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Sains Malaysiana 45(10)(2016):
1477–1485 Characteristics and Performance of a Mesoporous
Cerium-Aluminum-Silver Mixed Oxide for Removal of Methyl Violet
Dye (Pencirian dan Prestasi Campuran Oksida
Mesoberliang Serium-Aluminum-Perak untuk Menanggalkan Pewarna
Metil Ungu) PHATAI, P.1*
& SRISOMANG, R.2 1Department of Chemistry, Faculty
of Science, Udon Thani Rajabhat University, Udon Thani, 41000
Thailand 2Polymer and Material Research Groups,
Faculty of Science, Udon Thani Rajabhat University Udon
Thani, 41000 Thailand Diserahkan:
17 Oktober 2015/Diterima: 16 Mac 2016 ABSTRACT In this study, the adsorption
efficiency of methyl violet (MV) dye onto Ce0.3Al0.7 and
Ce0.3Al0.7Agx (x
= 0.1, 0.3 & 0.5) mixed oxides was investigated. The properties
of mixed oxide were determined by X-ray diffraction (XRD),
Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy
(SEM), energy dispersive X-ray spectroscopy (EDX),
N2
adsorption-desorption isotherm, diffuse reflectance
UV-vis
spectroscopy (UV-vis DRS) and X-ray absorption near
edge structure (XANES). Characterization showed that
synthesized mixed oxide with fluorite has a pure cubic structure
of a mesoporous nature and a small grain size with rough surface.
Batch adsorption experiments were used to study parameters including
contact time and initial dye concentration. The results showed
that these parameters affected the degree of MV dye adsorption. The dye adsorption of mixed oxides attained
equilibrium at 120 min. The equilibrium adsorption data were analyzed
using Langmuir, Freundlich and Temkin isotherms. The adsorption
behavior of MV
dye onto Ce0.3Al0.7 was
found to follow the Langmuir isotherm (R2 =
0.9951), providing a maximum monolayer adsorptive capacity of
2.35 mg/g. Alternatively, the adsorption of MV dye onto Ce0.3Al0.7Ag0.1 (R2 =
0.7839), Ce0.3Al0.7Ag0.3 (R2 =
0.9301) and Ce0.3Al0.7Ag0.5 (R2 =
0.9396) followed the Freundlich isotherm. The possible adsorption
mechanisms of MV
dyes onto the Ce0.3Al0.7 and
Ce0.3Al0.7Agx were
also discussed. Keywords: Cerium
& aluminum mixed oxides; Langmuir isotherm; methyl violet
dye; silver ABSTRAK Dalam penyelidikan ini, kecekapan
penjerapan pewarna metil ungu (MV) ke atas Ce0.3Al0.7 dan
Ce0.3Al0.7Agx (x
= 0.1, 0.3 & 0.5) campuran oksida dikaji. Sifat campuran oksida
telah ditetapkan melalui pembelauan sinar-x (XRD), spektroskopi transformasi
Fourier inframerah (FTIR), mikroskop elektron imbasan (SEM),
spektroskopi serakan tenaga sinar-x (EDX), N2 penjerapan-penyahjerapan
isoterma, meresap pemantulan UV-vis spektroskopi (DRS
UV-vis) serta penyerapan X-ray berhampiran sisi
struktur (XANES).
Pencirian menunjukkan bahawa sintesis campuran oksida dengan fluorit
mempunyai struktur padu tulen bersifat mesoporous dan saiz kecil
bijirin dengan permukaan yang kasar. Kelompok penjerapan eksperimen
telah digunakan untuk mengkaji parameter termasuk hubungan masa
dan tumpuan awal pewarna. Hasil kajian menunjukkan bahawa parameter
ini menjejaskan tahap penjerapan pewarna MV.
Penjerapan pewarna daripada campuran oksida mencapai keseimbangan
pada 120 min. Keseimbangan penjerapan data dianalisis menggunakan
isoterma Langmuir, Freundlich dan Temkin. Perlakuan penjerapan
pewarna MV ke
dalam Ce0.3Al0.7 dilihat
mengikuti isoterma Langmuir (R2 = 0.9951),
menyediakan kapasiti penjerapan maksimum monolapisan 2.35 mg/g.
Sebagai alternatif, penjerapan daripada pewarna MV ke
dalam Ce0.3Al0.7Ag0.1 (R2 =
0.7839), Ce0.3Al0.7Ag0.3 (R2 =
0.9301) dan Ce0.3Al0.7Ag0.5 (R2 =
0.9396) diikuti isoterma Freundlich. Mekanisme penjerapan munasabah
pewarna MV
ke dalam Ce0.3Al0.7 dan
Ce0.3Al0.7 Agx juga
turut dibincangkan. Kata kunci: Campuran oksida serium & aluminium; isoterma Langmuir; perak;
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Chemical Engineering Journal 258: 218-228. *Pengarang untuk surat menyurat; email: piawtee99@hotmail.com
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