Preparation of magnetic chitosan for mercury removal from polluted water had been conducted. Magnetic particles (Fe 3 O 4) were isolated from local iron sand to provide magnetic properties of chitosan. Glutaraldehyde was used as crosslinking agent of chitosan. The obtained magnetic chitosan was characterized by using FTIR, TGA, DSC, XRD, and SEM. Adsorption experiments were conducted with various contact time, pH and initial concentration of mercury. The results showed glutaraldehyde and Fe 3 O 4 decreased crystallinity of chitosan. Low crystallinity of polymer is favorable for adsorption due to the high accessibility of adsorbate to reach active sites of adsorbent. FTIR and SEM confirmed the formation of magnetic chitosan. Based on correlation coefficient (R 2) values, the adsorption mercury by magnetic chitosan fitted with Langmuir and Freundlich isotherm models.

No abstract

No abstract

No abstract

Due to its limiting factor of the cycle-life on Zn-polyaniline (PANI) rechargeable battery, the surface morphology and electrochemical properties have been extensively investigated. However, there are no studies that found on the chemical structure of PANI electrode before and after used in the battery with spectroscopy. Here, the Zn-PANI Battery was tested through a 60-cycle discharging process using 10 mA fixed current. The Open Circuit Voltage (OCV) at this condition was ± 1.3 V. The Raman spectra at 488 nm on PANI discharge showed increasing intensity at 1495 cm -1 υ(C=N). Furthermore, the new peak appeared on the band at 1212 cm -1 υ(N=Q=N) and 1166 cm -1 υ(C-H), related to mode on the benzenoid ring. This investigation indicated the formation of Emerald in Bases (EB), caused by the consumption of protons by Zn metal during the filling process.