New generation adsorbents for water treatment.

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

Impact of humic/fulvic acid on the removal of heavy metals from aqueous solutions using nanomaterials: A review

Though many efforts have been devoted to the adsorptive removal of hazardous materials of organophosphorus pesticides (OPs), it is still highly desirable to develop novel adsorbents with high adsorption capacities. In the current work, the removal of two representative OPs, glyphosate (GP) and glufosinate (GF), was investigated by the exceptionally stable Zr-based MOFs of UiO-67. The abundant Zr–OH groups, resulting from the missing-linker induced terminal hydroxyl groups and the inherent bridging ones in Zr–O clusters of UiO-67 particles, served as natural anchorages for efficient GP and GF capture in relation with their high affinity toward phosphoric groups in OPs. The correlation between the most significant parameters such as contact time, OPs concentration, adsorbent dose, pH, as well as ionic strength with the adsorption capacities was optimized, and the effects of these parameters on the removal efficiency of GP and GF from the polluted aqueous solution were investigated. The adsorption of GP on U...

Effective adsorption and enhanced removal of organophosphorus pesticides from aqueous solution by Zr-based MOFs of UiO-67.

In this study, water stable zirconium metal-organic framework (UiO-66) has been synthesized and for the first time applied as an adsorbent to remove aquatic arsenic contamination. The as-synthesized UiO-66 adsorbent functions excellently across a broad pH range of 1 to 10, and achieves a remarkable arsenate uptake capacity of 303 mg/g at the optimal pH, i.e., pH = 2. To the best of our knowledge, this is the highest arsenate As(V) adsorption capacity ever reported, much higher than that of currently available adsorbents (5–280 mg/g, generally less than 100 mg/g). The superior arsenic uptake performance of UiO-66 adsorbent could be attributed to the highly porous crystalline structure containing zirconium oxide clusters, which provides a large contact area and plenty of active sites in unit space. Two binding sites within the adsorbent framework are proposed for arsenic species, i.e., hydroxyl group and benzenedicarboxylate ligand. At equilibrium, seven equivalent arsenic species can be captured by one Zr6 cluster through the formation of Zr-O-As coordination bonds.

/pdf/superior-removal-of-arsenic-from-water-with-zirconium-metal-4qaqe4sfpf.pdf

Superior removal of arsenic from water with zirconium metal-organic framework UiO-66.

Adsorption of fluoride by Fe–Mg–La triple-metal composite: Adsorbent preparation, illustration of performance and study of mechanisms

Removal of arsenite from aqueous solution by a zirconia nanoparticle

Arsenic contamination is a global environmental problem due to arsenic’s high toxicity, bioaccumulation in human body and food chain, and severe carcinogenicity to humans. Development of cost-effec...

Rare-earth metal based adsorbents for effective removal of arsenic from water: A critical review

Yttrium-doped iron oxide magnetic adsorbent for enhancement in arsenic removal and ease in separation after applications.

Arsenic contamination in natural water has become a global issue because of arsenic’s high toxicity, accumulation in the human body, and carcinogenicity. In this study, a new yttrium–manganese binary composite was developed by a one-step coprecipitation method. The mean diameter of the adsorbent was 6.3 μm, and the point of zero charge was 7.1. The adsorbent had a chemical formula of Y5Mn6O6(OH)12(CO3)5·5H2O according to the results obtained from the analysis of the element and functional group from X-ray photoelectron spectroscopy (XPS) study. The field emission scanning electron microscopy study showed that the adsorbent had a loose structure and was composed of nanosized flakes. The adsorption process was pH-dependent. The removal efficiency of arsenate by the adsorbent was much higher than that of arsenite. The optimal adsorption efficiency of arsenate was obtained at pH 6.0. The kinetics study showed that adsorption equilibrium of arsenate was reached within 25 h. The fit of the experimental data of ...

Ling Yu

Papers

Adsorption of fluoride by Fe–Mg–La triple-metal composite: Adsorbent preparation, illustration of performance and study of mechanisms

Removal of arsenite from aqueous solution by a zirconia nanoparticle

Rare-earth metal based adsorbents for effective removal of arsenic from water: A critical review

Yttrium-doped iron oxide magnetic adsorbent for enhancement in arsenic removal and ease in separation after applications.

Introduction of an Yttrium–Manganese Binary Composite That Has Extremely High Adsorption Capacity for Arsenate Uptake in Different Water Conditions