無機聚合物吸附重金屬之研究

A Study on Heavy Metals Adsorption Using Geopolymer

李明霖(Ming-Lin Lee)

指導教授 ： 鄭大偉

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2007年)

摘要

多孔性固體常被用作吸附劑使用，利用其結構特性與廢水中之吸附質反應﹐以回收或去除污染物﹐使廢水達到淨化的效果。常用的吸附劑有活性碳及沸石等，而本研究是以無機聚合物作為吸附劑，探討其對重金屬之吸附特性。以變高嶺石與鹼性溶液依照特定配比均勻混合後，置於常溫下硬化成形為無機聚合物。經過破碎等預處理後，取一定粒徑範圍，分別針對重金屬溶液（Pb2+、Cu2+、Cr3+及Cd2+）進行吸附試驗，以不同操作變數探討無機聚合物對重金屬吸附之影響。研究結果顯示，無機聚合物具有吸附重金屬特性，在低濃度、高pH值及溫度條件下，可達到較高之去除率，其中尤以Pb2+之吸附效果最佳，實驗結果較符合Langmuir方程式。此外，無機聚合物之吸附能力會受到其製作配比而有所改變，提高SiO2/Al2O3及鹼性溶液SiO2/M2O莫耳比可增加其吸附效果，而溶解NaOH水量以70 mL製成無機聚合物之重金屬去除率較高。另一方面，改變變高嶺石焙燒溫度及持溫時間，亦會對重金屬吸附造成影響。因此，若配合適當的操作條件，將來可應用於廢水處理，為環境污染開創另一解決之道。

關鍵字

無機聚合物 ； 吸附 ； 重金屬

並列摘要

The porous material is often used as adsorbent, such as zeolite, silica gel, and clay. This research work is using geopolymer to treat heavy metals, discussing its adsorptive characteristics. Geopolymers were made from metakaolin, alkali solution and sodium silicate in certain wt% ratio. After cured in 25 ℃ oven, geopolymer was crushed and screened in order to obtain different particle size range to do the adsorption test for heavy metal individually. The experimental results show that geopolymer can adsorb heavy metals. With low initial concentration, high pH vaule, and high temperature, geopolymer can reach much higher removal efficiency, especially for Pb. Langmuir model has been employed to describe this experiment data. Various adsorption condition and different synthesis ways will change its adsorption capacity. Therefore, Geopolymer can be applied for waste water treatment in the future.

並列關鍵字

Geopolymer ； Adsorption ； Heavy metal

參考文獻

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