Adsorption isotherm and kinetics analysis of hexavalent chromium and mercury on mustard oil cake

Abstract

The biosorption process has been established as characteristics of dead biomasses of both cellulosic and microbial origin to bind metal ion pollutants from aqueous suspension. The high effectiveness of this process even at low metal concentration, similarity to ion exchange treatment process, but cheaper and greener alternative to conventional techniques have resulted in a mature biosorption technology. Yet its adoption to large scale industrial wastewaters treatment has still been a distant reality. The purpose of this review is to make in-depth analyses of the various aspects of the biosorption technology, staring from the various biosorbents used till date and the various factors affecting the process. The design of better biosorbents for improving their physico-chemical features as well as enhancing their biosorption characteristics has been discussed. Better economic value of the biosorption technology is related to the repeated reuse of the biosorbent with minimum loss of efficiency. In this context desorption of the metal pollutants as well as regeneration of the biosorbent has been discussed in detail. Various inhibitions including the multi mechanistic role of the biosorption technology has been identified which have played a contributory role to its non-commercialization.

Fabrication of Fibrous Materials Based on Cyclodextrin and Egg Shell Waste as an Affordable Composite for Dental Applications

“…The nitrogen adsorption/desorption isotherm of samples synthesised under optimal electrospinning conditions was shown in Figure 6. The adsorption/desorption of the samples is similar to the second-kind of isotherms, demonstrating the meso-nature of the porous size distribution for the compound, according to the results (Reddy et al, 2017). Furthermore, BET curve results show that the samples have a specific surface area of about 273 m 2 /g.…”

New highly-percolating alginate-PEI membranes for efficient recovery of chromium from aqueous solutions

“…Many previous studies have shown that NaOH solutions are highly efficient for desorbing Cr(VI) from loaded sorbents (Debnath, Maity, & Pillay, 2014;Hui, Chao, & Kot, 2005;Reddy, Chauhan, & Chakraborty, 2016). Fig.…”

Cr(VI) removal using Fe₂O₃-chitosan-cherry kernel shell pyrolytic charcoal composite beads

“…However, the increase of pH also increases the reduction of Cr(VI) to the positively charged Cr(III). Adsorption of Cr(III) species onto protonated CKSC and Fe-C-CKSC surface decreased due to the fact that the opposite charges repel each other [43]. The mechanisms of removal of Cr(VI) by Fe-C-CKSC include mainly electrostatic attraction between protonated adsorbent surface (-OH 2 + and -NH 3 + groups) and Cr(VI) species, ligand exchange of Cr(VI) species and re-sorption of Cr(III) reduced from Cr(VI) via chelation.…”