High Performance of Al-MCM-41 in Tetracycline Adsorption Using a Fixed-Bed Column
Henrique B. Gomes, José A. Giusti Zacharias, Laura P. Tovar, Sarah I. P. M. N. Alves, Luís A. M. Ruotolo, Romilda Fernandez-Felisbino
TL;DR
Al-MCM-41 effectively removes tetracycline from water in both batch and continuous systems, showing promise for sustainable water treatment.
Contribution
Demonstrates the practical applicability of Al-MCM-41 in continuous-flow systems for removing tetracycline.
Findings
Al-MCM-41 achieved a maximum adsorption capacity of 82.74 mg g–1 in batch experiments.
Fixed-bed column experiments showed an adsorption capacity of 19.1 mg g–1 using the Yan model for breakthrough curves.
The adsorption process was found to be spontaneous and exothermic, indicating combined physisorption and weak chemisorption.
Abstract
This study investigates the adsorption efficacy of aluminum-modified mesoporous silica (Al-MCM-41, Si/Al = 16.1) for the removal of tetracycline (TC) from aqueous solutions, employing both batch and fixed-bed column systems in the quest for sustainable solutions to eliminate emerging contaminants. The synthesized material exhibited a highly ordered hexagonal structure and high surface area (∼850 m2 g–1), confirmed by X-ray diffraction, nitrogen physisorption, FTIR, and transmission electron microscopy analyses. Batch adsorption kinetics followed a pseudo-second-order model, indicating surface-controlled uptake, while isotherm data fit both Langmuir and Freundlich models, with a maximum adsorption capacity of 82.74 mg g–1. Thermodynamic analysis revealed a spontaneous and exothermic process (ΔH° = −25.8 kJ mol–1), suggesting combined physisorption and weak chemisorption. In fixed-bed…
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Taxonomy
TopicsAdsorption and biosorption for pollutant removal · Mesoporous Materials and Catalysis · Carbon Dioxide Capture Technologies