利用電子廢棄物回收銅製備催化劑進行染料降解之研究利用電子廢棄物回收銅製備催化劑進行染料降解之研究

Synthesis of copper oxide from electronic waste for the catalytic wet peroxide oxidation of methylene blue

羅芝兒(Velasquez Ma. Rozelle)

指導教授 ： 游勝傑 ； 王雅玢

中原大學/工學院/生物環境工程研究所/碩士(2016年)

https://doi.org/10.6840/cycu201600630

摘要

銅和其他貴金屬已經被廣泛應用在電及電子材料，但是由於創新，材料是微型規模，所以這些產業過時產品的廢棄物也一直增加，因此，從中回收貴金屬的需求也增加。隨著產業廢水中有毒汙染物越來越多，因此去除這些汙染物的技術發展已經是許多環境研究機構所著重的焦點。
本研究利用電及電子廢棄物回收之銅廢料製成催化劑，通過濕式過氧化氫氧化降解亞甲基藍染料。催化劑採用簡單的水熱法製備，在過氧化氫(H2O2)的幫助下將銅氧化成氧化銅，反應器可以控制溫度以促進合成產物和過氧化氫之羥基自由基的生成。
從結果得知，以硝酸酸浸銅廢棄物可以得到最佳恢復效果，也可以得知，從廢棄物中的銅合成氧化銅經過反應器控制溫度為45ºC，對濃度為50 mg/L亞甲基藍水溶液可降解99%，而從商用銅合成之氧化銅可以降解98%。從FTIR結果根據相關文獻一致表明，在626及531 cm-1處分別有Cu2O及CuO的振動峰。

關鍵字

銅 ； 催化降解 ； 電子廢棄物

並列摘要

Copper and other precious metals have been widely used in electrical and electronic materials however due to innovation, as materials are made in miniature scale, wastes of the outdated products from these industries have been increasing; thus, the need to recover precious metals from it are also increasing. Toxic contaminants in wastewater from industries have also been increasing therefore development of technologies to remove it have been a great focus of environmental research institutions.
In this study, copper waste was recovered from electronic and electrical wastes to produce a catalyst that can be used to degrade methylene blue dye via catalytic wet hydrogen peroxide oxidation. The catalyst was prepared by simple hydrothermal method. The oxidation was done with the aid of hydrogen peroxide (H2O2) to react with copper oxide, the reactor was utilized with controlled heat to encourage the production of hydroxyl radicals from the synthesized product and H2O2.
From the results of leaching copper waste it was found that HNO3 has given the best recovery for copper leaching. It has been found that the synthesized copper oxide, that used copper obtained from the waste, can degrade up to 99% of 50 mg/l of methylene blue solution after 45 minutes in a controlled reactor with a temperature of 45 ○C while the copper oxide made from commercial copper has degraded 98%. The results of FTIR has shown agreement with other related literatures, showing vibrational peaks of Cu2O and CuO at around 626 and 531 cm-1, respectively.

並列關鍵字

Copper ； copper waste ； electronic waste ； catalytic wet peroxide oxidation

參考文獻

[1] Diaz, L.A., et al., Comprehensive process for the recovery of value and critical materials from electronic waste. Journal of Cleaner Production, 2016. 125: p. 236-244.

[2] Cayumil, R., et al., Concentration of precious metals during their recovery from electronic waste. Waste Management.

[3] Zhan, Y., et al., Catalytic wet peroxide oxidation of azo dye (Direct Blue 15) using solvothermally synthesized copper hydroxide nitrate as catalyst. Journal of Hazardous Materials, 2011. 187(1–3): p. 348-354.

[4] Zhan, Y., H. Li, and Y. Chen, Copper hydroxyphosphate as catalyst for the wet hydrogen peroxide oxidation of azo dyes. Journal of Hazardous Materials, 2010. 180(1–3): p. 481-485.

[5] Cui, J. and L. Zhang, Metallurgical recovery of metals from electronic waste: A review. Journal of Hazardous Materials, 2008. 158(2–3): p. 228-256.