Abstract
Propionic acid modified bagasse was used for the removal of reactive yellow 2 and reactive blue 4. The effects of pH, contact time, initial dye concentrations, adsorbent particle size and adsorbent dose on the adsorption of the two dyes were investigated. Additionally, the desorption process and intra-particle diffusion were studied. Acidic pH values were favorable for adsorption of both dyes. The equilibrium adsorption data were best fitted with the Freundlich isotherm for reactive yellow 2 and the Langmiur isotherm for reactive blue 4. The values of their corresponding constants were determined. The kinetic for dye adsorption is well described by a pseudo-first order kinetic model for the reactive yellow 2 and by pseudo-second order for the reactive blue 4. The investigation revealed that the hydroxyl groups of bagasse and the carboxylic group of propionic acid play a great role in the removal of both reactive dyes.
Highlights
Dyes are widely used in many industries such as textile, plastic, paper, food and cosmetic for coloring their products
The investigation revealed that the hydroxyl groups of bagasse and the carboxylic group of propionic acid play a great role in the removal of both reactive dyes
Modified bagasse by propionic acid is an effective biosorbent for the removal of both reactive yellow 2 and reactive blue 4 dyes from wastewater
Summary
Dyes are widely used in many industries such as textile, plastic, paper, food and cosmetic for coloring their products. There are various methods for removing dyes including coagulation and flocculation [1], oxidation or ozonation [2] and membrane separation [3]. These processes are very expensive and cannot be effectively used to treat the wide range of dyes waste. Alternative methods include adsorption on natural biosorbents which are becoming of high interest for removal of dyes from waste effluents. In this way several studies have used natural materials locally available, renewable and of low costs [4,5,6]. The selection of bagasse for this study was based on low cost raw material and environmental impact
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