Malaysian Journal of Analytical Sciences Vol 18 No 3 (2014): 592 - 603

REMOVAL OF METHYL RED FROM AQUEOUS SOLUTION BY ADSORPTION ON TREATED BANANA PSEUDOSTEM FIBERS USING RESPONSE SURFACE METHOD (RSM)

(Penyingkiran Metil Merah daripada Larutan Akues oleh Serapan Fiber Batang Pisang Yang Telah Dirawat Mengunakan Kaedah Permukaan Sahutan (RSM))

Zaida Rahayu Yet and Mohd Zulkhairi Abdul Rahim

Department of Chemical Engineering Technology,

Universiti Kuala Lumpur (Malaysian Institute of Chemical and Bioengineering Technology), Melaka, Malaysia

*Corresponding author: zaida@unikl.edu.my

Abstract

The effect of adsorbent dose, pH and contact times on the removal of Methyl Red (MR) from aqueous solution by using agriculture waste (NaOH treated banana pseudostem fibers) were studied. The influence of these parameters on the removal of Methyl Red was examined by using a response surface method (RSM). The experiment was conducted by combining three parameters: adsorbent dose (500-1500 mg/L), pH (2-8) dan contact time (5-75 minutes ). The Box-Behnken Design (BBD) in Response Surface Methodology (RSM) by Design Expert Version 8.0.4 (Stat Ease, USA) was used for designing the experiments. Results showed that the optimum conditions for removal of Methyl Red from an aqueous solution (100 mg/L) were as follows: adsorbent dose (1417.70 mg/L), pH (2.08) and contact time (42.94 minutes) with the value of a coefficient of determination, R² is 98.98 %. Meanwhile, the second-order polynomial equation indicates that pH and contact times mostly affect the removal of Methyl Red.

Keywords: response surface method (RSM), adsorption, methyl red

Abstrak

Dalam penyelidikan ini, kesan dos penyerap, pH larutan dan masa untuk membuang Methyl Merah dari larutan media menggunakan sisa buangan pertanian iaitu serat batang pisang yang telah dirawat dengan larutan Sodium Hydroxide (NaOH) telah dikaji. Kesan tiga faktor dalam pengurangan Methyl Merah telah dikaji menggunakan Kaedah Permukaan Sambutan (RSM). Eksperimen dijalankan dengan menggabungkan ketiga – tiga pemboleh ubah iaitu dos penyerap (500-1500 mg/L), pH larutan (2-8) dan masa tindakan (5-75 minit). Reka bentuk Box-Behnken (BBD) di dalam Kaedah Permukaan Sambutan (RSM) menerusi “Design Expert” versi 8.0.4 (Stat Ease, USA) telah digunakan untuk mereka bentuk eksperimen. Keadaan terbaik untuk membuang 100 mg/L Methyl Merah dari larutan media adalah seperti berikut: dos penjerapan (1417.70 mg/L), pH larutan (2.08) dan masa tindakan (42.94 minit) dengan nilai pekali penentu, R² sebanyak 98.98 %. Persamaan polinomial peringkat kedua diperolehi didapati pH larutan dan masa rawatan adalah paling memberi kesan terhadap pembuangan Methyl Merah dengan menggunakan fiber batang pisang yang telah dirawat.

Keywords: kaedah permukaan sambutan, serapan, metil merah

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