柚木製備活性碳吸附亞甲基藍和六價鉻之研究

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

邱俊傑(Chun-Chieh Chiu)

指導教授 ： 趙煥平

中原大學/工學院/環境工程學系/碩士(2018年)

https://doi.org/10.6840/cycu201800429

摘要

本研究主要利用柚木木屑做為起始原料，並將活性碳製備分為兩個步驟，第一步驟先將木屑原料以水熱合成法碳化，第二步驟再分別以K2CO3 與ZnCl2 兩種試劑，配合不同含浸比例再800oC下進行活化，所得之樣品經SEM、FTIR、XPS與BET表面積分析了解其表面性質，再利用合成樣品在不同 pH值得條件下吸附亞甲基藍與六價鉻
，期望製備具高吸附容量之吸附劑，並可達林業廢棄物資源再利用之目的。
研究結果顯示，經活化後的活性碳表面將較粗糙且具備明顯孔洞
，BET分析結果顯示為活化WAC 表面積為792 m2 g-1，經過化學活化後的 ACK1075及ACZ1175表面積分別提升至1013 m2 g-1及1757 m2 g-1，樣品經XPS分析主要元素成分為C與O，FTIR的結果則顯示OH、C-O、C=C、C≡C與COOH為主要表面官能基。ACK1075及ACZ1175之活性碳，對染劑亞甲基藍及六價鉻具有最佳吸附效果，亞甲基藍吸附量分別為1429 mg/g、1667mg/g。而六價鉻在pH=3時吸附量則分別為114 mg/g、147 mg/g。

關鍵字

柚木 ； 活性碳 ； 亞甲基藍 ； 六價鉻

並列摘要

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.

並列關鍵字

Tectona grandis ； activated carbon ； methyl blue ； dichromate

參考文獻

參考文獻

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