In this study, ultrasonic-assisted removed Congo red by MOF-5/ Cu as a metal-organic framework, making the adsorption process very fast. Ultrasonic has proven to be a handy tool in accelerating dyes' adsorption by enhancing the adsorbent's affinity and the adsorbent. MOF-5 synthesized the solvothermal method and then modified it by CuCl 2 in ambient conditions. Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Fourier Transform Infrared (FT-IR), Brunauer-Emmett-Teller (BET), and Thermogravimetric analysis (TGA) were used for the identification structure and morphology of MOF-5/Cu. Sonication had an essential role in shortening the adsorption time (2 min) of Congo red by enhancing the dispersion of adsorbent (MOF-5) in solution. Congo red concentration was measured with a UV-visible spectrometer apparatus. Optimal values of Congo red concentration, Dosage of MOF-5/Cu, time, and pH were obtained by Central composite design. According to the optimal parameters, the adsorption process was very rapid. Removal of Congo red happened with excellent adsorption capacity (357.42 mg g À 1 ). Also, the MOF-5/Cu was regenerating by acetone five-time and show good results. Repeatability of the adsorption process was carried out, and the Relative Standard Deviation (RSD) was obtained 1.85 %.

Today, energy‐environment concerns are crucial for humans. Environmental pollution will increase as a result of expanding the use of fossil fuels, nitrogen‐containing compounds (NCCs) of which cause destructive effects on the environment. In this study, adsorptive denitrogenation (ADN) was performed by adsorbing indole (IND) from model fuels and gasoline over Metal‐organic frameworks (MOFs) CuCl‐MIL‐47. The MIL‐47 was synthesized by the microwave method with modified CuCl. In the present study, the application of Central Composite Design (CCD) was evaluated in the ADN process optimization for the first time. The maximum adsorption capacity (Q0) CuCl‐MIL‐47 for indole (IND) was 769.2 mg/g. Herein, π‐complexation of IND with Cu has made a synergistic effect leading to an increase in Q0. Moreover, the reusability of CuCl‐MIL‐47 was confirmed through its regeneration via ethanol.

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