鐵氧化物吸附劑之開發與應用

Preparation and Utilization of Iron Oxide Adsorbent

吳佳正(C. C. Wu) ； 謝汶興(W. S. Hsieh) ； 王原璋(Y. C. Wang) ； 林財富(T. F. Lin) ； 鄭仲凱(C. K. Cheng)

《界面科學會誌》 27卷2期 (2005/06) Pp. 123-132

https://doi.org/10.30020/JCCIS.200506.0004

摘要

砷及其化合物長久以來便已知為自然界中含有之有害物質，其危害性已於許多臨床病例中得到驗證，因此在水處理工程上，除砷一直是許多研究的重點。近年來，鐵氧化物開始被大量使用於除砷上，故本篇之主旨即在於回顧整理文獻中之資料，探討鐵氧化物之基本表面特性，以及其去除砷之機制與效能。後繼之以實驗，以合成之不同鐵氧化物吸附劑對砷進行吸附，以測試其對去除水中砷之效果，並期達到降低含砷有害污泥產出。研究中分別合成出矽-鐵氧化物、磁性複合物以及吸附性矽藻土等三類吸附性濾材。在矽-鐵氧化物合成步驟中，是藉由調整矽酸-鐵鹽混合溶液之pH值，進而產出混合沉降物；磁性複合物則是以氫氧化鐵對磁性核心進行表面覆膜處理，而吸附性矽藻土則是經由天然矽藻土之覆膜改質而合成的。經過對含砷溶液中五價砷的吸附試驗後發現，此三種吸附性濾材均能表現出不錯的效能，再加上三者各有其技術操作上之優點，故值得繼續深入研究，以研發可推廣實務化之工業用材料。

關鍵字

鐵氧化物 ； 氫氧化鐵 ； 吸附 ； 矽藻土 ； 吸附性過濾 ； 五價砷

並列摘要

The hazardous arsenic compounds in the natural aqueous environment have caused many fatal human diseases. Thus, the removal of arsenic from water has been an important key point in the water treatment process for decades. Using iron oxide as adsorbent for this purpose became a new trend in this field, because of its high adsorption capacity. In this research work, both literature review and material development were carried out. Three new types of iron oxide based absorbents were prepared and then tested. The adsorbent SF was from co-precipitation of silicate and iron salt mix solution, while the adsorbent BAM was from a core of magnetite coated with FeOOH shell. Using a similar coating treatment with BAM, the adsorptive diatomite (DIA) was also prepared. These three adsorbents show reasonably high adsorption capacity for As(V). Besides, all the three adsorbents possess technical advantages under different conditions. Further development and improvement for these types of adsorbents are needed to provide better performance in field applications.

並列關鍵字

iron oxide ； iron hydroxide ； adsorption ； diatomite ； adsorptive filtration ； arsenic