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Self-diffusing halloysite-based adsorbent for efficient and selective lead removal
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DOI：10.1016/j.seppur.2025.135651.png)
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Abstract
En 中文
Self-propelled nanomotors exhibit significant propulsion capabilities, which can enhance the efficiency of uptake of lead pollutant at low concertation. However, a persistent challenge remains in establishing effective speed control over nanomotors, as the movement of most motors is predominantly reliant on the concentration of available fuel. To adjust the speed of a halloysite-nanotube-based nanomotor, a temperature-responsive polymer brush is chemically grown onto the halloysite nanotubes (HNTs). This modification allows for the enlargement or constriction of the HNTs cavity in response to temperature change. Chemical modification on HNTs improves the effect of lead removal by increasing the adsorption sites, making it easier for grabbing ion. The mobility and adsorption abilities of the synthesized HNTs nanomotor exhibit significant variations at approximately 45 °C. To further study the adsorption capacity of Pb (II) by HNTs nanomotor reached an optimal level at a pH of 5.0 and peroxide concentrations of 5.0 wt%, reaching up to 49.936 mg g−1, with saturation occurring within 40 min. We successfully fabricated nanosized self-propelled motors, the motion of which can be reversibly controlled by a thermally responsive brake, resulting in a lead removal efficiency of 98 %. Furthermore, 90 % of the original adsorption capacity was maintained after five repetitions. We envision that such artificial responsive nano systems could have significant applications in the controllable cargo transportation. The prepared material exhibited favorable biocompatibility, providing new research insights into the design and application of nanomotors in removing of Pb (II) from the bloodstream.
Keywords:
Halloysite nanotube
Self-propelled nanomotor
Thermoresponsive adsorption
Lead detoxification
Activity correction
Journal
IF:
9
Papers:
2.9W
Citations:
12.1W