Utilizations of electro-coagulated sludge from wastewater treatment plant data as an adsorbent for direct red 28 dye removal

This work reported on the adsorptions of direct red 28 dye on to the raw and calcined electro-coagulated, EC, sludge adsorbents collected from the textile wastewater treatment plant. EC sludge adsorbent was prepared with wet treatment by deionized water and calcination at 500 °C. Raw and processed data on main adsorption operation parameters and adsorbent characterization were reported. Also, adsorption isotherm, adsorption kinetics; and thermodynamic models for direct red 28 dye (DR28) removal mechanism on to the raw and calcined EC sludge adsorbents were reported. Instrumental analysis, such as Fourier Transformation infrared spectrometer (FTIR) and Ultraviolet/Visible (UV/Vis) spectroscopy were used for adsorbent characterization and dye absorbance measurement before and after adsorption respectively. UV–Visible spectrometer was used throughout the batch experiment. The effect of adsorption temperature (25 ± 2 °C (ambient), 40 °C, 60 °C and 80 °C), pH (2, 4, 6, 8 and 10), initial dye concentration (20, 40, 60 and 80 mg/L), contact time (10, 20, 40, 60, 80 and 100 min) and adsorbent dosage (0.1, 0.5, 1, 1.5, 2 g/100ml) were examined. For EC sludge adsorbent characteristics, FTIR analysis data is provided as raw and processed data before and after dye adsorption for both raw and calcined EC adsorbent. UV–Vis spectral analysis before and after dye removal with a pH range of 2–10 and batch adsorption experimental data records such as initial dye concentration, solution pH, temperature, adsorbent dosage and mixing time are reported.