Zirconium dioxide (cas 1314-23-4) loaded montmorillonite composites as high-efficient adsorbents for the removal of Cr3+ ions from tanning wastewater

Add time:08/17/2019    Source:sciencedirect.com

Zirconium dioxide (cas 1314-23-4) loaded montmorillonite (ZrO2-MMT) composites have been prepared using an ion-exchange process at room temperature followed by a thermal treatment. The as-prepared composites are used to adsorb Cr3+ ions in the tanning wastewater with a lower initial Cr3+ concentration, reducing residual Cr3+ concentration to less than 1 mg L−1. XRD, TEM, SEM-EDS and XPS analyses are made to explore the structure and morphology of the composites. ZrO2 is found to load on the interlayer and surface of MMT. The adsorption process is appropriately described by the pseudo-second-order kinetic equation and Langmuir equation. The ZrO2-MMT composites exhibit a better adsorption capacity than adsorption materials reported in the literature, and the maximum adsorption capacity for the initial Cr3+ concentration of 10, 20, 30 mg L−1 is as large as 142.86, 158.73 and 172.41 mg g−1, respectively. The removal efficiency of ZrO2-MMT for Cr3+ remains above 92% after six cycles.

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