ENIVRONMENT ASIA

Volume 12, No. 02, Month MAY, Year 2019, Pages 32 - 48

Elimination of cr(vi) in laboratory wastewater using chitosan coated magnetite nanoparticles (chitosan@fe3o4)

Phetlada Sanchayanukun, and Sasithorn Muncharoen

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Chromium (Cr) is one of the heavy metals that has adverse effects on the environment especially Cr(VI). Thus, the chitosan coated magnetite nanoparticles (chitosan@Fe3O4) as the adsorbent was developed for removal of Cr(VI) in this work. Several factors influencing for chitosan coating on the nanoparticles such as amount of chitosan and crosslinking reagent including volume and cross-linkage time were studied. Additionally, adsorption isotherms for adsorption of Cr(VI) on chitosan@Fe3O4 were investigated also. The results showed that adsorption capacity of the proposed adsorbent with optimal coating conditions was 16.94 ± 0.41 mg/g. In addition, it was found that adsorption isotherm of chitosan@Fe3O4 was correspondence with Langmuir isotherm. For adsorption and desorption study, the optimal pH was 2 with 120 min adsorption time while optimal eluent for desorption was 0.1 M NaOH with 180 min desorption time. Moreover, chitosan@ Fe3O4 could be reused for Cr(VI) removal at least 5 times. Furthermore, the proposed chitosan@ Fe3O4 was applied for Cr(VI) elimination in laboratory wastewaters. The results obtained that all laboratory wastewaters after treatment by chitosan@Fe3O4 passed the wastewater quality standards of Pollution Control Department (PCD) in Thailand.

Keywords

Chitosan; Nanoparticles; Chromium; Wastewater; Metal removal

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