Simple and selective extraction process for chromium (VI) in industrial wastewater

Site-specific functionalization for chemical speciation of Cr(III) and Cr(VI) using polyaniline impregnated nanocellulose composite: equilibrium, kinetic, and thermodynamic modeling

“…Considering the above point in mind, eluent such as sodium hydroxide was examined for effective desorption under optimum conditions. The reagent has also proved their efficacy in some of our earlier studies pertaining to the abatement of chromium (Kalidhasan and Rajesh 2009;Kardam et al 2012). The results are depicted in Fig.…”

Effective adsorption of hexavalent chromium through a three center (3c) co-operative interaction with an ionic liquid and biopolymer

“…Hence, the expanded bed could be the reason for the reduction in the adsorption efficiency at higher sample volume. The regeneration of the adsorbent was examined using certain reducing agents such as sodium nitrite, sodium sulfite, ascorbic acid [24,26,34,[42][43][44] and sodium metabisulfite which are recognized to reduce the hexavalent chromium to trivalent state. Reagents such as sodium hydroxide and ammonium hydroxide were also explored since they possess the ability to elute the hexavalent chromium to the respective sodium and ammonium salts.…”

Selective extraction of chromium(VI) using a leaching procedure with sodium carbonate from some plant leaves, soil and sediment samples

“…Most of speciation methods are based on a previous pretreatment step of the sample to separate and preconcentrate one oxidation state and sequential determination of both chromium forms. The methods currently used include solid phase extraction [19][20][21][22][23][24][25], liquid-liquid extraction [26,27], coprecipitation [28][29][30], ion exchange [31,32]. In many cases, several manipulation steps, which are time consuming, complex and labor-intensive, are required.…”