Improvement of the Sorption Characteristics of Diatomite by Heat Treatment

Abstract

In this paper, the adsorption of Orange Bezaktiv (SRL-150), onto Diatomite treated at 100°C (Dt-100) and at 300°C (Dt-300) was investigated in aqueous solution. The crystalline phases and surface study of Dt-100 and Dt-300 was investigated using respectively XRD, SEM, FTIR, and BET. The effect of operational parameters such as pH, contact time and, initial dye concentration was studied. From the obtained results there is not drastic difference in the crystalline phases between the obtained materials Dt-100 and Dt-300. The treatment at 300°C increases slightly the specific surface area from 11.09 to 16.12 m2/g, and pores volume. The results of adsorption tests show, that the most suitable pH and equilibrium time were respectively 2 and 30 min, at an adsorbent dosage of 2 g/L. The kinetic studies revealed that the adsorption results fitted very well with pseudo-second order model (R2 = 0.99 for both adsorbents). Adsorption isotherms results were in accordance with Freundlich.

Fabrication of ceramic monoliths from diatomaceous earth: effects of calcination temperature on silica phase transformation

“…The band at 1039 cm -1 associated by the shoulder at 1100 cm -1 is attributed to the Si-O-Si stretching vibration [52]. The band at 796 cm -1 band is related to the OH translational vibration and Si-O-Si bending vibrations within the framework [52][53]. The dolomite presence in the DE is mapped by the band at 722 cm -1 from the v 4 (CO 3 2-) vibration [54], whereas the bands at 694 and 745 cm -1 are due to the clay minerals in the sample [55].…”

“…The band at 1637 cm -1 occurs from the H-O-H bending vibrations of adsorbed water in the phyllosilicate (sheet silicate) minerals as well as from the H 2 O present in opal-A. The band at 1039 cm -1 associated by the shoulder at 1100 cm -1 is attributed to the Si-O-Si stretching vibration [52]. The band at 796 cm -1 band is related to the OH translational vibration and Si-O-Si bending vibrations within the framework [52][53].…”

“…One way to improve the properties of DE is through the sintering process. During the sintering process, the impurities are removed followed by mineralogical changes that results in the enhancement on the characteristics of diatomite [45][46][47][48][49][50][51][52][53].…”

Using Activated Diatomite as Adsorbent for Treatment of Arsenic Contaminated Water

“…Diatomaceous earth (DE) is used in many industrial fields: wastewater treatment, filtering, petroleum processing, cleaning product manufacture, manufacture of fire or heat resistant materials and additives for building materials, etc. [1][2][3][4][5][6][7][8][9]. DE has been applied as adsorbent, ion exchanger, catalyst, and catalyst support for diverse chemical reactions as well as for environmental treatment [1][2]8].…”

“…[1][2][3][4][5][6][7][8][9]. DE has been applied as adsorbent, ion exchanger, catalyst, and catalyst support for diverse chemical reactions as well as for environmental treatment [1][2]8]. Vietnam is one of the countries that have large DE reserves.…”