(沈陽工業(yè)大學(xué) 理學(xué)院，沈陽 110870)
摘 要: 膨潤土對重金屬離子等污染物具有良好的吸附性能，但吸附飽和后將成為危險固廢，處理變成棘手問題，研究其再生循環(huán)利用具有較大的經(jīng)濟價值，可為其高效利用提供了有力借鑒和參考。采用NaCl溶液為解吸液，以磁性膨潤土為吸附劑，探索Cr(Ⅵ)的解吸條件，并采用XRD、FTIR、BET和SEM表征再生前后樣品的結(jié)構(gòu)及形貌，研究材料的穩(wěn)定性。結(jié)果表明：磁性膨潤土具有良好的循環(huán)使用性能；經(jīng)過6次吸附-解吸后，磁性膨潤土仍保持穩(wěn)定結(jié)構(gòu)；其解吸過程符合準二級動力學(xué)與Langmuir等溫方程。
關(guān)鍵字: 磁性膨潤土；Cr(Ⅵ)離子；解吸再生
（School of Science, Shenyang University of Technology, Shenyang, 110870, China）
Abstract:Bentonite has good performance on adsorption of heavy metals and other pollutions. However, it become hazardous solid waste after saturation adsorption and its treatment is a difficult problem. The useful experiences and strong reference for its high effective utilization will be provided. It will take great scientific and economic value to study the regeneration recycling. Desorption regeneration of magnetic bentonite with NaCl desorption solution was studied after Cr(Ⅵ) was adsorbed onto it. The effects of desorption, such as pH and temperature, were explored. The physical or chemical feature of regenerated magnetic bentonite and the original were comparatively analyzed by XRD, FTIR, BET and SEM. The research results show that magnetic bentonite still remains stable structure after repeating six adsorption- desorption cycles. The desorption process better conforms to the second-order kinetic equation and the Langmuir model.
Key words: magnetic bentonite; Cr(Ⅵ) ions; desorption regeneration
