Direct Synthesis of Sodalite from Kaolin: The Influence of Alkalinity

Abstract

Alkalinity is one of the most important factors that influence the crystallization process of zeolite and the product properties. The influence of alkalinity on the synthesis of sodalite from kaolin without calcinations was reported in this research. The synthesis of sodalite using molar ratio of Na2O/Al2O3 = x, H2O/Na2O = 128/x and SiO2/Al2O3 = 2/x, where x was the variation of molar ratio of alkalinity: 10, 20, 30, and 40. The synthesis has done by stirring for 6 h, without aging, and the crystallization time was 24 h under hydrothermal method (100 °C). The products were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX). The X-ray diffraction pattern and infrared spectroscopy shown that pure sodalite was formed by using molar ratio of alkalinity 10, 20, and 30. The crystallinity and particle size increase along with increasing of alkalinity. Quartz was formed by using molar ratio of alkalinity 40.

Synthesis of Sodalite from Sepiolite by Alkali Fusion Method and Its Application to Remove Fe3+, Cr3+, and Cd2+ from Aqueous Solutions

“…Accordingly, sodalite can be synthesized in the presence of low to medium amount of NaOH powder, 7.32-7.72g in the fused reaction gel, at 100-220°C. This can reveal the influence of alkaline environment in zeolite formation and alkalinity of the reaction medium was proven to be an important parameter affecting the synthesis of sodalite (Sari et al, 2018). Meanwhile, from the theoretical point of view, higher alkalinity condition, there would be a high concentration of OHin the experimental environment.…”

“…The six membered rings define a series of tunnels whose intersections lead to formation of large cavities which are occupied by chloride ions coordinated with sodium ions (Rabiller et al, 2004). This mineral has drawn scientists' attention to focus on its potential applications such as optical material (Arieli et al, 2004), adsorption and ion exchange (Mirfendereski & Mohammadi, 2011), catalyst support (Ogura et al, 2008) arisen from small pore sizes and high ion exchange capacity (Sari et al, 2018). Accordingly, numerous studies have been widely performed on the synthesis of this microporous zeolite.…”

“…Accordingly, numerous studies have been widely performed on the synthesis of this microporous zeolite. Scientists (Sari et al, 2018), investigated direct synthesis of sodalite from kaolinite. In this study, the synthesis was done by stirring for 6 hours, without aging, and crystallization time was 24 hours under hydrothermal method (100 °C).…”

Hydrothermal Synthesis and Characterization of Zeolite A from Corn (Zea Mays) Stover Ash

“…As shown in Figure 3, the XRD pattern of the corn stover ash confirmed the presence of characteristic peaks of calcite (CaCO 3 ), cristobalite high (SiO 2 ), and quartz (SiO Generally, the vibration of a particular configuration of chemical bonding is associ- Generally, the vibration of a particular configuration of chemical bonding is associated with its absorption bands. Published data from various studies [18,26,35,36,71,72] were used as a guide to interpret corn stover ash's spectra. As expected, the corn stover's FT-IR spectra revealed a comparable series of absorption bands; the main composition of the sample was oxide of Si.…”

Adsorpsi Pb2+ menggunakan Sodalit dari Kaolin Bangka Belitung

“…berat semakin banyak dengan meningkatnya berbagai macam aktivitas manusia, seperti aktivitas laboratorium [2], penggunaan accu, aktivitas industri, dan lain-lain. Ukuran partikel juga tidak beraturan dan besar, yaitu sekitar 1-150µm (Sari, 2018).…”