Adsorption of methylene blue and hexavalent chromium by activated carbon preparation from Tectona grandis sawdust

• Main Authors: Chun-Chieh Chiu, 邱俊傑
• Other Authors: Huan-Ping Chao
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/2wczm5

碩士 === 中原大學 === 環境工程學系 === 106 === The objective of this study was to use Tectona grandis chips to produce activated carbon through two steps. First step, the wood chips are carbonized by hydrothermal synthesis. Second step, the samples were activated by two activation agents including K2CO3 and ZnCl2 with various ratios of wood against activation agent. The obtained samples were characterized by SEM, FTIR, XPS and BET surface area. Then, the activated carbons were used to adsorb MB and Cr(VI) under the various pH conditions. The synthesized adsorbents are expected to produce adsorbents with the high adsorption efficiency to remove contaminants and to achieve the purpose of reusing forest waste resources. From the results of SEM analysis, the activated carbons possess the rough surface and obvious pore volume. BET surface analysis indicated the surface area of WAC is 792 m2 g-1 and the surface area of ACK1075 and ACZ1175 is increased to 1013 m2 g-1 and 1757 m2 g-1 after chemical activation. The main element composite of the carbons involved C and O atoms through XPS analysis. The result in FTIR spectra demonstrated the primary functional groups are OH,C-O, C=C,C≡C and COOH. The results show that active carbon of ACK1075 and ACZ1175 can obtain the best adsorption efficiency for methylene blue and Cr(VI). The adsorption capacities of methylene blue for ACK1075 and ACZ1175 were 1429 mg/g and 1667 mg/g, respectively. The adsorption capacities of Cr(VI) at pH=3 for ACK1075 and ACZ1175 were 114 mg/g and 147 mg/g respectively.