Synthesis and Characterization of Silica Obtained by Combined Acid–Alkali Treatment of Serpentinite
Auyeshov A. Arynov K. Yeskibayeva C. Ibrayeva A. Dzholdasova E.
October 2025Multidisciplinary Digital Publishing Institute (MDPI)
Molecules
2025#30Issue 20
Serpentinite rocks and their processing waste represent a valuable source of magnesium and silicon; however, their complex composition complicates the efficient recovery of individual components. This study investigates the combined acid–alkali processing of serpentinite waste from the Zhitikara deposit (Kazakhstan). In the acid leaching stage, sulfuric acid enables magnesium extraction, while subsequent treatment with sodium hydroxide (NaOH) facilitates the selective recovery of silica gel formed during acid attack. At the final neutralization step, amorphous silica is precipitated with a yield exceeding 60% of its initial content. The obtained silica was characterized using FTIR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), inductively coupled plasma mass spectrometry (ICP-MS, Thermo iCAP-Q), and nitrogen adsorption measurements via the BET method. It was established that the synthesized silica gel, according to the IUPAC classification, belongs to mesoporous materials, possesses a well-developed specific surface area (400 m2·g−1), and is suitable for adsorption and catalytic applications.
acid–alkali processing , amorphous silica , industrial waste utilization , magnesium hydrosilicates , serpentinite
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Scientific Research Laboratory “Applied Chemistry”, M. Auezov South Kazakhstan University, Tauke-Khan St. 5, Shymkent, 160012, Kazakhstan
LLP “Institute of Innovative Research and Technology”, 8th Microdistrict, Building 28, Apt. 2, Almaty, 050010, Kazakhstan
Scientific Research Laboratory “Applied Chemistry”
LLP “Institute of Innovative Research and Technology”
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