Adsorption of Cr(VI) using Fe-crosslinked chitosan complex (Ch-Fe)

Adsorption of Cr(VI) on crosslinked chitosan–Fe(III) complex in fixed-bed systems

“…Another effect of increasing pH, is deprotonation the hydrated surface of Ch-Fe, thereby acquiring a negative charge, resulting in electrostatic repulsion and reducing the adsorption of Cr(VI). These results are consistent with those reported in the study of Cr(VI) adsorption by Ch-Fe in the batch system [7,35,36].…”

“…The crosslinked chitosan-Fe(III) complex (Ch-Fe) adsorbent used in this work has previously been prepared and characterized [7,26]. The average particle size was 4.7 ± 1.7 m [26], the quantity of iron was 80.6 mg/g and the zero-point charge (pH zpc ) was 8.9 [27].…”

“…Adsorption is the process whereby molecules are concentrated on the surface of the sorbent. A variety of materials has been used as Cr(VI) adsorbents, agricultural waste [5], Fe-grown carbon nanofibers [6] chitosan-Fe(III) crosslinked [7,8], magnetic chitosan-Fe(III) [9], hydrogel iron(III) complex amino-functionalized poly(acrylamide)-grafted coconut coir pith [10], biochar-supported zerovalent iron [11], ethylenediaminemodified crosslinked magnetic chitosan [12], polyaniline/silica gel composite [13], iron nanoparticles doped ordered mesoporous carbon [14], iron Fe +3 oxide/hydroxide nanoparticles [15], sugarcane bagasse-Fe(III) [16], Fe(III)-coated natural zeolite [17], Fe(II)-coated natural zeolite [18].…”

“…A great number of publications related to adsorption of Cr(VI) by chitosan-iron complex or magnetic chitosan using batch methods, have recently been reported in the literature [7][8][9]19] however, there is no reports on the use of these adsorbents in fixed-bed method. The use of magnetic particles is restricted to the separation process using the batch method, and it is not appropriate for fixed-bed process.…”

Chromium(VI) Removal by Fe(III)-loaded Succinylated Mercerized Cellulose from Aqueous Solution

“…A number of metal-loading materials that remove pollutants from water have been reported. These include yttrium-loaded poly-(hydroxamic acid) resin (Haron et al 1995), polymer complex of zirconium(V) (Yuchi et al 1999), Fe(III)-loaded cotton cellulose (Zhao et al 2008), chitosan-Fe(III) complex (Zimmermann et al 2010;Shen et al 2013), crosslinked alumina-chitosan hybrid adsorbent (Ji et al 2012), and chitosan/Al2O3/magnetite nanoparticles composite adsorbent (Bahareh et al 2015).…”