Poly(N-isopropylacrylamide)-based microgels and their assemblies for organic-molecule removal from water.
Poly(N-isopropylacrylamide)-based microgels and their assemblies for organic-molecule removal from water.
复制标题
DOI：
10.1002/cphc.201200025
复制
发表时间：
2012-07
期刊：
影响因子：
--
通讯作者：
D. Parasuraman;Avijeet K. Sarker;M. Serpe
中科院分区：
文献类型：
--
作者：
D. Parasuraman;Avijeet K. Sarker;M. Serpe
我们回顾了我们最近利用聚（n -异丙基丙烯酰胺）-共丙烯酸（pNIPAm-co-AAc）微凝胶及其组装体从水溶液中去除偶氮染料分子4-（2-羟基-1-萘基偶氮）苯磺酸钠盐（橙II）的研究进展。首先，讨论了分散的单微凝胶在室温下从水溶液中去除橙II的能力。吸收效率（即从水中去除橙II的量）随着微凝胶中AAc成分的增加而增加，当AAc含量为10%时，pNIPAm微凝胶的最大吸收效率为29.5%。研究了微凝胶（聚集体）的去除效率，室温下的最大吸收效率为44.1%。在高温下，对微凝胶及其聚集体的去除效率进行了监测，未聚集的微凝胶的去除效率最高可达56.6%，而聚集体的去除效率为73.1%。为了进一步探讨微凝胶系统结构对功能的影响，我们研究了聚集体中微凝胶大小对吸收效率的影响。初步观察表明，由大直径微凝胶组成的聚集体比由小直径微凝胶组成的聚集体吸收效率更高。Langmuir吸附等温线与未聚集微凝胶和聚集微凝胶的脱染数据吻合，均表现出良好的拟合。
We review our recent efforts utilizing poly(N-isopropylacrylamide)-co-acrylic acid (pNIPAm-co-AAc) microgels and their assemblies for the removal of an azo-dye molecule, 4-(2-Hyrodxy-1-napthylazo) benzenesulfonic acid sodium salt (Orange II), from aqueous solutions. First, the ability of dispersed, single microgels to remove Orange II from aqueous solutions at room temperature is discussed. Uptake efficiency (i.e., the amount of Orange II removed from water) increased with AAc composition in the microgels, yielding a maximum uptake efficiency of 29.5% for pNIPAm microgels with 10% AAc. Assemblies of microgels (aggregates) were also investigated for their removal efficiency, which yielded a maximum uptake efficiency of 44.1% at room temperature. Removal efficiencies for the microgels and their aggregates were also monitored at elevated temperatures, and a maximum of 56.6% removal efficiency was achieved for unaggregated microgels, while aggregates were able to remove 73.1% Orange II. To further explore the impact of the microgel system's structure on function, we investigated the role microgel size in the aggregates plays on the uptake efficiency. Initial observations showed that the aggregates composed of microgels with large diameter yielded improved uptake efficiency over the aggregates composed of small diameter microgels. Langmuir sorption isotherms were fit to the data for the dye removal by the unaggregated and aggregated microgels, which showed good fits in all cases.