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All Journal International Journal of Advances in Applied Sciences Journal of Physics: Theories and Applications
Venty Suryanti
Sebelas Maret University
Earth & Planetary Sciences Education Environmental Science Materials Science & Nanotechnology Mathematics Physics

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Absorption Spectra Comparison of Tm/Ho-Codoped Bototellurite Glasses Azmi Saraswati; Ahmad Marzuki; Venty Suryanti
Journal of Physics: Theories and Applications Vol 5, No 2 (2021): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v5i2.53809

Abstract

This paper presents a comparison study of absorption spectra of borotellurite glasses with compostion: 20TeO2 – 15Bi2O3 – 3TiO2 – (4-x) Na2CO3 – 1Tm2O3 - xHo2O3 where x = 0; 0.5; 1; 1.5; 2; 2.5 (mol%). All glasses are fabricated using melt quenching method. Absorption spectra were recorded at room temperature in the spectral range of 200 – 1100 nm. Within this range, glass with x = 0 mol % of Ho2O3 shows 2 absorption peaks which corresponds to electronics transition from 3H6 to state to 3F3 and 3H4.   For x = 0.5; 1; 1.5; 2; 2.5 (mol%), nine absorption peaks corresponding to electronics transition from 3H6 to state to 5G5, 5G6, 1G4, 1G4, 5F3, 5F4, 5F5, 3F3, and 3H4 are shown. It is shown that absorption at 680 nm and 790 are insensitive to the addition of Ho2O3 in contrast to that at 580 nm and 650 nm.
Andisol and microcrystalline cellulose from Typha angustifolia for auramine O adsorption Pranoto Pranoto; Venty Suryanti; Robi'atul Adawiyah
International Journal of Advances in Applied Sciences Vol 12, No 1: March 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v12.i1.pp27-36

Abstract

Andisol has a large surface area, is mesoporous, and contains the active groups' silanol (Si-OH) and aluminol (Al-OH). Besides andisol, cellulose is a good adsorbent, because microcrystalline cellulose has an active hydroxyl group (OH). The number of active adsorbent groups can be enhanced by chemically modifying the surface area (increment), or adding other materials. These modifications included alkaline modified-andisol with the addition of NaOH to increase pore size, cellulose hydrolysis with HCl to increase surface area, and andisol modification with the inclusion of other materials, mainly cellulose, to increase surface area. After the adsorption process is complete, the adsorption capacity of andisol-microcrystalline cellulose (AMS) to auramine O (AO) is known. As an adsorbent for AO, the surface area of BET andisol is 25.92 m2/g and the pore diameter is 14.40 nm, while the surface area of microcrystalline cellulose and AMS adsorbent are 26.60 m2/g and 18.60 m2/g, respectively. The maximum AO adsorption conditions by AMS were at pH 7, optimum at a contact time of 5 minutes, and maximum at a concentration of 40 mg/L with an adsorbent ratio of 1:1. The adsorption kinetics and isotherm more closely followed the pseudo second-order and Langmuir isotherm with an adsorption capacity of 5.24 mg/g.
Co-Authors Ahmad Marzuki Azmi Saraswati Pranoto Pranoto Robi'atul Adawiyah