| 標題: | Removal of As(V) and As(III) by reclaimed iron-oxide coated sands |
| 作者: | Jia-Chin Hsu
Chien-Jung Lin
Chih-Hsiang Liao
Shyi-Tien Chen |
| 貢獻者: | 環境工程與科學系
環境資源管理系 |
| 關鍵字: | Arsenate
Arsenite
Iron-oxide coated sand
pHzpc
Adsorption isotherm |
| 日期: | 2008-05 |
| 上傳時間: | 2009-10-05 14:12:50 (UTC+8) |
| 摘要: | This paper aims at the feasibility of arsenate and arsenite removal by reclaimed iron-oxide coated sands (IOCS). Batch experiments were performed to examine the adsorption isotherm and removal performance of arsenic systems by using the IOCS. The results show that the pHzpc of IOCS was about 7.0 ± 0.4, favoring the adsorption of As(V) of anion form onto the IOCS surface. As the adsorbent dosage and initial arsenic concentration were fixed, both the As(V) and As(III) removals decrease with increasing initial solution pH. Under the same initial solution pH and adsorbent dosage, the removal efficiencies of total arsenic (As(V) and As(III)) were in the order as follows: As(V) > As(V) + As(III) > As(III). Moreover, adsorption isotherms of As(V) and As(III) fit the Langmuir model satisfactorily for the four different initial pH conditions as well as for the studied range of initial arsenic concentrations. It is concluded that the reclaimed IOCS can be considered as a feasible and economical adsorbent for arsenic removal. |
| 關聯: | Journal of Hazardous Materials 153(1-2)：p.817-826 |
| 顯示於類別: | [環境工程與科學系(所)] 期刊論文
[環境資源管理系(所)] 期刊論文
|
