摘要:
本实验采用一锅法合成了沸石改性聚丙烯酰胺复合材料,并将其作为吸附剂,结合紫外-可见吸收光谱法,研究了其对诱惑红色素的吸附性能。探讨了溶液pH和振荡时间对吸附过程的影响,研究了吸附动力学、吸附等温线和吸附热力学,并对该复合材料进行了再生性能考察。结果表明:在溶液pH为6,诱惑红色素在振荡时间为80 min之内可达到吸附平衡,吸附过程符合拟二级动力学模型(R2=0.9984)和Langmuir等温吸附模型;当温度为20 ℃时,ΔG=(4.23 kJ/mol,ΔH=39.01 kJ/mol,ΔS=145.22 J/mol/K;吸附剂在再生使用3次内吸附性稳定。由此可知,沸石改性聚丙烯酰胺复合材料对吸附诱惑红色素具有良好的吸附性和再生性。
关键词:
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沸石
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聚丙烯酰胺
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吸附
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诱惑红色素
Abstract:
In the present work, the adsorption of allura red was studied with the zeolite modified polyacrylamide composite as the adsorbent combined with a UV-absorption spectrometry. Effects of sample pH and contact time on the adsorption rate were investigated. Kinetics, isotherms, and thermodynamics studies were conducted for the adsorption process. And the regeneration of adsorbent was carried out. The result showed that the adsorption equilibrium of allura red was reached after the contact time was 80 min at the sample pH of 6. The adsorption process of the zeolite modified polyacrylamide composite for allura red fitted the pseudo-second-order kinetic model (R2=0.9984) and Langmuir adsorption equation. When the temperature was 20℃, the changes of enthalpy (ΔH), entropy (ΔS), and Gibbs energy (ΔG) were 39.01 kJ/mol, 145.22 J/mol/K, and (4.23 kJ/mol, respectively. The adsorption capacity of allura red did not obviously changed after the regeneration of three times. The study proved that the zeolite modified polyacrylamide composite for allura red had good adsorbability and regeneration.
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