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Novel visible light-driven Cu-based MOFs/Ag2O composite photocatalysts with enhanced photocatalytic activity toward the degradation of orang G: Its photocatalytic mechanism and optimization study

Abstract

Present work is devoted to synthesis of two visible light-driven Cu-based metal organic framework (Cu-H3-btc, Cu-H2-bdc) composited with Ag2O nanoparticles (Cu-H3-btc-Ag2O-NPs and Cu-H2-bdc-Ag2O-NPs) which applied for photocatalytic degradation of orange G (OG) dye in the presence of blue light LED. Prepared photocatalysts successfully were characterized by FT-IR, SEM, EDS, UV-Vis DRS, PL, IES, XRD, TEM and HRTEM analysis. The obtained samples displayed superior photocatalytic activity due to the narrow band gap, good hole generation (OH radical generation) activity and low mass transfer resistance as well as the high surface area provided by the aggregation of Ag2O nanoparticles efficiently increased the escape probability of photogenerated electrons and the contact probability of photogenerated holes with outside MOF materials, assuring superb photocatalytic activity and excellent stability of as-prepared samples. The influence of operational factor such as initial OG concentration, solution pH, photocatalyst mass and irradiation time on the degradation efficiency as main and combination part were investigated by central composite design (CCD). The optimum condition for the photodegradation of OG by Cu-H3-btc-Ag2O-NPs was found to be at 6.0, 80 min, 4.5 mg/L and 0.022 g and by Cu-H2-bdc-Ag2O-NPs was found to be at 6.0, 80 min, 4.0 mg/L and 0.021 g/L corresponding to the pH, irradiation time, OG concentration and photocatalyst mass, respectively. At these optimum conditions, the photocatalytic degradation percentages of OG by Cu-H3-btc-Ag2O-NPs and Cu-H2-bdc-Ag2O-NPs with a desirability of 1.0 and 0.93 were 68.96% and 96.53%, respectively. The kinetics of understudy process successfully fitted to Langmuir–Hinshelwood (L–H) kinetics model, while apparent photocatalytic degradation rate constant (k r) and (K A) for Cu-H3-btc-Ag2O-NPs were determined as 0.139 mg L min−1 and 0.060 Lmg−1, respectively and Cu-H2-bdc-Ag2O-NPs were 0.081 mg L min−1 and 0.146 Lmg−1, respectively. The superb photocatalytic performance of as-prepared photocatalysts remained almost constant after reuse or exposure under visible light.

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Publication details

The article was received on 05 Sep 2017, accepted on 09 Apr 2018 and first published on 10 Apr 2018


Article type: Paper
DOI: 10.1039/C7NJ03245E
Citation: New J. Chem., 2018, Accepted Manuscript
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    Novel visible light-driven Cu-based MOFs/Ag2O composite photocatalysts with enhanced photocatalytic activity toward the degradation of orang G: Its photocatalytic mechanism and optimization study

    K. Dashtian, M. Ghaedi, M. M. Sabzehmeidani, E. Ameri and N. tabatabaei, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ03245E

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