University of Tehran Press Iranian Journal of Biosystem Engineering 2008-4803 50 2 2019 08 23 Isotherm, Kinetic and Thermodynamic of Methylene Blue Adsorption Using Synthesized ZnO Nanoparticles by Curcumin Isotherm, Kinetic and Thermodynamic of Methylene Blue Adsorption Using Synthesized ZnO Nanoparticles by Curcumin 427 437 72589 10.22059/ijbse.2019.269636.665117 FA Zahra Sayyar PhD student, Food Technology Department, Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran Hoda Jafarizadeh-Malmiri Associate Professor, Food Technology Department, Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran Journal Article 2018 11 19 ZnO nanoparticles (NPs) are effective adsorbents in removal of various organic and inorganic contaminants. In this study, ZnO NPs were synthesized using curcumin at 160 ° C and pH = 10 and used to degradation methylene blue at different initial concentrations and at different temperatures and pHs. Physical and morphological properties of the synthesized NPs were analyzed using XRD, DLS, SEM, FTIR and BET. Obtained results indicated that by increasing the temperature up to 40 °C, adsorption was initially increased to maximum amount of 320 mg/g and then decreased. Furthermore, maximum amount of adsorption was obtained by increasing in the pH (235 mg/g at pH=10). Results revealed that adsorption kinetics in order to dye remove was well fitted using a pseudo second-order kinetic model. The obtained results were also indicated that the Langmuir equation could be predicted the dye adsorption, better than the Freundlich equation, due to its higher R² (0.99) and R_L(0.564). According to the Langmuir equation, maximum adsorption capacity was 324 mg/g. The obtained values for the thermodynamic parameters were also indicated that the dye adsorption was an endothermic and spontaneous process. ZnO nanoparticles (NPs) are effective adsorbents in removal of various organic and inorganic contaminants. In this study, ZnO NPs were synthesized using curcumin at 160 ° C and pH = 10 and used to degradation methylene blue at different initial concentrations and at different temperatures and pHs. Physical and morphological properties of the synthesized NPs were analyzed using XRD, DLS, SEM, FTIR and BET. Obtained results indicated that by increasing the temperature up to 40 °C, adsorption was initially increased to maximum amount of 320 mg/g and then decreased. Furthermore, maximum amount of adsorption was obtained by increasing in the pH (235 mg/g at pH=10). Results revealed that adsorption kinetics in order to dye remove was well fitted using a pseudo second-order kinetic model. The obtained results were also indicated that the Langmuir equation could be predicted the dye adsorption, better than the Freundlich equation, due to its higher R² (0.99) and R_L(0.564). According to the Langmuir equation, maximum adsorption capacity was 324 mg/g. The obtained values for the thermodynamic parameters were also indicated that the dye adsorption was an endothermic and spontaneous process. https://ijbse.ut.ac.ir/article_72589_78d4bb577e491077ecfe9ee60450ade4.pdf