of the nanoribbons are in the range of a few nanometres upon the completion of
nucleation and can increase to thousands of nanometres following growth process.
The thickness of each nanoribbon is determined to be 5 nm [50]. The composite
hydrogel has high adsorption capability against crystal violet (CV), methylene blue
(MB) and radioactive iodine. Figure 6.15b presents the adsorption profile against
CV and MB, in which three adsorption stages are clearly identified including 0–3,
3–11 and 11–20 h. By fitting the curves as first-order kinetic processes, the kinetic
adsorption rates are calculated. The adsorption behaviour against radioactive iodine
is different from those against CV and MB (Fig. 6.15c). The adsorption rate for
iodine reaches high values during the first 3 h of the adsorption process.
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