Evaluation of methylene blue adsorption properties
Absorption properties and the removal efficiency of MXene/AAC hybrids
was conducted and calculated by detecting the adsorbent dosage, initial
pH and initial concentration of methylene blue in the aqueous solution.
The aqueous liquid was methylene blue-water solution with the
concentration of methylene blue ranging from 50 mg/L to 2000 mg/L. For
each adsorption experiment, 10 mg MXene/AAC adsorbent was added into a
50 mL methylene blue solution and then ultrasonic-dispersed to form an
even and stable solution. The mixtures were oscillated at room
temperature for appropriate time intervals ranging from 10 min to 48 h
to calculate the kinetic adsorption. After that, the mixture was
filtered to remove the residual adsorbent and the methylene blue
concentration of the dilute solution was analyzed30.
The adsorption capacity qe (mg/g) was calculated by
using the following equation:
\(q_{e}=\frac{(C_{0}-C_{r})\times V}{1000m}\) (1)
The adsorption percentage is calculated as followed equation:
\(\text{Removel\ }\left(\%\right)=\frac{(C_{0}-C_{r})}{C_{0}}\times 100\)(2)
Where C0 and Cr are the
initial and residual concentrations (mg/L) methylene blue, respectively;V is the solution volume (ml); and m (g) is the adsorbent
weight (g).
To confirm the optimum mass of MXene/AAC for maximum removal of
methylene blue from the mixture solution, different weight of MXene/AAC
hybrids ranging from 5 to 100 mg were tested. All the samples were
oscillated at room temperature.
To study the effect pH on the removal efficiency of methylene blue, a
series of experiments were conducted at different pH values ranging from
2-12 by adjusting with HCl or NaOH. The adsorption performance of the
adsorbent regenerated from 1-3 desorption recycles were evaluated,
respectively.