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

 

Received: 8 November 2017/Accepted: 14 February 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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*Corresponding author; email: rozali@ukm.edu.my

 

 

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