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首页> 外文会议>Air and Waste Management Association annual conference and exhibition >Restructuring of Waste Polystyrene as Ion Exchange Filters for Heavy Metal Removal
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Restructuring of Waste Polystyrene as Ion Exchange Filters for Heavy Metal Removal

机译：重组废聚苯乙烯作为离子交换过滤器以去除重金属

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This study is focused on the feasibility of recycling waste polystyrene to fabricate ion exchange filters. Mixtures of Tetrahydrofuran (THF) and Dimethylformamide (DMF) were tested as solvent to dissolve polystyrene samples. Polystyrene nonwoven fabrics were produced by electro-spinning. Polystyrene solutions were stored in a syringe with a stainless steel needle attached to the high voltage terminal of a power supply. A syringe pump was used to eject the solution into an electric field where droplets were spun into fine fibers. The fibers were collected on a grounded target electrode. The distance between the needle tip and collecting electrode was 4 cm with an applied voltage of 12 kV DC. The flow rate was 1.0 ml/hr. A scanning electron microscope (SEM) was used to characterize the morphology and diameter distribution of the fibers. The diameters of the electro-spun fibers were between 90 and 1200 nm. Following the electro-spinning, the nonwoven filtration materials were subjected to a process to attach sulfone groups to the surface of the fibers. After immersing in a 98% sulfuric acid for different times, the samples went through a sequence of rinsing in diluted solutions of 70%, 50%, 25% and 5% sulfuric acid. The process was catalyzed by silver ions. The final rinse was done in a batch of DI water. Fourier transform infrared spectroscopy (FTIR) was used to identify and quantify the -SO_3H groups on the filtration materials. Sulfone groups were attached to the benzene rings of polystyrene with a distinct bend at around 1030 cm~(-1). The ion exchange capacity (IEC) of the filtration materials is defined as the amount of hydrogen ions attached to the sulfone groups and is determined by acid-base titration. The IEC of the electro-spun waste polystyrene filtration materials were between 4.16 and 17.07 mmol/g. Finally, the filtration materials were tested with copper ions in an aqueous solution. Samples were soaked in an aqueous solution of copper sulfate. The change of Cu~(+2) concentrations were determined by atomic absorption spectrometry (AA). The IEC for copper ions were between 0.2 and 1.06 mg/g.
机译：这项研究的重点是回收废聚苯乙烯以制造离子交换过滤器的可行性。测试了四氢呋喃（THF）和二甲基甲酰胺（DMF）的混合物作为溶解聚苯乙烯样品的溶剂。聚苯乙烯非织造织物是通过静电纺丝生产的。聚苯乙烯溶液存储在注射器中，注射器的不锈钢针头连接到电源的高压端子上。使用注射泵将溶液喷射到电场中，在该电场中液滴被纺成细纤维。将纤维收集在接地的靶电极上。针尖与收集电极之间的距离为4 cm，施加的电压为12 kV DC。流速为1.0毫升/小时。使用扫描电子显微镜（SEM）表征纤维的形态和直径分布。电纺纤维的直径在90至1200nm之间。在电纺丝之后，对非织造过滤材料进行将砜基附接到纤维表面的过程。在98％的硫酸中浸泡了不同的时间后，样品在70％，50％，25％和5％硫酸的稀释溶液中进行了一系列冲洗。该过程由银离子催化。最后的冲洗是在一批去离子水中完成的。使用傅里叶变换红外光谱（FTIR）来鉴定和量化过滤材料上的-SO_3H基团。砜基团以约1030 cm〜（-1）的明显弯曲度连接到聚苯乙烯的苯环上。过滤材料的离子交换容量（IEC）定义为附着在砜基团上的氢离子的量，并通过酸碱滴定法确定。电纺废聚苯乙烯过滤材料的IEC在4.16和17.07 mmol / g之间。最后，在水溶液中用铜离子测试过滤材料。将样品浸泡在硫酸铜水溶液中。用原子吸收光谱法（AA）测定了Cu〜（+2）浓度的变化。铜离子的IEC在0.2和1.06 mg / g之间。

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