Chromium(VI) adsorption from aqueous solution onto Moroccan Al-pillared and cationic surfactant stevensite

Adsorption behaviour of functional grafting particles based on polyethyleneimine for chromate anions

“…Among various heavy metals, chromium poses severe threats to public health. Chromate as a species of hexavalent chromium is known to be high toxic and have powerful carcinogenic effect [1][2][3][4][5], and the maximum permissible level of chromate salt in drinking and industrial wastewater were set by the Environmental Protection Agency (EPA) to be 50 and 200 g/L, respectively [6]. The chromium pollution mainly results from the wastewater and wastes discharged by leather tanning, electroplating, metallurgy, chemical engineering, mining industries, and so on.…”

Behavior of Cr(VI) removal from wastewater by adsorption onto HCl activated Akadama clay

“…Aluminum oxide/hydroxy and iron oxides/hydroxides have been proved to have high affinity and effective selectivity toward Cr(VI) oxyanions [28,29]. The surface elemental analysis of pristine AC and HCl-AC by EDX is listed in Table 1a.…”

“…It could be concluded that besides quartz, the main crystal compositions of HCl-AC are still diaspore and hematite [24]. The increase in ≡Al-and ≡Fe-functional groups would create more active sites and hence be favorable for Cr(VI) oxyanions adsorption [28,29].…”

Chromium removal using poly(4-vinylpyridinium)-modified treated clay salts

“…Chromium is one of these heavy metals which is used in many industrial processes, such as plating, alloying, tanning of animal hides, and as water corrosion inhibitor [2]. Chromium exists in trivalent (Cr(III)) and hexavalent (Cr(VI)) oxydation states in the environment.…”