Malaysian Journal of Analytical Sciences, Vol 27 No 5 (2023): 946 - 955

 

PHOTOCATALYTIC PERFORMANCE OF MOLYBDENUM DISULPHIDE-GRAPHENE OXIDE IN PERFLUOROOCTANOIC ACID (PFOA) DEGRADATION UNDER INDOOR LIGHT EMITTING DIODE (LED) IRRADIATION

 

(Prestasi Fotokatalitik Molibdenum Disulfida-Grafena Oksida dalam Degradasi Asid Perfluorooktanoik (PFOA) di bawah Penyinaran Diod Pemancar Cahaya Dalaman (LED))

 

Zulhatiqah Zolekafeli1, Kavirajaa Pandian Sambasevam1,2,3, Siti Nor Atika Baharin1,3*

 

1Advanced Materials for Environmental Remediation (AMER), Faculty of Applied Sciences, Universiti Teknologi MARA Cawangan Negeri Sembilan Kampus Kuala Pilah, 72000 Kuala Pilah, Negeri Sembilan, Malaysia

2Electrochemical Material and Sensor (EMas) Group, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia

3Advanced Biomaterials & Carbon Development (ABCD),

Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia

 

*Corresponding author: atikabaharin@uitm.edu.my

 

 

Received: 30 May 2023; Accepted: 7 September 2023; Published:  30 October 2023

 

Abstract

In this research, molybdenum disulphide-graphene oxide (MoS2-GO) was used as photocatalyst for the degradation of perfluorooctanoic acid (PFOA) under 12-watt light emitting diode (LED) irradiation. The photocatalyst performance was evaluated by a series of experiment; effect of contact time, trapping experiments and recyclability studies. Effect of contact time revealed MoS2-GO degraded PFOA with 80.77% at 120 equilibrium time. Langmuir-Hinshelwood (L-H) kinetic model was applied to study the kinetic model with (R2) of 0.8726 at half-life (t1/2) 2.31 h under LED light irradiation. The trapping experiment shows that photocatalytic process was dominant by •O2-, where •O2-, supported by proton ion (h+), is the major active species whereas •OH only played a minor part in the entire photocatalytic process. The recyclability study revealed the MoS2-GO can be reused for up to six cycles. The employed photocatalyst in the sixth cycle was analyzed using FTIR and the FTIR spectrum shows that the peak diminishes its intensity after reusability at peaks of 1300 cm-1 to 1800 cm-1 for carbonyl (C=O), epoxy, the C=C stretching mode and carbonyl (>C=O), 750 cm-1 to 1250 cm-1 indicates the S-S bond,  and at 3038 cm-1 that is attributed to the O-H stretching vibrations. Thus, this research proposed a performance evaluation of MoS2-GO as photocatalyst for photocatalytic degradation of PFOA under indoor LED light irradiation.

 

Keywords: molybdenum disulphide, photodegradation, perfluorooctanoic acid, light emitting diode

 

Abstrak

Dalam penyelidikan ini, molibdenum disulfida-grafena oksida (MoS2-GO) digunakan sebagai pemangkin foto untuk degradasi asid perfluorooktanoik (PFOA) di bawah penyinaran diod pemancar cahaya (LED) 12 watt. Prestasi pemangkin foto telah dinilai oleh satu siri eksperimen; kesan masa sentuhan, eksperimen perangkap dan kajian kitar semula. Kesan masa sentuhan mendedahkan MoS2-GO merendahkan PFOA dengan 80.77% pada 120 masa keseimbangan. Model kinetik Langmuir-Hinshelwood (L-H) telah digunakan untuk mengkaji model kinetik dengan (R2) sebanyak 0.8726 pada separuh hayat (t1/2) 2.31 h di bawah penyinaran cahaya LED. Eksperimen perangkap menunjukkan bahawa proses fotokatalitik didominasi oleh •O2-, di mana •O2-, disokong oleh ion proton (h+), adalah spesies aktif utama manakala •OH hanya memainkan peranan kecil dalam keseluruhan proses fotokatalitik. Kajian kebolehkitaran semula mendedahkan MoS2-GO boleh digunakan semula sehingga enam kitaran. Pemangkin foto yang digunakan dalam kitaran keenam telah dianalisis menggunakan FTIR dan spektrum FTIR menunjukkan bahawa puncak mengurangkan keamatannya selepas kebolehgunaan semula pada titik 1300 cm-1 hingga 1800 cm-1 untuk karbonil (C=O), epoksi, mod renggangan C=C dan karbonil (>C=O), 750 cm-1 hingga 1250 cm-1 mewakili ikatan S-S,  dan di titik 3038 cm-1 yang mewakili ikatan renggangan O-H. Oleh itu, penyelidikan ini mencadangkan penilaian prestasi MoS2-GO sebagai pemangkin foto untuk degradasi fotokatalitik PFOA di bawah penyinaran cahaya LED dalaman.

 

Kata kunci: molibdenum disulfida, fotodegradasi, asid perfluorooktanoik, diod pemancar cahaya

 

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