Removal of methyl orange textile dye using magnetic chitosan microspheres adsorbent

Abstract

Industrial textile wastewater contains high levels of dyes, which are potentially harmful to aquatic ecosystems by inhibiting sunlight penetration for photosynthesis activities. Adsorption is a simple method for pollutant removal for water treatment. Magnetic Chitosan Microspheres (MCM) has been developed as a natural adsorbent for dye removal. This study aimed to compare the properties of the raw adsorbent and after adsorption by FT-IR, BET, DLS, and SQUID Magnetometry. The adsorption behaviours were investigated by the influence of pH, contact time, and initial concentration on Methyl Orange removal. The result was MCM could eliminate MO until 93.60% at pH 7 with C0 100 mg L−1 in 5 min with an adsorption capacity of 187.21 mg g−1. Adsorption processes were also studied through the isotherm and kinetic. The isotherm showed a closer fit to the Langmuir model than the Freundlich model. The kinetic result showed the PSO model was more suitable than PFO. The research data using MCM for adsorption demonstrated excellent adsorption capability in terms of dye removal percentage and high adsorption capacity. Therefore, this material could be an effective adsorbent for the treatment of dye-containing wastewater. HIGHLIGHTS MO adsorption was studied using MCM.; Properties of MCM were characterized with FT-IR, BET, DLS, and SQUID magnetometry.; The percentage removal of MO dye using MCM was 93.60%.; The adsorption process follows the Langmuir isotherm and pseudo-second-order (PSO) kinetic model.; MCM showed faster MO removal and higher adsorption capacity when compared to other adsorbents.;

Keywords

• adsorption
• artificial wastewater
• chitosan
• magnetic chitosan microspheres
• magnetite
• methyl orange