RESEARCH ON THE ION EXCHANGE PROPERTIES IN HYDROCHLORIC ACID-MODIFIED ZEOLITE FOR WATER TREATMENT

Yerlan Doszhanov; Mudasir Zahid; Noorahmad Ahmadi; Rahmuddin Ihsas; Almagul  Kerimkulova; Ospan Doszhanov; Arman Zhumazhanov; Nurbike Baizakova; Dana Akhmetzhanova; Karina Saurykova; Akbope Aidarbek

doi:10.54668/2789-6323-2025-118-3-78-87

Authors

Yerlan Doszhanov The Institute of Combustion Problems, Al-Farabi Kazakh National University https://orcid.org/0000-0002-3454-8889
Mudasir Zahid Paktika University https://orcid.org/0009-0004-8846-1609
Noorahmad Ahmadi Nuristan University https://orcid.org/0009-0009-4809-1769
Rahmuddin Ihsas Sayed Jamaluddin Afghani University https://orcid.org/0009-0009-4809-1769
Almagul Kerimkulova Institute of Combustion Problems https://orcid.org/0000-0001-8048-4970
Ospan Doszhanov Almaty Technological University https://orcid.org/0000-0003-2292-8742
Arman Zhumazhanov Institute of Combustion Problems, al-farabi KazNU https://orcid.org/0009-0004-6256-9814
Nurbike Baizakova Al-Farabi Kazakh National University https://orcid.org/0009-0000-2244-8162
Dana Akhmetzhanova The Institute of Combustion Problems, Al-Farabi Kazakh National University https://orcid.org/0000-0003-3670-9460
Karina Saurykova The Institute of Combustion Problems https://orcid.org/0000-0002-0417-0379
Akbope Aidarbek The Institute of Combustion Problems https://orcid.org/0009-0003-6189-7835

DOI:

https://doi.org/10.54668/2789-6323-2025-118-3-78-87

Keywords:

acid treatment, zeolite modification, adsorption, wastewater treatment, pore structure, clinoptilolite

Abstract

Zeolite is a group of a few microporous, crystalline aluminosilicate materials which has attracted much attention due to its remarkable absorption, ion exchange, and catalytic behavior. Their uses in water treatment, particularly for heavy metal and ammonium ion removal, have been greatly augmented through chemical modifications. This study investigates the impact of HCl treatment on the physicochemical and structural properties of natural clinoptilolite zeolite. First, it was refluxed with 0.97 M HCl for acid modification and was extensively purified, characterized using FTIR, XRD, gas sorption, and DTG. Overall, compared with the raw material, the results clearly show that the treatment with HCl can increase the surface area and cation exchange capacity, and improve the pore distribution by removing impurities and reorganization of the aluminosilicate building unit. Gas sorption confirmed a 64.4 % increase in the BET surface area (280.3 m²/g), along with a decrease in pore diameter, indicating enhanced adsorption efficiency. Adsorption experiments also indicated that most of the HCl-treated zeolites outperformed the unmodified samples for Disperse Blue 26 (DB 26). Furthermore, although acid modification often improves adsorption characteristics, the research indicates the possibility of structural stability issues stemming from framework leaching. The results of this study revealed the potential of HCl-modified zeolites as efficient and environmentally friendly adsorption materials for water treatment, including wastewater.

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RESEARCH ON THE ION EXCHANGE PROPERTIES IN HYDROCHLORIC ACID-MODIFIED ZEOLITE FOR WATER TREATMENT

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