article · ACS Omega
Modified silica nanotubes functionalised with 3-APTES, designated as 3-APTES@MSNT, offer an effective nanoadsorbent material for removing tetracycline from aquatic environments. Structural characterisation reveals that the material possesses abundant surface functional groups, an effective pore size distribution, a large pore volume, and a relatively high surface area. Evaluation across various operational factors confirms that ambient temperature, ionic strength, initial tetracycline concentration, contact time, pH, coexisting ions, and adsorbent dosage influence uptake performance. The adsorption process fits the Langmuir isotherm and pseudo-second-order kinetic models, operating as an endothermic reaction driven by electrostatic forces, hydrogen bonding, and pore-filling mechanisms. Crucially, the nanoadsorbent retains a high level of recyclability, exceeding 84.6 percent performance through five operational cycles, demonstrating its functional stability for environmental remediation tasks involving antibiotic contaminants.
Pharmaceutical residues such as tetracycline present severe environmental and public health risks when released into aquatic ecosystems. Developing stable, high-capacity adsorbents that can be reused over multiple cycles helps reduce the cost and waste associated with water purification. This material provides an efficient mechanism to capture persistent antibiotic pollutants and supports cleaner wastewater management.
The material targets water treatment facilities, environmental remediation services, and industrial effluent management operators seeking to strip antibiotic contaminants from wastewater. Given that the findings are based on laboratory batch testing and mechanistic characterisation, the technology represents early-stage materials research. Further scale-up, continuous-flow evaluation, and cost-benefit assessments against commercial adsorbents would be required before real-world deployment.
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adsorption-desorption isotherms. The later analysis suggested that the 3-APTES@MSNT nanoadsorbent has abundant surface functional groups, effective pore size distribution, a larger pore volume, and a relatively higher surface area. Furthermore, the influence of key adsorption parameters, including ambient temperature, ionic strength, initial TC concentration, contact time, initial pH, coexisting ions, and adsorbent dosage, had also been investigated. The 3-APTES@MSNT nanoadsorbent's ability to adsorb the TC molecules was found to be more compatible with Langmuir isothermal and pseudo-second-order kinetic models. Moreover, research on temperature profiles pointed to the process' endothermic character. In combination with the characterization findings, it was logically concluded that the 3-APTES@MSNT nanoadsorbent's primary adsorption processes involved interaction, electrostatic interaction, hydrogen bonding interaction, and the pore-fling effect. The synthesized 3-APTES@MSNT nanoadsorbent has an interestingly high recyclability of >84.6 percent up to the fifth cycle. The 3-APTES@MSNT nanoadsorbent, therefore, showed promise for TC removal and environmental cleanup.
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DOI: 10.1021/acsomega.2c07377
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