Arsenic removal from water/wastewater using adsorbents—A critical review

Highly efficient removal of metal ion pollutants, such as toxic and nuclear waste-related metal ions, remains a serious task from the biological and environmental standpoint because of their harmful effects on human health and the environment. Recently, highly porous metal–organic frameworks (MOFs), with excellent chemical stability and abundant functional groups, have represented a new addition to the area of capturing various types of hazardous metal ion pollutants. This review focuses on recent progress in reported MOFs and MOF-based composites as superior adsorbents for the efficient removal of toxic and nuclear waste-related metal ions. Aspects related to the interaction mechanisms between metal ions and MOF-based materials are systematically summarized, including macroscopic batch experiments, microscopic spectroscopy analysis, and theoretical calculations. The adsorption properties of various MOF-based materials are assessed and compared with those of other widely used adsorbents. Finally, we propose our personal insights into future research opportunities and challenges in the hope of stimulating more researchers to engage in this new field of MOF-based materials for environmental pollution management.

Metal–organic framework-based materials: superior adsorbents for the capture of toxic and radioactive metal ions

Surface complexation of arsenic(V) to iron(III) (hydr)oxides: structural mechanism from ab initio molecular geometries and EXAFS spectroscopy

Three metal–organic frameworks (MOFs) of the UiO-68 network topology were prepared using the amino-TPDC or TPDC bridging ligands containing orthogonal phosphorylurea groups (TPDC is p,p′-terphenyldicarboxylic acid), and investigated for sorption of uranium from water and artificial seawater. The stable and porous phosphorylurea-derived MOFs were shown to be highly efficient in sorbing uranyl ions, with saturation sorption capacities as high as 217 mg U g−1 which is equivalent to binding one uranyl ion for every two sorbent groups. Coordination modes between uranyl groups and simplified phosphorylurea motifs were investigated by DFT calculations, revealing a thermodynamically favorable monodentate binding of two phosphorylurea ligands to one uranyl ion. Convergent orientation of phosphorylurea groups at appropriate distances inside the MOF cavities is believed to facilitate their cooperative binding with uranyl ions. This work represents the first application of MOFs as novel sorbents to extract actinide elements from aqueous media.

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Highly porous and stable metal–organic frameworks for uranium extraction

Removal of arsenic (III) and arsenic (V) from aqueous medium using chitosan-coated biosorbent.

Mechanism of anion retention from EXAFS and density functional calculations: Arsenic (V) adsorbed on gibbsite

Adsorption and desorption of arsenic on an oxisol and its constituents

Influence of anionic species on uranium separation from acid mine water using strong base resins.

Uranium recovery from industrial effluent by ion exchange—column experiments

Waste materials, stored in inappropriate places, are one of the most significant environmental issues concerning mining activities. In Brazil, one closed uranium mine has faced such a problem. The ...

Ana Cláudia Queiroz Ladeira

Papers

Mechanism of anion retention from EXAFS and density functional calculations: Arsenic (V) adsorbed on gibbsite

Adsorption and desorption of arsenic on an oxisol and its constituents

Influence of anionic species on uranium separation from acid mine water using strong base resins.

Uranium recovery from industrial effluent by ion exchange—column experiments

Recovery of Uranium from Mine Waste by Leaching with Carbonate-Based Reagents