Facile and cost-effective preparation of PVA/modified calcium carbonate nanocomposites via ultrasonic irradiation: Application in adsorption of heavy metal and oxygen permeation property
Facile and cost-effective preparation of PVA/modified calcium carbonate nanocomposites via ultrasonic irradiation: Application in adsorption of heavy metal and oxygen permeation property
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DOI：
10.1016/j.ultsonch.2017.05.008
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发表时间：
2017-11-01
影响因子：
8.4
通讯作者：
Khadem, Elham
中科院分区：
文献类型：
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作者：
Mallakpour, Shadpour;Khadem, Elham
本工作的重点是制备和测定新的聚（乙烯醇）（PVA）纳米复合材料（NC）的物理化学行为的含有不同含量的碳酸钙（CC）纳米粒子改性与γ-氨丙基三乙氧基硅烷（ATS）（以下简称为CC-ATS），这可能是一个关键的处理，其应用作为气体阻隔O-2气体和吸收的金属离子在废水沃茨。在超声辐照下通过溶液浇铸法制备样品。还对所有超声合成的纳米复合材料的热性能和机械性能进行了评价，结果表明，通过在PVA中加入少量改性CC-ATS（最多5重量%），热稳定性和机械稳定性显著增强，并且更高的量对复合材料性能的影响较小。结果表明，在PVA基体中加入5wt%的CC-ATS后，PVA的氧气透过率降低了25.44%。实验结果表明，PVA NC对Cu（II）的吸附等温线比纯PVA吸附效率高，最大吸附容量为45.45mg·g ~（-1），符合Langmuir吸附模型。动力学研究表明，PVA/CC-ATS NC 5 wt%对Cu（II）的吸附符合准二级动力学模型。
This work is focused on the fabrication and determination of physicochemical behaviors of new poly(vinyl alcohol) (PVA) nanocomposites (NCs) containing various contents of calcium carbonate (CC) nanoparticles modified with gamma-aminopropyl triethoxy silane (ATS) (henceforth designated as CC-ATS) which could be a crucial treatment for their application as gas barrier to O-2 gas and uptake of metal ions in waste waters. Samples were produced through the solution casting method under ultrasound irradiation. Thermal and mechanical performances were also evaluated for all ultrasonically synthesized nanocomposites and the results indicated that thermal and mechanical stability are dramatically enhanced by addition of a small amount of modified CC-ATS within PVA up to 5 wt% and higher amounts has low effect on the composite properties. The result of oxygen gas permeability of PVA showed a 25.44% reduction by adding of 5 wt% of CC-ATS into polymer matrix. Experimental adsorption isotherm data indicated that PVA NC has more efficiency for Cu(II) adsorption relative to pure PVA and well simulated by Langmuir model with maximum adsorption capacity of 45.45 mg g(-1) Moreover, study of sorption kinetic indicated that the solute adsorption on PVA/CC-ATS NC 5 wt% was well modeled using the pseudo-second-order.