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Water pollution by hexavalent chromium, Cr(VI), poses serious concerns due to its detrimental public health effects. In this work, we report the synthesis, characterization, and sorption properties for Cr(VI) by MoS 42-  intercalated layered double hydroxide, CoAl-MoS 4 -LDH (CoAl-MoS 4 ). Our results show that CoAl-MoS 4  can effectively remove Cr(VI) ions from acidic, neutral, and basic media. At neutral medium, it exhibits a very strong affinity,  K d∼ 1.91 × 10 5  mL/g, toward Cr(VI) ions. Under such conditions, this material can remove over 99% of Cr(VI) from a ∼10 4  ppb of Cr(VI) contaminated solutions, leaving behind residual concentration below the World Health Organization (WHO) defined limit for drinking water. Moreover, our study shows that CoAl-MoS 4  is a highly-competent Cr(VI) adsorbent exhibiting a removal capacity ( q m) as high as ∼231 mg/g. The CoAl-MoS 4  follows pseudo-second order rate kinetics for the sorption of chromate, and the concentration dependent sorption data can be fitted well with the Langmuir sorption isotherm. Furthermore, CoAl-MoS 4  is highly selective to Cr(VI) ions in the presence of various competitive ions in contaminated water systems. All these results suggest that CoAl-MoS 4  is a very efficient sorbent for decontamination of hexavalent chromate from wastewater systems.

Efficient removal of chromium(VI) ions by hexagonal nanosheets of CoAl-MoS 4 layered double hydroxide