Experimental data on adsorption of Cr(VI) from aqueous solution using nanosized cellulose fibers obtained from rice husk

Abstract

The aim of this study was to evaluate the efficiency of nano-sized cellulose obtained from rice husk for Cr(VI) adsorption. The effect of operational parameters including initial pH (3–10), contact time (0–120 min), adsorbent dosage (0.2–1.5 g/L), and initial Cr(VI) concentration (5–50 mg/L) were investigated according to one factor at time method. The results showed, in pH=6, contact time=100 min, adsorbent dose=1.5 g/L and 30 mg/L initial chromium concentration, the adsorption efficiency reached to 92.99%. Also Langmuir isotherm with (R2=0.998 at 303 °K) and pseudo-first-order kinetic model (R2=0.993) were the best models for describing the Cr(VI) adsorption reactions. The negative values of ΔG∘ and positive value of ΔH∘ showed that, the Cr(VI) adsorption on NCFs was endothermic and spontaneously process. Therefore, it can be concluded that the application this method is recommended for removing Cr(VI) from aqueous solutions.

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

“…An alkali solution can be used for the regeneration of consumed adsorbent and adsorbed chromate ions. In the alkali solution, hydroxyl ions show a ligand exchange reaction with the adsorbed chromate anions ( Pourfadakari et al., 2017 ). The desorption capability of Cr(VI) adsorbed CALS by using different concentrations of NaOH ranging from 0.05–3.0 M is presented in Figure 12 (a).…”

Efficient Sequestration of Cr(VI) from Aqueous Solution Using Biosorbent Derived from Arundo donax Stem

“…NaOH solution can be used to regenerate biosorbent and recover Cr(VI) ions that have been consumed by the adsorbent. According to Scheme 3, hydroxyl ions present in solution exhibit ligand replacement reaction with the sorbed oxyanions of Cr(VI) [45,62].…”

Ultrasound assisted batch operation for the adsorption of hexavalent chromium onto engineered nanobiocomposite

“…(2016)14Polyethylenimine-functionalized cellulose aerogel beads2180 min.0.02 g dm −3 100 mg dm −3 298 K229.1 mg g -1 Guo et al. (2017)15Nanosized cellulose fibers from rice husk6100 min.1.5 g dm −3 30 mg dm −3 303 K3.76 mg g -1 Pourfadakari et al. (2017)16Starch and sodium carboxymethyl cellulose-coated Fe and Fe/Ni nanoparticles2120 min.1 g dm −3 1 mg dm −3 298 K95.70%Wang et al.…”