| Issue |
BIO Web Conf.
Volume 226, 2026
The 5th International Seminar on Science and Technology (ISSTEC 2025)
|
|
|---|---|---|
| Article Number | 02007 | |
| Number of page(s) | 8 | |
| Section | Innovation in Chemical Sciences | |
| DOI | https://doi.org/10.1051/bioconf/202622602007 | |
| Published online | 06 March 2026 | |
Synthesis of Mg/Al–NO3 hydrotalcite immobilized by citric acid for [AuCl4]– adsorption
1 Universitas Gadjah Mada, Department of Chemistry, 55281 Yogyakarta, Special Region of Yogyakarta, Indonesia
2 IAIN Tulungagung, Department of Chemistry Education, 66221 Tulungagung, East Java, Indonesia
* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract
Synthesis of Mg/Al–NO3 hydrotalcite immobilized by citric acid (Mg/Al–NO3 HT–Cit) was synthesized for [AuCl4]– adsorption. The Mg/Al–NO3 HT–Cit was prepared by co-precipitation method. Optimum condition for the synthesis was studied by determining the optimum acidity and concentration of precursors. Application of adsorbent for [AuCl4]– adsorption was studied by determining their kinetics model. The results showed that the optimum acidity for Mg/Al–NO3 HT–Cit preparation was pH 7. The XRD diffractogram showed that synthesis of Mg/Al–NO3 HT– Cit was successfully immobilized onto the surface of hydrotalcite with basal spacing d(003) was 7.99 Å. Adsorption of [AuCl4]– was optimum at pH 3. Isotherm analysis revealed the adsorption of [AuCl4]– is best fitted by Langmuir model with qmax value of 126.58 mg g⁻¹.
© The Authors, published by EDP Sciences, 2026
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