Kine tic and th ermodynamic study of Cr (III) Adsorption by Nano Organic-Ino rganic Adsorbent based on ۴ H-pyarn-۴-one (E۳) and TEO S by Sol-Gel Method.

Vario us technologies are e mployed for removing toxic ions from water, witch include chemical precipitation, reverse osmosis, ion-flotation, evaporation, ion-exchange and adsorp tion among this adsorption is the most promising technique. The adsorption of Cr (III)onto nano-E۳ are studied as a function of contact time, pH, Ionic strength, adsorbe nt mass, and temperature. Kinetic data indicated that adsorption process achiev ed equilibr ium with in ۳۰ min and follows a pseudo-second-order rate equation, theadsorp tion data fit the Langmuir model and its linearized form well, together with thermodynamic d ata indicate the spontaneous and endother mic nature of process. We synthe sis new podands of ۴ H-pyran-۴-one deivatives that show ed in scheme۱. Then, these comp ounds were heterogenized as nano adsorbent by using sol-gel method in acidic catalyst condition in TEOS as a subs trate. These nano adsorbent prepared based on ۴H-pyran-۴one derivatives showed the good p erformance to uptake of heavy metals, such as Cr (III).

کلیدواژه ها:

Nano adsorbent ، Sol-Gel ، ۴H-pyran-۴one ، Cr (III)