鐵改性海泡石除銻的影響因素研究
更(geng)新時間：2014-07-17 10:09
來源：環境工程學報
作者:
閱讀(du)：2135
| 中文摘要: |
| 選擇廉價海(hai)(hai)泡石(shi), 用氯化鐵(tie)對(dui)(dui)其改(gai)性。研究(jiu)鐵(tie)改(gai)性海(hai)(hai)泡石(shi)對(dui)(dui)銻的(de)吸(xi)附特性。結果表明(ming)，氯化鐵(tie)濃度(du)、吸(xi)附時間(jian)、初(chu)始(shi)(shi)銻濃度(du)以及溫(wen)度(du)等因素對(dui)(dui)銻的(de)吸(xi)附影響較(jiao)大，溶液初(chu)始(shi)(shi)pH影響不明(ming)顯(xian)。在初(chu)始(shi)(shi)銻濃度(du)50 mg/L，pH 6.8，5%氯化鐵(tie)改(gai)性海(hai)(hai)泡石(shi)投加量(liang)為2 g/L，吸(xi)附90 min, 溫(wen)度(du)35℃下，吸(xi)附量(liang)可達(da)21.6 mg/g。海(hai)(hai)泡石(shi)對(dui)(dui)吸(xi)附銻具有緩(huan)沖特性，溶液的(de)初(chu)始(shi)(shi)pH值在3.1～10.1范圍時，吸(xi)附后溶液的(de)最(zui)終pH值為8～8.5。IMS吸(xi)附銻是放熱(re)過程(cheng)。改(gai)性后海(hai)(hai)泡石(shi)比表面積(ji)增(zeng)大，表面羥基數量(liang)增(zeng)加，導(dao)致(zhi)其吸(xi)附能力增(zeng)強。通過XRD譜圖并未發現鐵(tie)晶體的(de)存(cun)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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