Application of imino diacetate functionalized poly (methyl methacrylate) in a portable syringe system for the removal of malachite green from different water system

Abstract

A novel solid phase microextraction in a portable syringe system (SPME-PSS) was developed for removal of malachite green (MG) by using UV-Vis spectrometric determination. A long narrow column (100 cm × 5 mm i.d.) of having 10 mg of iminodiacetate functionalized polymethyl methacrylate (PMMA-ida) connected with a syringe system as an adsorbent medium to enhanced the contact area two medium (solid and liquid), which significantly increase adsorption of MG from aqueous medium to adsorbent. The surface morphology of PMMA-ida was characterized by FT-IR, 1H NMR, DSC and SEM techniques. The adsorption behavior of MG toward PMMA-ida was carried out by applying kinetic, thermodynamics and isotherms studies. The Langmuir and Freundlich's isotherms were used to point out the adsorption mechanism and the adsorption capability of the PMMA-ida. The monolayer adsorption capacity (qmax) of MG toward PMMA-ida was found to be 250.5 mg/g for MG. The proposed adsorbent could be recycled 10 (adsorption/desorption cycles) successfully without any decrease of regeneration capability. The kinetic study was also carried out and found that a higher R2 and good qe values shows the reaction follows pseudo-second-order kinetic. The adsorption was further conformed to be favorable from the Kf and 1/n values (1/n>0.1). The ∆G° (-6.762678) predict that the reaction is spontaneous and viable and the ∆H° (5.33315298) values show that reaction should be endothermic, whereas ∆S° (25.0018608) values show randomness adsorption behavior. We used a multivariate optimization approach for the optimization of extraction parameters. We also centroid simplex mixture of the mixture design to point out the best elution solvent of desorption cycles. The CCD of the response surface method was used to elevate the key factors (pH, final amount of PMMA-ida and (adsorption/desorption cycle). The analytical capability was also checked and found to be a linear response with (r) ≥ 0.9976 at a concentration range 10–100 ng L−1. LOD and RSD values were found 0.055 µg L−1 and 4.1 %. The spiking addition method was used to check the validity of the SPME-PSS method. The SPME-PSS method was successfully applied to water samples for the determination of MG.