Sains Malaysiana 47(7)(2018): 1547–1556
http://dx.doi.org/10.17576/jsm-2018-4707-24
Sintesis MnO2
Lapisan Nipis
Poros menggunakan Templat Silika Alumina-Aptes: Aplikasi Penjerapan Pewarna
(Synthesis of Porous
Thin Layer MnO2 using Silica Alumina
- Aptes Template: Application of Dyes Adsorption)
SITI ZUBAIDAH
HASAN1,
ZUHAILIE
ZAKARIA1,
MOHAMED
ROZALI
OTHMAN1,2*
& MUHAMMAD
RAHIMI
YUSOP1
1School of Chemical Science and Food
Technology, Faculty of Science and Technology, Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
2Centre for Water Research and Analysis,
Faculty of Science and Technology, Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
Diserahkan: 8 November 2017/Diterima: 14 Februari 2018
ABSTRAK
Mangan oksida (MnO2)
poros nano
yang mempunyai morfologi lapisan nipis telah
disintesis dan
diaplikasikan sebagai penjerap pewarna sintetik komersial (remazol merah, eriokrom hitam dan metilena biru). Permukaan bahan silika alumina yang telah diubah suai dengan
3-aminopropiltrietoksisilana (APTES) digunakan
dalam proses sonokimia
pada suhu bilik
dengan kehadiran
0.1 M kalium permanganat (KMnO4)
untuk menghasilkan
komposit silika alumina-MnO2.
Penyingkiran templat dijalankan
untuk mendapatkan
MnO2 tulen bersaiz nano.
Spektrum
FTIR
menunjukkan kehadiran
getaran MnO2 dalam julat 400 - 600 cm-1 dan corak XRD menunjukkan kehadiran birnesit jenis MnO2.
Isoterma jerap-nyahjerap
N2 menunjukkan MnO2 tulen memiliki liang yang bersifat mesoporos iaitu 34.8 Å (± 0.4),
manakala luas permukaan
MnO2 ialah
252.8 m2/g. Penjerap MnO2 lapisan nipis yang diperoleh menunjukkan kebolehan menjerap pewarna eriokrom hitam dan metilena
biru masing-masingnya
sehingga 54% dan 99% serta kapasiti penjerapan masing-masing ialah 0.0024 dan 0.0077 mmol/g. Kedua-dua isoterma penjerapan eriokrom hitam dan metilena biru
oleh MnO2 masing-masing menepati ciri-ciri Langmuir dan Temkin. Sementara itu data kinetik
penjerapan eriokrom
hitam dan metilena
biru kedua-duanya
memenuhi tertib pertama pseudo.
Kata kunci:
Jerapan; logam
oksida; sonokimia
ABSTRACT
Nanoporous manganese
oxide (MnO2) with thin layer morphology has
been synthesized and applied as commercial synthetic dye absorbent
(remazol red, eriochrome black and
methylene blue). The modified surface alumina silica with 3-aminopropyltriethoxysilane
(APTES) is used in the sonochemical process at room temperature with the presence
of 0.1 M potassium permanganate (KMnO4)
to produce alumina silica-MnO2 composite.
Template removal is performed to get pure nanosized
MnO2. The FTIR spectrum shows the presence
of MnO2 vibrations
in the range of 400 - 600 cm-1 and XRD pattern
shows the presence of MnO2-birnessite. The N2 adsorption-desorption
isotherm shows that pure MnO2 has
a mesoporous pore of 34.8 Å (± 0.4), while the surface area is
252.8 m2/g.
The nanosized MnO2 with
thin layer morphology obtained shows the ability to absorb eriochrome
black and methylene blue dyes with the value of 54% and 99% and
adsorption capacity of 0.0024 and 0.0077 mmol/g,
respectively. Both the adsorption isotherm of eriochrome
black and methylene blue by MnO2 meets
the characteristics of Langmuir and Temkin,
respectively. Meanwhile, kinetic adsorption of both eriochrom
black and methylene blue meets the characteristics of pseudo first
order.
Keywords: Adsorption; metal oxide; sonochemical
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*Pengarang
untuk surat-menyurat;
email: rozali@ukm.edu.my