Laser induced fluorescence detection of R6G dye adsorbed on Fe3O4 nanomaterials

This study investigates the comparison between magnetite nanoparticles loaded tea waste (MNLTW) and magnetite nanoparticles loaded reduced graphene oxide nanosheets (MNPs@rGO), as effective adsorbents for the removal of R6G dye from effluents. XRD, TEM, and SEM techniques were used to characterize the proposed adsorbents. The adsorption process was optimized under the parameters of initial concentration, contact time, pH, and the quantity of adsorbents. An amount of 0.15 g of both adsorbents removed about 87% of R6G by MNLTW and 65% by (MNPs@rGO) from 100 ml of a 23.95 mg/l concentrated solution in 40 and 60 min for MNLTW and (MNPs@rGO), respectively at pH 7. LIF measurements have developed better results than those of spectrophotometer. The isothermal analysis according to Langmuir isotherm was (R2  = 0.98) for (MNPs@rGO) and Temkin isotherm (R2 =  0.89) for MNLTW. The kinetic study is well described with a pseudo-second order model.