performance of advanced oxidization uv/s2o^-2 8 in removing acid green 3 from aqueous solutions: modeling based linear regression, kinetic studies

Background: used in the dyeing industry, acid green 3 has a complicated molecular structure and a low level of biodegradability. the present study investigated the removal of acid green 3 from synthetic solutions by uv/s2 o8 -2 . methods: this cross-sectional study was conducted at the laboratory scale. the effect of time (5 - 60 min), ph (3 - 11), acid green 3 concentration (50 - 150 mg/l), and dose of s2 o8 (10 - 50 mg/l) was studied under the uv radiation with 510 mj/cm2 intensity and 636 nm wavelength. spectrophotometer (wavelength of 636 nm) was used to measure remaining concentration of acid green 3 after each experiment. linear regression was used to create an appropriate linear model. results: results showed a removal percentage of 95% was achieved under the optimal conditions of the studied variables: ph = 3, acid green 3 = 50 mg/l, s2 o8 -2 = 50 mg/l and time = 60 min. the kinetics of uv/s2 o8^ -2 process for all the investigated variables followed the pseudo-first-order kinetic model. in addition, the removal efficiency of cod for acid green concentrations of 50, 100, and 150 mg/l were about 78%, 53%, and 41%, respectively. linear regression analysis yielded a model with r2 = 0.852 and adjusted r2 = 0.792. conclusions: in the current study, the variables of acid green 3, s2 o8 -2 , contact time, and ph were effective on the process efficiency. regarding the high efficiency of uv/s2 o8^ -2 , this process could be employed for the removal of acid green 3 and similar compounds from industrial effluents.