Hi!
Several authors have use different terms in their adsorption studies - peanut shells, hulls and husks...
What is meant by "husk" - is it the same as "shell"?
And "hull" is even more confusing, as [far as I understand] it is the green part around hard shell of walnuts and almonds. So, what is peanut hull?
Thank you in advance!
Example of references:
(1) Banerjee, M.; Basu, R.K.; Das, S.K. Cu(II) removal using green adsorbents: Kinetic modeling and plant scale-up design. Environ. Sci. Pollut. Res. 2018, in press.
(2) Abdelfattah, I.; Ismail, A.A.; Sayed, F.A.; Almedolab, A.; Aboelghait, K.M. Biosorption of heavy metals ions in real industrial wastewater using peanut husk as efficient and cost effective adsorbent. Environ. Nanotechnol. Monit. Manag. 2016, 6, 176–183.
(3) Ali, R.M.; Hamad, H.A.; Hussein, M.M.; Malash, G.F. Potential of using green adsorbent of heavy metal removal from aqueous solutions: Adsorption kinetics, isotherm, thermodynamic, mechanism and economic analysis. Ecol. Eng. 2016, 91, 317–332.
Of course they are used synonymously as Hull and Husk are even defined by oxford dictionary' " the dry outer covering of some fruits or seeds" and that is clear from their adsorbent preparation as given in the three articles
Banerji: Peanut shells and almond shells were bought from the local market. Cleansing of these collected adsorbents was done by distilled water. Cleaned shells were then dried at 105 °C for 24 h to eliminate moisture. Dried adsorbents were then grounded and sieved to achieve the dimension of − 44 + 52 mesh (250–350 μm).
Ali: Natural peanut hulls low-value agricultural by-products, were collected from the local markets in Alexandria. ….. peanut hulls were crushed and grinded into powder. The powdered materials were screened to five different particle sizes (
I think it is use dependent the hulls are removed by the user either factory or farmers but considered waste
If they are synonyms in this case, why to confuse readers, as for other nuts (almonds, walnuts) hull is not the same as shell!?
Moreover, I have seen that husks=skins... "Remove the skins, also referred to as the husk by some"...
So, in the last reference (Abdelfattah) husks could mean both shells and skins... :/ Or should I assume that these are shells, because they do not remove skins in the farm, but in the factory after the farm?
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