Synthesis of activated carbon-nanomagnetite-pyrazolone(1-phenyl-3-methyl-5-pyrazolone) composite as adsorbent for Cd²⁺

Pyrazolone was impregnated onto activated carbon-nanomagnetite (AC-NM) composite and used as an adsorbent for cadmium (Cd(II)). AC-NM composite has been synthesized by hydrothermal method. The single phase of spinel magnetite and crystalinity of nanomagnetite (NM) and AC-NM composite were confirmed by X-ray diffraction (XRD). It has been found that the crystalinity of AC-NM composite was lower than NM. The synthesized activated carbon-nanomagnetite-pyrazolone (AC-NM-PZ) was characterized by Fourier Transform Infra-Red (FTIR). Moreover, the sorption capabilities for Cd(II) ions were evaluated by three adsorbent AC, AC-NM, and AC-NM-PZ. The pH range, adsorption time, and adsorbent dosage were optimized by Response Surface Method (RSM). Cd(II) ions sorption process was studied and evaluated by two adsorption isotherms and found to follow the Langmuir model. A value of 20.64 µmol/g was identified as the maximum sorption capacity of AC. AC-NM composite was found to increase the sorption capacity to be 36.73 µmol/g. The sorption capacity for AC-NM-PZ composite was 27.67 µmol/g, it was lower than KA-NM but higher than AC. (paper)