Neem powder is packed in column and water containing Fe (III) is continuously running through column. After process of cleaning water, we want to reuse this neem powder. We want to now what is best eluting liquid for this neem.
In my opinion HNO3 is not good desorption solution because it act as oxidizing agent and able to change the composition of adsorbing materials. In working condition, if adsorbent simply going to reflux with distilled water for some time period, so Fe(III) may be desorbed.
Here I am giving a reported but modified desorption study process and wish it will be helpful for your desorption study (vide reference Journal of Hazardous Materials 143 (2007) 220–225):
For the desorption study, 0.20 g biomass was contacted with
50 ml Fe(III) solution (500 mg/L). After adsorption experiment,
the biomass was collected by filtration and washed with
distilled water for three times, to remove residual Fe(III) on the
surface. Then it was transferred to 50 ml desorbent solutions:
HNO3, Ca(NO3)2, EDTA (0.10 and 0.01 M, respectively) and
H2O. The mixtures were shaken for 18 h, then the filtrates were
analyzed to determine the concentration of Fe(III) after desorption.
Desorption ratio was calculated from the amount of metal
ions adsorbed on the biomass and the final metal ion concentration
in desorption medium, as the following equation:
Desorption ratio = Amount of metal ions desorbed/Amount of metal ions adsorbed × 100
I wonder wether or not it is clever to use water to wash of Fe(III) cause it may cause precipitation of iron-oxyhydroxides that form as a consequence of Fe(III) initiated hydrolysis. Is one of you aware of negative effects of this precipate formation? I imagin some sort of coating may form, that prevents an effective desorption.
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