Efficient biosorption of hexavalent chromium from water by modified arecanut leaf sheath

Acid-treated pomegranate peel; An efficient biosorbent for the excision of hexavalent chromium from wastewater

“…Due to the availability of surface-active sites, the amount of the metal ion that is adsorbed increases as the adsorbent dosage increases. The results are found agreeing to the findings of Pant et al [ 23 ].

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“…9 , it was determined that the pseudo-second-order model, which had a higher correlation coefficient (R 2 ) value than the pseudo-first-order kinetic model, best explained the adsorption of Cr(VI) onto CPP, suggesting that the Cr(VI) adsorption onto CPP may be driven by chemisorption. The results of the kinetic study were found to align with similar studies conducted previously, that used several biomass-based adsorbents for the adsorption of Cr(VI) ions [ 22 , 23 ]. The calculated kinetic parameter values are shown in Table 2 .…”

“…The first stage is external diffusion, which involved the transport of metal ions from the solution to the external surface of the CPP. The second is intra-particle diffusion, in which the chromium ions got diffused from the surface into the pores of the CPP [ 23 ].

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“…Several methods are being studied and used to eliminate Cr(VI) from the aquatic environment, some of which are ion exchange [ 18 , 19 ], electro-dialysis [ 20 ], redox reaction, membrane technology [ 21 ], and adsorption [ [22] , [23] , [24] ]. Most of the aforementioned solutions can only be used to a certain extent due to the requirement for expensive equipment, incomplete metal removal, hazardous waste sludge, and disposal [ 16 , [25] , [26] , [27] ].…”

Chemical Modification of Banana Peels and Banana Pseudostem for the Adsorptive Removal of Chromium (VI) from Aqueous Solution

“…Cr(VI) can cause serious health problems like respiratory infections, weakness in the immune system, liver and skin problems, lung cancer, and death. Inhalation of hexavalent chromium can affect badly the larynx, pharynx, and lungs, and bioaccumulation of Cr(VI) in essential organs could damage metabolic functions https://www.nepjol.info/index.php/JNCS and have carcinogenic, mutagenic, and teratogenic impacts on living beings [7,8] Several treatment technologies have been evolved to immobilize Cr(VI) from aqueous environments including, the conventional chemical process like chromium hydroxide precipitation along with other methods such as ion exchange, reduction, electrochemical precipitation, solvent extraction, membrane separation, evaporation, foam separation, electro-dialysis and so on [9]. The continuing increase in the variety and amount of hazardous chemicals in effluents make conventional separation methods inefficient and sometimes even ineffective and inadequate.…”