Malaysian Journal of Analytical Sciences Vol 24 No 2 (2020): 227 - 235

 

 

 

 

ELECTROBIOSYNTESIS OF NiO USING RAMBUTAN LEAVES FOR PHOTODEGRADATION OF REMAZOL BRILLIANT BLUE DYE

 

(Elektrobiosintesis NiO Menggunakan Ekstrak Daun Rambutan Untuk Fotodegradasi Pewarna Remazol Brilliant Biru)

 

Muhammad Farhan Hanafi, Noor Faizah Che Harun, Norzahir Sapawe*, Azizzami Raidin

 

Universiti Kuala Lumpur Branch Campus

Malaysian Institute of Chemical and Bioengineering Technology,

Lot 1988 Vendor City, Taboh Naning, 78000 Alor Gajah, Melaka, Malaysia

 

*Corresponding author:  norzahir@unikl.edu.my

 

 

Received: 28 April 2019; Accepted: 16 February 2020

 

 

Abstract

NiO catalyst was prepared through electrochemical method with rambutan (Nephelium lappaceum) leaves as an electrolyte. The effects of the preparation methods on the physical properties of the catalyst were studied via Fourier transform infrared spectroscopy (FTIR). The interaction between nickel species and bio-active compounds of rambutan leaves crude during the electrochemical was found to affect the NiO structure. An amount of 3.0 g L⁻¹ of NiO was found to be the optimum dosage for 10 mg L⁻¹ of Remazol Brilliant Blue (RBB) dye, which resulted in 83.7% of maximum degradation after 1 hour of contact time at pH 3 under fluorescent light. This study showed that the kinetics followed a pseudo-first order Langmuir–Hinshelwood model with the calculated values of K_r and K_LH at 1.38 mg L⁻¹ h⁻¹ and 0.03 L mg⁻¹, respectively. Measurements of the mineralization of RBB by COD and BOD₅ analysis were 66.6% and 73.4%, respectively, before and after reaction. Therefore, the effectiveness of synthesized NiO by the electrobiosynthesis method was established and confirmed through this study. The synthesized NiO has a great potential as a photocatalyst in photocatalytic reaction for wastewater treatment.

 

Keywords:  electrobiosynthesis, nickel, remazol brilliant blue dye, degradation, light irradiation

 

Abstrak

Mangkin NiO disediakan melalui kaedah elektrokimia dengan ekstrak daun rambutan (Nephelium lappaceum) sebagai elektrolit. Kesan kaedah penyediaan ke atas sifat fizikal mangkin telah dikaji melalui spektroskopi inframerah transformasi Fourier (FTIR). Interaksi antara spesies nikel dan sebatian bio-aktif dari ekstrak daun rambutan semasa elektrokimia didapati mempengaruhi struktur NiO. Sejumlah 3.0 gL^-1 NiO didapati sebagai dos optimum untuk 10 mgL^-1 pewarna Remazol Brilliant Biru (RBB), yang menghasilkan 83.7% degradasi maksimum selepas 1 jam masa kontak di pH 3 di bawah lampu pendarfluor. Kajian ini juga menunjukkan bahawa kinetik mengikuti model Langmuir-Hinshelwood dengan pseudo pertama dengan nilai kiraan K_r dan K_LH masing-masing adalah 1.38 mgL^-1h^-1 dan 0.03 Lmg^-1. Pengukuran mineralisasi RBB oleh COD dan BOD₅ adalah 66.6% dan 73.4%, sebelum dan selepas tindak balas. Oleh itu, keberkesanan sintesis NiO dengan kaedah elektrobiosintesis telah ditubuhkan dan disahkan melalui kajian ini. NiO yang disintesis mempunyai potensi besar sebagai fotokatalis dalam tindak balas fotokatalitik untuk rawatan air sisa.

Kata kunci:  elektrobiosintesis, nikel, pewarna remazol brilliant biru, degradasi, penyinaran cahaya

 

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