Malaysian Journal of Analytical Sciences, Vol 27 No 4 (2023): 728 - 739

 

MOLYBDENUM DISULFIDE FOR PHOTOCATALYTIC

DEGRADATION OF METHYLENE BLUE

UNDER FLUORESCENT LIGHT

 

(Molybdenum Disulfida Untuk Fotokatalitik Degradasi Metilena Biru

Di Bawah Cahaya Pendarfluor

 

Siti Nor Atika Baharin1, 2, Nurul Izzah Hashim1, Izyan Najwa Mohd Norsham1,

and Kavirajaa Pandian Sambasevam1,3*

 

1Advanced Material for Environmental Remediation (AMER) Research Group,

Faculty of Applied Sciences,

Universiti Teknologi MARA, Cawangan Negeri Sembilan, Kampus Kuala Pilah,

72000 Kuala Pilah, Negeri Sembilan, Malaysia

2Advanced Biomaterials & Carbon Development (ABCD),

Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia

3Electrochemical Material and Sensor (EMas) Group,

Universiti Teknologi MARA,

40450 Shah Alam, Selangor, Malaysia

 

*Corresponding author: kavirajaa@live.com

 

 

Received: 25 September 2022; Accepted: 20 May 2023; Published:  22 August 2023

 

Abstract

This work underlined the fluorescent light-driven photocatalytic degradation of methylene blue by using cauliflower-like molybdenum disulfide (MoS2). In this study, molybdenum disulfide (MoS2) was synthesized by using Teflon-stainless steel autoclave via the hydrothermal method. The synthesized MoS2 were comprehensively characterized using Fourier transform infrared (FTIR), UV-visible spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermal gravimetry analysis (TGA). The characterization studies reveal that the composites have been successfully synthesized in which a black precipitate was obtained. Degradation of methylene blue was conducted using the synthesized MoS2 under fluorescent light using response surface methodology (RSM) of three-factor-three-level Box-Behnken design (BBD). The parameters studied were MoS2 weight loading, contact time under fluorescent light, and methylene blue pH value. The most effective parameter observed in the degradation of methylene blue were weight loading, followed by contact time and pH. The results showed that the optimum condition for the degradation were with the parameters of 15mg of MoS2 weight loading, with pH 6.5 methylene blue, has the highest degradation percentage 99.93% with 120 minutes exposed time under fluorescent light for degradation.

 

Keywords: molybdenum disulfide, photocatalytic degradation, methylene blue, response surface methodology, Box-Behnken

 

Abstrak

Penyelidikan ini menggariskan degradasi fotokatalitik dipacu cahaya pendarfluor biru metilena dengan menggunakan molibdenum disulfida (MoS2) yang berbentuk kobis bunga. Dalam kajian ini, molibdenum disulfida (MoS2) telah disintesis dengan menggunakan autoklaf keluli tahan karat Teflon melalui kaedah hidroterma. MoS2 yang disintesis telah dicirikan secara komprehensif menggunakan inframerah transformasi Fourier (FTIR), spektroskopi boleh dilihat UV, pembelauan sinar-X (XRD), mikroskop elektron pengimbasan (SEM), dan analisis gravimetri terma (TGA). Kajian pencirian mendedahkan bahawa komposit telah berjaya disintesis di mana mendakan hitam diperolehi. Degradasi metilena biru telah dijalankan menggunakan MoS2 yang disintesis di bawah cahaya pendarfluor menggunakan metodologi permukaan tindak balas (RSM) reka bentuk Box-Behnken (BBD) tiga faktor-tiga peringkat. Parameter yang dikaji ialah pemuatan berat MoS2, masa sentuhan di bawah cahaya pendarfluor, dan nilai pH biru metilena. Parameter paling berkesan yang diperhatikan dalam degradasi metilena biru ialah pemuatan berat, diikuti dengan masa sentuhan dan pH. Keputusan menunjukkan bahawa keadaan optimum untuk degradasi adalah dengan parameter 15mg beban berat MoS2, dengan pH 6.5 metilena biru, mempunyai peratusan degradasi tertinggi 99.93% dengan 120 minit masa terdedah di bawah cahaya pendarfluor untuk degradasi.

 

Kata kunci: molibdenum disulfida, degradasi fotokatalitik, biru metilena, metodologi permukaan tindak balas, Box-Behnken

 

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