Malaysian Journal of Analytical Sciences Vol 25 No 6 (2021): 966 - 976

 

 

 

 

ADSORPTION OF ACID ORANGE 7 BY CETYLTRIMETHYL AMMONIUM BROMIDE MODIFIED OIL PALM LEAF POWDER

 

(Penjerapan Asid Oren 7 oleh Setiltrimetil Ammonium Bromida Ubahsuai Serbuk Daun Kelapa Sawit)

 

Nik Ahmad Nizam Nik Malek^1,2*, Nurul Ain Sallehhuddin¹, Auni Afiqah Kamaru³

 

¹Department of Biosciences, Faculty of Science

²Centre for Sustainable Nanomaterials (CSNano), Ibnu Sina Institute for Scientific and Industrial Research (ISI-ISIR)

Universiti Teknologi Malaysia, 81310 JohorBharu, Johor, Malaysia

³Geomatika University College,

Prima Peninsula, Jalan Setiawangsa 11, 54200 Kuala Lumpur

 

*Corresponding author:  niknizam@utm.my

 

 

Received:  29 August 2021; Accepted: 28 October 2021; Published:  27 December 2021

 

 

Abstract

The capability of oil palm leaf (OPL) and surfactant modified oil palm leaf (SMOPL) to remove acid orange 7 (AO7) anionic dye in an aqueous solution was studied. The SMOPL was prepared by treating the OPL with different concentrations of cetyltrimethyl ammonium bromide (CTAB) solutions (1.0, 2.5, and 4.0 mM). The samples were characterized using Fourier-transform infrared (FTIR) spectroscopy and dispersion behaviour test. The FTIR results showed the modification of OPL with CTAB surfactant did not change the chemical structure of the OPL, except for an increase in the intensity of the C-H bond, which occurred due to the hydrocarbon group in CTAB. In addition, the effects of initial AO7 concentrations on the adsorption capacity of SMOPL were studied, and the highest AO7 adsorption capacity was found for the SMOPL4.0 with the initial CTAB concentration being 4.0 mM. Comparatively, the raw OPL demonstrated the lowest adsorption capability. The presence of the CTAB surfactant molecules on the samples increased the adsorption site of the adsorbent, allowing more attachments of dye molecules onto the OPL adsorbent. The Langmuir and Freundlich isotherm models were used to describe the adsorption isotherm. The equilibrium data were better fitted by Langmuir isotherm with a maximum AO7 adsorption capacity of 138.89 mg/g. Thus, it is suggested that the adsorption of AO7 takes place as a single monolayer on a homogeneous OPL surface. From this study, it can be concluded that the modification of OPL with cationic surfactant can enhance its adsorption process of anionic dye from an aqueous solution.

 

Keywords:  adsorption, oil palm leaf, cetyltrimethyl ammonium bromide, acid orange 7, surfactant

 

Abstrak

Keupayaan daun kelapa sawit (OPL) dan daun kelapa sawit yang diubah suai surfaktan (SMOPL) untuk menyingkirkan pewarna anionik asid oren 7 (AO7) dalam larutan akues telah dikaji. SMOPL disediakan dengan merawat OPL dengan kepekatan larutan setiltrimetilammonium bromida (CTAB) yang berbeza (1.0, 2.5, dan 4.0 mM). Sampel dicirikan dengan menggunakan spektroskopi inframerah transformasi Fourier (FTIR) dan ujian tingkah laku penyebaran. Hasil FTIR menunjukkan pengubahsuaian OPL dengan surfaktan CTAB tidak mengubah struktur kimia OPL, kecuali beberapa peningkatan keamatan untuk ikatan C-H yang berlaku disebabkan oleh kumpulan hidrokarbon yang terdapat pada CTAB. Kesan kepekatan AO7 awal pada kapasiti penjerapan SMOPL dikaji, dan kapasiti penjerapan tertinggi AO7 dijalankan untuk SMOPL4.0 di mana kepekatan CTAB awal adalah 4.0 mM. Secara perbandingan, OPL menunjukkan kemampuan penjerapan yang terendah. Kehadiran molekul surfaktan CTAB pada sampel meningkatkan tapak penjerapan, yang memungkinkan lebih banyak interaksi molekul pewarna ke OPL. Model isoterma Langmuir dan Freundlich digunakan untuk menggambarkan isoterma penjerapan. Data keseimbangan lebih baik dipadankan oleh isoterma Langmuir dengan kapasiti penjerapan maksimum AO7 adalah 138.89 mg/g. Jadi, penjerapan AO7 terhasil sebagai satu lapisan tunggal pada permukaan OPL yang homogen. Dari kajian ini, dapat disimpulkan bahawa modifikasi OPL dengan surfaktan kationik dapat meningkatkan proses penjerapannya untuk pewarna anionik dari larutan berair.

 

Kata kunci:  penjerapan, daun kelapa sawit, setiltrimetilammonium bromida, asid oren 7, surfaktan

 

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