Fig. 5. DRIFTS spectra of HCl-UiO-66|_9/12 sample before and after As^V treatment, showing the presence of –As–O–H bonds after exposure. Spectra for powder Na₂HAsO₄·7H₂O are included as reference. Data for AcOH-UiO-66|_11/12 can be found in the ESI,† Fig. S14.