Abstract:
Chromium is one of the most typical heavy metal pollutants that is genotoxic, carcinogenic and
accumulates in plant and animal bodies. The use of emerging materials for efficient removal
of chromium is in high demand. MXene and MoS2 were employed in this investigation to
extract hexavalent chromium (Cr(VI)). The pseudo second order kinetic model described the
adsorption of Cr(VI) on MXene and MoS2. In the meanwhile, the Freundlich and Langmuir
Isotherm models best fitted MXene and MoS2, respectively. The greater number of surfaceactive sites in MoS2 led to a higher removal efficiency for Cr(VI) as compared to MXene. At
298K, the highest adsorption capacities of MXene and MoS2 for Cr(VI) were 59.805 mg/g and
113.71 mg/g, respectively. Thermodynamic investigations of both materials exhibited that the
adsorption process was endothermic and spontaneous. The effect of coexisting ions was also
investigated in the study that involves coexisting anions like PO4
3-
, HCO3
2-
, Cland coexisting
cations such as Ca2+, Mg2+, Na1+. MXene showed a decrease in removal percentage up to 70%
after fifth cycle whereas the decrease in percentage removal reached 79% in case of MoS2 after
fifth cycle. According to the findings, it can be inferred that these developed materials have the
advantages of simplicity and effortless operation like adsorption for reducing heavy metal
pollution.
