원문정보
초록
영어
Lignin/polyaniline (Lignin/PANI) composites were synthesized by chemical polymerization using aniline with Kraft lignin. The composites and raw materials were used as adsorbents to remove hexavalent chromium (Cr(Ⅵ)). The Cr removal efficiency of lignin was very low. However, the Cr removal efficiency of lignin/PANI composite was higher than that of lignin. When the composite was used as an adsorbent, lignin and polyaniline (PANI) removed Cr(Ⅲ). Furthermore, the PANI reduced Cr(Ⅵ) after reducing Cr(Ⅵ) to Cr(Ⅲ) by the PANI amine groups, which resulted in the efficient Cr removal. The Cr removal efficiency of the composite considerably decreased with a decrease of dosage, comparing with pure PANI. However, PANI_L4 (lignin-to-PANI ratio of 1:1) showed a excellent Cr removal efficiency similar to pure PANI. In all composites, the PANI particles were observed around the surface of the lignin. The interaction between the PANI amine group and the lignin hydroxyl group was resulted in X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy analyses.