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PREPARATION AND CHARACTERIZATION OF RED MUD-BASED GEOPOLYMER COMPOSITED WITH RICE HUSK ASH FOR THE ADSORPTION OF BROMOCRESOL GREEN IN AQUEOUS SOLUTION
ISSN
1873-393X
Date Issued
2023
Author(s)
Khoa Dang NguyeN, Anh Thi Hoang Tran, Noor Haida Mohd Kaus
Abstract
"1 Geopolymer-based industrial waste as red mud
(RM) was successfully obtained in the presence of
different loadings of rice husk ash (RHA). During the
preparation, the added amounts of RHA in the
geopolymer composition were varied from 10 to 50 %
when the mass ratio of binder solution (Na2SiO3) and
activated alkali-metal solution (NaOH 7 M) were 2.5 and
the curing condition was fixed at 333 K within 24 h. For
characterization, the surface morphology was evaluated
by scanning electron microscope (SEM) equipped with
the energy-dispersive X-ray, which detected the distri bution of elements before and after the geopolymerization.
To indicate the formation of geopolymer, Fourier–
transform infrared spectroscopy (FT-IR) was used. The
effect of the loading amounts of RHA on the Brunauer–
Emmett Teller (BET) surface area value and Barrett–
Joyner–Halenda (BJH) pore size of the obtained geo polymers were determined using a nitrogen gas adsorption
instrument. In the bromocresol-green (BG) adsorption
performed at pH 2, the higher addition of RHA in the
geopolymer composition enhanced the adsorption capaci ties within 180 minutes. In addition, the adsorption behav ior of the mixed geopolymer to BG fits well the Langmuir
model, indicating that the adsorption occurs on the homo geneous monolayer surface of geopolymer. From this
study, the RHA could be a natural potential filler to im prove the BG-uptake of RM-based geopolymer in waste water treatment."
(RM) was successfully obtained in the presence of
different loadings of rice husk ash (RHA). During the
preparation, the added amounts of RHA in the
geopolymer composition were varied from 10 to 50 %
when the mass ratio of binder solution (Na2SiO3) and
activated alkali-metal solution (NaOH 7 M) were 2.5 and
the curing condition was fixed at 333 K within 24 h. For
characterization, the surface morphology was evaluated
by scanning electron microscope (SEM) equipped with
the energy-dispersive X-ray, which detected the distri bution of elements before and after the geopolymerization.
To indicate the formation of geopolymer, Fourier–
transform infrared spectroscopy (FT-IR) was used. The
effect of the loading amounts of RHA on the Brunauer–
Emmett Teller (BET) surface area value and Barrett–
Joyner–Halenda (BJH) pore size of the obtained geo polymers were determined using a nitrogen gas adsorption
instrument. In the bromocresol-green (BG) adsorption
performed at pH 2, the higher addition of RHA in the
geopolymer composition enhanced the adsorption capaci ties within 180 minutes. In addition, the adsorption behav ior of the mixed geopolymer to BG fits well the Langmuir
model, indicating that the adsorption occurs on the homo geneous monolayer surface of geopolymer. From this
study, the RHA could be a natural potential filler to im prove the BG-uptake of RM-based geopolymer in waste water treatment."
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