Efficient removal of organic dyes from aqueous solution by rapid adsorption onto polypyrrole–based composites
Efficient removal of organic dyes from aqueous solution by rapid adsorption onto polypyrrole–based composites
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DOI：
10.1016/j.jclepro.2017.08.196
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发表时间：
2017-11
影响因子：
11.1
通讯作者：
Jing Zhou;Qiu‐Feng Lü;Jia-Jia Luo-Jia
中科院分区：
文献类型：
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作者：
Jing Zhou;Qiu‐Feng Lü;Jia-Jia Luo-Jia
为了提高聚吡咯的吸附性能，利用两种廉价的可再生生物资源制备了新型聚吡咯基复合材料。以壳聚糖（CS）和木质素磺酸盐（LS）为分散剂，通过吡咯单体的原位聚合制备了聚吡咯-壳聚糖-木质素磺酸盐（PPY-CS-LS）、聚吡咯-壳聚糖（PPY-CS）和聚吡咯-木质素磺酸盐（PPY-LS）三种低成本的聚吡咯基复合材料。当吡咯与氧化剂的摩尔比为1：1，CS和/或LS的含量为10wt%时，得到了平均粒径分别为50 nm、73 nm和213 nm的PPY-CS-LS、PPY-CS和PPY-LS纳米粒子。研究了三种复合材料对六种染料的选择性吸附性能。结果表明，PPY-CS-LS和PPY-CS复合材料对酸性（阴离子）染料，尤其是刚果红（CR）具有较高的选择性;在30 ° C吸附温度下，当CR初始浓度为60 mg L − 1时，PPY-CS-LS和PPY-CS复合材料对CR的去除率分别达到99.3%和95.4%。CR的吸附平衡时间为30 min，比其他报道的PPY基吸附剂的吸附平衡时间快。结果表明，聚吡咯-CS-LS复合材料对染料具有良好的吸附性能，这是由于CS中的氨基/羟基官能团、LS中的磺酸基和聚吡咯链上的含氮官能团协同作用的结果。此外，吸附过程是可行的和自发的。因此，一个生产性的路线，以制造低成本的聚吡咯基复合纳米粒子具有可控的大小和高的染料吸附能力。
In order to improve the adsorption capacity of polypyrrole, two inexpensive and renewable biological resources containing abundant functional groups were used to achieve novel polypyrrole-based composites. Three low-cost polypyrrole-based composites, polypyrrole-chitosan-lignosulfonate (PPY-CS-LS), polypyrrole-chitosan (PPY-CS) and polypyrrole-lignosulfonate (PPY-LS) were prepared via an in-situ polymerization of pyrrole monomers with chitosan (CS) and/or lignosulfonate (LS) as dispersants. PPY-CS-LS, PPY-CS and PPY-LS nanoparticles with average diameters of 50 nm, 73 nm and 213 nm, respectively, were obtained with pyrrole/oxidant molar ratio of 1:1, and the contents of CS and/or LS of 10 wt%. Selective adsorption properties of the three composites for six dyes were investigated. Results showed that PPY-CS-LS and PPY-CS composites possessed much higher selectivity for acid (anion) dyes, especially for Congo red (CR); the removal efficiencies of PPY-CS-LS and PPY-CS composites for CR were up to 99.3% and 95.4%, respectively, when the initial concentration of CR was 60 mg L−1at the adsorption temperature of 30 °C. The adsorption equilibrium time for CR was 30 min, which was more rapid than those of other reported PPY-based adsorbents. The results suggested that the PPY-CS-LS composite exhibited a high adsorption performance for dyes because of the synergistic effects of amino/hydroxyl-containing functional groups from CS, sulfonic groups from LS, and nitrogen-containing functional groups from PPY chains. Furthermore, the adsorption processes were feasible and spontaneous. Therefore, a productive route to fabrication of low-cost PPY–based composite nanoparticles with controllable size and high dye adsorption ability was achieved.