Highly efficient and rapid removal of arsenic(iii) from aqueous solutions by nanoscale zero-valent iron supported on a zirconium 1, 4-dicarboxybenzene metal–organic framework (UiO-66 MOF). Issue 67 (3rd December 2019)

• Record Type: Journal Article
• Authors: Liu, Tingyi; Zhang, Zhengchao; Wang, Zhaohui; Wang, Zhong-Liang; Bush, Richard
• Is Part Of: RSC advances. Volume 9:Issue 67(2019)
• Page Start: 39475
• Page End: 39487
• Publication Date: 2019-12-03
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra08595e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A zirconium 1, 4-dicarboxybenzene metal–organic framework (UiO-66 MOF) was successfully used as a template to enhance the distribution and activity of nanoscale zero-valent iron (NZVI). Abstract : A zirconium 1, 4-dicarboxybenzene metal–organic framework (UiO-66 MOF) was successfully used as a template to enhance the distribution and activity of nanoscale zero-valent iron (NZVI). MOF-NZVI showed good anti-interference ability to co-existing ions (Ca 2+, Mn 2+, Cu 2+, H2 PO4 − and SO4 2− ) and organic acids (oxalic acid and citric acid). SEM and TEM analyses indicated that the MOF as a support efficiently prevent NZVI from aggregation for quick and effective removal of As(iii ). Through the non-linear least-squares (NLLS) adjustment, As(iii ) removal by MOF-NZVI could be well fitted by pseudo first and second order reaction kinetics, as well as the Freundlich isotherm. FTIR, XRD and XPS results verified that NZVI and iron oxyhydroxides (Fe3 O4, γ-Fe2 O3, γ-FeOOH and α-FeOOH) might be responsible for the effective removal of As(iii ) and its oxidized product As(v ) with an adsorption capacity of 360.6 mg As per g NZVI through chemical oxidation and physical adsorption. This work indicates that MOF-NZVI with good reusability and high efficiency is promising for application in As(iii )-polluted wastewater treatment.