Photodegradation of methylene blue in aqueous solution by a new Cu(II)-MOF based on diamino diphenyl sulfone ligand through response surface methodology (RSM)

Document Type : Original Research Paper


1 Department of chemistry, Faculty of sciences, Arak branch, Islamic Azad University, Arak, Iran

2 chemistry Department, Sciences Faculty, Hamedan Branch, Islamic Azad University, Hamedan, Iran

3 Department of chemistry, Faculty of sciences, Hamedan branch, Islamic Azad University, Hamedan, Iran



A novel metal-organic framework (MOF), with the formula [Cu(II)L]n (L= 4, 4′-diamino diphenyl sulfone), has been synthesized conventionally and hydrothermally methods and characterized by FT-IR, PXRD, EDX, and SEM techniques. The results MOFs were applied for photodegradation of Methylene
Blue (MB). The influence of affecting variables, such as initial MB dye concentration (2–8mg L−1), Cu(II)-MOF mass (0.01–0.03 mg), pH (3.0–9.0), and time of irradiation (30–90 min). The photocatalytic degradation efficiency was investigated by the central composite design (CCD) methodology. The results of CCD analysis for optimum values of variables revealed that Cu(II)-MOF mass was 0.025g, the
initial concentration of MB was 3.51 mg L−1, pH was 4.50, and irradiation time was 75 min. Under the optimum conditions, the photocatalytic MB degradation percentage at the desirability function value of 1.0 was found to be 70%. In addition, the obtained R2 value of 0.97 in the regression analysis showed a high photocatalytic efficiency of the proposed method for MB degradation.