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)]

• Published in: Malaysian Journal of Analytical Sciences
• Main Author: Zolekafeli Z.; Sambasevam K.P.; Baharin S.N.A.
• Format: Article
• Language: English
• Published: Malaysian Society of Analytical Sciences 2023
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85183418624&partnerID=40&md5=807f0d02e0a38f3e905315228d48ef02

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. © 2023, Malaysian Society of Analytical Sciences. All rights reserved.