Particle Characteristics of Diatomite Activated by Alkaline Solution

Theara Yann; Charinee Winotapun; Phanny Yos; Lee Hwei Voon; Orathai Boondamnoen

doi:10.4028/p-D4JwE2

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HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 155Particle Characteristics of Diatomite Activated by...

Particle Characteristics of Diatomite Activated by Alkaline Solution

Abstract:

In this study, the activation of natural diatomite was done with alkaline solution. The diatomite powder was sieved and purified prior to activation at room temperature (Alk-DA RT) and 85 °C (Alk-DA 85 °C). The effect of activation time of Alk-DA 85 °C samples was observed for 1 h, 2 h and 5 h. At temperature interval from room temperature to 530 °C, the weight loss for all of Alk-DA are less than R-DA. The reduction of particle aggregation was found in Alk-DA at both RT and 85 °C as shown in SEM images, indicating the activation by NaOH that effectively breaks down the bulky structure. The formation of silanol group (Si-OH) were obtained on the surface of Alk-DA. However, BET result revealed there is no increment of surface area and porosity in case of RT. In addition, Alk-DA 85 °C samples at 1 h and 2 h provided the spongy surfaces with obvious improvement of surface area, and reduction in porosity and pore size. In contrast, Alk-DA 85 °C 5 h showed more cluster of particle aggregation. Moreover, it can be observed that Alk-DA 85 °C 1 h is the most interesting for further study since it potentially provides high gas adsorption but only requires a shorter activation time.

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Periodical:

Advances in Science and Technology (Volume 155)

Pages:

37-43

DOI:

https://doi.org/10.4028/p-D4JwE2

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Online since:

September 2024

Authors:

Theara Yann, Charinee Winotapun, Phanny Yos, Lee Hwei Voon, Orathai Boondamnoen*

Keywords:

Adsorption, Alkaline Activated, Diatomite, Porous, Surface Area

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