Photo Degradation of methylene blue in aqueous solution by a new Cu(II)-MOF based on diaminodiphenyl 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 Department of chemistry, Faculty of sciences, Hamedan branch, Islamic Azad University, Hamedan



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.