改質生物碳含氧化錳鐵用於吸附水溶液中重金屬離子

本文對改質前與改質後的生物碳之吸附表現比較和機制作探討。首先，10種生物碳將一同進行重金屬離子吸附測試。依照吸附得知的結果來看，未改質之生物碳的吸附能力較差(10.38-23.64mg Cu2+/g )，然而在進行氧化錳鐵MnFe2O4改質之後，其改質後將會帶有磁性，可被磁鐵吸引。在進行錳鐵含量測試時得知，改質後的生物碳之錳鐵之比值皆約為1:2，由此可證MnFe2O4確實被搭載在生物碳上。然而生物碳在經過改質之後，比表面積皆有顯著上升(0.16-5.42m2/g 上升至30.69-61.12 m2/g )。從並且在重金屬污染物容易中吸附能力有所提升(32.68-43.10g Cu2+/g)。在改質之後吸附能力約有65%至246%的增幅。綜合上述，氧化錳鐵的生成增加了吸附點的數量，例如：羥基-OH、羧基O-C=O以及氧化金屬Fe-O / Mn-O。由於這些官能基在改質後的生物碳表面產生了表面錯合及離子交換，故此加強了吸附汙染物的表現。另一方面，在經過了三次的回收測試後，氧化錳鐵改質後的生物碳仍可以保有原有吸附能力的約60%。這展現了氧化錳鐵改質之生物碳是可重複利用、環境友善以及符合經濟效益的材料。

關鍵字

生物碳；氧化錳鐵；磁性；重金屬；吸附

並列摘要

This thesis discussed the adsorption ability and mechanisms of adsorption before and after biochar modification. First, Heavy metal adsorption tests were examined for 10 kinds of biochars. The result shows that pristine biochar illustrated worse adsorption capacity (10.38-23.64 mg/g for Cu2+) than after modification. However, biochar has magnetic can be attracted by a magnet after MnFe2O4(manganese ferrite) modification. The ratio of Mn/Fe of modified biochars is close to 1:2 indicating that the MnFe2O4 loaded on the surface of biochars. The specific surface area significantly increased after modification (0.16-5.42 m2/g to 30.69-61.12 m2/g). Moreover, the adsorption performance of heavy metal pollutants was improved after modification (32.68-43.10 mg/g for Cu2+). It had about 65%-246% increase in adsorption capacities after modification. In conclusion, MnFe2O4 modification of biochar increases the number of sorption sites such as hydroxyl groups -OH, carboxyl groups O-C=O, and metal oxide Fe-O / Mn-O. These functional groups enhance the adsorption capacity of pollutants due to complexation and cation exchange ocuccred on the surface of modified biochar. On the other hand, the reusability of MnFe2O4-biochars also have about 60% adsorption efficiency after 3 cycles. It showed that MnFe2O4-biochars is reusable, eco-friendly, and cost-effective material.

並列關鍵字

biochar ； manganese ferrite ； magnetic ； heavy metal ； adsorption

參考文獻

1. Cha, J.S., Park, S.H., Jung, S.C., Ryu, C., Jeon, J.K., Shin, M.C., Park, Y.K., Production and utilization of biochar: A review. Journal of Industrial and Engineering Chemistry, 2016;40:1-15

Google Scholar

2. Weber, K., Quicker, P., Properties of biochar. Fuel, 2018;217:240-261

Google Scholar

3. Mohammad, I.A.W., Abdulrasoul, A.O., Ahmed, H.E.N., Mahmoud, N., Adel, R.A.U., Pyrolysis temperature induced changes in characteristics and chemical composition of biochar produced from conocarpus wastes. Bioresource Technology, 2013;131:374-379

Google Scholar

4. Cantrell, K.B., Hunt, P.G., Uchimiya, M., Novak, J.M., Ro, K.S., Impact of pyrolysis temperature and manure source on physicochemical characteristics of biochar. Bioresource Technology, 2012;107:419-428

Google Scholar

5. Mašek, O., Brownsort, P., Cross, A., Sohi, S., Influence of production conditions on the yield and environmental stability of biochar. Fuel, 2013;103:151-155

Google Scholar

國際替代計量

改質生物碳含氧化錳鐵用於吸附水溶液中重金屬離子

未授權

主題瀏覽