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首页> 外文期刊>Journal of Applied Polymer Science >Phosphorylated cellulose/electrospun chitosan nanofibers media for removal of heavy metals from aqueous solutions
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Phosphorylated cellulose/electrospun chitosan nanofibers media for removal of heavy metals from aqueous solutions

机译：磷酸化纤维素/电纺壳聚糖纳米纤维介质从水溶液中除去重金属

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摘要

Contamination of water resources by toxic heavy metals has significant impacts on environmental and human health. Their removal from aqueous media is essential to ensure water sustainability and to provide safe freshwater availability to population. Electrospun chitosan (CS) nonwoven mats are efficient at removing heavy metals from aqueous media. However, they suffer from low permeability and low-mechanical strength. They are also unable to remove contaminants in a nonselective way. A bilayer sorbent media made of a porous phosphorylated cellulose substrate covered by electrospun CS nanofibers was developed to overcome those weaknesses. The hydrophilic composite shows good water permeability and mechanical strength with appropriate thermal and chemical characteristics. Adsorption tests with Cd(II) indicate that pseudo-second order and Langmuir models best fitted experimental data, with a maximum adsorption capacity of 591 mg/g at 25 degrees C. Adsorption with multielement samples containing Cr(VI), Cu(II), Cd(II), and Pb(II) also reveal their capability to remove them in a selective way. This mechanically resistant, hydrophilic, and permeable adsorbent media was able to capture both cationic and anionic metallic contaminants.
机译：有毒重金属污染水资源对环境和人类健康有重大影响。将其从水介质中去除对于确保水的可持续性和为人口提供安全的淡水供应至关重要。静电纺壳聚糖（CS）非织造布垫能有效去除水介质中的重金属。然而，它们具有低渗透性和低机械强度。它们也无法以非选择性的方式去除污染物。为了克服这些缺点，开发了一种由多孔磷酸化纤维素基质制成的双层吸附介质，该基质由静电纺CS纳米纤维覆盖。亲水性复合材料具有良好的透水性和机械强度，并具有适当的热特性和化学特性。对Cd（II）的吸附试验表明，伪二级和Langmuir模型最符合实验数据，在25℃时的最大吸附容量为591 mg/g。对含有Cr（VI）、Cu（II）、Cd（II）和Pb（II）的多元素样品的吸附也显示了它们以选择性方式去除它们的能力。这种具有机械抗性、亲水性和渗透性的吸附剂介质能够捕获阳离子和阴离子金属污染物。

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