AI Article Synopsis
- The study developed GO- and SBA-15-modified UiO-66 adsorbents to efficiently remove trace Cr(vi) from wastewater, with the GO-modified version achieving a 97% removal rate in just 3 minutes.
- Characterization confirmed that UiO-66 nanoparticles could be successfully integrated into the SBA-15 matrix and attached to GO layers, enhancing their absorption performance.
- The research found that the adsorption of Cr(vi) was fast and exothermic, involving both physical and chemical interactions, and highlighted that the hybridization methods influenced the materials' absorption processes and regeneration capabilities.
Article Abstract
The GO- and SBA-15-modified UiO-66 adsorbents were developed for removal of trace Cr(vi) from wastewater and investigated to understand the effect of different hybrid ways on the absorption activity and reaction mechanism. The characterization results confirmed that the UiO-66 nanoparticles could be encapsulated by the SBA-15 matrix and anchored onto GO layers. Due to different exposure modes, the adsorption results showed that the GO-modified UiO-66 had better Cr(vi) trapping performance with the maximum removal efficiency of 97% within 3 min, presenting one of the most efficient Cr(vi) removal materials. Kinetic models showed that the adsorption process included fast, exothermic, spontaneous and pseudo-secondary chemical adsorption. By comparison with the Freundlich and Temkin model, the results revealed that the adsorption process of Cr(vi) by UiO-66@SBA-15 involved some multi-layer physical adsorption, while Cr(vi) was adsorbed onto the UiO-66@GO surface. The mechanism study also found that the fixation of Cr was the chemical action of UiO-66 on GO. Additionally, the encapsulated way increases the protection of UiO-55 from surface damage. In all, both hard-core-shell UiO-66@SBA-15 and piece UiO-66@Go increase the absorption activity of Cr(vi), but the different hybrid ways lead to different activities, absorption processes and regeneration abilities.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10187030 | PMC |
| http://dx.doi.org/10.1039/d3ra01308a | DOI Listing |
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