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Effect of Red Mud and Rice Husk Ash-Based Geopolymer Composites on the Adsorption of Methylene Blue Dye in Aqueous Solution for Wastewater Treatment
Effect of Red Mud and Rice Husk Ash-Based Geopolymer Composites on the Adsorption of Methylene Blue Dye in Aqueous Solution for Wastewater Treatment
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Date
2023
Authors
"Khoa Dang Nguyen,* Trang Tran Thu, Anh Thi Hoang Tran, Oanh Thi Kim Le, Suresh Sagadevan, and Noor Haida Mohd Kaus"
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Abstract
"In this study, geopolymer originating from locally industrial byproducts as red mud (RM) was successfully prepared
in the presence of different loadings of rice husk ash (RHA) used for the adsorption of methylene blue (MB) in wastewater. During
geopolymerization, various mixing amounts between RM and RHA were conducted when the weight ratio of binder solution/
activated alkali-metal solution (Na2SiO3/ NaOH 7 M) was 2.5 and the curing temperature was set at 60 °C for 24 h. As a result, the
surface area value of the prepared geopolymer composited with RHA at 0 and 60% was increased from 19.2 to 29.5 m2/g, while the
BJH pore size of the prepared geopolymer was reduced to 6.68 and 5.76 nm, respectively. In the dye removal test, higher additions of
RHA in the RM-geopolymer maintained better retention of the MB ion due to the increase in the adsorption binding site. The
maximum uptake amount of dyes performed at pH 8 was changed from 6.59 to 10.74 mg/g, while RHA was from 0 to 60% after 180
min of immersion in MB solution. The adsorption isotherms well obeyed the Langmuir model, as the relative coefficient R2 was
0.999. Based on these, the initial agricultural waste as RHA and industrial byproducts as RM were valued as functional materials used
for dye treatment in wastewater."