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低温光聚合纸杯多孔材料及其对重金属吸附的研究
论文作者:童鞋论文网  论文来源:www.txlunwenw.com  发布时间:2019/10/29 7:52:11  

摘要:多孔材料作为一种较为理想的金属离子吸附材料开始受到越来越多的关注,相比于传统的吸附剂具有明显的优势,在于这种材料具有较大的孔隙率以及较为规整的孔隙结构,能够提供更有效的吸附以及较低的二次污染。但是多孔材料的缺点也较为明显,如缺乏充分的金属离子结合位点;在基体中的扩散限制问题,从而导致吸附速率以及可用容量的降低。因此,如何增加比表面积或者引入特定官能团来进一步提高其吸附效率变得尤为重要。

本文将带有强吸附基团的单体通过低温结晶光聚合相分离法,能够将单体一步制备出具有较强重金属离子吸附性能的多孔吸附材料,解决了其缺乏充分的金属离子结合位点的问题。本文主要内容如下:

1.以低温结晶光聚合诱导相分离法制备了2-丙烯酰氨基-2-甲基丙磺酸/聚乙二醇二丙烯酸酯(AMPS-PEGDA)聚合物多孔吸附材料。使用AMPS是因为其所含带的磺基对铜离子具有较强的吸附性能,而具有双官能团的PEGDA则作为交联剂参与反应。测试表明,所得材料具备多孔结构,且磺基已经通过聚合反应进入材料内。利用控制变量法,分别改变水溶液的pH值、吸附体系的温度以及两种单体的初始浓度,来研究其对材料吸附性能的影响。研究表明,在pH=6的条件下,多孔材料对Cu2+离子的吸附性能最佳;升高温度有利于吸附,材料在20℃时的平衡吸附容量为56.1mg/g,而在40℃时的平衡吸附容量为71mg/g;制备多孔吸附材料的最合适的PEGDA浓度是8wt%;AMPS浓度的提高有利于吸附性能的增强。从循环吸附实验可以看出,(AMPS-PEGDA)多孔材料经过4次循环吸附实验后,吸附效果仍能达到52%,证明其具有较好的循环利用性

2.利用低温结晶光聚合诱导相分离法以聚乙二醇二丙烯酸酯(PEGDA)为交联剂成功制备了顺丁烯二酸/亚甲基丁二酸(MA/IA)聚合物多孔吸附材料。分析其微观结构发现,当MA浓度为5%wt、IA浓度为10%wt时,PEGDA浓度变化对多孔材料的多孔结构的影响较小。不同的吸附参数,如溶液pH值、体系温度和反应物配比等,对材料吸附性能产生了较大的影响。材料最佳吸附pH值为6,且在相同pH值条件下,多孔材料对Pb2+具有更好的选择性。温度升高,多孔材料的吸附性能增强。当材料的制备参数为pH=6,温度=40℃,MA浓度=5wt%,IA浓度=10wt%,PEGDA浓度=5wt%时,对Pb2+的吸附量最大为106.4mg/g。从循环吸附实验可以看出,P(MA-IA)多孔材料经过5次循环吸附实验后,吸附效果仍能达到51%,证明其具有较好的循环利用性,在含重金属离子废水处理领域具有应用前景。

Porous material as an ideal metal ionadsorption material gets more and more attention, because the materials withhigh porosity and pore structure is regular, can provide more effectiveadsorption compared to the traditional adsorbent. But its disadvantages arealso obvious, such as lack of sufficient metal ion binding sites, diffusionlimitation in the matrix, resulting in reduction of adsorption rate andavailable capacity. Therefore, it is particularly important to increase theadsorption efficiency by increasing the surface area or introducing specificfunctional groups.

In this paper, t the porous adsorbents withstrong adsorpting properties of heavy metal ions were preparaed by lowtemperature crystallization phase separation photopolymerization from themonomers with strong adsorption groups, which solved the problem of lack ofsufficient metal ion binding sites, and could be one-step polymerization ofmonomers into porous materials. The main contents of this article are asfollows:

1.2-acryl amino-2-Methylpropane sulfonicacid/polyethylene glycol two acrylate (AMPS-PEGDA) polymer porous adsorptionmaterial was prepared by low temperature crystallization induced phaseseparation photopolymerization.The aim used of AMPS is due to the strongadsorption of copper ions by the sulfonate group contained in AMPS, while PEGDAwith bifunctional groups participates in the reaction as a cross-linkingagent.SEM,FT-IR and TGA were used for testing and characterization of theporous adsorption. The influence of pH value of aqueous solution,temperature ofadsorption system and initial concentration of two monomers on the adsorptionproperties of materials were studied by means of control variables.The studyshows that under the condition of pH=6,the adsorptioncapacity of porous materials for Cu2+ ions is the best.Increasing temperatureis favorable for adsorption.The equilibrium adsorption capacity of materialsat  20℃ is 56.1mg/g,while the equilibriumadsorption capacity is 71mg/g at 40℃.The most suitable PEGDA concentration forthe preparation of porous materials is 8wt%,and the increase of AMPSconcentration is beneficial to the enhancement of adsorption properties.It canbe seen from cyclic adsorption experiments that (AMPS-PEGDA) porous materialcan reach 52% after 4 cycles of adsorption experiments, which proves that ithas good recycling performance.

2.P (MA/IA/PEGDA) polymer porous adsorbentswere successfully prepared by using low temperature crystallinephotopolymerization to induce phase separation. The microstructure analysisshowed that when the concentration of MA was 5%wt and the concentration of IAwas 10%wt, the change of PEGDA concentration had little effect on the porousstructure of porous materials, and the pore size distribution was more uniform.The different adsorption parameters, such as solution pH value, system temperatureand monomer concentration, have a great influence on the adsorption propertiesof the materials. The optimum adsorption of pH value is 6, and the porousmaterial has better selectivity to Pb2+ under the same pH value. The adsorptionproperties of porous materials are enhanced by the increase of temperature.When the preparation parameters of the material are pH=6, temperature =40℃, MAconcentration =5wt%, IA concentration =10wt%, PEGDA concentration =5wt%, themaximum adsorption amount for Pb2+ is 106.4 mg/g. It can be seen from cyclicadsorption experiments that P (MA/IA) porous material can reach 51% after 5cycles of adsorption experiments, which proves that it has good recyclingperformance and has application prospect in the field of heavy metal ionwastewater treatment.

关键词:多孔材料;相分离;光聚合;吸附;重金属离子

Porous materials; photopolymerization;phase separation; adsorption; heavy metal ion

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