Functional chitosan-stabilized nanoscale zero-valent iron used to remove acid fuchsine with the assistance of ultrasound
Functional chitosan-stabilized nanoscale zero-valent iron used to remove acid fuchsine with the assistance of ultrasound
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DOI：
10.1016/j.carbpol.2015.10.002
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发表时间：
2016-01-20
影响因子：
11.2
通讯作者：
Chen, Zuliang
中科院分区：
文献类型：
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作者：
Jin, Xiaoying;Zhuang, Zechao;Chen, Zuliang
制备了壳聚糖稳定的纳米级零价铁（CS-nZVI），并在超声辅助下用于去除水溶液中的酸性品红（AF）。使用CS-nZVI、老化CS-nZVI（暴露在空气中2个月）可去除98.9%以上的AF，而单独使用壳聚糖在超声辅助下15分钟的去除效率仅为14.6%。扫描电镜（SEM）证实壳聚糖聚合物呈同心圆层状排列。因此，该聚合物可以防止nZVI的聚集，提高其抗氧化能力。x射线衍射（XRD）结果表明，壳聚糖对nZVI纳米颗粒具有一定的保护作用。不同因素对CS-nZVI去除AF的影响表明，随着用量和温度的升高，还原性增加，但随着pH和初始浓度的升高，还原性降低。动力学研究表明，去除AF符合伪一阶模型。反应的表观活化能为55.34 kpmol，为化学控制反应。最后，CS-nZVI在印染废水中的应用使AF的去除率达到99%，而回用试验证实，经过7次循环后，AF的去除率从99.6%下降到39.3%。(c) 2015 Elsevier Ltd.版权所有。
Chitosan-stabilized nanoscale zero-valent iron (CS-nZVI) was prepared and used for the removal of acid fuchsine (AF) from aqueous solution with the assistance of ultrasound. More than 98.9% of AF was removed using CS-nZVI, aged CS-nZVI (exposed to air for 2 months), while only 14.6% removal efficiency was achieved after 15 min by chitosan alone with the assistance of ultrasound. Scanning electron microscopy (SEM) confirmed that chitosan polymers were arranged in a homocentric layered structure. Thus, the polymer can prevent the aggregation of nZVI and increase their anti-oxidation capacity. X-ray diffraction (XRD) also suggested that the chitosan used in synthesis may protect nZVI nanoparticles from air oxidation. Different factors impacting on the removal of AF using CS-nZVI showed that the reduction increased when dosage and temperature increased, but decreased when pH and initial concentration rose. Kinetic studies revealed that the removal of AF fitted well to the pseudo-first-order model. The apparent activation energy was 55.34 kpmol, indicating a chemically controlled reaction. Finally, the application of CS-nZVI in dyeing wastewater led to a removal efficiency of 99% of AF, while the reuse test confirmed that AF's removal efficiency declined from 99.6 to 39.3% after seven cycles. (c) 2015 Elsevier Ltd. All rights reserved.