鐵改性海泡石除銻的影響因素研究
更新時間：2014-07-17 10:09
來源：環(huán)境工程學報
作者:
閱讀：1983
| 中文摘要: |
| 選擇廉價海泡石, 用氯化鐵對其改性。研究鐵改性海泡石對銻的吸附特性。結(jié)果表明，氯化鐵濃度、吸附時間、初始銻濃度以及溫度等因素對銻的吸附影響較大，溶液初始pH影響不明顯。在初始銻濃度50 mg/L，pH 6.8，5%氯化鐵改性海泡石投加量為2 g/L，吸附90 min, 溫度35℃下，吸附量可達21.6 mg/g。海泡石對吸附銻具有緩沖特性，溶液的初始pH值在3.1～10.1范圍時，吸附后溶液的最終pH值為8～8.5。IMS吸附銻是放熱過程。改性后海泡石比表面積增大，表面羥基數(shù)量增加，導致其吸附能力增強。通過XRD譜圖并未發(fā)現(xiàn)鐵晶體的存在。 |
| 英文摘要: |
| Inexpensive sepiolite was sampled and modified by FeCl3. Properties on biosorption of antimony by iron modified sepiolite were studied. It is shown that factors such as FeCl3 concentration, adsorption time, antimony initial concentration, temperature, etc. affect adsorption process significantly, and the effect of initial pH is not obvious. Antimony adsorption capacity is 21.6 mg/g while the adsorption conditions are as follows: antimony initial concentration 50 mg/L, pH 6.8, 5% FeCl3 concentration，immobilized bimass concentration 2 g/L, temperature 35℃, adsorption time 90 min. Sepiolite exhibits a strong buffering capacity, it takes a few minutes for a sepiolite suspension adjusted to pH 3.1～10.1 to attain its natural pH of 8～8.5. The process of adsorption produces heat. After modification the surface area of IMS increases obviously, and from the FTIR data we can find the surface –OH uptakes increases greatly too, which may be the reason for high adsorption capacity. The iron crystals are not found on IMS by XRD. |
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