Adsorption Evaluation for the Removal of Nickel, Mercury, and Barium Ions from Single-Component and Mixtures of Aqueous Solutions by Using an Optimized Biobased Chitosan Derivative

Abstract

In this experimental study, the use of 5-hydroxymethyl-furfural (HMF) organic compound as a grafting agent to chitosan natural polymer (CS) was examined. One optimized chitosan derivative was synthesized, and then tested (CS-HMF), in order to uptake nickel, mercury, and barium metal ions from single- and triple-component (multi-component) aqueous solutions. The characterization of the material before and after the metal uptake was achieved by scanning electron microscopy (SEM). The ability of the adsorption of CS-HMF was tested at pH = 6. The adjusting of temperature from 25 to 65 °C caused the increase in the adsorption capacity. The equilibrium data were fitted to the models of Langmuir and Freundlich, while the data from kinetic experiments were fitted to pseudo-1st and pseudo-2nd order models. The best fitting was achieved for the Langmuir model (higher R2). The adsorption capacity for nickel, mercury, and barium removal at 25 °C (single component) was 147, 107, and 64 (mg/g), respectively. However, the total adsorption capacity for the multi-component was 204 mg/g. A thermodynamic study was also done, and the values of ΔG0, ΔH0, and ΔS0 were evaluated.

Activated Carbon from the Peelings of Cassava Tubers (Manihot esculenta) for the Removal of Nickel(II) Ions from Aqueous Solution

“…e flask was magnetically stirred for 3 hours, and the content was filtered into a dry conical flask. en, 10 mL of the filtrate was titrated against sodium thiosulphate solution (5 × 10 −3 M) (Na 2 S 2 O 3 from Acros organics at 99% purity) using starch as indicator until a clear solution was observed according to equation (5). e volume delivered by the burette was then noted (V n ).…”

“…Above permissible concentrations (toxic limits) of nickel of 0.1 mg/m 3 (World Health Organization (WHO)) [4], different types of diseases may be contracted such as lung cancer, renal edema, dermatitis, and gastrointestinal disorder. Conventional methods for nickel(II) removal from wastewater include chemical oxidation or reduction, chemical precipitation, ion exchange, membrane separation, filtration, electrochemical treatment, and adsorption [5]. ese techniques which are economically expensive suffer from incomplete metal removal, generation of toxic sludge, and other disposable waste products [6].…”

Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution

“…This means that the pseudo 2nd order model is more suitable to describe the adsorption mechanism of Cr(VI) ions on the surface of ppy/NC nanocomposite. These results indicated that the chemical sorption is the essential mechanism of Cr(VI) removal on the surface of ppy/NC nanocomposite rather than a usual mass transport [42,43]. Additionally, several previous works on the adsorption of Cr(VI) ions showed the applicability of pseudo 2nd order as a better model for the description of the removal mechanism than other kinetic models [44][45][46][47].…”

Barium/Cobalt@Polyethylene Glycol Nanocomposites for Dye Removal from Aqueous Solutions

“…In this study, experiments related to contact time (5,15,30,45,60,90,120,150, and 180 min) in adsorption kinetic studies were performed by adding 0.1 g/L of synthesized adsorbent with 50 mL of dye solution. Then samples were shaken with agitation rate of 150 rpm, at pH = 2 and temperature of 25…”