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Sains Malaysiana 53(9)(2024): 3125-3134
http://doi.org/10.17576/jsm-2024-5309-17
Methyl
Orange Dye Removal by Dimethylamine Functionalized Graphene Oxide
(Penyingkiran Pewarna Oren Metil oleh Dimetilamina Grafin Oksida Berfungsi)
SEW HUI JUEN, NOOR NAZIHAH BAHRUDIN, NUR AMILAH
FADLINA BASRI & MOHD HANIFF WAHID*
Department
of Chemistry, Faculty of Science, Universiti Putra
Malaysia, 43400 UPM Serdang, Selangor, Malaysia
Received: 18 April 2024/Accepted: 11 July 2024
Abstract
Graphene oxide (GO) functionalized with
dimethylamine (DMA) was successfully prepared using a facile technique. GO was
first synthesized using the modified Hummers method, followed by chemical
functionalization with DMA in the presence of an electrophilic linker, i.e., epichlorohydrin (ECH). FTIR analysis of the end product
ascertains the successful synthesis of GO as well as its functionalization with
DMA. Typical characteristic peaks attributed to GO and DMA are clearly
discernible in the spectrum. The effect of pH, adsorbent dosage, dye
concentration, and contact time towards methyl orange (MO) dye removal was
studied and reported herein. In summary, enhanced adsorption of methyl orange
was observed for DMA functionalized GO compared to GO alone. 90% removal was
observed with 10 mg/L of MO concentration, pH = 2 at temperature 25 °C and 5 mg
of adsorbent. Modelling study shows that the pseudo-second-order kinetic model
and Freundlich isotherm model provide better fitness
to the experimental data.
Keywords: Adsorption; dimethylamine; graphene
oxide; methyl orange
Abstrak
Grafin oksida (GO) difungsikan dengan dimetilamina (DMA) telah berjaya disediakan dengan menggunakan teknik yang mudah. Pada permulaan, sintesis GO telah dilaksanakan menggunakan teknik Hummers terubah suai, diiringi oleh pemfungsian kimia dengan DMA dengan kehadiran linker elektrofilik, epiklorohidrin (ECH). Analisis FTIR ke atas produk membuktikan
keberhasilan sintesis GO dan juga pemfungsian dengan DMA. Puncak tipikal GO dan
DMA kelihatan jelas di dalam spektra. Kesan pH, dos penjerap, kepekatan pewarna
dan masa sentuh terhadap penyingkiran pewarna metil jingga (MO) telah dikaji
dan dilaporkan di sini. Secara keseluruhannya, peningkatan penjerapan metil
jingga dapat disaksikan bagi penjerap GO berfungsian DMA berbanding GO sahaja.
90% penyingkiran telah diperhatikan dengan kepekatan MO 10 mg/L, pH = 2 pada
suhu 25 °C dan 5 mg bahan penjerap. Kajian model kinetik menunjukkan bahawa
model pseudo-tertib-kedua dan isoterma Freundlich memberikan keserasian yang
lebih kepada data uji kaji.
Kata kunci: Dimetilamina; grafin oksida; metil
jingga; penjerapan
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*Corresponding author; email: mw_haniff@upm.edu.my
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