摘要
以价格低廉的葡萄糖为模板剂,合成了磁性介孔γ-Fe2O3,其比表面积为99.97 m2/g,平均孔容为0.25cm3/g,孔径为33 nm。采用批量平衡试验,研究了300 K下介孔γ-Fe2O3对Cr(Ⅵ)的吸附特性和介孔γ-Fe2O3的再生及Cr(Ⅵ)的回收。试验结果表明:pH为3.5时,介孔γ-Fe2O3对Cr(Ⅵ)的饱和吸附量达到44.56 mg/g。Freundlich方程比Langmuir方程更好地描述了介孔γ-Fe2O3吸附Cr(Ⅵ)的行为,表明此吸附是多分子层物理吸附。300 K下,用0.01 mol/L的NaOH处理吸附有Cr(Ⅵ)的介孔γ-Fe2O3,可以实现介孔γ-Fe2O3的很好再生。再生的γ-Fe2O3经过5次循环使用,仍具有很好的吸附能力。
Magnetic mesoporous γ-Fe2O3, having a specific surface area of 99.97 m2/g, average pore volume of 0.25 cm3/g and pore diameter of 33 nm,has been prepared in the presence of cheap glucose as a template. Using batch equilibration technique, the adsorption behavior of Cr （ VI ） onto mesoporous γ-Fe2O3, the regeneration of mesoporous γ-Fe2O3 and the recovery of Cr（ VI ） are studied at 300 K. The results indicate that saturation adsorption capacity of Cr（ VI ） onto mesoporous γ-Fe2O3 reaches 44.56 mg/g when pH is 3.5. Freundlich equation can describe the Cr（ VI ） adsorption behavior by magnetic mesoporous γ-Fe2O3 better than Langmuir equation does,indicating that it is multi- molecular layer physical adsorption. Moreover, the regeneration of mesoporous γ-Fe2O3 can be realized well by using NaOH （0.01 mol/L） for adsorbing Cr（VI ）-loaded mesoporous γ-Fe2O3. The regenerated γ-Fe2O3 still keeps its origi- nal adsorption capacity very well after being reused circularly for five times.
出处
《工业水处理》
CAS
CSCD
北大核心
2014年第1期15-17,21,共4页
Industrial Water Treatment
