The Usage of Red Mud and Black Nickel Mud for Removal of Methylene Blue

toxic to their adverse effects on many forms of life. Adsorption is the
most comprehensively used technology due to simplicity, low cost,
and effectiveness for removing dyes from water solution. This article
discusses the use of adsorbents from waste metal production - red
mud (RM) and black nickel mud (BNM) for methylene blue removal
from water solution. RM was obtained from Žiar n. Hronom
(Slovakia) - waste from aluminium oxide production from the abovementioned ash pond and BNM was supplied from the waste landfill
in Sereď (Slovakia) - waste from nickel production. The adjusted
samples were used as adsorbents in different test conditions, such as
time and temperature of sorption and amount of sorbent samples. The
experiment was done at the varied amount of sorbent 0.2, 0.4 and 0.6
g per 75 ml of sorptive with a fraction of adsorbent particles <
500 μm. The solution of methylene blue was prepared with a
concentration of 50 mg/L. The sorption process was realised by
various conditions. The temperature of sorption was 25 °C, 40 °C and
60 °C and the contact time of the sorbent with the sorptive was 1, 2,
3, 24 and 48 hours. From the obtained data, we can claim the best
removal efficiency at 60℃ for RM (83.01-83.72% after 48 h)
regardless of the amount added to the methylene blue solution. We
can conclude that after appropriate treatment, both of these low-cost
adsorbents can be an interesting alternative to remove methylene blue
using sorption under the right conditions.