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

 

Received: 17 October 2015/Accepted: 16 March 2016

 

ABSTRACT

In this study, the adsorption efficiency of methyl violet (MV) dye onto Ce_0.3Al_0.7 and Ce_0.3Al_0.7Ag_x (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 Ce_0.3Al_0.7 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 Ce_0.3Al_0.7Ag_0.1 (R₂ = 0.7839), Ce_0.3Al0.7Ag_0.3 (R₂ = 0.9301) and Ce_0.3Al_0.7Ag_0.5 (R₂ = 0.9396) followed the Freundlich isotherm. The possible adsorption mechanisms of MV dyes onto the Ce_0.3Al_0.7 and Ce_0.3Al_0.7Agx 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 Ce_0.3Al_0.7 dan Ce_0.3Al_0.7Agx (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 Ce_0.3Al_0.7 dilihat mengikuti isoterma Langmuir (R₂ = 0.9951), menyediakan kapasiti penjerapan maksimum monolapisan 2.35 mg/g. Sebagai alternatif, penjerapan daripada pewarna MV ke dalam Ce_0.3Al_0.7Ag_0.1 (R₂ = 0.7839), Ce_0.3Al_0.7Ag_0.3 (R₂ = 0.9301) dan Ce_0.3Al_0.7Ag_0.5 (R₂ = 0.9396) diikuti isoterma Freundlich. Mekanisme penjerapan munasabah pewarna MV ke dalam Ce_0.3Al_0.7 dan Ce_0.3Al_0.7 Agx juga turut dibincangkan.

 

Kata kunci: Campuran oksida serium & aluminium; isoterma Langmuir; perak; pewarna metil ungu

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*Corresponding author; email: piawtee99@hotmail.com