| Abstrakt: |
This research is a development research to synthesize Cu(II) selective ion adsorbent material. The material developed is nanomagnetite coated with carboxymethyl kappa-carrageenan (CMKC) which is crosslinked with citric acid, and Cu(II) ions are printed on its surface. This study also tested the performance of the adsorbent to determine the optimum contact time and selective adsorption capacity of Cu(II). This research was carried out in three steps, (1) nanomagnetite synthesis, (2) CMKC synthesis, (3) CMKC coating on nanomagnetite, Cu(II) ion printing and crosslinking with citric acid (C6H8O7), spectral characterization using Fourier Transform Infra-Red (FTIR), crystallinity by X ray Diffraction (XRD), and analysis of adsorption ability using Atomic Adsorption Spectrophotometer (AAS). The results show that nanomagnetite has been successfully synthesized by coprecipitation from a mixture FeSO4.7H2O dan FeCl3.6H2O with NaOH as a reactant. The XRD diffractogram shows a peak of 29.8°, 35.47°, 43.26°, 56.97°, and 62.83°, and the peaks of the FTIR absorption spectrum appeared at 582.19 cm−1 and 448.04 cm-1, the average diameter of the synthesized material grains was 32 nm. The spectral and morphological character data above confirm the formation of CMKC nano magnetite synthesized from kappa carrageenan reacted with NaOH and monochloroacetic acid, the formation of CMKC has been confirmed by FTIR spectrum analysis which proves the conversion of hydroxyl groups in k-carrageenan to carboxyl groups. The synthesized nano magnetite was coated with CMKC, printed with Cu(II) ions and crosslinked with citric acid, this process produced an adsorbent with an average diameter of 63 nm, the surface texture was folded. The adsorbent has an adsorption capacity of 5.5715 mg Cu(II)/g, with an optimum adsorption contact time of 60 minutes. The layer on the surface of the adsorbent became scaly and cracked after being used for the Cu(II) ion adsorption process, which was followed by desorption with HNO3. [ABSTRACT FROM AUTHOR] |
