電漿改質吸附材對於重金屬去除成效之研究

Heavy metal removal by plasma modified adsorbent

陳志超(Chih-Chao Chen)

指導教授 ： 林龍富

共同指導教授 ： 呂明和(Min-Her Leu)

崑山科技大學/工程學院/環境工程研究所/碩士(2008年)

https://doi.org/10.6828/KSU.2008.00056

摘要

本研究係利用常溫電漿改質吸附材，在功率1000 W氣體壓力200 mtorr之操作條件下，藉由氧、氮、氬三種不同氣體及不同處理時間進行廢輪胎橡膠粒、活性碳、沸石等吸附基材之電漿改質，可藉此瞭解不同基材所需的最佳電漿參數及吸附條件。
經電漿改質後之吸附材分別浸漬於不同濃度之NaOH水溶液中進行前處理，探討其對提升吸附材去除重金屬的影響。同時，並應用(Scanning Electron Microscope, SEM)與( Brunauer Emmett Teller Sorptometer, BET)進行表面特性分析，了解基材表面經電漿改質後變化情形，而藉由(Fourier Transform Infrared Spectroscopy, FTIR)可分析出改質後基材表面官能基鍵結的差異，確證電漿改質成效。
在廢輪胎橡膠粒的部份，以氧電漿改質60秒之處理效果最佳，其單一重金屬Cu、Pb、Ni之吸附量分別可達2.87、 4.02及 1.56 μmol/g；混合重金屬Cu、Pb、Ni之吸附量分別可達2.38、 0.51及0.32μmol/g，而經由NaOH處理後無顯著之成效，反而會破壞橡膠粒原本之表面特性，使得吸附效率降低。
而在活性碳的部份，以氮氣電漿改質60秒之處理效果最佳，其單一重金屬Cu、Pb、Ni之吸附量分別可達45.50、60.73及35.82 μmole/g；混合重金屬Cu、Pb、Ni之吸附量分別可達49.24、44.69及3.95μmole/g，另經由1N 之NaOH處理後， 對於單一重金屬Cu、Pb、Ni 的去除率可分別提升至98.33、97.44及81.03%；混合重金屬Cu、Pb、Ni 的去除率可分別提升至83.16、82.87及8.64%。
最後在沸石部分，以氧氣電漿改質60秒之處理效果最佳，其單一重金屬Cu、Pb、Ni之吸附量可達0.85、3.75及2 .61μmole/g。從以上數據可以看出，吸附材經電漿改質即有明顯之效果。

關鍵字

電漿改質 ； 吸附材 ； NaOH ； 重金屬去除

並列摘要

This study focused on heavy metal removal by plasma modified adsorbent, including rubber, activated carbon and zeolite. The adsorbents were modified with O2, N2, and Ar plasma at a condition of 1000W of power, 200 mtorr of air pressure, and different reaction time, in order to look into the best plasma parameters and conditions for the adsorption.
The plasma modified adsorbents were impregnated in different concentrations of NaOH solution as a pretreatment, to investigate the effect on the removal of heavy metals. Meanwhile, the difference of surface characteristics of plasma modified adsorbents were analysed application of Scanning Electron Microscope (SEM) and Brunauer Emmett Teller Sorptometer (BET), by an the differences of functional-bond were analysed by Fourier Transfoorm Infrared Spectroscopy (FTIR) to confirm the effectiveness of plasma modification.
For tire rubber, oxygen plasma to 60 seconds has the best performance on heavy metal removal. A single heavy metal Cu, Pb, and Ni adsorption volume of up to 2.87, 4.02, and 1.56μmol/g, respectively and mixed heavy metals Cu, Pb, and Ni adsorption volume of up to 2.38, 0.51, and 0.32μmol/g, respectively； but there is no significant imporement for NaOH pretreatment, it will damage the surface structure of rubber granules.
For the case of activated carbon, nitrogen plasma to 60 seconds has the best performance on heavy metal removal. A single heavy metal Cu, Pb, and Ni adsorption volume of up to 45.50, 60.73, and 35.82μmol/g, respectively and mixed heavy metals Cu, Pb, and Ni adsorption 49.24, 44.69, and 3.95μmol/g, respectively； on the other hand, activated carbon treated with 1 N NaOH will enhance the heavy metal removal. A single heavy metal Cu, Pb, and Ni removal efficiency was increased to 98.33, 97.44, and 81.03% and mixed heavy metals Cu, Pb, and Ni removal efficiency were increased to 83.16, 82.87, and 8.64%.
For zeolite, oxygen plasma to 60 seconds has the best performance on heavy metal removal. Adsorption capacity of a single heavy metal Cu, Pb, and Ni up to 0.85, 3.75, and 2.61μmol/g were obtained. Above results showed that adsorbents modified by plasma have a significant importment on heavy metal removal.

並列關鍵字

plasma modification ； adsorbent ； NaOH ； metal removal

參考文獻

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