| 利用新型稀土铈铁复合吸附剂去除水体腐殖质的研究 |
| 摘要点击 1088 全文点击 1732 投稿时间：2003-01-17 修订日期：2003-03-24 |
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| 中文关键词 富里酸 稀土材料 砷酸根 吸附剂 腐殖质 |
| 英文关键词 fulvic acid rare earth metal materials arsenate adsorbent humic substances |
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| 中文摘要 |
| 研究了稀土铈铁复合材料(CFA)对水体中黄腐酸(FA)的去除效能和作用机制.结果表明:CFA在平衡pH3.0～6.5的范围内对FA的去除效果较好,吸附速度快,120min即达到平衡.水体中FA与砷酸根在CFA上有很强的竞争作用,当FA加入量为5mg/L～10mg/L时,砷的饱和吸附量Qo即丧失40%～50%,表明两者作用于材料相同的活性位点.吸附前后的红外谱图(FTIR)揭示了CFA表面羟基在FA去除中起着重要作用.通过Zeta电位的测定得出材料的等电点为5.6,因而pH偏酸性的条件有利于FA的去除. |
| 英文摘要 |
| A rare earth metal inorganic adsorbent, cerium-iron adsorbent (CFA), was developed, and its performance for fulvic acid (FA) removal was evaluated. Experimental results show that rare earth metal adsorbent had a relatively high adsorption capacity and good kinetic property for FA ion under the pH range of 3.0～6.5, then the adsorption capacity decreased with the increase of pH. FA seriously inhibited the removal of arsenate, suggesting that the adsorption sites for As(V) and FA were similar. Fourier transform infrared (FTIR) spectra of CFA before and after FA adsorption demonstrated that M-OH groups plays an important role for FA removal. The pHicp is 5.6 through the measure of Zeta potential. |
