Malaysian Journal of Analytical Sciences Vol 24 No 2 (2020): 266 - 275

 

 

 

 

ELECTROSYNTHESIS OF SILVER OXIDE DEPOSITED ONTO HOT SPRING MUD WITH ENHANCED DEGRADATION OF CONGO RED

 

(Elektrosintesis Perak Oksida Disokong Pada Lumpur Air Panas Dengan Peningkatan Degradasi Congo Merah)

 

Muhammad Farhan Hanafi, Ahmad Norsyazwan Mustafa, Norzahir Sapawe*

 

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: 18 February 2020

 

 

Abstract

AgO-supported hot spring mud (AgO-HSM) catalyst was prepared by introducing AgO onto HSM support through electrochemical method. The effect of preparation methods on the physical properties of the catalyst was studied. The interaction between silver species and HSM during the electrochemical process affected the AgO-HSM structure. The amount of 0.2 g L⁻¹ of 11 wt.% AgO-HSM was the optimum dosage for 10 mg L⁻¹ Congo red (CR), which resulted in 98.2% of maximum degradation after 2 hours of contact time at pH 5 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 were 172.41 mg L⁻¹ h⁻¹ and 0.005 L mg⁻¹, respectively. The measurements of the mineralization of CR by COD and BOD₅ analysis were 38.4% and 61.1%, respectively, before and after reaction. Therefore, AgO-HSM could be a promising catalyst for the degradation of various dyes in wastewater.

 

Keywords:  AgO-HSM, electrochemical, degradation, Congo red, light irradiation

 

Abstrak

Mangkin AgO yang disokong pada lumpur air panas (AgO-HSM) telah disediakan dengan memperkenalkan AgO ke atas sokongan HSM melalui kaedah elektrokimia. Kesan kaedah penyediaan sifat fizikal mangkin telah dikaji. Interaksi antara spesis perak dan HSM semasa elektrokimia didapati mempengaruhi struktur AgO-HSM. Sejumlah 0.2 gL^-1 dari 11% berat AgO-HSM didapati sebagai dos optimum untuk 10 mgL^-1 Congo merah (CR), yang mengakibatkan 98.2% degradasi maksimum selepas 2 jam masa sentuhan pada pH 5 di bawah cahaya pendarfluor. Kajian ini menunjukkan bahawa kesan kinetik mengikut model Langmuir-Hinshelwood dengan pseudo-pertama dengan nilai kiraan Kr dan K_LH masing-masing ialah 172.41 mgL^-1h^-1 dan 0.005 Lmg^-1. Pengukuran mineralisasi CR oleh COD dan BOD₅ adalah 38.4% dan 61.1%, sebelum dan selepas tindak balas. Oleh itu, AgO-HSM boleh menjadi mangkin yang menjanjikan degradasi pelbagai pewarna dalam air kumbahan.

 

Keywords:  AgO-HSM, elektrokimia, degradasi, Congo merah, penyinaran cahaya

 

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