In this paper, the removal of benzotriazole (BTA) was investigated by a Photo-Fenton process using nano zero valent iron (NZVI) and optimization by response surface methodology based on Box-Behnken method. Effect of operating parameters affecting removal effi ciency such as H 2 O 2 , NZVI, and BTA concentrations as well as pH was studied. All the experiments were performed in the presence of ultraviolet radiation. Predicted levels and BTA removal were found to be in good agreement with the experimental levels (R 2 = 0. 9500). The optimal parameters were determined at 60 min reaction time, 15 mg L -1 BTA, 0.10 g L -1 NZVI, and 1.5 mmol L -1 H 2 O 2 for Photo--Fenton-like reaction. NZVI was characterized using X-ray diffraction (XRD), transmission electron microscope (TEM) images, and scanning electron microscope (SEM) analysis.

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