Metal‐organic gels of simple chemicals and their high efficacy in removing arsenic(V) in water

Abstract

Metal‐organic gels (MOGs) have emerged as a class of functional materials that show great potential applications in the field of catalysis, energy storage, template synthesis, and environmental technology. The construction of functional MOGs and the control of functionality are still challenging due to complicated chemicals or routes involved in previous works. Here we report a series of tunable multifunctional MOGs by directly gelating between Fe3+ and simple chemicals, propanedioic acid (H2PA), succinic acid (H2SA), glutaric acid (H2GA), and fumaric acid (H2FA) in ethanol. The obtained MOGs exhibit self‐healing property and good conductivity, and were used for high efficacy removal of arsenic (As) in water. The ease, low cost, and scalability of the assembly process combined with multifunctionality make these MOGs be potentially applied in the fields of energy storage and sewage disposal. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3719–3727, 2018

Injectable and Sprayable Polyphenol-Based Hydrogels for Controlling Hemostasis

“…At the beginning of the stress sweep, G ′ was higher than that of G ″ under stress ranging from 1 to 400 Pa, which indicated that the elastic component was dominant in the system (Figure a). , The sol-to-gel transition point was defined as the intersection of the G ′ curve and G ″ curve at ∼400 Pa, indicative of the onset of damage of the hydrogel network . Subsequently, the time sweep showed that the damaged hydrogel could recover its initial G ′ and G ″ values within 30 s. Furthermore, the apparent viscosity (η) decreased significantly with increasing shear rates (Figure b), which demonstrated the shear thinning behavior of the gels, thus demonstrating the potential application of the hydrogels in in vivo injection …”

“…38,48 The sol-to-gel transition point was defined as the intersection of the G′ curve and G″ curve at ∼400 Pa, indicative of the onset of damage of the hydrogel network. 44 Subsequently, the time sweep showed that the damaged hydrogel could recover its initial G′ and G″ values within 30 s. Furthermore, the apparent viscosity (η) decreased significantly with increasing shear rates (Figure 5b), which demonstrated the shear thinning behavior of the gels, 50 thus demonstrating the potential application of the hydrogels in in vivo injection. 48 In addition, dynamic oscillatory rheometry was used to determine the recovery rate.…”

“…After reverting to the low strain, G′ and G″ returned to their original values within less than 1 s, demonstrating that the hydrogels could self-heal quickly and recovered to a hydrogel phase over four cycles of breakage and recovery. 50 The selfhealing of the CMCS−TA hydrogels was attributed to the formation of hydrogen bonds between CMCS and TA. Similarly, the CMCS−TA−BDBA hydrogel exhibited selfhealing behavior, which was due to the intermolecular hydrogen interactions as well as the dynamic boronate ester bonds (Figure 5d).…”

“…The gels were unaffected ( G ′ > G ″) at a low shear stress and became a sol ( G ′ < G ″) under a high shear stress. After reverting to the low strain, G ′ and G ″ returned to their original values within less than 1 s, demonstrating that the hydrogels could self-heal quickly and recovered to a hydrogel phase over four cycles of breakage and recovery . The self-healing of the CMCS–TA hydrogels was attributed to the formation of hydrogen bonds between CMCS and TA.…”

One-pot synthesis of CdS/metal–organic framework aerogel composites for efficient visible photocatalytic reduction of aqueous Cr(vi)

“… 13 MOA(Fe) showed high efficacy in removal of arsenic in water. 14 Therefore, it will be a good possibility to apply MOAs and their composites hybrided with CdS as efficient photocatalysts which has not been reported as far as we know.…”