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

Diserahkan: 18 April 2024/Diterima: 11 Julai 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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*Pengarang untuk surat-menyurat; email: mw_haniff@upm.edu.my