Regeneration of anion‐exchange resins with Mg/Al double‐metal hydroxides

Abstract

Anion-exchange resins (AERs) were regenerated with Mg/Al double-metal hydroxides as the regenerant. Electrical conductivity breakthrough curves were adopted to estimate the relatively rapid regenerative effect of the AERs. The results show that the optimal regenerative effect of AER was obtained when the Mg/Al molar ratio was 3 and the dosages of Mg and Al hydroxides were 0.045 and 0.015 mol, respectively. The highest effluent water yield was obtained at an AER/cation-exchange resin volume ratio of 2:1. Characterization through scanning electron microscopy, X-ray diffraction, and thermogravimetry-differential thermal analysis showed that the regenerant was transformed and exhibited the distinguishing features of Mg/Al layered double hydrotalcites. Cycle experimentation showed that all calcined products effectively regenerated the fouled resins, and the regenerative mechanism was then established.

Enhancement of photocatalytic H2 evolution on Zn0.8Cd0.2S loaded with CuS as cocatalyst and its photogenerated charge transfer properties

“…Up to now, the role of CuS loaded on chalcogenides in improving the photocatalytic efficiency is controversial. Wang et al 33 suggested that CuS as a cocatalyst served as trapping sites for photogenerated electrons, while Shen and coworkers 23 postulated that CuS as a cocatalyst trapped holes. As we know, a photocatalytic reaction occurs at the interface between catalyst surface and solution.…”