Oxolane-2,5-dione modified electrospun cellulose nanofibers for heavy metals adsorption

Synthesis of micro-particles using Hydrocotyle Ranunculoides (Floating Water Pennywort) and their use in Cadmium adsorption.

“…When the initial pH was increased from 2.0 to pH 5.0 an increase in cadmium uptake was observed probably because the adsorbent is protonated at low pH, however higher pH favours ion exchange because the adsorbent will be deprotonated. The optimum pH for Cd (II) adsorption was at pH 5.0 and was used during the experiments and similar results were found by Ammari et al, (2015) [9], Stephen et al, (2011) [18]. The percentage Cd (II) uptake decreased at pH above 5.0 and similar results were found by Li et al ., 2012) and they concludes that the concentration of cadmium species decreases with increase in pH whereas Cd (II) precipitates as hydroxides species such as [Cd (OH) 4 , [Cd(OH) 3 , , ] and at higher pH resulting in their concentrations being higher in solution; however, the concentration of hydroxide decreases at lower pH.…”

“…The equilibrium adsorption experiments were carried out by a method adapted from (Stephen et al, 2011) [18]. The experiments were carried out by varying dosage from 20-100 mg of the micro-particles with 20 mL of initial Cd (II) concentration from 0 -80 mg/L solution in 100 mL polyethylene bottles in an orbital shaker with constant agitation at 125 rpm between 20 -300 minutes at pH 2.0-8.0.…”

“…The quality of the adsorbent is gauged by a high rate of removal of toxic substances from wastewater [18]. The effect of contact time was determined by contacting the micro-particles with cadmium solution for five hours.…”

“…In our earlier research article, we reported for the first time, competitive adsorptive removal of Pb, Cu and Cd from water using H. ranunculoides fixed on alginate. H. ranunculoides has become pervasive in Lake Chivero, Zimbabwe, and is increasingly replacing E. Crassipes [17] [18]. The current work investigates the potential of micro-particles prepared using H. ranunculoides as adsorbent for Cd (II) from aquatic systems.…”

A review on electrospun bio-based polymers for water treatment

“…For example, Frenot et al [11] found that the collected fibre stood straight up on the collector when plastic and aluminium covered plates are used as collectors. However, the use of a rotating drum/copper or liquid bath collector in a suitable humidity resulted in smooth bead-free fibres [76,142,143]. Cellulose cannot melt and is insoluble in water and most of the common organic solvents because of the dense hydrogen network which limits its applications and processability.…”