Removal of Malachite Green Dye From Aqueous Solutions Using Low Cost Biosorbents

Abstract

People have been coloring their clothes for centuries. Dyes have for newlinemillennia been used to alter the colours or hues of fabrics and obtained traditionally newlinefrom many natural sources such as roots, berries, bark, leaves and food materials etc. newlineThese naturally obtained dyes encounter various issues such as reproducibility of newlinecolour, sustainability and cost of production. With the creation of synthetic dyes, newlinethese problems have largely been overcome, as evidenced by the modern newlineomnipresence of cheap, colorful clothing. The constant development of textile and newlinepaper industry leads to increasing use of different types of synthetic dyes. Today newlinevarious dyes are available and used commercially. Unfortunately, during dying and newlinecoloration process some percentage of dyes goes to environment and is released into newlinewater causes contamination. Dyes contaminate water and fields, which can be really newlineharmful for human health. There are many ways and techniques people use to newlineremove dyes from the environment, but most of them are complicated and newlinesometimes not very effective. Among various technologies adsorption method gains newlinemuch attention. Applying the principles of green chemistry, adsorption shows its newlineefficiency by using low cost, environmental friendly adsorbents to remove these newlineharmful dyes from solution. Present study focus on the use of bark powder prepared newlinefrom Polyalthia longifolia, Psidium Guajava and Saraca asoca to remove malachite newlinegreen oxalate dye from aqueous solutions. The medicinal importance of these plants newlinewas studied through literature review and selection was done to study their bark newlinepowder for process of adsorption. False ashoka bark powder, guava bark powder and newlineashoka bark powder was prepared from bark of Polyalthia longifolia, Psidium newlineGuajava and Saraca asoca respectively and characterized through SEM, FTIR and newlineGC-MS techniques. Langmuir adsorption isotherms and Freundlich adsorption newlineisotherms were used to study batch adsorption isothermal process. Pseudo first order newlineand pseudo second order modeling was d