Acid Modification of Diatomite-Based Sorbents

A. Nurgain; M. Nazhipkyzy; A. A. Zhaparova; A. T. Issanbekova; M. Alfe; A. S. Musina

doi:10.18321/ectj975

Authors

A. Nurgain Institute of Combustion Problems, 172 Bogenbay Batyr str., 050012, Almaty, Kazakhstan; al-Farabi Kazakh National University, 71 Al-Farabi ave., 050038, Almaty, Kazakhstan
M. Nazhipkyzy Institute of Combustion Problems, 172 Bogenbay Batyr str., 050012, Almaty, Kazakhstan; al-Farabi Kazakh National University, 71 Al-Farabi ave., 050038, Almaty, Kazakhstan
A. A. Zhaparova Institute of Combustion Problems, 172 Bogenbay Batyr str., 050012, Almaty, Kazakhstan
A. T. Issanbekova al-Farabi Kazakh National University, 71 Al-Farabi ave., 050038, Almaty, Kazakhstan
M. Alfe Istituto di Ricerche sulla Combustione-CNR, Napoli, Italy
A. S. Musina Kazakh State Women Teacher Training University, Almaty

DOI:

https://doi.org/10.18321/ectj975

Keywords:

diatomite, sorbent, acid pre-treatment, Pb sorption

Abstract

In this work, the effect of acid pre-treatment (hydrochloric acid, HCl) and calcination of diatomite, a silicon dioxide-material from natural sources, was studied with the aim to obtain diatomite-based sorbents with specific physicochemical properties. For this, acid pre-treatments with HCl at different calcination conditions, namely HCl concentration (0.5, 1 M) and calcination temperatures (from 600 to 900 °C) were studied. Morphological features different from those of natural diatomite were obtained. It has been found that treatment of diatomite with 0.5 M HCl at 800 °C showed a specific pore volume of 0.008 cm³/g, and a specific surface area of 19.26 m²/g, while the treatment of diatomite with 1.0 M HCl showed a specific pore volume of 0.011cm³/g, and a specific surface area of 25.57 m²/g. The performance of the acid pretreatment of diatomite for adsorption of Pb ions from water was also studied.

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