جستجوی مقالات مرتبط با کلیدواژه "mn3o4" در نشریات گروه "پزشکی"

Polyvinyl alcohol is a persistent and water-resistant compound found in effluent of many industries and can be harmful to human health. Its presence in water supplies may cause problems in the process of settlings and removing heavy metals. This study aimed to determine the efficiency of Mn3O4 / H2O2 process to remove PVA.
This laboratory-scale research done to study the effects variables influencing process of Mn3O4/H2O2 including pH, hydrogen peroxide concentration, concentration of Mn3O4 nanoparticle, reaction time and concentration of PVA. To determine structural characteristics of nanoparticles XRD, BET SEM, and FTIR analyzes were used. Maximum absorption of contaminant by spectrophotometer was determined at 690 nm and the concentrations of PVA were determined by calibration curve.
BET analysis showed size of 19 nm for nanoparticles. Laboratory results showed that removal efficiency for Mn3O4/H2O2 process is 67.98% at; pH=3, Mn3O4 concentration= 0.4 g/l, concentration of hydrogen peroxide=20 mmol/l, reaction time=120 minutes, initial concentration PVA=100 mg/l. Removal efficiency decreased by increasing initial concentration of PVA and maximum efficiency of 71% observed for Mn3O4/H2O2 processes at initial concentration of 25 mg/l. UV radiation increased the efficiency of the process to 100% after 40 minutes.
In accordance with the results hydrogen peroxide activated by Mn3O4 catalyst is a suitable option for pre-treatment of waste water containing polyvinyl alcohol.