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Sains Malaysiana 43(3)(2014):
437–441
Synthesis and Photocatalysis of ZnO/γ-Fe2O3 Nanocomposite in Degrading Herbicide 2,4-dichlorophenoxyacetic Acid (Sintesis dan Fotokatalisis ZnO/γ-Fe2O3 dalam
Mendegradasi Herbisid Asid 2,4-diklorofenoksiasetik)
LEE KIAN MUN1, ABDUL HALIM ABDULLAH2*, MOHD
ZOBIR
HUSSEIN2 & ZULKARNAIN ZAINAL2
1Department
of Chemistry, Faculty of Science, Universiti Putra Malaysia 43400
Serdang, Selangor, Malaysia
2Advanced
Materials and Nanotechnology Laboratory, Institute of Advanced Technology,
Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
Diserahkan:
17 April 2013/Diterima: 12 Julai 2013
ABSTRACT
ZnO/γ-Fe2O3 catalysts were
fabricated via a simple precipitation route using zinc acetate and iron acetate
as the precursors and ammonia as the precipitant. The resulted nanocatalysts
were subjected to heat treatment at 450°C for 2 h. The characteristics of the nanocomposite were
investigated by various characterization techniques. The synthesized
nanocomposite has an average particle size of 13 nm and a surface area of 17 m2/g.
The photocatalytic activity of ZnO/γ-Fe2O3 nanocomposite was
evaluated by photodegrading 2,4-dichlorophenoxyacetic acid (2,4-D) under UV irradiation.
The results showed that ZnO/γ-Fe2O3 nanocomposite exhibited
enhanced photoactivity compared to pure ZnO with almost 20% increment within 4
h of reaction time. The result indicated the applicability of ZnO/γ-Fe2O3 nanocomposite
to be used as photocatalyst in removing organic pollutants in wastewater.
Keywords: Photocatalytic degradation; precipitation; zinc oxide;
2,4-D
ABSTRAK
Mangkin ZnO/γ-Fe2O3 telah disintesis dengan
kaedah pemendakan dengan menggunakan zink asetat dihidrat dan ferum asetat
sebagai bahan pemula dan ammonia sebagai agen pemendak. Nanomangkin yang
dihasilkan dikalsin pada 450°C selama 2 jam. Ciri mangkin yang dihasilkan dikaji dengan
pelbagai analisis. ZnO/γ-Fe2O3 yang dihasilkan
mempunyai purata saiz zarah sebesar 13 nm dan luas permukaan sebanyak 17 m2/g.
Aktiviti fotopemangkinan bagi ZnO/γ-Fe2O3 yang disintesis telah
dinilai dengan mendegradasi asid 2,4-diklorofenoksiasetik (2,4-D) di bawah
radiasi cahaya ultraungu. Kajian menunjukkan bahawa peratusan penyingkiran
2,4-D oleh ZnO/γ-Fe2O3 melebihi ZnO sebanyak
20% dalam masa 4 jam. Ini menunjukkan ZnO/γ-Fe2O3 yang dihasilkan mampu
diaplikasikan sebagai fotomangkin untuk menyingkirkan pencemar organik dalam
air sisa.
Kata kunci: Fotokatalisis
degradasi; pemendakan; zink oksida; 2,4-D
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*Pengarang untuk surat-menyurat; email: halim@upm.edu.my
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