Preparation and adsorption properties of porous double-network hydrogels modified by nitrilotriacetic acid anhydride

doi:10.16085/j.issn.1000-6613.2023-1138

Abstract

Abstract:

Nitrilotriacetic acid anhydride modified polyacrylamide/chitosan double network hydrogel was designed and synthesized, which had good mechanical properties, adsorption properties and a faster adsorption rate. The addition of sodium dodecyl sulfate was helpful to construct a porous structure of hydrogel, and the mechanical strength, swelling resistance and adsorption properties of hydrogel were enhanced by the use of nitrilotriacetic acid anhydride as crosslinking agent and modifier. Taking CrCl₃ as the model pollutant, the adsorption performance of CrCl₃ was investigated. The results showed that Langmuir isothermal adsorption model and pseudo-second-order kinetic model were more suitable for fitting the adsorption data of Cr³⁺ on hydrogels, indicating that the modified hydrogels had non-uniform surfaces and different binding sites. The maximum adsorption capacity of the modified hydrogel for Cr³⁺ was 570.6mg/g, and the adsorption effect was the best when pH was 4. After 5 sorption-desorption cycles, the removal rate of Cr³⁺ was 83.3%. The design of modified double network hydrogels provided good performance and development potential for the adsorption of heavy metal ions in wastewater.

Key words: nitrilotriacetic acid anhydride, double network, hydrogel, adsorption, modification

摘要：

设计并合成了氨基三乙酸酐改性的聚(丙烯酸-丙烯酰胺)/壳聚糖双网络水凝胶，其具有较好的力学性能、吸附性能及较快的吸附速率。十二烷基硫酸钠的加入有助于水凝胶构筑多孔结构，氨基三乙酸酐作为交联剂和改性剂，增强了水凝胶的机械强度、抗溶胀性能和吸附性能。以CrCl₃为模型污染物，考察其吸附性能。结果表明，Langmuir等温吸附模型和拟二阶动力学模型更适合拟合Cr³⁺在水凝胶上的吸附数据，说明改性水凝胶具有非均匀表面和不同结合位点。改性双网络水凝胶对Cr³⁺的最大吸附容量为570.6mg/g，在pH为4时吸附效果最佳。在经历5次吸附-解吸循环后，Cr³⁺的去除率为83.3%。改性双网状水凝胶的设计为废水中重金属离子的吸附提供了良好的性能和发展潜力。

关键词: 氨基三乙酸酐, 双网络, 水凝胶, 吸附, 改性

CLC Number:

TB34

ZHENG Yunxiang, GAO Yilun, LI Yanru, LIU Qinglin, ZHANG Haoteng, WANG Xiangpeng. Preparation and adsorption properties of porous double-network hydrogels modified by nitrilotriacetic acid anhydride[J]. Chemical Industry and Engineering Progress, 2024, 43(8): 4542-4549.

郑云香, 高艺伦, 李宴汝, 刘青霖, 张浩腾, 王向鹏. 氨基三乙酸酐改性多孔双网络水凝胶的制备及吸附性能[J]. 化工进展, 2024, 43(8): 4542-4549.

Figures/Tables 6

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水凝胶	Cr³⁺的最大吸附量 /mg·g^-1	循环吸附次数，去除率	参考文献
EDTA-HPAM-BPEI	340.6	5，85%	[17]
P(AA-AM)	154.8	—	[19]
PAA-CMCS	80.3	3，30.6%	[20]
EDTA-P(AA-AMPS)/SA	286.7	—	[21]
NTAA-P(AA-AM)/CTS	570.6	5，83.3%	本研究

水凝胶	Cr³⁺的最大吸附量 /mg·g^-1	循环吸附次数，去除率	参考文献
EDTA-HPAM-BPEI	340.6	5，85%	[17]
P(AA-AM)	154.8	—	[19]
PAA-CMCS	80.3	3，30.6%	[20]
EDTA-P(AA-AMPS)/SA	286.7	—	[21]
NTAA-P(AA-AM)/CTS	570.6	5，83.3%	本研究

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