EPA-109-XB09

109

1,244 千元

補助及獎勵回收清除處理暨再生利用

2020/02/01

2020/11/30

席行正

回收基管會

蕭友淨

國立臺灣大學

廢棄物管理

汞蒸氣吸附、金電沉積、活性碳纖維布、程序升溫脫附

Mercury vapor adsorption, gold electrodeposition, activated carbon fiber cloth, temperature-programmed desorption

范致豪

蘇淑慧

02-33664398#

flyinfree1115@gmail.com

由於汞的高危害性，近年來各國法規對於含汞產品的使用皆提高處理限制，大量含汞產品如液晶顯示器中的螢光燈管進入回收體系，造成每年有大量的廢棄含汞螢光燈管需破碎回收；同時市面上仍存在無法取代金屬汞添加之產品，因此如何有效地去除並處理回收破碎過程中逸散的汞蒸氣具有其必要性。 本研究以臺炭科技股份有限公司生產之活性碳纖維布作為起始原料，利用電沉積的方式，於不同電沉積時間下，製備具有不同金含量之活性碳纖維布，並針對原始活性碳纖維布(Raw-ACFC)與金電沉積碳纖維布(GE-ACFC)進行汞吸附及脫附實驗。結果顯示，金電沉積活性碳纖維布之飽和吸附量可由48 ± 5 μg/g (Raw-ACFC)提升最高至408 ± 13 μg/g (GE-ACFC)，其中以電沉積成長時間1200秒效果最佳，成長時間過長會使金沉積物太大並降低汞之接觸效率而減少汞吸附量，而Raw-ACFC之多孔纖維結構造成電阻分布不均，進而影響金沉積物之散佈；程序升溫脫附結果顯示活性碳纖維布的孔洞與氧官能基能夠以物理及化學形式吸附汞，汞以金汞齊的形式吸附於金電沉積活性碳纖維布上；後續利用電熱再生脫附設備在150、200和250oC進行三循環之電熱再生試驗，結果顯示GE-ACFC於不同再生溫度之吸附效率皆能穩定維持在90%以上，GE-ACFC對於汞之鍵結強度大於Raw-ACFC。

汞蒸氣吸附、金電沉積、活性碳纖維布、程序升溫脫附

期末報告公開版-上傳.pdf

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期末報告(公開版)

2021/2/1 上午 12:00:00

Owing to the high toxicity of mercury (Hg), the restriction of Hg-containing products in different countries is getting rigorous. The huge number of Hg-containing products such as fluorescent lamps of the liquid-crystal displays are discarded and need to be recycled. Because Hg in several commercial products is still indispensable, therefore, it is necessary to remove and recover Hg released during the disassembling process. In this study, activated carbon fiber cloth (ACFC) was produced by Taiwan Carbon Corp., which was used as the raw material (Raw-ACFC). The gold electrodeposited ACFCs (GE-ACFC) were successfully prepared under various electrodeposition periods. Physical and chemical characterizations of Raw-ACFC and GE-ACFC showed that the gold content of GE-ACFC increased with extending electrodeposition periods, nevertheless, the decrease in the pore volume and specific area of GE-ACFC due to pore blockage was also observed. We found that gold modification of ACFC could effectively improve Hg0 adsorption capacity of ACFC, however, the gold content did not always favor the Hg0 adsorption since excessive gold deposition might reduce the contact area between Au and Hg0, compromising Hg0 adsorption capacity of GE-ACFC. Gold-electrodeposited ACFC with the Au growth time of 1200 s (i.e., GE-ACFC-1200s) exhibited the largest Hg0 adsorption capacity. The results obtained from TPD showed that there were two major desorption peaks in Raw-ACFC, indicating Hg0 was physically adsorbed by pore structures and chemically adsorbed by oxygen functional groups. In contrast, the Hg adsorption of GE-ACFC appeared to be controlled by physical adsorption by Au amalgamation. The adsorption efficiency of GE-ACFC-1200s was above 90% and showed a high stability at different regeneration temperatures in 3-cycle electrothermal swing system experiments.

Mercury vapor adsorption, gold electrodeposition, activated carbon fiber cloth, temperature-programmed desorption