Removal of hexavalent chromium from aqueous solutions by adsorption on modified groundnut hull

Insight into the adsorption mechanisms of methylene blue and chromium(iii) from aqueous solution onto pomelo fruit peel

“…Among the chemicals exhausted from these factories, methylene blue (MB) is responsible for fast heart rate, vomiting (spitting), shock, Heinz body formation, cyanosis, jaundice (icterus), quadriplegia and tissue necrosis in humans, [2][3][4][5] whereas chromium compounds cause nausea, diarrhoea, liver failure, dermatitis (eczema), internal haemorrhage (bleeding) and respiratory troubles. [6][7][8][9] Various chemical and physical methods have been employed to remove the MB and chromium compounds from aqueous solution, such as solvent extraction, 8 adsorption, [10][11][12][13] coagulation, [14][15][16] membrane separation, 17,18 ion exchange, 19,20 electrodeposition, 21 and reverse osmosis. 22 It is wellknown that, adsorption is a promising method to remove these compounds from waste water since this method has high enrichment efficiency and can be easily used to separate the phases.…”

Green synthesis of sulfur nanoparticles and evaluation of their catalytic detoxification of hexavalent chromium in water

“…The conventional methods of Cr(VI) removal such as coagulation, metal adsorption and reverse osmosis require high maintenance and installation costs that can be afforded only in large scale applications. 8,9 In comparison, catalytic treatments are a low cost, environmentally friendly, exible in design and commercially feasible technique to eliminate pollutants. 10 Nanomaterials are excellent catalysts due to their high surface areas.…”

Physio-chemical treatment technologies for chromium removal

“…Results also showed that removing of peptic and viscous compounds, and the incorporation of a side chain (-CH2-CH-C=N) play crucial role in the enhancement of removal capacity [32] . Groundnut hull was also considered as potential biosorbent in Owalude's study [33] . Chitosan with quaternary ammonium groups was the other kind of biosorbent with excellent adsorption capacity at 39.1 mg/L [34] .…”