Adsorption of cadmium(II) from aqueous solution on natural and oxidized corncob

Hexavalent Chromium Removal by a Paecilomyces sp

“…Figure 4 shows an increasing trend of Cr (VI) removal with the rise in temperature from 28 to 60°C. Results that is consistent with those of , who observed that at 45°C and 24 h, adsorption occurs for the same metal with Aspergillus niger, and Leyva-Ramos et al, (2005) for the removal of cadmium (II) with corn cob (40 °C and 5 days), but differ from 35°C and 24 h reported by Sag and Aktay (2002) for Rhizopus arrhizus, and with those reported for mandarin flax husk (Zubair, et al, 2008). The increase in Cr (VI) uptake may be due to creation of some new sorption sites on the sorbent surface or the increased rate of intraparticle diffusion of sorbate ions into the pores of adsorbent at higher temperature, as diffusion is an endothermic process (Das, et al, 2000).…”

Hexavalent Chromium Removal by Citrus limonium Shell

“…At this point the total removal of the metal is carried out. The results are coincident for tamarind Shell with 95% of remotion at 58˚C and 3 hours [22], for the adsorption of Cadmium(II) from aqueous solution on natural and oxidized corncob (40˚C and 5 days) [27], but this are different for the mandarin waste [25], Caladium bicolor (wild cocoyam) biomass [28], and Saccharomyces cerevisiae [29]. The increase in temperature increases the rate of removal of Chromium(VI) and decreases the contact time required for complete removal of the metal, to increase the redox reaction rate [22].…”

Sorption dynamics of Direct Orange 26 dye onto a corncob plant sorbent

“…Figures 2 and 3 show the granulated sorbent and the photo of its surface. Apart from being used for dye sorption, corncobs are also reported to be widely used for removal of heavy metals from aqueous solutions [13][14][15][16]. Corncobs are also equally commonly used to obtain activated carbon [17][18][19][20][21].…”