In this article, cotton is modified by m- DMDHEU and choline chloride. The modified cotton can adsorb and ion exchange ion CrO4 2- , H2AsO4 - in water solution as effectively as anionit resin. The material are activated by soaking in 24 h with mixed m-DMDHEU and choline chloride, then dried and activated in 1 h at 140 oC, all residual reactants was removed by water. Adsorption and ion exchange process were studied with a model solution contained ion CrO4 2- , H2AsO4 - in different conditions. Results showed that the modified cotton is able to adsorb ion CrO4 2- , H2AsO4 - of the model, solution is nearly completely, respectively 99,95 % and 99,60 %; the values of anionit resin is respectively 97,99 % and 97,60 % at pH=7,0.
A new denaturation agent is the mixture
of 4,5-dihydroxy-1,3-bis(methoxymethyl)imidazolidin-2-one
(
m
-DMDHEU)/choline chloride (CC) introduced to modify
three kinds of lignocellulosic materials containing different lignin
contents in the following order: cotton used in medicine < sawdust
from
acacia auriculiformis
wood <
powder from the coconut shell. The modification process is carried
out through two main steps: 0.2 N NaOH solution with 70% v/v ethanol
and 30% v/v water was applied to remove lignin and activate the initial
raw materials, and then delignified materials were modified with
m
-DMDHEU/CC by using a parched heat supply method after
chemical impregnation. Structural characterictics and physicochemical
properties of modified materials were tested and dissected by scanning
electron microscopy, Fourier transform infrared spectroscopy, solid-state
13
C nuclear magnetic resonance spectroscopy (solid-state
13
C CP-MAS NMR), specific surface area, and pH at the point
of zero charge (pH
PZC
). The ability to adsorb and exchange
anions of modified materials was referred and examined by using aqueous
solutions containing CrO
4
2–
, NO
3
–
, and H
2
AsO
4
–
anions in different conditions. The results revealed that anionite
lignocellulosic materials could separate these anions with very good
efficiency and better than strong anion exchange resin (GA-13) in
the same conditions; outlet water could meet the permissible drinking
and living water standards; and the
m
-DMDHEU cross-link
bridge also was a good bridge to connect CC to cellulose chain beside
other common urea cross-link bridges.
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