Adsorptive recovery of Au3+ from aqueous solutions using bayberry tannin-immobilized mesoporous silica

Recovery of gold(III) from an aqueous solution onto a durio zibethinus husk

“…Comparing the correlation coefficient values (R 2 ), it was observed that the Langmuir isotherm model was more suitable for the experimental data than was the Freundlich isotherm at all temperatures studied. This data suggests that the adsorption of Au(III) on DZH occurs as a monolayer coverage during the chelating interaction [25]. A similar result was reported for adsorption of Au(III) on eggshell membrane [26].…”

Tannin-based biosorbents for environmental applications – A review

“…Mesoporous silica was also proposed in literature as a supporting matrix for tannins immobilization [48,49]. Silica was chosen since it shows excellent swelling resistance in different solvents and a good mechanical, thermal and chemical stability, and, according to the authors, improves the adsorption kinetics, considering its mesoporous structure [49].…”

“…Silica was chosen since it shows excellent swelling resistance in different solvents and a good mechanical, thermal and chemical stability, and, according to the authors, improves the adsorption kinetics, considering its mesoporous structure [49]. Of note, the silica beads had to be aminated prior to tannin immobilization, i.e.…”

The Role of Carboxyl and Hydroxyl Groups of Humic Acid in Removing AuCl₄^- from Aqueous Solution

“…Consequently, an additional phenomenon must be responsible for this change in medium acidity. Many studies have revealed that AuCl4 -can be reduced to Au metal by the phenolic -OH groups on tannin [40][41] and alcoholic -OH groups on cellulose [40], sugar beet pulp [42] and algal polysaccharides [43]. Kuyucak and Volesky [44] have suggested that this reductive conversion by -OH (phenolic and alcoholic -OH) groups proceeds according to equation (2):…”