Photocatalytic Removal of Malachite Green and Brilliant Blue Dyes from its Aqueous Solution: A Case Study of Factorial Experimental Design

  • Zainab Haider Mussa Universiti Teknologi Malaysia
  • Fouad Al-Qaim University of Babylon
  • Ali Yuzir Universiti Teknologi Malaysia
  • Kamyar Shameli Universiti Teknologi Malaysia
Keywords: Malachite green dye, factorial experimental design, photocatalytic process

Abstract

Abstract. In this present study, the investigation of the photocatalytic removal of malachite green and brilliant blue dyes from their aqueous solution using photocatalytic oxidation process was provided. The application of factorial experimental design for the analysis the results was the main objective in the present study. The photocatalytic removal of Malachite Green (MG) and Brilliant Blue (BB) dyes was carried out in aqueous solutions containing the dye and suspended of ZnO upon UV irradiation (high pressure mercury lamp Radium 125 W). The effect of different factors such as initial dye concentration, sample volume and treatment time was taken in account. All samples of MG and BB have been analysed at 617 and 620 nm, respectively. The linearity ranged between 5 and 50 mg/L for MG dye while it was ranged between 20 and 200 mg/L for BB dye. The linear regression, R2, was more than 0.995 for both dyes. The results revealed that factorial experimental design analysis has given a better indication to investigate the effects of factors. It was observed that the most of factors are significant for both dyes. Initial concentration and treatment time factors were the most significant factors for MG and BB dyes, respectively according to pareto chart.

 

Resumen. En este estudio se presenta una investigación sobre la remoción fotocatalítica de colorantes de verde de malaquita y azul brillante de soluciones acuosas mediante procesos de oxidación fotocatalítica.  El objetivo principal de este trabajo fue la aplicación de un diseño experimental factorial para el análisis de los resultados.  La remoción del verde de malaquita (MG) y azul brillante (BB) de soluciones acuosas se llevó a cabo mediante irradiación de luz UV en presencia de partículas de ZnO en suspensión.  Para los experimentos, se usó una lámpara de mercurio a alta presión (Radium 125 W).  Se consideraron los efectos de distintas variables, como la concentración inicial de cada colorante, el volumen de la muestra y el tiempo de tratamiento.  Todas las muestras de MG y BB se analizaron a 617 y 620 nm, respectivamente.  Se observó linealidad en los resultados en el intervalo de concentraciones entre 5 y 50 mg/L para el caso de MG, mientras que para el BB la linealidad se observó en el intervalo de concentraciones entre 20 y 200 mg/L.  En ambos casos, los datos se ajustaron a modelos lineales con valores de R2 mayores a 0.995.  Los resultados revelaron que el diseño experimental factorial permite investigar de mejor manera los efectos de diversos factores, encontrándose que la concentración inicial y el tiempo de tratamiento son los factores más importantes para la remoción de MG y BB, respectivamente, según se muestra en los gráficos de Pareto.

Author Biographies

Zainab Haider Mussa, Universiti Teknologi Malaysia

Malaysia-Japan International Institute of Technology (MJIIT)

College of Pharmacy, University of Al-Ameed

Fouad Al-Qaim, University of Babylon

Department of Chemistry, Faculty of Science for Women, University of Babylon

Ali Yuzir, Universiti Teknologi Malaysia

Malaysia-Japan International Institute of Technology (MJIIT),

Kamyar Shameli, Universiti Teknologi Malaysia

Malaysia-Japan International Institute of Technology (MJIIT),

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Published
02-22-2021
Section
Regular Articles