Tannic acid is known as one of the refractory organic pollutants in water. Amino-functionalized magnetic
nanoadsorbent (Fe3O4@SiO2-NH2) exhibited high adsorption capacity for aqueous TA with maximum
adsorption amount of 136.23 mg/g at 25 °C. TA adsorption on the adsorbent could be well described by
Langmuir adsorption model and the adsorption process was endothermic. Furthermore, pseudo-second
adsorption kinetics can fit TA adsorption data very well, and the adsorption rate decreased with increasing
initial TA concentration. The presence of Na+, K+, and Ca2+ may result in enhanced TA adsorption. In addition,
TA adsorption over the adsorbent was highly dependent on solution pH and the maximum adsorption amount
was found to be at pH 6.0. The XPS analysis revealed that TA adsorption over the adsorbent may be attributed
to the surface complexation between the amino groups of the adsorbent and TA in solution. The TA loaded
adsorbent can be effectively desorbed in a 0.5 M HCl solution, and the regenerated adsorbent can be recycled
Tannic acid is known as one of the refractory organic pollutants in water. Amino-functionalized magneticnanoadsorbent (Fe3O4@SiO2-NH2) exhibited high adsorption capacity for aqueous TA with maximumadsorption amount of 136.23 mg/g at 25 °C. TA adsorption on the adsorbent could be well described byLangmuir adsorption model and the adsorption process was endothermic. Furthermore, pseudo-secondadsorption kinetics can fit TA adsorption data very well, and the adsorption rate decreased with increasinginitial TA concentration. The presence of Na+, K+, and Ca2+ may result in enhanced TA adsorption. In addition,TA adsorption over the adsorbent was highly dependent on solution pH and the maximum adsorption amountwas found to be at pH 6.0. The XPS analysis revealed that TA adsorption over the adsorbent may be attributedto the surface complexation between the amino groups of the adsorbent and TA in solution. The TA loadedadsorbent can be effectively desorbed in a 0.5 M HCl solution, and the regenerated adsorbent can be recycled
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