[1]张晓羽,郭红博,邹卫华.PEI改性沙柳对水中酸性铬兰K的吸附作用研究[J].郑州大学学报(工学版),2022,43(03):87-92.
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PEI改性沙柳对水中酸性铬兰K的吸附作用研究()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
43
期数:
2022年03期
页码:
87-92
栏目:
出版日期:
2022-04-10

文章信息/Info

Title:
Investigation into the Adsorption Mechanism of Acid Chrome Blue K in Aqueous Solution Using Polyethyleneimine Modified Salix
作者:
张晓羽郭红博邹卫华
文献标志码:
A
摘要:
以环氧氯丙烷为交联剂制备聚乙烯亚胺/沙柳(PEI-SP)吸附剂,研究其对水中阴离子染料酸性铬兰K(ACBK)的吸附行为,采用吸附动力学模型和吸附等温线模型对实验数据进行拟合分析。动力学模型拟合结果表明:PEI-SP对ACBK的吸附过程符合Elovich模型,该吸附过程为非均相化学吸附过程且膜扩散为吸附过程的主要速率控制步骤。等温线模型拟合结果表明:Koble-Corrigan模型能很好描述PEI-SP对ACBK的吸附过程,说明PEIl-SP对 ACBK的吸附主要以单分子层吸附为主,同时也存在多分子层吸附。在298 K时,根据Langmuir模型计算PEI-SP对ACBK的最大单分子层吸附量为0.428 mmol/g。通过pH值对吸附量的影响可以看出,随着pH值的增加PEI-SP对ACBK的吸附量逐渐降低。当 pH<6.78时,ACBK分子主要通过静电吸引作用吸附在PEI-SP表面。通过对吸附前后PEI-SP的红外光谱以及pH值对吸附性能的影响进行分析可知,PEI-SP对ACBK 的吸附机理为静电吸引作用、氢键以及示—w堆叠作用。解吸再生实验结果表明:吸附剂经过3次吸附/解吸附循环仍可维持吸附性能,显示出良好的再生性能,该吸附剂在处理阴离子染料废水方面具有良好的应用前景。
Abstract:
Abstract:Polyethylenimine/Salix ( PEI-SP) was prepared by epichlorohydrin crosslinking for application inthe adsorption of acid chrome blue K (ACBK) from aqueous solution. The adsorption kinetic models and theadlsorption isotherm models were used to fit the obtained experimental data,respectively. The results showedthat the kinetic process was best predicted by the Elovich model,which indicated the adsorption process wasan inhomogeneous chemisorption process and the adsorption rale was controlled by film diffusion.The equilib-rium isotherm was best fitted with the Koble-Corrigan model,which indicated that the adsorption of ACBK byPEI-SP was mainly monolayer adsorption,while accompanied by muli-molecular layer adsorption. The maxi-mum adsorption capacity of PEI-SP calculated by Langmuir model for ACBK was 0.428 mmol/ g at 298 K. Ascould be seen from the influence of pH value on the adsorption capacity , the adsorption capacity of PEl-SP onACBK gradually decreased with the increase of pH value. When pH<6.78,ACBK was mainly adsorbed onthe surlace of PEI-SP by electrostatic attraction.Combining the results of the infrared analysis and the effectsof pH values on the adsorption capacity ,the adsorption mechanism of ACBK on PEI-SP were electrostatic in-leraction,hydrogen bonding,and T—T stacking interactions. The results of desorption and regeneration ex-periments showed that the adsorbent could relain its adsorption capacity after three cycles operations,showingexcellent regenerability. It was implied that PE.I-SP has a promising application in the removal of anionic dyesfrom wastewater.
更新日期/Last Update: 2022-05-02