salt. At the same time, the silica characterization is done by FT-IR analysis. The FT-IR analysis shows the presence of Si-O-Si groups at wave numbers 1064.71 cm-1, 786.96 cm-1 and Si-OH at wave 3749.62 cm-1 and 3448.72 cm-1, identifying the presence of silica. The synthetic zeolite characterization analysis obtained is FT-IR, XRD, SEM-EDX, and BET analysis. In the FT-IR analysis, the O-Si-O group was obtained at wave 987,85 cm-1 and O-Al-O at wave 447,89-585,30 cm-1, identifying X zeolite. Diffractogram XRD showed a sharp peak at 66.8°, 28.12°, and 45.84°, forming mixed crystalline X and zeolite A. SEM-EDX analysis shows that zeolite morphology is tight and homogeneous and has a high aluminium content of 24.79 and Si 16.12. While for nitrogen desorption, adsorption analysis on pore size, surface area and pore volume are 3,22 nm, 61,86 m2/g and 0,095 cc/g. The result of synthetic zeolite isotherm adsorption-desorption shows type V showing mesoporous size.
Isolation of Sillica from Pantai Cermin Sand and Modification with Sodium Lauryl Sulfate and Ligan Ethylendyamine Through Coating Method as Absorption of Pb Metal Lumban Raja, Saur; Lubis, Simon Putra
Journal of Chemical Natural Resources Vol. 5 No. 2 (2023): Journal of Chemical Natural Resources
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jcnar.v5i2.13785

Abstract

Research on the formation of synthesis and modification coating of silica and obtained silica with a quartz structure used to absorb lead metal ions. This isolation was performed by extracting silica from sand with the co-precipitation method using NaOH 7M and then adding HCl 2M. The resulting silica was coated with sodium lauryl sulfate and ethylenediamine to increase adsorption. The FT-IR spectrum on silica shows the presence of Si-O-Si, Si-O-, Si-OH, S–O, SO3, CH2, and NH—Sillica coating, which sodium lauryl sulfate and ethylenediamine ligands were carried out by coating method at pH 2. The results obtained before and after coating on silica were characterized by FT-IR, XRD, and SEM EDX analysis. The FT-IR spectrum on sillica showed the presence of Si-O-Si, Si-O, and Si-OH functional groups. After the coating, there was a change in the spectrum, indicating new functional groups in the S-O, SO3, CH2, and NH spectra. Characterization using XRD shows the diffraction peaks were of 2𝛳 27,6297°, which indicates the amorph. After coating, the diffraction peaks appeared at an angle of 2𝛳 in the area of 19.62 °, 20.47°, 21.04 °, 25.56 °, 26.50 °, and 29.73 ° with a high enough intensity indicating increased crystallinity. The morphology, composition, and size of the silica produced before and after coating were observed by SEM-EDX. Where there is a change in the size before and after a modification, that is 100,788 nm to 85,3773 nm. Silica before and after coating is used as an adsorbent to reduce levels of heavy metal lead (Pb). This analysis showed that the adsorption of Pb²⁺ with silica was 4,5162 ppm, while the adsorption of Pb²⁺ after coating was 1,1146 ppm.
Effect of Chitosan Addition on Porosity of Rice Husk Calcium Silicate Used for Free Fatty Acid Adsorbent from Palm Oil Lumban Raja, Saur; Butarbutar, Olwin
Journal of Chemical Natural Resources Vol. 6 No. 1 (2024): Journal of Chemical Natural Resources
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jcnar.v6i1.16222

Abstract

Studies have been done on developing calcium silicate pores derived from rice husk with and without including chitosan as a template. The chitosan solution was supplemented with sodium silicate derived from rice husk, and then CaCl2 was added. The calcium silicate was calcinated at 900ºC for 4 h. The calcium silicate obtained was characterized using X-ray diffraction (XRD), fourier transform infrared (FT-IR), and Brunauer-Emmett-Teller (BET)  analysis. The XRD analysis showed the presence of diffraction peaks corresponding to Wollastonite (CaSiO3) crystals, Wollastonite 2m (CaSiO3), Alite (Ca3SiO5), and larnite (Ca2SiO4). Next, the FT-IR spectrum exhibits Si-O-Si, Si-O-Ca, and Si-OH functional groups, suggesting the presence of calcium silicate material. The BET study of calcium silicate using chitosan templates revealed a pore size of 3.88 nm, a pore volume of 0.1577 cc/g, and a surface area of 81.1519 m2/g. The BET analysis results obtained differed from those of the BET analysis of calcium silicate conducted without using chitosan templates, which were 2.06 nm, 0.069 cc/g, and 13.531 m2/g, respectively. The developed mesoporous calcium silicate was employed as an adsorbent to decrease the concentrations of free fatty acids in palm oil. The acid-base titration method is used to evaluate quantities of free fatty acids. The results obtained from the computation of free fatty acid levels indicate a decline in the concentration of free fatty acids in palm oil. The concentration of free fatty acids derived from palm oil was 1.23%. Therefore, mesoporous calcium silicate-free fatty acids at a concentration of 1.06% resulted in an 86.1% reduction.
Utilization of Mesoporous Silica from Rice Husk to Reduce Copper Level in Water Using Adsorption Method Lumban Raja, Saur; Sipayung, Elisabet Maret; Nainggolan, Hamonangan
Journal of Chemical Natural Resources Vol. 6 No. 2 (2024): Journal of Chemical Natural Resources
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jcnar.v6i2.18849

Abstract

Conducted research on the utilization of mesoporous silica derived from rice husks for copper reduction using adsorption methods. This work aims to evaluate the efficacy of copper adsorption with mesoporous silica derived from rice husk, calcined at a temperature of 900 °C. Mesoporous silica possesses a pore diameter ranging from 5 to 17 nm. The approach employed to decrease copper is the adsorption method. Identifying the optimal settings entails an adsorbent mass of approximately 0.2 g, 0.4 g, 0.6 g, 0.8 g, and 1.0 g an adsorbate concentration of 10 mg/l, and a contact duration of 60 minutes. The adsorption technique involves contacting mesoporous silica with a copper solution in an Erlenmeyer flask, followed by stirring with a magnetic stirrer utilizing varying masses of mesoporous silica. The results indicated that a substantial adsorption occurs with the utilization of 1.6 g of mesoporous silica, achieving a copper adsorption percentage of 99.73%. The quantity of adsorbed copper ions is determined by the difference in metal concentration before and after adsorption, evaluated using Atomic Absorption Spectroscopy (AAS).
Co-Authors Butarbutar, Olwin Hamonangan Nainggolan, Hamonangan Lubis, Simon Putra Simatupang, Eka Bonita Sipayung, Elisabet Maret