化工新型材料

化工新型材料 ›› 2023, Vol. 51 ›› Issue (2) : 202-206. DOI: 10.19817/j.cnki.issn1006-3536.2023.02.041

科学研究

玉米芯半纤维素基水凝胶对Pb²⁺吸附性能和机理

梁志

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Adsorption properties and mechanisms of corn cobs hemicelluloses-based hydrogels for Pb²⁺

Liang Zhi

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文章历史 +

Received		Published
2022-07-15		2023-02-20
Issue Date	Revised Date
2023-03-01	2022-07-15

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摘要

以玉米芯半纤维素(木聚糖)为原料,以丙烯酸(AA)、N-异丙基丙烯酰胺(NIPAm)为功能单体,N,N′-亚甲基双丙烯酰胺(MBA)为交联剂,在光引发剂安息香二甲醚(DMPA)紫外引发下,通过接枝聚合,制备水凝胶吸附剂,利用红外光谱(FT-IR)、扫描电镜(SEM)分析水凝胶吸附金属离子前后的结构,并研究pH、吸附剂用量、温度、金属离子初始浓度、吸附时间对Pb²⁺吸附性能的影响。结果表明:吸附平衡时间约为300min,对Pb²⁺的最大吸附容量为1095mg/g。水凝胶对金属离子的吸附为离子交换机制,吸附行为符合动力学准二级模型和Langmuir方程,半纤维素基水凝胶对重金属废水具有显著的吸附效果,可以作为重金属废水处理用的生物质吸附剂。

Abstract

Using Corn Cobs hemicellulose (xylan) as raw material,acrylic acid (AA) and N-isopropylacrylamide (NIPAm) as functional monomers,N,N′-methylenebis-acrylamide (MBA) as cross-linker and 2,2-dimethoxy-2-phenylacetophenone (DMPA) as photoinitiator,biomass hydrogel adsorbents were prepared by graft polymerization under UV irradiation.The chemical structures of hydrogels before and after the adsorption of metal ions were analyzed by FT-IR and SEM.The effects of pH,adsorbent dosage,temperature,initial concentration of metal ions,and adsorption time on adsorption capacities of Pb²⁺ were studied.The results showed that the adsorption equilibrium time was about 300 min,and the maximum adsorption capacity for Pb²⁺ was 1095mg/g.The adsorption process was an ion-exchange mechanism and the adsorption behavior was in accordance with the quasi-secondary kinetic model and Langmuir equation.The hemicellulose-based hydrogel had a significant adsorption performance for the Pb²⁺ and could be used as biomass adsorbent to treat the heavy metal ions wastewater.

关键词

水凝胶 / N-异丙基丙烯酰胺 / 丙烯酸 / 铅离子 / 生物质吸附剂

Key words

hydrogel / N-isopropylacrylamide / acrylic acid / Pb²⁺ / biomass adsorption

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玉米芯半纤维素基水凝胶对Pb²⁺吸附性能和机理[J]. 化工新型材料, 2023, 51(2): 202-206 DOI:10.19817/j.cnki.issn1006-3536.2023.02.041

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