• Bisphenol A is classified as a toxic and priority hazardous compound; it is required to be degraded prior to discharging the contaminated streams to the environment. Therefore, the purpose of this study is investigation of Bisphenol A adsorption by biomass agricultural waste Rice straw.

Material and methods: This study was performed in laboratory at batch scale. The effects of different parameters including contact time, pH, Bisphenol A initial concentration and biomass dosage were studied for removal of Bisphenol A. All experiments were repeated triplicate and then adsorption isotherms and kinetics of different models were analyzed by comparing the coefficient of determination. The concentration of Bisphenol A was measured by HPLC.

Results: The results indicated that by increasing of contact time and dose of adsorbent the amount of bisphenol adsorption increases, so that by increasing contact time from 10 to 75 min, the adsorption increased from 38.3% to 96.9% and by increasing adsorbent dosage from 1 to 5 gr/L adsorption increased from 35.5% to 94.9%. The adsorption was increased by decreasing of initial concentration of bisphenol A and the pH of 3 was the best for bisphenol A removal. The adsorption data was best fitted to the Freundlich isotherm and pseudo-second order kinetic model.  The Langmuir equation and pseudo- second order model showed the best fit for the experimental data

Conclusion:  The results showed that the agricultural waste Rice straw can be used as a high efficiency and inexpensive adsorbent for  treatment of industrial effluent.